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      It has been proved by research that when ultrasonic waves act on the liquid, the bursting of each bubble in the liquid will produce a shock wave with great energy, which is equivalent to instantaneously generating a high temperature of several hundred degrees and a pressure of up to thousands of atmospheres. The phenomenon is called "cavitation". The ultrasonic cleaning machine uses the shock wave generated by the rupture of bubbles in the liquid to clean and wash the inner and outer surfaces of the workpiece.

The ultrasonic wave propagates in the liquid, so that the liquid and the cleaning tank vibrate together at the ultrasonic frequency. When the liquid and the cleaning tank vibrate, they have their own fixed frequency. This vibration frequency is the frequency of the sound wave, so people hear the buzzing sound.

Ultrasonic is a kind of mechanical wave whose vibration frequency is higher than that of sound wave. It is generated by the vibration of the transducer chip under the excitation of voltage. It has high frequency, short wavelength, small diffraction phenomenon, especially good directionality and can be directed as a ray. characteristics of dissemination. Ultrasound has great penetration ability for liquid and fixation, especially in sunlight-opaque fixation, it can penetrate a depth of tens of meters. When the ultrasonic wave encounters impurities or interfaces, it will produce significant reflection to form an echo, and when it encounters a moving object, it will produce the Doppler effect. Therefore, ultrasonic testing is widely used in industry, national defense, biomedicine and so on.