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Article: Successful furnace brazing in Controlled Atmospheres: atmospheres are used in brazing furnaces to create or maintain clean metal surfaces. Aluminum is so reactive, however, that a flux must be used to reduce the oxide first. In this case, an atmosphere would be used to protect the flux from water and oxygen. In fluxless brazing the atmosphere itself acts as the flux.(Nonferrous Melting/Forming/Joining)
- Article from:
- Industrial Heating
- Article date:
- February 1, 2006
- Author:
CopyrightCOPYRIGHT 2006 BNP Media. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Furnace brazing is almost always undertaken in some sort of protective atmosphere, the composition of which depends on the materials to be joined and the alloy used to join them. Although brazing can join materials other than metals, particularly ceramics, this article only considers metal-to-metal joining. A vacuum is also a kind of atmosphere and is widely used, especially for the more reactive metals and for large assemblies made in low volumes. Vacuum processing is a specialized subject and is not discussed here.
Fluxed Brazing
For most metal joining processes, the role of the furnace atmosphere is to create or maintain a clean surface both on the ...
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