I have a transformer from a UPS.
High-voltage side:
Low-voltage side:
Is it a good idea to convert it to a spot welder? I am worried about the flimsy cables on the high-voltage side.
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For spot welding you need high current at low voltage, so you will use the transformer to decrease voltage. You should completely remove the primary (high voltage side) winding and replace it with just a few (maybe two) turns of thick cable for the welder and input power from the battery to the formerly-low-voltage side (now it is higher) which should have thick enough wires. So you won't use those thin high-voltage-side-wires anyway.
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1\$\begingroup\$ HV is mains in this case. It's NOT a MOT. \$\endgroup\$ Commented Feb 23, 2023 at 18:27