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Shielding gas for S/S

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  • Shielding gas for S/S

    Hello
    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 pretty...it 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...
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    • #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.

      RG

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      • #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.

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

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          • #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
            http://www.ceilingtrains.com/
            http://groups.yahoo.com/group/sawking/
            http://groups.yahoo.com/group/southbend10k/

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            • #7


              Originally posted by urch55 View Post
              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...
              Originally posted by aametalmaster View Post
              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. ...Bob
              What about what urch55 it's saying? I just got done using stainless wire with C25 (75% Ar/25% CO2) installing 304 stainless muffler on my car, am I in for a rustfest?

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