Model Question Paper

Welding Inspection: 1.

Multi-Choice Questions

Paper 4

(Rev. 3)

Which of these drawing symbols shows weld penetration depth in accordance with BS EN 22553?

10s

A 10s s10

B

C

10s

s10

D

2.

BS EN 288 & BS EN ISO 15614 are specifications for....... A B C D

3.

What determines the penetrating power of Gamma rays? A B C D

4.

Molybdenum Chromium Titanium Carbon

Pre-heating a steel plate with a carbon equivalent value (CEV) of 0.48 may be required in order to ........ A B C D

6.

time type of isotope source-to-film distance source strength

Which element has the greatest effect on the HAZ hardness of carbon-manganese steel? A B C D

5.

welder approval testing welding equipment calibration welding procedure approval consumables for submerged arc welding

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A welder approval certificate should be withdrawn if .........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

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% his work has been examined by UT only

1 Copyright  2007, TWI Ltd

world centre for materials joining technology

Welding Inspection:

Multi-Choice Questions

Paper 4

(Rev. 3)

7.

In friction welding, the metal at the interface when the joining occurs is described as being in the ..........

8.

A liquid state B inter-critical state C plastic state D elastic state A penetrameter (IQI) is used to measure ......... A B C D

9.

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 it depends upon the thickness

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

lack of sidewall fusion root undercut incompletely filled groove root concavity

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 higher strength

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

the critical transformation temperature the ductility dip temperature the bi-modal temperature the transition temperature 2

Copyright  2007, TWI Ltd

world centre for materials joining technology

Welding Inspection:

Multi-Choice Questions

Paper 4

(Rev. 3)

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 may change the mechanical properties of the joint B may adversely affect the quality of the weld C will require a new welding procedure to be approved D 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

tensile ductility notch toughness fatigue strength creep resistance

20. During PWHT of a complex fabrication, it is heated to the soak temperature at a much faster 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

the material may be contaminated access to repair area may be difficult positional welding may be needed all of the above may be factors 3

Copyright  2007, TWI Ltd

world centre for materials joining technology

Welding Inspection:

Multi-Choice Questions

Paper 4

(Rev. 3)

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 the source/tube to work “stand-off” distance 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 giving high deposition rate

29. Carbon equivalent values (CEV) are used to determine the how to avoid the risk of ........ A B C D

hydrogen cracking lamellar tearing solidification cracking weld decay

30. When 2 different material types are welded together, the joint is referred to as ........ A B C D

a composite joint a transition joint an autogenous weld heterogeneous joint 4

Copyright  2007, TWI Ltd

world centre for materials joining technology