1 Hubei Key Laboratory of Green Light Industrial Materials, Hubei University of Technology, Wuhan 430068, China 2 School of Mechanical Engineering,Wuhan Polytechnic University,Wuhan 430023,China 3 Wuhan Bojin New Materials Technology Co., Ltd., Wuhan 430058, China
Abstract: The microstructure and mechanical properties of high frequency induction welding joints of 3003 aluminum alloy with wall thickness of 0.28 mm were studied. The results show that the grain size of the welded joint is fine, which is caused by the simultaneous induction heating and extrusion in the welding process, resulting in the plastic deformation of local grains, thereby inhibiting the grain growth. The fusion zone is a narrow waist shape with a width of 6—10 μm, the melting zone with unilateral width of 24—49 μm is thin waist drum-shaped, and the heat affected zone on adjacent sides is partially recrystallized, with width of 115—127 μm. The fracture morphology shows that the fracture type of the welded joint is ductile brittle mixed fracture dominated by ductile fracture. Its tensile strength is 242 MPa, which reaches 91% of the strip, and the elongation is 15%, which is slightly lower than that of the strip (23%). The hardness values of each region of the welded joint were distributed in M-shaped symmetry. The hardness values of the melting zone and the heat affected zone were significantly higher than those of the base metal zone. The hardness value of the melting zone was the highest, reaching 85.27HV, and that of the heat affected zone was about 79.33HV. The hardness value of the fusion zone was the lowest, only 55.85HV. Compared with the base metal, the strength and hardness distribution of welded joints are related to the grain size and the type and distribution of the second phase in each region.
1 Yang S J, Dai S L. Materials Reports, 2005, 19(2), 76(in Chinese). 杨守杰, 戴圣龙. 材料导报, 2005, 19(2), 76. 2 Kawashima T. In: The Fourth International Symposium. Tokyo, 1962, pp.137. 3 Masahito Katsukura. Light Metal Age, 2001, 59(3-4), 70. 4 Krzymień A, Krzymień P. Journal of KONES, 2007, 14(4), 233. 5 Graf A. Materials, design and manufacturing for lightweight vehicles(Second Edition), Pankaj Mallick, ed., Elsevier, Netherlands, 2020, pp.97. 6 Ambriz R R, Mayagoitia V. Recent trends in processing and degradation of aluminium alloys, Ahmad Z, ed., InTech, Croatia, 2010, pp. 63. 7 Hailat M M, Mian A, Chaudhury Z A, et al. Microsystem Technology, 2012, 18(1), 103. 8 Huang Y M, Zhang Z F, Lv N, et al. In: International Conference on Robotic Welding, Intelligence and Automation. Shanghai, China, 2014, pp. 133. 9 Kim S S, Jeong Y J, Park J M, et al. Journal of Mechanical Science and Technology, 2013, 27(10), 2935. 10 Li Y W, Zou W F, Lee B Y, et al. The International Journal of Advanced Manufacturing Technology, 2020, 109(5-6), 1207. 11 Yan P. High frequency induction welding and post-welding heat treatment of steel pipes. Ph. D. Thesis, Cambridge University, UK, 2011. 12 Baake E, Nikanorov A, Ebel W. In: 2019 XXI International Conference Complex Systems: Control and Modeling Problems, Samara, 2019, pp. 199. 13 Zaffaroni G G B, Mishina O V, Ciucania U M, et al. Materials Characterization, 2021, 173, 110939. 14 Ghaffarpour M, Akbari D, Naeini H M. Journal of Materials: Design and Applications, 2021, 235(3), 597. 15 Li Z Q, Liu J P. Journal of Hubei University of Automotive Technology, 2003, 17(3), 21(in Chinese). 李志强, 刘景平. 湖北汽车工业学院学报, 2003, 17(3), 21. 16 He J Y. Study on welding process and quality control technology of the mill used to weld extra thin-walled tube with high-frequency welding. Master’s Thesis, Xi’an Shiyou University, China, 2009(in Chinese). 贺继有. 特薄壁高频焊管机组焊接工艺及质量控制技术研究. 硕士学位论文, 西安石油大学, 2009. 17 郭海霞, 张欣耀, 袁晓冬. 中国专利, CN201811325953. X, 2018. 18 Cao G F, Cao L Z. Welded Pipe and Tube, 2020, 43(4), 61(in Chinese). 曹国富, 曹丽珠. 焊管, 2020, 43(4), 61. 19 Singh R. Pipeline and Gas Journal, 2013, 240(10), 75. 20 Zhao B B, Zhao M M, Jang X L, et al. Aluminium Fabrication, 2020(4), 7(in Chinese). 赵斌斌, 赵茂密, 姜小龙, 等. 铝加工, 2020(4), 7. 21 Liu Y, Cheng Y F. Materials and Corrosion, 2010, 61(3), 211. 22 Tang C L, Wen J Q, Xue X L, et al. Special Casting and Nonferrous Alloys, 2018, 38(6), 596(in Chinese). 唐超兰, 温竟青, 薛喜丽, 等. 特种铸造及有色合金, 2018, 38(6), 596. 23 Li G Q, Zuo X R. Transactions of Materials and Heat Treatment, 2007, 28(3), 63(in Chinese). 李广钦, 左秀荣. 材料热处理学报, 2007, 28(3), 63.