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用直探头纵波检查方法在销子端面分析了第一次底波 B_1和第二次底波 B_2之间的波形,确定了可能产生的变型波 M_n 的数目和位置。运用 M_1波幅度的变化可以检查小销子轴线附近的缺陷,并在一些试样上验证了这种方法的有效性。
With the straight probe longitudinal wave inspection method, the waveform between the first bottom wave B_1 and the second bottom wave B_2 is analyzed at the end face of the pin, and the number and position of the possible variant waves M_n are determined. The change of amplitude of M_1 wave can be used to check the defects near the pin axis and verify the validity of this method on some samples.