Deck 26: Welding Processes

Question 1

The feature that distinguishes fusion welding from solid-state welding is that melting of the faying surfaces occurs during fusion welding but not in solid-state welding:

Answer 1

True

Question 2

Which of the following processes are classified as fusion welding (three correct answers):

A)electrogas welding
B)electron-beam welding
C)explosion welding
D)forge welding
E)laser-beam welding
F)ultrasonic welding

Answer 2

electrogas welding
electron-beam welding
laser-beam welding

Question 3

Which of the following processes are classified as solid-state welding (three correct answers):

A)cross-wire welding
B)diffusion welding
C)friction welding
D)pressure gas welding
E)resistance seam welding
F)roll welding
G)stud welding

Answer 3

diffusion welding
friction welding
roll welding

Question 4

Electrodes used in arc welding processes are classified as consumable or nonconsumable.Filler metal is always added when consumable electrodes are used and never added when nonconsumable electrodes are used:

Question 5

An electric arc is a discharge of current across a gap in an electrical circuit.The arc is sustained in arc welding processes by the transfer of molten metal across the gap between the electrode and the work:

Question 6

Which two of the following are common gases used for shielding in arc welding:

A)argon
B)carbon monoxide
C)fluorine
D)flux
E)helium
F)hydrogen
G)nitrogen

Question 7

Which one of the following arc welding processes has the lowest heat transfer factor:

A)FCAW
B)GMAW
C)GTAW
D)SMAW

Question 8

Which one of the following arc welding processes uses a nonconsumable electrode:

A)FCAW
B)GMAW
C)GTAW
D)SMAW

Question 9

MIG welding is a term sometimes applied when referring to which one of the following processes:

A)FCAW
B)GMAW
C)GTAW
D)SMAW

Question 10

"Stick"welding is a term sometimes applied when referring to which one of the following processes:

A)FCAW
B)GMAW
C)GTAW
D)SMAW

Question 11

Which one of the following arc welding processes uses an electrode consisting of continuous consumable tubing containing flux and other ingredients in its core:

A)FCAW
B)GMAW
C)GTAW
D)SMAW

Question 12

Which one of the following arc-welding processes produces the highest temperatures:

A)CAW
B)PAW
C)SAW
D)TIG welding

Question 13

Resistance-welding processes make use of the heat generated by electrical resistance to achieve fusion of the two parts to be joined; no pressure is used in these processes, and no filler metal is added:

Question 14

Metals that are easiest to weld in resistance welding are ones that have low resistivities since low resistivity assists in the flow of electrical current:

Question 15

The rate of heat energy supplied in a resistance spot welding operation is determined by which one of the following equations:

A)R_H = ERt
B)R_H = E²R
C)R_H = IR
D)R_H = I²R
E)R_H = I²Rt where R_H =rate of heat energy E = voltage I = current R = resistance and t = time

Question 16

The fused zone between the two parts in a resistance spot welding operation is called which one of the following:

A)weld contact
B)weld fillet
C)weld nugget
D)weld seam
E)weld spot

Question 17

Oxyacetylene welding is the most widely used oxyfuel welding process because acetylene mixed with an equal volume of oxygen burns hotter than any other commercially available fuel:

Question 18

The term "laser"stands for "light actuated system for effective reflection":

Question 19

Thermite used in thermit welding is a mixture of which two of the following powder ingredients:

A)aluminum
B)aluminum oxide
C)iron oxide
D)magnesium
E)nitroglycerine
F)potassium nitrate

Question 20

Friction stir welding is a fusion welding process in which a rotating tool is fed along the joint line between two workpieces, generating friction heat and mechanically stirring the metal to form the weld seam:

Question 21

Which of the following solid-state welding processes applies heat from an external source (two best answers):

A)diffusion welding
B)forge welding
C)friction welding
D)ultrasonic welding

Question 22

The term weldability takes into account not only the ease with which a welding operation can be performed, but also the quality of the resulting weld:

Question 23

Copper is a relatively easy metal to weld because its thermal conductivity is high: