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在生产实践中,发现使用不同折射角的超声横波探测工件内部相同波程,相同大小的缺陷时,缺陷反射波的声压有所差异。因此,在目前广泛应用的A型显示的脉冲反射式超声波探伤仪的萤光屏上显示的缺陷反射波的幅度也随之有所差异,从而给缺陷的定量带来了困难。本文从试验分析及理论计算,试图找出超声横波折射角与缺陷反射声压之间的关系,以达到较准确地对缺陷进行定量的目的,同时为工件的返修、判废提供较准确的数据。
In the practice of production, it is found that the sound pressure of the defect reflected wave is different when using the ultrasonic shear waves with different refraction angles to detect the same stroke and the same size of defects in the workpiece. Therefore, the widely used A-type pulse reflection ultrasonic flaw detector displays the magnitude of the reflected light on the screen also will be different, resulting in the quantification of defects has caused difficulties. Based on the experimental analysis and theoretical calculation, this paper attempts to find out the relationship between the refraction angle of ultrasonic shear wave and the reflected sound pressure of flaw, so as to achieve the purpose of quantitatively determining the flaw accurately. At the same time, it provides more accurate data for reworking and rejecting the workpiece .