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Homemade Spot Welder


I had a dead microwave oven transformer so i sawed off the secondary and replaced it with 2 turns of very thick wire. I then made a simple yet very effective spot welder.

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10 Responses to “Homemade Spot Welder”

  • elkman123123:
    October 10, 2009 at 3:33 pm

    Great Job, and for a lot less money than a commercial product! Can be customized, for example, if someone wanted to use smaller tips for miniature and hobby welding applications. I didnt know you could saw off the secondary of a Microwave Oven Transformer, and replace it with a couple of turns of Heavy Gauge wire. This is a great project. Thanks for sharing it with the rest of us.

  • pivotboy63:
    October 10, 2009 at 4:30 pm

    you use a microwave oven transformer because they are the easiest to find and can be had for little to no dollars

  • brianc5000:
    October 10, 2009 at 4:39 pm

    It would be cool if you could make some Copper electrodes instead of the mild steel ones your using. I believe you could get a little better current flow that way. But know you were using what you had available to you, so great job.

  • BKSF1:
    October 10, 2009 at 4:46 pm

    EVERYONE SHUT UP.

  • harsha806:
    October 10, 2009 at 5:05 pm

    smart man.

  • JozeyHall:
    October 10, 2009 at 5:54 pm

    yeh, but an ipods transformer isnt modified to send radioactive waves at the speed of light into a cavity your meant to put your food. the least you could do is google it but if you cant be fucked, then its your problem. a uni in 1991 studied that eating food cooked in microwaves posed a greater risk of cancer because it deforms the nutrients in the food, im pertty sure they built a fairly thick metal cover around them to prevent the radiowaves getting into our body

  • wav3form:
    October 10, 2009 at 6:02 pm

    A microwave’s transformer doesn’t do anything like that. The magnetron does. People on youtube are so fucking stupid.

  • stalkersas:
    October 10, 2009 at 6:30 pm

    my friend, u have no idea what u are talking about !!! the gui here took out the secondary, high voltage winding, and put in 2 turns of verry thick wire. if transformer is like 800w-1kw, it means 1.4 windings/ volt. so the gui gets @1-1.2v. to get to 1 kw with 1 volt, u need amps, A TON OF THEM 800-1000 more precisely. when he melts the wire, it dont pass that much, but even half is enough to melt it. the idea is to dump energy through resistance. copper has low resistance, iron high

  • stalkersas:
    October 10, 2009 at 7:08 pm

    and more energy is dumped at the spot between 2 iron pices then at iron on copper. when a hot spot apears, that is like a hall in a big sand sac, the hall gets biger and biger. the resistance of the spot grows and the energy dumped there is biger, and melts the metals together. the power is distributed in teh entire sistem (coil, bolts, pices to weld…) but it is dumped depending on the resistance, so all the sistem gets like half, and the weld spot the other half. but varies alot in time.

  • bperryrm:
    October 10, 2009 at 7:40 pm

    Are you joking? A microwave transformer doesn’t give off radiation any more than the transformer you use to charge your ipod does. Microwaves just happen to have a larger one to handle the current.

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