“…Mary and Jahazi reported that higher friction pressure leads to structural degradation, very high temperature at the weld interface and narrow thermo-mechanically affected zone (TMAZ) in case of linear friction welds of IN 718 [15]. Bu et al [16] reported that with increasing friction time, the temperature gradient in the axial direction decreases mainly due to very high energy given in the initial stage and low heat conduction of alloy 718. Kim et al [17] have observed that an aging treatment after friction welding improves hardness and tensile properties of friction welded alloy 718 and SNCrW stainless steel (chemical composition (in wt.…”