Brazing

Brazing is a metal-joining process. Two or more metal items are joined together by melting and flowing a filler metal into the joint. The filler metal has a lower melting point than the adjoining metal.

Brazing differs from welding because it does not melt the work pieces. Brazing differs from soldering because it uses a higher temperature and more closely fitted parts than soldering. 

During the brazing process, the filler metal flows into the gap between close-fitting parts by capillary action.Groover, Mikell P. 2007. Fundamentals of Modern Manufacturing: materials processes, and systems. (2nd ed) John Wiley & Sons. ISBN 978-81-265-1266-9Schwartz, Mel M. 1987. Brazing. ASM International. ISBN 978-0-87170-246-3 

The filler metal is brought slightly above its melting  temperature. while protected by a suitable atmosphere, usually a flux. It then flows over the base metal and joins the work pieces together. A big advantage of brazing is it can join the same or different metals with considerable strength.

 References 

Category:Metalworking