焊接速度对钢/铝异种金属激光深熔焊接头特性的影响  

Effects of Welding Speed on Characteristics of Dissimilar Steel/Al Joints Produced by Laser Keyhole Welding

作　　者：崔丽[1] 钱伟[1] 潘峰[1] 贺定勇[1] 王智慧[1] CUI Li;QIAN Wei;PAN Feng;HE Dingyong;WANG Zhihui(College of Materials Science and Engineering,Beijing University of Technology-,Beijing 100124,China)

机构地区：[1]北京工业大学材料科学与工程学院,北京100124

出　　处：《北京工业大学学报》2018年第10期1347-1352,共6页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(51475006);北京市教育委员会科技计划重点项目暨北京市自然科学基金B类资助项目(KZ201610005004)

摘　　要：为了解决钢/铝异种金属焊接接头力学性能较低的难题,采用无任何填充材料的光纤激光深熔焊接方法,研究了不同焊接速度对钢/铝搭接接头焊缝成形、界面组织和力学性能的影响.研究结果表明,随着焊接速度从2.4 m/min增加到3.3 m/min,钢/铝接头焊缝成形不断改善,且在焊接速度为3.0、3.3 m/min时,获得良好的焊缝成形.钢/铝接头界面金属间化合物层由Fe_2Al_5和Fe_4Al_(13)相组成,且增加焊接速度明显减小Fe_4Al_(13)相的数量及界面Fe_2Al_5层的厚度.接头拉伸剪切试验结果表明,当焊接速度为3.0 m/min时,钢/铝搭接接头的机械抗力值最高达137.1 N/mm.To improve the low mechanical properties of the welded steel/A1 dissimilar joints, eft）cts of dirt）rent welding speeds on the weld shape, interface microstructures and mechanical properties of the steel/A1 lapped joints were studied by using fiber laser keyhole welding process without any filler materials. Results show that the weld appearance of the joints is improved with increasing welding speed from 2.4 m/min to 3.3 m/min. A smooth weld can be achieved under the condition of welding speed of 3.0 m/min and 3.3 m/min. Intermetallic compound layers composed of Fe2A1s and Fe4A113 phases are fomled at the interface of the steel/A1 joints. The quantity of Fe4Al13 phases and the thickness of the Fe2A1s layers at the interface decrease with the increase of the welding speeds. The tensile shear tests show that the highest mechanical resistance of 137.1 N/mm can be obtained for the steel/A1 joints at a welding speed of 3.0 m/min.

关 键 词：钢/铝异种接头 激光深熔焊 金属间化合物 力学性能 

分 类 号：TG456[金属学及工艺—焊接]