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Mig welding gas

Discussion in 'The Hokey Ass Message Board' started by 1950Gasser, Oct 14, 2011.

  1. 1950Gasser
    Joined: Sep 29, 2011
    Posts: 64

    from NJ

    You guys use gas on your mig? If so what kind? I have been researching some mixtures and there is plenty of generic info on the web, but when it comes down to it I would rather ask you guys.

  2. JC Sparks
    Joined: Dec 8, 2008
    Posts: 708

    JC Sparks
    from Ohio

    For general purpose welding of mild steel you need a bottle of 75% argon and 25% carbon dioxide. JC
  3. rafael
    Joined: Jun 28, 2007
    Posts: 194

    from Moody AFB

    i think the most comon i've found is a 75-25, 80-20 argon/co2 mix... im in the same boat you are....
  4. b-body-bob
    Joined: Apr 23, 2011
    Posts: 418


    The guy at the welding shop where you get gas would be a good person to ask too.

    For common steel applications, its either 75/25 or 80/20 Ar/CO2. I can't remember which I've got, but I do remember I asked for one, got the other, and it works fine.
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  5. tommy
    Joined: Mar 3, 2001
    Posts: 14,758

    Member Emeritus

    I just used straight CO2 in my muffler shop. (I can hear the gasps now):D Not exactly NASA quality but it worked just fine for many many years. Never a problem with a weld due to the gas.
  6. ditto
  7. Boryca
    Joined: Jul 18, 2011
    Posts: 663

    from Detroit

    90-10 argon-co2. Lots of guys like the higher CO2 stuff, I prefer more argon. It's not really rocket science though, most any mix will work fine.
  8. Xtrom
    Joined: Mar 23, 2010
    Posts: 947

    from Forman, ND

  9. A Rodder
    Joined: Jul 13, 2008
    Posts: 2,477

    A Rodder

    I recently got a bottle of full argon and I thought something was wrong with my welder. I got the wrong bottle given to me and didn't check it. Airgas also has a 86/14 mix that's fine.
  10. I used straight co2 for years with my MIG which was handy because it has more volume in a small tank than Argon/mixes. When stored at pressures greater than 300 psi it becomes liquid and converts back to gas when released giving more volume of gas for the same size 72/25 tank. The smaller Co2 bottle was handy when taking the welder to another location to use it.

    When I got my TIG welder I switched to 75/25 and finally to straight Argon because it seems to work better than the mixes. My gas supplier doesn't charge me any more for straight Argon than 72/25 either.
  11. Shamedevil
    Joined: Dec 16, 2008
    Posts: 267


  12. krylon32
    Joined: Jan 29, 2006
    Posts: 6,448

    Alliance Vendor
    from Nebraska

    We've been using C25 boxing rails for years, seem to work fine.
  13. oldrelics
    Joined: Apr 7, 2008
    Posts: 1,728

    from Calgary

    The cadillac of mixes= "coogar" = 90 argon 7 co2 and 3 oxy
    Mark Hinds likes this.

  14. this is what i use and i have no complaints after many bottles and many years
  15. speedyg948
    Joined: May 3, 2008
    Posts: 164


    75/25 argon/co2..straight argon for alminum
    '51 Norm likes this.
  16. fbama73
    Joined: Jul 12, 2008
    Posts: 990


    Lots and lots of welding with 75% CO2/25% Argon. I like it just fine. I've MIG welded with pure Argon, and it does fine, as well. I'd like to try straight CO2 sometime as an experiment.

    The main thing with your gas is that it keeps oxygen out of the weld zone.
  17. Hackerbilt
    Joined: Aug 13, 2001
    Posts: 6,243


    Straight CO2 at home and at work we use some mix from Liquid Air.
    I don't see much if any difference...certainly not enough to pay the premium price of the mix!
    If you know someone who services soda fountains and the like you can get a tank from him.
    Its the exact same CO2 and cylinder for that purpose as the ones that the gas supplier uses for small MIG least around here anyway.
    It even has the same threads and plastic washer!
  18. fleet-master
    Joined: Sep 29, 2010
    Posts: 1,770


    CO2 here. its a hotter and more firey weld than an argon mix but cheaper and i get to own the bottle rather than rent it. CO2 works just fine on mild steel
  19. Depends on application.
  20. 64Cyclone
    Joined: Aug 30, 2009
    Posts: 1,496


    I just got a new Hobart Handler and they suggest c02 as an option because it's readily available at most sporting goods stores for paintball guns. Good news for me because I already have a c02 cylinder.

    Here's the small co2 cylinder Hobart offers. Good for about 45 minutes of welding and costs around $5 to refill.

  21. Barnmiester
    Joined: Feb 13, 2011
    Posts: 78

    from wyoming

    The 75%co2 25%argon is what i use every day. Its a great mix for welding carbon steel. Theres alot of options out there but i think 75/25 is the way to go.
    rockable and 1946caddy like this.
  22. I use both, the 75/25 80pnd is 68.00 and the Co2 is 34.00 for a CD50 ( the same size as a 200 oxy. For GP welding I use the Co2 and use the 75/25 for welds the will be visible.

  23. coonassjake
    Joined: Oct 24, 2011
    Posts: 6

    from sealy tx

    75/25 best bet unless you are looking to spray arc where 90/10 is your best bet.
    When tig welding or aluminum mig with a spool gun or push pull gun use argon
  24. ahshoe
    Joined: Sep 12, 2012
    Posts: 764


    I heard awhile back that if your tank of c02 and argon sit quite a long time that you should roll the tank of something like that to remix it. Am I thinking wrong or heard it wrong?...I am having troubles with laying a good bead like it did last time I used it several months ago
    Last edited: May 7, 2020
  25. I'd be interested to hear what folks say about that too. I have an 80/20 bottle that goes over a year sometimes without use.
  26. southcross2631
    Joined: Jan 20, 2013
    Posts: 3,852


    I use 75/25 and I pay 49.00 for a bottle from a welding shop in Cleveland, Tn. Knoxville and Chattanooga get 62.15 for the same bottle
  27. 1946caddy
    Joined: Dec 18, 2013
    Posts: 1,678

    from washington

    75/25 for short arc and 98/2 for spray. Never used it but I hear co2 does spatter more than 75/25.
  28. rusty valley
    Joined: Oct 25, 2014
    Posts: 1,665

    rusty valley

    a while back i was given a full bottle of pure argon, so i hooked it up to my miller 200 wire feed. bad welds for a while until i looked it up on the miller forum and found what i was experiencing, bad looking welds, bad penetration. wrong gas they say. went back to 75/25 mix and the welder woke up again. i have also used straight c02 with lots of spatter and bad looking welds. just buy the right gas thats recommended for mild steel with a mig welder and thats the 75/25 mix
  29. sunbeam
    Joined: Oct 22, 2010
    Posts: 4,914


    I run 80-20 mix with .035 wire in a 250 Miller In a 120v Lincoln with .020 wire for thin stuff I use CO2 because of price. Get a pop machine bottle $20 to fill runs a long time if I can keep my grandsons from filling their paintball tanks from it.
    Last edited: May 8, 2020
  30. ahshoe
    Joined: Sep 12, 2012
    Posts: 764


    Any info about rolling the tank after the argon/Co2 sits awhile?

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