Zennzzo, PimpRig's resident phase-change expert, has written up a really quick intro guide to brazing and the process involved. This is the same process he uses to build his custom phase change coolers.
Brazing by definition is also known as hard soldering or silver soldering. Joining metals by fusion of nonferrous (non-iron-containing) alloys that have melting points lower than those of the metals being joined. The filler metal is ordinarily in rod form. It bears some resemblance to welding with two differences: