摘要
采用双光束光纤激光焊接方法对特殊的十字交叉型接头进行焊接研究,从焊缝成形、力学性能和微观组织方面,系统研究了光斑排布方式和热输入对双光束激光焊接十字交叉型接头焊接特性的影响规律。试验结果表明,采用双光束激光焊接方法可成功实现十字交叉型接头的连接,获得成形良好、力学性能满足要求的接头。在热输入大于120kJ/m时可实现接合面的完全熔合,且串行排布时焊缝成形明显优于并行排布。接头抗拉强度随热输入的增大而增大;在热输入相同条件下,串行排布接头抗拉强度明显大于并行排布,在热输入约为140kJ/m时接头强度达到母材的96.5%。焊缝重熔区显微硬度高于未重熔区,这归因于重熔后焊缝中存在更多的针状δ铁素体。
Study of welding the special cross-type joint is carried out by dual beam fiber laser welding technique. The effects of beam configuration and heat input on the dual beam laser welding characteristics of cross-type joint are systematically studied from weld formation, mechanical property and microstructure. The results show that the cross-type joint can be successfully fabricated by dual beam laser welding method, and the joint with good weld formation and satisfied mechanical property can be obtained. The joining zone is completely fused when the heat input exceeds 120 kJ/m. The weld formation of tandem dual beam laser welding is superior to that of side-by-side dual beam laser welding. The tensile strength of joint increases with the increasing of heat input. With the same heat input, the tensile strength of tandem beam configuration is bigger than that of side-by-side beam configuration. The tensile strength reaches 96.5% of the base metal with heat input about 140 kJ/m. The microhardness of remelting zone is higher than that of non-remelting zone, which is attributed to the reason that more acicular ferrites are generated in weld fusion line after remelting.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2017年第3期61-68,共8页
Chinese Journal of Lasers
关键词
材料
激光加工
十字交叉型接头
双光束
激光焊接
焊接特性
laser technique
laser processing
cross-type joint
dual beam
laser welding
welding characteristic
