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Electromagnetic ultrasonic automatic flaw detection method for plates and device thereof

An electromagnetic ultrasonic and flaw detection device technology, which is applied to the analysis of solids using sonic/ultrasonic/infrasonic waves, which can solve problems such as being unfavorable for defect location, affecting flaw detection efficiency, and long magnetic field duration, achieving high detection accuracy and real-time performance. The effect of high efficiency and short magnetic field duration

Inactive Publication Date: 2010-05-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of the iron core, the magnetic field provided by the electromagnet lasts for a long time, which affects the efficiency of flaw detection
The presence of two flaw detection areas per probe is also not conducive to the localization of defects

Method used

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  • Electromagnetic ultrasonic automatic flaw detection method for plates and device thereof
  • Electromagnetic ultrasonic automatic flaw detection method for plates and device thereof
  • Electromagnetic ultrasonic automatic flaw detection method for plates and device thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Example 1, combining Figure 1 to Figure 6 , the present invention is an electromagnetic ultrasonic plate automatic flaw detection device, which is composed of a transmitter (1), a scanning system (2), a receiver (3), a data acquisition system (4) and an echo signal processing system (5) Yes, the transmitter (1) is connected to the scanning system (2), the scanning system (2) is connected to the receiver (3), the receiver (3) is connected to the data acquisition system (4), and the data acquisition system (4) is connected to the echo The signal processing system (5) and the echo signal processing system (5) are respectively connected to the scanning system (2) and the data acquisition system (4).

[0035] The present invention also has the following technical features:

[0036] The transmitter (1) includes a transmitter controller (6), a drive circuit (7), a boost circuit (8) and a power amplifier circuit (9), and the transmitter controller (6) is respectively connecte...

Embodiment 2

[0052] Example 2, combined Figure 7 , The electromagnetic ultrasonic plate automatic flaw detection method and device of the present invention adopts the vertical incident bulk wave to detect the plate. When there is no defect, there is only the echo of the bottom surface; when there is a defect, there are both the echo of the bottom surface and the echo of the defect. When detecting shallow defects, the defect echo will be submerged by the main impact, and at this time, the back surface echo will be attenuated greatly, so the back surface echo can be used to judge the presence or absence of shallow defects. Since electromagnetic ultrasonic technology does not require acoustic couplant or pretreatment of the test piece, the vertical incident bulk wave generated by the electromagnetic ultrasonic technology can be used for real-time online or in-service inspection of plates in various harsh environments.

Embodiment 3

[0053] Example 3, combined Figure 8 , the electromagnetic ultrasonic plate automatic flaw detection method and device of the present invention, the overall detection process of the plate to be tested (28): the scanning device is placed at the edge of one side of the plate to be tested (28), after the system is powered on and initialized, it starts to move at a constant speed along the edge At the same time, the pulse electromagnet inside the integrated electromagnetic ultrasonic probe starts to work, generating a strong magnetic field with a duration of 200μs, and the receiving analog switch is turned off. The high-power ultrasonic drive signal generated by the transmitter is applied to the double-spiral flaw detection coil, and the vertically incident bulk wave is excited in the plate (28) to be tested, and the emission repetition period is 10ms. Next, turn on the receive analog switch. The ultrasonic wave propagates in the plate to be tested (28), and will reflect, scatter...

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Abstract

The invention relates to an ultrasonic detection technique, in particular to an electromagnetic ultrasonic automatic flaw detection method for plates and a device thereof. In the invention, vertical incident waves are used for flaw detection and can detect plates with larger thickness. An electromagnetic ultrasonic flaw detection probe which is used by the invention uses a pulse electromagnet to provide a magnetic field, has the characteristic of short duration time of the magnetic field, and can efficiently detect ferromagnetic plates and nonferromagnetic plates. The invention combines the echo waves of a bottom surface and flaws, thereby reducing the detection blind area, and not only achieving higher sensitivity to the flaws but also accurately positioning the flaws. The invention uses the electromagnetic ultrasonic technique as a core and has no need of an acoustic coupling agent and no need of pretreatment on the surface of a test piece in the detection process, thus the invention can be used for on-line detection on plates in various severe environments (such as high temperature or high speed) and has stronger environmental suitability and higher detection efficiency.

Description

(1) Technical field [0001] The invention relates to ultrasonic detection technology, in particular to an electromagnetic ultrasonic plate automatic flaw detection method and a device thereof. (2) Background technology [0002] With the smooth development and maturity of projects such as manned spaceflight, lunar exploration projects, domestic large aircraft, aircraft carriers, and high-speed railways, the demand for metal sheets in my country has increased rapidly. However, due to the limitation of processing technology, defects such as delamination, slag inclusion, cracks and oxide films inevitably exist in the production process of metal sheets. As a necessary link to control product quality, non-destructive testing technology must be used in production to remove defective products that exceed the standard in time. Among many non-destructive testing techniques, ultrasonic testing has been widely used due to its low cost, wide testing range, and relatively high testing acc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
Inventor 王淑娟康磊宫佳鹏许霁邱玉段伟亮翟国富
Owner HARBIN INST OF TECH
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