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Technical Stainless MIG welding?

Discussion in 'The Hokey Ass Message Board' started by tubman, Jan 25, 2023.

  1. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 10,029

    Bandit Billy

    I just welded them like anything else. Pressurize the tubes?
    Just Gary likes this.
  2. aka: "back purge"
  3. oliver westlund
    Joined: Dec 19, 2018
    Posts: 1,934

    oliver westlund

    I just went through this with the welding shop, not the same gas and you wanna make sure you get the same type of ss wire as the ss you are welding. I also just had a guy show me his grill insert he made, he welded ss with regular wire and gas. He planned to paint it though...just illustrating that its possible although not ideal
    AccurateMike likes this.
  4. SEAAIRE354
    Joined: Sep 7, 2015
    Posts: 511


    Another option that I’ve used is stainless flux core wire that also uses gas as well. It welds really smooth although it may be a bit much on thin material. A buddy of mine just picked up a spool of gas less stainless flux core which i didn’t know existed. I’m anxious to see how it welds.
  5. Mr48chev
    Joined: Dec 28, 2007
    Posts: 32,396


    Tri mix is what what was normally used to Mig weld stainless when fabbing stainless in the fruit juice/apple sauce plant I did the maintenance purchasing in for a few years. All the sanitary stainless tubing was tig welded though.
    Tow Truck Tom and alanp561 like this.
    Joined: Jun 6, 2007
    Posts: 4,722


    That'sa beautiful looking car.
    Bandit Billy likes this.
  7. deathrowdave
    Joined: May 27, 2014
    Posts: 3,098

    from NKy

    I just welder a ton of 10 gauge SS , using my MIG , SS wire , 75/25 gas . It welded fine as wine . Welding SS auto trim , is TIG for me . I can be done with a MIG but be prepared to blow holes in it . You can not be a welder by reading or watching it done . Practice makes perfect .
    Just Gary, alanp561 and Tow Truck Tom like this.
  8. FWIW the companies that build exhaust systems for OEMs do miles and miles of MIG welds every year, welding different types of stainless to a bunch of types of metal, and they don't back purge anything. Warranty claims on exhaust systems (including welds) are very rare, or at least were on the stuff I worked on.

    I did validation testing for a while, I tested every welded joint on the exhaust system to failure to predict if it would last the life of the vehicle. When a weld didn't meet expectations (rare) it was never because of the type of weld. They can and do MIG weld stainless literally all day long.
    Just Gary and alanp561 like this.
  9. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 10,029

    Bandit Billy

    Thanks for that!
  10. Mr48chev
    Joined: Dec 28, 2007
    Posts: 32,396


    That is one car you really have to see in person to know how great of a job he did on it. I took a bunch of photos of it at Hot rod Arama last summer but he had it hiding in the shade because it was so blooming hot there.
  11. gene-koning
    Joined: Oct 28, 2016
    Posts: 3,316


    I did lots of stainless steel welding at my jobber welding shop. Mig welder, stainless wire, 75/25 gas. Lots of patching up fast food industry in our town, kitchen stuff like fryer baskets, stainless tables, pot & pan handles, utensils. Changed the wire to the stainless, welded, then changed the mig back to steel wire after the job was done.
    MMM1693, Just Gary and alanp561 like this.
  12. BrerHair
    Joined: Jan 30, 2007
    Posts: 4,866


    Well boy howdy, damned interesting stuff fellas. Never welded ss but need to, was thinking I needed tig, but you all have, as my kids said when they were little, changed-ed my mind.
    Just Gary likes this.
  13. chopolds
    Joined: Oct 22, 2001
    Posts: 6,110

    from howell, nj
    1. Kustom Painters

    I've actually done stainless wire, in a MIG, 75/25, on a car's stainless trim. As said, much easier, and better to use the TIG. But MIG will work. You should have a machine with very fine temp and wire speed controls, as it's difficult to get them just right with the super thin SS. You also need to have a delicate touch with the grinding/sanding operation, as it does leave a high bead, that you have to knock down. The other (possibly big) drawback, is that the weld will be a slightly different color than the car's SS. They didn't use 316 or 304 for trim, probably a proprietary alloy, maybe for draw quality? Best to TIG it, using very thin strips cut from the same moldings that were on the car.
    X38 likes this.
  14. cfmvw
    Joined: Aug 24, 2015
    Posts: 959


    Seen it done, but never tried it myself. I've also seen aluminum MIG welded; kind of messy, but it did the job. We're gearing up to do 3D metal printing repairs on existing parts at work rather than doing sleeve or welding repair...will be interesting to see how that works out for trim repairs as the technology filters into the private sector.
  15. Budget36
    Joined: Nov 29, 2014
    Posts: 10,848


    I’ve welded SS angle irons up for several battery hold downs for my dads trucks. Many brackets as well to replace aluminum stuff. 75/25, nonSS wire. Sure, the welds would surface rust over, but eliminated cracking.
    To me it welded like any other steel.
    AccurateMike likes this.

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