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Diffusion brazing (DFB) is a process that coalesces, or joins, metals by heating them to a suitable brazing temperature at which either a preplaced filler metal will melt and flow by capillary attraction or a liquid phase will form in situ between one faying surface and another. This article discusses the two critical aspects of DFB, namely, a liquid filler metal must be formed and become active in the joint area and extensive diffusion of filler metal elements into the base metal must occur. It schematically illustrates a diffusion process that results in the loss of identity of original...

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