Abstract
In this study, Inconel 718 and AISI 316L were joined by continuous drive friction welding (CDFW) with 27 different welding parameter combinations. After welding the specimens with these 27 parameters, microstructural analyses were first carried out using an Optical Microscope (OM), a Scanning Electron Microscope (SEM), and Energy-Dispersive Spectrometry (EDS). Later, mechanical property investigations included hardness and tensile tests. Moreover, hardness distributions were analyzed from the cross-section of the welded specimens. Besides, the maximum tensile strength was obtained as 736.3 MPa, and the minimum tensile strength was obtained as 653.6 MPa in all cases. Consequently, friction welding of these dissimilar materials without any heat treatment was found to be applicable. It was also concluded that the most appropriate welding parameters among the 27 welding parameter combinations were 1600 rpm, 6 s friction time, and 40 MPa friction pressure.

Key words
continuous drive friction welding, dissimilar materials, hardness, superalloy, Inconel 718, AISI 316L

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