超声波焊接铜-铝导线接头的显微组织与力学性能  

Microstructure and mechanical properties of ultrasonic welded copper to aluminum cables joints

作　　者：成先明 杨可[2] 刘思沾 季珊林 王健[1] Xian-ming CHENG;Ke YANG;Si-zhan LIU;Shan-lin JI;Jian WANG(College of Mechanical and Electrical Engineering,Hohai University,Changzhou 213022,China;College of Materials Science and Engineering,Hohai University,Changzhou 213022,China)

机构地区：[1]河海大学机电工程学院,常州213022 [2]河海大学材料科学与工程学院,常州213022

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第10期3027-3038,共12页中国有色金属学报（英文版）

基　　金：financially supported by the National Key Research and Development Program of China(No.2017YFE0100100);the Changzhou Key Research and Development Plan,China(No.CE20205046);the Fundamental Research Funds for the Central Universities of China(No.B220203019)。

摘　　要：以BVR2.5铜导线和BLV6.0铝导线为研究对象,采用不同焊接参数进行超声波焊接。采用SEM、EDS、数字测温仪、显微硬度计和拉伸试验机研究铜-铝导线接头的显微组织和力学性能。结果表明,当焊接压力为0.21 MPa、焊接振幅为31%和焊接时间为860 ms时,可以获得拉伸载荷为355.6 N的接头。铜/铝相互扩散厚度约3μm,焊接峰值温度为212.2℃,没有生成脆硬性的中间相。最佳焊接工艺参数下接头在铜侧断裂,断口为韧-脆混合断裂模式,说明接头性能较好。The experiments of ultrasonic welding were carried out for BVR2.0 copper(Cu)cables and BLV6.0 aluminum(Al)cables with different welding parameters.Scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),temperature measurement,microhardness evaluation and tensile tests were conducted to investigate the microstructure and mechanical properties of Cu−Al cables joints.The results show that the tensile load of Cu−Al joints reaches 355.6 N,while the welding parameters are set as follows:welding pressure of 0.21 MPa,amplitude of 31%,and time of 860 ms.The diffusion thickness of well-welded Cu−Al joint is only about 3μm and the peak temperature is 212°C,which avoids the formation of intermetallic(IMC)effectively.The joint fractures on the copper side rather than the interface of the Cu−Al with a ductile−brittle hybrid fracture mode,indicating that the joint has excellent properties.

关 键 词：超声波焊接 焊接参数 铜-铝导线接头 显微组织 力学性能 

分 类 号：TG453.9[金属学及工艺—焊接]