外加热源对铝-铜搅拌摩擦焊对接的影响
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摘要
为了改善铝-铜搅拌摩擦焊对接接头的焊缝接头性能,文中采用对焊缝铜一侧引入外加热源的方法,来增加焊接热输入,提高铜侧材料的软化程度.结果表明,外加热源能够有效提高焊缝部位铜一侧的焊接温度,从而增加焊接过程中铜一侧的塑化流动性,形成成形良好的焊接接头.通过焊缝的物相对比可知,外加热源引起的温度场的改变,有效地减少了焊缝中Cu Al,Cu Al2等中间相的含量,增加了铜颗粒在焊缝中的含量.在力学性能上表现为有外加热源的焊缝拉伸强度较高,显微硬度分布均匀.
An external heat source was used to change the temperature distribution around the pin in the friction stir butt welding system of Al/Cu dissimilar metal to improve the mechanical properties of the welded joint. The results show that the external heat source increased the temperature at copper side obviously,which also increased the fluidity of weld joint. The change of temperature field decreased the content of CuA l and CuA l2 in the weld joint through XRD spectrums,and increased the content of copper particle. All of this resulted in the increase in the tensile strength of the weld joint and a uniform distribution of microhardness around the welding line.
An external heat source was used to change the temperature distribution around the pin in the friction stir butt welding system of Al/Cu dissimilar metal to improve the mechanical properties of the welded joint. The results show that the external heat source increased the temperature at copper side obviously,which also increased the fluidity of weld joint. The change of temperature field decreased the content of CuA l and CuA l2 in the weld joint through XRD spectrums,and increased the content of copper particle. All of this resulted in the increase in the tensile strength of the weld joint and a uniform distribution of microhardness around the welding line.
引文
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[2]刘会杰,刘超,沈俊军,等.铝-铜的搅拌摩擦焊研究[J].焊接,2009(9):11-15.Liu Huijie,Liu Chao,Shen Junjun,et al.Progress in friction stir welding of aluminum to copper[J].Welding&Joining,2009(9):11-15.
[3]Xue P,Ni D R,Wang D,et al.Effect of friction stir welding parameters on the microstructure and mechanical properties of the dissimilar Al-Cu joints[J].Materials Science and Engineering:A,2011,528(13):4683-4689.
[4]Galvao I,Loureiro A,Rodrigues D M.Critical review on friction stir welding of aluminium to copper[J].Science and Technology of Welding and Joining,2016,21(7):523-546.
[5]吴小伟,沈以赴,李博,等.铝-铜搅拌摩擦焊搭接焊缝共晶组织形成与抑制[J].焊接学报,2014,35(1):87-90.Wu Xiaowei,Shen Yifu,Li Bo,et al.Formation and inhibition of eutectics in Al/Cu dissimilar metal lap joint[J].Transactions of the China Welding Institution,2014,35(1):87-90.
[6]Esmaeili A,Rajani H R Z,Sharbati M,et al.The role of rotation speed on intermetallic compounds formation and mechanical behavior of friction stir welded brass/aluminum 1050 couple[J].Intermetallics,2011,19(11):1711-1719.
[7]Fagan T,Lemiale V,Nairn J,et al.Detailed thermal and material flow analyses of friction stir forming using a three-dimensional particle based model[J].Journal of Materials Processing Technology,2016,231:422-430.
[8]Kerrar G,Merah N,Shuaib A N,et al.Experimental and Numerical Investigations of friction stir welding of aluminum to copper[C]∥Applied Mechanics,Behavior of Materials,and Engineering Systems.Springer International Publishing,2017:129-138.
[9]李继忠,赵华夏,栾国红.铝合金搅拌摩擦焊物理场三维数值模拟[J].焊接学报,2016,37(5):16-19.Li Jizhong,Zhao Huaxia,Luan Guohong.3D numerical simulation of physical fields of friction stir welding for aluminum alloy[J].Transactions of the China Welding Institution,2016,37(5):16-19.