Effect of Layer Arrangement on Microstructure and Mechanical Properties of 6005A Aluminum Alloy MIG Joints
LI Shuaizhen1, HAN Xiaohui1, WU Laijun2,3,*, LIU Yuhang3, WANG Peng1, SONG Xiaoguo2,3, TAN Caiwang2,3
1 CRCC Qingdao Sifang Co., Ltd., Qingdao 266111, Shandong, China 2 State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China 3 Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, Shandong, China
Abstract: The effects of metal inert gas(MIG) welding layer and pass arrangements on the microstructure and mechanical properties of 6005A aluminum alloy joints were studied. High-quality butt joints were obtained with different welding layer arrangements, including two layer-two pass, two layer-three pass and three layer-three pass. The peak temperature of heat-affected zones (HAZ) was compared by welding thermal cycles, and the microstructure transformation in the heat-affected zones was studied by electron backscattering diffraction (EBSD) and transmission electron microscopy (TEM). Moreover, the microhardness and tensile strength of welded joints were examined. The results indicate that the softening zone located in the HAZ is the weakest part of the 6005A aluminum alloy multi-layer and multi-pass MIG joint. Different microstructures and mechanical properties were obtained in the HAZ with different welding layer arrangements, through different welding thermal cycles. The rolled characteristic of grains was observed in incomplete recrystallization HAZ of the three-layer and three-pass welded joint, while equiaxed grains were obtained in the complete recrystallization HAZ of the two-layer and two-pass welded joint, and the recrystallization extent of grains in the HAZ of the two layer-three pass welded joint was between those of the three layer-three pass and two layer-two pass welded joints. Besides, the overaging of the HAZ strengthening phase β″ leads to joint softening. Among the three types of welding layer arrangements, the three-layer and three-pass welding joints has the lowest energy input and the shortest high-temperature residence time, resulting in the lowest degree of HAZ overaging as well as the lowest strength and hardness. In this case, the average tensile strength of three-layer and three-pass welding joints is 211 MPa, which is higher than that (183 MPa) of two-layer and two-pass welding joints and that (161 MPa) of two-layer and three-pass welding joints obviously.
李帅贞, 韩晓辉, 吴来军, 刘裕航, 王鹏, 宋晓国, 檀财旺. 层道排布对6005A铝合金MIG焊接头微观组织及力学性能的影响[J]. 材料导报, 2022, 36(17): 21060094-5.
LI Shuaizhen, HAN Xiaohui, WU Laijun, LIU Yuhang, WANG Peng, SONG Xiaoguo, TAN Caiwang. Effect of Layer Arrangement on Microstructure and Mechanical Properties of 6005A Aluminum Alloy MIG Joints. Materials Reports, 2022, 36(17): 21060094-5.
1 Hadadzadeh A, Ghaznavi M M, Kokabi A H. The International Journal of Advanced Manufacturing Technology, 2017, 92(5-8), 2255. 2 Yan S H, Xing B B, Zhou H Y, et al. Materials Characterization, 2018, 144, 205. 3 Ren Z W, Luo B H, Zheng Y Y, et al. Materials Reports A: Review Papers, 2019, 33(9), 3072(in Chinese). 任智炜, 罗兵辉, 郑亚亚, 等. 材料导报:综述篇, 2019, 33(9), 3072. 4 Ji H, Deng Y L, Deng J F, et al. Transactions of the China Welding Institution, 2019, 40(5), 24(in Chinese). 吉华, 邓运来, 邓健峰, 等. 焊接学报, 2019, 40(5), 24. 5 Dong P,Li H M, Sun D Q, et al. Marerials & Design, 2013, 45, 524. 6 Cornacchia G, Cecchel S, Panvini A. The International Journal of Advanced Manufacturing Technology, 2018, 94(5-8), 2017. 7 Zhang J, Lei Z, Wang X Y. Transactions of the China Welding Institution, 2012, 33(8), 60(in Chinese). 张健, 雷振, 王旭友.焊接学报, 2012, 33(8), 60. 8 Jin X, Kang M, Xu Y J, et al. Nonferrous Metal Processing, 2021, 50(2), 23(in Chinese). 金鑫, 康铭, 徐玉君, 等. 有色金属加工, 2021, 50(2), 23. 9 Liu H B, Yang S L, Xie C, et al. Journal of Alloys and Compounds, 2018, 741, 188. 10 Gao Q W, Shu F Y, Peng H E, et al. Transactions of Nonferrous Merals Society of China, 2019, 29, 2496. 11 Lu H. Transactions of the China Welding Institution, 2015, 36(4), 75(in Chinese). 路浩. 焊接学报, 2015, 36(4), 75. 12 Yao Wei, Wang Zhimin, Li Hongwei, et al. Transactions of the China Welding Institution, 2011, 32(7), 21(in Chinese). 姚为, 王志敏, 李宏伟, 等. 焊接学报, 2011, 32(7), 21. 13 Yang W C, Wang M P, Sheng X F, et al. Acta Metallurgiga Sinica, 2010, 46(12), 1481(in Chinese). 杨文超, 汪明朴, 盛晓菲, 等. 金属学报, 2010, 46(12), 1481. 14 Lyu X C, Lei Z, Zhang J, et al. Transactions of the China Welding Institution, 2014, 35(8), 25(in Chinese). 吕晓春, 雷振, 张健, 等. 焊接学报, 2014, 35(8), 25. 15 Liu J X, Shen J, Li X W, et al.Materials Reports, 2021, 35(2), 2092(in Chinese). 刘敬萱, 沈健, 李锡武, 等. 材料导报, 2021, 35(2), 2092.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2022, Vol. 36 
