The result shows that the velocity field decreases with increasing space between shoulder and stir tool and the flow pattern decreases from top to bottom and from stir zone to rotation zone.

• 试验结果表明：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；