本文主要探讨石油钻探用钴铤焊缝超声探伤的意义和方法,以及探伤条件的选择、缺陷的评价等技术问题,并提出了初步的检测标准。 This paper mainly discusses the significance and methods of ultrasonic flaw detection of cobalt collars in oil drilling, as well as the selection of testing conditions, the evaluation of defects and other technical problems, and puts forward the preliminary testing standards.