焊接振幅对铜/铝超声波焊接的影响  

Effect of vibration amplitude on ultrasonic welding of Cu/Al

作　　者：李欢[1] 张长鑫 周亢 曹彪[3] 黄朝望 LI Huan;ZHANG Changxin;ZHOU Kang;CAO Biao;HUANG Chaowang(Yangtze University,Jingzhou,434023,China;Beijing Institute of Technology,Beijing,100081,China;South China University of Technology,Guangzhou,510640,China)

机构地区：[1]长江大学,荆州434023 [2]北京理工大学,北京100081 [3]华南理工大学,广州510640

出　　处：《焊接学报》2023年第7期40-47,I0005,共9页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51605103);湖北省重点研发计划资助项目(2020BAB055);湖北省教育厅科学研究计划重点项目(D20221306)。

摘　　要：焊接振幅是超声波焊接的主要参数,但目前关于焊接振幅对超声波焊接影响机制的认识较少.研究了焊接振幅对铜/铝超声波焊接过程,包括工件的振幅分配、界面温度、中间相分布、材料塑性变形以及接头性能的影响.结果表明,在焊接压力1575 N、焊接时间0.5 s时,随着焊接振幅增大,上工件振幅呈现近似线性增长;下工件振幅在焊接过程中均呈现逐渐近似线性增加的趋势.在整个焊接过程中,焊接振幅越大,下工件的振幅越高.在焊接振幅为25μm时,获得了最大拉剪力为3150 N的铜/铝接头.高的焊接振幅提升了焊头与上工件以及工件之间的相对运动速度,加速了焊接界面的温度升高及材料的塑性变形,增强了界面原子的扩散,最终促进了较高质量的铜/铝超声波焊接接头的形成.创新点:(1)研究了焊接振幅对铜/铝大功率超声波焊接过程的焊头、工件的振动位移以及材料塑性变形的影响.(2)从工件的振幅分配及塑性变形、界面的冶金反应上揭示了高振幅下的焊接质量较高的机制.Vibration amplitude is an important parameter of ultrasonic welding,but insights into the influence mechanism of vibration amplitude on ultrasonic welding are few.The effects of vibration amplitude on the process of Cu/Al ultrasonic welding were investigated in this study,including vibration amplitude distribution of specimens,interfacial temperature,intermediate phase distribution,materials plastic deformation,and properties of joint.The results show that under the welding pressure of 1575 N and welding time of 0.5 s,with the increase of welding amplitude,the vibration amplitudes of the upper specimen exhibit a linear growth,and the amplitudes of the lower specimen tend to show a near-linear growth.During the welding process,the higher the vibration amplitude,the higher the vibration amplitude of the lower specimen is.When the vibration amplitude is set at 25μm,a Cu/Al joint is obtained with a maximum tensile-shear force of 3150 N.High vibration amplitude has increased the relative motion speed among the sonotrode,the upper specimen and the specimen,which has sped up the temperature rise in the welding interface and the plastic deformation of the material,thus accelerated the interfacial atoms diffusion and promoted the formation of high quality Cu/Al ultrasonic welding joints.Highlights:(1)The effects of vibration amplitude on the vibration displacement of sonotrode and specimens,and plastic deformation of specimens were investigated during Cu/Al high power ultrasonic welding process.(2)The mechanism of high welding quality joints under high amplitude is explicated from aspects of vibration amplitude distribution and plastic deformation of specimen as well as metallurgical reactions at interfaces.

关 键 词：超声波焊接 振幅 塑性变形 微观组织 力学性能 

分 类 号：TG456[金属学及工艺—焊接]