Gas Metal Arc

Welding Machine

MANUAL
USER

USER MANUAL
Welding Method and Specifications

3
Phase

GMAW (MIG/MAG) 2 years limited spare part warranty

(Clamps and cables excluded)

Eczacıbaşı - Lincoln Electric recommend to use “ASKAYNAK” gas metal arc

welding wire for obtaining high performance from MasterMIG 420W.

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 AT - UYGUNLUK BEYANI
EU - DECLARATION of CONFORMITY
DECLARATION de CONFORMITE de l'EU
СЕРТИФИКАТ СООТВЕТСТВИЯ АТ

Şirket / Firm / Société

выдан Компании

KAYNAK TEKNİĞİ SANAYİ ve TİCARET A.Ş.

и свидетельствует о том, что

aşağıda modeli belirtilen kaynak makinesinin

declares that the welding machine
déclare que le poste de soudage
нижеуказанная модель сварочного аппарата
® ®
ASKAYNAK MasterMIG 420W
aşağıda belirtilen yönergelere uygun olduğunu
conforms to the following directives
est conformé aux directives suivantes
соответствует нижеуказанным положениям и

2004/108/EC, 2006/95/EC
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ve yine aşağıda belirtilen normlara uygun olarak tasarlandığını beyan eder.

and has been designed in compliance with the following standards.
et qu'il a été conçu en conformité avec les normes.
разработан в соответствии с нижеуказанными нормами.

TS EN 60974-1:2013, TS EN 60974-10:2009

Sertaç ÖZEN
Teknik Hizmetler Müdürü / Technical Sevices Manager
Directeur des Services Techniques / Менеджер по техническому обслуживанию

Tarih / Date / Date / Дата : 05.07.2015

CE sertifikası 2009 yılında eklenmiştir.

Kaynak Tekniği Sanayi ve Ticaret A.Ş.

TOSB Otomotiv Yan Sanayi İhtisas Organize Sanayi Bölgesi
2. Cadde, No: 5, Şekerpınar 41420 Çayırova, Kocaeli - TURKEY

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 Contents

Safety in Welding ................................................................................. 50 - 57

Electromagnetic Compliance ............................................................... 58 - 59
General Information ............................................................................. 60 - 61
Specifications ....................................................................................... 62 - 63
Preparations for Work .......................................................................... 64 - 67
Installation and Operation .................................................................... 68 - 70
Functions of Wire Feeder System................................................................. 71
Environment Conditions .............................................................................. 72
Storage and Transportation ........................................................................ 72
GMAW (MIG/MAG) Method ......................................................................... 73
Efficient Use of Machine In Terms of Energy Consumption............................ 74
Unpacking .................................................................................................... 74
De-commissioning the Welding Machine .................................................... 74
Maintenance and Troubleshooting ...................................................... 75 - 78
Failures in Welding Seams ................................................................... 79 - 80
Electrical Circuit Diagram ............................................................................ 81
Spare Parts .......................................................................................... 82 - 85
Warnings Label ........................................................................................... 85

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Wire Feeder and Power Unit Specifications ............................................... 86

USER

MANUFACTURER
Kaynak Tekniği Sanayi ve Ticaret A.Ş.
TOSB Otomotiv Yan Sanayi İhtisas Organize Sanayi Bölgesi
2. Cadde, No: 5, Şekerpınar 41420 Çayırova, KOCAELİ - TURKEY
Tel: (+90 262) 679 78 00 Fax: (+90 262) 679 77 00
www.askaynak.com.tr
Manufactured in People’s Republic of China by
KAYNAK TEKNİĞİ SANAYİ ve TİCARET A.Ş.

October 2015

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 Safety in Welding - 1

This Machines has been designed for GMAW (MIG/MAG). Shall not be used for any
other purpose.

Be sure that this machine should only operated by qualified personnel. Be sure that all
installation, operation, maintenance and repair procedures are performed only by authorized
personnel. Be sure to read user guide carefully before operating the machine. Failure to
follow the instructions included in the user guide may cause serious injury, loss of life and
damage on machine. Please read the warnings next to the symbols stated below. “Kaynak
Tekniği Sanayi ve Ticaret A.Ş.” is not liable for any damages due to improper connection,
storage conditions and operation procedures.

WARNING: This symbol indicates that the instructions within the user guide
must be followed to avoid potential serious personal injury, loss of life and
damages on machine. Protect yourself and other people.

READ AND UNDERSTAND THE INSTRUCTIONS CAREFULLY: Be sure to

read and understand the user guide before operating the machine. Failure
to follow the instructions stated in the user guide may cause serious injury,
loss of life and damage on equipment.
Do not weld while you are unattentive, unattentive, tired and sleepless.
Arc welding is a safe application when necessary measures are taken to
protect the welder against potential dangers. If these measures missed or
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disregarded, there may be dangers such as electric shock, exposing to high

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levels of fume and gas, arc radiation, fire and explode which may cause
serious injury or even death.
Note: For detailed information on safety in welding, please read ANSI Z49.1
standard.

Protective Equipments:
Welding operators should wear protective clothing to protect themselves
against burning risk. Welding burns is a frequent risk which may be caused
due to splash of welding sparks on bare skin.
Clothing used while welding may vary based on used welding method but
generally it should provide easy movements and should cover welder’s body
to protect against splashes, sparks and arc radiation.
Wooly clothing should be preferred due to its resistance against flame.
Synthetic clothing should not be worn since they will melt when exposed to
heat.
Protective clothing should be protected from grease and oil. This kind of
materials may flare and burn uncontrolledly in an environment with oxygen.
Shirtsleeves and trouser hems should not be folded. Since sparks and
melted metals may enter into these folds. Trousers should be kept outside
the work shoes and should not be inserted into it. Otherwise melted metals
and sparks may enter into shoe.

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 Safety in Welding - 2

Other protective clothing used in dangerous situations are stated below:

• Flame resistant clothing,
• Gaiters,
• Aprons,
• Leather cuff gloves and capes,
• Helmet used under the welding mask.

To protect hands against burns, cuts and scratches, gloves made from flame
resistant materials such as leather must be used. In addition, to provide
some insulation against electric shock, care should be taken that the gloves
made from flame resistant material are in good condition and dry.

Noise:
To protect ears against sparks and melted metals and to prevent hearing
impairment due to noise of arc welder, ear protectors should be used. When
the noise in working environment is reached to a level that disturbing the ears
and causing headache, auditory problem may occur. In such a condition
immediately use your ear protectors.
Hearing impairment may not be noticed until tested and then it may be too
late for treatment.

Importance and Cleanliness of Working Environment:

The tidiness and cleanliness of working environment is important as the
maintenance of welder. Even the level of potential damage rises up to
number of people in the environment. Although warnings related to machine
are read and necessary measures are taken, any of the personnel tripping

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over a cable may cause electric shock, contact to hot metal or falling risk for
himself, you and other people.
All equipment, cables, hoses and gas cylinders should be kept away from
busy places such as doors, aisles and stairs. Care should be taken for
the tidiness of the environment and when welding is completed working
environment should be cleaned. By this way, both work safety and working
efficiency will increase. Besides, other workers near the welding area may
step into weld pool by mistake, therefore safety guards should be placed
around the welding area during welding.

