Electron Beam Welding of Nickel Base Alloy 718

Abstract

As with inventions and evolutions of other manufacturing processes, requirements and developments of our present atomic and space-age worked together to accomplish continuing gains in welding technology, i.e. stronger welds with less heat affected zone by evolving exotic new metal joining processes like laser, diffusion and electron beam welding (EBW).

A detailed study of EBW process was made with its inherent advantages/attributes in making use of this process and its limitations in welding of Inconel 718. Optimum welding parameters were established making use of high vacuum mode of EBW’s application for welding of Inconel-718. Welds so made were subjected to quality checks i.e. Radiographic Examination of Welds, Joint Efficiencies, Residual Stresses, Metallographic Examination of Welds & the Effect of Post Weld Heat Treatment (PWHT) on mechanical properties to qualitatively demonstrate capabilities of EBW.