CN114397360A - Eddy current detection method and detection device for weld crack trend - Google Patents
Eddy current detection method and detection device for weld crack trend Download PDFInfo
- Publication number
- CN114397360A CN114397360A CN202111650252.5A CN202111650252A CN114397360A CN 114397360 A CN114397360 A CN 114397360A CN 202111650252 A CN202111650252 A CN 202111650252A CN 114397360 A CN114397360 A CN 114397360A
- Authority
- CN
- China
- Prior art keywords
- eddy current
- crack
- current detection
- coils
- detection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention relates to an eddy current testing method and a testing device for the crack trend of a welding seam, which are used for a testing, analyzing, calculating and judging method for the crack trend in electromagnetic eddy current nondestructive testing of a metal material welding seam. The crack trend display function of the eddy current detection device is achieved through comparison calculation and analysis of the detection instrument.
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 by eddy current, and particularly relates to an eddy current testing method and a testing device for the trend of cracks of a welding seam.
Background
In nondestructive detection of welding seams, the most convenient and simple method is the electromagnetic eddy current technology, no matter ferromagnetic or non-ferromagnetic materials. Since such many welds in modern society are performed manually, the weld surface condition is conceivable. Although the current array electromagnetic eddy current imaging method is relatively mature, due to the existence of lift-off effect, the diversity of defects and the nonuniformity of the weld surface, it is not practical to completely rely on the array eddy current detection imaging technology, especially the special-shaped weld structure such as diagonal weld. Therefore, a single electromagnetic eddy current detection sensor is an unfortunate choice for such current operating conditions. However, the currently adopted single-probe detection mode has low work efficiency, cannot sense the trend of the crack, and can only be distinguished through multiple searching and comparison, so that new solutions and solutions need to be provided.
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.
Aiming at the problems of the defects, the invention adopts the following technical scheme.
Disclosure of Invention
The invention aims to provide a welding seam crack trend eddy current testing method and a welding seam crack trend eddy current testing device, and the technical scheme is as follows:
the eddy current detection method for the crack trend of the welding seam is used for detecting, analyzing, calculating and judging the crack trend in electromagnetic eddy current nondestructive detection of the welding seam of a metal material, and is characterized in that the crack trend in the detected welding seam is judged by utilizing different impedance plane diagram signals obtained by detecting two groups of coils in eddy current detection and comparing, analyzing and calculating an included angle between the crack direction and the advancing direction of a probe, wherein the specific method comprises the following steps:
a. electromagnetic eddy current nondestructive testing: scanning and detecting the metal material to be detected by using an eddy current detection device;
b. detection signal impedance signal extraction: extracting impedance plane graph signals in two coil detection signal values;
c. analyzing the impedance plane diagram: analyzing and calculating different impedance plane vector values in two coils of a group of eddy current detection coils, and analyzing the crack direction of the coils corresponding to the angle and the data change condition;
d. extracting the scanning direction of the detection device: comparing and analyzing the movement direction of the eddy current detection device in the eddy current detection signal value;
f. analyzing and judging the trend of the cracks: and calculating the crack direction in the eddy current detection signal according to the change parameters of the impedance plane graph, comparing and analyzing the crack direction with the scanning direction of the detection device to obtain an included angle between the crack direction and the detection device, and judging the crack trend in the detected weld joint.
And b, extracting the impedance information of the detection signals in the step b, and selectively extracting the detection signals of a pair of eddy current detection coils with smaller extraction values of the eddy current detection signals as objects of selective analysis.
Furthermore, the two groups of eddy current detection coils are impedance plane graph information of the two groups of detection coils which are wound mutually and vertically.
Further, the method also comprises the step of taking an eddy current signal detected by the absolute eddy current detection coil as a compensation signal of the crack trend to compensate the influence of the lift-off value of the eddy current detection on the detection information.
Further, the absolute eddy current detecting coils are provided at front and rear end positions in the moving direction of the detecting device, and correct the influence of the adhesion detection surface when the detecting device moves.
The invention also discloses an eddy current testing device capable of displaying the trend of the crack, which is used for detecting the trend of the crack in the electromagnetic eddy current nondestructive testing of the welding seam of the metal material, wherein the eddy current testing device (10) is connected with a detection analysis instrument (12) through a lead (11) and comprises a probe main body (13), a first eddy current testing coil (101) and a second eddy current testing coil (102), and the eddy current testing device is characterized in that in eddy current testing signals obtained by the detection of two groups of eddy current testing coils (101, 102) in the eddy current testing device, different impedance plane diagram signals of the two groups of coils are analyzed, and the included angle between the crack direction and the advancing direction of the probe is calculated by means of comparative analysis, so as to determine the trend of the crack in the detected welding seam.
