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Thread: Tig Welding Stainless

  1. #1
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    Tig Welding Stainless

    Question on Tig welding stainless about the back purge gas, what I have seen states using Argon. The purpose is to shield the welds back side from oxygen so the weld is clean. Can Mig gas (C25) be used for this purpose.
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  2. #2
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    Re: Tig Welding Stainless

    No. The CO2 present in C25 is not inert at welding temperatures. Oxygen will interact.

    The Noble gases, on the other hand, are perfectly content and they don't like to share their valence (outer) electron within anyone.
    Last edited by ManoKai; 10-27-2016 at 10:07 AM.
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  3. #3
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    Re: Tig Welding Stainless

    Thanks for the reply, I don't do much stainless and had a cylinder for Mig.
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  4. #4
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    Re: Tig Welding Stainless

    Perfect, I was looking for an answer for this exact question. A title like "C25 purge on stainless" or "CO2 Purge on stainless" might help others. I just stumbled on it.

    Thanks
    bo
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  5. #5
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    Re: Tig Welding Stainless

    DIY CNC Plasma table USB BOB Price THC
    Hypertherm 65
    Everlast PowerTig 255 EXT
    Miler 180 Mig
    13" metal lathe
    Mill/ Drill
    ECT, ECT,

  6. #6
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    Re: Tig Welding Stainless

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    We use a Victor dual regulator.

  7. #7
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    Re: Tig Welding Stainless

    Quote Originally Posted by acourtjester View Post
    This is a good deal.

  8. #8
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    Re: Tig Welding Stainless

    You can use nitrogen, we have had some stainless jobs in the fab shop that allowed it. It's cheaper than argon, I guess. The gas doesn't lay in there as nice and heavy as argon does, but you make a nice shiny bead with it. I was on a chrome moly job in an Exxon refinery once and we purged all that with plant nitrogen.
    Last edited by TimmyTIG; 02-19-2017 at 09:08 PM.

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