1/21/2021 Paper 1 - MSR-WI-4a

Paper 1 - MSR-WI-4a Tổng điểm 90/100

TWI SEA - WIS5 & WIS7 Training

Địa chỉ email *

nguyenhoangson904@gmail.com

Candidate name *

Nguyễn Hoàng Sơn

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1 What four criteria are necessary to produce hydrogen-induced cold 2/2

cracking? *

a Hydrogen, moisture, martensitic grain structure and heat.

b Hydrogen, poor weld profiles, temperatures above 200o b C and a slow cooling
rate.

c Hydrogen, a grain structure susceptible to cracking, stress and a temperature

below 300o C.

d Hydrogen, existing weld defects, stress and a grain structure susceptible to

cracking.

2 In which of the following mechanical tests would show a change in the 2/2
material from ductile to brittle with the use of a transition curve? *

a Tensile test.

b Charpy test.

c Fusion zone test.

d All of the above.

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3 Normalizing: * 2/2

a Fast cooling from the austenite region when applied to steels.

b Is slowly cooled from the austenite region to approximately 680o b C and then
cooled down in air.

c Is slowly cooled down in air from below the lower critical limit.

d None of the above.

4 Assuming that the welding process, material thickness, carbon 2/2

equivalent and the welding parameters to be the same, which of the
following joint types would normally require the highest preheat
temperature? *

a Edge joint.

b Lap joint.

c Butt joint (single V).

d T joint

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5 Austenitic stainless steels are more susceptible to distortion when 2/2

compared to ferritic steels this is because: *

a High coefficient of thermal expansion, low thermal conductivity.

b High coefficient of thermal expansion, high thermal conductivity.

c Low coefficient of thermal expansion, high thermal conductivity.

d Low coefficient thermal expansion, low thermal conductivity,

6 Preheat temperature: * 2/2

a May be increased by an increase in travel speed.

b May be increased by a reduction in material thickness.

c May be increased by an increase in electrode diameter.

d None of the above.

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7 Which of the following properties may be applicable to a carbon steel 2/2

weld (CE 0.48) welded with a fast travel speed without preheat? *

a Narrow heat affected zone and hardness value in excess of 350 HV.

b Broad heat affected zone and hardness values in excess of 350 HV.

c A very tough and narrow heat affected zone.

d Narrow heat affected zone and low hardness values.

8 Which of the following test pieces taken from a charpy test on a 2/2
carbon-manganese steel weld, welded with a high heat input is most
likely to have the lowest toughness? *

a Test piece taken from parent metal.

b Test piece taken from weld metal.

c Test piece taken from HAZ.

d All of the above values will be the same.

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9 Which is the correct arc energy for the following parameters, amps 2/2
350, volts 32 and the travel speed 310 mm/minute (MMA welding
process)? *

a 2.16 kJ/mm.

b 0.036 kJ/mm.

c 21.60 kJ/mm.

d 3.6 kJ/mm.

10 A multi-pass MMA butt weld made on carbon steel consists of 5 2/2

passes deposited using a 6mm diameter electrode. A 12-pass weld made
on the same joint deposited using a 4mm diameter electrode on the
same material will have: *

a A lower heat input and a higher degree of grain refinement.

b A lower heat input and a coarse grain structure.

c A lower amount of distortion and a higher degree of grain refinement.

d A higher amount of distortion and a lower degree of grain refinement.

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11 Transverse tensile test: * 2/2

a Is used to measure the ultimate tensile strength of the joint.

b Is used to measure the elongation of a material.

c Is used to measure the yield strength of a material.

d All of the above.

12 Mechanical tests: * 2/2

a Tensile tests are used to provide a quantitative measurement of weld zone

ductility.

b Bend tests are used to provide a quantitative measurement of weld zone ductility.

c VPN tests are used to provide a qualitative measurement of weld zone ductility.

d All of the above could be used to provide a quantitative measurement of weld zone
ductility.

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13 Bend tests: * 2/2

a On a 25mm thick carbon steel butt weld a side bend would be the best for the
detection of lack of inter-run fusion.

b On a 25mm thick carbon steel butt weld a face bend would be the best for the
detection of lack of inter-run fusion.

c On a 25mm thick carbon steel butt weld a root bend would be the best for the
detection of lack of inter-run fusion.

d On a 25mm thick carbon steel butt weld a Longitudinal bend would be the best for
the detection of lack of inter-run fusion.

14 EN 287 / ISO 9606 standard refers to what: * 2/2

a Welder approval.

b Welding procedure approval.

c Visual Inspection of fusion welds.

d Welding Inspection Personnel.

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15 EN 2560 standard refers to which of the following? 0/2

a Welding terms and symbols.

b Covered electrodes for MMA.

c Filler wires for MIG/MAG and TIG.

d SAW Flux.

Câu trả lời đúng

b Covered electrodes for MMA.

