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Guided wave mode and dispersion curve in the circular rod are analyzed, and the time domain waveform of Φ20mm*2m circular rod is analyzed. Though finite element simulation and experiment, the variation law of reflection coefficient of different guided wave modes is analyzed. The L(0,1) is consistent with the change trend of F(1,1) modes for axial and circumferential defects, and the simulation results of L(0,1) modes are consistent with the test results.

In this paper, the finite element numerical simulation is used. The transmission and reflection of both L (0,1) mode and F(1,1) mode of the ultrasonic guided wave were simulated. The transmission and reflection of the ultrasonic guided wave in the pipe were analyzed when the defect in different axial, circumferential, and depth. When the defect’s size changes in the axial direction and circumferential direction, the trend of the two kinds modes’ reflection coefficient is the same. In a certain size, the reflection coefficient of F(1,1) is higher than the L(0,1). When the depth of the effect change, the trend of the two modes’ reflection coefficient is different.