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CWI Prep Tests > M6: HEAT TREATMENT > Flashcards

M6: HEAT TREATMENT Flashcards

Welding Heat Treatment and Processes parameter

1
Q

Q6-1 As a metal is heated:

a. energy is added to the structure.
b. the atoms move farther apart.
c. the atoms vibrate more vigorously.
d. the metal expands.
e. all of the above

A

Q6-1 As a metal is heated:

E. all of the above

a. energy is added to the structure.
b. the atoms move farther apart.
c. the atoms vibrate more vigorously.
d. the metal expands.

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2
Q

Q6-2 The state of matter which exhibits the least amount of energy is:

a. solid
b. liquid
c. gas
d. quasi-liquid
e. none of the above

A

Q6-2 The state of matter which exhibits the least amount of energy is:

A. solid

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3
Q

Q6-3 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 –

A

Q6-3 A problem occurring in weldments caused by the nonuniform heating produced by the welding operation is:

C. distortion

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4
Q

Q6-4 All but which of the following will result in the elimination or reduction of residual stresses?

a. vibratory stress relief
b. external restraint
c. thermal stress relief
d. peening
e. postweld heat treatment

A

Q6-4 All but which of the following will result in the elimination or reduction of residual stresses?

B. external restraint

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5
Q

Q6-5 Steel exists in which of the following crystal arrangements?

a. HCP
b. FCC
c. BCC
d. a and b above
e. b and c above

A

Q6-5 Steel exists in which of the following crystal arrangements?

E. b and c above

b. FCC
c. BCC

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6
Q

Q6-6 Rapid cooling of a steel from the austenitic range results in a hard, brittle structure known as:

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

A

Q6-6 Rapid cooling of a steel from the austenitic range results in a hard, brittle structure known as:

E. martensite

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7
Q

Q6-7 Very slow cooling of steel may result in the production of a soft, ductile micro structure which has a lamellar appearance when viewed under high magnification. This structure is referred to as:

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

A

Q6-7 Very slow cooling of steel may result in the production of a soft, ductile micro structure which has a lamellar appearance when viewed under high magnification. This structure is referred to as:

B. pearlite

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8
Q

Q6-8 When rapid cooling produces a martensitic structure, what non-austenitizing heat treatment may be applied to improve the ductility of the steel?

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

A

Q6-8 When rapid cooling produces a martensitic structure, what non-austenitizing heat treatment may be applied to improve the ductility of the steel?

B. tempering

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9
Q

Q6-9 The use of preheat will tend to:

a. result in a wider heat affected zone
b. produce a lower heat affected zone hardness
c. slow down the cooling rate
d. reduce the tendency of producing martensite in the heat affected zone
e. all of the above

A

Q6-9 The use of preheat will tend to:

E. all of the above

a. result in a wider heat affected zone
b. produce a lower heat affected zone hardness
c. slow down the cooling rate
d. reduce the tendency of producing martensite in the heat affected zone

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10
Q

Q6-10 Which of the following changes will warrant the addition or increase in the required preheat?

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

A

Q6-10 Which of the following changes will warrant the addition or increase in the required preheat?

E. b and c above

b. increased carbon equivalent
c. increased base metal thickness

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11
Q

Q6-11 What heat treatment is characterized by holding the part at the austenitizing temperature for some time and then slow cooling in the furnace?.

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

A

Q6-11 What heat treatment is characterized by holding the part at the austenitizing temperature for some time and then slow cooling in the furnace?.

C. annealing

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12
Q

Q6-12 What heat treatment is characterized by holding the part at the austenitizing temperature for some time and then slow cooling in still air?

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

A

Q6-12 What heat treatment is characterized by holding the part at the austenitizing temperature for some time and then slow cooling in still air?

A. normalizing

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13
Q

Q6-13 Increasing the heat input:

a. decreases the cooling rate and increases the likelihood of cracking problems.
b. decreases the cooling rate and decreases the likelihood of cracking problems.
c. increases the cooling rate and increases the likelihood of cracking problems.
d. increases the cooling rate and decreases the likelihood of cracking problems.
e. none of the above

A

Q6-13 Increasing the heat input:

B. decreases the cooling rate and decreases the likelihood of cracking problems.

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14
Q

Q6-14 Increasing preheat:

a. decreases the cooling rate and increases the likelihood of cracking problems.
b. decreases the cooling rate and decreases the likelihood of cracking problems.
c. increases the cooling rate and increases the likelihood of cracking problems.
d. increases the cooling rate and decreases the likelihood of cracking problems.
e. none of the above

A

Q6-14 Increasing preheat:

B. decreases the cooling rate and decreases the likelihood of cracking problems.

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15
Q

Q6-15 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

A

Q6-15 Increasing the carbon content:

B. increases the likelihood of cracking problems.

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16
Q

Q6-16 Which of the following generally follows quenching?

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

A

Q6-16 Which of the following generally follows quenching?

D. tempering

17
Q

Q6-17 Which of the following can be accomplished using either thermal or mechanical techniques?

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

A

Q6-17 Which of the following can be accomplished using either thermal or mechanical techniques?

E. stress relief

18
Q

Q6-18 Which of the following results in the softest structure for steel?

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

A

Q6-18 Which of the following results in the softest structure for steel?

A. annealing

19
Q

Q6-19 For a steel having the following composition: 0.11 carbon, 0.65 manganese, 0.13 chromium, 0.19 nickel, 0:005 copper, and 0.07 molybdenum, what is its carbon equivalent using the following formula?

CE = %C + %Mn/6 + %Ni/15 + %Cr/5 + %Cu/13 + %Mo/4

a. 0.15
b. 0.23
c. 0.28
d. 0.31
e. 0.42

A

Q6-19 For a steel having the following composition: 0.11 carbon, 0.65 manganese, 0.13 chromium, 0.19 nickel, 0:005 copper, and 0.07 molybdenum, what is its carbon equivalent using the following formula?

CE = %C + %Mn/6 + %Ni/15 + %Cr/5 + %Cu/13 + %Mo/4

C. 0.28

20
Q

Q6-20 For a steel having the following composition: 0.16 carbon, 0.85 manganese, 0.25 chromium, 0.09 nickel, 0.055 copper, and 0.41 molybdenum, what is its carbon equivalent using the following formula?

CE = %C + %Mn/6 + %Ni/15 + %Cr/5 + %Cu/13 + %Mo/4

a. 0.23
b. 0.31
c. 0.34
d. 0. 41
e. 0.46

A

Q6-20 For a steel having the following composition: 0.16 carbon, 0.85 manganese, 0.25 chromium, 0.09 nickel, 0.055 copper, and 0.41 molybdenum, what is its carbon equivalent using the following formula?

CE = %C + %Mn/6 + %Ni/15 + %Cr/5 + %Cu/13 + %Mo/4

E. 0.46

21
Q

Q6-21 The FCAW process is being utilized to weld a 1 inch thick structural steel member to a building column. The welding is being done with a 3/32 inch diameter self-shielded electrode with a 150° minimum preheat and interpass temperature. The welding parameters are adjusted to 30 volts, 250 amperes and 12 in/min. What is the heat input?
FORMULA: Heat Input (J/in) = Amperage x Voltage x 60 Travel S peed (in/min).

a. 375 J/in
b. 37,500 J/in
c. 375 kJ/m
d. a and b above
e. b and c above

A

Q6-21 The FCAW process is being utilized to weld a 1 inch thick structural steel member to a building column. The welding is being done with a 3/32 inch diameter self-shielded electrode with a 150° minimum preheat and interpass temperature. The welding parameters are adjusted to 30 volts, 250 amperes and 12 in/min. What is the heat input?

B. 37,500 J/in

22
Q

Q6-22 GMAW (short circuiting) welds are produced at 18 volts, 100 amperes and 22 in/min. What is the heat input?
FORMULA: Heat Input (J/in) = Amperage x Voltage x 60 Travel S peed (in/min).

a. 238 J/in
b. 7333 J/in
c. 4909 J/in
d. 30 J/in
e. none of the above

A

Q6-22 GMAW (short circuiting) welds are produced at 18 volts, 100 amperes and 22 in/min. What is the heat input?

C. 4909 J/in

23
Q

Q6-23 The GMAW process is mechanized for welding 1/8″ thick stainless steel sheets against a copper backing bar. The process is operated at 300 amperes, 28 volts and 15 in/min. What is the resulting heat input?
FORMULA: Heat Input (J/in) = Amperage x Voltage x 60 Travel S peed (in/min).

a. 650 kJ/in
b. 650,000 J/in
c. 165,000 J/in
d. 16,500 J/in
e. none of the above

A

Q6-23 The GMAW process is mechanized for welding 1/8″ thick stainless steel sheets against a copper backing bar. The process is operated at 300 amperes, 28 volts and 15 in/min. What is the resulting heat input?

E. none of the above

24
Q

Q6-24 The GTAW process is being used for welding 1/16″ thick titanium using DCEN at 110 amperes, 15 volts and 6 in/min. What is the heat input?
FORMULA: Heat Input (J/in) = Amperage x Voltage x 60 Travel S peed (in/min).

a. 21 000 J/in
b. 21 kJ/in
c. 16,500 J/in
d. a and b above
e. b and c above

A

Q6-24 The GTAW process is being used for welding 1/16″ thick titanium using DCEN at 110 amperes, 15 volts and 6 in/min. What is the heat input?

C. 16,500 J/in

25
Q

Key:

A

e1
a2
c3
b4

e5
e6
b7
b8

e9
e10
c11
a12

b13
b14
b15
d16

e17
a18
c19
e20

b21
c22
e23
c24

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