brazing


brazing
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. See also welding.

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      process for joining two pieces of metal that involves the application of heat and the addition of a filler metal. This filler metal, 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 capillary action. The temperature of the molten filler used for brazing exceeds 800° F (430° C). In a related process called soldering, the filler metal remains below that temperature. Brazed joints are usually stronger than soldered joints.

      Brazing can be carried out on most metals, and the range of available brazing alloys is increasing as new alloys and new service requirements are introduced. Heating by torch in air is satisfactory, provided the joint is adequately fluxed (flux). Other forms of heating include inductive heating, electrical resistance, molten salts, and baths of molten metal. The wide use of these processes has led to the development of special furnaces and automatic equipment, with special attention being given to accurate control of the temperature and regulation of the atmosphere. Jigs and fixtures are necessary for dip brazing. Preparation of the surfaces by mechanical or chemical cleaning is important for brazing. The extensive use of silver-based brazing alloys melting at temperatures below 1,200° F (650° C) required development of fluxes that are fluid and active at 1,100° F (593° C). Combinations of borates, fluoborates, fluorides, chlorides, borax, and boric acid are commonly used as fluxes. Brazed joints are highly reliable and are used extensively on rockets, jet engines, and aircraft parts. See also welding.

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Universalium. 2010.

Look at other dictionaries:

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  • Brazing — This article is about the metal joining process. For the cooking technique, see braising. Brazing practice Brazing is a metal joining process whereby a filler metal is heated above and distributed between two or more close fitting parts by… …   Wikipedia

  • Brazing — Braze Braze, v. i. [imp. & p. p. {Brazed}; p. pr. & vb. n. {Brazing}.] [F. braser to solder, fr. Icel. brasa to harden by fire. Cf. {Brass}.] 1. To solder with hard solder, esp. with an alloy of copper and zinc; as, to braze the seams of a copper …   The Collaborative International Dictionary of English

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  • brazing — noun A method of joining metals by using heat and a filler …   Wiktionary

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  • brazing — Смотри Пайка …   Энциклопедический словарь по металлургии

  • brazing — a joining process wherein coalescence is produced by heating to suitable temperatures above 800(F and by using a non ferrous filler metal having a melting point below that of the base metals. The filler metal is distributed between the closely… …   Mechanics glossary

  • brazing — n. soldering using a hard solder breɪz v. coat with brass; solder …   English contemporary dictionary


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