AWS Flux-Cored Arc Welding (FCAW) 5

Question 1

What is the main advantage of using 75% Ar / 25% CO2 shielding gas instead of 100% CO2 for FCAW-G?

Accepted Answer

Reduced spatter and smoother arc characteristics

Answer

Adding argon to CO2 shielding gas reduces spatter and produces a smoother, more stable arc, improving weld appearance and reducing cleanup time.

Question 2

Which AWS specification governs the classification of carbon steel flux-cored electrodes for FCAW?

Accepted Answer

AWS A5.20

Answer

AWS A5.20 is the specification that classifies carbon steel electrodes specifically for flux-cored arc welding.

Question 3

What defect is most likely to occur if the FCAW gun angle is too steep (pushing angle greater than 25°)?

Accepted Answer

Excessive slag inclusions due to flux being pushed ahead of the arc

Answer

An excessively steep push angle drives molten flux ahead of the weld pool, where it can become entrapped in the solidifying weld metal as slag inclusions.

Question 4

When pre-qualifying a FCAW procedure under AWS D1.1, increasing the base metal thickness beyond the tested range typically requires:

Accepted Answer

A new WPS supported by a new PQR at the increased thickness

Answer

AWS D1.1 requires a new Procedure Qualification Record (PQR) with testing at the new thickness to support a revised WPS when essential variables change.

Question 5

Which condition distinguishes FCAW-S from FCAW-G regarding suitability for field welding?

Accepted Answer

FCAW-S needs no external gas cylinder, making it more portable for field use

Answer

FCAW-S generates its own shielding from the flux core, eliminating the need to transport gas cylinders, which makes it highly practical for outdoor and field welding applications.

AWS Practice Test

AWS Practice Test

AWS Flux-Cored Arc Welding (FCAW) 5