搅拌摩擦焊过程接触熔化物理模型与分析

利用接触熔化理论建立了搅拌摩擦焊的物理模型,并进行了分析计算,探讨了搅拌摩擦焊焊缝的形成机制。指出搅拌摩擦焊过程中,能量沉积引起搅拌头前方摩擦界面处被焊材料的微结构发生改变,形成粘性类液层。研究结果表明,形成稳定厚度的类液层是实现焊接的必要条件。类液态金属在搅拌头的旋转作用下向后高速喷射,最终在搅拌头后方沉积形成弧形层状焊缝组织。

Contact Melting Physical Model and Analysis of Friction Stir Welding Processes

The theory of contact melting was introduced to the study of friction stir welding(FSW) to set up the physical model for quasi-liquid layer and the related calculations were carried out,the formation mechanism of weld was discussed as well.The research indicates that during the process,the microstructure of welding materials at the friction interfaces change due to energy concentration,and viscous quasi-liquid layer forms.The results show that it is necessary for welding to form certain thickness quasi-liquid layers.The micro quasi-liquid metals are sprayed backwards to solidify to form final weld.