456A FCAW

Question 1

What are the two types of FCAW (Flux-Cored Arc Welding)?

Accepted Answer

Gas-shielded FCAW (FCAW-G) using external shielding gas and self-shielded FCAW (FCAW-S) where the flux core provides all shielding

Answer

Gas-shielded FCAW and manual FCAW

Answer

Single-pass FCAW and multi-pass FCAW

Answer

AC FCAW and DC FCAW

Question 2

What is the main advantage of self-shielded FCAW over GMAW for outdoor structural welding in Canada?

Accepted Answer

The self-generated shielding is not affected by wind, making it reliable for outdoor and field welding in Canadian weather conditions

Answer

It produces a more attractive weld bead

Answer

It requires less skill to operate

Answer

It uses less electricity

Question 3

What type of polarity is typically used for self-shielded FCAW?

Accepted Answer

DCEN (DC Electrode Negative / Straight Polarity) for most self-shielded wires

Answer

DCEP (Reverse Polarity)

Answer

AC only

Answer

No polarity preference

Question 4

What is the purpose of the flux core inside an FCAW wire?

Accepted Answer

To produce shielding gas, form protective slag, add deoxidizers and alloying elements, and stabilize the arc — similar functions to SMAW flux coating

Answer

To make the wire cheaper to manufacture

Answer

To increase the wire's electrical resistance

Answer

To make the wire more flexible

Question 5

What is the typical wire stick-out (contact-tip-to-work distance) for FCAW?

Accepted Answer

19 to 38 mm (3/4 to 1-1/2 in.) — longer than GMAW

Answer

6 to 10 mm (1/4 to 3/8 in.)

Answer

50 to 75 mm (2 to 3 in.)

Answer

The same as GMAW — 10 to 19 mm

Question 6

What is worm tracking (gas marks) on an FCAW weld surface?

Accepted Answer

Small surface marks or trails on the weld bead caused by gas escaping through the slag as it solidifies; usually cosmetic but can indicate improper technique or excessive voltage

Answer

A decorative weld pattern

Answer

A type of internal porosity visible only on X-ray

Answer

Marks left by the wire feed mechanism