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为了能进行超声焊接工艺的在线检测，必须了解超声焊接的机制。本文对这个问题作了研究。在本实验所用的焊机中，用一块压电晶体作为换能器产生超声振动。在通常的焊接过程中，研究了换能器驱动信号和从机械振动测出的信号这二者的变动情况，同时还研究了这二种信号的各次谐波信号。研究证实，机械振动测出信号的５次谐波对焊接工具的机械振动敏感。设计并通过实验搞清了整个焊接过程中这个信号的属性。从实验见到的结果，提出了一个基于超声功率流的焊接模型。这个模型将一次焊接中出现的谐波波形与该次工艺中的物理现象联系起来。结果人们可以用这个模型来分析谐波信号，了解焊接区中发生的现象和预计焊接效果、即焊接强度。
In order to conduct on-line ultrasonic testing process, we must understand the mechanism of ultrasonic welding. This article made a research on this issue. In the welder used in this experiment, a piezoelectric crystal was used as a transducer to generate ultrasonic vibrations. During the normal welding process, the changes of both the transducer drive signal and the signal measured from the mechanical vibration were studied. At the same time, the harmonic signals of these two kinds of signals were also studied. The study confirmed that the 5th harmonic of the measured mechanical vibration signal is sensitive to the mechanical vibration of the welding tool. Design and experimentally figure out the properties of this signal throughout the welding process. From the experimental results, a welding model based on ultrasonic power flow is proposed. This model relates the harmonic wave appearing in one welding process to the physical phenomena in this process. Results One can use this model to analyze harmonic signals to understand what is happening in the weld zone and to predict the welding effect, ie, weld strength.