Protective Atmosphere Brazing

In the brazing process, a joint between two metals is made by placing a lower melting point metal (filler metal) in the joint, then heating the assembly to a temperature where the filler metal can melt and flow. The filler metal is drawn into the area to be joined and forms a solid bond between the two primary metals. The bond is often as strong as the metal itself. 

Brazing is carried out in a furnace using an atmosphere which protects the metals being joined and the filler metal from being oxidized at the high temperatures used. The process has the advantage over welding in that an entire assembly, including interior passages, can be made in one step, with little or no finishing required. Most metals and alloys, for example aluminum, steel, copper, and stainless steels can be joined using furnace brazing in a protective atmosphere, by the proper selection of temperature and atmosphere conditions.

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