im no expert on alu welding other than the row of coins thing, but brazing is darn near impossible. I've spent a good amount of time with my mapp torch and alu brazing rod and have only ever achieved one good solid joint. I've been working with thin material most of the time(mainly alu angle from the hardware store) and what usually happens is that i dont get it hot enough and it doesnt bond, or it get waay too hot and begans to melt which means the end joint is annealed and very weak, or sometimes it will just fall to the floor and form a ball of alu. Brazing steel with bronze rod is very easy and very strong i must say though.
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