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  1. #1
    Join Date
    Apr 2010
    Posts
    26

    Default Argon...Straight for MIG welding Mild Steel and Chrome Moly

    Tonight I ran out of Argon/Co2 mix and need to weld in the morning. I have Straight Argon for my TIG welder but have never used it for shielding for MIG process. Is this advisable or not. Any issues I must be aware of if I do use it? Please…..any help would be appreciated. Thank you all.
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  2. #2
    Join Date
    Apr 2009
    Location
    not near you
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    146

    Default

    won't work.....

  3. #3
    Join Date
    Aug 2007
    Location
    arkansas
    Posts
    781

    Default

    it will kinda work, but you wont like what happens, nor will you like havin to grind all the welds back out cause they didnt penetrate
    welder_one

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  4. #4
    Join Date
    Dec 2007
    Location
    southern California
    Posts
    1,783

    Default

    As an experiment, I tried pure argon and .035 70S-6 with my 200 amp mig. Even with the machine turned all the way up, there was practically no penetration and not very good fusion either. Maybe I could make it work with the XMT or 350P running .030 wire, but I have no need to try it.

    You'll be better off waiting till you have the right gas to do your project.
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  5. #5
    Join Date
    Jan 2007
    Location
    Delmont, PA
    Posts
    290

    Default

    Hey kata,
    You didn't indicate the size of bottle you have. I generally use 80 & 125cf bottles in the shop on my units. I keep (2) spares.... a 40cf of C25 & a 40cf of AR. These are for the sometimes weekends of a "just-in-case" as most LWS or other suppliers are closed. A couple 40cf bottles can be inexpensive with some diggin' on C/L or your local classifieds. My (2) spare bottles have saves my a$$ several times.

    Denny
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  6. #6
    Join Date
    Sep 2005
    Location
    Salem ,Ohio
    Posts
    3,911

    Cool

    Years ago i was working midnights and ran out of gas. So i stuck a bottle of pure Argon and went back to welding. Except for a taller bead i couldn't tell the difference. But i was using a Deltaweld 452 with .045 wire and it was cranked up pretty good. Would i do it again. Only if i was on deserted island and thats all there was. But i did do a small job last week for a guy welding a garden tractor exhaust. I had used my spoolgun earlier in the day on some alum and forgot to change the gas back to my new bottle of 75/25. I welded around the pipe and told the guy man theres a lot of Argon in that new bottle. Then i noticed it was pure Argon. Oh well it worked great and looked good too...Bob
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
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    1999 MM185 w/185 Spoolgun,1986 Thunderbolt AC/DC
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  7. #7
    Join Date
    Jan 2010
    Location
    chugiak, alaska
    Posts
    26

    Default

    as previously stated there will be very little penetration. at work sometimes we have specific applications for this and i do it intentionally.
    330 a/bp
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  8. #8
    Join Date
    Oct 2009
    Posts
    306

    Default

    The co2 helps carry and stabilize the arc. Without it you will have lots of problems.
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  9. #9
    Join Date
    Jan 2009
    Location
    Whitehorse, Yukon
    Posts
    279

    Default

    Straight argon will get you by in a pinch. Use lots of heat because it won't penetrate as much but in a pinch I've done it before. It's true that CO2 will help stabilize the arc but it doesn't do THAT much. If it did then you couldn't weld with a 95/5 or a 98/2 argon oxygen mix, which is what is preferred (even necessary) for spray arc stuff. Just lots of heat is the key.
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