ELECTRIC SHOCK CAN KILL: Electric shock danger is the most serious
risk that operator may encounter frequently. Contacting electrically hot parts
may cause injuries, death or falling down due to electric shock and sudden
reflex. While machine is operating, do not touch to the electrode, ground
connection or live work piece connected to the machine. Insulate yourself
against electrode, grounding connection or work piece. Immediately after
plugging out the power cable, do not touch metal ends of power cable, there
may be electric shock danger.
Electric shock risk related to welding machine divides into two categories:
• Primary voltage shock (e.g. 230-460 V)
• Secondary voltage shock (e.g. 20-100 V)

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 Safety in Welding - 3

Primary electric shock is very dangerous since it is much higher than welding
voltage. When the power to the machine is open, you can encounter with
primary electric shock while your body is in contact with ground or touching a
live point within the machine. Please note that turning off the ON/OFF switch
located on the machine do not cut off the electric. To cut off the electric to
the machine it is necessary to disconnect the supply cable from connection
point or to shut down the fuse of incoming electric.
Never remove side covers of the machine and in case of failure have an
authorized technician to inspect and repair it.
Be sure to ground the machine and work piece.
While installing the machine and making ground connection, follow
general electric rules, all local laws and regulations and instructions of the
manufacturer company.
Do not use uninsulated cables and pliers, replace with the new ones. Never
dip the electrode in water for cooling.
Never simultaneously touch electrically “hot” parts of electrode holders
connected to two separate welders, because voltage between the two can
be the total of the open circuit voltage of both welders.
When working above floor level, use a safety belt to protect yourself from a
fall should you get a shock.
In semi-automatic or automatic welding, welding wire, electrode reel, welding
head, nozzle or torch are also electrically “hot”.
Always be sure the work cable makes a good electrical connection with the
metal being welded. The connection should be as close as possible to the
area being welded.
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While the welder is electrically hot, do not insert your hand or any other
object inside it.

WELDING ARC and ARC RAYS CAN BURN: Use a shield with proper filter
and cover plates to protect your eyes from sparks and the rays of the arc when
welding or observing open arc welding. Skin should be protected by clothing
made from flame resistance material. Protect other nearby personnel with
suitable, non-flammable screening and/or warn them not to watch welding arc
nor expose themselves to the arc rays or to hot spatter or metal.
When eyes are exposed to UV rays even for a short time, also called as
“Getting Welder’s Flash”, it may cause burns in your eyes. Getting Welder’s
Flash may not be noticed after hours of exposing, but it is too irritating as
well as may cause transient blindness. Normally getting welder’s flash is
a temporary situation, but exposing eyes to UV rays for a long time and
frequently may cause permanent damage on eyes. As a protection measure
besides not to watch arc rays, also using welding goggles having proper
filter is necessary.
As a rule, welding should start with a dark colored protective filter then should
continue with a lighter colored filter sufficient to see the area being welded
providing that not to fall under the minimum level. Welding masks protect
head, face, ears and neck against electric shock risk, heat, sparks and fire.

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 Safety in Welding - 4

GASES and FUMES CAN BE DANGEREOUS : When welding with electrodes

which require special ventilation such as stainless or hard facing or on lead
or cadmium plated steel and other metals or coatings which produce highly
toxic fumes, keep exposure as low as possible and keep the exposure level
under “Minimum Limit Values” using local exhaust or mechanical ventilation.
In confined spaces or in some circumstances, a respirator may be required
even outdoors. Additional precautions are also required when welding on
galvanized steel.
Do not weld in locations near chlorinated hydrocarbon vapors coming from
degreasing, cleaning or spraying operations. The heat and rays of the arc
can react with solvent vapors to form a highly toxic gas, and other irritating
products.
Welding may cause fumes and gases that are injurious to health. Always
enough ventilation should be used or fumes and gases should be exhausted
from breathing place.
Generally in welding applications; temporary effects for short time can be
seen such as face and skin burning, dizziness, nausea and fever based on
exposure period and amount of fume. Long time fume exposure may cause
iron loading and dysfunctions in lungs. Bronchitis and pulmonary fibrosis
are primary effects occurred.
Some electrodes may include alloys that entail special ventilation. Label of
these products that entails special ventilation should not be ignored and
“Product Safety Information Form” reports should be read carefully. When
welding on this kind of materials it may be necessary to use gas mask.
Keeping your head out of fume clouds is the easiest way for protection
against toxic fumes and gases.

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Avoid breathing these fumes and gases, air circulation or mechanical
ventilation equipments should be used and if the ventilation is not enough
gas mask should be used.

WELDING and CUTTING SPARKS CAN CAUSE FIRE OR EXPLOSION:

Where compressed gases are to be used at the job site, special precautions
should be used to prevent hazardous situations.
Do not heat, cut or weld tanks, drums or containers until the proper steps
have been taken to insure that such procedures will not cause flammable or
toxic vapors from substances inside. Tanks, drums or containers can cause
an explosion even though they have been cleaned. For information, read
“Recommended Safe Practices for the Preparation for Welding and Cutting
of Containers and Piping That Have Held Hazardous Substances”, AWS F4.1
from American Welding Society.
Connect work cable to the piece being welded as close as possible. Work
cables connected to the building framework or other locations away from the
welding area increase the possibility of the welding current passing through
lifting chains, crane cables or other alternate circuits. This can create fire
hazards or overheat lifting chains or cables until they fail.
Keep away fire hazards from welding area and have a fire extinguisher readily
available. Remember that welding sparks and hot materials from welding

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 Safety in Welding - 5

operation can easily go through small cracks and openings to adjacent

areas. Until ensuring that precautions are used to fully clean flammable and
toxic gases, never weld any tanks, drums, containers or material. Never
operate welder in places that flammable gases, vapors or liquid fuels exist.
Always keep in mind the fire risk due to high temperatures in arc welding.
Welding arc temperature may increase up to 5000 C°, but generally this
temperature is not the only fire reason. Fire risk may be occurred due to
sparks or melted metals splashed around. These metals may splash up to
ten meters away. Therefore keep inflammable materials away from welding
area. Also make sure that your work piece do not contact with any material
that may flare when heated. Material, that may flare with contact are divided
into three categories as liquids (fuel, oil, paint, thinner etc.), solids (wood,
cartoon, paper etc.) and gases (acetylene, hydrogen etc.).
Inspect the welding area. If there are systems operating with fuel or hydraulic
oil and if you cannot move welding area or system, place fire-resistant
protecting screen between them If you are working above floor level or on
stairway, make sure there is no flammable or explosive material below. Also
please remember that slag and sparks may splash on people around.
Special precautions should be used when welding in dusty environment.
Dust particles may burn and may cause sudden fire or explosion. If you
don’t have information about the inflammableness and fugacity of the dust
in the environment, do not start welding or cutting until it is inspected and
approved by expert and authorized person.
Before starting to the welding procedure, please check if there is any
flammable or self-ignition under heat coating on the surface of your work
piece.
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When you have a break in welding process, please make sure that the
electrode holder do not contact to the ground or work piece.
If you are welding within ten meters to the place where flammable materials
located, have a observor near you. This observer should watch where the
sparks and splashes go and should access easily to the fire extinguishers
when necessary. After welding process, please check if there is any fume
around for half an hour with the observer.
As in other emergency situations, first rule is not to panic in situations
where welding accidents happen. According to the size of the fire, to warn
the others activate the fire alarm, inform fire station, shut down the plasma
cutting machine and leave the building from fire exits as soon as possible.

FIRE DANGER MAY CAUSE ACCIDENTS : To prevent the risk for every
kind of arc glare and fire, never leave the welding torch on welding desk or
any surface in contact with work clamp.
Never refuel near to the welding arc or if there is any engine operating in
the surrounding area. Stop the engine and allow it to cool before refueling
to prevent spilled fuel from vaporizing on contact with hot engine parts and
igniting. While refilling the tank, do not spill fuel around.

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 Safety in Welding - 6

CYLINDER MAY EXPLODE IF DAMAGED : Use only compressed gas

cylinders containing the correct shielding gas for the process used and
properly operating regulators designed for the gas and pressure used.
All hoses, fittings, etc. should be suitable for the welding application and
maintained in good condition with a proper installation.
Always keep cylinders in an upright position securely chained to an
undercarriage or fixed support.
Carefully choose the locations of the cylinders:
• Cylinders should be kept away from areas where they may be struck or
subjectedto physical damage.
• Cylinders should be located to a safe distance from arc welding or cutting
operations and any other source of heat, sparks or flame.
Never allow the electrode, electrode holder or any other electrically “hot”
parts to touch a cylinder.
Keep your head and face away from the cylinder valve outlet when opening
the cylinder valve.
Valve protection caps should always be in place and hand tight except when
the cylinder is in use or connected for use (including the transportation of
the cylinder).

MOVING PARTS MAY HURT YOUR HANDS : Always keep all safety guards,
coverings and equipments in place and maintain in good condition. Always
keep your hands, hair, clothing and tools away from V-belt, gears, fans and
all other moving parts when starting, operating or repairing the equipment.

