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Thread: ac/dc alum weld

  1. #1

    Default ac/dc alum weld

    I have a lincoln tombstone ac/dc welder. What would be the best way for me to weld aluminum. I have an old airco 300 amp water cooled tig torch and a homemade water cooler I made from a bucket and pond pump. I been running on dc- under 180 amps with no overheating problems. Could I tig on dc+ without killing my pump or would the power backfired into the water causing problem? Or just aluminum stick it?

  2. #2
    Join Date
    Dec 2007


    Dr. welding,

    You could try scratch starting tig on AC but it would be easier to use DC and alum stick electrodes.
    Attached Images Attached Images
    Thermal Arc GTSW400, Airco Heliwelder II, Miller Dynasty 350, Hypertherm 1000, oxy-fuel setup, metal cutting bandsaw, air compressor, drill press, etc.:

    Call me the "Clouseau" of welding !

  3. #3
    Join Date
    Feb 2013
    North Dakota

    Default ac/dc alum weld

    You let me know how that works out?!?!

  4. #4
    Join Date
    Jul 2011
    Huntington, NY


    Theres no RELIABLE way to weld Aluminum with what you have.

    Once you add on a high frequency box, you can try. You still won't have amp control though.

    Learn from my mistakes. I tried the same thing with the same unit. In the end, it's cheaper to buy a dedicated ACDC tig welder. You will not gett good results.

    As for stick welding Aluminum, try it on a test piece first. It's a hot, fast milky mess that burns through really fast and is hard to control.

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