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Microvawe transformer spotwelder. Is there a way to improve it?
(lemmy.dbzer0.com)
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Are you able to measure the input current during a weld?
I suspect you might not have enough copper in the secondary. Fully insulated wires take up a lot of space; there's a reason magnet wire is commonly used. Several parallel turns of e.g. 6mm^2 magnet wire would be preferable.
Your SSR generally should be in the phase, not the neutral.