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In some cases, it may be necessary to remove safety guards to perform

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required maintenance. Remove the guards only when necessary and replace
them when the maintenance requiring their removal is complete. Always use
the greatest care when working near moving parts.
Never put your hands near to the cooling fan while it is operating.
To prevent accidentally starting gasoline engines while turning the engine
or welding generator during maintenance work, disconnect the spark plug
wires, distributor cap or magneto wire as appropriate.

FOR ELECTRICALLY POWERED EQUIPMENT : Turn off input power using

the disconnect switch at the fuse box before working on the equipment.
Install equipment in accordance with local codes in force.
GROUNDING : Power cables should be connected to a well grounded plug
for your safety and proper operation of the equipment.
Periodically inspect the conditions of electrode cables, supply cables and
cables connected to the equipment. If you notice any improper situation,
immediately replace damaged parts with the new ones. To prevent the
risk for every kind of arc glare and fire, never leave the electrode holder on
welding desk or any surface in contact with work clamp.

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 Safety in Welding - 7

WELDED HOT MATERIAL MAY CAUSE BURNS : High amounts of heat

may be produced from welding process. Hot surfaces and material may
cause serious burns. While touching or moving this kind of material, always
wear gloves.

ELECTRIC and MAGNETIC FIELDS MAY BE HAZARDOUS ON

HUMAN HEALTH : Electric current flowing through any conductor causes
electromagnetic fields. This electromagnetic field may interfere with
devices such as pacemaker. Welders having a pacemaker shall consult
their physician before operating this equipment. Exposure to electric and
magnetic fields may have other health effects which are not known yet (For
detailed information, refer to Page 58-59).

COMPLIANCE WITH CE NORMS: This machine has been manufactured in

compliance with the European Instructions.

SAFE OPERATION : This machine is suitable for welding in environments

where there is high electric shock risk.

Not to be used in residential locations where the electrical power is provided

by the public low-voltage supply system.
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EXTRA SAFETY MEASURES:

In some situations applying safety measures may be difficult, but even so follow the
mentioned rules. Keep your gloves dry, if getting wet is unavoidable then have an extra pair
of gloves near you. Stand on a plywood, plastic mat or similar dry and insulating material.
Insulate your body from welding piece.
If welding must be performed under electrically hazardous conditions such as in damp
locations or while wearing wet clothing, on metal structures such as floors, gratings or
scaffolds, when in cramped positions such as sitting, kneeling or lying, if there is a high
risk of unavoidable or accidental contact with the workpiece or ground, prefer to use the
following equipment :
• Semi-automatic DC constant voltage welders,
• DC manual arc welders,
• AC welders with reduced voltage control.
Conditions of electrode holder and cables are too important. Plastic or fiber insulating
material on holder prevents contact to electrically “hot” places. Before starting the welder,
always check the condition of the holder. Replace the old and worn ones, never attempt to
repair. Perform same checks for the cables, since the cost will be high to replace cables,
repair by using tubw with high insulation or similar. Always check the insulations before
every time you start the welder.

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 Safety in Welding - 8

If you feel an electric shock, always remember that this is a warning. In such case before
continue to work, check your machine, working routines and working environment against
electric shock. If there is an abnormal situation, never continue welding without using the
necessary precaution. If you cannot determine the source of problem, have an expert and
authorized person to check it.

PRECAUTIONS FOR OTHERS IN THE WORKING ENVIRONMENT:

Cleanliness and tidiness of working environment is extremely important for your safety as
well as other people in the environment. While other welders working or people walking
around the welding area may step onto your weld puddle by mistake or may cause you and
others to fall down by tripping over cables and electric shock risk. Also welding sparks may
cause burn danger by splashing on other people around.
Surrounding welding area with fire resistant screens reduces potential risks.
Also warn other people in the working environment for the use of work safety equipments.
Especially when they have to be in welding area, warn them to use fire and flame resistant
work safety clothing, welding goggles, welding mask, insulated work shoes and gloves.
Keep away any people who do not follow the instructions.
When working above floor level, use related warning signs to prevent splashing of melted
metals and welding sparks on people under working area.
Electromagnetic fields may be hazardous for pacemakers.
Make the necessary warnings and use warning signs for other people working or passing
around who are not related to welding work. Inform them that they have to contact with their
doctors before working in a welding environment.
In welding environments there is high electric shock risk. Other people may encounter
electric shock risk by tripping over cables while working. Do not use uninsulated welding

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cables, route cables through insulated, plastic channels if available.

INFORMATION ON RESIDUAL RISKS:

Askaynak MasterMIG 420W welder has been designed and manufactured in compliance
with safety rules required by TS EN 60974-1 standard. To eliminate the safety risks all
necessary precautions have been taken, precautions that need to be taken by operators
and users and all rules to be followed have been stated in the user manual. It is not possible
to eliminate the risks in cases that necessary care is not taken or safety measures are not
used. These risks may cause slight injuries but at the same time fire and explosion risks
may be fatal for more than one people. It is the user’s responsibility to assure the safety
of environment where the welding operation is performed, in cases that precautions are
not used or lacking, work must be stopped immediately and authorized people should be
informed.

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 Electromagnetic Compliance - 1

Designed according to TS EN 60974-1.

EMU Class of machine according to TS EN 55011 is Group 2 Class A.
For detailed information refer to TS EN 60974-10.

• While welding do not turn on/off the power switch. This situation may cause voltage
fluctuations in mains as well as shorten the economic life of the machine.
• After turning on the power unit, you should wait approximately for 5-10 seconds
for electrical stability of the machine and then start to welding procedure.
• This Class A equipment is not intended for use in residential locations where the
electrical power is provided by the public low-voltage supply system. There can be
potential difficulties in ensuring electromagnetic compatibility in those locations,
due to conducted as well as radiated radio-frequency disturbances.
The welding machine is designed according to the relevant norms and rules. However, it may
still cause problems for the telecommunication equipment (telephone, radio, television etc.)
and safety devices susceptible to the electromagnetic fields as it generates electromagnetic
waves. In order to reduce the effects of the electromagnetic waves (interference) generated
by the machine, please read the following carefully.
The Welding machine is designed for operating in industrial areas. If it is used in residential
areas, certain measures have to be taken in order to eliminate the possible effects of the
electromagnetic waves.
Installation and use
General : The user is responsible for installing and using the arc welding equipment
according to the manufacturer’s instructions. If electromagnetic disturbances are detected,
then it shall be the responsibility of the user of the arc welding equipment to resolve the
situation with the technical assistance of the manufacturer. In some cases this remedial
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action may be as simple as earthing the welding circuit (see note). In other cases, it could
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involve constructing an electromagnetic screen enclosing the welding power source and
the work complete with associated input filters. In all cases electromagnetic disturbances
shall be reduced to the point where they are no longer troublesome.
NOTE : The practice for earthing the welding circuit is dependent on local safety regulations.
Changing the earthing arrangements to improve EMC can affect the risk of injury or
equipment damage. Further guidance is given in IEC 60974-9.
Assessment of area : Before installing arc welding equipment the user shall make an
assessment of potential electromagnetic problems in the surrounding area. The following
shall be taken into account:
a) other supply cables, control cables, signalling and telephone cables, above, below and
adjacent to the arc welding equipment;
b) radio and television transmitters and receivers;
c) computer and other control equipment;
d) safety critical equipment, for example guarding of industrial equipment;
e) the health of the people around, for example the use of pacemakers and hearing aids;
f) equipment used for calibration or measurement;
g) the immunity of other equipment in the environment. The user shall ensure that other
equipment being used in the environment is compatible. This may require additional
protection measures;
h) the time of day that welding or other activities are to be carried out.
The size of the surrounding area to be considered will depend on the structure of the

