摘要
采用光纤激光器对1.4 mm厚的DC56D+ZF镀锌钢和1.2 mm厚的6016铝合金平板试件进行了加入胶层的激光搭接焊试验,分析了焊接接头的微观组织、断口形貌和力学性能,研究了不同工艺参数对钢/铝胶接正面与横截面焊缝形貌的影响.结果表明,在激光功率为1 650 W,焊接速度35 mm/s,离焦量+3.0 mm,氩气为保护气体且流量为20 L/min的最佳工艺条件下,加入胶层,焊接试样正面焊缝均匀连续,无气孔、裂纹缺陷,钢/铝连接良好;焊接接头抗剪强度与平均剪切力分别为41.45 MPa和1.04kN,力学性能并没有因为胶层的加入而减弱,焊缝区断裂形貌为韧性断裂与准解理断裂的混合形貌.
Fiber laser was adopted with adhesive layer to join 1.4 mm thick DC56D+ZF galvanized steel and 1.2 mm thick 6016 aluminum alloy sheets. The microstructure, fracture appearance and mechanical properties of the joint were investigated. The influences of welding parameters on the weld appearance were analyzed. The results show that with the addition of adhesive layer, no pores or cracking were observed on the welds. The average shearing strength and shearing load of the steel/aluminum joint were 41 MPa and 1.04 kN. The failure mode of welded joint presented a mixture of ductile and quasi-cleavage fractures.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2013年第4期11-14,113,共4页
Transactions of The China Welding Institution
基金
国家高技术研究发展计划(863)重点资助项目(2007-AA042006)
湖南大学汽车车身国家重点实验室自主课题(71075003)资助项目
关键词
钢
铝异种金属
激光焊
胶层
焊缝形貌
laser-adhesive hybrid welding
steel
aluminum
weld appearance
tensile strength
