AWS Flux-Cored Arc Welding (FCAW) 4

Question 1

In FCAW-G, what is the primary purpose of the external shielding gas?

Accepted Answer

To protect the molten weld pool from atmospheric contamination

Answer

External shielding gas in FCAW-G shields the molten weld pool from oxygen, nitrogen, and moisture in the surrounding atmosphere.

Question 2

Which condition is most likely to cause porosity when using FCAW-S (self-shielded) outdoors?

Accepted Answer

Wind speed exceeding 5 mph disrupting flux shielding

Answer

High wind disperses the gaseous shield produced by the flux core, allowing atmospheric gases to contaminate the weld pool and cause porosity.

Question 3

What does a 'T-1' designation indicate in an AWS FCAW electrode classification such as E71T-1C?

Accepted Answer

Rutile-type flux designed for flat and horizontal positions with CO2 shielding

Answer

The T-1 usability designator indicates a rutile (titania) slag system suitable for all-position welding with CO2 or mixed-gas shielding.

Question 4

When welding with FCAW in the vertical-up position, which parameter adjustment best prevents the weld pool from sagging?

Accepted Answer

Reduce heat input by lowering amperage and travel speed slightly

Answer

Lowering heat input reduces the fluidity of the weld pool, making it easier to control and preventing sagging in the vertical-up position.

Question 5

What is the typical electrode extension (stickout) range for FCAW?

Accepted Answer

3/4 to 1-1/2 inches

Answer

FCAW typically uses 3/4 to 1-1/2 inch electrode extension, which is longer than GMAW to allow for resistance heating that improves deposition rate.

AWS Practice Test