Brazing

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 partial dissolution of a small amount of base metal in the molten filler metal without melting of the base metal. Sometimes the filler metal is put in place as a thin solid sheet or as a clad layer and the composite is heated as in furnace brazing. The term brazing is used where the temperature exceeds some arbitrary value, such as 425°C (800°F); the term soldering is used for temperatures lower than the arbitrary value.