大型薄壁多层编织铜超声焊接接头组织与性能

利用超声波焊接技术实现大平面超薄铜箔与多股双层镀银编织铜的焊接,该技术服役于将来的中国空间站。分析了不同参数对连接力学性能的影响,利用扫描电子显微镜对典型接头界面处的微观组织特征进行了分析,并采用有限元仿真的方式对连接行为进行了仿真。结果表明:采用超声波焊接实现了薄壁铜层与镀银编织铜的焊接,焊点连接面处组织致密,无明显缺陷;焊点连接处由Ag和Cu元素组成,焊接温度远未达到熔点,为低温连接行为,其连接机理为扩散连接;在焊接能量为120 J、0.276 MPa参数下,母材拉脱力可达到90 N。

Microstructure and Mechanical Properties of Ultrasonic Welding Joint of Large Multilayer Silver-Plated Thin-Walled Woven Copper in a Large Scale

The ultrasonic welding technology is adopted to weld large plane ultra-thin copper foil with multi-ply double-layer silver-plated woven copper for the future Chinese space station. The effects of different parameters on the mechanical properties of the joint are analyzed, the microstructure characteristics of the typical joint interface are analyzed by scanning electron microscope, and the finite element simulation is used to simulate the welding behavior. The results show that the welding of thin-walled copper foil and silver-plated woven copper is realized by the ultrasonic welding. The structure of the solder joint is dense, and there is no obvious defect. The solder joint is composed of Ag and Cu elements. The welding temperature is far from the melting point, and it is a low temperature welding behavior, the mechanism of which is diffusion. The experimental results show that when the welding energy is 120 J and the welding pressure is 0.276 MPa, the tensile force of the base material can reach 90 N.