Transactions of The China Welding Institution >

2022 , Vol. 43 >Issue 5: 14 - 20

DOI: https://doi.org/10.12073/j.hjxb.20210825004

Effects of surface layer microstructure on liquation crack and fatigue properties of 6005A aluminum alloy MIG joints

  • HAN Xiaohui ,
  • LI Shuaizhen ,
  • WU Laijun ,
  • TAN Caiwang ,
  • LI Gangqing ,
  • SONG Xiaoguo
Expand
  • 1. CRCC Qingdao Sifang Co., Ltd., Qingdao, 266111, China;
    2. State Key Laboratory of Advanced Welding and Joining, Harbin, 150001, China;
    3. Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai, 264209, China

Received date: 2021-08-25

  Online published: 2022-07-14

Fold

Abstract

The effects of surface microstructure on liquation cracks and fatigue properties of 6005A aluminum alloy MIG joints used in high-speed train bodies were comparatively studied. The results showed that the second phase near the grain boundary of the coarse-grained microstructure was coarse, resulting in larger thickness of the grain boundary liquid film in the heat-affected zone reaching 8~10 μm, which made the liquefied grain boundary less resistant to tensile stress and more sensitive to liquation cracks. The liquation cracks formed by the surface coarse-grained microstructure become possible crack sources during the fatigue process, which adversely affect the fatigue properties of the joints. Improving the surface microstructure of the base metal could suppress the formation of liquation cracks and improve the fatigue performance of the joint. The fatigue strength of the surface coarse-grained joint was 93 MPa under 1 ×107 cycles, while that of the surface fine-grained joint was 107 MPa.

Key words： 6005A aluminum alloy; coarse grained microstructure; MIG joints; liquation crack; fatigue properties

Cite this article

HAN Xiaohui , LI Shuaizhen , WU Laijun , TAN Caiwang , LI Gangqing , SONG Xiaoguo . Effects of surface layer microstructure on liquation crack and fatigue properties of 6005A aluminum alloy MIG joints[J]. Transactions of The China Welding Institution, 2022 , 43(5) : 14 -20 . DOI: 10.12073/j.hjxb.20210825004

