Optimization of measured mechanical characteristics of selective microwave hybrid heating processed Inconel 625/ SS 304 weldments using multi-objective JAYA algorithm coupled with multi-attributes decision making R-method

Singha, B.Kamble, D.L.Sahu, R.K.Narendranath, S.Badiger, R.I.2026-02-032025Measurement: Journal of the International Measurement Confederation, 2025, 240, , pp. -2632241https://doi.org/10.1016/j.measurement.2024.115553https://idr.nitk.ac.in/handle/123456789/20460This work focuses on the joining of Inconel-625/SS-304 using selective microwave hybrid heating (SMHH) technique. Input power, filler powder particle size, separator, and susceptor size are considered for experimentation according to the Definitive Screening Design. The multi-objectives measured are UTS, FS, and microhardness. XRD results show the intermetallic/secondary phases, and FESEM micrographs show the metallurgical bonding occurs between base metal and filler. The joint and interface region had an average microhardness of 204 ± 10 HV and 342 ± 18 HV, respectively. The UTS and FS of the weldments measured to 550 MPa and 805 MPa. MOJAYA technique is utilized for multi-objective optimization, and R-method determined the optimal process parameters. The optimal process parameters found to 2.2 kW, 25 ?m powder, 120 grit and 0.804 mm separator. The confirmation test reveals UTS ? 566 MPa, FS ? 903 MPa, and microhardness ? 365 HV, which closely matched with predicted observations. © 2024 Elsevier LtdPowder metallurgyPowder metalsSupersaturationCharacterizationInconel 625MOJAYAMulti objectiveOptimal processOptimisationsProcess parametersR-methodSelective microwave hybrid heatingWeldmentsMicrohardnessOptimization of measured mechanical characteristics of selective microwave hybrid heating processed Inconel 625/ SS 304 weldments using multi-objective JAYA algorithm coupled with multi-attributes decision making R-method