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Bare bones battery tab welding
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6PTsocket:
I do not do enough to justify a spot welder. I have seen all kinds of controlled and uncontrolled schemes to do it on the cheap. I just saw a video of a couple of stiff wires soldered to a 500fd/2.7V super capacitor charged and then used as a spot welder. I have seen old microwave transformers have the secondary replaced with a couple of turns of heavy wire and used the same way. In the other end I have seen banks of capacitors charged and then discharged through a contactor.I suppose you could use a big battery, too. In the past I just fluxed and soldered quick with good results but welding is preferred.Any thoughts?
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coromonadalix:
I followed some youtube videos 2 years ago, took an microwave 1.2kw xformer, destroyed / removed the secondary coil, took an zero awg gauge wire, managed to get 3 full turns in it, i had around 3.1 volts at maybe 400 amps ... made the solder clamp with interchangeable cooper needles.
Made an pulse driver, some schematics on google
voila an home made spot welder, did manage to spot weld good awg size metal plates.
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