Effect of laser-arc hybrid welding on fracture and corrosion behaviour of AA6061-T6 alloy

▶ A dendritic cellular structure was formed in the weld fusion zone (WFZ) and caused alloying element segregation. ▶ The precipitation of intermetallic phases and the formation of galvanic corrosion couplings contribute to the improving pitting susceptibility in the WFZ. ▶ The intergranular corrosion nucleates on pit walls and spreads from them.