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  1. #1

    Default Can I mig weld stainless steel


    I am pretty new, and wanted to see if I can Mig Weld stainless steel. Are there any tricks and can anyone point me in the direction of some instructions on how to setup for it?


  2. #2
    Join Date
    Mar 2008
    Baltimore, Maryland


    What machine do you have? What type of stainless are you welding? You must use tri-mix and it does cost a lot more then 75-25 mix. Plate, pipe, thickness. It's easy to weld with the right set up. IMHO.

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  3. #3

    Default Over my head!

    I think I am over my head on the stainless idea. I am running a millermatic 172 setup for steel. I think it is a 75%/25% argon mixture.

    I was told to use a flux core wire to make my life easier, and was hoping I could do the same with Stainless.

    I am only looking to weld small decorative items, like a 2'x3' fountain with pretty thin metal. I also thought about using it for highlights on a gate I am building.

  4. #4
    Join Date
    Jun 2008
    davie, fl


    just switch your wire and weld if you dont have tri mix try welding with 25/75. stainless steel welds just like steel. if you arent sure just try it on a couple pieces of scrap. your machine is fine and has the same capacities for stainless steel as for steel.

  5. #5
    Join Date
    Aug 2006
    Browns Valley, California


    If you don't care about the welds rusting, just weld it with ER70S-6 and C-25. If you want to keep the rust away, I'd get a small roll of ER309L and still use C-25.

    I've welded SS with C-25, and it turns out OK for small stuff. If I were going to get into serious SS fabrication, I'd probably want the helium/argon/COČ tri-mix, but I'd sure run a coupon or two first before I bought another gas cylinder!

    ...from the Gadget Garage
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  6. #6
    Join Date
    Mar 2007

    Default gas mix

    has anyone tried argon/ 2% co2 ?
    as per Ed's suggestion:

    I'd be curious to see what the welds look like from a mig (like mine: 210 miller)



  7. #7
    Join Date
    Sep 2005
    Salem ,Ohio


    Quote Originally Posted by jackflash View Post
    has anyone tried argon/ 2% co2 ?
    as per Ed's suggestion:

    I'd be curious to see what the welds look like from a mig (like mine: 210 miller)


    Nope never tried it. I don't need anymore bottles and i don't do that much of it. But if i had a mixer that would be pretty easy since i have those bottles...Bob
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
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  8. #8
    Join Date
    Jan 2007


    Just finished job using S.S wire. we used tri mix for all but about 3 hrs worth ran out after LWS had closed finished that evening with 75/25 it ran just fine seems like it splattered a little more.

  9. #9
    Join Date
    Apr 2009
    Augusta, GA


    I suggest looking into Praxair's Stargon VS (STAR66) gas, It's designed to be use with Mild Steel as well as Stainless, as good or better than using 75%Argon/25%CO2 for Mild or Tri-Mix for Stainless.

    that is the gas I always have hooked up to my MIG machine, so if i need to do a stainless MIG weld, I just have to switch out the wire and that's it.

    Cost is probably just a tad bit more than C-25, the Stargon VS costs me $30-ish to fill up a 125cf tank.

    Stargon VS is a blend of 82% Argon, 8% Co2, and 10% Helium.

    Stainless does take a little more amperage than mild steel to weld the same thickness.

  10. #10
    Join Date
    Oct 2007

    Default SS MIG Wire

    C-25 or 100% CO2 can be used with most types of gas shielded flux cored SS wire.

    98% argon/ 2% O2 for metal cored

    SS MIG wire, depending on type, uses 95/5 CO2, 97/02 or Tr-Mix 90He/7.5Ar/2.5 CO2 for short arc and 98 Ar/ 2% O for axial spray transfer.

    Know your metals and your wire for correct application

    "Bonne journe'e mes amis"

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