The probe body (13) is of a cylindrical structure, and the first eddy current detection coil (101) and the second eddy current detection coil (102) are provided with square coils wound on the axial direction of the probe body (13) of the cylindrical structure.
Further, the first eddy current detection coil (101) and the second eddy current detection coil (102) are arranged to be perpendicular to each other.
Furthermore, a plurality of groups of crossed eddy current detection coils (101a, 102a; 101b, 102b; 101c, 102 c) are wound and arranged on a probe body (13) of the eddy current testing device (10) in the radial direction, or a plurality of eddy current detection coils (103a,103b,103c) are wound and arranged in the axial direction, and the crack trend in the tested welding seam is determined by selectively comparing the plane impedance diagram of the testing data of any two corresponding eddy current detection coils and analyzing and calculating the included angle between the crack direction and the probe advancing direction.
Further, the eddy current inspection apparatus (10) further includes an absolute type eddy current detection coil (103a,103b,103c) selected to be wound in a radial direction around an end portion of the probe body (13). The absolute eddy current detection coil can also be arranged to comprise a group of two absolute coils (103a,103 b) which are radially wound at two end parts of the end part of the probe body (13), and the two absolute coils are arranged at the front end and the rear end of the moving direction of the detection device to compare and calibrate the fitting degree of the eddy current device (10) and the detection surface, namely, the balance compensation lift-off value.
According to the technical scheme, the invention has the following beneficial effects:
the invention relates to an eddy current detection method for the crack trend of a welding seam, which is characterized in that different impedance plane diagram signals obtained by two groups of coils are utilized to obtain the included angle between the crack direction and the advancing direction of a probe, the crack trend information of the crack is given, a simple eddy current detection coil is utilized, the function of displaying the crack trend of an eddy current detection device is realized through the comparison calculation analysis of a detection instrument, the included angle between the crack and the advancing direction of the probe can be displayed in real time, and the prejudgment time for the crack trend is greatly shortened;
in the eddy current detection method and the detection device for the crack trend of the weld joint, a plurality of groups of differential coils are arranged, the differential coils are concentrically and axially wound on the outer side of a main body of the detection device, detection signals of one pair of coils can be selectively selected as analysis objects, the accuracy and the sensitivity of detection information are improved, and the method and the device are particularly suitable for in-service detection of a welding part of a metal material and are suitable for irregular weld joint detection of non-standardized and environmental materials;
in the invention, the absolute eddy current detection coil is radially wound on the detection main body and is completely vertical to the detection surface, the maximum magnetic flux of the absolute eddy current detection coil can be ensured, the absolute eddy current detection coil has a lifting-off compensation function, the function effect of the eddy current detection device is greatly improved, the lifting-off compensation can realize nondestructive detection on the original welding seam anticorrosive coating with uneven thickness, and the thickness value is displayed.
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 view of a detecting device according to a preferred embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a detecting device according to a preferred embodiment of the present invention;
FIG. 5 is a schematic structural diagram of another detecting device according to the preferred embodiment of the present invention;
FIG. 6 is a schematic structural diagram of another detecting device according to 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 a flow chart in FIG. 1, an eddy current testing method for the crack trend of a weld joint is used for detecting, analyzing, calculating and judging the crack trend in electromagnetic eddy current nondestructive testing of the weld joint of a metal material, and is characterized in that the crack trend in the detected weld joint is judged by comparing, analyzing and calculating an included angle between the crack direction and the advancing direction of a probe by using different impedance plane diagram signals obtained by detecting two groups of coils in eddy current testing, and the specific method comprises the following steps:
a. electromagnetic eddy current nondestructive testing: scanning and detecting the metal material to be detected by using an eddy current detection device;
b. detection signal impedance signal extraction: extracting impedance plane graph signals in two coil detection signal values;
c. analyzing the impedance plane diagram: analyzing and calculating different impedance plane vector values in two coils of a group of eddy current detection coils, and analyzing the crack direction of the coils corresponding to the angle and the data change condition;
d. extracting the scanning direction of the detection device: comparing and analyzing the movement direction of the eddy current detection device in the eddy current detection signal value;
f. analyzing and judging the trend of the cracks: and calculating the crack direction in the eddy current detection signal according to the change parameters of the impedance plane graph, comparing and analyzing the crack direction with the scanning direction of the detection device to obtain an included angle between the crack direction and the detection device, and judging the crack trend in the detected weld joint.
