Red Seal Welding Practice Exam

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What is the most common shielding gas for FCAW?

Argon
C25
Helium
CO2

The correct answer is: C25

C25 is the most common shielding gas for FCAW because it is a mix of 75% Argon and 25% CO2, which provides better arc stability and penetration compared to pure CO2. Argon and CO2 can be used individually for FCAW, but they do not have the same effectiveness as C25. Helium is not commonly used for FCAW because it is more expensive and produces a hotter arc, which can lead to spatter and porosity in the weld.