Deck 25: Fundamentals of Welding

Question 1

Welding can only be performed on metals that have the same melting point; otherwise, the metal with the lower melting temperature always melts while the other metal remains solid:

Answer 1

False

Question 2

An autogenous weld is best described as which one of the following:

A)a fusion-welding operation in which filler metal is added
B)a fusion-welding operation in which no filler metal is added
C)a fusion-welding operation in which no heat is applied
D)a solid-state welding operation in which no heat or pressure are applied

Answer 2

a fusion-welding operation in which no filler metal is added

Question 3

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

A)arc welding
B)electron beam welding
C)friction welding
D)resistance welding
E)ultrasonic welding

Answer 3

friction welding
ultrasonic welding

Question 4

A fillet weld can be used to join which of the following joint types (three correct answers):

A)butt
B)corner
C)edge
D)lap
E)tee

Question 5

A fillet weld has a cross-sectional shape that is approximately which one of the following:

A)rectangular
B)round
C)square
D)triangular

Question 6

Groove welds are most closely associated with which one of the following joint types:

A)butt
B)corner
C)edge
D)lap
E)tee

Question 7

A flange weld is most closely associated with which one of the following joint types:

A)butt
B)corner
C)edge
D)lap
E)tee

Question 8

A surfacing weld is a weld in which one or more parts are joined to the surface of flat plate stock:

Question 9

Power density can be defined as the rate of heat energy transferred to the work per unit surface area:

Question 10

For metallurgical reasons, it is desirable to melt the weld metal with minimum energy input.Which one of the following heat sources is most consistent with this objective:

A)high power
B)high power density
C)low power
D)low power density

Question 11

Which one of the following welding operations generates the highest power density:

A)arc welding
B)electron beam welding
C)oxyfuel welding
D)resistance welding

Question 12

Which one of the following welding operations generates the lowest power density:

A)arc welding
B)electron beam welding
C)oxyfuel welding
D)resistance welding

Question 13

The amount of heat required to melt a given volume of metal depends strongly on which of the following properties (three best answers):

A)coefficient of thermal expansion
B)heat of fusion
C)melting temperature
D)modulus of elasticity
E)specific heat
F)thermal conductivity
G)thermal diffusivity

Question 14

The heat transfer factor in welding is correctly defined by which one of the following descriptions:

A)the proportion of the heat received at the work surface that is used for melting
B)the proportion of the total heat generated at the source that is received at the work surface
C)the proportion of the total heat generated at the source that is used for melting
D)the proportion of the total heat generated at the source that is used for welding

Question 15

The melting factor in welding is correctly defined by which one of the following descriptions:

A)the proportion of the heat received at the work surface that is used for melting
B)the proportion of the total heat generated at the source that is received at the work surface
C)the proportion of the total heat generated at the source that is used for melting
D)the proportion of the total heat generated at the source that is used for welding

Question 16

Weld failures always occur in the fusion zone of the weld joint, because this is the part of the joint that has been melted: