电站锅炉小径管内壁裂纹超声波检测

为防止锅炉炉管爆漏,采用超声波检测电站锅炉小径管内壁裂纹很有必要。介绍电站锅炉小径管内壁裂纹超声波检测方法;重点论述小径管内壁裂纹超声波检测探头的选择原则,参考试块的制作,灵敏度及扫查灵敏度的选择,验收标准的确定等。以水冷壁螺纹管为例,简要说明螺纹管内壁螺纹产生的伪缺陷波的判别和小径管内壁裂纹波的波形特征。实践表明, 所给出的检测方法有利于提高锅炉小径管内壁裂纹检出率。

Ultrasonic Inspection on Inner Surface Cracks of Small-Diameter Boiler Tube in Power Plant

In order to prevent boiler tube explosion and leakage, it is necessary to detect the inner surface cracks of small-diameter boiler tubes using the ultrasonic. This paper introduces the ultrasonic inspection method focusing on the probe selection principles, making of the reference testing blocks, choosing of the sensitivity and scanning sensitivity and the examing standard setting. Taking the water wall tubes as an example, the determination of the false indication of inner tube surface threads and the wave characteristics of the inner surface cracks of small-diameter tubes are briefly described. Practice shows that the given method is helpful to improve the detection rate of the inner surface cracks of small-diameter boiler tubes.