工艺参数对铝-钢激光熔钎焊接头质量的影响  

Effect of Process Parameters on Quality of Aluminum/Steel Laser Brazing Joint

作　　者：李兆艳 龙芋宏 赵要武 单晨 Li Zhaoyan;Long Yuhong;Zhao Yaowu;Shan Chen(Guangri Key Laboratory of Manufacturing Systems and Aduanced Manufacturing Technology,Schoolof Mechanical&Electrical Engineering Guilin Universityof Electronic Technology,Guilin,Guangxi541004,China)

机构地区：[1]桂林电子科技大学机电工程学院,广西制造系统与先进制造技术重点实验室,广西桂林541004

出　　处：《应用激光》2022年第4期14-20,共7页Applied Laser

基　　金：国家自然科学基金青年科学基金资助项目(62004050);广西自然科学基金重点项目(2019JJD160010);广西研究生教育创新项目(JGY2018061,JGY2019074)。

摘　　要：为探索低功率激光焊接钢铝熔钎焊的可行性,采用光纤激光器以1 mm厚的6061铝合金和1.2 mm厚的DP600双相钢为试验对象,进行铝在上、钢在下的激光熔钎焊试验。研究了焊接速度和激光功率对焊接接头质量(焊缝成形性、微观组织和力学性能)的影响。结果表明:接头抗拉剪强度随着激光功率的增加和焊接速度的加快,均表现为先增大后减小,并在激光功率为405 W,焊接速度为5 mm/s的工艺参数下,焊接接头的抗拉剪强度达到最大值127 N/mm,金属间化合物厚度约为10μm,断口为典型的解理断裂。该研究为提高激光焊接质量提供了一定的技术支持。In order to explore the feasibility of low-power laser welding of steel and aluminum, a fiber laser was used to conduct laser brazing experiments of aluminum on the top and steel on the bottom with 1 mm thick 6061 aluminum alloy and 1.2 mm thick DP600 dual-phase steel as the test objects. The effects of laser power and welding speed on weld quality(joint formability, weld microstructure and mechanical properties) were investigated. Results show that the tensile strength of the joints first increases and then decreases with the increase of laser power and welding speed. The maximum tensile strength of the welded joint is 127 N/mm, the fracture shows typical brittle fracture characteristics, and the thickness of intermetallic compound is about 10 μm, under the laser parameter with power of 405 W, welding speed of 5 mm/s. The study provides certain technical support for improving the quality of laser welding. The effects of laser power and welding speed on joint formability, weld microstructure and mechanical properties esults show that the tensile strength of the joints first increases and then decreases with the increase of laser power and welding speed.

关 键 词：激光熔钎焊 工艺参数 金属间化合物 微观形貌 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接]