Rotation speed is one of the key reasons which are relative to the quality of friction stir welds and tunnel defect existes at lower rotation speed. 搅拌工具旋转速度是影响接头成型形貌的关键原因之一，速度过低有可能会导致隧道型孔洞缺陷。
Linkages scissored from the twirling pendulums slide up a sleeve on the pole, levering a valve which controls the speed of rotation by adjusting the steam. 与旋转的摆成剪状交叉的联动装置把柱子上的滑动套筒顶起，扳动一个阀门，一个通过对蒸汽进行调整从而控制旋转速度的阀门。
