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

The number of electrodes used per hour

Answer

The maximum amperage the machine can ever produce

Answer

The frequency of AC current output

Question 2

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

Accepted Answer

GTAW

Answer

SMAW

Answer

FCAW

Answer

SAW

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

It cools the weld pool rapidly

Answer

It provides the primary filler metal

Answer

It stabilizes the electrical current

Question 4

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

Accepted Answer

AC (Alternating Current)

Answer

DCEP (DC Electrode Positive)

Answer

DCEN (DC Electrode Negative)

Answer

High-frequency DC

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 shielding gas regulator

Answer

The contact tip

Answer

The power source transformer

Question 6

What is plasma arc cutting (PAC) most similar to in terms of operating principle?

Accepted Answer

GTAW with high amperage

Answer

Oxyfuel cutting

Answer

Carbon arc gouging

Answer

Laser cutting

Question 7

In FCAW, what distinguishes a self-shielded wire from a gas-shielded wire?

Accepted Answer

Self-shielded wire generates its own shielding from core compounds; gas-shielded requires external gas

Answer

Self-shielded wire is solid; gas-shielded wire is tubular

Answer

Self-shielded wire requires DCEN; gas-shielded requires DCEP

Answer

Self-shielded wire is used only indoors