铜铝异种金属超声波焊接工艺研究.pdf

本 科 毕 业 论 文 （设 计） 论文题目： 铜铝异种金属超声波焊接工艺研究 究 摘 要 铜铝异种金属具有优异性能，在各个领域广泛应用，而铜铝组件的连接是其性能高 效发挥的前提。寻找低能耗、无污染、高效的连接方式是目前面临的重要问题。超声波 焊接作为一种固相焊接方法，有望更好地实现铜铝组件连接。本文利用超声波焊接工艺 对铜和铝进行连接，通过单因素实验研究焊接压力，焊接振幅，焊接能量不同工艺参数 对铜铝焊接接头最大拉伸载荷的影响，进而确定最优工艺参数，并分析中间相和断裂情 况。结果表明，在焊接压力，焊接振幅，焊接能量分别为0.276MPa，45 µm，700J 时， 最大拉伸载荷达到最高值。最优工艺参数下铜铝焊接接头的EDS和XRD 的结果显示， 接头中间相为Al Cu。接头焊接界面区域发生了韧性脆性复合断裂。- 2 关键词：铜铝异种金属；超声波焊接；工艺参数；性能 论文类型：理论研究 I 铜铝异种金属超声波焊接工艺研究 Abstract Copper aluminum dissimilar metals have excellent properties and are widely used in various fields, and the connection of copper aluminum components is the premise of their efficient performance. It is an important problem to find a low-energy, pollution-free and efficient connection mode.As a solid-statewelding method,ultrasonic welding is expectedto better realize the connection of copper and aluminum components. In this paper, the ultrasonic welding process is used to connect copper and aluminum. Through single factor experiment,theeffectsofdifferentprocessparameterson themaximum tensileload ofcopper aluminum weldedjoint are studied, and then the optimal process parameters are determined, andthemesophase and fracture are analyzed.Theresults show that themaximum tensile load reaches the highest value when the welding pressure, welding amplitude, welding energy are 0.276 MPa, 45 µ m, 700 J respectively. The EDS and XRD results of Copper Aluminum welded joint under the optimal process parameters show that the mesophase of the joint is Al Cu,Ductilebrittlecompositefractureoccursattheweldinginterfaceareaofthejoint. 2 KeyWords:Cu-AlDissimilarMetals;UltrasonicWelding;ProcessParameters; Performance TypeofPaper:Theoretical Research II 目