This article is about the metal-joining process. For the cooking technique, see braising.
Brazing is a metal joining process in which two or more metal articles are joined together by melting and filling metal into the joint, the filler metal having a lower melting point than the adjacent metal.
Brazing differs from soldering in that it does not involve melting the workpiece and welding at a higher temperature for a similar process, but also requires a tighter fit than when soldering. The filler metal flows into the gap between the tight fitting portions by capillary action. The filler metal is made slightly above its melting (liquidus) temperature while being protected by a suitable atmosphere, typically a flux. It then flows through the base metal (called wetting) and then cools to join the workpieces together. The main advantage of brazing is the ability to join the same or different metals with considerable strength.