| 激光摆动路径对钢/铝点焊接头组织与性能的影响 |
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| 引用本文： | 巴一,韩善果,杨永强,郑世达,师文庆. 激光摆动路径对钢/铝点焊接头组织与性能的影响[J]. 红外与激光工程, 2022, 51(8): 20210799-1-20210799-10. DOI: 10.3788/IRLA20210799 |
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| 作者姓名： | 巴一 韩善果 杨永强 郑世达 师文庆 |
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| 作者单位： | 1.广东省科学院中乌焊接研究所 广东省现代焊接技术重点实验室，广东 广州 510650 |
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| 基金项目： | 国家重点研发计划（2020 YFE0205300）；国家自然科学基金（62073089）；广东省普通高校重点领域专项（2020 ZDZX2061）；广东省科学院项目(2019 GDASYL-0501011，2018 GDASCX-0803，2020 GDASYL-20200302013) |
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| 摘 要： | 钢、铝两种材料因为物理性能和化学成分上存在较大差异，导致钢铝焊接成为难点。为了得到高质量的钢/铝接头，采用7种激光扫描路径对DP780双相钢和5083铝合金两种金属进行搭接点焊试验。研究激光扫描路径对钢/铝接头宏观形貌、金相组织、显微硬度和剪切强度的影响。结果表明:扫描路径的变化对接头的影响较大，相比于常规焊接，摆动焊接的接头具备更好的连接质量，焊缝表面成形效果更好；钢/铝接头主要由马氏体和铁素体组成，使用激光摆动点焊的接头晶界明显，在马氏体和铁素体交界处有少量的片状珠光体，且焊缝各处的晶粒种类无较大差异，因此焊缝各处力学性能相同，减少受力后，出现应力集中的现象；摆动点焊钢/铝接头的力学性能得到提升，钢侧接头的最大显微硬度可达450 HV，是常规的1.06 倍，剪切强度为83 N/mm，是常规焊接的2.12 倍。
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| 关 键 词： | 激光摆动焊接 焊缝成型 金相组织 显微硬度 剪切强度 |
| 收稿时间： | 2021-10-29 |
Effect of the laser swing path on the microstructure and properties of steel/aluminum spot welded joints |
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| Affiliation: | 1.Guangdong Provincial Key Laboratory of Advanced Welding Technology, China-Ukraine Institute of Welding, Guangdong Academy of Sciences, Guangzhou 510650, China2.School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China3.College of Electronics and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, China |
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| Abstract: | The two materials, steel and aluminum, are difficult to weld because of the large differences in physical properties and chemical composition, resulting in steel and aluminum welding becoming difficult. To obtain high-quality steel/aluminum joints, seven laser scanning paths were used to perform lap joint spot welding experiments on two metals, DP780 duplex steel and 5083 aluminum alloy. The effects of the laser scanning path on the macroscopic morphology, metallographic organization, microhardness and shear strength of the steel/aluminum joint were studied. The results show that the change in scanning path has a greater impact on the joint compared to conventional welding. Swing welding joints have better joint quality and better weld surface formation. Steel/aluminum joints are mainly composed of martensite and ferrite. The use of laser swing spot welding joints with obvious grain boundaries, a small amount of lamellar pearlite at the junction of martensite and ferrite, and there is no significant difference in the grain types of the weld, so the mechanical properties of all parts of the weld are the same, reducing the stress concentration phenomenon after the force is applied. The mechanical properties of the swing spot welded steel/aluminum joint are enhanced, the maximum microhardness of the steel side joint can reach 450 HV, 1.06 times that of conventional, and the shear strength is 83 N/mm, 2.12 times that of conventional welding. |
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