Resonance eddy detection method for surface crack

A detection method and technology for surface cracks, applied in the direction of material magnetic variables, etc., can solve problems such as difficult surface crack detection, and achieve the effect of simple processing and easy design of portable detection instruments.

Inactive Publication Date: 2009-03-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the electromagnetic eddy current detection method, the conventional eddy current method, pulsed eddy current method, near-field eddy current, far-field eddy current, multi-frequency eddy current and other methods have also been developed. At present, it is difficult to use the general electromagnetic eddy current method to detect surface cracks. Other methods require the workpiece to be disassembled, thoroughly cleaned, and then inspected

Method used

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  • Resonance eddy detection method for surface crack
  • Resonance eddy detection method for surface crack
  • Resonance eddy detection method for surface crack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Detect crack width of 0.3mm, depth of 2mm, 1mm, 0.5mm standard eddy current testing crack samples

[0044] (2) The sensor probe sweeps across the crack at a speed of 0.5m / s, and the lift-off height is 2.5mm

[0045] (3) Obtain the detection data as shown in the table:

[0046]

Embodiment 2

[0048] (1) The detection crack width is 0.9mm-1.5mm continuous change, and the length is 150mm. The crack in the groove of the wheel hub is 2-3mm putty and anti-rust paint attached to the surface of the hub groove, and the surface is rough.

[0049] (2) The sensor probe sweeps across the crack at a speed of 2.5m / s, and the lift-off height is 4.5mm

[0050] (3) Obtain the detection data as shown in the table:

[0051]

Embodiment 3

[0053] (1) The detection crack width is 0.9mm-1.5mm continuous change, and the length is 150mm. The crack in the groove of the wheel hub is 2-3mm putty and anti-rust paint attached to the surface of the hub groove, and the surface is rough.

[0054] (2) The sensor probe sweeps across the crack at a speed of 1.5m / s, and the lift-off height is 6.5mm

[0055] (3) Obtain the detection data as shown in the table:

[0056]

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Abstract

This invention relates to crack resonance whorl testing method, which belongs to iron magnetic material lossless electro-magnetic testing field. This invention uses resonance circuit to generate pulse resonance signals to excite sensor ring to get whorl field to judge the crack existence through test ring. The advantage lies in improving extracting highness and overcomes the rough surface impact to realize spot test to fulfill traditional testing rough crack.

Description

technical field [0001] The invention relates to a non-destructive detection method for surface cracks, belonging to the technical field of non-destructive electromagnetic detection of ferromagnetic materials. Background technique [0002] Surface cracks have brought huge economic losses to modern industry, and accurate on-line detection has become a continuous industrial requirement. The existing surface crack detection technologies mainly include ultrasonic, magnetic powder, infiltration and electromagnetic methods; for the detection of surface cracks, ultrasonic testing has a wide range of objects, and various new materials such as composite materials, ceramic materials, etc., defect location is relatively accurate, but for The surface condition of the material to be tested has high requirements, and at the same time, a coupling agent is required between the measured object and the coupling state will greatly affect the results of ultrasonic testing; the coverage of the ul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/90
Inventor 李路明黄刚郝红伟
Owner TSINGHUA UNIV
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