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 Electromagnetic Compliance - 2

building and other activities that are taking place. The surrounding area may extend beyond
the boundaries of the premises.
Assessment of welding installation
In addition to the assessment of the area, the assessment of arc welding installations may be
used to evaluate and resolve cases of interference. An emission assessment should includ
in situ measurements as specified in Clause 10 of CISPR 11:2009. In situ measurements
may also be used to confirm the efficiency of mitigation measures.
Mitigation measures
Public supply system : Arc welding equipment should be connected to the public supply
system according to the manufacturer’s recommendations. If interference occurs, it may
be necessary to take additional precautions such as filtering of the public supply system.
Consideration should be given to shielding the supply cable of permanently installed arc
welding equipment, in metallic conduit or equivalent. Shielding should be electrically
continuous throughout its length. The shielding should be connected to the welding power
source so that good electrical contact is maintained between the conduit and the welding
power source enclosure.
Maintenance of the arc welding equipment : The arc welding equipment should be
routinely maintained according to the manufacturer’s recommendations. All access and
service doors and covers should be closed and properly fastened when the arc welding
equipment is in operation. The arc welding equipment should not be modified in any way,
except for those changes and adjustments covered in the manufacturer’s instructions. In
particular, the spark gaps of arc striking and stabilising devices should be adjusted and
maintained according to the manufacturer’s recommendations.
Welding cables : The welding cables should be kept as short as possible and should be
positioned close together, running at or close to the floor level.
Equipotential bonding : Bonding of all metallic objects in the surrounding area should be

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considered. However, metallic objects bonded to the work piece will increase the risk that

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the operator could receive an electric shock by touching these metallic objects and the
electrode at the same time. The operator should be insulated from all such bonded metallic
objects.
Earthing of the workpiece : Where the workpiece is not bonded to earth for electrical safety,
nor connected to earth because of its size and position, for example, ship’s hull or building
steelwork, a connection bonding the workpiece to earth may reduce emissions in some, but
not all instances. Care should be taken to prevent the earthing of the workpiece increasing
the risk of injury to users or damage to other electrical equipment. Where necessary,
the connection of the workpiece to earth should be made by a direct connection to the
workpiece, but in some countries where direct connection is not permitted, the bonding
should be achieved by suitable capacitance, selected according to national regulations.
Screening and shielding : Selective screening and shielding of other cables and equipment
in the surrounding area may alleviate problems of interference. Screening of the entire
welding area may be considered for special applications.

To achieve respectively harmonic current emissions and voltage fluctuations and flicker
limits according to TS EN 61000-3-12 and TS EN 61000-3-11 standards, recommended
mains supply’s minimum short circuit power should be 3.2 MVA and maximum impedance
should be 0.14 Ω.

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 General Information - 1

Warning!
Read entire section before installing and starting the machine.
• Do not install, operate or repair the welder without reading safety precautions included in
user manual. Keep this user manual and place to an easy accessible place.
• After completing the work or if you will discontinue working for a long time, disconnect the
mains supply.
• Do not insert any object into the welder. While the welder is operating, especially do not
touch to the moving parts with your fingers.
• Do not perform any modification on the machine. This may affect the machine features
and cause change in technical values.
• It is forbidden to perform any modifications and adaptations on the machine. Performing
any modifications and adaptations, not only cause losing guarantee rights but also may
endanger the usage safety of the machine and may cause electric shock for the users.
• Always ground the welder before operating. Various welders or other electrical devices
should be connected in series if they are using the same grounding line, all machines
or devices should be connected in parallel to each other. Cross sectional area of the
grounding cable of the welder should not be less than the cross sectional area of the
cable in the mains input.
• While welding, do not change the position of “Welding Voltage Selection Switch”.
• Welder should be used in places with good environment lighting and should not be used
in dark places. Also the plasma cutting machine has been designed to be used indoors
and is not suitable for using under sunlight, rain and snow. Welder cannot be used for
pipe melting works.
MANUAL

• Welder has been designed to be used indoors and is not suitable for using under sunlight,
USER

rain and snow.

• Misuse or welding machine damages due to user mistake voids the guarantee rights.
• Do not step on torch cable and do not keep the folding angle of the cable too narrow.
• Accepted ambient temperature while operating is between –10°C and +40°C.
• Accepted ambient temperature while transporting and storing is between –20°C and
+55°C.
• Allowable relative humidity rate is up to 90% at 20°C and up to 50% at 40°C.
• Heating tests have been performed in ambient temperature and operation cycle has been
determined with simulation at 40°C.
• Operate the machine in a well ventilated environment and leave at least 50 cm free space
around it. Do not operate in places higher than 100 m.
• To achieve a stabile arc when operating in a windy place, take precaution against wind.
Wind speed should be less than 1m/sec. If the wind speed is higher than this, use protective
screens.
• Manufacturer company reserves its right to change specifications without notice.
• For long economical life and safety operation, it is useful to take some simple precautions
stated below:

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 General Information - 2

• Do not place the machine on a surface with a slope over 15° and do not operate on such
surface.
• Machine should always be operated in an environment having clean airflow and there
should be no obstacle that prevents ventilation or stops airflow. Do not cover the machine
while operating with paper, cloth or similar objects.
• While welding, make sure that the cover of the wire drive unit is closed.
• Dust and dirt may enter into machine. This should be reduced as much as possible. Do
not operate the machine in extremely dusty locations and environments having water,
paint and oil particles and also grinding dusts and abrasive gases in its atmosphere.
• This machine has IP21S protection. Keep the machine dry as much as possible and do
not place it on wet ground or in puddles.
• Place the machine far away from radio controlled devices. Normal operation of the
machine may interfere with this kind of devices nearby and in such case may cause injury
or failure of the equipment. Please read “Electromagnetic Compatibility” section included
in this manual.
• If the frame cover is opened and interfered by people who are not qualified for electrical
equipments, life-threatening danger may occur. In case behaving on the contrary, be
regarded as accepting beforehand all potential negative consequences.

MANUAL
USER

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 Specifications - 1

• MasterMIG 420W, is a compact type gas metal arc (MIG/MAG) welding machine with
combined wire feeder unit and power unit.
• Especially suitable for spot welding and high quality welding of mild structural steels and
stainless steels with medium thickness used in metal manufacturing industry.
• It enables welding without splashing problem with carbon dioxide (CO2) gas.
• It has 30 steps (3x10) welding voltage setting. By this way it is possible to precisely set the
welding parameters.
• Wire feed speed can be set.
• It has slow wire feed (soft start) feature that facilitates arc creating.
• It has been equipped with thermal protection circuit against overheating load.
• It is water-cooled.
• It is safe and user friendly.
• It protection class is IP21S.
• It has been designed according to IEC 60974-1.
• EMU Class of machine according to TS EN 55011 is Group 2 Class A.
• Guarantee period is 2 (two) years (excluding torch and cables).Manufacturer company
reserves its right to change specifications without notice.
Operation Cycle and Overheating :
• Operation efficiency is the percentage rate of welder’s welding ability at given welding
current for 10 minutes without any brake and without overheating.
• Machine is protected against overheating thanks to its thermal protection. Warning lamp
on the front panel lights on when this protection is activated. Lamp turns off when returned
to the safe operation temperature and welding operation can continue.
MANUAL
USER

Electric Supply Requirement :

• It has been designed for 380 V ± 10, 50/60 % three-phase mains.
• Deviation ration between phases should not be higher than 5%.
• Frequency yield deviation should not be higher than ±1%.
Physical life determined by Ministry of Industry and Trade is 10 years.
(This is the period for providing spare parts required for the machine to operate.)

