How to Remove Metal Discoloration from Welding


Welding is the process of merging two pieces of metal into one by melting them into a softened state and then blending them together so they'll harden into a single piece of iron or steel. Welding forms very strong bonds that are difficult to break but the result can frequently leave discoloration over the welded area from the heat application. Cleaning the burns or discoloration off of welded metal requires the proper cleaning tools.

Things You'll Need

  • 2 stainless steel brushes
  • Protective gloves
  • Pickling gel
  • Water
  • Apply a clean stainless steel brush to the discoloration. If the staining is only on the surface of the weld, it may scrub off. Rinse the stain with warm water and several drops of mild dish detergent to give the brush added cleaning effects.

  • Apply a pickling gel to the stains. The gel normally has a concentration of acid and other abrasive chemicals so always wear protective gloves and follow all instructions on the packaging. Ensure the gel is designed for the specific metal you are applying it to.

  • Scrub the gel away with a separate steel brush that will only be used with the gel. Once the gel comes into contact with the brush, it can't be used for any other purpose since it will spread the acidity of the gel to other surfaces. Many pickling gels will come with brushes for this purpose.

  • Rinse the weld with tap water once the stains are removed to eliminate any remaining acidity.

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