METALS AND METAL MATRIX COMPOSITES |
|
|
|
|
|
Microstructures and Properties of Aluminum/Copper Joint Obtained by Arc Welding-brazing with Assistance of Alternating Magnetic Field |
WANG Long, HU De'an, CHEN Yiping, CHENG Donghai, JIANG Shuyuan
|
School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China |
|
|
Abstract Adding longitudinal alternating intermittent magnetic field, using ER5356 aluminum magnesium welding wire as filler metal, the butt welding of T2 copper plate and 2A16 aluminum alloy plate was carried out, by studying the joint forming, interface structure and mechanical properties under different excitation current IE and excitation frequency f, the optimum technological range of the joint is obtained. The results show that the alternative intermittent magnetic field is introduced to realize the effective connection of the dissimilar materials of aluminum and copper. The copper side welding-brazing joint interface layer is composed of IMC layer and transition layer, among them, IMC layer is AlCu and Al2Cu phase, and the transition layer is α-Al+S(Al2CuMg)/Al2Cu phase. IMC layer and transition layer are crisscross, which has the effect of “mechanical occlusion” and improves the joint strength. With the increase of excitation current, the average thickness of IMC layer first decreases and then increases, and the tensile strength first increases and then decreases; with the increase of excitation frequency, the tensile strength decreases gradually. The best process range is: IE=0.5—0.7 A, f=15—25 Hz, the average thickness of IMC layer d=14.3—15.8 μm, the forming perfor-mance of the joint is good, and the tensile strength is high. When IE=0.6 A, f=15 Hz, the highest tensile strength of the joint is 135.47 MPa. The microhardness of interface layer is 252.8HV, which is significantly higher than that of weld and base metal, this may be due to the brittle and hard intermetallic compounds of AlCu and Al2Cu in IMC layer.
|
Published: 01 July 2021
|
|
Fund:National Natural Science Foundation of China (51865034). |
About author:: Donghai Cheng, associate professor, Department of Welding Engineering, Nanchang Aviation University, master's supervisor. From September 2000 to January 2010, he obtained a bachelor's degree in engineering of material forming and control engineering and a doctor's degree in engineering of material processing engineering at Beijing University of Science and Technology. He presided over the National Natural Science Foundation, the Aviation Foundation, the Provincial Department of Education Foundation and several horizontal topics, and published more than 60 academic papers in important journals at home and abroad. Mainly engaged in high-energy beam welding, brazing and other directions of research. Long Wang, Department of Welding Engineering, Nanchang Aviation University, is a postgraduate student. The main research directions are dissimilar metal materials, laser welding, etc. |
|
|
1 Huang J K, Wang Z Y, Liang F F, et al. Electric Welding Machine, 2019,49 (1), 10(in Chinese). 黄健康, 王梓懿, 梁菲菲, 等. 电焊机, 2019, 49(1),10. 2 Wan X L, Wang L, Yao Z W, et al. Rare Metals, 2019, 43 (5), 494(in Chinese). 万秀莲, 王龙, 姚志文, 等. 稀有金属, 2019, 43(5), 494. 3 Mai T A, Spowage A C.Materials Science & Engineering A, 2004,374, 224. 4 Ihor M, Michael S. SPIE, 2006, 6107, 28. 5 Gerd E, Ihor M, Michael S. SPIE, 2004, 5662,337. 6 Abbasi M, Karimi T A, Salehi M T. Journal of Alloys and Compounds,2001, 1,233. 7 Dong H G, Zhang X C, Yang J C, et al. China Mechanical Engineering, 2014, 25(8), 1122(in Chinese). 董红刚, 张旭超, 杨继承, 等. 中国机械工程, 2014, 25(8), 1122. 8 Ji F, Xue S B, Lou J Y,et al. Transactions of Nonferrous Metals Society of China, 2012, 22 (2), 281(in Chinese). 姬峰, 薛松柏, 娄继源,等. Transactions of Nonferrous Metals Society of China,2012, 22(2),281. 9 Yang C, Jiang S Y, Bi H B.Applied Mechanics & Materials, 2014, 532,545. 10 Chen S J, Liu C H, Yu Y,et al. Advanced Materials Research, 2011, 339, 440. 11 Sun Q J, Li J Z, Liu Y B, et al. Journal of Manufacturing Processes, 2018, 32(4),48. 12 Chang Y L, Liu X L, Lu L,et al. International Journal of Advanced Ma-nufacturing Technology, 2014, 70(9),1543. 13 Yin X, Gou J, Zhang J, et al. Journal of Physics D Applied Physics, 2012, 45(28),285203. 14 Guo X M, Yang C G. Journal of Aeronautical Materials, 2007 (2), 18 (in Chinese). 国旭明, 杨成刚. 航空材料学报, 2007(2), 18. 15 Yin X Q, Luo J, Li H G. Journal of Xi'an Jiaotong University, 1999 (7), 73(in Chinese). 殷咸青, 罗键, 李海刚.西安交通大学学报, 1999(7), 73. 16 Chen R, Wang C, Jiang P, et al. Materials & Design, 2016, 109,146. 17 Abralov M A, Abdurakhmanov R U, Iuldashev A T.Automatic Welding, 1977, 30(5),52. 18 Hicken G K, Jackson C E. Welding Journal, 1996, 45(8),513. 19 Lin Q, Li F, Jin P, et al.Journal of Alloys & Compounds, 2017, 734,144. 20 Zhou X L. Research on aluminum/copper dissimilar metal connection process and performance.Master's Thesis, Lanzhou University of Technology, China, 2017(in Chinese). 周相龙. 铝/铜异种金属连接工艺及性能研究. 硕士学位论文, 兰州理工大学, 2017. |
|
|
|