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 Specifications - 2

Input

Input Voltage Power Consumption Frequency

380 V ± 10 / 3 Phase 21 kVA (25% operation cycle) 50/60 Hertz (Hz)

Current Taken
Power Factor (Cos j) (min.) Output (min.)
From Mains
0.94 73 %
32.0 A (25 %)

Welding Current Output Rates

Duty Cycle Output Current Output Voltage
(10 minutes period) (Amper) (Volt)
25 % 420 A 35.0 V (DC)
60 % 325 A 30.3 V (DC)
100 % 255 A 26.8 V (DC)
Output Range
Welding current setting range Welding voltage range
60 - 420 A 17 - 35 V

Open circuit voltage range Welding voltage steps

18.1 - 46 V 30 (3x10)

Supply Cable : 4 x 4 mm2

Radio noise level : W
Fuse value and type : 3 x 40 A (delayed)
Physical Dimensions
Weight (excl. cables)
Height Width Depth
(without coolant)

MANUAL
810 mm 600 mm 1030 mm

USER
154 kg
Ambient Operating Temperature : Between –10°C and +40°C

Insulation Class : F + H Protection Class : IP21S

Pollution degree : 3

Wire Drive Unit Model : MasterFeed MF-4

Wire speed setting before welding
Wire drive speed (un) range
(for arc start without splashing)
1- 24 m/dak
10 % - 100 % (un)
Wire Diameters

Steel wire (V type reels) Flux cored wire (V type notched reels) Aluminum wire (U type reels)
0.8 - 1.0 - 1.2 mm 1.2 - 1.6 mm 1.2 - 1.6 mm

Supply voltage and power of wire drive unit : 42 V, 90 W

Maximum supply current : 4 A
Physical Dimensions

Height Width Depth Weight (excl. cables)

440 mm 290 mm 675 mm 19 kg

Protection Class : IP21S

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 Preparation for Work - 1

Welding wire reel protection

cabinet cover Wire feeder unit handle

2/4 trigger selection switch

Gas flow without welding Wire feed control without

control switch welding button

Torch connector (EURO)

Wire feed speed setting button

Wheels

Water pump switch Power indicator

Digital welding
voltage indicator On-Off switch

termal koruma göstergesi

welding voltage
precise setting switch
Digital welding
welding voltage
current indicator
coarse setting switch

Work cable connection

MANUAL

WARNING ! socket (low inductance)

USER

While welding,
changing welding Work cable
voltage range may connection socket
cause damage to the (high inductance)
machine. Therefore
stop welding to
change the voltage
range.

Rear wheel

Front wheel

FRONT PANEL CONTROLS

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 Preparation for Work - 2

Wire feeder unit handle Welding wire reel

protection cabinet
Shielding gas inlet socket

Pin for placing wire

Control cable connection socket feeder unit to power unit

Coolant inlet and

Wire feeder unit (+) outlet sockets
power connection socket
Wire feeder unit
Cooling water rear wheels
connection fuse (3A)
Cooling water
level indicator
Wire feeder unit
fuse (5A)
Shielding gas
cylinder fixing slot
Shielding gas (CO2)
heater fuse (8A) Control cable
connection socket
Control unit Wire feeder unit (+)
fuse (4A) power connection socket

Mains inlet
energy cable Specification plate

MANUAL
USER
Rear wheel Front wheel

Rack for placing shielding

gas cylinder

BACK PANEL CONTROLS

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 USER
MANUAL

66
Wire feeder unit Wire feeder Wire feeder reel press
handle engine forced setting spindle

Welding wire reel protection

cabinet cover

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Cover providing easy
access to internal panel

Welding wire reel Wire feed speed without

connecting shaft and welding setting button
braking torque setting
burnback period setting
button

Welding torch
Welding wire reel
connection socket
protection cabinet

Water inlet and outlet

channels for connecting
torch cooling water when
required

CONTROLS IN WIRE FEEDER UNIT

Preparation for Work - 3

rear wheels

Pin slot for placing

wire feeder unit to Wire inlet Wire drive Wire outlet
power unit guide reels (4 unit) guide
 CARBON DIOXIDE
GAS HEATER (24V-55W)

GAS
REGULATOR

Shielding gas hose

Welding torch WIRE
cable FEEDER

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UNIT

TORCH
cable
cable
Control

unit power
connection
Wire feeder
POWER
Work piece UNIT

Work
GAS TUBE PROTECTOR

cable CO2 gas heater

connection

CONNECTION DIAGRAM
mains inlet
energy cable
Preparation for Work - 4

Place and secure the

shielding gas cylinder to
the platform

67
USER
MANUAL
 Installation and Operation - 1

Mains Supply
• Mains supply connection of the machine should be made as per rules and only by qualified
personnel trained with necessary information.
• Welding machine has been designed for triphase mains supply, 380 V± 10, 50/60% and
should be protected by 40A delay action fuse. Supply cable should be at least 4x4 mm2.
• Mains supply connection should be grounded.
• Before connecting the machine to mains, make sure that the machine is off.
• No mains plug is provided with the machine. Please select an appropriate plug for the
mains outlet to be used and connect the yellow-green cable in the mains cable to the
grounding terminal of the plug.
• Never perform a mains supply connection and start the machine until there is a good
protective ground connection approved by a qualified electrician. Electric leakages
constitute death risk for human health.
Shielding Gas Connection
To connect shielding gas below operations should be done :
• Secure the gas cylinder and protect against risks such as rollover.
• Remove the safety valve cover of gas cylinder and leave the cylinder valve open for a
while to clean it from foreign materials.
• Install the gas regulator on gas cylinder.
• Connect the gas hose to gas regulator.
• Connect the other end of gas hose to “Shielding Gas Inlet Socket” located in the rear of
welding machine.
• If necessary, connect the plug of heater to “Shielding Gas Heater Socket” (24 V) located
MANUAL

in the rear of welding machine.

USER

• When it is not used, close the valve of gas cylinder.

Welding Torch Connection
• Connect the welding torch to “Welding Torch Connector” (EURO Socket) located in
front of welding machine.
• Since the welding machine is water cooled, always fill the “Coolant Tank” with water
before starting the machine.
• By opening the “Coolant Tank Cover” located on the upper panel of power unit, fill the
“Coolant Tank” with 5 liters of water. Water level should be at “MAX” level. Check the
water level with “Coolant Level Indicator” located in the rear panel of power unit.
• Connect “BLUE” colored hose union located on the welding torch to “Torch Coolant
Inlet Socket” located in the front panel of wire feeder unit and connect “RED” colored
hose union to “Torch Coolant Outlet Socket”.
• In case there is no water circulation, welder does not operate and warning lamp start to
flash.
Connection Between Power Unit and Wire Feeder Unit
• The connection between the power unit and wire feeder unit is performed with “Control
Cable” (combined cable), “Wire Feeder Unit Connection Cable” and “Coolant Hose Kit”.
• Transmission of voltage and control signals from power unit to wire feeder unit is provided
with the connection of “Control Cable Connection Sockets” located in the rear of these
two units, to each other via “Control Cable”.
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 Installation and Operation - 2

• Welding current circuit made by the connection of “Wire Feeder Unit Power Connection
Sockets” located in the rear of power unit and wire feeder unit, to each other via “Wire
Feeder Unit Connection Cable”.
• To provide shielding gas to wire feeder system and welding torch, it is necessary to
connect “Shielding Gas Hose” to “Shielding Gas Inlet Socket” located in the rear of
welding machine. At the end of gas hose, there is a pipe connection.
• To provide the coolant flow which will be transmitted to the welding torch by passing from
power unit to wire feeder unit, it is necessary to connect the “Coolant Inlet and Outlet
Sockets” and the unions at the end of hosed located in the coolant hose kit as indicated
below.
a) Connect blue ended hose to “Coolant Inlet Connection Socket” along the connection
sockets located in the rear of wire feeder unit. Connect the other end of this hose to
“Coolant Outlet Connection Socket ” located in the rear of power unit.
b) Connect red ended hose to “Coolant Outlet Connection Socket” along the connection
sockets located in the rear of wire feeder unit. Connect the other end of this hose to
“Coolant Inlet Connection Socket ” located in the rear of power unit.
Installing Welding Wire
• According to the procedure stated in “Wire Feeder Unit Functions” section on Page 26,
select the welding torch mode by using “2/4 Trigger Selection Switch”.
• Place the “Wire Feed Speed Setting Button” located in the front panel of welding
machine to “O” position.
• Make sure that the torch equipment (spiral and nozzle) is suitable for the welding wire
being used and connect the welding torch to “Torch Connection Socket” located in the
front panel of wire feeder unit.
• After matching wire drive reels to each other which are suitable for the wire diameter and

MANUAL
wire type being used, connect the reels to wire feeder unit.

