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  • Welding Stainless Steel Exhaust Pipe

    Hey,

    I'm planning on installing a Magnaflow Stainless Steel (304) exhaust system for my Dodge Cummins. I am going to buy a 2 lb spool of 308L SS wire (about $20) and use one of my wire welders (Miller 251, Miller Vintage, Hobart 140) to weld it up instead of using the stupid clamps.

    My question is can I use my standard 75/25 gas or am I going to need to use a tri-mix or straight agon????

    I don't want it to rust as that is why I am dishing out the $$$$$$ for the stainless setup!!!!! It isn't going to be X-Rayed or anything, and I know I can just use mild steel wire to weld it, but that will rust!!!!

    I have argon off of my TIG so that would be ok, but the tri-mix isn't cheap and I don't plan to weld that much SS with the wire feed. I usually use my TIG for SS but that would be a huge pain is the @$$!!!!!!

    Let me know what you guys think.

    Thanks,
    Winslow

  • #2
    you should be able to rent a small bottle of tri-mix from your LWS... it's what I do in the rare times I have to weld stainless. Buuuuut.... before you weld your whole exhaust system, you might want to consider ease of service... it would suck to have to cut your exhaust out when something on the truck needs to be repaired....
    Bobcat 225NT
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    • #3
      mig ss

      I was told by the pipe welder at work that you can get s.s. flux core self shielding wire but he didn't know if you could get it in small enough diameter to weld exhaust pipe. No gas required.

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      • #4
        stainless exhaust system

        I always tigged mine and used straight argon and purged the system as well.
        I made mine from 304 stainless tube.
        I have been a tig welder for years in the dairy and bakery industries, stainless will crack if its not welded properly. mig may be OK but tig would be better and be sure to get 100% penetration.
        I had stainless on three different vehicles and never a problem.
        mike sr

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        • #5
          Hey,

          This is an exhaust system, not gas line pipe!!!! 100% penetration isn't really necessary, and it seems like it would be a pain to get the TIG under the truck, on your back, just to weld it up. I've seem guys just use regular mild steel wire on stainless and never have a problem other than rust!!!!! Ya you get a little sugar in the weld, but it's not going to fall off!!!

          As far as service goes, I will be able to disconnect from the down pipe and I might not weld on side of the muffler for servicing?!?!?!? I'll look at that when I get to there and decide from that!! Thanks for the advice!!!!

          I will have to check into the tri-mix rental??? I wonder how high dollar that could be???? Isn't standard mix MIGing SS: 90% Helium/8% Argon/2% CO2???

          Thanks for your thoughts!!!!!!!!!!!!

          Thanks,
          Winslow
          Last edited by Prowelder; 08-29-2009, 09:02 PM.

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          • #6
            Hey,

            BTW- I'm not saying 100% pen isn't good, as most stuff I do I want 110%, but on on this project that just isn't really worth spending hours and hours on just to gain a marginally important factor!!!!!! Thanks and I really understand what your saying!!!!!!!!!!!!!!

            Thanks,
            Winslow

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            • #7
              Tig would be a pain under the car, I always fit mine and welded it up then put it on the vehicle.
              Piping stainless was my line of work for years, its just easier for me to do it this way.
              good luck with your project.....
              mike sr

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              • #8
                Originally posted by Prowelder View Post
                I will have to check into the tri-mix rental??? I wonder how high dollar that could be???? Isn't standard mix MIGing SS: 90% Helium/8% Argon/2% CO2???
                If memory serves, my LWS (Valley National Gases) charges $7/mo for a small bottle rental + the cost of the gas. I don't use it enough to remember what the exact gas mix is...
                Bobcat 225NT
                Cutmaster 52
                Lincoln Weld-Pak 100 buzz box
                Caterpillar TH63
                '07 Kawasaki ZZR600

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                • #9
                  Originally posted by popspipes View Post
                  Tig would be a pain under the car, I always fit mine and welded it up then put it on the vehicle.
                  Piping stainless was my line of work for years, its just easier for me to do it this way.
                  good luck with your project.....
                  Hey,

                  I'll have to look at it a little closer...I might be able to fit it under the truck, then pull it out all together and TIG it on the bench... I'll have to see. Is that what you do??? Do you tack it together with MIG or use clamps???

                  That would be a lot easier... if I could get the system out in an unit. Thanks!!!


                  If I decide to go the MIG method, I'll look into what it cost for bottle. That is a good option. Thanks!!!

                  Thanks,
                  Winslow

                  Comment


                  • #10
                    The most common mixture for tri-mix gas is 90%He + 7-1/2%Ar + 2-1/2%CO2
                    Last edited by Don52; 08-30-2009, 07:56 PM.
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                    • #11
                      Originally posted by Prowelder View Post
                      Hey,

                      I'm planning on installing a Magnaflow Stainless Steel (304) exhaust system for my Dodge Cummins. I am going to buy a 2 lb spool of 308L SS wire (about $20) and use one of my wire welders (Miller 251, Miller Vintage, Hobart 140) to weld it up instead of using the stupid clamps.

                      My question is can I use my standard 75/25 gas or am I going to need to use a tri-mix or straight agon????

                      I don't want it to rust as that is why I am dishing out the $$$$$$ for the stainless setup!!!!! It isn't going to be X-Rayed or anything, and I know I can just use mild steel wire to weld it, but that will rust!!!!

                      I have argon off of my TIG so that would be ok, but the tri-mix isn't cheap and I don't plan to weld that much SS with the wire feed. I usually use my TIG for SS but that would be a huge pain is the @$$!!!!!!

                      Let me know what you guys think.

                      Thanks,
                      Winslow
                      Powerwelder,i have five of those trucks,if you weld it on the truck be sure to take all battery cables off the batteries welding is very hard on ECM and PCM.Just a thought NAPA makes a very nice 3 " wide 2 bolt exhaust clamp if you ever need to take it off after welding it's going to be a pain....
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                      • #12
                        Ss fcaw

                        Originally posted by cah8861 View Post
                        I was told by the pipe welder at work that you can get s.s. flux core self shielding wire but he didn't know if you could get it in small enough diameter to weld exhaust pipe. No gas required.
                        Lincoln Blue Max FC-308L is a gas-shielded flux-cored stainless wire and uses either C-25 or 100% CO2. Smalles roll is .035/10# spool for just under $90.00

                        ESAB manufactures "Core-Bright" self-shielded wire, available in .045 & 5/64" dia. 25# spools. Price? Take a guess.

                        Good luck

                        Dave
                        "Bonne journe'e mes amis"

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                        • #13
                          Originally posted by Prowelder View Post
                          Hey,

                          I'll have to look at it a little closer...I might be able to fit it under the truck, then pull it out all together and TIG it on the bench... I'll have to see. Is that what you do??? Do you tack it together with MIG or use clamps???

                          That would be a lot easier... if I could get the system out in an unit. Thanks!!!


                          If I decide to go the MIG method, I'll look into what it cost for bottle. That is a good option. Thanks!!!

                          Thanks,
                          Winslow
                          I use the old pipe, remove it and fit the new one just like the old one, I used to cut the ells to get the exact bends etc.
                          It may be easier to have a muffler shop bend what you need, I have done that too. Bolt it on the vehicle, dont weld it in place as you may need to remove it at somne point............
                          mike sr

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