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Different Regulators for 100% CO2 vs 75/25

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  • Different Regulators for 100% CO2 vs 75/25

    Hi, I'm a newbie and just received a Multimatic 200. In watching the different setup video's the one for the MIG on steel with 100% CO2 stated that I shouldn't use the regulator that came with it. The setup for 75/25 steel did not.

    Why is this?

    Thx - Steph

  • #2
    Reg numbers might not be as accurate. I have been using them for many years with both gases, and most of them have a dual scale. Just need the adapter nipple for the 75/25 reg to run it on co2

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    • #3
      Liquid in CO2 tank, makes the vapor gas very cold. CO2 regulators are made with that in mind as well...

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      • #4
        I was told that if one was going to do a lot of pure co2 that a heated regulator would be best as the standard ones can suffer from freezing with pure co2.---Meltedmetal

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        • #5
          100% co2

          Back when I first started CO2 was all we used,welding all day long using a dual stage flow meter. The gauge would get frost on it but would never freeze up. You should not need a heater for it. I have also used single stage Argon/Carbon Dioxide regulators with straight CO2 with no problems. For myself I like to use a C-25 mixture.
          Last edited by bubbaweld; 11-01-2013, 10:15 PM.

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          • #6
            Running outershield elite 1/16 at 450 ipm will freeze the regulator with a 35cfh flow rate....I would know....
            Originally posted by bubbaweld View Post
            Back when I first started CO2 was all we used,welding all day long using a dual stage flow meter. The gauge would get frost on it but would never freeze up. You should not need a heater for it. I have also used single stage Argon/Carbon Dioxide regulators with straight CO2 with no problems. For myself I like to use a C-25 mixture.

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            • #7
              Originally posted by Steph Reed View Post
              Hi, I'm a newbie and just received a Multimatic 200. In watching the different setup video's the one for the MIG on steel with 100% CO2 stated that I shouldn't use the regulator that came with it. The setup for 75/25 steel did not.

              Why is this?

              Thx - Steph
              As mentioned the reg could freeze up so Miller has to put the warning there BUT
              I've been running CO2 with the miller reg no problem.
              I'm just a hobby welder with some projects for my business so not a ton of heavy welding.
              Ed Conley
              http://www.screamingbroccoli.net/
              MM252
              MM211
              Passport Plus w/Spool Gun
              TA185
              Miller 125c Plasma 120v
              O/A set
              SO 2020 Bender
              You can call me Bacchus

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