Quantizing method for detecting corrosion defect by magnetic leakage

Abstract

The invention is a quantizing method for detecting corrosive defect by using magnetic leakage. The invention uses the distribution property of the detected leakage magnetic field to implement quantizing corrosive defect size according to a specified algorithm. The concretely implementing method: firstly making a sample with three series of standard defects, according to the leakage magnetic detected data, determining the length, width and coefficient in deep quantizing method, thus obtaining a corrosive defect quantizing method and providing a basis for evaluating using state of equipment and equipment maintenance. The invention effectively overcomes the disadvantage of being difficult to quantize corrosive defect and defect depth in existing techniques, and the method of the invention is simple and easy to apply and able to be implemented, manually and by computer, high-efficiency and having a wider application prospect.

Description

technical field [0001] The invention relates to a data analysis and processing method for magnetic flux leakage detection of corrosion defects, in particular to a quantification method for corrosion defects of magnetic flux leakage detection, and belongs to the technical field of nondestructive detection. Background technique [0002] Magnetic flux leakage testing is a commonly used non-destructive testing method and has important applications in pressure vessels, pressure pipelines and other safety fields. However, for a long time, how to use the magnetic flux leakage testing data to judge the defect size of the tested parts has always been a problem. The method of manually analyzing magnetic flux leakage testing data to judge defects is usually used, which is often based on experience, which is inefficient and difficult to quantify. [0003] Chinese patent literature discloses a "analysis method for magnetic flux leakage detection data of pipeline defects" (publication num...

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Problems solved by technology

[0002] Magnetic flux leakage testing is a commonly used non-destructive testing method, which has important applications in pressure vessels, pressure pipelines and other safety fields. However, for a long time, how to use the magnetic flux leakage testing data to judge the defect size of the tested parts has always been a difficult problem

Usually, the method of manually analyzing the data of magnetic flux leakage detection to judge defects is often based on experience, which is inefficient and difficult to quantify

[0003] Chinese patent literature discloses a "analysis method for magnetic flux leakage detection data of pipeline defects" (publication number: 1458442, publication date: 2003.11.26), which involves a method that can improve the analysis efficiency and The data analysis and processing method of magnetic flux leakage detection for pipeline defects with quantitative analysis accuracy can judge whether there are defects in the pipeline by displaying the cloud image of the data, but this technology has the disadvantage of difficult quantification, especially the depth of corrosion defects.

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