And b, extracting the impedance information of the detection signal, and selectively extracting the detection signals of a pair of eddy current detection coils with smaller extraction values of the eddy current detection signals as the objects of selective analysis.
The two groups of eddy current detection coils are impedance plane graph information of the two groups of detection coils which are vertically wound.
The method also comprises the step of taking an eddy current signal detected by the absolute eddy current detection coil as a compensation signal of the crack trend to compensate the influence of the lift-off value of the eddy current detection on the detection information.
The absolute eddy current detection coils are provided at both front and rear end positions in the moving direction of the detection device, and correct the influence of the adhesion detection surface when the detection device moves.
The invention also discloses an eddy current testing device capable of displaying the crack trend, which is used for detecting the crack trend in the electromagnetic eddy current nondestructive testing of the metal material welding seam, the eddy current testing device 10 is connected to a detection analysis instrument 12 through a lead 11, and comprises a probe main body 13, a first eddy current detection coil 101 and a second eddy current detection coil 102, and is characterized in that in the eddy current testing signals obtained by the detection of two groups of eddy current detection coils 101 and 102 in the eddy current testing device, different impedance plane diagram signals of the two groups of coils are analyzed, and the included angle between the crack direction and the probe advancing direction is calculated by comparative analysis, so as to determine the crack trend in the detected welding seam.
The probe body 13 is a cylindrical structure, and the first eddy current detection coil 101 and the second eddy current detection coil 102 are arranged such that a square coil is wound in the axial direction of the probe body 13 having the cylindrical structure.
The first eddy current detection coil 101 and the second eddy current detection coil 102 are provided as eddy current detection coils perpendicular to each other.
As shown in fig. 5 and 6, a plurality of sets of intersecting eddy current detection coils 101a, 102a, 101b, 102b, 101c, 102c are wound radially around the probe body 13 of the eddy current testing apparatus 10, or a plurality of eddy current detection coils 103a,103b,103c are wound axially, and the angle between the crack direction and the probe advancing direction is calculated by selectively comparing the plane impedance diagram of the test data of any two corresponding eddy current detection coils, so as to determine the crack trend in the tested weld.
The eddy current inspection apparatus 10 further includes absolute type eddy current detection coils 103a,103b,103c selected to be wound radially around the end portion of the probe body 13. The absolute eddy current detection coil may further include a set of two absolute coils 103a and 103b wound around two end portions of the end of the probe body 13 in the radial direction, and the absolute coils are disposed at the front and rear ends of the movement direction of the detection device to compare and calibrate the adhesion degree between the eddy current device 10 and the detection surface, i.e., to equalize the lift-off value.
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 method for detecting the crack trend of the welding seam is characterized in that the crack trend of the detected welding seam is judged by utilizing different impedance plane diagram signals obtained by detecting two groups of coils in eddy current detection and calculating an included angle between the crack direction and the advancing direction of a probe through contrastive analysis, and the method comprises the following specific steps:
a. electromagnetic eddy current nondestructive testing: scanning and detecting the metal material to be detected by using an eddy current detection device;
b. detection signal impedance signal extraction: extracting impedance plane graph signals in two coil detection signal values;
c. analyzing the impedance plane diagram: analyzing and calculating different impedance plane vector values in two coils of a group of eddy current detection coils, and analyzing the crack direction of the coils corresponding to the angle and the data change condition;
d. extracting the scanning direction of the detection device: comparing and analyzing the movement direction of the eddy current detection device in the eddy current detection signal value;
f. analyzing and judging the trend of the cracks: and calculating the crack direction in the eddy current detection signal according to the change parameters of the impedance plane graph, comparing and analyzing the crack direction with the scanning direction of the detection device to obtain an included angle between the crack direction and the detection device, and judging the crack trend in the detected weld joint.
2. The method according to claim 1, wherein the detection signal impedance information is extracted in step b, and the detection signals of a pair of eddy current detection coils with a smaller eddy current detection signal lift-off value are selectively extracted as objects of selective analysis.
3. The method according to claim 1 or 2, wherein the two sets of eddy current detecting coils are perpendicularly wound to each other and have impedance plane view information.
4. The method for detecting the crack orientation of the weld according to claim 1, further comprising compensating the influence of the lift-off value of the eddy current detection on the detection information by using an eddy current signal detected by an absolute type eddy current detection coil as a compensation signal for the crack orientation.
5. The method of claim 4, wherein the absolute eddy current test coils are disposed at front and rear end positions in a moving direction of the testing device, and are used to correct the influence of the contact test surface when the testing device moves.
