What are the reasons for the effect of ultrasonic welding?

The quality of ultrasonic plastic welding depends on the amplitude of the transducer tool head, the pressure applied and the welding time. The welding time and the pressure of the tool head can be adjusted, and the amplitude is determined by the transducer and the horn. There is an appropriate value for the interaction of these three quantities. When the energy exceeds the appropriate value, the melting amount of plastic is large and the welding is easy to deform. If the energy is small, it is not easy to weld, and the pressure added can not be too large.