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Thread: DIY MOT STICK WELDER DANGER DO NOT TRY THIS

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    DIY MOT STICK WELDER DANGER DO NOT TRY THIS

    For some time I wanted to build a MOT stick welder. Well I got a transformer from an old microwave oven and tore the secondary wingdings out. Rewound the secondary with # 12 AWG left the primary winding intact. So I needed another transformer I found on in an old 12 volt battery charger this thing is huge.I tore the secondary winding off and damaged the primary winding. so I replaced the primary winding 180 turns and the secondary winding and they must wind in the same direction. Here is where I messed up since this transformer was much bigger I used # 10 AWG for the secondary note the other transformer done with #12 AWG wire. Well the secondary's must be wired in series while the primary needs 120 volt from two different sources.
    I got it hooked up got one rod burnt looked over and smoked the little transformers secondary winding. Rewound 18 turns with #10 AWG and I am welding away just fine.DIY MOT STICK WELDER DANGER DO NOT TRY THIS-transformer.jpg
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    kbalch (03-06-2015)

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    500+ Homemade Tool Plans

    Glad you got it working without too much damage.

    Let's see a photo of the finished unit; we'll get it added to the site straightaway!

    Ken
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    Thanks for the post, ken4uall. Members here who are looking to build a welder will be forewarned.


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