How To Remove Welding Marks On Stainless Steel. Stainless steel pickling paste which is a nitric acid based compound I believe works very well for removing weld discoloration without altering the. After removal of the heat tint passivation should be performed with either nitric or citric acid gel passivation.
Stainless steel passivates - forms that thin chromium oxide film - just by exposure to air. The type of polishing abrasive you use will depend on the level of finish you require. This way you can remove the acid residue before it alters the appearance of your stainless steel component.
The product is called Scotchbrite and is sold in rectangular pads or wheels that attach to an electric drill.
An efficient back purge will minimise the formation of heat-tint. One way to prevent warping when welding stainless-steel is to clamp a piece of brass or copper behind the seam of the weld. The type of polishing abrasive you use will depend on the level of finish you require. An efficient back purge will minimise the formation of heat-tint.