“JB1152—81”是由一机、化学、石油三部颁发的锅炉和钢制压力容器对接焊缝超声波探伤标准。标准中规定焊缝超声波探伤采用距离——波幅曲线(以下简称距——波曲线)。距——波曲线是以标准人工孔型作为反射体,表示反射波高度随距离变化的曲线。它对缺陷的评价,较之过去采用的不同距离不同人工孔径的试块对比法,减少了大 “JB1152-81” is a ultrasonic flaw detection standard for butt welds of boilers and steel pressure vessels issued by a machine, chemical and petroleum authority. The standard specifies the ultrasonic flaw detection using distance - amplitude curve (hereinafter referred to as the distance - wave curve). Distance - wave curve is a standard artificial hole as a reflector, reflecting the reflected wave height with the distance curve. Its evaluation of defects, compared with the use of different distances from different artificial aperture test block contrast method, reducing the large