When multiple beads are used, it is NOT always necessary to remove slag between beads.

When multiple beads are used, it is NOT always necessary to remove slag between beads.

• A. True
• B. False
• C. Sometimes
• D. Never

Answer: (B)

Slag must be removed between passes in most multi-pass welds. Slag is a protective, non-metallic layer formed by flux, and it sits on top of the weld bead. If you leave it in place, the next bead cannot fuse properly to the underlying metal, which can trap slag, cause lack of fusion, porosity, and weak welds. Therefore, the idea that you don’t always have to remove slag between beads is not correct; you typically chip away and brush off the slag before continuing with the next bead.

Slag must be removed between passes in most multi-pass welds. Slag is a protective, non-metallic layer formed by flux, and it sits on top of the weld bead. If you leave it in place, the next bead cannot fuse properly to the underlying metal, which can trap slag, cause lack of fusion, porosity, and weak welds. Therefore, the idea that you don’t always have to remove slag between beads is not correct; you typically chip away and brush off the slag before continuing with the next bead.