AWS AWS Welding Processes & Equipment

Question 1

In GMAW (MIG welding), what is the primary function of the shielding gas?

Accepted Answer

To protect the molten weld pool from atmospheric contamination (oxygen and nitrogen)

Answer

To preheat the base metal

Answer

To increase the arc voltage

Answer

To serve as a flux carrier

Question 2

Which SMAW electrode coating type produces a low-hydrogen deposit and requires storage in a rod oven?

Accepted Answer

E7018 (low-hydrogen iron powder)

Answer

E6010 (cellulosic)

Answer

E6013 (rutile)

Answer

E6011 (cellulosic AC/DC)

Question 3

In GTAW (TIG welding), what does 'AC' current provide when welding aluminum?

Accepted Answer

Cleaning action that breaks up the aluminum oxide layer on the DCEP half-cycle

Answer

Deep penetration into the base metal

Answer

Higher deposition rate than DCEN

Answer

Reduced arc instability

Question 4

What is the primary advantage of FCAW (Flux-Cored Arc Welding) over solid wire GMAW?

Accepted Answer

Higher deposition rates and improved performance on rusty or dirty steel

Answer

No shielding gas is ever required

Answer

Lower heat input than GMAW

Answer

Produces no spatter

Question 5

In SAW (Submerged Arc Welding), the arc is submerged beneath:

Accepted Answer

A layer of granular flux

Answer

Water

Answer

A dense shielding gas mixture

Answer

Molten slag from the previous pass

Question 6

Which welding process uses a non-consumable tungsten electrode and is best suited for precision welding of thin materials?

Accepted Answer

GTAW

Answer

SMAW

Answer

GMAW

Answer

FCAW