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  1. #1
    Join Date
    Dec 2007
    Location
    Bend Oregon
    Posts
    62

    Default M.I.G. Welding Aluminum

    Hi, I just tried to weld mig aluminum. i get this black soot around my weld. my argon gas flow is at 25 cfm.
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  2. #2
    Join Date
    Oct 2007
    Location
    Cave Creek Az
    Posts
    942

    Default

    It ain't like steel. You need to clean the aluminum well, first with a SS wire brush tehn wipe it down with acetone. You still may get some sooting, but it should wipe off with a rag.

  3. #3
    Join Date
    Jul 2007
    Location
    TEXAS
    Posts
    92

    Default

    gotta push too

    pulling pulls you away from your shielding gas
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  4. #4
    Join Date
    Sep 2005
    Location
    Salem ,Ohio
    Posts
    3,888

    Cool

    Here you go. How to reduce smut...Bob http://www.thefabricator.com/Aluminu...cle.cfm?ID=554
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
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  5. #5
    Join Date
    Jun 2007
    Location
    Camden, SC
    Posts
    156

    Default

    Back your flow down to between 15 and 20. Push, don't pull. As Bob's link states, 5356 is much more prone to smut. Are you used to doing any sort of "weave" with your MIG welding to get nice looking beads? If so, be forewarned that the INSTANT you back up or cross over a hot-but-cooling weld puddle in aluminum, you're going to get smut. I get quite a bit of smut when I'm welding C channel onto corrugated aluminum pipe because of the slight gap variations and because the ripples in the base metal cause me to move the nozzle to/away from the puddle as I follow the contours of the pipe. I use 5356 for added strength and additional corrosion resistance (from possible water runoff contaminants).
    Last edited by BWS29128; 02-20-2008 at 09:53 PM. Reason: Construct Error

    Clint Baxley
    Baxley Welding Service
    Rembert, SC 29128

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