Use a MAPP gas torch. It's just like a propane torch, but much hotter.
They're available in just about every hardware store.

It's sold specifically for applications like you describe. I use mine
to both silver solder and do light brazing. (I also own an
oxy/acetylene outfit, but it's kind of an overkill for small jobs.)

http://www.corpbrothers.com/productcgc/mapp.htm

Harry C.