The Binding Mechanism Of Cold Pressing Needle

In view of the bonding mechanism of crimp contact, the atomic diffusion behavior of the crimp contact pin joint interface was comprehensively tested by neutron activation, electron microscope scanning, spectral analysis and other testing methods. It was found that there was no mutual diffusion behavior between dissimilar metals in the tested contact socket crimp joint. Further transmission electron microscope observation and analysis of the interface area of ​​crimp contact female joint showed that the interface area of ​​the joint was composed of fine crystals crushed by extrusion. The crushed fine crystals interlocked at the interface to increase the physical contact area between the welded metals, forming intercrystalline bonding between the crushed fine crystals, and bonding can be achieved without diffusion between metal atoms. According to the above analysis results, the butt joint between incoherent metals and liquid and solid immiscible metals was achieved crimp contact male. The cold pressing weldability between various combinations of dissimilar metals was further explained.