brazing, method of joining metal parts using nonferrous filler metals with high melting points such as copper, silver, and aluminum alloys. Brazing differs from soldering (see solder) by using a higher temperature; and unlike welding, the parts are not melted. Brazing is best for dissimilar or thinner metal parts and for parts difficult to weld or solder.

Process for joining two pieces of metal by applying heat and adding a filler metal. The filler, which has a lower melting point than the metals to be joined, is either pre-placed or fed into the joint as the parts are heated. In brazing parts with small clearances, the filler is able to flow into the joint by capillarity. The temperature of the molten filler in brazing exceeds 800°F (430°C). In soldering, a related process, the filler metal remains below that temperature. Brazed joints are usually stronger than soldered joints. Most metals can be brazed, and the range of available brazing alloys has increased as new alloys and new service requirements are introduced. Brazed joints are highly reliable and are used extensively on rockets, jet engines, and aircraft parts. Seealso welding.

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