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薛志清, 胡绳荪, 左迪, 申俊琦. 铜铝异种金属激光焊接头组织特征及力学性能[J]. 焊接学报, 2013, (10): 51-54.
引用本文: 薛志清, 胡绳荪, 左迪, 申俊琦. 铜铝异种金属激光焊接头组织特征及力学性能[J]. 焊接学报, 2013, (10): 51-54.
XUE Zhiqing, HU Shengsun, ZUO Di, SHEN Junqi. Microstructural characteristics and mechanical properties of laser-welded copper and aluminum[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2013, (10): 51-54.
Citation: XUE Zhiqing, HU Shengsun, ZUO Di, SHEN Junqi. Microstructural characteristics and mechanical properties of laser-welded copper and aluminum[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2013, (10): 51-54.

铜铝异种金属激光焊接头组织特征及力学性能

Microstructural characteristics and mechanical properties of laser-welded copper and aluminum

  • 摘要: 铜铝异种金属薄板的激光焊加热和冷却速度快,焊缝区温度梯度和成分浓度梯度大,接头微观组织具有特殊性.通过激光焊接试验、拉伸测试、焊缝横截面及断口SEM和DES分析,研究了铜铝薄板的激光搭接焊接头组织分布特征及其对性能的影响.结果表明,在高温度梯度和浓度梯度下焊缝区形成了组织形貌不同的区域,分别是平行排列的板条状过共晶组织区、板条状过共晶组织与共晶组织混合区(简称混合区)、片层状的共晶区以及枝晶状的亚共晶区.拉伸剪切断裂在混合区.随着焊接速度的增加,混合区的宽度变窄,混合区的过共晶组织由等轴状向板条状转变,试件承受的最大剪切力随之增大.

     

    Abstract: The microstructure and mechanical properties of X100 pipeline steel were investigated by optical electron microscope, scanning electron microscope and material testing machine.The results indicate that the microstructure of X100 line pipe is mainly composed of acicular ferrite and granular bainite in weld zones.The polygon ferrite exists in HAZ and the grains are coarser,which lead to softening and embrittlement.The fusion line is clear between outer weld and inner weld.The tensile strength and elongation rate of the welded joint are up to the 805 MPa and 10.7%,respectively.The impact energy is more than 110 J,and the average percent of shear fracture gets to 85% at - 10℃,which is ductile fracture.The results of hardness test show that the hardness of the HAZ of outer weld is higher than that of inner weld.

     

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