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  • Tig Question

    What would happen if you used C-25 gas instead of straight argon to tig? Just curious. Don
    MM 210 w/Spoolgun
    Cutmaster 38

  • #2
    dorn,

    Your welds would be black and contaminated. You would also contaminate your tungsten and cups. It's about the most ugly welds you will see. T.I.G. stands for Tungsten-Inert-Gas and CO2 is not an inert gas. CO2 is a reactive gas.

    Hope this helps.

    Andy

    Comment


    • #3
      Andy, Thanks for the fast responce. I did not think it would work. Owell guess I have to spring for a tank of argon. I want to set my Maxstar 150stl up for tig and was hoping to save acouple bucks. Thanks Don
      MM 210 w/Spoolgun
      Cutmaster 38

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      • #4
        what about 75%/25% Argon/CO2 mix?

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        • #5
          sladuca,

          Still no go! You still have a reactive gas in the mix (CO2). TIG: Tungsten Inert Gas. You can run 100% argon for most procedures. A helium addition of 25%, 50%, 75%, 90% to argon will increase your heat for welding thicker and/or larger weldments. Certain specialty applications use an argon/nitrogen mix, but not for steel. Other procedures require an argon/hydrogen mix. Argon and argon/helium mixes are the most common for TIG welding aluminum. Argon is the most common gas used for steel, stainless, and chrome moly .

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          • #6
            thought you needed ac tig for aluminum maxstar dc only? im confused ???i thought i would need atleastecono or syncro to tig alum. little help here plz
            thanks for the help
            ......or..........
            hope i helped
            sigpic
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            • #7
              fun4now,

              Yes AC is required for aluminum TIG. It is possible to weld aluminum with DCSP with pure helium under special circumstances. This procedure is typically used with higher amperage applications 300+ amps.

              AC is the recommended method for aluminum TIG. Lean toward a Dynasty 200DX if you can afford it. The Syncrowave 180SD is also a nice machine. Stay away from the Econo-Tig as it has a very low duty cycle and lacks the features necessary for someone wanting to weld much aluminum on a regular basis.

              I hope this helps. I am partial to the Dynasty series inverters. The Syncrowave 180 and 250 are also very nice machines.

              Comment


              • #8
                Syncowave

                The Syncrowave are really nice units. I own a 180 and use a 250 at my new job building Aluminum jet boats. lots of fun mostly wire with the XR push-pull system.

                Gary
                Dry Creek Welding
                Dynasty 300DX Tigrunner
                Trailblazer 302
                Spectrum 2050
                suitcase 12RC

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                • #9
                  Do you find the CC current of the 250 to be advantages to AL Gmaw? I have just gotten a Cobramatic and want to use it with a 250 synchrowave or my Dynasty 200. I am looking for feed back, thanks, Paul
                  More Spark Today Pleasesigpic

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                  • #10
                    I am not sure what you are asking.

                    But we dont use the 250 to power the XR push-pull

                    its a small unit about the same size they use for a power supply its kinda hidden. never took a good look at it.

                    Gary
                    Dry Creek Welding
                    Dynasty 300DX Tigrunner
                    Trailblazer 302
                    Spectrum 2050
                    suitcase 12RC

                    Comment


                    • #11
                      Paulrbrown, You are not going to want to power your Cobramatic witha CC power source. There are absolutely no advantages to CC for mig welding. You will be much happier with a CV power supply. I am not sure what your Cobramatic consists of, so I can't say for sure what you need for a power supply.

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                      • #12
                        I agree with klms54.

                        The CC powersource will have a small window of operation where it works good, otherwise it's a pain to fine tune properly. Can it be done....yes, done right...not really. A CV unit will be a good match up for the Cobra.

                        A

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                        • #13
                          Thanks, I had read AWS recomends CC for heavier wires, and ESAB does also, they just don't specify wire diamater, The Cobramatic has wire speed run in, so you can establish arc before main feed speed kicks in. I will have to try both CC and CV, I also have a Millermatic 250MP which makes setting voltage very accurate plus a Bobcat225NT. I will let you know how it works. Paul Brown
                          More Spark Today Pleasesigpic

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                          • #14
                            Paul,
                            Some push pull systems have a setting to let them run as a "Voltage sensing" feeder to use with a CC powersource. The Syncrowave would not be my first choice to do this with buy it works nice with other CC units and some engine drives.
                            You Cobra should be fine on the 250 with the right connections or adapter.

                            Good luck
                            Andy-

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                            • #15
                              paulrbrown,

                              The CC/CV voltage sensing feeders like the Miller 8VS/12VS suitcase feeders work great on larger wires such as 3/64" up to 5/64". Traditionally the trend has been toward flux cored wire. You can also spray arc with .035" ER70S-6 and up with a hot gas like 92%argon/8% carbon dioxide with good results on such a feeder. A larger wire diameter capacity voltage sensing feeder like the S-32SL is great for the 5/64" to 7/64" wires.

                              Typical short arc mig is best done with a CV power source and a constant speed CV feeder such as the 22A or the 8RC/12RC suitcase feeders. As Andy stated mig welding with aluminum and a voltage sensing feeder affords a very small voltage/wire speed window per wire diameter and is bear to tune in.

                              The XMT series is a really nice powersource that will run CC/CV voltage sensing feeders, true CV feeders, DC TIG, and STICK. The Cobra-Matics use to be adaptable to Miller power sources and are fine feeders.

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