Weldability, Welding Metallurgy, and Welding Chemistry

Question 1

A problem occurring in weldments caused by the nonuniform heating produced by the welding operation is:

a. porosity
b. incomplete fusion
c. distortion
d. slag inclusions
e. none of the above

Answer 1

c.distortion

Question 2

Rapid cooling of a steel from the austenitic range results in a hard, brittle structure known a:

a. pearlite
b. carbide
c. cementite
d. bainite
e. martensite

Answer 2

e. martensite

Question 3

Very slow cooling of steel may result in the production of a soft, ductile microstructure that has a lamellar appearance when viewed under high magnification. This structure is referred as:

a. martensite
b. pearlite
c. bainite
d. ferrite
e. cementite

Answer 3

b. pearlite

Question 4

When rapid cooling produces a martensitic structure, what nonaustenitizing heat treatment may be applied to improve the ductility of steel?

a. quenching
b. tempering
c. annealing
d. normalizing
e. none of the above

Answer 4

b. tempering

Question 5

Which of the following changes will warrant the addition of or increase in the required preheat?

a. decreased carbon equivalent
b. increased carbon equivalent
c. increased base metal thickness
d. both a and c above
e. both b and c above

Answer 5

e. both b an c above

Question 6

What heat treatment is characterized by holding the part at the austenitizing temp for some time and then slow cooling in the furnace?

a. normalizing
b. quenching
c. annealing
d. tempering
e. stress relief

Answer 6

c. annealing

Question 7

What heat treatment is characterized by holding the part at the austentizing temp for some time and then slow cooling in still air?

a. normalizing
b. quenching
c. annealing
d. tempering
e. stress relief

Answer 7

a. normalizing

Question 8

Which of the following generally follows quenching?

a. annealing
b. normalizing
c. quenching
d. tempering
e. stress relief

Answer 8

d. tempering

Question 9

Increasing the heat input:

Answer 9

e. none of the above

Question 10

Increasing the carbon content:

a. decreases the likelihood of cracking problems
b. increases the likelihood of cracking problems
c. has nothing to do with the likelihood of cracking problems
d. all of the above
e. none of the above

Answer 10

b. increases the likelihood of cracking problems

Question 11

Which of the following can be accomplished using either thermal or mechanical techniques?

a. annealing
b. normalizing
c. quenching
d. tempering
e. stress relief

Answer 11

e. stress relief

Question 12

Which of the following results in the softest structure for steel?

a. annealing
b. normalizing
c. quenching
d. tempering
e. stress relief

Answer 12

a. annealing