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Brown soot on welds?

Discussion in 'Shop - Fabrication' started by norskpride08, Aug 15, 2010.

  1. norskpride08

    norskpride08 Well-Known Member

    Mar 12, 2010
    Whittier, CA
    Hey I'm just curious what causes this brown smoke like layer on my weld is and what causes is it! Is it just from me not cleaning the material before hand, or is it my Gas coverage, or volts and wire speed? It is way worse on 3/16 plate when I run vertical down! It completely covers the weld sometimes to where I can't see the finished piece that well! Anyway some thoughts or ways to prevent it or atleast clean it off would be
    greatly appretiated, THANKS

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  2. atomicjoe23

    atomicjoe23 Well-Known Member

    Feb 2, 2008
    Silverdale, WA
    A wire brush will remove it right off the bat. . .if I remember correctly from welding class (it's been a while) that's just from not having absolutely clean metal. I get that myself occasionally. . .usually only if I haven't removed the mill scale from my workpieces though.

    The brownish stuff that forms at the overlap points of the weld puddles themselves is silicon though and is a normal by-product of welding.
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