Effect of Linear Heat Input on Microstructure and Performance of Joint Conducted by Dual-beam Laser Welding
HAN Shanguo1,2, YANG Yongqiang1, LUO Ziyi2, CAI Detao2, ZHENG Shida2
1 School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510641, China; 2 Guangdong Provincial Key Laboratory of Modern Welding Technology, Guangdong Welding Institute, Guangzhou 510650, China
Abstract: In order to research the connections between linear heat input and dissimlar metals welding of Al/steel, the relationships between linear heat input and welding formation, microstructure, joint performance have been researched according to the process window acquired by optimiza-ting experiments made use of dual-beam laser. The results show that inappropriate linear heat input will result in pothole on weld surface or invalid jointing, while both laser power are few alteration when the welding velocity surpass 0.05 m/s. Linear heat input is directly proportional to penetration, but has no correlation with melting width. The fracture location of linear low heat input joint is at the interface of alumnium and dual-phase steel with shear strength of 130.70 N/mm. While the fracture of high linear heat input joint emerges in alumnium weld with the shear strength of 35.76 N/mm. The microstructure at low linear heat input is consists of lath martensite, and lowest and highest micro-hardness are found in the center of weld and HAZ respectively, but for high linear heat input joint, the microstructure is make up of martensite with coarse columnar crystals and flakes, and the lowest micro-hardness zone of high linear heat input joint is appear in fusion line. The area effectted by main and auxiliary beams occupies two in three of weld area at high linear heat input, which bigger than that area at low linear heat input.
韩善果, 杨永强, 罗子艺, 蔡得涛, 郑世达. 线能量对铝/钢双光束激光焊接接头组织及性能的影响[J]. 材料导报, 2021, 35(2): 2109-2114.
HAN Shanguo, YANG Yongqiang, LUO Ziyi, CAI Detao, ZHENG Shida. Effect of Linear Heat Input on Microstructure and Performance of Joint Conducted by Dual-beam Laser Welding. Materials Reports, 2021, 35(2): 2109-2114.
1 Cai K F. Lightweight multi-objective collaborative optimization design of hubrid-material BIW. Ph.D. Thesis, Jilin University, China, 2018 (in Chinese). 蔡珂芳. 混合材料白车身轻量化多目标协同优化设计. 博士学位论文, 吉林大学, 2018. 2 Li Y B, Ma Y W, Lou M, et al. Journal of Mechanical Engineering, 2016, 52(24), 1(in Chinese). 李永兵, 马运五, 楼铭, 等. 机械工程学报, 2016, 52(24), 1. 3 Indhu R, Divya S, Manish T, et al. Procedia Manufacturing, 2018, 26, 495. 4 Torkamany M J. Ghaini F M, Poursalehi R, et al. Optics and lasers in Engineering, 2016,79, 9. 5 Li C L, Fan D, Yu X Q, et al. Transactions of Nonfeerous Metal Society of China, 2019, 29, 692. 6 Fei Y, Wang X W, Chai F, et al. Optics and Laser Technology, 2019, 113, 164. 7 Qin G L, Lei Z, Su Y H, et al. Journal of Materials Processing Technology, 2014, 214, 2684. 8 Li L Q, Guo W, Tan C W. Chinese Journal of Lasers, 2012, 39(4), 1(in Chinese). 李俐群, 郭伟, 檀财旺.中国激光, 2012, 39(4), 1. 9 Yuan R, Deng S, Cui H C, et al. Journal of Materials Processing Technology, 2019, 40, 37. 10 Pan F, Cui L, Qian W, et al. Acta Matallurgical Sinica, 2016, 52(11), 1388(in Chinese). 潘峰, 崔丽, 钱伟, 等. 金属学报, 2016, 52(11), 1388. 11 Ma G L. Study on welding charactics and molten pool behaviors of dual-spot fiber laser welding. Ph.D. Thesis, Harbin Institute of Technology, China, 2017(in Chinese). 马国龙. 双焦点光纤激光焊接特性及熔池行为研究. 博士学位论文, 哈尔滨工业大学, 2017. 12 Ma G L, Li L Q, Chen Y B. Chinese Journal of Lasers, 2017, 44(3),1(in Chinese). 马国龙, 李俐群, 陈彦宾.中国激光, 2017, 44(3),1. 13 Narsimhachary D, Dutta K, Shariff S M, et al. Journal of Materials Processing Technology, 2019, 263, 21. 14 Li M, Chen S H, Yang L L, et al. Transactions of the China Welding Institution, 2016, 37(12), 21(in Chinese). 李猛, 陈树海, 杨磊磊, 等. 焊接学报, 2016, 37(12), 21. 15 Guan Q Q, Long J Q, Yu P, et al. Optics and Laser Technology, 2019, 111, 387. 16 Liang J W, Qiu X M, Hu Q W, et al. Materials for Mechanical Enginee-ring, 2018, 42(1), 54(in Chinese). 梁静伟, 邱小明, 胡庆伟, 等. 机械工程材料, 2018, 42(1),54. 17 Du H B, Liu C J, Wang W R, et al. Shanghai Metails, 2017, 39(1), 20(in Chinese). 杜汉斌, 刘成杰, 王武荣, 等. 上海金属, 2017, 39(1), 20.
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2021, Vol. 35 
