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第三讲已经谈及,显示脉冲反射法探伤时,缺陷的发现主要由仪器荧光屏上显示的探伤图形变化(有否缺陷回波、底面回波高度或次数、回波时间等)来确认。然而,超声波扫查过程中,由于波束的扩散,界面上的反射或折射以及试件和缺陷形状等原因,不可避免地还会显示假象信号,因此,对探伤图形的分析、解释、判别,乃是超声波探伤人员必须掌握的基本技术之一。
The third lecture has already talked about, when revealing the pulse flaw detection flaw detection, the flaw discovery is mainly confirmed by the change of the flaw detection graph (flaw echo, bottom echo height or frequency, echo time, etc.) displayed on the instrument screen. However, the ultrasonic scanning process inevitably also displays the artifact signal due to beam diffusion, reflection or refraction at the interface, and the shape of the test piece and the defect. Therefore, the analysis, interpretation and discrimination of the test pattern are Ultrasonic testing is one of the basic techniques that must be mastered.