PE管焊缝缺陷超声检测效果的模糊评价

Fuzzy evaluation of ultrasonic testing effect of PE pipe weld defect

针对聚乙烯管道运行过程中因存在缺陷而导致的安全风险,采用超声波技术检测聚乙烯管热熔焊接(特别是现场焊接)焊缝处的各种缺陷,并对缺陷的检测效果展开模糊评价。通过选用和制作不同类型的超声探头和PE管焊缝缺陷试块,分别采用5种定制探头检测及分析4种常见的PE管焊缝缺陷:气孔、夹杂、裂纹、脱层。在不同探头对各种类型缺陷的检出率和定量效果的基础上,利用模糊评价方法评估其检测效果,并验证其正确性。结果表明:不同类型探头对PE管缺陷检出率和定量效果差异明显,可通过选用适合的超声波探头检测PE管焊缝缺陷。

For the security risks caused by defects during polyethylene pipe operation, ultrasonic technology was used to inspect various defects in heat melting welds of polyethylene pipes （especially field welding）, and fuzzy evaluation was carried out for the effect of defect inspection. By selecting and manufacturing different types of ultrasonic probes and PE pipe weld defect test blocks, five kinds of customized probes were used to inspect and analyze four kinds of common weld defects of PE pipes： pore, inclusion, crack and delamination. Based on the relevance ratio and quantitative effect of various types of defects with different probes, the fuzzy evaluation method was used to evaluate the inspection results and verify its validity via tests. The results show that： by using different types of probes, the difference of relevance ratio and quantitative effect on PE pipe defects are very obvious, thus PE pipe weld defects can be inspected by using proper ultrasonic probes.