1/18/2021 Paper 1 - MSR-WI-1a

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TWI SEA - WIS5 & WIS7 Training

Candidate name *

Nguyễn Hoàng Sơn

1. Which mechanical test can be used to measure the toughness of weld 2/2
metal, HAZ and parent material? *

a Macro.

b Nick break.

c Hardness.

d Charpy impact.

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2. Which is the best destructive test for showing lack of sidewall fusion in 2/2
a 25mm thickness butt weld ? *

Nick break.

Side bend.

Charpy impact.

Face bend test.

3. The principal purpose of a welder qualification test (WQT) is to: * 2/2

a Test the skill of the welder.

b Assess the weldability of the materials.

c Decide which NDT methods to use.

d Give the welder practice before doing production welding.

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4. A fabrication procedure calls for the toes of all welds to be blended in 2/2
by grinding.The reason for doing this is to: *

a Make the welds suitable for liquid (dye) penetrant inspection.

b Improve the fatigue life.

c Reduce residual stresses.

d Improve the general appearance of the welds.

5. For full penetration single-sided butt joints, root bead penetration and 2/2
profile are mainly influenced by: *

a Root face.

b Bevel angle.

c Root gap.

d Included angle.

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6. Which of the following would be cause for rejection by most 0/2

fabrication standards when inspecting fillet welds with undercut, a small
amount of? *

a Depth.

b Length.

c Width.

d Sharpness.

Câu trả lời đúng

d Sharpness.

Phản hồi

because sharp undercut easily going to initiated the crack

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7. When visually inspecting the root bead of a single V-butt weld it should 2/2
be checked for: *

a Lack of root penetration.

b HAZ hardness.

c Tungsten inclusions.

d Slag.

8. The strength of a fillet weld is determined by: * 2/2

a Leg length.

b Weld profile.

c Weld width.

d Throat thickness.

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9. The European Standard for NDE of fusion welds by visual examination 2/2
is: *

a EN 15614.

b EN 2560.

c EN 287.

d EN 17637.

10. Visual inspection of a fabricated item for a high integrity application 2/2
should cover inspection activities: *

a Before, during and after welding.

b Before welding only.

c After welding only.

d During and after welding only.

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11. Incomplete root penetration in a single V butt joint may be caused by: 2/2
*

a Excessive root face.

b Excessive root gap.

c The current setting being too low.

d Both a and c.

12. Incomplete root fusion in a single V butt weld may be caused by: 2/2

a Linear misalignment.

b Root gap being too large.

c Root faces being too small.

d Welding current too high.

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13. When visually inspecting the face of a finished weld which of the 2/2
following flaws would be considered the most serious: *

a Excess weld metal height.

b Start porosity.

c Spatter.

d Arc strikes.

14. A burn-through may occur if the: * 2/2

a Current is too low.

b Root face is too large.

c Root gap is too large.

d Arc voltage is too high.

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15. A Code of Practice is a: * 2/2

a Standard of workmanship quality only.

b Set of rules for manufacturing a specific product.

c Specification for the finished product.

d Code for the qualification of welding procedures and welders qualifications.

16. A solid inclusion in a weld may be: * 2/2

a Entrapped slag.

b Entrapped gas.

c Lack of inter-run fusion.

d None of the above.

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17. Which of the following is a planar imperfection? * 2/2

a Lack of sidewall fusion.

b Slag inclusion.

c Linear porosity.

d Root concavity.

18. For fillet welds it is normal practice in the UK and USA to measure: * 2/2

a Throat thickness.

b Leg lengths.

c Penetration depths.

d Both a and c.

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19. In a bend test, when the face of the specimen is in tension and root is 2/2
incompression, the test is called a *

a Root bend.

b Side bend.

c Face bend.

d Longitudinal bend.

20. Heavy porosity on the surface of some MMA welds made on a 2/2
construction site is most likely to be caused by: *

a Use of the wrong class of electrodes.

b Use of excessive current.

c Moisture pick-up in the electrode covering.

d A bad batch of electrodes.

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21. Slag inclusions may be present in: * 2/2

a Manual metal arc welds.

b Metal inert gas welds.

c Metal active gas welds.

d All welds.

22. The main cause of undercut is: * 0/2

a Excessive amps.

b Excessive OCV.

c Excessive travel speed.

d Current too low.

Câu trả lời đúng

a Excessive amps.

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23. Which group of welders is most likely to require continuous 2/2

monitoring by a welding inspector? *

a Concrete shuttering welders.

b Overland pipeline welders.

c Tack welders.

d Maintenance welders.

24. Which of the following fillet welds is the strongest assuming they are 2/2
all made using the same material and welded using the same WPS? *

a 8mm throat of a mitre fillet.

b 7mm leg + 2mm excess weld metal.

c Mitre fillet with 10mm leg.

d Concave fillet with 11mm leg.

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25. A typical included angle for MMA welding a full penetration pipe butt 2/2
joint is: *

a 35°

b 70°

c 90°

d Dependent on the pipe diameter.

26. A fillet weld has an actual throat thickness of 8mm and a leg length of 2/2
7mm, what is the excess weld metal? *

a 2.1mm

b 1.8mm

c 3.1mm

d 1.4mm

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27. The fusion boundary of a fillet weld is the: * 0/2

a Boundary between the weld metal and HAZ.

b Boundary between individual weld runs.

c Depth of root penetration.

d Boundary between the HAZ and parent material.

Câu trả lời đúng

a Boundary between the weld metal and HAZ.

28. If a Welding Inspector detects a type of imperfection not allowed by 2/2

the application Standard he must: *

a Request further NDE.

b Reject the weld.

c Prepare a concession request.

d Reject the weld if he considers it to be harmful.

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29. BS EN 17637 allows the use of a magnifying glass for visual inspection, 2/2
but recommends that the magnification is: *

a x2.

b x2 to x5.

c x5 to x10.

d Not greater than x20.

30. The majority of welder qualification tests are carried out using 2/2
unbacked joints,because: *

a It is quicker and cheaper if back gouging is not required.

b If the welding process is not TIG back purging is not required.

c All welder qualification tests are done on small diameter pipe.

d It requires more skill and increases the welders’ qualification range.

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31. Deflection of the arc by magnetic forces that can make welding 2/2
difficult to control iscommonly known as: *

a Arc initiation.

b Arc misalignment.

c Arc blow.

d Arc constriction.

32. Which of the following electrode types is classified to EN ISO 2560? * 0/2

a E 38 3 R.

b E 6013.

c E 7018 - G.

d E 51 33 B.

Câu trả lời đúng

a E 38 3 R.

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33. Which type of electrode is used for stovepipe welding for overland 2/2
pipeline construction? *

a Rutile.

b Cellulosic.

c High recovery rutile.

d Acid-rutile.

34. The three main types of MMA electrodes used for welding C and C- 2/2
Mn steels are: *

a Basic, cellulosic and rutile.

b Neutral, cellulosic and rutile.

c Basic, cellulosic and neutral.

d Rutile, low hydrogen and basic.

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35. A WPS may specify a maximum width for individual weld beads 2/2
(weave width)when welding C-Mn steels. If the width is exceeded it may
cause: *

a Lack of inter-run fusion.

b A reduction in HAZ toughness.

c Lack of sidewall fusion.

d Too low a deposition rate.

36. You notice that MMA electrodes with the flux covering removed are 2/2
being used as filler rods for TIG welding. This should not be allowed
because: *

a It is wasteful.

b The rod diameter may be too large.

c The weld metal composition may be wrong.

d The rod is too short.

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37. In TIG welding a current slope-out device reduces: * 2/2

a Tungsten spatter.

b Risk of crater cracking.

c Risk of arc strikes.

d Interpass temperature.

38. Which type of power source characteristic is normally used for 2/2
manual welding? *

a Constant voltage.

b Flat characteristic.

c Constant current.

d A motor generator.

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39. In MMA welding penetration is principally controlled by: * 2/2

a Arc voltage.

b Welding speed.

c Ferro-silicon in the electrode coating.

d Current.

40. Pipe bores of some materials must be purged with argon before and 2/2
during TIG welding to: *

a Prevent linear porosity.

b Prevent burn-through.

c Prevent oxidation of the root bead.

d Eliminate moisture pick-up in the root bead.

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41. The chemical composition of the weld metal deposited by a C-Mn 2/2
steel MMA electrode is usually controlled by: *

a Core wire composition.

b Additions in the flux coating.

c Iron powder in the flux coating.

d Dilution from the base material.

42. Silicon is added to steel and the covering of MMA electrodes to: * 2/2

a Provide deoxidation.

b Improve strength.

c Improve toughness.

d Provide more resistance to hydrogen cracking.

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43. A fusible insert for TIG welding helps: * 2/2

a Reduce porosity.

b Give controlled root penetration.

c Avoid the need for a back purge.

d By acting as a backing for the root run.

44. According to AWS 2.4 a weld symbol for the other side is placed: * 2/2

a Above the dashed line.

b Below the dashed line.

c Above the solid line.

d Below the solid line.

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45. The term low hydrogen electrode is often used for certain 2/2
electrodes. What type of covering will they have? *

a Cellulosic.

b Rutile.

c Acid.

d Basic.

46. A hydrogen controlled MMA electrode can always be recognised by 2/2

the: *

a EN code letter (or AWS code number).

b Electrode length.

c Trade name.

d Colour of the covering.

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47. According to BS EN 22553 which of the following symbols requires 2/2

weld toes to be smoothly blended on the other side? *

A B

C D

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48. Which of the following units is used to express heat input? * 2/2

a Joules.

N/mm2 b .

J/mm2 c .

d kJ/mm.

49. Which of the following elements is added to steel to give resistance 2/2
to creep at elevated service temperatures? *

a Nickel.

b Manganese.

c Molybdenum.

d Aluminium.

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50. Nick break and fillet fracture tests are used for assessing: * 2/2

a Weld quality.

b Weld metal ductility.

c Weld metal toughness.

d Resistance to fracture.

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