Tensile and fatigue behavior of novel dissimilar resistance spot welds of AA5754 to steels: interplay of intermetallic layer, weld nugget diameter and notch root angle

AA5754 sheet was resistance spot welded (RSW) to high-strength low-alloy (HSLA) steel sheet and low carbon steel (LCS) sheet respectively using multi-ring domed (MRD) electrodes and multiple solidification weld schedules. The confluence of the intermetallic compound layer, weld nugget diameter, and notch root angle are delineated. The results demonstrated that elevated Mn content (0.634%) in the HSLA steel promoted the formation of a thinner …