蒸汽发生器传热管超声检测缺陷的识别

Identification of defects in ultrasonic inspection of heat transfer tubes of steam generators

对蒸汽发生器传热管超声检测报警管材的缺陷进行统计和分析,对典型的5类缺陷分别采用金相显微镜进行表面宏观观察和缺陷深度测量,从而确定缺陷产生的原因。结果显示:蒸汽发生器传热管实际生产过程中的缺陷多以纵向缺陷为主,横向缺陷较为少见,且多为外表面缺陷;缺陷的深度与缺陷处最大超声波幅不是线性关系。

The defects of alarm steam generator heat transfer tubes during ultrasonic examination were counted and analyzed. There were mainly 5 typical types of defects. The surface macroscopic observation and defect depth measurement are carried out by means of metallographic microscope to determine the cause of the defects. The results show that the main defects during the actual production process of steam generator heat transfer tubes are longitudinal defects. The transverse defects are rare and most of them are external surface defects. The depth of the defect is not linearly related to the maximum ultrasonic amplitude of the defect.