What tool is used for cleaning aluminum before TIG welding?

• A. Nylon brush
• B. Brass wire brush
• C. Copper brush
• D. Stainless steel wire brush

Answer: (D)

Aluminum quickly forms a hard oxide layer that must be removed so the TIG weld can fuse properly. A stainless steel wire brush is the best choice because it can scrub away that oxide effectively without introducing contaminants that would weaken the weld or cause corrosion. It provides the right balance of stiffness to break up the oxide while staying relatively inert to the aluminum surface.

Nylon won’t remove the oxide well, and brass or copper brushes can leave residues that contaminate the weld area. A carbon steel brush can deposit iron onto the surface, which is undesirable for aluminum and can lead to corrosion or defects in the weld. After brushing, it’s common to wipe the surface with a solvent to remove oils and ensure a clean start.