金属保护层对脉冲涡流检测影响实验研究
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1.天津市特种设备监督检验技术研究院 天津 300192; 2.国家市场监管重点实验室(特种设备数字孪生共性技术) 天津 300192; 3.天津农学院 天津 300384

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TN98

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天津市科技支撑重点项目(20YFZCGX00480)、天津市市场监督管理委员会科技计划项目(2021-W01)、天津市市场监督管理委员会科技计划项目(2021-W24)、国家市场监督管理总局科技计划项目(2022MK011)资助


Experimental study on the influence of metal protective layer on pulsed eddy current testing
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1.Tianjin Special Equipment Inspection Institute,Tianjin 300192, China; 2.Key Laboratory of Digital Twin Generic Technology in Special Equipment for State Market Regulation,Tianjin 300192, China; 3.Tianjin Agricultural University,Tianjin 300384, China

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    摘要:

    石化设备为保温会包裹一层由隔热层与金属保护层组成的包覆层,应用脉冲涡流检测技术可实现不拆包覆层条件下设备的壁厚检测。但在实际检测中由于金属保护层材质与厚度不一致,会对检测结果与检测误差产生影响。本文搭建了脉冲涡流实验平台,分析不同类型、厚度金属保护层在不同隔热层厚度下对脉冲涡流检测信号影响,结果表明:当金属保护层为铝板与不锈钢板时,其厚度或隔热层厚度增加会增大特征值离散程度,但不影响特征曲线趋势,可通过特征曲线计算被测试件厚度;当金属保护层为镀锌钢板时,其高磁导率特性产生的屏蔽效应与感生涡流会对检测信号衰减及特征曲线产生影响。随着镀锌钢板厚度增加,不同厚度试件检测信号后期衰减差异越小。当隔热层厚度增大到50 mm时,检测信号基本重合,无法通过特征曲线计算被测试件厚度。

    Abstract:

    Petrochemical equipment always coated with a coating composed of thermal insulation layer and metal protective layer for thermal insulation. The application of pulsed eddy current testing technology can realize the wall thickness detection without removing the coating. However, in actual testing, the material and thickness of the metal protective layer are inconsistent, which will affect the testing results and testing errors. In this paper, a pulsed eddy current experiment platform was built to analyze the impact of different types and thicknesses of metal protective layers on the pulsed eddy current testing signal under different insulation layer thicknesses. The results show that when the metal protective layers are aluminum and stainless steel plates, the increase in their thickness or insulation layer thickness will increase the dispersion of characteristic values, but will not affect the trend of characteristic curves. The thickness of the tested part can be calculated through the characteristic curves; when the metal protective layer is galvanized steel plate, the shielding effect and induced eddy current generated by its high magnetic permeability characteristics will affect the detection signal and characteristic curve. With the increase of the thickness of the galvanized steel plate, the difference of the late attenuation of the detection signal of the specimens with different thicknesses is smaller. When the thickness of the insulation layer increases to 50 mm, the detection signals are basically coincident, and the thickness of the tested piece cannot be calculated through the characteristic curve.

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李超月,王璇,牛卫飞,高鹏,贺柏达.金属保护层对脉冲涡流检测影响实验研究[J].电子测量技术,2023,46(14):24-

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  • 在线发布日期: 2024-01-18
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