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AWS - BRH:2007

Brazing handbook 5th edtion

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Organization: AWS
Publication Date: 1 January 2007
Status: inactive
Page Count: 738
ICS Code (Brazing and soldering): 25.160.50
ISBN (print): 978-0-87171-046-8
scope:

The process of brazing that we know today began as an ancient art. Through our increased understanding of the nature and behavior of materials, this art evolved into technology and science. In a very general sense, brazing is a joining process that relies on the melting, flow, and solidification of a brazing filler metal to form a leak-tight seal, a strong structural bond, or both between materials. The process is unique in that this metallurgical bond is formed by melting the brazing filler metal only; the components being joined undergo no melting. Brazing is a well-established commercial process capable of producing strong joints. It is widely used in industry because, in large part, it is capable of joining most metallic and ceramic materials. It is a versatile process that can be performed using manual techniques as well as automated production modes. Brazing lends itself to the production of large assemblies and assemblies composed of dissimilar metals. Brazing produces a tiny, clean fillet in contrast to the irregular bead made by welding, an advantage when appearance is critical. One of the main advantages of brazing is usually associated with cost savings. High production processes adapt well to today's improved processes. Brazing especially adapts to large production quantities as well as single individual quantities. The term brazing refers, in fact, to a group of processes. The American Welding Society (AWS) defines brazing (B) as a group of joining processes that produce the coalescence of materials by heating them to the brazing temperature in the presence of a brazing filler metal that has a liquidus temperature above 840ºF (450ºC) and below the solidus temperature of the base materials. The brazing filler metal is distributed between the closely fitted faying surfaces of the joint by capillary action.1, 2 The term brazing temperature refers to the temperature to which a material is heated to enable the brazing filler metal to spread and adhere to, or wet, the base metal and form a brazed joint.3 This definition serves to distinguish brazing from the other joining processes of soldering and welding. Brazing and soldering share many important features, but the term brazing is used to refer to the joining processes performed above 840ºF (450ºC), while soldering refers to the joining processes performed below this temperature. Brazing differs from welding in that in brazing the intention is to melt the brazing filler metal, not the base materials. In welding, both the brazing filler metals and the base metals are melted to effect the coalescence of materials. Several factors influence the quality of the brazed joint. To achieve a good joint using any of the brazing processes, the components to be joined must be properly cleaned and protected from excessive oxidation by fluxing or the use of a controlled atmosphere. The assembly must be designed so that when the components are properly aligned a capillary is formed, permitting the molten brazing filler metal to flow. It is imperative that the heating process that produces the proper brazing temperature and heat distribution be selected. To provide a basic understanding of brazing, this chapter presents a brief history and an overview of the factors that are fundamental to the brazing processes. To assist the reader with unfamiliar terms, a glossary of common brazing terms is provided in Appendix A of this volume.

abstract:

Updated and expanded. Provides a comprehensive, organized survey of the basics of brazing, processes, and applications. Addresses the fundamentals of brazing, brazement design, brazing filler... View More

Document History

BRH:2007
January 1, 2007
Brazing handbook 5th edtion
The process of brazing that we know today began as an ancient art. Through our increased understanding of the nature and behavior of materials, this art evolved into technology and science. In a very...

References

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