CN114397358A - Eddy current detection method capable of displaying crack trend - Google Patents
Eddy current detection method capable of displaying crack trend Download PDFInfo
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- CN114397358A CN114397358A CN202111644630.9A CN202111644630A CN114397358A CN 114397358 A CN114397358 A CN 114397358A CN 202111644630 A CN202111644630 A CN 202111644630A CN 114397358 A CN114397358 A CN 114397358A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/904—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents with two or more sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9013—Arrangements for scanning
- G01N27/902—Arrangements for scanning by moving the sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9046—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents by analysing electrical signals
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Abstract
The invention relates to an eddy current testing method capable of displaying the trend of a crack, which is characterized in that the trend of the crack in a tested object is judged and displayed by utilizing two groups of coils in eddy current testing to detect acquired signals of different impedance plane diagrams and utilizing the marking property and the moving direction of a probe. The included angle between the crack and the advancing direction of the probe can be displayed in real time, and the operation difficulty of electromagnetic eddy current detection is simplified.
Description
Technical Field
The invention relates to the technical field of nondestructive testing, in particular to a method and a device for testing the trend of cracks of a metal material through eddy current testing, and particularly relates to an eddy current testing method capable of displaying the trend of cracks.
Background
Eddy current inspection is an ideal technology for detecting surface crack defects at the fastest speed, can be realized by only the minimum preparation work and a simpler inspection probe tool, is convenient to carry, and has the minimum damage to an object to be detected. The use of electromagnetic eddy current technology in the field of non-destructive inspection is limited by a number of subjective and objective factors, including the need to use complex scanning motions or to scan a component multiple times, and the understanding of vector map data generated by standard instrumental inspection.
In addition, in some field in-service detection environments, high temperature, stain, irregular shapes and the like of detection objects are detected, a high-precision sensor probe detection device is used, the damage is more, the cost is high, and the detection function and the accuracy of the simple coil type eddy current detection device are urgently needed to be improved by improving the analysis and calculation functions of software. Therefore, the simple and clear analysis result can make the electromagnetic eddy current test with high technical content in the profession more convenient and make the test result more obvious, which is a development direction for the eddy current test.
Aiming at the problems of the defects, the invention adopts the following technical scheme.
Disclosure of Invention
The invention aims to provide an eddy current testing method capable of displaying the trend of cracks, and the disclosed technical scheme is as follows:
the eddy current testing method capable of displaying the trend of the crack is characterized in that the trend of the crack in a tested object is judged and displayed by utilizing signals of different impedance plane diagrams obtained by two groups of coils in eddy current testing and utilizing the marking property and the moving direction Y of a probe, and the method comprises the following steps:
a. setting probe landmark direction X: setting a mark for the probe according to the coil structure direction in the probe, wherein the mark is used as a reference of the eddy current detection moving direction Y;
b. acquiring eddy current detection impedance plane map information: performing electromagnetic eddy current nondestructive testing on a metal material to be tested, and extracting impedance information of an electromagnetic eddy current testing probe sensor;
c. acquiring crack direction trend signal data: analyzing and calculating impedance plane graph signals, comparing corresponding parameter values, and judging to obtain crack direction trend data;
d. and (3) calculating and analyzing the vector angle direction of the crack direction: judging to obtain trend data of the crack direction by using the signal detection data of the impedance plane diagram, and obtaining a vector value of the trend of the crack direction by referring to the moving direction Y of the probe and the marking direction X of the probe;
f. the results show that: and taking the real-time specific moving direction of the probe mark as a coordinate direction, and displaying the trend of the crack on a coordinate screen of a detection and analysis instrument through a direction vector value. The operator of eddy current inspection can know the trend of the crack on the metal material to be inspected in the simplest and the fastest way.
Furthermore, the probe moving direction Y and the probe marking direction X are in the same direction, and the crack vector line direction displayed on the screen coordinates of the eddy current testing instrument is the actual crack direction with the probe moving direction Y as a reference. Like a mouse, the crack real direction is marked on the very vivid display, so that the detection personnel have dynamic and vivid detection experience.
Furthermore, the probe moving direction Y and the probe marking direction X form a certain included angle R, and the crack vector line direction displayed on the screen coordinates of the eddy current testing instrument is the actual crack direction with the probe marking direction X as a reference. The method is used for displaying included angles in different directions by rotating the probe when the detected metal part is inconvenient to move in one direction under the condition that the shape of the detected metal part is irregular, and is convenient for specific detection under the condition of special shapes of metal materials in severe environments.
