1/20/2021 Paper 1 - MSR-WI-3a

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Candidate name *

Nguyễn Hoàng Sơn

1. Which of the following steels is considered non-magnetic? * 2/2

a 18%Cr, 8%Ni.

b 2.25Cr 1Mo.

c 9%Cr,1Mo.

d 9%Ni.

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2. Weld spatter during MMA welding is most likely to be caused by: * 2/2

a Excessive current.

b Incorrect baking and storage of electrodes.

c Bad batch of electrodes.

d Too low an OCV.

3. A qualified Welding Procedure Specification is used to: * 2/2

a Give instruction to the welder.

b Give information to the welding inspector.

c Give confidence that welds will have the specified properties.

d All of the above.

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4 An arc strike (stray flash) on a steel component is regarded by some 2/2

codes as unacceptable because: *

a It will cause copper contamination.

b It may cause hard spots.

c It may give cracking.

d Both b and c.

5. In a transverse tensile test brittleness would be indicated if: * 2/2

a There is a reduction in cross-section at the position of fracture.

b The fracture surface is flat and featureless but has a rough surface.

c Fracture occurred in the weld metal.

d The fracture face shows beach marks.

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6. The surface of a fatigue crack will: * 2/2

a Be rough and torn.

b Have sharp chevron markings.

c Be smooth.

d Have shear lips.

7. What does the number 141 refer to on this drawing? * 2/2

a WPS number.

b Welding process.

c Filler material.

d Acceptance standard.

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8 The current/polarity used for TIG welding all materials except 2/2
aluminium and magnesium is: *

a DC negative.

b DC positive.

c AC.

d Square wave AC.

9. A typical temperature range for baking basic coated electrodes is: * 2/2

a 150-200°C.

b 200-250°C.

c 300-350°C.

d 400-450°C.

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10. If welding travel speed is doubled but the current and voltage remain 2/2
the same the heat input will be:

a Reduced by 50%.

b Increased by a factor of two.

c About the same.

d Reduced by approximately 25%.

11 .Which type of submerged arc welding flux is susceptible to moisture 2/2

pick-up? *

a Neutral.

b Agglomerated.

c Fused.

d All about the same.

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12. A large grain size in the HAZ of a C-Mn steel weld joint may have: * 2/2

a Low ductility.

b Low toughness.

c High toughness.

d High tensile strength.

13 A STRA test is used to measure the: * 2/2

a Tensile strength of the welded joint.

b Level of residual stress in butt joints.

c Fracture toughness of the HAZ.

d Through-thickness ductility of a steel plate (the Z direction).

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14 The risk of hydrogen cracking is greater when MMA welding: * 2/2

a C-Mn steels.

b Austenitic stainless steel.

c Low alloy steels for elevated temperature service.

d Low carbon steels for cryogenical service.

15. The property of a material which has the greatest influence on 2/2
welding distortion is its:

a Yield strength.

b Coefficient of thermal expansion.

c Elastic modulus.

d Coefficient of thermal conductivity.

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16. Which of the following is a suitable shielding gas for FCAW of 2/2
stainless steels? *

a 100% argon.

b 70% argon + 30%He.

c Argon + 5% hydrogen.

d Argon + 20% CO2.

17. The presence of iron sulphides in a weld bead may cause: * 2/2

a Solidification cracking.

b Hydrogen cracking.

c Lamellar tearing.

d Weld decay.

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18 A macrosection is particularly good for showing: 2/2

a The weld metal HAZ microstructure.

b Overlap.

c Joint hardness.

d Spatter.

19. Which of the following procedures would be expected to produce the 2/2
least distortion in a 15mm straight butt weld? *

a TIG weld, single-sided, multi-pass.

b MMA weld, single-sided, multi-pass.

c MMA weld, double-sided, multi-pass.

d SAW weld, 1 pass per side.

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20. A suitable gas/gas mixture for GMAW of aluminium is: 2/2

a 100%CO2.

b 100% Argon.

c 80% argon + 20% CO2.

d 98% argon + 2% O2.

21 Which of the following is associated with SAW more often than it is 2/2
with MMA welds?

a Hydrogen cracking in the HAZ.

b Solidification cracking in the weld metal.

c Reheat cracking during PWHT.

d Lamellar tearing.

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22 EN ISO 5817 (Level C) specifies that the limit for the diameter (D) of a 2/2
single pore in a weld is: [D ≤ 0.3s, but max.4mm where s = material
thickness. For which of the following situations is the pore acceptable]? *

a s = 20mm, measured pore diameter = 5mm.

b s = 15mm, measured pore diameter = 4.5mm.

c s = 10mm, measured pore diameter = 3mm.

d s = 10mm, measured pore diameter = 3.5mm.

23 To measure arc voltage accurately it is recommended that the 2/2

voltmeter should be connected: *

a Across the arc and as near as practical to the arc.

b Across the power source terminals prior to arc initiation.

c Across the power source terminals during the welding operation.

d Anywhere in the circuit.

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24 Lamellar tearing has occurred in a steel fabrication. What technique 2/2

could have been used to find it before the weld was made? *

a X-ray examination.

b Liquid penetrant examination.

c Ultrasonic examination.

d It could not have been found by any inspection method.

25 Preheating a low alloy steel prior to welding will minimise the risk of: * 2/2

a Porosity.

b Excessive distortion.

c HAZ cracking.

d Lack of fusion.

