WELD 101 C Practice Test

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What shielding gas is used when using self-shielded FCAW?

None is required

Self-shielded FCAW relies on the flux inside the wire to protect the weld. As the electrode burns, the flux releases shielding gases and forms slag that surround and shield the molten pool. Because the shielding comes from the flux itself, no external shielding gas is used. External gases like argon or CO2 are used with gas-shielded FCAW or GMAW, not with self-shielded FCAW. So none is required.

Argon

CO2

Helium

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