Chapter 16 - GMAW and FCAW

Question 1

A ball-float flowmeter must be installed in a ______ position?

Answer 1

Vertical

Question 2

If the drive rolls in the wire feeder put too much pressure on a flux core wire, what happens?

Answer 2

The drive roll will slip over the wire

Question 3

What is the name of the pliers used to cut electrode wire?

Answer 3

welpers

Question 4

What happens when the purge switch is pressed?

Answer 4

Shielding gas starts to flow. The switch is used to set the flow rate and to purge any air in the hose.

Question 5

List a cause of birds nest

Answer 5

Wire feed speed is too fast
Welding gun is held too close to the work
Voltage is set too low

Question 6

A type of wire feeder roll with ridges in the groove to grip and push the electrode wire

Answer 6

Knurled roll

Question 7

A control on a welding machine that allows variation in the length of time that post flow continues

Answer 7

Post flow adjustment

Question 8

A receptacle on the welding machine where the wire feed control mechanism is plugged in.

Answer 8

Remote contractor control

Question 9

Constant Voltage or Constant Current

Answer 9

Constant Voltage

Question 10

In MIG do we push or pull the puddle?

Answer 10

Push

Question 11

List the 3 types of metal transfer

Answer 11

1. Short Circuit
2. Globular
3. Spray Transfer

Question 12

List a disadvantage of MIG

Answer 12

Doesn't work well in wind
Expensive equipment
Joints can be tricky
Not as mobile
Requires additional shielding gas

Question 13

Flux core uses what type of drive roll?

Answer 13

Knurled drive roll

Question 14

MIG uses what type of drive roll?

Answer 14

V groove

Question 15

Metal Core uses what type of drive roll?

Answer 15

Knurled drive roll

Question 16

Aluminum uses what kind of drive roll?

Answer 16

U shaped

Question 17

What is the purpose of using carbon dioxide as a shielding gas?

Answer 17

Gives it the penetration

Question 18

Because the contact tube is not visible, which distance do you control while welding?

Answer 18

Nozzle to work distance

Question 19

When making a fillet weld, what is the proper work angle?

Answer 19

0 degrees

Question 20

Which method produces the best penetration?

Answer 20

Backhand

Question 21

Which method produces less spatter?

Answer 21

Backhand

Question 22

How long should the electrode extension be when using GMAW in short circuit?

Answer 22

1/4” to 1/2”

Question 23

What determines the welding arc length in GMAW?

Answer 23

The voltage set on the welding machine

Question 24

What do you do if your weld pool gets too large?

Answer 24

Increase travel speed

Question 25

What type of metal transfer can be used out of position?

Answer 25

Short circuit and pulse spray transfer

Question 26

When welding overhead, the shielding gas flow rate must be increased

Answer 26

True

Question 27

The welding gun is usually pointed up when welding vertically up?

Answer 27

True

Question 28

Which position is considered the most difficult?

Answer 28

Overhead

Question 29

A lap joint often requires that the electrode is pointed more toward the ____________ than the edge.

Answer 29

surface