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Steel plate automatic detection method and apparatus thereof based on electromagnetical ultrasonic SH wave technology

An automatic detection device, electromagnetic ultrasonic technology, applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids, etc., can solve problems such as inability to effectively detect cracks and small defects, achieve high detection accuracy and real-time performance, strong environmental adaptability, detection full effect of results

Inactive Publication Date: 2011-05-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although vertical incident body waves are sensitive to delamination, inclusions and volume defects, they cannot effectively detect cracks and small defects

Method used

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  • Steel plate automatic detection method and apparatus thereof based on electromagnetical ultrasonic SH wave technology
  • Steel plate automatic detection method and apparatus thereof based on electromagnetical ultrasonic SH wave technology
  • Steel plate automatic detection method and apparatus thereof based on electromagnetical ultrasonic SH wave technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1, combining figure 1 , figure 2 , the use of electromagnetic ultrasonic technology can directly excite horizontally polarized shear waves in the steel plate under test, also known as SH waves (Shear Horizontal Wave). The dispersion characteristic of SH wave is simpler than that of Lamb wave, and SH wave is not easy to undergo mode conversion after being reflected by defects or end faces, and the received signal is pure, which is suitable for detecting the position and shape of various defects. In addition, since electromagnetic ultrasonic technology does not require acoustic coupling agents and pretreatment of specimens during detection, SH waves generated by electromagnetic ultrasonic technology can be used for on-line or in-service detection of medium and thin plates in various harsh environments.

[0036] In order to realize the electromagnetic ultrasonic automatic detection of medium and thin plates, the solution to the technical problem of the present...

Embodiment 2

[0037] Example 2, combined with image 3, the microprocessor periodically generates the SH wave control signal, and stimulates the transceiver integrated probe in the detection unit to generate the SH wave in the steel plate. Ultrasound propagates in the steel plate, and when it encounters a defect or an end face, it is reflected and scattered. The reflected signal and the transmitted signal can be received by the transceiver integrated probe and the transmitted wave receiving probe respectively. The steel plate automatic detection device based on the electromagnetic ultrasonic SH wave technology collects the received signal and processes the digital signal under the control of the microprocessor. The shape and position of the defect can be judged by comprehensively analyzing the reflection and transmission signals, and the detection results can be displayed in real time by the display circuit. In the present invention, the detection units are arranged in a combination of ho...

Embodiment 3

[0038] Example 3, combined with Figure 4 , Figure 5 , there are currently two options for generating SH waves. The first scheme is that the electromagnetic ultrasonic coil adopts a meander coil, and the static magnetic field is a horizontal magnetic field parallel to the coil. The excitation method is as follows: Figure 4 shown. Among them, the meandering coil is made of plexiglass skeleton, which greatly enhances the wear resistance of the probe. The wavelength of the excited SH wave is related to the turn spacing of the meander coil, if the wavelength of the SH wave is λ, then there is

[0039] λ=2l

[0040] In the formula, l——the turn spacing of the zigzag coil.

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Abstract

The aim of the invention is to provide a flaw detection technology for carrying out comprehensive, rapid and automatic detection on a median plate or a thin plate by electromagnetic ultrasonic horizontal polarization shearing wave, a steel sheet automatic detection method for rapidly and effectively detecting various disadvantages through an electromagnetic ultrasonic SH wave technology and a device thereof. The device consists of an electromagnetic ultrasonic detection unit and a circuit system. The method adopts SH wave to detect the median plate and the thin plate, is sensitive to the disadvantages of the surface and the inside of the steel plate, receives a pure signal and can effectively detect various disadvantages of the steel plate. As the SH wave has small attenuation during transmission, the SH wave has long detection distance, can realize the comprehensive detection of the steel plate with fewer probes and greatly improve the detection efficiency. The method combines an ultrasonic transmission method and a reflection method, can detect various disadvantages of the steel plate, can judge the shapes and positions of the disadvantages, and has high confidence level of a detection result.

Description

(1) Technical field [0001] The invention relates to ultrasonic detection technology, in particular to an automatic detection method and device for a steel plate using electromagnetic ultrasonic SH wave technology. (2) Background technology [0002] Plate-shaped components, especially medium and thin steel plates with a thickness of less than 16mm, are widely used in aerospace, automobile industry, shipbuilding industry, pressure boilers and pipelines. However, due to the defects brought in during the formation of the plate, such as delamination, inclusions, hole shape defects, cracks, etc., it will pose a threat to the safety of the component. At the same time, due to external loading and changes in the use environment of the plate, it may cause the expansion of its internal small defect source, and then cause fatigue failure accidents. [0003] At present, the ultrasonic flaw detection method is generally used for flaw detection of steel plates at home and abroad. Ultraso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04
Inventor 王淑娟康磊李智超蒋韬苏日亮梁轩瑞翟国富
Owner HARBIN INST OF TECH
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