Abstract
It is well known that nickel-based superalloys are suitable for the high-temperature applications, like turbine blades and discs in aircraft engines and power generation plants. Due to the high cost of manufacturing and repairing with difficulty using conventional mechanical processing, the joining of superalloys has been of a major concern to the aerospace and nuclear industries. Fusion welding is one of the desirable methods and has been investigated with a major problem of the formation of hot cracks, while as other solid state welding technologies, like diffusion bonding or brazing, normally require long bonding times with extra heat treatments. Present work studies the tensile shear strength of welded specimens of Inconel® alloy 718 with electron beam welding, laser beam welding, diffusion bonding and hot isostatic pressing. The purpose was to determine the optimum welding method for overlap bonding of Inconel® alloy 718 for superplastic blow forming.
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