基于螺纹锥形搅拌头的搅拌摩擦焊三维流场仿真研究

摘要

本文利用CFD软件包FLUENT建立了带螺纹表面的锥形搅拌头搅拌摩擦焊三维流动模型.通过数值模拟得到了焊缝沿厚度方向的水平切面速度矢量图,截面的速度矢量图以及用于观察材料流动行为的流动线图.同时分析了搅拌头表面螺纹对塑化金属流动行为的影响及焊缝塑化金属的流动规律.模拟结果对于搅拌摩擦焊过程中焊缝处塑化金属流动以及焊缝形成机理研究具有重要的指导意义.%A 3D flow model is built by adopting the CFD code, FLUENT, to simulate the process of friction stir welding by using tapered tool with threaded profile. The horizontal velocity vector diagrams in the different positions of weld and cross-section velocity vector diagrams are obtained by numerical simulation as well as streamlines of plastic metal. And the influence of threaded profile on metal flow behavior and its flow rule are analyzed. Simulation results are important to study the metal flow during weld and the mechanism of the weld formation.