Brazing

In brazing, the brazing assembly is heated to a temperature at which the filler rod or solder becomes liquid before flowing and spreading by the wetting action through the space “gap" between the closely adjacent surfaces of the parts to be joined. The interaction by capillarity between the liquid filler metal and the surface of the parent material makes a metallurgical continuity between the parts during the solidification phase of the liquid filler metal.

Unlike welding, the base metal remains in the solid state. In generally, brazing is related to melting points higher than 450°C (900°F) and lower than 450°C for soldering. Therefore, the base metals are less affected by heat and to a lesser degree by oxidation and warping.