Deck 9: Gas Metal ARC Welding of Pipe

Question 1

Which GMAW process is the newest? ​

Answer 1

Modulated current metal transfer is the newest GMAW process. ​

Question 2

_____ is the distance from the end of the contact tube to the arc measured along the welding electrode. ​

A)Stickout​
B)Electrode extension ​
C)Electrode positioning
D)Burnthrough​

Answer 2

B

Question 3

What results from the combination of electrical volts and amps? ​

Answer 3

The combination of volts and amps produces heat. ​

Question 4

The terms voltage , volts , potential , and electromotive force all relate to electrical _____. ​

A)pressure​
B)shock​
C)amperage​
D)current​

Question 5

The _____ process is identified by the pointing of the wire tip from which hundreds of very small drops are projected per second axially across the arc gap to the molten weld pool. ​

A)buried-arc transfer ​
B)axial spray transfer ​
C)modulated current transfer ​
D)globular metal transfer ​

Question 6

_____ occurs when the electrode comes into physical contact with the molten weld pool or solid base metal upon initiation of the weld. ​

Question 7

Where is the hot pass typically placed? ​

Question 8

Gas metal arc welding (GMAW)was originally developed as a process for welding _____. ​

A)steel​
B)aluminum​
C)pipes​
D)wire​

Question 9

What are fillet welds used for? ​

Question 10

In modulated current transfer, why is the explosive reestablishment of the arc softer, occurring over a very short period of time? ​

Question 11

_____ is the property in an electrical circuit that directly affects the rate of change in current flow. ​

A)Pinch effect ​
B)Transfer​
C)Power​
D)Inductance​

Question 12

The GMAW process is unique in that there are _____ modes of transferring the filler metal from the wire to the weld. ​

A)four​
B)five​
C)six​
D)seven​

Question 13

The terms amperage , amps , ampere , and current all refer to _____. ​

Question 14

The _____ of a pipe to be welded determines the number of tack welds that will be necessary to maintain joint alignment during welding. ​

A)length​
B)height​
C)radius​
D)diameter​

Question 15

The three major effects that modulated current provides are reduced spatter, lower heat input, and _____. ​

Question 16

The _____ is the angle between the center line of the gun and the weld as it relates to the direction of travel. ​

Question 17

If the welding leads of a CC machine were electrically shorted together, the amperage would _____. ​

A)increase​
B)decrease​
C)remain about the same ​
D)reach the machine's maximum output ​

Question 18

The _____ is the angle between the center line of the welding gun and the work. ​

A)machine angle​
B)groove angle​
C)work angle​
D)gun angle​

Question 19

The _____ method uses a specially designed welding machine that can provide a rapidly pulsing current. ​

Question 20

_____ are used to seal the end of a pipe when the pipe is being used for a handrail or other similar application, and where the pipe will not be carrying a fluid. ​

A)Fillet welds​
B)Base plates​
C)Fillet plates​
D)Blank-off plates​