USER
Placing Welding Wire into Protective Cartridge
- Open the cover of “Welding Wire Reel Protection Cabinet” located in the rear of wire
feeder unit.
- Insert the welding wire reel to “Welding Wire Reel Connecting Rod” as the end of the
wire will be on the lower part of reel.
- If necessary, set the braking (tightening) torque of “Welding Wire Reel Connecting
Rod”. When the reel stops, it shouldn’t freely turn around the connection axis.
- Cut the twisted end of the wire by taking out from open part of protector and file the
sharp corners.
Installing Welding Wire to Wire Drive Unit
- Open the side cover of wire feeder unit.
- Release the “Wire Feed Reel Press Forced Setting Spindle” by loosening.
- Run the welding wire through the “Wire Inlet Guide” of wire feeder unit.
- Install the welding wire to “Wire Outlet Guide” by running through wire drive reels.
- After setting the press force by fixing again the “Wire Feed Reel Press Forced Setting
Spindle”, start the machine with “On/Off Switch” located in the front panel of power unit.
- Press the “Wire Feed Control Without Welding Button” located in the front panel of
wire feeder unit. During this action, always make sure that the contact nozzle of welding
torch is not in place. You can set the wire feed speed with “Wire Feed Speed Without

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 Installation and Operation - 3

Welding Setting Button” located within the wire feeder unit.

- Release “Wire Feed Without Welding Control Button” after the welding wire is seen
and install the contact nozzle and gas nozzle to the welding torch and tighten properly.
Adjusting Press Force of Wire Drive Reel
- Properly set the press force of reels. If the press force is too low, wire slips on reels; if
the press force is too high, reels crushes the wire or wire jams in. Press force increases
when driver reel press force setting turned clockwise, when turned counter clockwise
press force decreases.
Setting Braking Torque of Welding Wire Reel Connecting Shaft
- To prevent welding wire to discharge from the reel, fastener that holds the reel is equipped
with a braking system.
- Braking setting is performed with a spring located in the fastener.
- When springs tightened to the left, braking torque increases, when tightened to the
right, braking torque decreases.
Type and Selection of Wire Drive Reels
- Wire drive system is equipped with “V” type reels set for Ø 0.8, 1.0 and 1.2 mm welding wire.
- Make sure that the diameter of installed reel is suitable for the diameter of welding wire
being used.
- There is a mark on the side surface of reels indicating the profile of wire drive groove
suitable for the wire diameter to be used. This mark is not seen after the installation.
- For steel and stainless steel welding wires “V” type reels should be used.
- For aluminium wires “U” type reels should be used.
- For flux cored “Notched-V” type reels should be used.
MANUAL
USER

Changing Wire Drive Reels

To change the reels :
- Release the press force setting of feeder reels.
- Remove the reel desired to be changed.
- Install the new reel making sure that it fits into its place.
- Fix pressure force setting again.

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 Functions of Wire Feeder Unit

Wire drive system has the following functions :

Welding Torch Operation Modes :
• 2 Trigger Mode (manual): Welding procedure is started by pressing and holding down
the trigger on the welding torch. When trigger released welding stops.
• 4 Trigger Mode (automatic operation): Welding procedure is started by pressing once
the trigger on the welding torch. When pressed second time, welding stops.
Wire Feeding Speed Setting :
• It is possible to set the wire feeder speed between 1-24 m/min
Test functions :
• Wire Feed Without Welding: With this button, only wire feeder unit is started without
starting power unit and gas solenoid. This feature is used while driving the welding wire
to welding torch.
• Gas Flow Without Welding: With this button, only the gas solenoid may be turned on
and off without starting the power unit. This feature is used for controlling the gas flow
speed and gas connections.
Soft Start :
Approach Speed Setting of Welding Wire End to Workpiece Before Welding:
• This feature is used for fixing the approach speed of welding wire to the workpiece at the
time of welding start. Also with this button wire feed speed without welding can be set.
Setting range is between 10% and 100% of wire feed speed.
Burnback Control (0.02 - 0.25 sec):
• This feature enables proper length for the welding wire exits from the contact nozzle at

MANUAL
the time of welding procedure ends and not sticking to contact nozzle or workpiece after

USER
welding.

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 Environment Conditions

Warning !
Before starting the machine following procedures should be performed :
• Provide the necessary environment conditions for the welding machine. For example
there shouldn’t be any flammable gases and vapors, conducting dusts, burner/flammable
fumes and other factors that may be hazardous for insulation and mechanical structure of
the machine.
• Welder has been designed to be used indoors and is not suitable for using under sunlight,
rain and snow.
• Welding machine should be located to a place where can be seen at all times.
• In case of overheating, fume or flame, smell of insulation burn, extreme shocks or extreme
noise, machine should be turned of, mains supply should be disconnected and qualified
electric technician or “Qualified Technical Service” should be contacted immediately.
• When current circuit is locked or electric voltage is determined on the body, procedure
indicated in the fourth article should be performed.
• Also in case of mechanical damage such as machine falls down from a high place, again
procedure indicated in the fourth article.
• Extremely damp environment may cause damage to the insulation of the machine and
electric shock danger.
• While operating some internal parts of the machine may get heated and temperature may
increase up to 100°C. This is normal and machine is protected against overheating with
“Thermal Protection Circuit”.
• Do not allow extremely high temperatures in cable connection points. If connections
overheated, this is the sign that they are not available to continue working. Parts composing
the connection should be checked and damaged ones should be replaced immediately.
MANUAL
USER

Storage and Transportation

Welding machine should be stored at confined rooms having temperature between –20°C
and +55°C and at most 90% relative humidty rate at 20°C.
Room should be free from flammable, conductive dust or other similar items.
Preferably welding machine should be stored in its package.
Transportation inside the facility should be done by using its own frame or as an option a
crane or overhead travelling crane should be used.
In far distance transportations, welding machine should be packaged to be protected
against mechanical damages.
If the welding machine will be kept or not to be used for a long time before operating the
machine, it should be cleaned and placed into its box and should be stored in environment
without damp and dust.

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 GMAW (MIG/MAG) Method

• Make sure that the welding machine is installed according to the explanations included on
Page 68-70.
• By considering the desired welding current values, install the work cable to the “Work
Cable Connector” located in front of the welding machine by using the fitting screw at
the end of work cable.
Note:
Inductance is a mechanism that stabilizes the welding current and used for minimizing the
splashings in the welding seam. It is recommended to use low value inductance outlet ( ) for
welding current up to 250 amperes and to use high value inductance outlet ( ) for welding
current higher than 250 amperes.
• Connect the work cable holder to the clean surface of the workpiece to be worked on.
Make sure that the contact between them is as good as possible.
• Start the machine by turning the “On/Off Switch” located in the front panel of the welding
machine to “I” position. “Power Indicator” will light up.
• Welding voltage value is approximately set with “Welding Voltage Coarse Setting
Switch” and precisely set with “Welding Voltage Precise Setting Switch” (Refer to the
picture on Page 64). These switches are located in the front panel of welding machine.
Warning !
While welding do not change the welding voltage! This may cause serious damage on
the machine.
• Switch on the water pump switch, in front of the front panel. Water pump will operate.
• Value of welding current directly depends on the wire feeding speed value. Choose proper
wire feeding speed with “Wire Feed Speed Setting Button” located in the front panel of
MasterFeed MF-4 wire drive unit. Wire drive speed can be set between 1-24 m/min.

MANUAL
• You can start welding procedure by following related rules.

USER

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 Efficient Use of Machine In Terms of Energy Consumption

Part Wire Wire Guide Welding Welding Gas

Thickness Diameter Inner Diameter Current Voltage Flow Speed
(mm) (mm) (mm) (A) (V) (lt/min)
0.8 - 1.5 ø 0.8 ø 1.4 50 - 90 17 - 18 6
* 1.0 - 2.5 ø 0.8 ø 1.4 60 - 100 18 - 19 7
2.5 - 4.0 ø 0.8 ø 1.4 100 - 140 21 - 24 8
* 2-5 ø 1.0 ø 1.6 70 - 120 19 - 21 9
5 - 10 ø 1.0 ø 1.6 120 - 170 23 - 26 10
* 5-8 ø 1.2 ø 1.6 110 - 180 22 - 24 10
8 - 12 ø 1.2 ø 1.6 160 - 300 25 - 38 12
* 10 - 16 ø 1.6 ø 2.0 140 - 180 22 - 24 15
> 16 ø 1.6 ø 2.0 180 - 400 34 - 40 18

* Marked ones are short circuit arc (short arc) transfer and others are drop arc (long arc) transfer.

Welding machine is designed and manufactured as to get low energy from mains while in
the On position.
While welding to prevent over energy consumption, current values that are suitable for the
used welding wire diameter should be used and current values higher than adequate should
be avoided.

Unpacking
MANUAL
USER

ASKAYNAK MasterMIG 420W Gas Metal Arc Welding Machine sold in its original cartoon
box and on a pallet. Do not purchase the machines without packaging. To unpack the
machine, cut the strap connected to the pallet and lift up the box.
Do not dispose of the box and keep it for future transporting and storing.

De-commissioning the Welding Machine

When the economical life of the machine expired and cannot operate should not
be disposed as domestic waste and not thrown into waste. Welding machine
should be disposed of as per local regulations.

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 Maintenance and Troubleshooting - 1

Warning !
Proper usage and performing periodical maintenance fully will enable high performance and
important for long economical life. Maintenance, repair and service works should only performed
by the qualified personnel who had the required training!
Mains current of the welding machine should be disconnected and power cable should be
unplugged while performing maintenance and service.

DAILY MAINTENANCE
Follow general personal safety and fire safety rules related to the welding procedures.
Clean metal splashings from gas nozzle. These may cause weakness in shielding gas flow
that covers molten welding metal.
Clean the gas nozzle at the end of welding torch against splashing with GMAW spray. For this
procedure you can use our “Focusweld” welding spray. Never attempt to clean accumulated
burrs by hitting the end of torch to a hard surface.
If you notice any wear and crush on welding wire, check if the press force of wire drive reels
is suitable for the wire diameter and if you notice over pressure, decrease the press force
setting as appropriate.
If wire drive reels are worn or damaged, you cannot achieve a smooth wire feed. Frequently
check the reels and if there is any wear replace with the new ones.
Before installing a new welding wire reel, remove the gas nozzle and contact nozzle and clean
the spiral with compressed air. This procedure will prevent the sticking of the wire.
Check the welding torch and clean if necessary.
Make sure that the welding current adjusting knob located in front panel and On/Off switch
located in rear panel are in place and properly operating. If current adjusting knob is not

MANUAL
installed properly and if On/Off switch is not exactly in place and is not operating smoothly,

USER
contact with the service.
Check if there is vibration, whistle or abnormal smell after starting the machine. If there is
any problem try to find the source of the problem, if there is a problem due to environment
eliminate this factor, if the problem source is the machine do not interfere and contact with the
service after disconnecting from the mains.
Make sure that the welding current is compatible with set current value. If there is any
difference, perform the necessary adjustment since it will affect the welding operation.
Make sure that the cooling fan is not damaged and turns normally. If the fan doesn’t operate
even after the overheating of the machine, check if the propeller of the fan is blocked. If the
fan is damaged, contact with authorized service.
Check if the welding connections are loose or overheated. If there is overheating or loosening,
tighten the connections or contact with authorized service.
Check if the current cable is damaged. If it is damaged, insulate the damaged part by wrapping
with a suitable material or change the cable with the new one.

MONTHLY MAINTENANCE
By using dry air compressor clean the internal part of the machine to remove accumulated
dusts. To protect small parts, be careful about the air pressure used in cleaning.
Check the screws on the machine and if they are loosen, tighten. If there is missing screw,
always install a new one. Replace rusted screws with the new ones.
Check the conditions of all electric connections and tighten loosed connections when
necessary.

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 Maintenance and Troubleshooting - 2

YEARLY MAINTENANCE
Contact to authorized service for yearly maintenance. Grounding continuity and insulations
test must be applied during yearly maintenance. Check if this tests has been done from the
yearly maintenance report.

PROBLEM REASON SOLUTION

Spiral is dirty. Clean the spiral.

Channels of the drive reels

Check the channels of reels and
are not compatible with
change with the reels suitable for
wire type or diameter being
the used wire. Clean the grooves.
used. Grooves are dirty.

There is problem in Channels of drive reels

wire feeder unit, are worn or grooves are Replace worn reels with the new ones.
engine operates crushed.
but wire does not
advance properly Remove the welding wire from contact
Welding wire jammed in
nozzle. Replace the contact nozzle if
contact nozzle.
necessary.

Control cable
Change the control cable.
(multiple cable) is faulty.
MANUAL
USER

Trigger of welding torch is

Replace the trigger of welding torch.
faulty.

Wire feed engine is faulty. Contact with technical service.

There is problem in wire Control board (PC-board) is

feeder unit, engine doesn’t Contact with technical service.
faulty.
operate. When pressed on
torch trigger, wire doesn’t Check the power unit and mains supply
advance. connection. Turn on the machine if it is
Problem in energy inlet
closed. If inlet fuse is blown, change the
fuse.

Control board (PC-board) is

Change the control cable
faulty.
There is open circuit
voltage and gas flow, but Control cable (multiple cable)
wire feeding functions Change the potentiometer.
is faulty.
doesn’t operate.
Current setting potentiometer
Contact with technical service.
is faulty.

There is no energy in AC
Contact with technical service.
There is wire feeding and contactor coil.
gas flow, but there is no
open circuit voltage. Control board (PC-board) is
Contact with technical service.
faulty.

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 Maintenance and Troubleshooting - 3

PROBLEM REASON SOLUTION

Supply voltage value is too Check the supply voltage as to be

low (under 350 V). 380 ±10%V.

Open circuit voltage is low. One of the phases is missing

Check the mains phases.
in supply voltage.

Diode gropu is faulty. Change the diode group.

There is disconnection in
Check the grounding cable connection.
grounding cable

There is open circuit

voltage and wire feeding There is too much oil, dirt
function operates. But and ve pas var. rust on
Provide good contact between the
there is no arc. workpiece.
surfaces by performing necessary
The contact between work
cleaning.
clamp and workiece is not
good

Machine does not Check if water hoses are blocked. If they are
There is no water
operate. blocked, clean. Check the water level.
circulation
Warning lamp flashes If it is low, refill.

Contact nozzle and wire

MANUAL
Check the contact nozzle and wire
feed reels is not compatible

USER
feed reels, change if necessary.
with the used wire.

Check wire guides and spiral. Clean or

There is strain in any point
replace if necessary.
of the torch.
Do not too much bend the torch cable.
Arc is not stabile
and too much
splashing occurs. One of the phases is
Check the mains phases.
missing in supply voltage.

Diode gropu is faulty. Change the diode group.

There is incompatibility
Check the wire feeding speed and
between wire feeding
voltage value.
speed and voltage value.

Current setting
Change the potentiometer.
potentiometer is faulty.
Welding current
cannot be set correctly.
Control board (PC-board) is
Contact with technical service.
faulty.

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 Maintenance and Troubleshooting - 4

PROBLEM REASON SOLUTION

Gas hose is not connected Check the hose and gas connection
or there is disconnection in system. Tighten the connections.
the hose. Replace the hose if necessary.

There is no shielding
Gas hose is crushed or
gas flow. Check the gas connection hose.
blocked.

Clean the electronic valve or replace

Gas solenoid is faulty.
with the new one.

End of the wire stucked to Change the contact nozzle and if

contact nozzle. necessary change the nozzle.

Inlet guide is too away Check the distance. Perform

from the wire feed reels or necessary adjustments. Clean
Wire is curled within guides are blocked. the guides.
torch, bended in
feed reels or inlet
guide. Inlet /outlet guides and wire
Perform the necessary changes
feed reels are not on the
to have them on the same axis.
same axis.

Inner diameters of inlet/

MANUAL

outlet guides are too wide Change inlet/outlet guides.

USER

or too narrow.

There is no supply voltage. Check the mains voltage.

Power indicator lamp

On/Off switch is faulty. Change On/Off switch.
doesn’t light upon
machine start.

Power indicator lamp is

Change the power indicator lamp.
faulty.

Power indicator lamp

Thermal protection is
lights but contactor Leave the machine to cool down.
activated.
doesn’t operate.

