I was on the verge of building a capacitive-discharge spot welder to join a
mess of NiCad batteries for cordless tools.
Then I got to wondering. And wondering. Whether a 90-amp MIG welder would
substitute? Seems like 0.030" wire is pretty close to a spot weld...
Anyone ever try this or something similar?
I guess I could experiment, but preliminary cautions and advice would be
No need. There must be 100 plans on the net.
The simplest seems to be the capacitive-discharge model. You charge up one
or more capacitors whose combined capacity is in the neighborhood of 1 Farad
(with a 12-24V battery charger) and discharge the pack through the substance
to be welded.
There's more to it, of course. The switch is a Thyistron that can handle
2400Amps, and it, in turn is driven by a 12v wall-wart and a doorbell
switch. The electrodes are copper rods, and so on. Parts, however, should be
less than $100.
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