In FCAW, the flux-cored wire provides shielding through a slag and a gaseous shield.

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Multiple Choice

In FCAW, the flux-cored wire provides shielding through a slag and a gaseous shield.

Explanation:
In FCAW, shielding the weld pool comes from two sources produced by the flux in the wire. The flux melts and forms a protective slag layer that blankets the molten weld and stays on the surface as it cools, keeping air and oxygen away from the weld. At the same time, the flux chemistry releases gases when heated, creating a local gaseous shield around the arc and weld pool. In some FCAW variants, shielding gas from a cylinder adds to this protection, but even without external gas, the flux itself contributes a gaseous shield. So the wire provides shielding both through slag coverage and a gaseous shield.

In FCAW, shielding the weld pool comes from two sources produced by the flux in the wire. The flux melts and forms a protective slag layer that blankets the molten weld and stays on the surface as it cools, keeping air and oxygen away from the weld. At the same time, the flux chemistry releases gases when heated, creating a local gaseous shield around the arc and weld pool. In some FCAW variants, shielding gas from a cylinder adds to this protection, but even without external gas, the flux itself contributes a gaseous shield. So the wire provides shielding both through slag coverage and a gaseous shield.

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