Chapter 11: Weld And Base Metal Discontinuities

Question 1

A discontinuity is:

Answer 1

Rejectable if it exceeds code limits

Question 2

Of the following, which is commonly caused by the presence of hydrogen in a crack susceptible microstructure subjected to applied stress?

Answer 2

Delayed cracking

Question 3

Porosity, occurring in the form of large cylindrical pores is called:

Answer 3

Elongated porosity

Question 4

Which of the following discontinuities is least likely to be detected visually?

Answer 4

Lamellar tear

Question 5

Underbead cracks can result from which of the following welding practices?

Answer 5

Use of wet electrodes, welding on contaminated steels, welding over paint

Question 6

The weld discontinuity that results from improper termination of the welding arc is referred to as:

Answer 6

Crater crack

Question 7

All but which of the following processes may result in the presence of slag inclusions in the completed weld?

SMAW, PAW, FCAW, SAW

Answer 7

PAW

Question 8

That discontinuity that results from the entrapment of gas within the weld cross section is referred to as:

Answer 8

Porosity

Question 9

What base metal discontinuity, located at the weld toe, is caused by the welder traveling too rapidly?

Answer 9

Undercut

Question 10

What weld discontinuity results when the welder travels too slowly, which causes excess weld metal to pour out of the joint and lay on the base metal surface without fusing?

Answer 10

Overlap

Question 11

What weld metal discontinuity results when the welder fails to completely fill the weld groove?

Answer 11

Underfill

Question 12

Excessive weld metal buildup on a groove weld is referred to as:

Answer 12

Excess weld reinforcement

Question 13

The weld discontinuity that result from the initiation of the welding arc outside of the weld joint is referred to as:

Answer 13

Arc strike

Question 14

Of the following, which weld discontinuity shows up as a light region on a radiograph?

Answer 14

Tungsten Inclusion

Question 15

What base metal discontinuity results from improper steel making practice and is associated with the rolled surface?

Answer 15

Seam

Question 16

What discontinuity is shown by #12b?

Answer 16

Transverse crack

Question 17

What discontinuity is shown by #11?

Answer 17

Lamellar Tear

Question 18

What discontinuity is shown by #12g?

Answer 18

Underbead Crack

Question 19

What discontinuity is shown by #5?

Answer 19

Undercut

Question 20

What discontinuity is shown by #10?

Answer 20

Seam