References

[1] 董晓晶, 李桓, 杨立军, 等. 铝合金多股复合脉冲MIG焊接接头组织及性能分析[J]. 焊接学报, 2019, 40(11): 61 ? 67
Dong Xiaojing, Li Huan, Yang Lijun, et al. Microstructure and mechanical properties of pulse MIG aluminum alloy welded joints by means of a novel multi-strands composite welding wire[J]. Transactions of the China Welding Institution, 2019, 40(11): 61 ? 67
[2] Wang Y, Wei B, Guo Y, et al. Microstructure and mechanical properties of the joint of 6061 aluminum alloy by plasma-MIG hybrid welding[J]. China Welding, 2017, 26(2): 58 ? 64.
[3] Qi Guangbin, Dong Honggang, Yang Jiang, et al. Texture and mechanical properties of metal inert gas welded 6082-T651 aluminum alloy joints[J]. China Welding, 2021, 30(1): 1 ? 12.
[4] 邵盈恺, 王玉玺, 杨志斌, 等. 基于熔深优化的7075铝合金等离子-MIG复合焊接热裂纹敏感性[J]. 金属学报, 2018, 54(4): 547 ? 556
Shao Yingkai, Wang Yuxi, Yang Zhibin, et al. Plasma-MIG hybrid welding hot cracking susceptibility of 7075 aluminum alloy based on optimum of weld penetration[J]. Acta Metallurgiga Sinica, 2018, 54(4): 547 ? 556
[5] Huang C, Kou S. Liquation cracking in partial-penetration aluminum welds: Effect of penetration oscillation and backfilling[J]. Welding Journal, 2003, 82(6): 184 ? 194.
[6] 王俊, 李芳, 张跃龙, 等. 焊丝中Si元素含量对铝合金接头裂纹敏感性的影响规律及机理[J]. 焊接学报, 2020, 41(1): 55 ? 60
Wang Jun, Li Fang, Zhang Yuelong, et al. Effect of Si content in welding wire on crack sensitivity of aluminum alloy and its mechanism[J]. Transactions of the China Welding Institution, 2020, 41(1): 55 ? 60
[7] 俞照辉, 严红革, 严军辉, 等. 热影响区连续孔隙状裂纹的表征及产生机理[J]. 焊接学报, 2019, 40(5): 84 ? 88
Yu Zhaohui, Yan Hongge, Yan Junhui, et al. Characterization and formation mechanisms of continuous porosities-llike cracks in the heat-affected zone[J]. Transactions of the China Welding Institution, 2019, 40(5): 84 ? 88
[8] Dong P, Li H M, Sun D Q, et al. Effects of welding speed on the microstructure and hardness in friction stir welding joints of 6005A-T6 aluminum alloy[J]. Marerials & Design, 2013, 45: 524 ? 531.
[9] Ji S D, Meng X C, Liu J G, et al. Formation and mechanical properties of stationary shoulder friction stir welded 6005A-T6 aluminum alloy[J]. Marerials & Design, 2014, 62: 113 ? 117.
[10] 张健, 雷振, 王旭友. 高速列车6005A铝合金型材焊接热裂纹分析[J]. 焊接学报, 2012, 33(8): 60 ? 64
Zhang Jian, Lei Zhen, Wang Xuyou. Welded hot crack analysis of 6005A aluminum[J]. Transactions of the China Welding Institution, 2012, 33(8): 60 ? 64
[11] 刘敬萱, 沈健, 李锡武, 等. 6005A-T6铝合金搅拌摩擦焊接头组织与疲劳性能[J]. 材料导报, 2021, 35(2): 2092 ? 2097
Liu Jingxuan, Shen Jian, Li Xiwu, et al. Microstructure and fatigue properties of friction stir welded 6005A-T5 aluminum alloy[J]. Materials Reports, 2021, 35(2): 2092 ? 2097
[12] Liu Haobo, Yang Shanglei, Xie Charjie, et al. Mechanisms of fatigue crack initiation and propagation in 6005A CMT welded joint[J]. Journal of alloys and Compounds, 2018, 741: 188 ? 196.
[13] Birol Yucel. Impact of partial recrystallization on the performance of 6005A tube extrusions[J]. Engineering Failure Analysis, 2010, 17(5): 1110 ? 1116.
[14] 申澎洋, 唐建国, 叶凌英, 等. 组织不均匀性对6005A铝合金晶间腐蚀性能的影响[J]. 材料研究学报, 2018, 32(10): 751 ? 758
Shen Pengyang, Tang Jianguo, Ye Lingying, et al. Effects of microstructure heterogeneity on intergranular corrosion susceptibility of Al-alloy 6005A[J]. Chinese Journal of Materials Research, 2018, 32(10): 751 ? 758
[15] 张大鹏, 王顺成, 周楠, 等. 粗晶环对无铅2011铝合金挤压棒材力学与切削性能的影响[J]. 强合金加工技术, 2020, 48(7): 24 ? 27
Zhang Dapeng, Wang Shuncheng, Zhou Nan, et al. Effects of coarse-grained on mechanical properties and cutting performance of lead-free 2011 aluminum alloy extruded bar[J]. Light Alloy Fabrication Technology, 2020, 48(7): 24 ? 27
[16] 刘聪, 袁定旺, 杨修波, 等. 组织不均匀性对铝合金焊接区裂纹的影响[J]. 电子显微学报, 2015, 34(3): 181 ? 188
Liu Cong, Yuan Dingwang, Yang Xiubo, et al. Effects of microstructure heterogeneity on crack behaviors in the welding zones of aluminum alloys parts[J]. Journal of Chinese Electron Microscopy Society, 2015, 34(3): 181 ? 188
[17] 李学朝. 铝合金材料组织与金相图谱[M]. 北京: 冶金工业出版社, 2019.
Li Xuechao. Microstructure and metallographic spectrum of aluminum alloy materials [M]. Beijing: Metallurgical Industry Press, 2019.
[18] Huang C, Kou S. Partially melted zone in aluminum welds-liquation mechanism and directional solidification[J]. Welding Journal, 2000, 79(5): 113 ? 120.
[19] 李乐, 路媛媛, 唐峰, 等. 表面纳米化对镍基高温合金焊接液化裂纹的影响[J]. 焊接学报, 2019, 40(1): 151 ? 155
Li Le, Lu Yuanyuan, Tang Feng, et al. Effect of surface nanocrystallization on welding liquation cracking of nickel-base superalloy[J]. Transactions of the China Welding Institution, 2019, 40(1): 151 ? 155
Options
Outlines

/

〈 〉

　 Copyright © Transactions of The China Welding Institution, All Rights Reserved.
Powered by Beijing Magtech Co. Ltd,.