聚乙烯燃气管道热熔焊缺陷微波无损检测系统研究  

Study on Microwave Detection System of Hot Melt Weld Defects in Polyethylene Gas-fired Pipeline

作　　者：赵番 ZHAO Fan(Shanghai Institute of Special Equipment Inspection and Technical Research,Shanghai 200062,China;Shanghai Pressure Pipeline Intelligent Inspection R&D Center,Shanghai 200062,China)

机构地区：[1]上海市特种设备监督检验技术研究院,上海200062 [2]上海压力管道智能检测工程技术研究中心,上海200062

出　　处：《石油化工设备》2024年第5期7-12,共6页Petro-Chemical Equipment

基　　金：上海市特种设备监督检验技术研究院科研项目:微波技术在PE管道检测中的应用研究(No.2024-04Y)。

摘　　要：针对聚乙烯燃气管道热熔焊接中的缺陷,使用微波技术进行了无损检测。热熔焊缝中的缺陷会使高分子聚乙烯材料晶体结构发生变化,进而引起介电常数变化。利用聚乙烯材料对微波的反射原理,从理论上推导出材料的介电常数变化会造成的微波反射波的幅值和相位变化,通过测量幅值和相位变化测量缺陷,可实现缺陷的定位和深度判别。设计并搭建了微波无损检测系统,对现场开挖出的带有缺陷的管道热熔焊缝进行了周向和轴向检测,将微波检测结果与数字射线试验结果进行了对比验证,证实了微波无损检测对热熔接头缺陷具有突出的检测能力。Aiming to identify defects in the hot melt welding of polyethylene gas-fired pipelines,non-destructive testing was conducted using microwave technology.The defects in the hot melt weld will result in a change to the crystal structure of the polymer polyethylene material,which will subsequently affect the dielectric constant.The amplitude and phase changes of the reflected microwave waves,which are caused by the change in dielectric constant of the material,are deduced theoretically based on the principle of microwave reflection in polyethylene pipelines.By measuring the amplitude and phase changes,it is possible to identify the location and depth of defects.A microwave nondestructive testing system was constructed and utilized to perform circumferential and axial tests on hot melt welds excavated from the field with defects.The digital ray test was employed to validate the microwave detection.The results demonstrated that microwave nondestructive testing exhibited remarkable capabilities for the detection of defects in hot melt joints.

关 键 词：管道 热熔焊 缺陷 检测 方法 装置 微波 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]