Microwave joining of SAF 2507 and optimization of elemental constitution using design of experiments

Abstract

This study focuses on fabrication of SAF2507 similar joints with modified microwave hybrid heating (MHH) method and optimization of the elemental constitution based on energy dispersive spectroscopy (EDS) results. Major input parameters were in this work were filler powder (P), number of graphite rods (R) and process time (T). Each input parameter was varied to three different levels; such as P1, P2 and P3 being no powder, nickel powder and SS304 powder respectively; R1, R2 and R3 being 6, 8 and 10 number of graphite rods respectively; T1, T2 and T3 being 480, 540 and 600 seconds respectively. Experiments were performed as per L9 array based experimental design. EDS based elemental constitution results were used during optimization purpose. Weight percent of Cr, C and Ni have been considered for optimization. Additionally, the mechanical characterization of joints has also been carried out using micro-hardness tests.