Brazing is a metal-joining process that uses a filler metal with a melting point below that of the base metals. The filler metal melts and flows into the joint by capillary action, creating a strong bond between the two pieces of metal. Unlike welding, brazing does not melt the base metals.

The process of brazing begins with cleaning the base metals to remove any dirt, grease, or other contaminants. A flux is then applied to the joint to prevent oxidation and promote wetting of the filler metal. The filler metal is then heated until it melts and flows into the joint. The joint is then cooled and the flux is removed.

Brazing is a versatile process that can be used to join a variety of metals, including steel, copper, brass, and aluminum. It is often used in the manufacture of plumbing, electrical, and automotive components.