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

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  • 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? Pleaseā€¦..any help would be appreciated. Thank you all.
    Screwdrivers (2) I have one Philips and one straight,
    Hack saw (blade pretty dull)
    hammer (brass, like my b@lls)
    scribe (pretty dull)
    torch (one of those little ones from Ace Hardware)
    wire brush (half worn)
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  • #2
    won't work.....


    • #3
      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

      nothing fancy, just a few hot glue guns for metal


      • #4
        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.
        Millermatic350P/Python, MillermaticReach/Q300
        HTP MIG200
        PowCon 300SM, MK Cobramatic
        ThermalArc 185ACDC, Dynaflux Tig'r, CK-20
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        Purox oxy/ace
        Jackson EQC
        -F350 CrewCab 4x4
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        -Bobcat 250NT
        -Smith oxy/propane
        -Jackson EQC


        • #5
          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.

          * Complete welding, machine, & fab shop *
          * Mobile unit *
          * Finally retired *

          * A man's word is his honor..... without honor, there is nothing. *
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          • #6
            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

            Spool Gun conversion. How To Do It. Below.


            • #7
              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
              211 w/ 100 spoolgun
              lucky's ss digital elite
              victor o/a
              milwaukee tools


              • #8
                The co2 helps carry and stabilize the arc. Without it you will have lots of problems.
                Miller syncrowave 200 runner with coolmate 4
                and wp2025 weldcraft torch
                Miller 125c plasma cutter


                • #9
                  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.
                  Big Blue 400D
                  Trailblazer 302
                  Miller S-32 suitcase
                  12VS suitcase
                  Lincoln LN-7 (BIG suitcase)
                  Victor torches
                  Lincoln 350MP with 35' push-pull gun
                  Lincoln PrecisionTIG 375
                  Spectrum 1000 plasma cutter