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so you doo need flux for aluminum, when ever i messed around at work trying to weld it it just melts and get a skin (layer oxide) all over it. i was doing it with oxy-Acetylene. but yes i have heard...

i figured i would just show what the difference for those you might not know. and as for what those rods are made of not really sure but i would guess, tin, lead, aluminum, maybe zinc. just all...

yes crazy is right about the brazing. here isa brazed joint.

http://www.outsideconnection.com/gallant/hpv/sprung/1_20_2001/swingarmBrazedToAxle.jpg

and here is a welded joint....

Wozers, thats some neat stuff. i'm gonna have to pick me up some of that and make a massive heatsink or something.

+rep for the find and work.