List three post‑weld cleaning steps for FCAW/MCAW and explain why.

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Multiple Choice

List three post‑weld cleaning steps for FCAW/MCAW and explain why.

After FCAW/MCAW welding, cleaning the weld area is essential to remove residual flux slag, oxides, and other contaminants so the joint remains corrosion-resistant and is ready for coating or inspection. Slag removal is the key first step because the flux-derived slag blankets the weld bead and surrounding metal during solidification. If this slag isn’t chipped away, it can trap moisture and form corrosion points, and it can hide surface flaws that need to be checked during inspection. Wire brushing follows to physically clear away any remaining slag and oxide scale from the weld and adjacent base metal. This not only cleans the surface but also creates a slightly roughened texture that can help coatings adhere more reliably. Surface cleaning completes the prep by removing oils, grease, and other residues that can interfere with coating adhesion or promote corrosion. A clean surface ensures good coating bonding and accurate inspection results. Other options include steps that aren’t cleaning actions (like electroplating) or finishing steps (like painting) or are unnecessarily aggressive (like sandblasting) as standard post-weld cleaning, so they don’t fit the typical cleaning sequence.

After FCAW/MCAW welding, cleaning the weld area is essential to remove residual flux slag, oxides, and other contaminants so the joint remains corrosion-resistant and is ready for coating or inspection.

Slag removal is the key first step because the flux-derived slag blankets the weld bead and surrounding metal during solidification. If this slag isn’t chipped away, it can trap moisture and form corrosion points, and it can hide surface flaws that need to be checked during inspection.

Wire brushing follows to physically clear away any remaining slag and oxide scale from the weld and adjacent base metal. This not only cleans the surface but also creates a slightly roughened texture that can help coatings adhere more reliably.

Surface cleaning completes the prep by removing oils, grease, and other residues that can interfere with coating adhesion or promote corrosion. A clean surface ensures good coating bonding and accurate inspection results.

Other options include steps that aren’t cleaning actions (like electroplating) or finishing steps (like painting) or are unnecessarily aggressive (like sandblasting) as standard post-weld cleaning, so they don’t fit the typical cleaning sequence.

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