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
CN102435667AInactive Publication Date: 2012-05-02WUHAN TEXTILE UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
WUHAN TEXTILE UNIV
Publication Date
2012-05-02
Estimated Expiration
Not applicable Β· inactive patent

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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.
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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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