Joining metals by flowing a thin-layer capillary thickness of nonferrous filler metal into the space between them.
Bonding results from the intimate contact produced by the dissolution of a small amount of base metal in the molten filler metal, without fusion of the base metal. Sometimes, the filler metal is put in place as a thin solid sheet or as cladding and the composite is heated as in furnace brazing.
The term brazing is used where the temperature exceeds some arbitrary value, such as 800F; the term soldering is used for temperatures lower than the arbitrary value.
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use