>A simple spot welder using ...
>
>They call it a resistance solderer.

Resistance soldering is different to spot welding. With spot welding the
current melts the original metal to make the joint. With resistance
soldering you still apply external solder, and it does not (intentionally)
melt the original metal. Resistance soldering is used a lot in model making
using etched brass as the items to be joined.

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