超声波的功率密度对超声波的清洗效率影响很大。使用超声波清洗的主要参数就是功率，或者确切的说，是清洗槽内被清洗工件表面的功率密度的大小，它直接影响到超声声强的大小，声强大小又是直接影响空化效果的因素。超声波清洗的效果不一定完全与功率×清洗时间成正比。可以想象有时用小功率的清洗机，花费很长时间也不会有特别明显的效果，如果当大功率超声波清洗机功率达到一定值，则可以很快将污垢去除。

The power density of ultrasound has a significant impact on the cleaning efficiency of ultrasound. The main parameter for using ultrasonic cleaning is power, or more precisely, the power density on the surface of the workpiece being cleaned in the cleaning tank, which directly affects the ultrasonic sound intensity. The sound intensity is also a factor that directly affects the cavitation effect. The effect of ultrasonic cleaning may not be directly proportional to the power multiplied by the cleaning time. It can be imagined that sometimes using a low-power cleaning machine may not have a particularly significant effect even after a long time. If the power of a high-power ultrasonic cleaning machine reaches a certain value, dirt can be quickly removed.

但功率过大空化强度将大大增加，清洗效果是提高了，但会使较精密的零件产生蚀点得不偿失，而且超声波底部振动处空化严重，很容易受到水点腐蚀减少超声波清洗剂的寿命。太强的声强会造成空化泡过多，形成声波屏障，是声波不容易传导到液体空间。在远离声源的地方声波强度会减弱很快，不能形成有效的清洗。

However, if the power is too high, the cavitation intensity will greatly increase, and the cleaning effect will be improved. However, it will cause more precise parts to produce corrosion points, which is not worth the cost. Moreover, the cavitation at the bottom vibration of the ultrasonic wave is severe, making it easy to be corroded by water points and reducing the service life of the ultrasonic cleaning agent. Excessive sound intensity can cause excessive cavitation bubbles, forming a sound barrier that makes it difficult for sound waves to propagate into liquid spaces. In places far away from the sound source, the intensity of sound waves will weaken quickly and cannot form effective cleaning.

超声波的功率密度越大空化作用越强其清洗效果越好，对表面污垢严重、形状复杂、有深孔盲孔零件，应选用较大的功率密度。频率20~50Khz，超声波能量密度为2~3W/cm?；一般情况下，超声波清洗机的功率密度设在0.5～1W/cm?。

The higher the power density of ultrasound, the stronger the cavitation effect, and the better its cleaning effect. For parts with severe surface dirt, complex shapes, and deep blind holes, a higher power density should be selected. Frequency of 20-50Khz, ultrasonic energy density of 2-3W/cm? Best; In general, the power density of ultrasonic cleaning machines is set at 0.5-1W/cm?.