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Shielding gas for S/S

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  • Shielding gas for S/S

    Not a welder, but have been known to stick a few pieces of metal together over the years. My question is, do you have to use the tri-gas mix for 304 S/S, or will 75/25 argon mixture do in a pinch? I'm welding a patent dipper to use for trotline crabbing, so it does not need to be just needs to work. Any help would be appreciated.

  • #2
    Two gas mixtures are the most popular #1 Tri-Mix=(90% He/7.5% Ar/2.5% CO2) #2 C2 98% Ar/2% CO2. If you use C25 (75% Ar/25% CO2) you will have rust problems so it will defeat the purpose of having stainless in the first place...


    • #3
      No Prob

      I made grates for my grill using 75/25 and 304 SS rods. CO2 makes weld hotter and a little more spatter but works just fine.



      • #4
        Since this thread was brought up again, and may be confusing, all of the above are correct. If you are using GMAW in short-circuit transfer on a non-critical job, you will likely be ok, but the gas of choice on a production run using spray transfer would be different as would the gas for GTAW. The choice of gas is dependent on process, transfer, and quality needed, but, "in a pinch", C25 wil do.


        • #5
          Originally posted by jaway809
          co2 is regular and better
          Same wrong information as you posted in another thread! Doing some ignorant trolling?


          • #6
            There is some gas flux core SS wires that are great and you don't need tri mix. Co2 or 75/25 will work just fine. They are avail in 2# spools so you don't need to buy a giant spool. Lots of shops are going to it since they already have CO2. We sell lots of it and I will get some 2# spools to sell. Its avail in 308 and 309 which should cover lots of different SS. I now work for my LWS and know first hand...Bob
            Bob Wright, Grandson of Tee Nee Boat Trailer Founder
            Metal Master Fab
            Salem, Ohio
            Birthplace of the Silver & Deming Drill