Why Choose Brazing?
Brazing is a joining process taking place above 840°F (450°C) in which the materials to be joined are commonly heated about 100°F (55.6°C) above the temperature at which the brazing filler metal (BFM) being used has turned liquid, so that the liquid BFM will cover all of the mating surfaces, and then alloy with and form a permanent bond between those surfaces. The BFM may be applied outside the mating surfaces, in which case, the liquid BFM will need to be drawn between the mating surfaces by capillary action. In other cases, the BFM may be formed in place by the metallurgical reaction (diffusion) between the base metals being joined and a plated metal on either or both of their mating surfaces. (For an official definition of the process, see the Brazing Handbook# [Ref. 1]). FIG 1 – The casting shown at top needs to be faced, drilled and tapped in three placesw. Its is much easier to braze three threaded couplings/tubes into a machined block (bottom) Brazing is, however, only one of se
