Metallurgical and Mechanical Assessment of SS2205/SS304 Joints Fabricated Using Modified Selective Microwave Hybrid Heating-Based Joining.

This study proposes a novel modified joining technique based on selective microwave hybrid heating. Primary objective of this article is to investigate the joining of dissimilar materials, specifically SS2205 and SS304 alloys, with nickel as filler material and graphite rods as susceptors. Following input parameters were used such as power level: 900 W, frequency: 2.45 GHz, number of graphite rods: 16 (each having diameter 2 mm; length 30 mm), ceramic wool: 100 × 50 × 50 mm³, and processing time: 750 s. Mechanical testing of the joints showed an average microhardness of 494.52 HV and ultimate tensile strength of 407.83 MPa with 11.34% elongation. Joint region was analyzed using x-ray diffraction, revealing the presence of various intermetallics and carbides, including FeNi, FeNi₃, CrNi₃, Ni₃C, Fe₃C, and C₂Cr₃. Microstructural examination confirmed a robust metallurgical bond between the two joining surfaces, demonstrating the absence of interfacial cracking. [ABSTRACT FROM AUTHOR]