CN112067689A - Interconnection differential type welding seam eddy current detection sensor - Google Patents
Interconnection differential type welding seam eddy current detection sensor Download PDFInfo
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- 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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Abstract
An interconnected differential weld joint eddy current detection sensor comprises an excitation module, a detection module and an auxiliary detection module; the excitation module generates an eddy current field and consists of a single excitation coil, and the axis of the excitation coil is vertical to the detection surface; the detection module is used for picking up detection information containing defects and is composed of two groups of differential detection coils, and the differential detection coils are located inside the excitation coils. According to the interconnected differential weld eddy current detection sensor, the detection module is parallel to the detection surface due to the axis of the detection module, so that the anti-interference capability of the sensor is enhanced, the detection sensitivity is increased due to the differential structure, the detection blind area is eliminated due to the combination of the two groups of differential detection coils, the detection range is enlarged, and the detection efficiency is improved; the excitation coil is used for profiling the welding line, so that an excitation field is more stable and uniform; the auxiliary detection module is adaptive to the surface state of the welding seam, so that the differential detection coil is perpendicular to the detection surface, and the noise is reduced.
Description
Technical Field
The invention relates to the field of nondestructive testing, in particular to an interconnected differential type welding seam eddy current testing sensor.
Background
The welding seam brings larger interference signals to eddy current detection due to the unevenness of the surface of the welding seam, and the conventional eddy current welding seam probe still has larger noise signals during detection, so that the detection sensitivity is low. Due to the orthogonal structure of the conventional eddy current welding seam probe, the detection range of the probe is small, missing detection is easy to occur, and the detection efficiency is low; and the rigid structure of the welding line leads the welding line to be in hard contact with the fluctuation of the surface of the welding line in the walking process to generate a large amount of interference, thereby being not beneficial to the identification of defects. Although the non-directional orthogonal eddy current welding seam probe solves the problem of detection blind area, the detection sensitivity is further reduced by the positive overlapping of a plurality of groups of coils, the detection efficiency is low, the noise is large, and the defect detection of actual welding seams is not facilitated.
Disclosure of Invention
The invention aims to provide an interconnected differential type welding seam eddy current detection sensor aiming at the defects of the prior art, and the detection probe has the advantages of strong flexibility, large effective detection area, high detection efficiency, strong anti-interference capability, high space utilization rate and the like.
In order to solve at least one of the above technical problems, the technical solution adopted by the present invention is:
an interconnection differential type welding seam eddy current detection sensor comprises an excitation module, a detection module and an auxiliary detection module; the excitation module generates an eddy current field and consists of a single excitation coil, and the axis of the excitation coil is vertical to the detection surface; the detection module is used for picking up detection information containing defects and consists of two groups of differential detection coils, and the differential detection coils are positioned in the excitation coils; the auxiliary detection module is used for ensuring that the differential detection coil is adaptive to a weld curved surface and consists of a coil fixing device and a spring positioned at the top of the coil fixing device.
Furthermore, the excitation coil is in a hollow cuboid shape, at least part of the long side of the excitation coil protrudes in a crescent shape, at least part of the long side of the excitation coil protrudes and straddles the surface of the weld joint, and the excitation coil forms an excitation field in both the weld toe and the heat affected zone.
Further, the detection module has a long side and a short side, the long side of the differential detection coil is placed perpendicular to the detection surface, the short side of the differential detection coil is parallel to one side of the excitation coil, and the midpoint of the short side of the differential detection coil is separated from the midpoint of the side parallel to the excitation coil 2 in the direction of the short side by a distance of half the thickness of the differential detection coil.
Furthermore, the number of the differential detection coils is four, the four differential detection coils are enclosed to form a rectangular shape, the four coils are symmetrical about the center of the excitation coil, and the distance between the four coils relative to the two differential detection coils is equal to the sum of the length of the coils and the width of the coils.
Furthermore, two adjacent coils of one of the four differential detection coils form a group of differential detection coils, and two of the differential detection coils outside the group of differential detection coils form another group of differential detection coils.
Further, each set of the differential detection coils can rotate around the center thereof by 0-45 degrees, and each differential detection coil is rectangular in shape.
Furthermore, the signals of the two groups of differential detection coils are used for eliminating noise signals, and the signals formed by the two groups of differential detection coils are transmitted to a signal display end through an aviation plug and a signal wire.
Further, interconnection differential type welding seam eddy current testing sensor still includes the shell, differential detection coil with exciting coil all accept in the shell, coil fixing device is located on the differential detection coil, the spring is fixed in on the shell, coil fixing device passes through the spring is used for right the bellied self-adaptation in welding seam surface, differential detection coil with the laminating of welding seam surface.