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 Failures in Welding Seams - 1

Pore Creation
Possible Reasons :
1- Insufficient gas shielding.
2- Used gas is dirty or gas flow speed is not suitable.
3- Surface of welding wire is dirty.
4- Work piece is dirty.
5- Voltage value is too high.
6- Distance between the nozzle and workpiece (free wire length) is too much.
Solutions :
1- To remove all air within the welding area, increase the gas flow rate. To prevent the entry of
turbulence and air into welding seam, do not set the flow rate to an extremely high value.
Clean splashed burr particles from nozzle. Prevent leakages in the gas hose. Stop air
flows that directly reach to arc (operating fans, open doors, etc). When welding with C0 2
gas, to prevent clogging of the regulator due to freezing use heater or connect several gas
cylinders to each other. Decrease the advancing speed. Decrease the distance between
nozzle and workpiece. Until molten metal become solid, keep the torch at the end of the
welding seam.
2- Use a quality gas manufactured for welding. Adjust the gas flow rate.
3- Only use clean and dry welding wire.
4- Remove all oil, grease, rust, paint and dirt from workpiece surface. Use a welding wire
that contains more oxide solvent element.
5. Decrease the voltage value.
6. Shorten the length of free wire (at nozzle outlet).

MANUAL
USER
Insufficient Fusion
Possible Reasons :
1- There is coating or excessive oxide layer on the surface in welding area.
2- Heat input is insufficient.
3- Welding puddle is bigger than required.
4- Applied welding technique is wrong or movement given to the torch is not stabile.
5- Seam combination style is wrong.
6- Advancing speed is too high.
Solutions :
1- Clean scale and oxide residues from all surfaces in the welding seam area.
2- Increase wire feed speed and arc voltage. Decrease free wire length.
3- To control welding puddle more easily do not perform over oscillatory welding. Increase
the advancing speed.
4- If you perform oscillatory welding, wait a moment at the edges of seam. Enhance access
to root of seam. Route the welding wire to the front of weld puddle. Adjust torch angle at
corner welding.
5- To enable access to seam soul, adjust combination angle properly. To fuse seam corners,
adjust free wire length or prepare (J) or (U) seam.
6- Decrease wire feed speed.

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 Failures in Welding Seams - 2

Insufficient Penetration
Possible Reasons :
1- Combination preparation is wrong.
2- Applied welding technique is wrong.
3- Heat input is insufficient.
Solutions :
1- To access to the soul of seam, with the condition to provide correct free wire length and
arc characteristics, revise connection shape and connection preparation. Avoid that the
height in the root is extremely high. In butt joint welding, increase root opening or deepen
the groove opened reversely.
2- To achieve maximum penetration, hold the welding wire perpendicular to workpiece.
Route the arc to the front of weld puddle.
3- Current may be too low according to voltage. Increase the wire feeding speed, so the
current. Do not change the free wire length.
Root Sagging
Possible Reasons :
1- Welding speed is too low.
2- Current is too high when compared to the voltage.
Solutions :
1- Increase the advancing speed. Adjust the torch angle.
2- Increase the arc voltage.
Splashing
Possible Reasons :
1- Welding wire short circuits by contacting to work piece.
MANUAL

2- CO2 is used as shielding gas.

USER

3- Welding process is performed with global conduction by using argon gas. Solutions.
Solutions :
1- Increase the arc voltage. If you are operating with short circuit conduction, limit the current
increase by increasing the inductance in welding machine.
2- Decrease the arc voltage or “immerse” the arc by increasing the wire feeding speed, so
limit the splashing.
3- By increasing the current, enter into spray conduction mode.
Edge Burn
Possible Reasons :
1- Advancing speed is too high.
2- Welding voltage is too high.
3- Welding current is too high.
4- Waiting time is insufficient.
5- Torch angle is wrong.
Solutions :
1- Decrease the advancing speed.
2- Decrease the voltage.
3- Decrease wire feed speed.
4- Wait more in the edges of molten weld puddle.
5- By adjusting the torch angle, enable arc to route the molten metal.
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 YELLOW
MIG 1 BOARD

KUMANDA
SOKETİ

GREEN

AMMETER

GAS TEST

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VOLTMETRE

HEATER SOCKET

PLUG
HEATER
MOTOR TEST
RED
PUMP FAN
WATER SENSOR
TRIGGER

TORCH
Electrical Circuit Diagram - 1

CHOKE COIL WORK

POWER TRANSFORMER

ASKAYNAK

81
MasterMIG 420W
USER
MANUAL
 USER
MANUAL

82
38 20

24 21

25 22 19 18 17
27 16
23
Power Unit

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1

13 12 11 41

14
40
9
15
10
30 32 33 39
Spare Parts - 1

31
34
A
23

35
3 2 7 4 5 8 6 28
29 37 36
 Spare Parts - 2

No. Part Number Part Description Amount

1 82N01301000 Right side panel 1

2 82N01301001 Left side panel 1
3 82N01301002 Rear wheel 2
4 82N01301003 Lower panel (base sheet metal) 1
5 82N01301004 Front swiwel wheel 2
6 82N01301005 Radiator 1
7 82N01301006 Choke coil 1
8 82N01301007 Rectifier Diode 1
9 82N01301008 Main Transformer 1
10 82N01301009 Transformer mounting stand 1
11 82N01301010 Contactor 1
12 82N01301011 Auxiliary transformer 1
13 8212435810 Capacity PCB 1
14 82N01301012 Coolant pump 1
15 82N01301013 Fan 1
16 82N01301014 Water tank 1
17 82N01301015 Top Cover 1
18 82N01301016 Medium panel 1
19 82N01301017 Rear panel 1
20 8220757813 Water inlet/outlet socket 2
21 8220757757 Heater plug-Female 1
21 8220757756 Heater socket-Male 1

MANUAL
USER
22 8220754122 Control cable socket 1
23 82N01301018 Welding cable connection socket - Female 3
24 8220752020 Water cooling fuse - 3A 1
25 82N01301019 Wire feeder fuse - 5A 1
26 8220752019 Heater fuse - 8A 1
27 82N01301020 Wire drive unit support shaft 1
28 82N01301021 Front panel 1
29 82N01301022 Digital current indicator 1
30 82N01301023 Digital voltage indicator 1
31 82N01301024 On/Off switch 1
32 82N01301025 Power lamp 1
33 82N01301026 Thermostat lamp 1
34 82N01301027 Water pump warning lamp 1
35 82N01301028 Precise voltage setting switch 1
36 82N01301029 Coarse voltage setting switch 1
37 8220505072 Voltage setting switch button 2
38 82N01301030 Gas cylinder rest 1
39 82N01301031 Pulling handle mounting piece-Left 1
40 82N01301032 Pulling handle mounting piece-Right 1
41 82N01301033 Pulling handle 1

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 Spare Parts - 3

Wire Feeder Unit

26

10

11

14

15
12
13
9

16
17
8
1

7
3

18
MANUAL
USER

19
6

20
25

21
22
24

23
4

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 Spare Parts - 4

No. Part Number Part Description (Wire Feeder Unit) Amount

1 8220505301 Welding wire reel protector (plastic) 1

2 82N01401000 Left side panel-Moving 1
3 82N01401001 Right side panel - Stable 1
4 8220740312 Wire drive unit - Complete 1
5 8220711006 Potentiometer button 2
6 82N01401002 Inner medium panel 1
7 82N01401003 Handle 1
8 82N01401004 Rear panel 1
9 82N01401005 Gas selenoid 1
10 8220754104 Control cable socket 1
11 82N01401006 Welding cable connection socket - Female 1
12 82N01401007 Base panel 1
13 82N01401008 Wire rise time potentiometer 1
14 82N01401009 Control board 1
15 82N01401010 Connecting terminal 1
16 82N01401011 Burn-back potentiometer 1
17 82N01401012 Rear wheel 2
18 82N01401013 Support shaft housing 1
19 82N01401014 Front wheel 2
20 82N01401015 Front panel 1
21 8220711009 Wire feed speed potentiometer button 1
22 8220780634 Free wire and gas button 2
23 8220505015 Insulating flange 1

MANUAL
24 8220780371 2-4 trigger selection switch 1

USER
25 8220757813 Water inlet/outlet socket 4

Warning Label

For detailed information, please read the “Safety In Welding” section in pages 50-57.

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 Wire Feeder and Power Unit Specifications

Power Unit
MANUAL
USER

Wire Feeder Unit

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