平板对接焊缝的超声检测,一般均采用横波探伤法。在板材或锻件的纵波探伤中,荧光屏上可以看到底波,因而,缺陷的位置能直观地显示。在板材的横波探伤中,则不能直观地显示缺陷的位置,而需根据荧光屏上的横轴刻度(代表水平距离、声程或垂直距离)进行计算来确定缺陷深度。这种办法既麻烦又影响进度。目前,国内普遍采用K值定位法确定缺陷深度: K=tgB=P/d (1) 式中K为斜探头在工件中折射角的正切,实为被测声束与入射点的水平距离和垂直距离之比。用直射法(或一次波法)探伤时的缺陷深度 Flat butt welding ultrasonic testing, are generally used shear wave detection method. In the longitudinal inspection of plates or forgings, the bottom wave can be seen on the phosphor screen, so the position of the defect can be visually displayed. Slab flaw detection, you can not visually display the location of defects, but according to the screen on the horizontal axis scale (representing horizontal distance, sound path or vertical distance) to determine the depth of the defect. This approach is cumbersome and affects the progress. At present, the K-value localization method is generally used to determine the depth of defects: K = tgB = P / d (1) where K is the tangent of the angle of refraction of the oblique probe in the workpiece, which is the horizontal distance between the measured beam and the incident point The ratio of vertical distance. Using direct method (or wave method) flaw depth inspection