I've been teaching myself to braze using an ordinary air propane torch and Cycle Designs System 48, Fillet Pro and White Flux.
As per a request in another thread, this is my student piece, a rack for my wife's bike:
It's made from 9.5 x 0.9 SS304 tube and a combination of home made lugs (System 48) and fillet joints (Fillet Pro). Some of the lugs are internal. The lower mounts were cut from 5 x 20 SS flat bar.
It's too heavy and not as straight as I wanted, mostly due to the poor tube bending. The two sockets on the left were for upcurved tubes to attach to the frame braze-ons. This won't work (it will foul the brakes) so I'm going to have to cut them off and use something else. Not the first such re-jig; I originally made the whole thing 50mm too tall so I had to cut the side supports and re-join them (internally lugged)