According to the interconnected differential weld eddy current detection sensor, the detection module is parallel to the detection surface due to the axis of the detection module, so that the anti-interference capability of the sensor is enhanced, the detection sensitivity is increased due to the differential structure, the detection blind area is eliminated due to the combination of the two groups of differential detection coils, the detection range is enlarged, and the detection efficiency is improved; the excitation coil is used for profiling the welding line, so that an excitation field is more stable and uniform; the auxiliary detection module is adaptive to the surface state of the welding seam, so that the differential detection coil is always perpendicular to the detection surface, and the noise is reduced. The measures improve the sensitivity of the welding seam eddy current detection.
Drawings
FIG. 1 is a schematic perspective view of an interconnected differential weld eddy current test sensor according to the present invention;
FIG. 2 is a schematic plan view of the interconnected differential weld eddy current test sensor of FIG. 1;
FIG. 3 is a schematic view of the housing, spring, and weld of the interconnected differential weld eddy current test sensor of FIG. 1;
in the figure: the device comprises a differential detection coil 1, an excitation coil 2, a coil fixing device 3, a spring 4, a shell 5, an aviation plug 6, a signal wire 7 and a welding seam 8.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to specific examples. The following examples are illustrative only and are not to be construed as limiting the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications.
Referring to fig. 1-3, the present invention provides an interconnection differential weld eddy current test sensor, which includes a differential detection coil 1, an excitation coil 2, a coil fixing device 3, a spring 4, a housing 5, an aviation plug 6 and a signal wire 7. Specifically, differential detection coil 1 and excitation coil 2 are acceptd in shell 5, and coil fixing device 3 is located differential detection coil 1, and coil fixing device 3 constitutes supplementary detection module with spring 4 that is located its top, and excitation coil 2 is hollow cuboid form, excitation coil's long limit at least part arch is crescent, suitably laminates in the welding seam surface. The auxiliary detection module is located within the excitation coil 2. An aviation plug 6 is located on the outer surface of the housing 5 and a signal wire 7 is located on the aviation plug 6. It will be appreciated that the location of the aircraft plug 6 is not limited, for example, in this embodiment the aircraft plug 6 is located at the upper end of the housing 5, it will be appreciated that in another embodiment not shown the aircraft plug 6 may also be located at the side of the housing 5.
The excitation module generates an eddy current field and consists of a single excitation coil, and the central axis of the excitation coil 2 is perpendicular to the detection surface. The upper end face and the lower end face of the auxiliary detection module are parallel to the detection face, so that the anti-interference capability of the sensor is enhanced.
The differential detection coil 1 is provided with a long side and a short side, the long side of the differential detection coil 1 is arranged perpendicular to a detection surface, the short side of the differential detection coil 1 is parallel to one side of the excitation coil 2, the middle point of the short side of the differential detection coil 1 is separated from the middle point of the side parallel to the excitation coil 2 in the direction of the short side by a half differential detection coil thickness distance, the number of the differential detection coils 1 is four, the four differential detection coils 1 are enclosed to form a rectangle, the four differential detection coils 1 are centrosymmetric about the excitation coil 2, the distance = the coil length + the coil width relative to the two differential detection coils 1, two adjacent coils of one of the four differential detection coils form a group of differential detection coils, and the two differential detection coils outside the group of differential detection coils form another group of differential detection coils. The two groups of differential detection coils 1 can rotate around the center by 0-45 degrees, and each differential detection coil is rectangular.
In the embodiment, the excitation module generates an eddy current field, the long sides of part of the excitation coils 2 are raised and straddle the surface of the weld joint, and the excitation coils 2 form excitation fields in the weld toe and the heat affected zone; the detection module is used for picking up detection information containing defects and consists of two groups of differential detection coils, the differential detection coils are positioned in the excitation coil, signals of two adjacent differential detection coils 1 are subjected to difference elimination to eliminate noise signals caused by lift-off and the like, the detection sensitivity is improved, the front and rear groups of differential detection coils 1 work simultaneously, and the detection efficiency and the signal reliability are improved; the auxiliary detection module is used for ensuring that the differential detection coil 1 is adaptive to a weld curved surface, the spring 4 is fixed on the shell 5, the bottom coil fixing device 3 realizes the convex self-adaptation to the weld surface 8 under the action of the spring 4, and when the differential detection coil passes through the fish scale of the weld, the convex part extrudes the spring through the transmission of the coil fixing device to drive the differential detection coil to rise; when the differential detection coil leaves the convex part, the spring elasticity drives the coil fixing device to press downwards, so that the differential detection coil 1 is always attached to the surface 8 of the welding seam. Signals formed by the two groups of differential detection coils 1 are transmitted to a signal display end through the aviation plug 6 and the signal wire 7.
