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  1. #1
    Join Date
    Jun 2006
    Posts
    5

    Default Tri Mix of any use for Tig?

    I have a 20 cf bottle of Tri-Mix (91% Helium 8% Argon 1% CO2) that I got for using with MIG welding stainless. Is this usable for TIG, any benefits of this over 100% Argon?

    I think I can get full credit on the bottle if I trade it in, would any other mixes (helium/argon) or gasses (helium) be good to have on hand? Or maybe I can get a transfill pigtail and keep it as a backup/portable unit for Argon.

    FWIW, I'm just getting familiar with TIG on (stainless) steel now, I'd like to do aluminum projects, and maybe even some copper.

    Rob

  2. #2
    Join Date
    Sep 2002
    Location
    Clark County, NV
    Posts
    2,696

    Default

    ANY CO2 is detrimental to a hot tungsten, but that is the lowest CO2 content of any Tri-mix I've seen before, most are 2.5%. I would say that it MIGHT be worth experimenting with, but it's not something you'd want to do on purpose if you had a choice. You really need an inert gas for most TIG welding, so argon does most things, and a 75/25 He/Ar is good for upper capabilites.

  3. #3
    Join Date
    Oct 2006
    Location
    British Columbia
    Posts
    500

    Cool Gases

    Argon is the best for ms,ss,alu,
    Helium is okay but thats about it i have never used a tri mix gas
    i should have used a tri mix in school to see what happens

  4. #4

    Default

    Helium mixes generally are used for aluminum, on straight polarity, and no thinner than 3/8"...it creates a hotter arc and will punch through thicker aluminum. I would think that your mix is used for automatic welding aliminum.
    Arcin' and Sparkin', Rocky D

    "Experience is the name we give our mistakes"

  5. #5
    Join Date
    Oct 2006
    Posts
    694

    Default

    ANY amount of CO2 is not good for tig welding. You will have trash all over your weld, and the tungsten will not stay sharp for even a few seconds.

    Heil trailers used to use Argon/CO2 mix, and I went through **** getting them to change... buncha idiots!!!

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