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Electromagnetic acoustic emission non-destructive detection method and device of metal material

A metal material, non-destructive testing technology, applied in the direction of material magnetic variables, etc., can solve problems such as secondary damage, and achieve the effects of low price, expanded application scope, and simple structure of components

Inactive Publication Date: 2012-08-15
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an electromagnetic acoustic emission non-destructive detection method and device for metal materials, which is based on the direct loading of pulsed large currents, and realizes the non-destructive detection of crack-type defects in metal materials, which overcomes the existing technology in metal materials. The disadvantage of secondary damage to the metal material structure to be detected during the material detection process expands the application range of acoustic emission technology and improves its recognition efficiency, and is suitable for practical industrial applications

Method used

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  • Electromagnetic acoustic emission non-destructive detection method and device of metal material
  • Electromagnetic acoustic emission non-destructive detection method and device of metal material
  • Electromagnetic acoustic emission non-destructive detection method and device of metal material

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Experimental program
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Effect test

Embodiment 1

[0032] When starting the test, connect the pulse large current generator to 220v AC. When the charging voltage of the high-voltage capacitor C reaches 50V, the peak value of its discharge current can reach 800A, and the pulse width is 220 microseconds. Pass this pulse large current through 1.5 square meters The millimeter copper wire input is loaded on the aluminum metal material to be detected with a size of 500mm×115mm×15mm, and the aluminum metal material to be detected is excited to generate an acoustic emission signal, and the signal is placed on the aluminum metal material to be detected in a rhombus position The four piezoelectric sensors of R15a type on the board detect and input the preamplifier of American PAC company model 2 / 4 / 6 through the signal line, and the acoustic emission signal is amplified by the preamplifier and input to the PC. The collected acoustic emission signals are used for two-dimensional time-difference positioning, and the calculation steps are as...

Embodiment 2

[0037] In addition to starting the detection, connect the pulse large current generator to 220v AC. When the charging voltage of the high-voltage capacitor C reaches 50V, the peak value of the discharge current can reach 1860A, and the pulse width is 250 microseconds. The metal material to be detected is a size of Except for the alloy steel metal material of 500mm×115mm×15mm, the others are the same as in Embodiment 1.

[0038] Finally, the position of the crack-type defect in the alloy steel metal material to be detected was detected with a positioning error of 1mm.

Embodiment 3

[0040] In addition to starting the detection, connect the pulse large current generator to 220v alternating current. When the charging voltage of the high-voltage capacitor C reaches 50V, the peak value of the discharge current can reach 3000A, and the pulse width is 300 microseconds. The metal material to be detected is a size of Except for the alloy steel metal material of 500mm×115mm×15mm, the others are the same as in Embodiment 1.

[0041] Finally, the position of the crack-type defect in the alloy steel metal material to be detected was detected with a positioning error of 1mm.

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Abstract

The invention discloses an electromagnetic acoustic emission non-destructive detection method and device of a metal material, and relates to metal material testing by utilizing an acoustic wave emission technology. The detection method comprises the following steps of: loading pulse high current generated by a pulse high-current generator to a metal material to be detected, and exciting to generate acoustic emission signals if the metal material to be detected has cracks; detecting the acoustic emission signals by four piezoelectric sensors, inputting the acoustic emission signals into a preposed amplifier through a signal line, amplifying the acoustic emission signals by the preposed amplifier, and inputting into to a PC (personal computer) machine; and carrying out two-dimensional time difference positioning by the PC machine according to the collected acoustic emission signals, and positioning and detecting the cracking defect of the metal material to be detected. The device comprises the pulse high-current generator, four piezoelectric transducers, the preposed amplifier and the PC machine. According to the invention, the defect that the prior art in the metal material detection can lead to secondary destruction of the structure of the metal material to be detected is overcome, the application range of the acoustic emission technology is expanded, the recognition efficiency of the acoustic emission technology is improved, and the electromagnetic acoustic emission non-destructive detection method and device of the metal material are suitable for industrial application.

Description

technical field [0001] The technical solution of the invention relates to the testing of metal materials by means of acoustic wave emission technology, specifically the electromagnetic acoustic emission non-destructive testing method and device thereof for metal materials. Background technique [0002] With the rapid development of modern equipment manufacturing industry, the load-bearing stress level of metal components and equipment is continuously improved, and fracture failure accidents of metal components and equipment often occur. For important industrial fields such as aerospace, electric power, chemical industry, navigation and nuclear energy, fracture failure accidents of metal components and equipment often bring immeasurable and serious consequences. The traditional equipment maintenance method requires regular shutdown and maintenance of metal components and equipment, which is blind and brings a lot of inconvenience to production. In order to prevent the occurr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/82
Inventor 张闯刘素贞金亮杨庆新
Owner HEBEI UNIV OF TECH
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