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  • mig welding with CO2?

    I went to my local welding supply to buy a tank of argon 75% CO2 25% gas.
    The guy told me to save my money and just buy the 100% CO2, it will last 5-7x longer than the argon/co2 mix.
    What??? I've never heard of that!!
    I'm only planning on using my millermatic 135 for some small project and body work.
    Is this guy a nut??
    Whats your opinion??
    The secret to life is to live ultimately by one's own hands and one's independent devices

  • #2
    He is correct. The co2 is a liquid that boils off and gives you the protective gas and deeper penetration you may need with a small welder. The 75/25 will give you a weld with less splatter and nicer if you have the power.
    Nick
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    • #3
      Originally posted by sharky8js View Post
      I went to my local welding supply to buy a tank of argon 75% CO2 25% gas.
      The guy told me to save my money and just buy the 100% CO2, it will last 5-7x longer than the argon/co2 mix.
      What??? I've never heard of that!!
      I'm only planning on using my millermatic 135 for some small project and body work.
      Is this guy a nut??
      Whats your opinion??
      He is sort of correct- it only lasts longer because you get more for less $

      Flow rate is Flow rate:

      20# CO2 tank equates to about 174CF of Gas/ by yer flow rate and that is how long it lasts.


      CO2 is usually cheaper and a 20# tank is a blt easier to transport BUT some people don't like the way it welds- produces more spatter. I used it on my SP135 and seemed just fine for me but I wasn't doing body work- but I did do a fair amount of sheet metal work.
      Ed Conley
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      • #4
        I use both in my shop and like the 75/25 better for most work. But when i weld outside its all co2 since most of it is blowing away anyways...Bob
        Bob Wright

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        • #5
          Well then I guess I'll give it a try,
          I just wanted some opinions before I spent the money - since I need to buy a bottle.
          Other than splater, is there any reason not to use co2?
          The secret to life is to live ultimately by one's own hands and one's independent devices

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          • #6
            Originally posted by sharky8js View Post
            Other than splater, is there any reason not to use co2?
            Nope..Bob
            Bob Wright

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            • #7
              You'll need the CGA adapter for your Regulator and don't forget to pick up a teflon washer also.

              http://weldingdirect.com/a8arregtoco2.html
              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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              • #8
                Some of the older Millers were designed to run on it. Like the MM200 for instance.
                If you can control your inductance, you can set your machine to run sweeter when using it. Many higher end mig machines have inductance control.

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                • #9
                  So are you saying my current regulator will not work with CO2?
                  I have a Harris - off a 1989 L-tec or it came off a 2002? Miller 220.
                  My welder is a Millermatic 135 110v.
                  The secret to life is to live ultimately by one's own hands and one's independent devices

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                  • #10
                    Originally posted by sharky8js View Post
                    So are you saying my current regulator will not work with CO2?
                    I have a Harris - off a 1989 L-tec or it came off a 2002? Miller 220.
                    My welder is a Millermatic 135 110v.
                    Yes, It will !!!
                    You need the Adapter Ed, was refering to in the above post.

                    ............Norm
                    www.normsmobilewelding.blogspot.com

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                    • #11
                      Western Ent part # 806

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                      • #12
                        Originally posted by FusionKing View Post
                        Some of the older Millers were designed to run on it. Like the MM200 for instance.
                        If you can control your inductance, you can set your machine to run sweeter when using it. Many higher end mig machines have inductance control.
                        Millermatic Passport is designed to use CO2. It works very well with CO2.
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                        • #13
                          For thin auto sheet metal C25 would be the better choice over CO².

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                          • #14
                            Originally posted by crawler View Post
                            Millermatic Passport is designed to use CO2. It works very well with CO2.
                            You are correct of course.
                            I thought about that after I hit submit and was too lazy to go back and edit... We have the forum for that

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                            Miller Dynasty 700...OH YEA BABY!!
                            MM 350P...PULSE SPRAYIN' MONSTER
                            Miller Dynasty 280 with AC independent expansion card
                            Miller Dynasty 200 DX "Blue Lightning"

                            Miller Bobcat 225 NT (what I began my present Biz with!)
                            Miller 30-A Spoolgun
                            Miller WC-115-A
                            Miller Spectrum 300
                            Miller 225 Thunderbolt (my first machine bought new 1980)
                            Miller Digital Elite Titanium 9400

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