P91/P92钢管道对接焊缝微裂纹的超声波检测

The Ultrasonic Testing of Micro-crack in P91/92 Steel Pipe Butt Weld

摘要: 随着P91/P92钢在国内火力发电机组的大量应用, 对其焊接缺陷的检测也成为质量监督的重点工作。目前,在运行检修过程中, 超声波检测出的缺陷主要为以微小裂纹类缺陷为主的层间缺陷。通过对某厂P91钢主蒸汽管道对接焊缝的超声波检测, 对微小裂纹的缺陷回波波形特征进行了分析, 对该类缺陷在超声波检测中的判断和识别方法进行了探讨和总结。

Abstract: Due to the large number application of P91/P92 steel of thermal power generating units in domestic, weld defects detection problem also gradually became the focus of quality supervision work. In the process of operation maintenance, the defects detected by Ultrasonic inspection were mainly micro-cracks in the interlayer. In this paper,by means of ultrasonic inspection on the P91 steel butt weld of main steam pipe in a factory, the waveform character of micro-cracks was analyzed, and the way how to judge and identify the defects in ultrasonic testing was studied and discussed.