What is the purpose of slag removal between passes in FCAW?

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Multiple Choice

What is the purpose of slag removal between passes in FCAW?

Slag appears as a protective layer on the weld as it cools in FCAW, and it must be removed before adding the next pass. Cleaning that slag exposes a clean metal surface so the next bead can fuse properly with the previous weld and underlying base metal. If slag is left in place, the next pass can trap slag, create lack of fusion or porosity, and produce defects that weaken the weld. By removing slag between passes, you ensure a continuous, sound weld with good fusion and proper bead profile, which supports the overall strength and integrity of the joint.

Slag appears as a protective layer on the weld as it cools in FCAW, and it must be removed before adding the next pass. Cleaning that slag exposes a clean metal surface so the next bead can fuse properly with the previous weld and underlying base metal. If slag is left in place, the next pass can trap slag, create lack of fusion or porosity, and produce defects that weaken the weld. By removing slag between passes, you ensure a continuous, sound weld with good fusion and proper bead profile, which supports the overall strength and integrity of the joint.

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