GMAW (mig)

Question 1

Gas metal arc welding is also known as what?

Answer 1

Mig
(Gmaw)

Question 2

When doing semiautomatic welding what two things does the equipment control?

Answer 2

Feed and arc length

Question 3

What does GMAW-S stand for?

Answer 3

Gas metal arc welding short circuiting

Question 4

A buzzing or sharp crackling sound best describes what type of metal transfer?

Answer 4

GMAW-S
Gas Metal Arc Welding short circuiting

Question 5

What must eyes, face, and exposed skin be protected from when GMAW Welds cool down?

Answer 5

Isles of silicone

Question 6

What is the MAX thickness that is typically welded with GMAW-S

Answer 6

1/4-3/8 inch

Question 7

GMAW spray welding is generally NOT done on materials thinner than what?

Answer 7

3/8

Question 8

What is the abbreviation for pulse variation of gas welding?

Answer 8

GMAW-P

Question 9

What type of power source must be used for pulse welding?

Answer 9

Inverter

Question 10

A hissing or whispering sound best describes what type of metal transfer?

Answer 10

Spray

Question 11

List the two AWS abbreviations for the arc welding processes that melt a tubular electrode with alloys, deodorizers, and slag formers in their cores?

Answer 11

FCSW-G

FCAW-S

Question 12

How many types of feed rollers are there

Answer 12

3

Question 13

What are the 3 types of feed rollers?

Answer 13

Flat
Single groove
Double groove

Question 14

What are the 4 types of drive roll groove shapes?

Answer 14

V groove
U groove
Knurled V groove
Cogged U groove

Question 15

What is a V groove drive roller used for in terms of welding?

Answer 15

Hard wire
Ex steel

Question 16

What are U groove drive rollers used for in terms of welding?

Answer 16

Soft wire
Ex aluminum or soft shelled cores wires

Question 17

What are knurled V groove drive wheels used for in terms of welding?

Answer 17

Hard wheeled wires or on spool guns

Question 18

What are cogged U groove drive wheels used for in terms of welding?

Answer 18

Extremely soft wire or soft shelled cores wires

Ex hard facing wires

Question 19

What keeps adequate pressure against the feed rolls for gripping the weld wire?

Answer 19

Spring type pressure adjustment

Question 20

What are most guns rated under 400amps designed for use with?

Answer 20

CO2 gas and are air cooled

Question 21

What time frame SHOULD wire be used in (mig) ?

Answer 21

2-3 months

Question 22

What two things does the equipment control in GMAW?

Answer 22

Electrode feeding
Arc length

Question 23

What type of power source MUST be used for pulse welding?

Answer 23

Inverter

Question 24

What type of power source can be used for all GMAW processes?

Answer 24

Constant voltage

Question 25

Due to GMAW using a continuous wire the duty cycle for industrial power sources should be what?

Answer 25

100% duty cycle

Question 26

What are the two common types of wire feeders in GMAW?

Answer 26

Constant speed feeders
Voltage sensing feeders

Question 27

What type of drive roll would be used in GMAW for feeding aluminum wire?

Answer 27

“U”

Question 28

What is the cubic feet per hour for spray or pulse spray? (GMAW)

Answer 28

30-50 cubic feet per hour

Question 29

Which gas produces the deepest penetration in GMAW?

Answer 29

C02

Question 30

What is the strength of ER70S-6 wire?

Answer 30

70,000 lbs of tensile strength

Question 31

In GMAW and FCAW amperage is set by which control?

Answer 31

Wire feed speed

Question 32

In GMAW how does the length of the arc affect the voltage?

Answer 32

The higher the longer the arc the higher the voltage

Question 33

When troubleshooting GMAW what 3 areas should you break it down into?

Answer 33

Process variables
Consumables
Equipment