Chapter 12 from the Welding Handbook, Ninth Edition, Volume 3, “Welding Processes, Part 2,” has been selected by the AWS Product Development Committee as a service to industry professionals. Diffusion brazing is distinguished from diffusion welding by the fact that liquid braze filler metal is introduced at the joint interface. When liquid filler metal is used, only moderate-to-low pressures are necessary versus the high pressures used for diffusion welding. The similarities and common features of diffusion welding and diffusion brazing are discussed in general in the first sections of this chapter. Information specific to each process is presented in separate welding and brazing sections. Both processes are discussed in the sections on Quality and Inspection, Economics, and Safe Practices. A brief section on a related process, diffusion soldering, also is included.
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