Building a Spot Welder From a Transformer

John Baichtal

My interests include writing, electronics, RPGs, scifi, hackers & hackerspaces, 3D printing, building sets & toys. @johnbaichtal nerdage.net

2246 Articles

By John Baichtal

My interests include writing, electronics, RPGs, scifi, hackers & hackerspaces, 3D printing, building sets & toys. @johnbaichtal nerdage.net

2246 Articles

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Screen Shot 2015-07-13 at 4.03.52 PM

Makezine_COTM_Transformers-BadgeManekinen’s spot welder uses a limit switch connected to a moving electrode to trigger the weld current for up to 4 seconds (as set by a pot) while giving the user time to clamp on the electrodes. It produces 2.6V at 1kA.

One cool aspect of the project is that he repurposed the transformer from a Technics SU-V670 stereo amp, and rewound the secondary winding, allowing him to power the welder from wall current.

[Reposted from last year; H/T Michael Colombo.]

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