The result shows that the velocity field changes with the increase of space from shoulder and stir tool and the flow of weld metal from top to bottom and stir zone to rotation zone also weakens.

实验结果表明：随着距轴肩和搅拌针距离的增大，速度场开始减弱，焊缝金属由顶面向底面、由搅拌区向旋转区的流动也随之减弱。

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The stirrer with bigger shoulder contributes to the transformation of plasticity in the direction of weld thickness, it is easier for onion rings to expand in the weld thickness direction.

轴肩较大的搅拌头有利于塑性金属在焊缝厚度方向上的迁移，洋葱环更易于在厚度方向上扩张。

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