Microstructural and Mechanical Properties of AZ31B to AA6061 Dissimilar Joints Fabricated by Refill Friction Stir Spot Welding

Dissimilar friction stir spot welds (FSSW) between the magnesium and aluminum alloys are joined, using a novel approach called refill welding. The present work aims to evaluate macrostructural mechanical properties of welded AZ31B AA 6061-T6 in two combinations, i.e., identical Mg-to-Mg dissimilar Mg-to-Al joints, results compared with obtained conventional hardness profiles similar had appearance W-shape, Thermo mechanically affected zone heat-affected both methods lower values than rest weld. Along interface sheets, thin intermetallic compound layer Al12Mg17 has been identified, which led an increase hardness. static shear strength was much greater that traditional welds. In welds, distinct failure scenarios discovered.