MCQs on Welding with answer

1          For which of the following is pre-heating most likely to be required?

a)                  Austenitic stainless steels

b)                  High strength alloy steels

c)                  Low and medium strength steels

d)                 Low carbon steels

Answer:    b)       High strength alloy steels

2          Manual metal arc welding of low alloy steels is more likely to be performed with:

a)                  Rutile electrodes

b)                  Cellulosic Electrodes

c)                  Iron powder electrodes

d)                 Basic hydrogen controlled electrodes

3          which of the following defects is more common to weld deposited by the

CO-2 welding process than weld deposited by manual metal arc?

           

a)                  Slag inclusion

b)                  Excess penetration

c)                  Lack of side fusion

d)                 Tungsten inclusions

4          Which defect would you expect to obtain in TIG welds in non-deoxidized steel?

a)                  Under cut

b)                  Porosity

c)                  Tungsten inclusions

d)                 Linear misalignment

5          Which of the following can arise from copper inclusions is a ferrite steel weld?

           

a)                  Weld metal cracks

b)                  HAZ cracks

c)                  Lamellar tearing

d)                 Porosity

6          Which of the following is likely to give the highest impact strength in ferritic weld metal?

a)                  Cellulosic electrodes

b)                  Submerged arc with acid flux

c)                  Spray transfer Co-2-welding

d)                 Basic coated normal metal arc electrodes

7          Which of the following methods of NDT would be most likely to detect lack of side fusion in ferritic steel welds?

           

a)                  Penetrants

b)                  Magnetic particles

c)                  Radiography

d)                 Ultrasonic flaw detector

8          You suspected that ferritic steel plates, which have been edge, prepared contain crack in the prepared edges. Which NDT method would you use to check this?

a)                  Radiography

b)                  Magnetic particle

c)                  Penetrants

d)                 Ultrasonic flaw detector

9          Which of the following defects do you not expect to find by visual examination of completed welds?           

a)                  Linear slag inclusions

b)                  Under cuts

c)                  Overlap

d)                 Linear misalignment

10        Stress relief is not helpful in one of the following cases. Which one?

a)                  In improving resistance to stress corrosion cracking

b)                  In dimensional stability after machining improving

c)                  In lowering the peak residual stress

d)                 In softening the steel