AWS - Chapter 12 - Brazing
| Organization: | AWS |
| Publication Date: | 1 January 2004 |
| Page Count: | 56 |
scope:
The term brazing refers to a group of joining processes that includes torch brazing, furnace brazing, induction brazing, dip brazing, diffusion brazing, resistance brazing, and infrared brazing. Brazed joints are formed when an assembly of materials is heated to the brazing temperature in the presence of a filler metal with a liquidus above 450°C (840°F) but below the solidus, or melting point, of the base materials. The filler metal distributes itself between the closely fitted surfaces of the joint by capillary action.1, 2 Heat is provided by a system appropriate to the process and application. Brazing is economically attractive for the production of high-strength metallurgical bonds while preserving desired base material properties. The various brazing processes discussed in this chapter serve many industrial and commercial joining needs. Examples of brazing applications throughout the chapter illustrate when to select brazing as the joining process, how to design the joint, and what materials are best suited for an individual application. Some of the techniques, equipment, and physical mechanisms of both brazing and welding are integrated in a process known as braze welding. Although classified as a stand-alone welding process by the American Welding Society, braze welding is discussed in this chapter because of these close relationships. The brazing processes discussed in this chapter include torch brazing, furnace brazing, induction brazing, resistance brazing, dip brazing, infrared brazing, and diffusion brazing. Several seldom-used brazing processes-blanket brazing, block brazing, exothermic brazing, and twin carbon arc brazing-are addressed briefly. Other topics included in this chapter are brazing equipment and materials, techniques, braze quality, inspection, economics, and safe practices.
abstract:
Brazing
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