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Thread: 70 Amp MOT Stick Welder

  1. #1
    scorch's Avatar
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    scorch's Tools

    70 Amp MOT Stick Welder

    Home made Microwave Oven Transformer (MOT) stick welder. I based my design on the welder by Randy Gross (Homemade 70-Amp Arc Welder). It looks like Randy's web site is gone now but my welder lives on. This welder is made from two transformers from old microwave ovens. The transformer secondary coils were rewound, to achieve welding voltage, with 10 AWG solid copper wire. I included a fan from one of the microwaves for cooling.

    (EDIT: here is a link to an archive of the original AAA Welder web page that I used as a guide to construct this welder.
    https://web.archive.org/web/20100411...com/70amp.html )


    Input: 120V, 20 Amp
    Open circuit voltage: 40 Volts
    Welding current: 73 Amps
    Rewound transformer secondary coils with 10 AWG solid copper wire.
    Welds best with 5/64 welding rod

    70 Amp MOT Stick Welder-p5080013-2-custom-2-.jpg

    70 Amp MOT Stick Welder-p5080012-2-custom-2-.jpg

    70 Amp MOT Stick Welder-p5080001-2-custom-2-.jpg
    Last edited by scorch; 02-13-2016 at 08:31 PM.

  2. The Following 5 Users Say Thank You to scorch For This Useful Post:

    Altair (05-24-2015), Christophe Mineau (05-21-2015), Jon (05-21-2015), kbalch (05-21-2015), Terer (09-12-2017)

  3. #2
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    Thanks scorch! I've added your Stick Welder to our Electrical category, as well as to your builder page: scorch's Homemade Tools. Your receipt:


  4. #3
    Content Editor DIYer's Avatar
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    Cool build! Thanks for the share.

  5. #4
    Content Editor Altair's Avatar
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    Nice work scorch. Looks like I'll be scouring for old microwaves now.

    Al

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    This thread has been moved to the Must Read subforum. Congrats (and thanks) to scorch for making such a valuable contribution!


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