And further, the method also comprises a method for displaying the depth of the crack, and the strength of the parameter signal is taken as the depth of the crack through the impedance data analysis of the eddy current detection signal, so that the deeper the crack, the longer the length of the displayed crack vector line, and the positive growth relationship is displayed. In the analytical calculation of the impedance signal parameter values of the eddy current test, the signal values are in a positive growth relationship with the crack depth.
Furthermore, the acquisition of the eddy current test impedance plane diagram information is to extract signal values of two coils which are vertically wound in the eddy current probe, the two coils which are vertically wound are set as one coil which transmits and receives the signal values of the other coil in a time-sharing manner, one coil transmits and receives the signal values at the same time, the other coil also transmits and receives the signal values at the same time, and after the high-frequency time-sharing test is performed to acquire the two test signal values, vector values of the two coils on different impedance plane diagrams are analyzed after superposition, so that the trend of the crack is determined. Because the magnetic flux vector values generated by the coil when transmitting and receiving at different angles are respectively maximum and minimum in the 90-degree included angle direction, the detection signal in any angle direction can not be missed.
Furthermore, the mutually perpendicular winding coils are set to extract detection signal values of the mutually perpendicular coils in a plurality of groups of mutually cross-wound coils for comprehensive comparison analysis. For example, the detection signals of two groups of four coils which form a cross winding in a shape of Chinese character 'mi', and every two coils are perpendicular to each other, the angle value of the generated signals is more comprehensive, and the detection signals without dead angles of 360 degrees can be detected.
Furthermore, the eddy current detection signal also comprises an eddy current signal which is extracted from the detection of the absolute eddy current detection coil and used as a compensation signal of the crack trend, and the error of the lift-off value of the eddy current detection on the detection information is compensated.
Furthermore, the absolute eddy current detection signal value is a signal value of an electromagnetic eddy current detection coil which is completely vertical to the detection surface and has the largest magnetic flux.
Furthermore, the absolute eddy current detection signal value is an electromagnetic eddy current detection signal value of an absolute coil additionally arranged besides the non-directional detection coil.
Furthermore, when the signal value of the probe scanning movement direction Y signal is extracted in step c, the index orientation information of the probe, that is, the index direction of the probe itself, is extracted as the longitudinal axial direction of the display direction on the screen of the detection instrument. The method is used for displaying included angles in different directions by rotating the probe when the detected metal part is inconvenient to move in one direction under the condition that the shape of the detected metal part is irregular, and is convenient for specific detection under the condition of special shapes of metal materials in severe environments.
According to the technical scheme, the invention has the following beneficial effects:
the invention relates to an eddy current testing method capable of displaying the trend of a crack, which is characterized in that the function of displaying the trend of the crack of an eddy current testing device is realized by carrying out vector analysis on an impedance plane diagram on an electromagnetic eddy current testing signal value, taking the symbolic moving direction Y as a reference and taking the actual moving direction Y of a probe as a reference for displaying, the included angle between the crack and the advancing direction of the probe can be displayed in real time, and the difficulty of electromagnetic eddy current testing operation is simplified;
in the eddy current detection method capable of displaying the crack trend, detection of 360-degree non-directional dead angles or blind areas of the detection probe is realized by extracting a plurality of groups of non-directional coil detection signals and different sending and receiving modes.
Thirdly, the extraction probe fixes a symbolic direction, and the symbolic direction is used as the axial direction for judging and displaying the crack direction of the electromagnetic eddy current detection instrument, so that the crack direction which is analyzed and judged can be converted into different directions to be displayed, and the method is suitable for extracting detection metal which is not standardized and is irregular in environmental materials to detect;
in the invention, an absolute eddy current test is used as a reference compensation value, and the eddy current detection coil has a lift-off compensation function, so that the functional effect of the eddy current detection device is greatly improved, and the lift-off compensation can realize nondestructive detection on the detected metal anticorrosive coating with uneven thickness.