16 The main reason for qualifying a welding procedure is: * 2/2

a Determine the welder’s ability.

b Check whether the acceptance criteria specific to the project can be met.

c To show that the fabricator has good welding control.

d To show the welded joints meet the requirements of the specification.

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17 Degreasing agents used on components are essential for quality 0/2

welding, during and after welding some agents may: *

a Cause corrosion problems.

b Leave residues.

c Give off toxic gases.

d All of the above.

Câu trả lời đúng

c Give off toxic gases.

18 In the welding of austenitic stainless steels, the electrode and plate 2/2
materials are often specified to be low carbon content. The reason for
this: *

a To prevent the formation of cracks in the HAZ.

b To prevent the formation of chromium carbides.

c To prevent cracking in the weld.

d Minimise distortion.

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19 Essential variable: * 2/2

a In a WPS may change the properties of the weld.

b In a WPS may influence the visual acceptance.

c In a WPS may require re-approval of a weld procedure.

d All of the above.

20 NDT: * 2/2

a MPI can only detect surface breaking defects.

b DPI can only detect surface breaking defects.

c UT can only detect surface breaking defects.

d Both a and b are correct statements.

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21 Radiographic testing: * 2/2

a On a radiograph, slag inclusions and copper inclusion would both show up as light
indications.

b On a radiograph, tungsten inclusions and excessive root penetration would

both show up as light indications.

c On a radiograph, cap undercut and root piping would both show up as light
indications.

d On a radiograph, excessive cap height and incomplete root penetration would both
show up as dark indications.

22 Lamellar tearing: * 2/2

a Can be prevented by the use of plate materials containing low levels of impurities.

b Can be prevented by the use of buttering runs.

c Is best prevented by post weld stress relief.

d Both a and b are correct.

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23 When considering radiography using X-ray, which of the following 2/2

techniques is most likely to be used for a pipe to pipe weld
(circumferential seam), 610mm diameter with no internal access? *

a SWSI.

b DWSI.

c DWDI.

d SWSI-panoramic.

24 Balanced welding techniques: * 2/2

a Are used for controlling lamellar tearing.

b Are used to increasing weld toughness.

c Are used to reduce weld zone hardness.

d Are used to reduce distortion.

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25 Radiographic testing: * 2/2

a On a radiograph lack of root fusion would most likely show up as a dark

straight line with a light root.

b On a radiograph lack of root fusion would most likely show up as a dark root with
straight edges.

c On a radiograph lack of root fusion would most likely show up as a dark uneven
line following the edge of the root.

d Lack of root fusion cannot be seen on a radiograph.

26 Is it permissible to allow a multi-pass butt weld to cool down between 2/2

weld passes? *

a It should be up to the welding inspector.

b No the weld must be kept hot at all times.

c It depends on the welder.

d It depends on the specification requirements.

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27 A T joint on a support bracket is to be welded both sides using a 5mm 2/2

leg length fillet weld, each weld is to be intermittent 50mm in total
length, the gap between each weld is to be 25mm. Which of the
following is the correct symbol in accordance with ISO 2553? *

Option 1

28 SAW welding process: * 2/2

a The use of excessive voltages would result in insufficient flux melting.

b The use of excessive voltages would result in excessive flux melting.

c The use of excessive voltages would result in easy slag removal.

d The use of excessive voltages would result in excessive spatter.

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29 Cellulose electrodes have which of the following properties? * 2/2

a Viscous slag, large volumes of shielding gas and UTS values above 90,000psi.

b Large volumes of shielding gas, high spatter contents and hydrogen levels <15ml
per 100g of weld metal deposited.

c Large volumes of shielding gas, hydrogen contents > 15ml per 100g of weld
metal deposited and should be never baked.

d High spatter contents, high deposition and large volumes of gas shield.

30 EN 2560, E50 3 1Ni B 2 1 H5, what does the 3 represent? * 0/2

a A minimum charpy value of 30 joules.

b A maximum impact value of 47 joules.

A minimum impact temperature of –30o c C at a given joule value.

d None of the above.

Câu trả lời đúng

A minimum impact temperature of –30o c C at a given joule value.

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31 Fatigue cracks: * 2/2

a The fracture surface is rough and randomly torn.

b The fracture surface is smooth.

c The fracture surface has a step like appearance.

d The fracture surface is generally of a bright crystalline appearance.

32 E 6013: * 2/2

a Would most probably be used for welding low pressure pipework.

b Would most probably be used for welding high pressure pipework.

c Are used in the vertical down welding position on storage tanks.

d Are used in a situation where low hydrogen welds are specified.

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33 Which element in steel if present in significant amounts may lead to 2/2

hot shortness? *

a Phosphorus (P).

b Manganese (Mn).

c Silicon (Si).

d Sulphur (S).

34 Which of the following welding processes are commonly used for the 2/2
welding aluminum? *

a MIG and TIG.

b MAG and TIG.

c MMA and TIG.

d MMA and MIG.

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35 Radiographic testing: * 2/2

a Is most suited to the detection of volumetric flaws.

b Is most suited to the detection of all planar flaws.

c Both a and b.

d Is most suited to the detection of laminations in rolled plate materials.

36 Which of the following Isotopes may be used for a 25mm thick steel 2/2
pipe to pipe weld DWSI (In accordance with EN 1435)? *

a Ir 192.

b Co 60.

c ALR 75.

d Yb 169.

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37 Increasing the carbon content of a steel will: * 2/2

a Increase the hardness and toughness.

b Decrease the hardness and toughness.

c Increase hardness, decrease toughness.

d Decrease hardness, increase toughness.

38 Which of the following can be used to reduce the chances of 2/2

solidification cracking? *

a The use of a non-fluxed welding process and better quality materials.

b The use of better quality materials and the highest heat input process.

c The use of a low dilution process and wider joint preparation.

d The addition of silicon and a low hydrogen welding process.

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39 In an all weld metal tensile test, the original test specimens gauge 2/2
length is 50mm. After testing the gauge length increased to 72mm, what
is the elongation percentage? *

a 44%.

b 144%.

c 69.4%.

d 2.27%.

40 Fillet welds: * 2/2

a 1 to 1 is the ratio between the leg length and design throat thickness on a mitre
fillet weld with equal leg lengths.

b 2 to 1 is the ratio between the leg length and design throat thickness on a mitre
fillet weld with equal leg lengths.

c 1.4 to 1 is the ratio between the leg length and design throat thickness on a
mitre fillet weld with equal leg lengths.

d All of the above could be applicable it depends upon the leg length size.

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41 The toughness and yield strength of steel is reduced by: * 2/2

a Reducing the grain size.

b Increasing the heat input.

c Reducing the heat input.

d Both a and b.

42 How can you tell the difference between an EN/ISO weld symbol and 0/2
an AWS weld symbol? *

a The EN weld symbol will always have the arrow side weld at the top of the
reference line.

b The EN symbol has the elementary symbol placed on the indication line lying
above or below the reference line to indicate a weld on the other side.

c The EN symbol has the elementary symbol placed on the indication line lying
above or below the reference line to indicate a weld on the arrow side.

d The EN symbol has a fillet weld throat thickness identified by the letter z.

Câu trả lời đúng

b The EN symbol has the elementary symbol placed on the indication line lying above
or below the reference line to indicate a weld on the other side.

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43 E7018: * 2/2

a Is a basic low hydrogen electrode containing iron powder.

b Is a rutile electrode containing iron powder.

c Is a cellulose electrode suitable for welding in all positions.

d Is a basic electrode depositing weld metal yield strength of at least 70,000psi.

44 Ductile fracture: * 2/2

a Would have a rough randomly torn fracture surface and a reduction in area.

b Would have a smooth fracture surface displaying beach marks.

c Would have a step like appearance.

d Would have a bright crystalline fracture surface with very little reduction in area.

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45 Which of the following under typical conditions using the MMA 2/2
welding process would give the deepest penetration? *

a DC –ve.

b DC +ve.

c AC.

d Both a and b.

46 Cold shortness: * 2/2

a Is mainly caused by the presence of sulphur (S).

b Is mainly caused by the presence of phosphorous (P).

c Is mainly caused by the presence of manganese (Mn).

d Is mainly caused by the presence of silicon (Si).

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47 When considering the advantages of site radiography over 2/2

conventional ultrasonic inspection which of the following applies? *

a A permanent record, good for detecting lamellar tearing and defect identification.

b A permanent record produced, good for the detection of all surface and sub-
surface defects and assessing the through thickness depths of defects.

c Permanent record produced, good for defect identification and not as reliant
upon surface preparation.

d No controlled areas required on site, a permanent record produced and good for
assessing pipe wall thickness reductions due to internal corrosion.

48 HICC: 0/2

a In Carbon Manganese steel is most susceptible in the weld zone.

b Micro alloyed steel (HSLA) is most susceptible in the weld zone.

c Austenitic steel is most susceptible in the weld zone.

d Both a and b are correct statements.

Câu trả lời đúng

d Both a and b are correct statements.

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49 Lamellar tearing: * 2/2

a Is a product defect caused during the manufacturing of certain steels.

b Is a crack type, which occurs in the parent material due to welding

strainsacting in the short transverse direction of the parent material.

c Is a type of hot crack associated with impurities (sulphur, carbon and

phosphorous).

d Is a type of crack that occurs in the weld or parent material due to cyclic stresses.

50 A welding process where the welding plant controls the travel speed 2/2
and the arc gap but under constant supervision using a shielding gas
mixture of 80% argon –20% carbon dioxide is termed: *

a A manual MAG process.

b A semi-automatic MAG process.

c A mechanised MIG process.

d A mechanised MAG process

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