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@markrjohnson
Melting point of aluminium 660C
Agree on the braze 425 - 450C.
However heating the frame to melt the alu will probably screw the frame tube heat treatment.
Caustic disolves alu, so go with the caustic soda (100% sodium hydroxide)(NaOH)
See this: YouTube
But for gods sake wear proper gloves and goggles, this shit will eat your flesh.
Do it outside on a dry day, mix a saturated solution and pour it into the seat tube (remember to bung up the vent hole at the bottom bracket end).
I have used this method and it works in a spectacular fashion.
Oh and I should just mention that the reaction liberates LOTS of hydrogen, which is explosive.
Toodle pip