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  1. #1
    Super Member texasjohn's Avatar
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    Default Stainless Steel MIG welding?

    I've got a Miller 172 MIG welder, 220 volt. I have a bunch of stainless steel legs from office tables that I want to weld up for various things.

    So far, I think I understand that this rig will do the trick and I plan to use the following.... what am I missing?

    ER308L Wire, .35mm, flux core
    reversed polarity
    5/8" to 3/4" stick out for the wire.
    Argon gas with 2% CO2
    A stainless steel brush to remove slag

    I searched, but didn't see where stainless steel mig welding has been discussed recentl.
    Joy is having the tools you need and needing the tools you have!

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  2. #2
    Platinum Member bobodu's Avatar
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    Default Re: Stainless Steel MIG welding?

    We weld stainless at the plant running stainless wire and tri-mix gas.Never heard of flux wire and gas....
    Here's a search with lots of relevent info.
    MIG stainless - Google Search
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  3. #3
    Elite Member wushaw's Avatar
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    Default Re: Stainless Steel MIG welding?

    I have not done any stainless yet so I have a question as to why do you need shielding gas for a flux core wire....is it a flux core wire???

  4. #4
    Veteran Member crbr's Avatar
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    Default Re: Stainless Steel MIG welding?

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  5. #5
    Super Member texasjohn's Avatar
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    Default Re: Stainless Steel MIG welding?

    Here's where I've been...

    Untitled Document
    says use Argon with 2% CO2
    also 308L wire (I can't tell if this is cored or not)

    Procedures: Stainless Steel Welding
    clearly says use flux wire

    Miller - MIG Welding Tips - Intro
    says use gas and I can't tell if the ER308L wire is flux core, or not.

    This ambiguity is why I asked the question so that I could get clarification from somebody who has actually done it..... in a home shop where equipment is not massive and costs need to be realistic.

    My appllication is in no way critical to food or big strains... I simply have this large supply of 1 inch square, 30 inch long table legs and want to glue them together into useful things.

    I've even seen where people simply use their regular flux core wire, reverse polarity and go.... the welds likely will rust, they they say it works fine.... anybody got a comment on this technique?
    Joy is having the tools you need and needing the tools you have!

    Kubota 5030 HSTC, BB, Danueser PHD, LA853 QA HD FEL w JD toothbar, 3pt chisel, 3 pt disk, 6' shredder, Kubota FEL hay spike, 3pt hay fork w carryall, Kubota RTV 1140

  6. #6
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    Default Re: Stainless Steel MIG welding?

    Well I am definetally not schooled on this stuff or that great of a welder, but I just bought a roll of solid stainless steel welding wire and put it in my mig. I'm still running 75/25 Argon/CO2 that you would normally use for mild steel.

    So far I haven't had any problems with any of the welds I have done. I did this for making the exhaust for one of my trucks. I used SS mandrel bends and tubing.

    My welder says to use SS wire with a helium/argon/co2 mix. I think it was a 90/7.5/2.5 mix.

  7. #7
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    Default Re: Stainless Steel MIG welding?

    Here is a discussion of yor question on WeldingWeb, it starts to get good at around post 15. Post 20 is most pertinent.
    How come MIG worked on stainless steel? - WeldingWeb™ - Professional Welding Forum

    I have thought about it some myself - then I inherited 25lb of SS stick rods in cans - they weld really nice using DCEP.

    Brad
    2006 Kama 554, 92 Belarus 250AS, Bombardier Outlander Max 400.

  8. #8
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    Default Re: Stainless Steel MIG welding?

    I have used regular flux cored wire is stainless without any problems. The weld will rust, but you could just paint it.

  9. #9
    Super Member texasjohn's Avatar
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    Default Re: Stainless Steel MIG welding?

    Good input, thanks, Brad, for the link!

    Gmurphy, did you reverse polarity when you used regular flux core wire on stainless?
    Joy is having the tools you need and needing the tools you have!

    Kubota 5030 HSTC, BB, Danueser PHD, LA853 QA HD FEL w JD toothbar, 3pt chisel, 3 pt disk, 6' shredder, Kubota FEL hay spike, 3pt hay fork w carryall, Kubota RTV 1140

  10. #10
    Platinum Member Raspy's Avatar
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    Default Re: Stainless Steel MIG welding?

    I use the 309/316 solid wire with mine. I weld mild steel and stainless and it works very well. The 309/316 wire is very good for temperd steel and to resist cracking. Table legs are probably quite thin and the little mig welders are perfect for that.

    Wetspirit

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