Deck 27: Welding Metallurgy

Question 1

Alloy systems that show a partial solubility in the solid phase generally have very high solubility at room temperature.

Answer 1

False

Question 2

We can tell the temperature of an object by the frequency of the light its vibrating atoms produce.

Answer 2

True

Question 3

____ is the principal cause of porosity in aluminum welds and with GMAW welds on stainless steels.

A) Nitrogen
B) Hydrogen
C) Oxygen
D) Carbon dioxide

Answer 3

B

Question 4

Temperature is the quantity of thermal energy, and heat is the level of thermal activity.

Question 5

____ involves heating the structure of a metal to a high enough temperature to turn it completely austenitic.

A) Normalizing
B) Preheating
C) Stress relieving
D) Annealing

Question 6

____ is used to reduce the rate at which welds cool.

A) Preheat
B) Annealing
C) Normalizing
D) Stress relieving

Question 7

Both crystalline and amorphic materials look and feel like solids, so without sophisticated testing equipment, you cannot tell the difference between them.

Question 8

____ consists of heating steels to slightly above a specific temperature and holding for austenite to form, then followed by cooling (in still air).

A) Normalizing
B) Preheating
C) Annealing
D) Stress relieving

Question 9

Sensible heat is absorbed by a material as it changes from a solid to a liquid state and from a liquid to a gaseous state.

Question 10

____ is the ability of a metal to be permanently twisted, drawn out, bent, or changed in shape without cracking or breaking.

A) Toughness
B) Hardness
C) Ductility
D) Brittleness

Question 11

All metals have the ability to have their properties altered by some form of heat treatment.

Question 12

The final individual crystal size within the metal depends on the length of time that the material is at the crystal-forming temperature and any obstructions to its growth.

Question 13

____ is the property that allows a metal to withstand forces, sudden shock, or bends without fracturing.

A) Hardness
B) Toughness
C) Brittleness
D) Ductility

Question 14

A material can have a large quantity of heat energy in it, but the material can be at a low temperature.

Question 15

____ consists of heating to a point below the lower transformation temperature where new grain growth would occur and holding it for a sufficiently long period to relieve locked-up stresses, then slowly cooling.

A) Preheating
B) Normalizing
C) Stress relieving
D) Annealing

Question 16

____ strength is the property of a material to resist being crushed.

A) Shear
B) Torsional
C) Ultimate
D) Compressive

Question 17

____ strength is the property of a material to withstand a twisting force.

A) Ultimate
B) Torsional
C) Compressive
D) Shear

Question 18

____ is the ease with which a metal will crack or break apart without noticeable deformation.

A) Brittleness
B) Ductility
C) Hardness
D) Toughness

Question 19

Cold cracks are caused by tearing the metal along partially fused grain boundaries of welds that have not completely solidified.

Question 20

Ductility is the ability of a material to return to its original form after removal of the load.

Question 21

A(n) ____________________ is the lowest possible melting temperature of an alloy.

Question 22

____________________ is the process of reheating a part that has been hardened through heating and quenching.

Question 23

____________________ is the result of hydrogen dissolving in the weld metal and then diffusing into the heat-affected zone.

Question 24

____________________ materials have no orderly arrangement of their atoms into crystals.

Question 25

To obtain a fine-grained structure, the metal must be heated quickly above the critical temperature and cooled quickly in a process called ____________________.