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Electromagnetic detection method for metal flaw

An electromagnetic detection and detection method technology, applied in the direction of material magnetic variables, etc., can solve the problems such as complexity and stability limit the application development of crack detection technology, inability to meet, detection accuracy and measurement depth influence, etc., to achieve good consistency and accuracy High performance and broad application prospects

Inactive Publication Date: 2012-05-02
WUHAN TEXTILE UNIV
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Problems solved by technology

[0002] At present, in the detection of metal structure cracks in metal materials and mechanical equipment used in various construction projects, ultrasonic flaw detection technology and AC and DC current flaw detection technology are generally used. The detection accuracy and measurement depth are affected by various effects, and cannot meet certain requirements Inspection requirements; its complexity and stability also limit the application and development of crack detection technology

Method used

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  • Electromagnetic detection method for metal flaw
  • Electromagnetic detection method for metal flaw

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Embodiment Construction

[0010] During the detection process, the combination of the E-shaped magnet 1 and the primary and secondary coils 2 and 3 is closely attached to the surface of the metal material, and the end surface of the magnet is kept in smooth and good contact with the measured part. Before testing, carry out zero point calibration: that is, to conduct a test on the same intact material to obtain the reference parameters. During the measurement, the same installation is carried out on the relevant parts of the metal material to be tested, and the voltage of the same parameter is added, and the corresponding voltage is induced by the secondary coil 3, and then processed by the detection circuit and calculation program, it automatically displays whether there is a crack. If there are cracks, the distribution, size and depth of the cracks can be determined by adjusting the change of the magnetic core bolts.

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Abstract

The invention discloses an automatic detection method for the flaw of a metal material such as a metal sheet, a bar, a structural section, a tubular product, an angle iron, an iron rail and the like. A detector comprises a magnetic core 1, a primary coil 2, a secondary coil 3, a driving circuit and a detection circuit. When a specific driving voltage is added into the primary coil 2, a closed magnetic field can be generated in a continuous magnetic circuit which is formed by the magnetic core 1 and a metal body 4 to be detected; and when a metal flaw is detected, the parameter of the magnetic field can be changed, the change quantity of the parameter can be transmitted to the detection circuit and a calculation program by induction voltage generated by the secondary coil 3 to be processed, and the relevant parameters of the metal flaw to be detected can be exactly obtained in cooperation with the adjustment of a magnetic core screw bolt 6.

Description

Technical field: [0001] The invention relates to a metal crack detection technology based on the electromagnetic field boundary value, which is suitable for the detection of stress damage, impact resistance and fatigue resistance of engineering metal materials such as bridges, railways, buildings and pipelines. Background technique: [0002] At present, in the detection of metal structure cracks in metal materials and mechanical equipment used in various construction projects, ultrasonic flaw detection technology and AC and DC current flaw detection technology are generally used. The detection accuracy and measurement depth are affected by various effects, and cannot meet certain requirements Detection requirements; its complexity and stability also limit the application and development of crack detection technology. Invention content: [0003] The technical problem to be solved by the present invention is: an electromagnetic detection method using the distortion of the ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/82
Inventor 陶桓齐
Owner WUHAN TEXTILE UNIV
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