Module 14 heat treatment

Question 1

The extent of the change of the green structure in the heat affected zone depends upon
A) the temperature to which the metal is subjected
B) the composition of the steel
C) rate of cooling
D) all of the above

Answer 1

D) all of the above

Question 2

Which of the listed heat treatments alters the grain structure of the well deposit and heat affected zone
A) stress relief
B) tempering
C) normalizing
D) preheating

Answer 2

C) normalizing

Question 3

Temperature refers to the
A) intensity of heat
B) amount of heat
C) volume of heat
D) quality of heat

Answer 3

A) intensity of heat

Question 4

The movement of heat within the body of a material is called:
A) radiation
B) conduction
C) convection
D) transference

Answer 4

B) conduction

Question 5

The transfer of heat from one body to another is called
A) radiation
B) conduction
C) convection
D) transference

Answer 5

C) convection

Question 6

The movement of heat and air is called
A) radiation
B) conduction
C) convection
D) transference

Answer 6

A) radiation

Question 7

The rate of thermal conductivity refers to the:
A) melting temperature of a metal
B) BTU output of an oxy welding tip
C) speed it he travels within a material
D) time required to melt through the metal

Answer 7

C) speed it he travels within a material

Question 8

The material that requires the lowest heat input for welding because of its poor thermal conductivity is
A) mild steel
B) brass
C) aluminum
D) copper

Answer 8

A) mild steel

Question 9

The material that requires the greatest heat input for welding because of its high thermal conductivity is:
A) aluminum
B) mild steel
C) stainless steel
D) cast-iron

Answer 9

A) aluminum

Question 10

Restrained expansion of metal when it is heated results in:
A) internal cracking
B) dimensional upset
C) internal stress
D) surface hardening

Answer 10

B) dimensional upset

Question 11

Unrestrained expansion and contraction of metal when it is heated and allowed to cool slowly produces:
A) internal cracking
B) dimensional upset
C) no appreciable change
D) surface hardening

Answer 11

C) no appreciable change

Question 12

The dimensional upset that occurs when expansion is restrained maybe used to good advantage to
A) remove broken studs
B) use jigs and fixtures
C) remove access weld reinforcement
D) weld around the neutral access

Answer 12

A) remove broken studs

Question 13

What is the result of welding a section when both expansion and contraction are restrained
A) excessive warping
B) loss of dimensions
C) very high stress
D) good sound weld

Answer 13

C) very high stress

Question 14

On which of the following jobs would expansion and contraction work in your favour?
A) welding, a joint subject to a high degree of restraint
B) when repairing an exhaust manifold
C) when repairing these on a flywheel
D) welding, aluminum tire rims

Answer 14

C) when repairing these on a flywheel

Question 15

Preheating heavy sections can help:
A) prevent well bead cracking
B) increase internal stress
C) increase tensile strength
D) produce a fine green structure

Answer 15

A) prevent well bead cracking

Question 16

Metals that are to be welded, and that are low inductivity are usually preheated in order to:
A) promote fine green size
B) slow the quench rate
C) improve the hardenability
D) increase welding stress

Answer 16

B) slow the quench rate

Question 17

Which of the following cannot be accomplished with a post welded heat treatment?
A) annealing
B) normalizing
C) stress relieving
D) distortion control

Answer 17

D) distortion control

Question 18

What is the soaking time required to stress relieve a steel weldment that is 1 inch thick?
A) one hour
B) two hours
C) three hours
D) four hours

Answer 18

A) one hour

Question 19

The annealing of a steel fabrication should:
A) decrease distortion
B) increase hardness
C) decrease ductility
D) decrease tensile strength

Answer 19

D) decrease tensile strength

Question 20

What effect is preheating have on a steel weld mount?
A) it increases tensile strength and ductility
B) it decreases tensile strength and ductility
C) it increases tensile strength, and decreases ductility
D) decreases tensile strength and increases ductility

Answer 20

D) decreases tensile strength and increases ductility

Question 21

The heat treating process that brings a material to its softest toughest weakest state is:
A) annealing
B) normalizing
C) stress relieving
D) Tempering

Answer 21

A) annealing

Question 22

Heating steel above its upper critical temperature and cooling in still air, describes a heat treatment known as:
A) annealing
B) normalizing
C) stress relieving
D) tempering

Answer 22

B) normalizing

Question 23

The temperature range for stress relieving is
A) 870°C (1600°F) to 980°C (1800°F)
B) 760°C (1400°F) to 870°C (1600°F)
C) 595°C (1100°F) to 700°C (1300°F)
D) 425°C (800°F) to 535°C (1000°F)

Answer 23

C) 595°C (1100°F) to 700°C (1300°F)

Question 24

Tempering is a___________ process.
A) case hardening
B) preheating
C) hardening
D) toughening

Answer 24

D) toughening

Question 25

To produce green structure, uniformity throughout the weldment and critical areas you would:
A) temper
B) stress relief
C) normalize
D) preheat

Answer 25

C) normalize

Question 26

Heating above the upper critical temperature followed by a rapid quench describes:
A) stress relieving
B) normalizing
C) tempering
D) hardening

Answer 26

D) hardening

Question 27

Heating below the lower critical temperature, followed by a rapid quench describes:
A) stress relieving
B) normalizing
C) tempering
D) annealing

Answer 27

C) tempering

Question 28

A temperature indicating crayon marked at 150°C (300°F) is used for:
A) hardening
B) preheating
C) stress relieving
D) annealing

Answer 28

B) preheating

Question 29

Which of the following is a temperature sensing device
A) thermograph
B) inclinometer
C) barometer
D) pyrometer

Answer 29

D) pyrometer