6. The eddy current detection device capable of displaying the crack trend comprises a probe main body (13), a first eddy current detection coil (101) and a second eddy current detection coil (102), and is characterized in that in eddy current detection signals obtained by detection of two groups of eddy current detection coils (101, 102) in the eddy current detection device, different impedance plane diagram signals of the two groups of coils are analyzed, and an included angle between the crack direction and the probe advancing direction is calculated through contrastive analysis to judge the crack trend in a detected welding seam.
7. An eddy current testing device capable of indicating crack trend according to claim 6, wherein the probe body (13) is a cylindrical structure, and the first eddy current testing coil (101) and the second eddy current testing coil (102) are arranged with a square coil wound around the cylindrical structure of the probe body (13) in the axial direction.
8. An eddy current inspection apparatus capable of indicating the trend of a crack according to claim 7, wherein the first eddy current detection coil (101) and the second eddy current detection coil (102) are arranged as eddy current detection coils perpendicular to each other.
9. An eddy current testing device capable of displaying crack trend according to claim 6 is characterized in that the probe body (13) of the eddy current testing device (10) is radially wound with a plurality of sets of crossing eddy current detecting coils (101a, 102a; 101b, 102b; 101c, 102 c) or axially wound with a plurality of eddy current detecting coils (103a,103b,103c), and the crack trend in the tested weld joint is determined by analyzing and calculating the included angle between the crack direction and the probe advancing direction by selectively comparing the plane impedance diagram of the testing data of any two corresponding eddy current detecting coils.
10. An eddy current testing device capable of showing the trend of cracks according to claim 6, wherein the eddy current testing device (10) further comprises absolute type eddy current detecting coils (103a,103b,103c) selected to be wound radially around the end of the probe body (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111650252.5A CN114397360A (en) | 2021-12-30 | 2021-12-30 | Eddy current detection method and detection device for weld crack trend |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111650252.5A CN114397360A (en) | 2021-12-30 | 2021-12-30 | Eddy current detection method and detection device for weld crack trend |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114397360A true CN114397360A (en) | 2022-04-26 |
Family
ID=81229348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111650252.5A Pending CN114397360A (en) | 2021-12-30 | 2021-12-30 | Eddy current detection method and detection device for weld crack trend |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114397360A (en) |
-
2021
- 2021-12-30 CN CN202111650252.5A patent/CN114397360A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7038445B2 (en) | Method, system and apparatus for ferromagnetic wall monitoring | |
| US5648721A (en) | Rotating flux-focusing eddy current probe for flaw detection | |
| US5698977A (en) | Eddy current method for fatigue testing | |
| US8274276B2 (en) | System and method for the non-destructive testing of elongate bodies and their weldbond joints | |
| JP4885068B2 (en) | Eddy current flaw detector and eddy current flaw detection method | |
| CN110702783A (en) | Array eddy current method for detecting thermal fatigue cracks of water-cooled wall tube | |
| WO2000008458A1 (en) | Eddy-current flaw detector probe | |
| JPS5877653A (en) | Nondestructive testing device | |
| CN103076390A (en) | Positioning method and device applied to eddy current flaw detection, and eddy current flaw detector | |
| JP2010048624A (en) | Low-frequency electromagnetic induction type defect measuring apparatus | |
| CN109596702B (en) | Nondestructive testing device and method for surface defects | |
| JP2009036682A (en) | Eddy current sensor, and device and method for inspecting depth of hardened layer | |
| CN113030241B (en) | Device and method for distinguishing magnetic flux leakage detection signals of inner wall and outer wall of steel pipe in use | |
| JP2006153856A (en) | Device and method for inspecting scratch on external case for cell | |
| CN114397360A (en) | Eddy current detection method and detection device for weld crack trend | |
| Sun et al. | A remote field eddy current NDT probe for the inspection of metallic plates | |
| CN110763755A (en) | Evaluation method capable of rapidly evaluating crack defect direction of metal material | |
| CN211478151U (en) | Array probe for eddy current testing of curved surface workpiece | |
| JP2007163263A (en) | Eddy current flaw detection sensor | |
| KR102283396B1 (en) | Sensor Probe tesing System for Eddy Current Nondestructive Testing | |
| CN211553856U (en) | Ring type eddy current testing probe | |
| EP0792455B1 (en) | Eddy current hybrid probe | |
| CN113109424B (en) | Steel structure welding line detection method and detection system | |
| CN117934466B (en) | Three-dimensional model auxiliary electromagnetic-optical fusion imaging metal structure detection method | |
| CN206161587U (en) | Accurate detection device of multiple dimensioned magnetic leakage that steel pipe corrodes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |