CWI Welding Process Fundamentals 2

Question 1

In GMAW, what is the primary function of the shielding gas?

Accepted Answer

To protect the weld pool from atmospheric contamination

Answer

To preheat the base metal

Answer

To increase wire feed speed

Answer

To reduce spatter by cooling the arc

Question 2

Which GMAW transfer mode is best suited for welding thin sheet metal in all positions?

Accepted Answer

Short-circuit transfer

Answer

Globular transfer

Answer

Spray transfer

Answer

Pulsed spray transfer

Question 3

What does the term 'duty cycle' mean for a welding power source?

Accepted Answer

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

Answer

The number of welds completed per hour

Answer

The ratio of arc-on time to electrode feed rate

Answer

The maximum open-circuit voltage the machine can produce

Question 4

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

Accepted Answer

It shields the arc, refines the weld metal, and can add alloying elements

Answer

It serves as the primary filler metal

Answer

It acts only as a preheating medium

Answer

It replaces the need for a base metal

Question 5

What is the primary advantage of using a constant voltage (CV) power source for GMAW?

Accepted Answer

It self-corrects arc length by automatically adjusting current as wire feed rate varies

Answer

It maintains a constant current regardless of arc length

Answer

It eliminates the need for shielding gas

Answer

It allows welding at higher travel speeds than SMAW

Question 6

Which of the following best describes the FCAW-S (self-shielded) process?

Accepted Answer

Uses a flux-cored wire that generates its own shielding gases from core ingredients

Answer

Uses a solid wire electrode with external CO2 shielding

Answer

Requires both flux and external shielding gas for all positions

Answer

Uses a granular flux fed separately from the wire

Question 7

In GTAW, what is the purpose of high-frequency (HF) start?

Accepted Answer

To initiate the arc without the tungsten touching the base metal

Answer

To increase travel speed

Answer

To preheat the filler rod before welding

Answer

To clean the oxide layer by reversing polarity