Phased array ultrasonic testing of BOSS welds in nuclear power plant
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摘要: 核电站BOSS焊缝（核辅助系统小支管与主管连接的管座焊缝）在焊接和服役时可能会产生缺陷，必须对其实施无损检测。与目前常用的渗透和射线检测方法相比，相控阵超声检测（PAUT）技术具有检测灵敏度高、缺陷可定位等优势，可应用于BOSS焊缝的缺陷检测。以SKETCH14规格BOSS焊缝为例，对其开展相控阵超声检测。首先结合BOSS焊缝几何结构，选取适配的PAUT探头和楔块，制定检测方案；加工了处于不同深度的8个ϕ2 mm横通孔和4个高度为3 mm的内壁槽，分别模拟体积型和面积型缺陷；最后进行了检测试验。试验结果表明，采用该PAUT检测方案，可实现12个缺陷的有效检出，且缺陷深度定量误差不超过6.9%。Abstract: In the process of welding and service for the BOSS welds (The welds of pipe seat connecting the small branch pipe and the main pipe of the nuclear auxiliary system) in nuclear power plants, it is necessary to detect the produced defects are necessary to detect by nondestructive testing. Compared to the commonly used penetrant testing and radiographic testing, phased array ultrasonic testing (PAUT) has the advantages of high detection sensitivity and location accuracy and can be applied to defect detection of BOSS welds. In this paper, PAUT is performed on the BOSS welds of SKETCH14 specification. Appropriate PAUT probes and wedges are chosen in combination with the geometry of BOSS welds to determine the detection scheme. A total of eight ϕ 2 mm side-drilled holes (SDH) and four inner surface slits with 3 mm height were manufactured at the different depths to simulate the volumetric and planar defects and related detection experiments were carried out. The results indicated that the twelve defects can be effectively detected with a measurement error within 6.9% in depth by using the proposed PAUT detection scheme.
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Keywords:
- BOSS weld /
- phased array ultrasonic testing /
- quantitative detection
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