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TIG welding cold rolled steel problem

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  • TIG welding cold rolled steel problem

    I am TIG welding cold roll 1/8" plate in a T joint configuration. For some reason when i weld cold rolled i can only get a nice weld on one side. The other side of the plate gets little scales and its impossible to weld even after i steel brush it. how do i avoid this?

  • #2
    Back it up with another piece of metal to keep the air away as much as possible.
    Nothing welded, Nothing gained

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    • #3
      Wire brushing will not remove scale. All it does is polish it.

      For tig welding, you need to "grind" the scale off with a grinding wheel or flap disk.
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      • #4
        it is cold rolled steel so there is no scale until AFTER i weld one side. what causes the scaling? does the heat just bring crap in the metal to the surface? i will try grinding or sand flap.

        how does placing a plate of steel behind the weld side prevent scaling?


        • #5
          You are creating the scale from the heat. This is why hot rolled steel has scale. It is the reaction from oxygen on hot steel. Adding a plate behind it will act as a heat sink to keep the steel cooler. Although, I think you are welding too hot and / or too slow to be creating scale on 1/8 tee joint.
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          • #6
            As the other members stated, a reaction with the O2 in air causes that scaling. It is called sugering on stainless, that is why they have to backgas/purge with inert gas on stainless,titanium,nickle alloys, ect.
            There is a product called Solarflux, been around since WWII, developed for welding stainless exhaust manifolds for the Navy, was a top secret during the war. That would solve your problem, comes as a powder, you mix with methanol as much as you need, and paint on, the stuff brushes off except where high heat is and that will turn to a glass slag, it can be knocked off easy with a wire brush or Scotchbrite pad on grinder. Pricey, but can solve major problems while welding on objects that are difficult to purge/backgas. It goes a long way and can be rejuvenated if you let the methanol evaporate.

            Hope this helps, Paul ,
            Last edited by paulrbrown; 11-09-2011, 08:44 AM.
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            • #7
              Not a professinal by any standards but i do believe your welding too hot or too slow as mentioned.


              • #8
                Thanks for everyones response. I understand the heat issue but i feel if i welded any cooler i wouldn't be getting good penetration. i will try to get a picture of the welds but they dont appear to be too hot. The welds are fairly shiny. Placing a heat sink on the other side is a good idea.


                • #9
                  another trick:aluminum is a even better heat sink than steel and copper is even better........use angle for putting under your corner seams and it will act as a stop shelf and will not stick to the piece being welded....hope this makes sense....Paul
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