Certified Welder Welding Processes and Equipment 2

Question 1

What does the term 'duty cycle' mean when applied to a welding power source?

Accepted Answer

The percentage of a 10-minute period the machine can weld at a rated output

Answer

Duty cycle is the percentage of a 10-minute period that a machine can operate at its rated amperage without overheating.

Question 2

Which welding process uses a non-consumable tungsten electrode and a separate filler rod?

Accepted Answer

GTAW

Answer

Gas Tungsten Arc Welding (GTAW/TIG) uses a non-consumable tungsten electrode with a separate filler metal added manually.

Question 3

In Submerged Arc Welding (SAW), what is the purpose of the granular flux?

Accepted Answer

It shields the arc and weld pool from atmospheric contamination

Answer

In SAW, the granular flux covers the arc and molten weld pool, shielding it from atmospheric gases and stabilizing the arc.

Question 4

What type of current is most commonly used for GTAW when welding aluminum?

Accepted Answer

AC (Alternating Current)

Answer

AC current is used for GTAW on aluminum because the electrode-positive half-cycle provides oxide cleaning action on the aluminum surface.

Question 5

Which component in a GMAW setup controls the rate at which wire is fed to the welding gun?

Accepted Answer

The wire feed unit (wire feeder)

Answer

The wire feed unit drives the electrode wire from the spool to the welding gun at a speed set by the operator.

Certified Welder Practice Test