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Ferromagnetic metal nondestructive testing method based on electromagnetic loading

A non-destructive testing and ferromagnetic technology, applied in the fields of magnetic variables of materials, analysis of solids using sonic/ultrasonic/infrasonic waves, and material analysis using sonic emission technology, which can solve problems such as difficulty in extracting materials and active state information.

Pending Publication Date: 2017-08-01
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a non-destructive detection method for defects and discontinuities on the surface or near the surface of ferromagnetic metal materials, which is an acoustic emission non-destructive detection method based on electromagnetic excitation, which overcomes the existing electromagnetic detection methods. Insufficient activity state information of material defects cannot be detected and the existing acoustic emission detection technology is difficult to extract weak signals of local defects in materials from the overall signal

Method used

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  • Ferromagnetic metal nondestructive testing method based on electromagnetic loading
  • Ferromagnetic metal nondestructive testing method based on electromagnetic loading
  • Ferromagnetic metal nondestructive testing method based on electromagnetic loading

Examples

Experimental program
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Effect test

Embodiment 1

[0028] At the beginning of detection, the 220v AC is rectified to achieve 190V DC output to the 190V DC terminal in the eddy current generator, and the signal generator in the eddy current generator outputs a control signal, which is input to the 190V DC power supply in the eddy current generator The power amplifier of the power amplifier, the power amplifier inverts the voltage into an AC voltage, and after the voltage is boosted by the transformer, the pulse square wave voltage is loaded on the loop composed of the resonant capacitor and the multi-turn exciting coil, and the pulse current passing through the coil Increase from the starting point to a certain amplitude, and induce a quasi-sinusoidal eddy current on the ferromagnetic metal to be detected with a size of 500mm×115mm×15mm. If there is a defect in the ferromagnetic metal to be detected, an acoustic emission signal will be excited. The emission signal is detected by four piezoelectric sensors S 1 , S 2 , S 3 and ...

Embodiment 2

[0033] Change the multi-turn coil excitation to EMAT excitation terminal excitation, and the others are the same as in embodiment 1.

[0034] The final positioning detects the defect position of the ferromagnetic metal material to be detected, and the positioning error is 1-2 mm, and finally determines the activity of the defect.

Embodiment 3

[0036] The vortex generator is replaced by a high-energy pulse transmitting and receiving device, and the others are the same as in Embodiment 1.

[0037] The final positioning detects the defect position of the ferromagnetic metal material to be detected, and the positioning error is 1-2 mm, and finally determines the activity of the defect.

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Abstract

The invention discloses a ferromagnetic metal nondestructive testing method based on electromagnetic loading. The testing method comprises the steps that a multiturn exciting coil where high-frequency and high-amplitude pulse current is electrified is utilized to guide vortex to the surface or the near surface of ferromagnetic material metal, increasing pulse current electrified on the coil to a certain amplitude from a beginning point and uploading the pulse current to the ferromagnetic metal to be detected; acoustic emission signals can be stimulated if the ferromagnetic metal to be detected has defects, magnetostrictive force and Lorentz force of a ferromagnetic material can be enhanced by externally adding a bias magnetic field, and amplitudes of the acoustic emission signals can be further enhanced; the acoustic emission signals are detected and collected by four piezoelectric sensors or EMAT receiving probes, are input into a front amplifier through a signal line to be amplified and then are input into a PC (personal computer); acoustic emission signal characters in different pulse currents are extracted according to the collected acoustic emission signals, and the acoustic emission signals and ultrasonic signals are distinguished according to a character change law; two-dimensional time difference location is performed, crack defects of the ferromagnetic metal to be detected can be located and detected, and finally defect activity is judged.

Description

technical field [0001] The technical solution of the present invention relates to the testing of metal materials using acoustic wave emission technology, specifically a non-destructive testing method for ferromagnetic metals based on electromagnetic loading Background technique [0002] Electromagnetic testing is an experimental method that uses the electrical and magnetic properties or material response characteristics (such as vibration characteristics, stress concentration characteristics or acoustic emission characteristics) of materials under electromagnetic action to judge the relevant performance and defects of materials, and can realize the detection of material defects. The non-contact non-destructive testing has the advantages of high sensitivity and fast detection speed, and has been widely used in manufacturing, aerospace, petrochemical and other industrial fields. In the prior art, methods for detecting material defects based on electromagnetic detection princip...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01N29/14G01N27/90
CPCG01N27/90G01N29/04G01N29/14
Inventor 金亮杨庆新郭富坤祝丽花邱运涛
Owner TIANJIN POLYTECHNIC UNIV
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