Deck 26: Welding Metallurgy

Question 1

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

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

Answer 1

B

Question 2

One BTU is defined as the amount of ____.

A) heat required to raise 1 pound of water 1 ° Fahrenheit
B) energy required to raise 1 gram of water 1 ° Celsius
C) heat required to raise 1 gallon of water from freezing to boiling point
D) energy required to melt 1 gallon of water

Answer 2

A

Question 3

A cold-worked structure can be annealed by heating the metal above the ____ temperature.

A) M.
B) critical
C) melting
D) recrystallization

Answer 3

D

Question 4

____ is a compound of iron and carbon, Fe₂C.

A) Ferrite
B) Cementite
C) Pearlite
D) Austenite

Question 5

____ is magnetic and has very slight solid solubility, less than 0.02%, of carbon.

A) Ferrite
B) Cementite
C) Pearlite
D) Austenite

Question 6

When the surface of an object is a little above ____ Fahrenheit, the vibrating frequency of the atoms gives off visible light which we see as a dull red glow.

A) 200 °
B) 600 °
C) 1,000 °
D) 1,600 °

Question 7

____ may be defined as resistance to penetration.

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

Question 8

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

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

Question 9

____ is defined as the maximum load, per unit of area, to which a material will respond with a deformation directly proportional to the load.

A) Elastic limit
B) Elasticity
C) Tensile strength
D) Yield limit

Question 10

The phases and temperatures at which an alloy exists is summarized in a(n) ____.

A) crystal diagram
B) WPS
C) phase diagram
D) phase graph

Question 11

The M. temperature for carbon steels is about ____.

A) 200 ° F to 400 ° F
B) 400 ° F to 600 ° F
C) 600 ° F to 800 ° F
D) 800 ° F to 1000 ° F

Question 12

While a metal is in the liquid-solid phase, it is ____.

A) very weak
B) very strong
C) very tough
D) very elastic

Question 13

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

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

Question 14

Which of the following is a way of forming raw metal into a usable material?

A) Forging
B) Casting
C) Rolling
D) All of the above

Question 15

Pure iron forms the body-centered cubic (BCC) crystal below a temperature of ____ Fahrenheit.

A) 1000 °
B) 1200 °
C) 1527 °
D) 1675 °

Question 16

Which of the following is true of martensite?

A) It is the weakest of the transformation products of austenite.
B) As formed, it is very hard and brittle.
C) As formed, it is extremely useful in most engineering applications.
D) Martensite cannot be tempered.

Question 17

____ is the nonmagnetic form of iron and has the power to dissolve carbon and alloying elements.

A) Ferrite
B) Cementite
C) Pearlite
D) Austenite

Question 18

How is steel making similar to welding processes?

A) Both use a flux to remove impurities.
B) Both processes use an inert shielding gas to protect the molten metal from oxidation.
C) Both have a way of controlling the carbon content to control the hardness of the metal.
D) They really are not similar in any way.

Question 19

What is the most efficient way of converting molten steel into a usable product?

A) Ingot casting
B) Rolling
C) Continuous casting
D) Forging

Question 20

Silly Putty^®is ____.

A) ductile but has high impact strength
B) ductile but has low impact strength
C) brittle but has high impact strength
D) tough but has low impact strength

Question 21

Define annealing.

Question 22

How is a metal's hardness reduced?

A) Annealing
B) Forging
C) Re-melting
D) Using a grinder to remove the hard surface

Question 23

____________________ is a measurement of the vibrating speed or frequency of the atoms in matter.

Question 24

Stainless steels rely on ____________________ for their resistance to corrosion.

Question 25

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

Question 26

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

Question 27

What effect does forging have on a rolled steel's grain structure?

A) It causes the vertical grain structure to deform into a horizontal layer of softer iron carbide.
B) It creates a magnetic field around the metal that adds strength.
C) It forms a strong hard layer of fine grain structure around the core.
D) It causes the core of the plate to create a smoother softer form of iron.

Question 28

____________________ is the amount of thermal energy in matter.

Question 29

Explain the process of precipitation hardening.

Question 30

How does an individual grain grow in a cast structure?

A) From the outside surface toward the center
B) Upward from the bottom
C) Outward from the center to the edge
D) Randomly in all directions

Question 31

What is the difference between sensible and latent heat?

Question 32

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

Question 33

____________________ is the hardest of the transformation products of austenite.

Question 34

The smallest identifiable group of atoms is the ____________________.

Question 35

Which quenching process results in the most rapid cooling of a part?

A) Molten salt
B) Oil
C) Water
D) Air

Question 36

Explained why tempered martensite is very strong and tough.

Question 37

What is the difference between crystalline and amorphic solids? Give examples of both.

Question 38

What is the term used to describe the process of replacing some of the atoms in a crystal lattice with other metal atoms?

A) Solid-solution hardening
B) Precipitation hardening
C) Recrystallization
D) Normalizing

Question 39

Iron is called an ____________________ metal, because it exists in two different crystal forms in the solid state.

Question 40

The fundamental building blocks of all metals are atoms arranged in very precise three-dimensional patterns called ____________________.