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Quantizing method for detecting corrosion defect by magnetic leakage

A technology of magnetic flux leakage detection and quantification method, which is applied in the direction of measuring device, material magnetic variable, and electromagnetic means, etc. It can solve the problems of difficult quantification of corrosion defect depth, quantification difficulty, and difficult quantification. The method is simple and easy to implement, Broad application prospects and high efficiency

Inactive Publication Date: 2005-07-20
TSINGHUA UNIV
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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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  • Quantizing method for detecting corrosion defect by magnetic leakage
  • Quantizing method for detecting corrosion defect by magnetic leakage
  • Quantizing method for detecting corrosion defect by magnetic leakage

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Embodiment Construction

[0018] The content of the present invention can be further understood through specific examples below.

[0019] Use a pipeline magnetic flux leakage detector MT1 with 300 detection probes evenly distributed along the circumferential direction to detect the pipeline to be tested with a diameter of 273mm and a wall thickness of 10mm. The sampling interval to each probe is 2.86mm, and the distance between the detection probe and the surface of the tested sample is 3mm.

[0020] Before detecting pipeline corrosion defects, a standard defect detection experiment is carried out first. That is, take a standard pipe with a diameter of 273mm, a wall thickness of 10mm and the same material as the pipe to be tested, and process lengths on it of 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm and 100mm , width is 30mm, depth is 2mm; length is 30mm, width is 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm and 100mm, depth is 2mm; length and width are both 30mm, depth is 3 serie...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/00G01M3/00G01N27/82
Inventor 黄松岭赵伟崔伟吴静王珅
Owner TSINGHUA UNIV
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