I suggest getting a soldering iron and some solder and solderable
materials and fluxes of various kinds ..... then experiment.
There is a LOT of literature on soldering, although quite a bit of it is
They don't mix (the solder and oxides). Damaging oxides on the workpiece
prevent adhesion and oxidation of the solder alters its composition and
reduces its volume thus strength. With clean surfaces made by the flux,
there are other problems besides oxides. But that was not in your question.
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