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Thread: 170 Amp MOT Stick Welder

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

    170 Amp MOT Stick Welder

    Home made Microwave Oven Transformer (MOT) stick welder. I based my design on the welder by Daniel B. Hartman (Dan's Workshop). This welder is made from four transformers from old microwave ovens. The transformer secondary coils were rewound, to achieve welding voltage, with 6 AWG solid copper wire. I included two fans from one of the microwaves for cooling. The power adjustable so it can be used with various sized of welding rod. The SCR module used to adjust the power is mounded to a homemade heat sink made from two old aluminum frying pans.

    Input: 240V, ~25 Amp
    Open circuit voltage: 47 Volts
    Welding current: 170 Amps
    Rewound transformer secondary coils with 6 AWG stranded copper wire.
    Variable power provided via SCR module

    Welder installed on the shelf of a cart that I use for welding.
    170 Amp MOT Stick Welder-170amp_welder_640.jpg

    Welder removed from the cart with the top cover removed.
    170 Amp MOT Stick Welder-170amp_welder_indide_640.jpg

    The SCR for the power control mounted to a homemade heat sink made from two aluminum frying pans.
    170 Amp MOT Stick Welder-170amp_welder_scr.jpg

  2. The Following 10 Users Say Thank You to scorch For This Useful Post:

    blkadder (06-16-2015), EnginePaul (10-31-2018), esaenzrn (03-19-2018), Jon (06-15-2015), JRock (11-02-2018), kbalch (06-15-2015), olderdan (03-19-2018), Paul Jones (06-15-2015), rickmcolorado (07-12-2018), Toolmaker51 (10-31-2018)

  3. #2
    Hotz's Avatar
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    Hotz's Tools
    wow great job, congratulations.

    Sorry my mistakes in english.
    to share your tip >>> http://www.homemadetools.net/forum/tool-tips-tricks/ <<<

  4. #3
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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:


  5. The Following User Says Thank You to kbalch For This Useful Post:

    blkadder (06-16-2015)

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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!

  7. #5

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    Great job on the stick welder . Anyone happen to have plans for a small T.I.G. welder for small and hobby welding ?
    Last edited by LESTER MARTIN JR.; 09-26-2017 at 11:48 PM. Reason: left out something.

  8. #6

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    Nice configuration! I've been wondering if more transformers would result in a better device. Seems like you nailed it.

  9. #7
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    I would like to plans as well for a small hobby welding if someone has one. Thanks in advance.

  10. #8

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    tig welder

    has anyone come with plans for a DIY 170 amp tig welder. Iím looking to make such a beast. Thanks😉

  11. #9
    Jon
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    Try this link for homemade TIG welders: Homemade Tools Search: tig welder - HomemadeTools.net


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