计算流体力学在搅拌摩擦焊的应用研究

Application of Computational Fluid Dynamics in Friction Stir Welding

本文基于计算流体力学理论,建立搅拌摩擦焊过程有限元模型,模拟得到了焊接过程中不同工艺参数下的速度矢量图和材料流线分布图,结果表明,当搅拌头的旋转速度增加时,搅拌头附近区域材料流动更加剧烈,焊接速度的提高对搅拌头及其附近区域材料的流动影响不大。在焊接过程中,增加焊接速度可以增强焊件底部的流动性,但是不能提高焊件表面的流动性。增加搅拌头转速可以明显提高焊件表面的流动性,但是对焊件底部的流动性没有影响。

In this study, a finite element model is established based on the computational fluid dynamics. The velocity vector diagram and the streamline distribution of the different process parameters are obtained in the FSW process. The results show that with the increase of the rotating speed of the pin, the material flow near the pin is more violent and the effect of welding speed on material flow is not obvious. It is indicated from the simulation results that the welding speed can be enhanced to increase liquidity at the bottom of the weldment, but not to improve liquidity of the weldment surface.