核电站小径薄壁管的超声检测方法

Ultrasonic detection method of small thin-walled tube in nuclear power plant

为了对核电站中的小径薄壁管实施有效检测,介绍了水浸聚焦横波法和水浸聚焦纵波直入射法,分析确定了探头的工艺参数,并在含有局部磨损、环形磨损、轴向裂纹、周向裂纹、通孔等缺陷的样管上进行了对比检测。结果表明,两种超声检测方法对于不同缺陷的检出、定量各有优劣,其中水浸聚焦纵波直入射法对于磨损、肿胀、通孔等缺陷的检出能力较强,缺陷定量精确;水浸聚焦横波法对于裂纹检出能力较强,但难以定量;两种方法结合、相互验证,可大幅提升缺陷的检出能力。

In order to effectively detect small thin-walled tubes in nuclear power plants,the water immersion focused S-wave method and P-wave method were introduced.The technological parameters of the probes were studied and determined,and the comparative detection was carried out on the sample tubes with local wear,annular wear,axial cracks,circumferential crack,through holes and other defects.The results show that the two ultrasonic detection methods had their own advantages and disadvantages in the detection and quantification of different defects.Among them,the water immersion focused P-wave method had a strong detection ability for the defects such as wear,swelling and through hole,and the quantification of defects were accurate.Water immersion focused shear wave method was strong in crack detection,but difficult to quantify.The combination and mutual verification of the two methods can greatly improve the ability of defect detection.