Al-Mg合金超高频脉冲VP-GTAW电流参数优化
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摘要
以铝镁系5A06铝合金为对象,开展了复合超高频脉冲变极性钨极气体保护电弧焊(Hybrid Ultrasonic Frequency Pulsed Variable Polarity Gas Tungsten Arc Wending, HPVP-GTAW)焊接电流参数优化研究。利用正交试验方法设计了焊接实验,以接头薄弱区的显微硬度为评价指标,以HPVP-GTAW焊接电流特征参数为影响因素,分别采用极差分析法和回归分析法对实验结果进行分析与讨论。结果表明,变极性电流频率fL、高频脉冲频率fH和脉冲电流比例系数ψ(定义为高频脉冲基值电流Ib、高频脉冲峰值电流Ip和脉冲占空比δ的综合作用)的最优参数匹配依次为1kHz、20kHz和0.6(Ib为75 A,Ip为180 A,δ为0.2)。fL对显微硬度影响最为显著,fH影响作用次之,ψ对显微硬度影响最弱。最优参数匹配的条件下,接头的显微硬度、抗拉强度、延伸率和断面延伸率分别达到母材性能的84.7%、94.3%、80%和93.4%。
Optimization of ultrahigh-frequency pulsed VP-GTAW(HPVP-GTAW) welding parameters for 5 A06 aluminum alloy was carried out.Taguchi method was employed to design the experiment.The microhardness of the fusion zone and heat affected zone(HAZ) was taken as an indicator,and the characteristic welding current parameters of HPVP-GTAW were taken as factors.The experimental results were analyzed by both the range analysis method and the regression analysis method.Results show that the optimal parameters of variable polarity current frequency fL,pulse frequency fH and pulsed current proportional coefficient ψ are 1 kHz,20 kHz and 0.6(high-frequency background current 75 A,high-frequency peak current 180 A,duty cycle of high-frequency pulse 0.2),respectively.Meanwhile,fL influences microhardness most significantly,followed by fH,and the impact extent of ψ on the microhardness is the least.The confirmatory experiment shows that the microhardness,tensile strength,elongation and ratio of reduction with the obtained optimal parameters are 84.7%,94.3%,80% and 93.4% of those of the base metal,respectively.
Optimization of ultrahigh-frequency pulsed VP-GTAW(HPVP-GTAW) welding parameters for 5 A06 aluminum alloy was carried out.Taguchi method was employed to design the experiment.The microhardness of the fusion zone and heat affected zone(HAZ) was taken as an indicator,and the characteristic welding current parameters of HPVP-GTAW were taken as factors.The experimental results were analyzed by both the range analysis method and the regression analysis method.Results show that the optimal parameters of variable polarity current frequency fL,pulse frequency fH and pulsed current proportional coefficient ψ are 1 kHz,20 kHz and 0.6(high-frequency background current 75 A,high-frequency peak current 180 A,duty cycle of high-frequency pulse 0.2),respectively.Meanwhile,fL influences microhardness most significantly,followed by fH,and the impact extent of ψ on the microhardness is the least.The confirmatory experiment shows that the microhardness,tensile strength,elongation and ratio of reduction with the obtained optimal parameters are 84.7%,94.3%,80% and 93.4% of those of the base metal,respectively.
引文
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[4]Cong Baoqiang(从保强),Qi Bojin(齐铂金),Zhou Xingguo(周兴国)et al.Acta Metallurgica Sinica(金属学报)[J],2009,45(9):1057
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[6]Qiu Ling(邱灵),Fan Chenglei(范成磊),Lin Sanbao(林三宝)et al.Transactions of the China Welding Institution(焊接学报)[J],2007,28(11):81
[7]Yang M X,Zheng H,Qi B J et al.Journal of Materials Processing Technology[J],2017,243:9
[8]Yang M X,Zheng H,Li L.Applied Sciences[J],2017,7(1):45
[9]Zhao Jiarui(赵家瑞),Li Yidan(李义丹).Journal of Tianjin University(天津大学学报)[J],1989,4(3):25
[10]Qi B J,Yang M X,Cong B Q.International Journal of Advanced Manufacturing Technology[J],2013,66(12):1545
[11]Cook G E,Eassa E H.IEEE Transactions on Industry Applications[J],1985,21(5):1294
[12]Yang M X,Zhou Y,Qi B J.Weld World[J],2015,59(6):875
[13]Li Yulong(李玉龙),Cong Baoqiang(从保强),Yang Mingxuan(杨明轩)et al.Journal of Beihang University(北京航空航天大学学报)[J],2014,40(5):72
[14]Chen Ying(陈影),Shen Changbin(沈长斌),Ge Jiping(葛继平)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2012,41(S2):109
[15]Stoeckinger G R.Welding Journal[J],1973,53(12):558
[16]Liao X L,Zhai Q J,Luo J et al.Acta Meterialia[J],2007,55(9):3103
[17]Li J,Ma J H,Gao Y L et al.Material Science and Engineering A[J],2008,490:452
[18]Furukawa M,Horita Z,Nemoto M et al.Acta Meterialia[J],1996,44(1):4619
[19]Ion J C,Easterling K E,Ashby M F.Acta Metallurgica[J],1984,32(11):1955
[20]Sato Y S,Urata M,Kokawa H.Metallurgical and Materials Transactions[J],2002,33(3):625
[21]Ross P J.Taguchi Techniques for Quality Engineering[M].New York:John Wiley&Sons,1997:395
[22]Zhou Guanghong(周广宏),Ding Hongyan(丁红燕),Zhu Yufu(朱雨富)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2016,45(5):1117
[23]Arora J S.Introduction to Optimum Design[M].New York:Wiley,2005:75
[24]Wang Y P,Qi B J,Cong B Q et al.Applied Sciences[J],2017,7(5):485