Weld and Base Metal Discontinuties

Question 1

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

a. lamellar tearing
b. delamination
c. porosity
d. delayed cracking
e. None

Answer 1

d. delayed cracking

Question 2

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

a. clustered porosity
b. linear scattered porosity
c. uniformly scattered porosity
d. elongated porosity
e. none

Answer 2

d. elongated porosity

Question 3

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

a. toe crack
b. undercut
c. lamellar tear
d. overlap
e. none

Answer 3

c. lamellar tear

Question 4

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

a. underfill
b. undercut
c. incomplete fusion
d. overlap
e. none

Answer 4

b. undercut

Question 5

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?

a. undercut
b. underfill
c. overlap
d. incomplete fusion
e. none

Answer 5

c. overlap

Question 6

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

a. underfill
b. undercut
c. overlap
d. incomplete fusion
e. none

Answer 6

a. underfill

Question 7

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

a. excess convexity
b. excess weld reinforcement
c. overfill
d. all
e none

Answer 7

b. excess weld reinforcement

Question 8

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

a. incomplete fusion
b. undercut
c. overlap
d. scratch start
e. arc strike

Answer 8

e. arc strike

Question 9

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

a. lamination
b. delamination
c. seam
d. crack
e. none

Answer 9

c. seam