Re: Battery tag spot welder.
Just a quick follow up, the secondary windings of the microwave transformer will have to be cut out and drilled (pig of a job)removing every winding except the primary one, then I used 10mm2 tri rated cable as it is easier to use, double it up to give 2 turns in parallel = 20mm2 on the bobbin leaving plenty of length to connect to the choc connectors, try to avoid any joints as they can give you a hot spots, I have done a rough thumb nail of the circuit will do a better drawing later if required.
John
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