Drawings
FIG. 1 is a schematic flow chart of a detection method according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of eddy current test signals in accordance with a preferred embodiment of the present invention;
FIG. 3 is a schematic diagram of eddy current test signals in accordance with a preferred embodiment of the present invention;
FIG. 4 is a schematic diagram of the eddy current test signal of the preferred embodiment of the present invention;
FIG. 5 is a schematic diagram of the eddy current test signal of the preferred embodiment of the present invention;
FIG. 6 is a schematic diagram of the eddy current test signal in accordance with the preferred embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
As shown in the flow chart of fig. 1, an eddy current inspection method capable of displaying crack trend is characterized in that the crack trend in an inspected object is judged and displayed by detecting acquired signals of different impedance plane graphs by using two groups of coils in eddy current inspection and by using probe marking and probe moving direction Y, and the method comprises the following specific steps:
as shown in fig. 2 to 5, an eddy current inspection method capable of displaying crack trend is characterized in that the crack trend in an inspected object is judged and displayed by detecting acquired signals of different impedance plane diagrams by two groups of coils in eddy current inspection and by utilizing probe marking and probe moving direction Y, and the method comprises the following specific steps:
a. setting probe landmark direction X: setting a mark for the probe according to the coil structure direction in the probe, wherein the mark is used as a reference of the eddy current detection moving direction Y;
b. acquiring eddy current detection impedance plane map information: performing electromagnetic eddy current nondestructive testing on a metal material to be tested, and extracting impedance information of an electromagnetic eddy current testing probe sensor;
c. acquiring crack direction trend signal data: analyzing and calculating impedance plane graph signals, comparing corresponding parameter values, and judging to obtain crack direction trend data;
d. and (3) calculating and analyzing the vector angle direction of the crack direction: judging to obtain trend data of the crack direction by using the signal detection data of the impedance plane diagram, and obtaining a vector value of the trend of the crack direction by referring to the moving direction Y of the probe and the marking direction X of the probe;
f. the results show that: and taking the real-time specific moving direction of the probe mark as a coordinate direction, and displaying the trend of the crack on a coordinate screen of a detection and analysis instrument through a direction vector value. The operator of eddy current inspection can know the trend of the crack on the metal material to be inspected in the simplest and the fastest way.
Furthermore, the probe moving direction Y and the probe marking direction X are in the same direction, and the crack vector line direction displayed on the screen coordinates of the eddy current testing instrument is the actual crack direction with the probe moving direction Y as a reference. Like a mouse, the crack real direction is marked on the very vivid display, so that the detection personnel have dynamic and vivid detection experience.
Furthermore, the probe moving direction Y and the probe marking direction X form a certain included angle R, and the crack vector line direction displayed on the screen coordinates of the eddy current testing instrument is the actual crack direction with the probe marking direction X as a reference. The method is used for displaying included angles in different directions by rotating the probe when the detected metal part is inconvenient to move in one direction under the condition that the shape of the detected metal part is irregular, and is convenient for specific detection under the condition of special shapes of metal materials in severe environments.
And further, the method also comprises a method for displaying the depth of the crack, and the strength of the parameter signal is taken as the depth of the crack through the impedance data analysis of the eddy current detection signal, so that the deeper the crack, the longer the length of the displayed crack vector line, and the positive growth relationship is displayed. In the analytical calculation of the impedance signal parameter values of the eddy current test, the signal values are in a positive growth relationship with the crack depth.
Furthermore, the acquisition of the eddy current test impedance plane diagram information is to extract signal values of two coils which are vertically wound in the eddy current probe, the two coils which are vertically wound are set as one coil which transmits and receives the signal values of the other coil in a time-sharing manner, one coil transmits and receives the signal values at the same time, the other coil also transmits and receives the signal values at the same time, and after the high-frequency time-sharing test is performed to acquire the two test signal values, vector values of the two coils on different impedance plane diagrams are analyzed after superposition, so that the trend of the crack is determined. Because the magnetic flux vector values generated by the coil when transmitting and receiving at different angles are respectively maximum and minimum in the 90-degree included angle direction, the detection signal in any angle direction can not be missed.
Furthermore, the mutually perpendicular winding coils are set to extract detection signal values of the mutually perpendicular coils in a plurality of groups of mutually cross-wound coils for comprehensive comparison analysis. For example, the detection signals of two groups of four coils which form a cross winding in a shape of Chinese character 'mi', and every two coils are perpendicular to each other, the angle value of the generated signals is more comprehensive, and the detection signals without dead angles of 360 degrees can be detected.
Furthermore, the eddy current detection signal also comprises an eddy current signal which is extracted from the detection of the absolute eddy current detection coil and used as a compensation signal of the crack trend, and the error of the lift-off value of the eddy current detection on the detection information is compensated.
Furthermore, the absolute eddy current detection signal value is a signal value of an electromagnetic eddy current detection coil which is completely vertical to the detection surface and has the largest magnetic flux.
Furthermore, the absolute eddy current detection signal value is an electromagnetic eddy current detection signal value of an absolute coil additionally arranged besides the non-directional detection coil.
