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Originally Posted by mrmephistopheles
that's not welding, that's melting.
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Welding is melting too, what he described is soldering, where you heat up one metal enough to open up the pores, and the other metal enough to melt and go into those pores.
Welding is melting both metals, of the same, or simialar alloy and them becoming one piece.
no a propane torch won't be enough to weld aluminum.