A "faying edge" is the edges of two materials that are to be
joined. This is the surface of a member in contact with another
member to be welded.
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by faying anyway
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Faying surface seals consist of a layer of sealant sandwiched
between two fastened mating surfaces. These seals are used
primarily to prevent corrosion of aircraft structure and to
facilitate leak tracing in the fuel tank.
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seam welding is a process that produces a weld at the faying
surfaces of two similar metals where its used depends on which
metal you look to weld
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H. M. Rahal has written:
'Effects of lack of contact area at faying surfaces on HSFG
bolted connections and their remedial measures'