As shown in fig. 6, when the signal data signal value of the probe scanning moving direction Y is extracted in step c, the index orientation information of the probe, that is, the index direction X of the probe itself, is extracted at the same time, and when the index orientation information is taken as the longitudinal axial direction of the display direction on the screen of the inspection instrument, that is, the displayed crack trend direction, the value of the included angle R between the index direction X and the crack direction is the same as the value of the included angle R between the crack signal direction and the longitudinal axial direction. The method is used for displaying included angles in different directions by rotating the probe when the detected metal part is inconvenient to move in one direction under the condition that the shape of the detected metal part is irregular, and is convenient for specific detection under the condition of special shapes of metal materials in severe environments.
The above is one embodiment of the present invention. Furthermore, it is to be understood that all equivalent or simple changes in the structure, features and principles described in the present patent concepts are included in the scope of the present patent.
Claims (10)
1. The eddy current testing method capable of displaying the trend of the crack is characterized in that the trend of the crack in a tested object is judged and displayed by utilizing two groups of coils in eddy current testing to detect obtained signals of different impedance plane diagrams and utilizing the marking property and the moving direction of a probe, and the method comprises the following steps:
a. setting the probe landmark direction: setting a mark for the probe according to the structural direction of a coil in the probe, wherein the mark is used as a reference for the movement direction of the eddy current test;
b. acquiring eddy current detection impedance plane map information: performing electromagnetic eddy current nondestructive testing on a metal material to be tested, and extracting impedance information of an electromagnetic eddy current testing probe sensor;
c. acquiring crack direction trend signal data: analyzing and calculating impedance plane graph signals, comparing corresponding parameter values, and judging to obtain crack direction trend data;
d. and (3) calculating and analyzing the vector angle direction of the crack direction: judging to obtain crack direction trend data by using impedance plane diagram signal detection data, and obtaining a vector value of the crack direction trend by referring to the moving direction of the probe and the marking direction of the probe;
f. the results show that: and taking the real-time specific moving direction of the probe mark as a coordinate direction, and displaying the trend of the crack on a coordinate screen of a detection and analysis instrument through a direction vector value.
2. An eddy current inspection method capable of displaying crack trend as claimed in claim 1, wherein the probe moving direction and the probe marking direction are in the same direction, and the crack vector line direction displayed on the screen coordinates of the eddy current inspection instrument is the actual crack direction with the probe moving direction as the reference.
3. An eddy current testing method capable of displaying the trend of a crack as claimed in claim 2, wherein the probe moving direction and the probe marking direction have a certain included angle R, and the direction of the crack vector line displayed on the screen coordinates of the eddy current testing instrument is the actual crack direction with the probe marking direction as a reference.
4. The method of claim 1, further comprising displaying the crack depth, wherein the crack depth is displayed by analyzing the impedance data of the eddy current test signal, and the strength of the parameter signal is used as the crack depth, and the deeper the crack, the longer the length of the crack vector line is, and the crack vector line is displayed in a positive growth relationship.
5. An eddy current testing method capable of displaying the crack trend as claimed in claim 1, wherein the obtaining of the eddy current testing impedance plane map information is to extract the signal values of two coils wound perpendicularly to each other in the eddy current probe, the two coils wound perpendicularly to each other are set to transmit from one coil to the other coil for reception, transmit from one coil for simultaneous reception and transmit from the other coil for simultaneous reception, and after obtaining the two testing signal values by high frequency time-sharing testing, the vector values of the two coils on different impedance plane maps are analyzed after superposition, thereby determining the crack trend.
6. An eddy current testing method capable of displaying crack trend according to claim 5, wherein the mutually perpendicular winding coils are configured to extract the detection signal values of the respective mutually perpendicular coils in the plurality of groups of mutually cross-wound coils for comprehensive comparison analysis.
7. An eddy current testing method capable of displaying the trend of cracks according to any one of claims 1 to 6, wherein the eddy current testing signal further comprises an eddy current signal detected by an absolute type eddy current detecting coil as a compensation signal for the trend of cracks, so as to compensate for the error of the lift-off value of the eddy current test on the testing information.
8. An eddy current testing method capable of indicating the trend of cracks according to claim 7, wherein the absolute eddy current testing signal value is the signal value of an electromagnetic eddy current testing coil which is perpendicular to the testing surface and has the largest magnetic flux.
9. An eddy current testing method capable of indicating the trend of cracks according to claim 7, wherein the absolute eddy current testing signal value is an electromagnetic eddy current testing signal value for an absolute coil additionally provided in addition to the non-directional detection coil.
10. An eddy current inspection method capable of displaying the trend of cracks according to claim 1, wherein the data signal value of the probe scanning moving direction is extracted in step c, and the marking orientation information of the probe, i.e. the marking direction of the probe itself, is extracted as the longitudinal axial direction of the display direction on the screen of the inspection apparatus.
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