MIG Welding Metal Prep

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Often overlooked, welding metal prep is key to achieving good looking and strong welds with proper penetration. Metal fabricator Gary Simpson, explains the importance of properly cleaning metal and demonstrates how to remove mill scale to create stronger welds.

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2 Responses to “MIG Welding Metal Prep”
  1. Tim Barrett

    In terms of surface preparation for welding, does sandblasting adequately prepare the metal to weld? I know that “metal in white”, freshly blasted metal, is usually ready for priming and painting, but should I grind the welding surfaces after pieces come out of my blast cabinet? Thanks, Tim

    • Customer Service

      Hi Tim,

      After blasting we prefer to condition metal before priming, painting or even welding.

      Typically we do this with a “surface conditioning disc” (there are several types available from 3M and others)

      Or one of my favorites is the paint and rust removal discs, they are available from 3M, Norton, and others and work well, and available at most home improvement and auto parts stores.

      We find conditioning the metal before welding gives us better weld control, as the arc can sometime wander a bit of a freshly blasted “Toothy” surface.

      For painting conditioning the surface eliminates any micro particles of blasting media in the toothy surface, and gives you a smooth surface to start from.

      The only time we apply finish directly to blasted material is when powder coating as the toothy surface does a better job of hanging onto the powder until it is baked.

      Wrench Safe,

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