基于回归分析的钛合金微电阻点焊焊接工艺优化
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摘要
为了研究焊接工艺参数对钛合金微电阻点焊焊接质量的影响规律以及获得最优的焊接工艺参数,利用中心组合试验设计对0.4 mm厚的TC2钛合金进行焊接试验,对焊接试样进行准静态拉伸试验,获取了表征焊点质量优劣的熔核直径、拉伸力、拉伸位移和失效能量.利用灰熵法得到了每个焊接质量指标的权值,将其加权为焊接综合质量指标.采用逐步回归分析方法得到了焊接工艺参数(焊接电流、焊接时间以及电极压力)与焊接综合质量指标之间的回归方程.在此基础上分析了焊接工艺参数两两交互作用对焊接质量的影响规律,采用爬山优化算法得到了最优的焊接工艺参数.
Central composite experimental design was used for the thickness of 0. 4 mm TC2 titanium alloy in order to optimize the small scale spot welded joint quality. The welding current,electrode force and welding time were picked out as the process parameters and the nugget size,peak load,tensile shear displacement and failure energy were weighted into a welding quality comprehensive index based on entropy measurement method. The mathematical model between the welding quality comprehensive index and process parameters was obtained using regression analysis. The interaction effects of the welding parameters on welding quality were explored. The optimal combination of welding process parameters was achieved by using hill climbing method. The results of validation experiments showed that this study could effectively forecast and optimize the welding quality for the TC2 titanium alloy with the thickness of 0. 4 mm.
Central composite experimental design was used for the thickness of 0. 4 mm TC2 titanium alloy in order to optimize the small scale spot welded joint quality. The welding current,electrode force and welding time were picked out as the process parameters and the nugget size,peak load,tensile shear displacement and failure energy were weighted into a welding quality comprehensive index based on entropy measurement method. The mathematical model between the welding quality comprehensive index and process parameters was obtained using regression analysis. The interaction effects of the welding parameters on welding quality were explored. The optimal combination of welding process parameters was achieved by using hill climbing method. The results of validation experiments showed that this study could effectively forecast and optimize the welding quality for the TC2 titanium alloy with the thickness of 0. 4 mm.
引文
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[2]姚杞,李洋,罗震,等.永磁体磁场对铝合金电阻点焊力学性能及微观组织的影响[J].焊接学报,2016,37(4):52-56.Yao Qi,Li Yang,Luo Zhen,et al.Impact of external magnetic field generated by permanent magnet on mechanical property and microstructure of aluminum alloy resistance spot weld[J].Transactions of the China Welding Institution,2016,37(4):52-56.
[3]Pashazadeh H,Gheisari Y,Hamedi M.Statistical modeling and optimization of resistance spot welding process parameters using neural networks and multi-objective genetic algorithm[J].Journal of Intelligent Manufacturing,2016,27(3):549-559.
[4]Muhammad N,Manurung Y H P,Jaafar R,et al.Model development for quality features of resistance spot welding using multiobjective Taguchi method and response surface methodology[J].Journal of Intelligent Manufacturing,2013,24(6):1175-1183.
[5]Ashadudzzaman M,Choi I D,Kim J W,et al.Effect of initial welding current for adaptive control and its optimization to secure proper weld properties in resistance spot welding[J].Journal of Welding and Joining,2015,33(6):13-20.
[6]Thakur A G,Nandedkar V M.Optimization of the resistance spot welding process of galvanized steel sheet using the Taguchi method[J].Arabian Journal for Science and Engineering,2014,39(2):1171-1176.
[7]林健,雷永平,赵海燕,等.微连接接头在热疲劳过程中的破坏规律[J].焊接学报,2009,30(11):65-68.Lin Jian,Lei Yongping,Zhao Haiyan,et al.Failure of soldered joint during thermal fatigue test[J].Transactions of the China Welding Institution,2009,30(11):65-68.
[8]Fukumoto S,Fujiwara K,Toji S,et al.Small-scale resistance spot welding of austenitic stainless steels[J].Materials Science and Engineering:A,2008,492(1):243-249.
[9]Chen F,Tong G Q,Ma Z,et al.The effects of welding parameters on the small scale resistance spot weldability of Ti-1Al-1Mn thin foils[J].Materials&Design,2016,102:174-185.
[10]Chen Y C,Tseng K H,Cheng Y S.Electrode displacement and dynamic resistance during small-scale resistance spot welding[J].Advanced Science Letters,2012,11(1):72-79.
[11]Banh Q N,Shiou F J.Determination of optimal small ball-burnishing parameters for both surface roughness and superficial hardness improvement of STAVAX[J].Arabian Journal for Science and Engineering,2016,41(2):639-652.