In conclusion, the detection module of the invention has the advantages that the axis is parallel to the detection surface, so that the anti-interference capability of the sensor is enhanced, the detection sensitivity is increased by the differential structure, the detection blind zone is eliminated by the combination of the two groups of differential detection coils 1, the detection range is enlarged, and the detection efficiency is improved; the excitation coil 2 is used for profiling a welding seam, so that an excitation field is more stable and uniform; the auxiliary detection module is adaptive to the surface state of the welding seam, so that the differential detection coil is always perpendicular to the detection surface, and the noise is reduced.
Although embodiments of the present invention have been shown and described, it is understood that the embodiments are illustrative and not restrictive, that various changes, modifications, substitutions and alterations may be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The utility model provides an interconnection differential type welding seam eddy current testing sensor which characterized in that: the device comprises an excitation module, a detection module and an auxiliary detection module; the excitation module generates an eddy current field and consists of a single excitation coil, and the axis of the excitation coil is vertical to the detection surface; the detection module is used for picking up detection information containing defects and consists of two groups of differential detection coils, and the differential detection coils are positioned in the excitation coils; the auxiliary detection module is used for ensuring that the differential detection coil is adaptive to a weld curved surface and consists of a coil fixing device and a spring positioned at the top of the coil fixing device.
2. The interconnected differential weld eddy current test sensor as defined in claim 1, wherein: the excitation coil is in a hollow cuboid shape, at least part of the long side of the excitation coil protrudes in a crescent shape, at least part of the long side of the excitation coil protrudes and is spanned on the surface of a welding seam, and the excitation coil forms an excitation field in a welding toe and a heat affected zone.
3. The interconnected differential weld eddy current test sensor as defined in claim 2, wherein: the detection module is provided with a long side and a short side, the long side of the differential detection coil is arranged perpendicular to the detection surface, the short side of the differential detection coil is parallel to one side of the excitation coil, and the midpoint of the short side of the differential detection coil is separated from the midpoint of the side parallel to the excitation coil 2 in the short side direction by a half thickness distance of the differential detection coil.
4. The interconnected differential weld eddy current test sensor as defined in claim 3, wherein: the four differential detection coils are arranged in a rectangular shape, are symmetrical relative to the center of the excitation coil, and are spaced from each other by a distance equal to the sum of the length and the width of the coil.
5. The interconnected differential weld eddy current test sensor as defined in claim 4, wherein: two adjacent coils of one of the four differential detection coils form a group of differential detection coils, and the two differential detection coils outside the group of differential detection coils form another group of differential detection coils.
6. The interconnected differential weld eddy current test sensor as defined in claim 5, wherein: each group of the differential detection coils can rotate around the center thereof by 0-45 degrees, and each differential detection coil is rectangular.
7. The interconnected differential weld eddy current test sensor as defined in claim 6, wherein: the signals of the two groups of differential detection coils are used for eliminating noise signals, and the signals formed by the two groups of differential detection coils are transmitted to a signal display end through an aviation plug and a signal wire.
8. The interconnected differential weld eddy current test sensor as defined in claim 7, wherein: the interconnected differential type welding seam eddy current detection sensor further comprises a shell, the differential detection coil and the excitation coil are contained in the shell, the coil fixing device is located on the differential detection coil, the spring is fixed on the shell, the coil fixing device is used for aligning the spring to the convex self-adaptation of the welding seam surface, and the differential detection coil is attached to the welding seam surface.
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| CN202010862938.XA CN112067689A (en) | 2020-08-25 | 2020-08-25 | Interconnection differential type welding seam eddy current detection sensor |
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| CN202010862938.XA CN112067689A (en) | 2020-08-25 | 2020-08-25 | Interconnection differential type welding seam eddy current detection sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112688294A (en) * | 2020-12-16 | 2021-04-20 | 南昌航空大学 | Consistency coordination control method for flexible interconnected direct-current micro-grid group |
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| JP2012141251A (en) * | 2011-01-05 | 2012-07-26 | Jfe Steel Corp | Surface layer defect detection device |
| CN102967256A (en) * | 2012-11-20 | 2013-03-13 | 华中科技大学 | Pulse eddy current probe for pipeline |
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| CN112688294B (en) * | 2020-12-16 | 2022-09-27 | 南昌航空大学 | Consistency coordination control method for flexible interconnected direct-current micro-grid group |
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