UNIVERSITI TEKNIKAL MALAYSIA MELAKA
FAKULTI KEJURUTERAAN MEKANIKAL
WORKSHOP REPORT
DMCU 1912 – TECHNOLOGI AND SEMESTER I SESSION 2021/2022
ENGINEERING WORKSHOP
PRACTICE 1
ARC & MIG WELDING / FABRICATION / FITTING
No. Name Matrix No. Section
1. Muhammad Asyrafil Syahmi Bin D042110159 1
Mohamad Rafi
2. Muhammad Fareez Hamzah Bin D042110040 1 Group
A3/K9
Hamdi
3. Muhammad Hasyir Putra Bin Hasni D042110183 1
- - - - Submission
- - - date
/ /
-
Prepared for :
LECTURER REMARKS EVALUATION
1.0 Title & Objectives
2.0 Introduction & Theory
3.0 Work Procedures & Apparatus
4.0 Suggestion for improvement
5.0 Conclusion
6.0 References
TOTAL
1.0 TITLE & OBJECTIVES:
1.1 TITLE: LAB REPORT FOR WELDING
1.2 OBJECTIVES:
To give a new experience to the students in welding especially arc welding and
MIG welding
To give the knowledge to the students how the welding process going in order to
combine two or more parts using the different joints
To sharpen the students’ skill in welding process to make sure that their forms are
done as instructed
To aware the students about their safety while doing the welding process to avoid
any unwanted things happened
To master the basic things in welding process
2.0 INTRODUCTION & THEORY
2.1 INTRODUCTION
Welding is a process when we want to combine two or more parts using heat, pressure
or both of heat and pressure. When the combined parts are cold, the parts will form a strong
joint. Usually, we use the welding process on metals and thermoplastics but welding process
can also be used on wood. There are two types of welding process that we used, arc welding
and MIG welding. We are instructed to do the welding process using a steel plate which is we
need to combine 2 steel plates using arc welding and 2 steel plates using MIG welding. For arc
welding, we are instructed to weld 2 steel plates in form of butt joint. While for the MIG
welding, we need to weld 2 steel plates in form of T joint.
2.2 THEORY OF WELDING
Definition Shielded metal arc-welding (SMAW) is a process when we use to combine
a metal with a metal using electricity in order to create a heat for melting the metal plate. After
the melted plate is cool and form a strong plate, the strong plate is a binding of the metal as
half of all industrial and maintenance welding is done by SMAW process. Arc welding
happened when the electric arc is run by touching the end of the coated electrode with the metal
plate and immediately take the suitable distance between the end of the coated electrode and
the plate to maintain the arc welding process. This process will create the heat for melting little
by little end of the coated electrode. The welding process will produce a coating layer outside
of the metal near the places that we had welded. The coating layer must be removed from the
place that we had welded. When the coated electrode deoxidizes, the welding places produce
a shielding gas to protect the welded places from the oxygen around the environment. In
addition, the arc welding mostly run in a narrow area to complete it. Meanwhile, Metal Inert
Gas (MIG) welding process is included in types of welding that is run by conducting an electric
and carbon dioxide gas. MIG welding process means an arc welding process that uses a
continuous solid wire electrode that is heated and goes out from the welding gun. MIG welding
process is preferred for combining a thin sheet with a thick section component. The result of
MIG welding process is occurred when an arc is created between the end of the electrode wire
and the plate. The electrode wire represents as a heat source by the arc at the wire tip as a filler
metal in the welding joint. The wire is pushed out by a nozzle that encircling the wire to protect
the weld area from the environments. The material being welded and the application dictate
the sort of shielding gas to utilis. The wire is fed from a reel by a motor drive, and the welder
pushes the welding torch along the joint line. There are solid (drawn wires) and cored wires
available (composites formed from a metal sheath with a powdered flux or metal filling).
Consumables are frequently cheaper than those used in other activities. Because the wire is
continuously fed, the process is quite productive.
