热力发电用锅炉汽包,存在焊接缺陷、母材缺陷,但大多还是汽包裂纹。由于汽包壁较厚,一般超声波探伤都采用深度调扫描速度和利用K值探头。当探测纵缝时,由于曲率半径的影响,荧光屏上所反映的深 Thermal power boiler drum, there are welding defects, base metal defects, but most are still drum cracks. As the drum wall is thick, the general ultrasonic flaw detection using depth scan speed and the use of K-value probe. When detecting longitudinal slits, the depth of the screen is reflected by the radius of curvature