压力容器焊缝TOFD检测的关键影响因素研究

Research on Key Influencing Factors of Pressure Vessel Weld TOFD Inspection

在TOFD技术工程应用实际问题调研的基础上,阐述了压力容器焊缝TOFD检测关键影响因素研究的必要性。从“人、机、料、法、环、测”等六方面入手,梳理出了检测仪器系统故障、操作指导书不完善、相邻区域交叉作业、现行标准无采图说明、探头移动区表面粗糙度过低、扫查器与工件曲率不匹配、探头线路虚连、培训不到位等8个方面的末端因素。调查分析和试验研究表明,“操作指导书不完善”“相邻区域交叉作业”“扫查器与工件曲率差异”等三个因素是影响超声TOFD技术在焊缝检测中的关键因素。为下一步提升检测质量和效率提出了三条建议,对显著提升检测质量具有重要的应用价值和指导意义。

Based on the investigation of practical engineering application of TOFD technology,the necessity of research on the key influencing factors of TOFD inspection for pressure vessel welds is expounded. Starting from six aspects of “man,machine,material,law,environment and measurement”,the end factors in 8 aspects such as malfunction of testing instrument system,imperfect operation instruction,cross operation in adjacent area,no drawing description in current standard,too low surface roughness of probe moving area,mismatching of scanner and workpiece curvature,virtual connection of probe circuit,inadequate training,etc. are summarized. Through investigation,analysis and experimental study,it is shown that three factors are the key factors influencing the application of TOFD technology in weld inspection,these are,“imperfect operation instruction”,“cross operation in adjacent area”and “curvature difference between scanner and workpiece”. Three suggestions are put forward to improve the quality and efficiency of detection,which is of great value and guidance to improve the detection quality.