When the ultrasonic spot welding machine of Changzhou Jiapu mechanical equipment Co., Ltd. is under the action of compression force, the vacuum core group bubble will produce strong impact force when it is crushed by pressure, so as to peel off the dirt on the surface of the cleaned object, so as to achieve the purpose of precision cleaning. Direct inflow: the phenomenon that ultrasonic wave flows along the direction of sound propagation in liquid is called direct inflow. When the intensity of the sound wave is 0.5w/cm2, the direct flow can be seen by the naked eye, and the flow is perpendicular to the vibration surface, and the flow velocity is about 10cm / s. Through this direct flow, the micro oil and dirt on the surface of the cleaned object are stirred, and the cleaning liquid on the surface of the dirt also generates convection. The solution of the dissolved dirt is mixed with the new liquid, so that the dissolution speed is accelerated, which plays a great role in the transportation of the dirt. Acceleration: acceleration produced by the propulsion of liquid particles.