Chapter 15 - GMAW and FCAW

Question 1

What is another name for direct current reverse polarity?

Answer 1

electrode positive

Question 2

What type of shielding gas is usually used for globular transfer?

Answer 2

carbon dioxide

Question 3

A number ___ shade lens is recommended for GMAW

Answer 3

11

Question 4

What happens when the hole in the contact tube becomes enlarged due to wear? What is done to correct the problem?

Answer 4

When the contact tube becomes enlarged good electrical contact cannot be made. The contact tube must be replaced when this happens.

Question 5

What term is used to describe the process with a continually fed electrode that uses a shielding gas and no flux?

Answer 5

GMAW

Question 6

Pulsed spray transfer has two different currents, name them

Answer 6

Peak and background

Question 7

At what point on the ball is the flowmeter read?

Answer 7

The top of the ball

Question 8

What types of metal transfer do not put much heat into the work and can be used in all positions?

Answer 8

Pulsed spray transfer and short circuit transfer

Question 9

List 4 advantages of GMAW as compared to shielded metal arc welding

Answer 9

1. Don’t have to stop and change electrodes
2. Welding speeds are faster
3. No slag
4. Easier to operate

Question 10

What type of shielding gas will give deep penetration and undercut when welding on steel?

Answer 10

Argon

Question 11

List a gas that’s not a shielding gas

Answer 11

Hydrogen

Question 12

An alternate term for constant voltage

Answer 12

Constant potential

Question 13

A switch on a welding machine that manually controls the flow of shielding gas

Answer 13

Purge switch

Question 14

One type of constant voltage power supply

Answer 14

Transformer-rectifier

Question 15

Shielding gases that do not react with the weld, such as argon and helium

Answer 15

Inert gases

Question 16

When welding with aluminum wire, what type of liner is used?

Answer 16

Teflon