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Which gas for MIG-welding steel?

Discussion in 'The Tool Shed' started by jarheadk5, Feb 22, 2006.

  1. jarheadk5

    jarheadk5 1/2 ton status

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    -CO2
    -Argon
    -CO2/argon mix

    I'll be doing sheetmetal (K5 bedfloors and footwells) and some tube/plate/angle stuff (nothing over 1/4" thick) with my new Pro-MIG 135.
     
  2. muscle

    muscle 1/2 ton status

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    CO2/argon mix
     
  3. K5er4Life

    K5er4Life 1/2 ton status

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    me to cofirm
     
  4. jarheadk5

    jarheadk5 1/2 ton status

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    ...And a couple follow-ups:

    -what size cylinder?
    -rent/lease or purchase?

    My first project (after practicing on some scraps) will be a rolling cart for the welder and gas bottle... made from angle stock from an old bedframe. After that, it'll be floors, tailpan, and rocker repairs. After that... I dunno. Maybe a bumper or two. My truck priorities have changed recently, so I probably won't be doing much with it (the welder) for a while after I get the K5 road-worthy again.
     
    Last edited: Feb 22, 2006
  5. gravdigr

    gravdigr 1/2 ton status

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    I would get as big a cylinder as you can afford (within reason) I have the smallest cylinder and it sucks. It always goes empty when I'm in the middle of a project on a sunday and the welding shop is closed.
     
  6. trailblazr81

    trailblazr81 1/2 ton status

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    I have a 20 pound CO2 tank. I mainly use CO2 cuz I have a 5 pound tank to push the beer out of the keg. And if it runs out mid keg, I know I have a back up!! Now thats planning ahead!!! :waytogo: :haha:

    Ive done some frame repairs, made cart for welder, and some thin metal body stuff.
     
  7. cbbr

    cbbr 1 ton status GMOTM Winner

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    I'm still wondering about the lease vs buy question. I have been using flux so far, but a tank is in my near future. Anyone?
     
  8. trailblazr81

    trailblazr81 1/2 ton status

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    flux to MIG is like night n day, whatever it takes to switch now!! I bought one tank then "acquired" a fairly new tank.
     
  9. RootBreaker

    RootBreaker 3/4 ton status Premium Member

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    hmmm where does the gas go on my arc welder ?????? :haha:

    seriously... that is why I havent got a gas welder yet.... not sure of all those fancy thingamobobbers that they have.. :crazy:
     
  10. trailblazr81

    trailblazr81 1/2 ton status

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    The MIG's from popular brands such as Lincoln, etc. are pretty simple. Mine started out flux, then I upgraded it to MIG, next I want to get the aluminum kit. Good detailed instructions n video. Then just practice. I wanna learn stick... the TIG!!:waytogo: And playing with a Plasma is cool!! Cuts like a Frikkin Laser Beam!! :haha: :haha:
     
  11. jarheadk5

    jarheadk5 1/2 ton status

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    Next question...

    What percentage? The GTS Gases website (local supplier) says they have ArgoMix, but there's different numbers after it that don't correspond to the selling volume.
     
  12. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I use 75/25...

    Rene
     
  13. 85mudblazin

    85mudblazin 1/2 ton status

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    If you go CO2/Argon with your 135 ALL you will be able to weld is sheetmetal. I run straight CO2 with my 135 and I can weld up to about 1/8" comfortably.
    The CO2 burns alot hotter then the mix but it doesnt weld as clean. Although even with the CO2 I have zero slag.
    In conclusion, go CO2:D
     
  14. jekquistk5

    jekquistk5 Weld nekid Premium Member GMOTM Winner

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    I like argon/c02 I got crazy penitration with it. A mig is so freaking easy
     
  15. NoReGrEtS

    NoReGrEtS 1/2 ton status

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    coolist tool I think I have ever used:thumb: :saweet:
     
  16. 87k10

    87k10 Registered Member

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    i use 75/25 and it works great
     
  17. spoolnaround

    spoolnaround 1/2 ton status

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    I pulled this off an article on Millers site.

    http://www.millerwelds.com/education/articles/articles70.html
    Filler Metal, Shielding Gas, and Nozzles
    For tubing with a 0.120-in. wall thickness, a good welding wire is a 0.030- or 0.035-in.-diameter, S-6 hard wire (American Welding Society classification ER70S-6).
    Use a 75% argon/25% CO2 shielding gas. Compared to 100% CO2, this mix yields smooth arc characteristics, better pool control, good bead wetting action, good bead control, and less spatter. It also reduces the chance of melt-through on thinner materials because it requires less voltage and lower wire feed speeds than straight CO2. Flow rates are typically around 30 ft3/h.
    Shielding gas nozzles also need to be monitored, cleaned, and occasionally replaced. Depending on the nozzle size and its workload, spatter can build up and impede the proper flow of shielding gas and leave the weld pool unprotected.

    I remember reading somewhere on one of the big welder manufacture sites that CO2 gets the deepest penetration. I will keep looking.
     
  18. camiswelding

    camiswelding 1/2 ton status

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    which gas...
    it depends

    co2 gives deeper penetration and is way cheaper than

    ar/co2... which produces a nicer weld with less smoke and spatter
    ( I prefer ar/co2 and pass the expense along)

    I own all my bottles... the demurage (rent) is expensive after awhile,,, and I like nice clean bottles on my mobile rig to represent how I keep my equipment

    For what you describe I would
    use ar/co2...owner bottle
     
  19. jarheadk5

    jarheadk5 1/2 ton status

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    Bought a 60cu.ft. bottle of 75/25 for $117 at the local GTS Gases store.

    Thanks all for the advice!
     

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