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报导了超声波检测焊缝时由余高引起的一种变型纵波反射现象特例，总结了该种变型纵波的特点，提出了将其推广应用在任意厚度焊缝的检测中识别该种变型纵波的方法。
A special case of modified longitudinal wave reflection caused by residual height when ultrasonic welding seam is detected is reported. The characteristics of this kind of modified longitudinal wave are summarized. A method of identifying this kind of modified longitudinal wave in the detection of any thickness weld is proposed .