焊缝内部面状缺陷的危害性极大,是压力容器安全使用的主要隐患。近年来,随着“压力容器缺陷评定规范”的推广应用,使用超声波测定面状缺陷自身高度已愈来愈引起人们的关注和重视。本文通过实验室和现场在役容器的试验研究及解剖验证,对各种缺陷测高方法和精度进行评价,以确定可供现场实际使用的缺陷测高方法。 Weld surface defects within the great dangers, is the main hidden dangers of the safe use of pressure vessels. In recent years, with the popularization and application of the “Code for Assessment of Defects in Pressure Vessels”, the use of ultrasonic to determine the height of planar defects has drawn more and more attention and attention. In this paper, through the laboratory and on-site in-service container experimental research and anatomical verification, all kinds of defect height measurement methods and accuracy evaluation to determine the field for the actual use of defect altimetry methods.