(8) WELDING METALLURGY FOR THE WELDING INSPECTOR Flashcards

1
Q

Q8-1

As a metal is heated:

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

A

Q8-1

As a metal is heated:

E. all of the above

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

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2
Q

Q8-2

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

Q8-2

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

a. solid

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3
Q

Q8-3 A problem occurring in weldments caused by the non-uniform heating produced by the welding operation is:

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

A

Q8-3

A problem occurring in weldments caused by the non-uniform heating produced by the welding operation is:

c. distortion

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4
Q

Q8-4

Which of the following is not a method used to eliminate or reduce residual stresses?

a. vibratory stress relief
b. external restraint
c. thermal stress relief
d. peening
e. annealing

A

Q8-4

Which of the following is not a method used to eliminate or reduce residual stresses?

b. external restraint

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5
Q

Q8-5

The type of alloying in which the alloy atoms are located in the spaces between the atoms of the parent metal is referred to as:

a. atomic alloying
b. substitutional alloying
c. space alloying
d. interstitial alloying
e. none of the above

A

Q8-5

The type of alloying in which the alloy atoms are located in the spaces between the atoms of the parent metal is referred to as:

d. interstitial alloying

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6
Q

Q8-6

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

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

A

Q8-6

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

e. martensite

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7
Q

Q8-7

Very slow cooling of steel may result in the production of a soft, ductile microstructure 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

Q8-7

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

b. pearlite

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8
Q

Q8-8

When rapid cooling produces a martensitic structure, what sub-critical 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

Q8-8

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

b. tempering

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9
Q

Q8-9

It is determined that a welding procedure is creating an excessive heat input. Which of the changes listed below would result in a reduction of the heat input?

a. decrease current
b. decrease voltage
c. increase travel speed
d. change from weave to stringer bead technique
e. all of the above

A

Q8-9

It is determined that a welding procedure is creating an excessive heat input. Which of the changes listed below would result in a reduction of the heat input?

E. all of the above

a. decrease current
b. decrease voltage
c. increase travel speed
d. change from weave to stringer bead technique

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10
Q

Q8-10

The use of preheat will tend to:

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

A

Q8-10

The use of preheat will tend to:

E. all of the above

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

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11
Q

Q8-11

Which of the following changes will warrant an 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

Q8-11

Which of the following changes will warrant an 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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12
Q

Q8-12

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

Q8-12

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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13
Q

Q8-13

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

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

A

Q8-13

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

a. normalizing

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14
Q

Q8-14

Steel heated above the lower transformation temperature (A1) will change metallurgical structure. This temperature is:

a. 1333°F
b. 933°F
c. 1560°F
d. 3600°C
e. none of the above

A

Q8-14

Steel heated above the lower transformation temperature (A1) will change metallurgical structure. This temperature is:

a. 1333°F

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15
Q

Q8-15

Atoms in the solid (frozen) state:

a. have a specific “home” position
b. have no distinct structure
c. are essentially fixed in a definite structured position
d. a and c above
e. none of the above

A

Q8-15

Atoms in the solid (frozen) state:

D. a and c above

a. have a specific “home” position
c. are essentially fixed in a definite structured position

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16
Q

Q8-16

What is the heat input for a molten weld pool at 5 ipm travel speed, 25 volts, and 100 amperes? (Refer to page 10-8 for Formula)

a. 300 J/in
b. 300 000 J/in
c. 30 000 J/in
d. 3.633 J/in
e. none of the above

A

Q8-16

What is the heat input for a molten weld pool at 5 ipm travel speed, 25 volts, and 100 amperes? (Refer to page 10-8 for Formula)

c. 30 000 J/in

17
Q

Q8-17

One way that atoms are added to a pure metal to form an alloy is:

a. peening
b. substitutionally
c. automatically
d. solidification
e. sensitizing

A

Q8-17

One way that atoms are added to a pure metal to form an alloy is:

b. substitutionally

18
Q

Q8-18

The process where carbon is added to the surface of a steel to harden it is:

a. decarburization
b. pack carburizing
c. precipitation hardening
d. quenching
e. none of the above

A

Q8-18

The process where carbon is added to the surface of a steel to harden it is:

b. pack carburizing

19
Q

Q8-19

Steel exists in which of the following crystal structures?

a. HCP
b. FCC
c. BCC
d. all of the above
e. BCT

A

Q8-19

Steel exists in which of the following crystal structures?

D. all of the above

a. HCP
b. FCC
c. BCC

20
Q

Q8-20

Which of the following usually follows quenching?

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

A

Q8-20

Which of the following usually follows quenching?

a. tempering

21
Q

Q8-21

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

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

A

Q8-21

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

d. stress relieving

22
Q

Q8-22

Which of the following results in the softest condition for carbon steel?

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

A

Q8-22

Which of the following results in the softest condition for carbon steel?

a. annealing

23
Q

Q8-23

For a steel having a chemical composition of: 0.16% carbon, 0.84% manganese, 0.09% nickel, 0.25% chromium, 0.052% copper, and 0.40% molybdenum, what is its Carbon Equivalent?

a. 0.23
b. 0.34
c. 0.37
d. 0.41
e. 0.46

A

Q8-23

For a steel having a chemical composition of: 0.16% carbon, 0.84% manganese, 0.09% nickel, 0.25% chromium, 0.052% copper, and 0.40% molybdenum, what is its Carbon Equivalent?

e. 0.46

24
Q

Q8-24

Stainless steels are defined as having at least what percent chromium?

a. 7%
b. 12%
c. 15%
d. 20%
e. 30%

A

Q8-24

Stainless steels are defined as having at least what percent chromium?

b. 12%

25
Q

Q8-25

Sensitization, or carbide precipitation, of austenitic stainless steels can be reduced by which of the following methods?

a. solution annealing, water quenching
b. using stabilized grades containing titanium or niobium (columbium)
c. using the low carbon grades of stainless steels
d. all of the above
e. using high carbon stainless steels

A

Q8-25

Sensitization, or carbide precipitation, of austenitic stainless steels can be reduced by which of the following methods?

D. all of the above

a. solution annealing, water quenching
b. using stabilized grades containing titanium or niobium (columbium)
c. using the low carbon grades of stainless steels

26
Q

Q8-26

Metals must be molten for diffusion to occur.

a. true
b. false

A

Q8-26

Metals must be molten for diffusion to occur.

b. false

27
Q

Q8-27

Hydrogen can diffuse into a solid metal at room temperature.

a. true
b. false

A

Q8-27

Hydrogen can diffuse into a solid metal at room temperature.

a. true

28
Q

Q8-28

Metals can diffuse into each other when both are in the solid form.

a. true
b. false

A

Q8-28

Metals can diffuse into each other when both are in the solid form.

a. true

29
Q

Q8-29

The process whereby nitrogen diffuses into the surface of carbon steel is:

a. sensitization
b. nitrogen removal
c. carburizing
d. nitriding
e. none of the above

A

Q8-29

The process whereby nitrogen diffuses into the surface of carbon steel is:

d. nitriding

30
Q

Q8-30

Welding metallurgy is concerned with the changes in the metals during welding.

a. true
b. false

A

Q8-30

Welding metallurgy is concerned with the changes in the metals during welding.

a. true

31
Q

2008 ANSWER KEY—CHAPTER 8

A

ANSWER KEY—CHAPTER 8
Q8-1 e (pg. 8-2, 8-3)
Q8-2 a (pg. 8-3)
Q8-3 c (pg. 8-13)
Q8-4 b (pg. 8-14)
Q8-5 d (pg. 8-5)
Q8-6 e (pg. 8-8)
Q8-7 b (pg. 8-7)
Q8-8 b (pg. 8-9)
Q8-9 e (pg. 8-9, 8-10)
Q8-10 e (pg. 8-10)
Q8-11 e (pg. 8-12)
Q8-12 c (pg. 8-13)
Q8-13 a (pg. 8-13)
Q8-14 a (pg. 8-6)
Q8-15 d (pg. 8-3)
Q8-16 c (pg. 8-9)
Q8-17 b (pg. 8-6)
Q8-18 b (pg. 8-16)
Q8-19 d (pg. 8-4)
Q8-20 a (pg. 8-9)
Q8-21 d (pg. 8-13, 8-14)
Q8-22 a (pg. 8-13)
Q8-23 e (pg. 8-12)
Q8-24 b (pg. 8-16)
Q8-25 d (pg. 8-16, 8-17)
Q8-26 b (pg. 8-15)
Q8-27 a (pg. 8-15)
Q8-28 a (pg. 8-15)
Q8-29 d (pg. 8-16)
Q8-30 a (pg. 8-2)