In order to study the effects of welding speed, stirring head rotation speed and pressure deep of shaft shoulder on tensile strength of 7A52 aluminum alloy friction stir welding. 20 groups of tests were designed by response surface methodology based on central composite test design, and response function relationship were established. In order to verify the accuracy of the response function relationship, variance analysis and regression analysis were used to determine the dominance of the regression model, and the deviation of correlation coefficient R2 was only 3.17%. The accuracy of the model was verified by analyzing the influence of single welding parameter and double welding parameter on tensile strength. Finally, the model was verified by tensile test. The results show that the joint tensile strength can be predicated based on response function relationship of response surface methodology fitting, and the best combination of welding parameter (welding speed 110 mm/min，stirring head rotation speed 1 436 r/min，pressure deep of shaft shoulder 0.55 mm) was gained. The maximum predication tensile strength was 380 MPa.
FAN Wenxue
,
CHEN Furong
. Prediction and optimization of tensile strength of 7A52 aluminum alloy friction stir welding joints based on response surface methodology[J]. Transactions of The China Welding Institution, 2021
, 42(9)
: 55
-60
.
DOI: 10.12073/j.hjxb.20210322001
[1] 陈芙蓉, 贾翠玲. 7A52铝合金焊接及其接头表面纳米化研究现状[J]. 华东交通大学学报, 2019, 36(1): 1 ? 11
Chen Furong, Jia Cuiling. Review on 7A52 aluminum alloy welding and its welded joint surface nanocrystallization[J]. Journal of East China Jiaotong University, 2019, 36(1): 1 ? 11
[2] Jia Y, Qin Y, Ou Y, Wang K, et al. The influence of microstructural heterogeneity on mechanical properties of friction stir welded joints of T6-treated Al-Zn-Mg alloy 7A52[J]. Metals, 2018, 8: 527 ? 538.
[3] Eivani A R, Vafaeenezhad H, Jafarian H R, et al. A novel approach to determine residual stress field during FSW of AZ91 Mg alloy using combined smoothed particle hydrodynamics/ neuro-fuzzy computations and ultrasonic testing[J]. Journal of Magnesium and Alloys, 2021, 9(4): 1304 ? 1328.
[4] 赵军军, 张平, 王卫欣, 等. 7A52铝合金搅拌摩擦焊的焊缝成形[J]. 焊接学报, 2005, 26(5): 61 ? 64
Zhao Junjun, Zhang Ping, Wang Weixin, et al. Weldbead shaping of friction stir welded 7A52 aluminum Alloy[J]. Transactions of the China Welding Institution, 2005, 26(5): 61 ? 64
[5] Su H, Wu C S. Numerical simulation for the optimization of polygonal pin profiles in friction stir welding of aluminum[J]. Acta Metallurgica Sinica(English Letters), 2021, 34(8): 1065 ? 1078.
[6] Chen D G, Liu J H, Ma Z H, et al. Microstructure and properties of welding joints of 7A52 aluminum alloy by the friction stir welding[J]. Applied Mechanics and Materials, 2014, 2948: 292 ? 296.
[7] 刘红伟, 周琦, 朱军, 等. 7A52铝合金厚板搅拌摩擦焊接头性能研究[J]. 兵器材料科学与工程, 2006, 29(3): 57 ? 60
Liu Hongwei, Zhou Qi, Zhu Jun, et al. Research on joint properties of 7A52 aluminum alloy thick plate by friction stir welding[J]. Ordnance Material Science and Engineering, 2006, 29(3): 57 ? 60
[8] 周鹏展, 钟掘, 贺地求. 7A52铝合金厚板搅拌摩擦焊[J]. 中国有色金属学报, 2006, 16(6): 964 ? 969
Zhou Pengzhan, Zhong Jue, He Diqiu. Friction-stir welding on thick plate of 7A52 aluminum alloy[J]. The Chinese Journal of Nonferrous Metals, 2006, 16(6): 964 ? 969
[9] Sivabalan S, Sridhar R, Parthiban A, et al. Experimental investigations of mechanical behavior of friction stir welding on aluminium alloy 6063[J]. Materials Today:Proceedings, 2021, 37(2): 1678 ? 1684.
[10] 郝利新,贾瑞灵,张慧霞,等. 微弧氧化膜对7A52铝合金搅拌摩擦焊接头腐蚀不均匀性的影响[J]. 焊接学报, 2019, 40(3): 145 ? 150
Hao Lixin, Jia Ruiling, Zhang Huixia, et al. Influence of micro-arc oxidation film on corrosion of inhomogeneity of 7A52 aluminum alloy friction stir welding joint[J]. Transactions of the China Welding Institution, 2019, 40(3): 145 ? 150
[11] Yuvaraj K P, Ashoka V P, Boopathiraja K P. Optimization of process parameters on friction stir welding of AA7075-T651 and AA6061 joint using response surface methodology[J]. Materials Research Express, 2019, 6(9): 6558 ? 6578.
[12] Thanatkij S, Rapeepan P, Kanchana S, et al. Combined response surface method and modified differential evolution for parameter optimization of friction stir welding[J]. Processes, 2020, 8: 1080 ? 1102.
[13] Wasif S, Salman H, Ahmad W, et al. Predicting the tensile strength, impact toughness, and hardness of friction stir-welded AA6061-T6using response surface methodology[J]. International Journal of Advanced Manufacturing Technology, 2016, 87: 1765 ? 1781.
[14] Ramachandran K K, Murugan N, Kumar S S. Performance analysis of dissimilar friction stir welded aluminium alloy AA5052 and HSLA steel butt joints using response surface method[J]. International Journal of Advanced Manufacturing Technology, 2016, 86: 2373 ? 2392.
