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  1. #1
    Join Date
    May 2009

    Default What gas for MIG on SS?

    I want to weld SS with my MIG and need some gas. I took a 40 tank to the local welding to get some gas. I was thinking of a Tri-mix. The guy told me that they didn't have a mix in a 40 but I could use argon. It has been a long time since I welded SS, but I thought argon was for AL. What should I look for?

  2. #2
    Join Date
    Nov 2007
    Southern Louisiana


    Argon will work or argon 98 and CO2 2% will work as well. Both can give a good weld but the finish will be gray. Don't go over 5% CO2, the stainless codes don't allow it due to carbide precipitation.

    The gas I like is a 88 argon 18 helium and 1 CO2. The finish on the weld will be the rose or straw color.

    Make sure to check this information with the stainless mfg for the type. You didn't tell us if it was 304, 410 or anything else.

  3. #3
    Join Date
    May 2009


    I'll be welding SS 304 rod for a grill grate. Thanks.

  4. #4
    Join Date
    Sep 2005
    Salem ,Ohio


    Tri Mix is the perferred text book gas. Argon will work but it won't wet out much it just lumps up with tall beads. 75/25 will work in a pinch also. If you can spring for another tank of tri mix thats prob the best way but the other 2 will work...Bob
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
    Birthplace of the Silver & Deming Drill
    1999 MM185 w/185 Spoolgun,1986 Thunderbolt AC/DC
    Spool Gun conversion. How To Do It. Below.

  5. #5
    Join Date
    Oct 2007

    Default "304 Rod?"

    Quote Originally Posted by Tee2 View Post
    I'll be welding SS 304 rod for a grill grate. Thanks.
    You mean you'll be using "308" to join "304."

    These are known as "18-8" steels.

    Here's a suggestion, Blue Max FC-308L (dual shield) can be used with C-25 or 100% CO2. The wire is more expensive, but you already should have one of those 2 gases.

    In your project (grill grate) one would think it would suffice.

    One drawback, is, these FC SS wires are usually only available in 25/33# spools, .045 & 1/16" dia.

    "Bonne journe'e mes amis"

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