Circular dual-frequency excitation eddy current probe and method for detecting thick-wall deep crack defects

A technology of eddy current probes and detection probes, applied in the direction of material magnetic variables, etc., can solve the problems of difficult detection signal resolution, low probe resolution, low detection speed, etc., achieve high detection efficiency, improve detection depth, and increase signal-to-noise ratio Effect

Pending Publication Date: 2018-07-31
BEIFANG UNIV OF NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with existing technologies such as single frequency (low frequency excitation) and the use of magnetic sensitive elements, the present invention can effectively solve the problems of low probe resolution, decreased sensitivity, low detection speed, and difficult resolution of detection signals, and can be used for deep cracks in thick-walled components Large batches of high-speed detection of defects provide accurate and reliable judgment basis for the detection and evaluation of thick-walled deep crack defects in industrial practice

Method used

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  • Circular dual-frequency excitation eddy current probe and method for detecting thick-wall deep crack defects
  • Circular dual-frequency excitation eddy current probe and method for detecting thick-wall deep crack defects
  • Circular dual-frequency excitation eddy current probe and method for detecting thick-wall deep crack defects

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] like figure 1 As shown, a dual-frequency excitation circular eddy current probe for detecting thick-walled deep crack defects is characterized in that: it includes an excitation probe assembly, a detection probe assembly and a fixing frame; the excitation probe assembly has two groups, and the detection probe assembly is The center is distributed symmetrically from left to right; each group of the excitation probe assembly is composed of an excitation coil 1 and a corresponding excitation coil installation column 2, and the excitation coil 1 is set on the excitation coil installation column 2; the detection probe The assembly is composed of a detection coil 3 and a detection coil installation column 4, and the detection coil 3 is set on the detection coil installation column 4; the fixing frame is composed of a column fixing plate 5 and a scanning component connector 6, and the column The fixing plate 5 is fixedly connected with the connecting piece 6 of the scanning co...

Embodiment 2

[0059] like figure 2 As shown, on the basis of Embodiment 1, a method for detecting thick-walled deep crack defects with a dual-frequency excitation circular eddy current detection probe is characterized in that it includes the following steps:

[0060] S1. Through the synchronous AC power supply 9, the steady-state sinusoidal excitation currents with different frequencies and sizes are continuously fed to the two groups of excitation coils 1, and the sinusoidal excitation currents generate eddy current fields in the flat metal test piece 13;

[0061] S2. Through the scanning console, the detection probe assembly is C-scanned on the surface of the test piece 13, the eddy current field at the defect is disturbed by the defect, and the defect information is fed back to the detection coil 3 through the disturbance magnetic field;

[0062] S3. Input the detection signal in the detection coil 3 into the filter 10, and utilize the filter 10 to filter out the high-frequency noise wh...

Embodiment 3

[0066] In order to verify that the penetration depth of the dual-frequency excitation circular eddy current detection probe is better than that of the corresponding single-frequency excitation probe when detecting thick-walled deep crack defects, on the basis of Example 2, two excitation frequencies of 5kHz and 20kHz were used to conduct single-frequency Contrastive experiments of the penetration depth of the excited eddy current probe and the dual frequency excited eddy current probe.

[0067] 1. When using a dual-frequency excitation circular eddy current detection probe for experiments, input a current of 5 kHz and 1.3 A into the excitation coil 1 located on the left side of the detection coil 3, and input a current of 20 kHz and 1.3 A into the excitation coil 1 located on the right side of the detection coil 3. 0.7A current; the configuration parameters, detection methods and results of the dual-frequency excitation eddy current probe are as follows:

[0068] 1) Configurat...

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Abstract

The invention belongs to the technical field of nondestructive testing, and relates to a circular dual-frequency excitation eddy current probe and a method for detecting thick-wall deep crack defects.The circular dual-frequency excitation eddy current probe comprises dual-frequency excitation probe assemblies, a detection probe assembly and a fixing frame; two sets of excitation probe assembliesare provided, and are distributed in bilateral symmetry with the detection probe assembly as a center; each excitation probe assembly consists of an excitation coil and a excitation coil mounting vertical column; the detection probe assembly consists of a detection coil and a detection coil mounting vertical column; the fixing frame consists of a vertical column fixing plate and a scanning component connecting component which are fixedly connected; the bottom end of the excitation coil mounting vertical column and the bottom end of the detection coil mounting vertical column are mounted on thevertical column fixing plate; the excitation coil is a circular eddy current coil and is excited by adopting a sinusoidal dual-frequency AC current. After adoption of the circular dual-frequency excitation eddy current probe, the penetration depth of an eddy current and the deep crack detecting ability of the probe can be improved, and the penetration depth of the circular dual-frequency excitation eddy current probe can reach about 21mm.

Description

technical field [0001] The invention belongs to the technical field of nondestructive testing, and relates to an eddy current probe used for industrial detection of defects, in particular to a dual-frequency excitation circular eddy current probe and a method for detecting thick-walled deep crack defects. Background technique [0002] Eddy current testing is one of the conventional non-destructive testing technologies. It is based on the principle of electromagnetic induction and is an electromagnetic testing method for defect detection and performance testing of materials and components based on the change of electromagnetic properties of materials. The basic principle is based on the theory of electromagnetics. of. The eddy current testing method has the advantages of non-contact, fast detection speed and shallow crack quantification, and is an effective method for quantitative non-destructive evaluation of structural surface and near-surface defects. Eddy current on-line...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/90
CPCG01N27/9006
Inventor 张东利王闯龙武美先
Owner BEIFANG UNIV OF NATITIES
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