Joint performance in laser welding Al alloy with filler wire
(1.State Key Laboratory of Advanced Welding Production Technology,Harbin Institute of Technology, Harbin 150001, China2.黑龙江省哈尔滨市哈尔滨工业大学现代焊接生产技术国家重点实验室)
Abstract: CO2 laser welding aluminum alloy with filler wire was studied. The results indicate that the problems in CO2 laser welding of Al alloy, such as bad appearance of weld, easily excessive penetration and low strength, can be improved effectively by using laser welding with filler wire, and the maximum tensile strength of weld can reach 94% for the base metal. It also can be found that, the linear energy have great influence on the microstructure and mechanical properties of the joint. As the heat input increases, the cellular fir-tree crystals in the weld zone become sparse and the form of tensile fracture transforms from gliding fracture to brittle fracture.
Key words: aluminum alloy； laser welding； filler wire； mechanical property