Inconel® is a group of nickel-based superalloys, which are featured by superior combination properties. Their good mechanical properties at high temperature, good oxidation and corrosion resistance cause them to become attractive choices for diverse applications in aerospace, marine, chemical, petrochemical and energy industries. Welding of Ni-based superalloys is difficult, because alloying elements such as Nb, Cr, Ti cause harmful precipitations of carbides. Another concern is segregation of Nb and formation of Nb-rich brittle intermetallic Laves phase in the interdendritic regions during weld metal solidifications. In some applications, especially in the aerospace, implementation of innovative design and technology for property, quality and performance are necessary. A favorable solution seems to be multi-material joining. However, problems, associated with the proper selection of materials and welding method, are given rise to. Therefore, any research on the microstructure and properties are justified. In this study, laser beam weldability of these superalloys was evaluated, and the microstructural characteristic and the mechanical properties of their weld joint were investigated. Optical microscopy, scanning electron microscopy and hardness test were utilized for the investigation.Keywords: Inconel 718, Inconel 625, electron beam welding, microstructure, hardness
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