Flux-Cored Arc Welding (FCAW) Flashcards
7 cards from real AWS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Flux-Cored Arc Welding (FCAW) flashcards as text
In FCAW-G, what is the primary purpose of the external shielding gas?
Answer: To protect the molten weld pool from atmospheric contamination
External shielding gas in FCAW-G shields the molten weld pool from oxygen, nitrogen, and moisture in the surrounding atmosphere.
Which condition is most likely to cause porosity when using FCAW-S (self-shielded) outdoors?
Answer: Wind speed exceeding 5 mph disrupting flux shielding
High wind disperses the gaseous shield produced by the flux core, allowing atmospheric gases to contaminate the weld pool and cause porosity.
What does a 'T-1' designation indicate in an AWS FCAW electrode classification such as E71T-1C?
Answer: Rutile-type flux designed for flat and horizontal positions with CO2 shielding
The T-1 usability designator indicates a rutile (titania) slag system suitable for all-position welding with CO2 or mixed-gas shielding.
When welding with FCAW in the vertical-up position, which parameter adjustment best prevents the weld pool from sagging?
Answer: Reduce heat input by lowering amperage and travel speed slightly
Lowering heat input reduces the fluidity of the weld pool, making it easier to control and preventing sagging in the vertical-up position.
What is the typical electrode extension (stickout) range for FCAW?
Answer: 3/4 to 1-1/2 inches
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.
Which type of current polarity is most commonly used for FCAW-G electrodes?
Answer: DCEP (direct current electrode positive)
Most FCAW-G electrodes operate on DCEP, which provides stable arc characteristics and good penetration.
A welder notices the slag from an FCAW weld is difficult to remove and tightly adhered. What is the most likely cause?
Answer: Voltage set too low causing a short, convex bead
Low voltage produces a convex bead profile that traps slag beneath the weld edges, making removal extremely difficult.