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  1. #1
    Join Date
    Oct 2013
    Posts
    1

    Default 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. #2
    Join Date
    Oct 2007
    Location
    Cave Creek Az
    Posts
    929

    Default

    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

  3. #3
    Join Date
    Apr 2012
    Location
    Ohio
    Posts
    11

    Default

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

  4. #4
    Join Date
    Dec 2011
    Posts
    371

    Default

    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

  5. #5
    Join Date
    Oct 2013
    Posts
    10

    Default 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 at 10:15 PM.

  6. #6

    Default

    Running outershield elite 1/16 at 450 ipm will freeze the regulator with a 35cfh flow rate....I would know....
    Quote 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.

  7. #7
    Join Date
    Dec 2007
    Location
    Los Angeles
    Posts
    2,818

    Default

    Quote 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
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