drive out moisture from the plate prevent excessive hardening in the HAZ prevent the formation of carbides improve the mechanical properties of the weld metal
A welder approval certificate should be withdrawn if......... A B C D
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he has not done any welding for a period of 4 months he has been absent from work for a period of 7 months the repair rate for his welds exceeds 1% all of the above
Paper 4
Weldin g Inspectio n:
Multi-Choic e Questi ons
Paper 4 Please keep thi s p aper u nmarked 7.
In friction welding, the metal at the interface when the joining occurs is described as being in the.......... A B C D
8.
A penetrameter is used to measure......... A B C D
9.
liquid state inter-critical state plastic state elastic state
the size of a discontinuity in a weld joint the density of a radiographic film the degree of film contrast the quality of the radiographic technique
Which of the following cutting methods is suitable for cutting stainless steel? A B C D
plasma oxy-acetylene oxy-propane all of the above
10. Which of the following would be classed as the most serious type of defect? A B C D
a buried linear slag inclusion buried lack of inter-run fusion surface breaking lack of sidewall fusion surface porosity
11. Ultrasonic testing has an advantage over other NDT methods for the detection of........ A B C D
12. Exceeding the maximum inter-pass temperature specified for a C-Mn steel weld joint, may give....... A B C D
excessive porosity burn through lower toughness all of the above
13. MIG/MAG welding has a tendency to give lack of sidewall fusion when........ A B C D
spray transfer conditions are used 100%CO2 shielding gas is used pulsed current is used dip transfer conditions are used
14. The temperature range over which a steel goes from having high toughness to low toughness is called.... A B C D
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the critical transformation temperature the ductility dip temperature the bi-modal temperature the transition temperature
Paper 4
Weldin g Inspectio n:
Multi-Choic e Questi ons
Paper 4 Please keep thi s p aper u nmarked 15. For SAW, what is the effect of raising arc voltage but keeping with all other parameters the same? A B C D
the weld bead width will increase the depth of penetration will increase the weld bead width will decrease the depth of penetration will decrease
16. Changing an essential variable (beyond the allowed limits) for a qualified welding procedure........ A B C D
may change the mechanical properties of the joint may adversely affect the quality of the weld will require a new welding procedure to be approved all of the above
17. With reference to the various grades of stainless steels, which of the following statements is true? A B C D
they are all non-magnetic they all require 100% Ar for GMAW they all have very high thermal conductivity only certain grades can be used for service at very low temperatures
18. Which of the following AWS A5.1 electrodes has a rutile covering......... A B C D
E 6010 E 7016 E 7018 E 6013
19. Welds made with very high heat input will show a reduction in......... A B C D
20. During PWHT of a complex fabrication, it is heated to the soak temperature at a much higher rate than specified by the procedure. This may......... A B C D
cause excessive oxidation not allow sufficient time to relieve stresses introduce excessive compressive stresses cause distortion
21. When MAG welding in dip transfer mode (short-circuiting mode) spatter can be reduced by........... A B C D
using inductance using 100% CO2 using Ar + 30%He increasing the stick-out length
22. Repair welding of in-service plant and equipment may be more difficult than making repairs during initial fabrication because........ A B C D
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the material may be contaminated access to repair area may be difficult positional welding may be needed of any of the above
Paper 4
Weldin g Inspectio n:
Multi-Choic e Questi ons
Paper 4 Please keep thi s p aper u nmarked 23. For gamma radiography of a steel weld at 35mm thick, the recommended isotope is.......... A B C D
Thulium 170 Ytterbium 169 Iridium 192 Cobalt 60
24. The sensitivity of a radiograph is assessed ........ A B C D
by using a densitometer by using an image quality indicator ( IQI ) from the kVA used from stand-off used
25. A transverse tensile test, from a Weld Procedure Approval Record (WPAR) test plate, is used to measure...... A B C D
the tensile strength of the weld the tensile strength of the joint the stress/strain characteristics of the weld the stress/strain characteristics of the joint
26. The highest and lowest heat input positions are considered to be.......... A B C D
PB highest; PA lowest PE highest; PC lowest PD highest; PB lowest PF highest; PG lowest
27. What type of covering will an electrode have that is suitable for welding 60mm C-Mn steel and can give good weld metal toughness at -50°C? ....... A B C D
rutile basic cellulosic choice will depend on the welding position
28. The dip transfer mode (or short-circuiting mode) of metal transfer used for MIG/MAG welding is characterised by........ A B C D
giving deep penetration being suitable for positional welding giving low spatter all of the above
29. Carbon equivalent values (CEV) are used to determine the how to avoid the risk of........ A B C D
