Defect detection method based on ferromagnetic plate

A defect detection and detection method technology, which is applied in the direction of material magnetic variables, can solve the problems of large mechanical noise and wear of magnetic sensors, and achieve the effects of enhanced wear resistance, enhanced leakage magnetic field, and high sensitivity

Active Publication Date: 2021-12-10
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0003] However, in the magnetic flux leakage detection, when the lift-off value of the magnetic sensor is large, the magnetic flux leakage signal will be very weak, and when the lift-off value of the magnetic sensor is small, the magnetic sensor may be severely worn, and the low lift-off value High mechanical noise due to sensor vibration

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  • Defect detection method based on ferromagnetic plate
  • Defect detection method based on ferromagnetic plate
  • Defect detection method based on ferromagnetic plate

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Embodiment Construction

[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0030] see figure 1 , figure 2 and image 3 , the defect detection method based on the ferromagnetic plate provided by the present invention mainly comprises the following steps:

[0031] In step 1, a magnetizer is used to magnetize the workpiece to be tested, so that defects on the workpiece to be tested generate leakage magnetic fields.

[0032] Specifically, the magnetizer used when the ...

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Abstract

The invention belongs to the related technical field of electromagnetic nondestructive testing, and discloses a defect detection method based on a ferromagnetic plate. The detection method comprises the following steps that: (1) a magnetic sensor is fixed on a ferromagnetic plate, wherein a through groove is formed in the ferromagnetic plate, the through groove penetrates through the ferromagnetic plate in the thickness direction of the ferromagnetic plate, and the through groove penetrates through the area, covered by the magnetic sensor, of the ferromagnetic plate; and (2) in a magnetizing field, defect scanning is performed on a magnetized workpiece to be detected by the magnetic sensor and the ferromagnetic plate, wherein a leakage magnetic field generated by the through groove under the action of the magnetizing field and a leakage magnetic field generated by a defect on the workpiece to be detected are mutually magnetized and enhanced. According to the invention, shaking is avoided, the wear resistance of the magnetic sensor is enhanced, on the other hand, the magnetic flux leakage detection signal is enhanced, and the magnetic flux leakage detection sensitivity is improved.

Description

technical field [0001] The invention belongs to the technical field related to electromagnetic nondestructive testing, and more specifically relates to a defect detection method based on a ferromagnetic plate. Background technique [0002] Non-destructive testing technology is a non-destructive testing technology based on electromagnetic induction. With the development of electronic technology and computer technology, electromagnetic non-destructive testing technology has made breakthroughs in development and application. Among them, magnetic flux leakage testing is widely used in non-destructive testing of ferromagnetic materials. . The embodiment usually magnetizes the workpiece by an electromagnet or a permanent magnet. The defect on the workpiece disturbs the magnetic field, thereby generating a leakage magnetic field in the air above the defect. The magnetic sensor is used to scan the workpiece to sense the existence of the leakage field. Then determine the existence o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/83
CPCG01N27/83
Inventor 康宜华唐健
Owner HUAZHONG UNIV OF SCI & TECH
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