During the friction stir welding process of aluminium alloy,the plastic metal flow in the weld is a kind of single-phase flow. In this paper,aiming at numerical simulation and analysis of this single-phase flow,computational fluid dynamics (CFD) commercial software FLUENT is applied and a 3-D flow filed is obtained. According to the related results of flow field, the flow patterns and tracks of the plastic metal flow are observed visually. This can give a reference to the study and discovery of the metal flow mechanism in the weld of friction stir welding process.%铝合金搅拌摩擦焊接焊缝区域金属流是单相流.针对这种单相流搅拌摩擦焊接过程应用大型计算流体动力学(CFD)软件FLUENT进行了数值模拟与分析,得到其三维流场.根据流场得到的相关结果可以观察焊缝区塑性金属流动形态与轨迹,为探究与揭示搅拌摩擦焊接过程中焊缝区塑性金属流变机理提供参考.
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