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  1. #1
    Join Date
    Nov 2011
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    Default Trouble Mig welding aluminum

    Hi, I posted this on Welding Web, figured I'd post here as well, get some differing opinions. Trying to mig aluminum and the welds look like rabbit turds. Machine is a MM211 with spoolmate 100, set per manual at 5/70. Wire is Harris 4043 .030. Argon is set at 19cfh. Material is 1/8 thick, gapped at 1/8, brushed and wiped with acetone.IMG00857-20120531-2021.jpgIMG00856-20120531-2017.jpgIMG00858-20120531-2021.jpg
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  2. #2
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    Nov 2003
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    Default

    ARE YOU SURE THAT YOU ARE USING 100PERCENT Argon??? and not a mix like 75/25 like you would use for mild steel??

    You may be drawing boiling off and drawing in impurities and crud into the weld area from the bench surface... try to fixture it so it is in free air and not in direct contact with the bench...
    and
    Clean your area to be welded with something like a clean stainless steel scratch brush to break through the oxide layer...
    Last edited by H80N; 05-31-2012 at 07:24 PM.
    .

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  3. #3
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    Default

    Looks like a gas problem. If you are using straight argon turn it up in the 25-30 range. Make sure you have no breeze or fan blowing. Push the gun with about 1/2" stickout. Can you here the gas when you trigger it?
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  4. #4
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    Default

    Thanks for the replies, I am using 100% argon, same tank I tig with. I hear gas when the trigger is depressed. Stickout is 1/2-3/4 and material was brushed and cleaned with acetone. When I first got it hooked up, it ran a beautiful bead. Then they went to sh*t.
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  5. #5
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    Default

    I just swapped my machine over to the regular gun and the gas back to the mix and ran some beads on steel. They came out fine, so if there is a gas flow problem I wouldn't think its the 211
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  6. #6
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    Default

    How about your fixturing???

    You may be drawing boiling off and drawing in impurities and crud into the weld area from the bench surface... try to fixture it so it is in free air and not in direct contact with the bench...

    Aluminum is pretty sensitive to smoke and impurities...
    .

    *******************************************
    The more you know, The better you know, How little you know......

    “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

    Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

    My Blue Stuff:
    Dynasty 350DX Tigrunner
    Dynasty 200DX
    Millermatic 350P w/25ft Alumapro & 30A
    Millermatic 200

    TONS of Non-Blue Equip, plus CNC Mill, Lathes & a Plasmacam..

  7. #7
    Join Date
    Jan 2012
    Location
    Kansas
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    Default

    Run some beads out away from the joint and see how it does.

  8. #8
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    Default

    I moved the gap out off the bench and attached the ground directly to the material, and kicked the gas up to 30cfh. Looks better. Lots of soot, is that normal?
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  9. #9
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    Default

    Quote Originally Posted by RGalyon View Post
    I moved the gap out off the bench and attached the ground directly to the material, and kicked the gas up to 30cfh. Looks better. Lots of soot, is that normal?
    Soot is normal when Mig welding AL

    You can tweak it a bit more but I get the same thing with my MM211

    The Passport didn't produce as much soot, same spool gun
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  10. #10
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    Default

    Quote Originally Posted by RGalyon View Post
    I moved the gap out off the bench and attached the ground directly to the material, and kicked the gas up to 30cfh. Looks better. Lots of soot, is that normal?
    AHA!!! looks a thousand percent better... the bead looks fine... little soot on the edges won't hurt...
    .

    *******************************************
    The more you know, The better you know, How little you know......

    “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

    Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

    My Blue Stuff:
    Dynasty 350DX Tigrunner
    Dynasty 200DX
    Millermatic 350P w/25ft Alumapro & 30A
    Millermatic 200

    TONS of Non-Blue Equip, plus CNC Mill, Lathes & a Plasmacam..

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