Flux is used in brazing to clean the metal by dissolving any oxide already present.

When brazing is completed workpiece should be cooled slowly.

Capillary Action in Brazing. Capillarity is defined as movement of a liquid along the surface of a solid caused by the attraction of molecules in the liquid to the molecules of the solid.

Brazing is a process of joining metals by using layer of nonferrous metal between the surface to be joined. The alloy used for brazing is known as spelter (combination of copper and zinc).