焊接能量对铜/钛超声波焊接接头性能的影响

Effect of welding energy on performance of Cu/Ti joints obtained by ultrasonic welding

采用高功率超声波点焊机成功焊接T2纯铜和Ti6Al4V钛合金异种金属,分析了不同焊接能量对接头的界面温度、横截面宏观形貌、界面成形和力学性能的影响。研究发现:随着焊接能量的增加,峰值温度和高温停留时间升高,压痕深度逐渐升高,接头界面均较平直,未出现金属间化合物,存在扩散层,最大厚度为2μm,拉剪力随着接头结合面积的扩大而逐渐增大,最大值为2322 N。接头沿界面靠近铜侧母材断裂,断裂模式由脆性断裂过渡至韧-脆混合断裂。利用ABAQUS有限元数值模拟软件对不同焊接能量下的界面进行应力分析,系统地阐述了铜/钛超声波焊接接头界面成形机理。

The high-power ultrasonic spot welding machine was used to successfully weld T2 pure Cu and Ti6 Al4 V dissimilar metals. The effects of different welding energies on the interface temperature,crosssectional macroscopic morphology, interface formation and mechanical properties of the joints were analyzed. It is shown that with the increase in welding energy,the peak temperature and high temperature residence time increase,the indentation depth increases gradually,the joint interface is flat and no intermetallic compounds appear,There is a diffusion layer with a maximum thickness of 2 μm at the interface. The tensile shear force gradually increases with the bonded area,and the maximum shear force is2322 N. The joint fractures along the interface of the Cu side of the base material,and the fracture mode changes from brittle fracture to ductile-brittle mixed fracture. The stress analysis of the interface under different welding energies was carried out by using ABAQUS finite element numerical simulation software.The interface forming mechanism of Cu/Ti ultrasonic welded joints was systematically expounded.