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26 Typical temperatures used for normalising a C-Mn steel plate are: * 2/2

a 600-650°C.

b 1000-1100°C.

c 700-800°C.

d 880-920°C.

27 For GMAW the burn-off rate of the wire is directly related to: * 2/2

a Stick out length.

b Wire feed speed.

c Arc voltage.

d Travel speed.

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28 When MMA welding a 60mm wall nozzle to a 100mm wall vessel shell, 2/2
preheat temperature should be checked: *

a Before welding starts/re-starts.

b On the shell and nozzle.

c At points at least 75mm from the joint edge.

d All of the above.

29 A crack running along the centreline of a weld bead could be caused 2/2
by: *

a Use of damp flux.

b Lack of preheat.

c Arc voltage too high.

d Weld bead too deep and very narrow.

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30 To improve resistance to service failure caused by cyclic loading, it is 2/2

good practice to: *

a Use low heat input welding.

b Use steel with a low CEV.

c Ensure there are no features that give high stress concentration.

d PWHT the fabrication.

31 The use of low carbon austenitic stainless steels and stabiliser 2/2
stainless steels will minimise the risk of: *

a HAZ cracking.

b Weld decay.

c Weld metal cracking.

d Distortion.

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32 Which type of SAW flux is susceptible to breaking down into fine 2/2
particles during circulation? *

a Fused.

b Neutral.

c Alloyed.

d Agglomerated.

33 The maximum hardness in the HAZ of a steel will increase if: * 2/2

a Heat input is increased.

b CEV is increased.

c Joint thickness is decreased.

d Basic electrodes are used.

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34 BS EN ISO 5817 (Level B) specifies the limit for excess weld metal (h) 2/2
on a buttweld as: [h ≤ 1mm + 0.1b, but max. 5mm, b = weld width.In which
of the following situations is the measured excess weld metal
acceptable] *

a b = 10 measured excess weld metal = 2.5mm.

b b = 20 measured excess weld metal = 3.5mm.

c b = 35 measured excess weld metal = 4.5mm.

d b = 45 measured excess weld metal = 5.5mm.

35 A C-Mn steel is being welded by MMA and the electrode run-out 2/2
lengths that havebeen used are much shorter than specified by the WPS.
This deviation may give: *

a Increased risk of hydrogen cracking.

b Increased risk of solidification cracking.

c Lower values of HAZ toughness.

d Higher values of HAZ hardness.

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36 The first procedure prepared for a Weld Procedure Qualification test 2/2
weld is a: *

a pWPS.

b WPS.

c WPQR.

d WPAR.

37 Transfer of material identification by hard stamping is sometimes not 2/2

allowed for high integrity applications because it: *

a Is too slow.

b Can be a safety hazard.

c May damage the material.

d Causes problems with coating operations.

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38 When welding thin plate distortion can be minimised by: * 2/2

a Welding from both sides.

b Using U preparations rather than V types.

c Using strongbacks.

d Using back-step welding.

39 Which of the following would be considered to be high heat input 2/2

welding? *

a 550J/mm.

b 55J/mm.

c 5.5J/mm.

d 5kJ/mm.

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40 Initiation of a TIG arc using a high frequency spark may not be 2/2
allowed because it: *

a Often causes tungsten inclusions.

b Can damage electronic equipment.

c Is an electrical safety hazard.

d Often causes stop/start porosity.

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41 Which of these drawing symbols shows weld penetration depth in 2/2

accordance with BS EN 22553? *

A B

C D

Mục khác:

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42 BS EN 288 and BS EN ISO 15614 are specifications for: * 2/2

a Welder approval testing.

b Welding equipment calibration.

c Welding procedure approval.

d Consumables for submerged arc welding.

43 What determines the penetrating power of gamma rays? * 2/2

a Time.

b Type of isotope.

c Source-to-film distance.

d Source strength.

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44 Which element has the greatest effect on the HAZ hardness of C-Mn 2/2
steel? *

a Molybdenum.

b Chromium.

c Titanium.

d Carbon.

45 Preheating a steel plate with a carbon equivalent value (CEV) of 0.48 2/2
may be required to: *

a Drive moisture from the plate.

b Prevent excessive hardening in the HAZ.

c Prevent the formation of carbides.

d Improve the mechanical properties of the weld metal.

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46 A welder approval certificate should be withdrawn if: * 2/2

a He has not done any welding for four months.

b He has been absent from work for seven months.

c The repair rate for his welds exceeds 1%.

d His work has been examined by UT only.

47 In friction welding, the metal at the interface when the joining occurs 2/2
is described as being in the:

a Liquid state.

b Intercritical state.

c Plastic state.

d Elastic state.

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48 A penetrameter (IQI) is used to measure the: * 2/2

a Size of discontinuity in a weld joint.

b Density of a radiographic film.

c Degree of film contrast.

d Quality of the radiographic technique.

49 Which of the following cutting methods is suitable for cutting 2/2

stainless steel? *

a Plasma.

b Oxy-acetylene.

c Oxy-propane.

d It depends upon the thickness.

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50 Which of the following would be classed as the most serious type of 2/2
defect? *

a A buried linear slag inclusion.

b Buried lack of inter-run fusion.

c Surface-breaking lack of sidewall fusion.

d Surface porosity.

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