Brazing represents a group of welding processes which produce coalescence of materials by heating them in the presence of a filler metal having a liquidus above 840 °F (450°C) and below the solidus of the base metal. The filler metal is distributed between the closely fitted faying surfaces of the joint by capillary action. Brazing is used in practically every industry, from jewelry to aerospace. Applications include leaktight joints, tubing joints, engine nozzles; joining electrical wire, cables and bus bars; and producing tanks, vats and piping.

Vacuum Brazing (brazing in vacuum atmosphere) is commonly used for certain materials that readily form oxide layers in air or partial pressure. Titanium based, active metal brazing (ABA) is performed in vacuum and is well suited for bonding metal and non-metal materials without the added time and expense of metalizing or thin-film sputtering. Vacuum brazing is also commonly used for Stainless Steel-type alloys which are ideally suited for bonding Stainless Steel for Medical, Semiconductor equipment and industrial vacuum applications.