Microstructure and fatigue properties of fiber laser welded dissimilar joints between high strength low alloy and dual-phase steels

The aim of this study was to evaluation the microstructure and fatigue properties of welded joints made with fiber laser welding (FLW) on a high strength low alloy (HSLA) and dual-phase (DP980, UTS⩾980MPa) steel in similar and dissimilar material combinations. The fusion zone (FZ) consisted of martensite, and the heat affected zone (HAZ) contained some newly formed martensite and partially tempered martensite on the DP980 steel side. A …