Aluminum Turning Black When Welding: Causes, Solutions, and Weld Quality Tips
When aluminum turns black during welding, it is usually caused by black soot, or smut. This blackening happens when magnesium oxide vaporizes from the filler metal, often 5356. Ensuring proper gas flow and maintaining the electrode can reduce soot. Contamination from tungsten or air also leads to weld discoloration. Inadequate shielding gas can also contribute … Read more