3.0 WORK PROCEDURES & APPARATUS
3.1 PROCEDURE
Before do the welding process
I. Ensure the lab is safe to the welding in specific way the plugging and the air flow
in the lab.
II. Wear the leather apron and leather hand gloves to avoid us from touching the hot
metal during this welding process.
III. Wear face shield by doing the welding process to see the light.
IV. Prepare the items that will be used during the welding process.
Arc welding
I. Clean the surface of the mild steel bar that is used for welding with wire brush.
II. Close the plate pieces and prepare the weld space at a reasonable distance.
III. Select the electrode that suit the type of connection work.
IV. Adjust the electric current to suit the size of the electrode.
V. Start the arc by scratching or tapping.
VI. Perform nail welding to fix the connection.
VII. Start welding along the connection to completion.
VIII. Turn off the switch on the welding machine.
IX. Clean the broken pieces with wire brush.
MIG welding
I. Clean the surface of the mild steel bar that is used for welding with wire brush.
II. Mark 2 straight lines on one mild steel bar.
III. Move the component closer and leave enough space to weld.
IV. Set the machines that were used for MIG welding and switch on the machines.
V. Make sure the wire is out of the nozzle by 0.5 cm before doing welding
process.
VI. Do the welding nails to keep the component in place.
VII. Starts the welding by doing along the connection until the 2 straight lines are
done.
VIII. Nail the mild steel bar that were weld in (vii) in the middle of other empty
mild steel bar to make a Tee joint.
IX. Weld both steel bars.
X. Clean them with wire brush.
XI. Switch off the machines after finishing the welding process.
PROJECT:
ARC WELDING
MIG WELDING
3.2 APPARATUS:
ARC:
i. Arc welding machine (welding transformer DC rectifier/ DC generator)
ii. Ground clamp
iii. Electrode holder
iv. Electrode
v. Mild steel flat bar
vi. Plier
vii. Wire brush
viii. Chipping hammer
ix. Cooling system
MIG:
i. DC transformer
ii. Shielding gas cylinder
iii. Cooling system
iv. Plier
v. Control unit
vi. Welding gun
vii. Wire feed system
viii. Wire brush
ix. Regulator
SAFETY WEAR:
i. Leather apron
ii. Leather hand gloves
iii. Face shield
iv. Safety shoes
4.0 SUGGESTION FOR IMPROVEMENT
Safety gear
o All the face shields must be put anything like rubber to ease the students wearing
the face shields without holding them while welding.
o The aprons’ rope around the waist must be longer so that any students which
are quite big can wear the aprons comfortably.
o The teared hand gloves must be replaced with the new hand gloves to avoid the
students’ hand burnt because of welding sparkling.
Apparatus
o Make sure all the apparatus are in good condition and safe to be used by the
students
o Provide adequate apparatus to all the students so that all the students can do the
welding.
o Always observe the students and give the instruction clearly in order to avoid
any injuries occurred.
5.0 CONCLUSION
Welding is a common activity for engineers, and our team should be concerned about
the practices and safety suggestions supplied to us. We must measure the components that we
wish to weld before we begin the welding process, since faulty measurements may have an
impact on the final output of our project. If we do not finish the measurements for our project,
our ultimate product will suffer. Next, we have no prior welding experience. When welding,
we always adhere to the highest safety regulations. When welding, for example, use a face
shield and gloves. As a result, my crew successfully completed the welding project. There were
also professionals on hand to help us comprehend the significance of safety requirements and
how to execute the project without mishap. As a result, we were able to select the best technique
for finishing our task.
6.0 REFERENCES
Ikmal Idham, (2017), Mechanical Engineering (BMM),
https://www.studocu.com/my/document/universiti-malaysia-pahang/mechanical-
engineering/lab-report/6298526
(December 20, 2021), MIG Welding (GMAW) Process Techniques & Tips,
https://weldguru.com/mig-welding/
(March 11, 2021), What Are The 4 Types of Welding?,
https://www.iavalley.edu/blog/2021/03/11/what-are-the-4-types-of-welding/
