Which operation should not reduce the thickness of surrounding material when finishing welds?

• A. Polishing
• B. Dressing
• C. Cutting
• D. Grinding

Answer: (B)

The main idea here is finishing welds without thinning the surrounding base metal. Dressing is the appropriate operation because it trims and shapes the weld bead to a smooth profile while leaving the surrounding material thickness essentially unchanged. It focuses on removing excess weld metal rather than removing base metal, so the integrity and thickness of the surrounding workpiece are preserved.

Polishing, while often used to create a smooth surface and shine, can involve removing a small amount of material if done aggressively, though its main goal is surface finish rather than material removal. Cutting explicitly removes material, which reduces thickness. Grinding uses an abrasive to shape and smooth the surface and can remove base material if not controlled, potentially thinning the part.