Investigation of microstructure and mechanical properties of explosively welded ITER-grade 316L(N)/CuCrZr hollow structural member

•Develop a new explosive welding method to fabricate the hollow structural member.•Effects of solution annealing on microstructure of welding interface researched.•Influence of heat treatments on hardness evolution in welding interface studied.•The ultimate strength and elongation were increased after solution annealing.•The interface of samples was exhibited ductile fracture after solution annealing.