CN213121719U - Spot welding nugget form detection device - Google Patents
Spot welding nugget form detection device Download PDFInfo
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- CN213121719U CN213121719U CN202022239263.1U CN202022239263U CN213121719U CN 213121719 U CN213121719 U CN 213121719U CN 202022239263 U CN202022239263 U CN 202022239263U CN 213121719 U CN213121719 U CN 213121719U
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Abstract
The utility model relates to a spot welding nugget form detection device, which comprises a weak magnetic sensor, a base used for installing the weak magnetic sensor, and an upper cover fixedly connected with the base, wherein the base is provided with a concave hole used for installing the weak magnetic sensor; a first interface is formed in one side of the upper cover and used for mounting an aviation plug; and a second interface is arranged on the other side of the upper cover and used for installing a control switch for controlling the weak magnetic sensor, and the control switch is used for controlling the signal acquisition of the weak magnetic sensor. The utility model discloses a base design of ladder shape can be fast and accurately the location weld the nuclear region, realizes welding the regional full coverage of nuclear and detects, can also calculate according to the detected value of weak magnetic sensor and weld nuclear area and degree of depth.
Description
Technical Field
The utility model relates to a magnetism detects technical field, especially relates to a spot welding nugget form detection device.
Background
The resistance spot welding has wide application, and the spot welding structure has the advantages of light weight, high static strength, good reliability, stable performance, easy realization of automation and the like, and is a main connection mode among metal plates. The spot welding applies and maintains certain pressure to the welded workpiece through the electrode to ensure that the workpiece is stably contacted, then the current output by the welding power supply passes through the welded workpiece and the contact surface of the welded workpiece, generates heat, increases the temperature and melts the local part of the contact point to form a welding point.
The common nondestructive detection method for the spot welding nuggets comprises the following steps: eddy Current Test (ECT), Radiation Test (RT), Ultrasonic Test (UT), weak magnetic test, etc. Eddy current inspection (ECT) is generally applicable to surface and near-surface inspection. The detection rate of the defects by ray detection (RT) is high, and the defect imaging is more visual; however, the depth of the defect cannot be effectively quantified due to the influence of the incident angle and the thickness of the member. Ultrasonic Testing (UT) generally requires a couplant, and also has the problem that defects can be detected but the depth of burial cannot be determined. Thus, the above-described non-destructive inspection techniques are generally capable of finding defects, but fail to accurately quantify the buried depth of the defects.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a spot welding welds nuclear form detection device is provided, can not only detect spot welding and weld nuclear region with the full coverage, can also detect spot welding and weld the size and the degree of depth of nuclear.
The utility model provides a technical scheme that its technical problem adopted is: the spot welding nugget form detection device comprises a weak magnetic sensor, a base for mounting the weak magnetic sensor, and an upper cover fixedly connected with the base, wherein the base is provided with a concave hole for mounting the weak magnetic sensor; a first interface is formed in one side of the upper cover and used for mounting an aviation plug; and a second interface is arranged on the other side of the upper cover and used for installing a control switch for controlling the weak magnetic sensor, and the control switch is used for controlling the signal acquisition of the weak magnetic sensor.
The weak magnetic sensor comprises a magnetic core and a coil wound on the magnetic core, wherein the coil comprises an excitation coil used for supplying power to the weak magnetic sensor and a signal coil used for acquiring signals.
The induction angle of the weak magnetic sensor during detection is 45-50 degrees.
The base is provided with a cuboid protruding out of the lower surface of the base, and the concave hole is formed in the cuboid.
The ratio of the wall thickness of the lower surface of the base to the aperture of the concave hole is 1: 1.
the ratio of the aperture of the concave holes, the distance between the concave holes and the depth of the concave holes is 1: 1: 3.5.
the arrangement mode of the concave holes is an array structure of m x n.
The number of concave holes is at least 25.
Advantageous effects
Since the technical scheme is used, compared with the prior art, the utility model, have following advantage and positive effect: the utility model provides a spot welding nugget form detection device can be fast and accurately positioned the nugget area through the base design of the ladder shape, realize the full coverage detection of the nugget area, can also calculate the nugget area and the depth according to the detection value of the weak magnetic sensor; the utility model provides a weak magnetic sensor need not the initiative excitation, the utility model discloses a detection device small in size just can reach higher detection resolution, still is applicable to one-hand operation.
Drawings
FIG. 1 is an external view schematically showing a spot welding nugget form detecting apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic view of an upper cover according to an embodiment of the present invention;
fig. 3 is a schematic view of a weak magnetic sensor according to an embodiment of the present invention;
fig. 4 is a schematic view of a base of an embodiment of the present invention;
FIG. 5 is a schematic view of the spot welding nugget form detection apparatus according to the embodiment of the present invention;
fig. 6 is a schematic diagram of the detection according to the embodiment of the present invention;
fig. 7 is a schematic diagram of a sensitive area and an overlapping area of an embodiment of the present invention during detection.
Detailed Description
The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.
The utility model discloses an embodiment relates to a spot welding welds nuclear form detection device, as shown in FIG. 1, does the utility model discloses embodiment's spot welding welds nuclear form detection device outward appearance sketch map, include the weak magnetic sensor, be used for the installation the base of weak magnetic sensor, and with base fixed connection's upper cover, the base is seted up and is used for the installation the shrinkage pool of weak magnetic sensor. As shown in fig. 2, which is a schematic view of an upper cover according to an embodiment of the present invention, a first interface (circular) is disposed on one side of the upper cover, and the first interface is used for installing an aviation plug; and a second interface (rectangle) is arranged on the other side of the upper cover, the second interface is used for installing and controlling a control switch of the weak magnetic sensor, and the control switch is used for controlling the signal acquisition of the weak magnetic sensor, so that the detection device is operated by one hand.
Further, as shown in fig. 3, a schematic diagram of the weak magnetic sensor according to an embodiment of the present invention is shown, where the weak magnetic sensor includes a magnetic core and a coil wound around the magnetic core, the coil is a common enameled wire, and the coil includes an excitation coil for supplying power to the weak magnetic sensor and a signal coil for acquiring signals; the coil has three outgoing lines, one of the three outgoing lines is an exciting coil outgoing line, the other outgoing line is a signal coil outgoing line, and the last outgoing line is shared by the exciting coil and the signal coil. The space occupied by the weak magnetic sensor can be equivalent to a cylindrical structure with the diameter of 2mm, and interference fit with the concave hole is achieved.
As shown in fig. 4, for the utility model discloses embodiment's base schematic diagram combines fig. 1 to see the base is the ladder shape, the base is provided with the cuboid of protrusion in the base lower surface, the shrinkage pool is seted up in the cuboid. The size of a cuboid part for mounting the weak magnetic sensor is small, namely the size of a part in contact with the welding core is small, and the size of the upper cover part is large, so that the design mode of the stepped form with different sizes is convenient for detection personnel to manually operate, and is favorable for observing the alignment condition of the weak magnetic sensor and the welding core; the ratio of the wall thickness of the lower surface of the base to the aperture of the concave hole is 1: 1, the ratio of the aperture of the concave hole, the distance between the concave holes and the depth of the concave hole is 1: 1: 3.5. the shrinkage pool shape in this embodiment is the cylinder, and the aperture of shrinkage pool is 2mm, then the lower surface wall thickness of base is 2mm, owing to receive the hole site restriction of shrinkage pool, the distance between the shrinkage pool is 2 mm. The distance between the concave holes is 2mm, the wall thickness of the lower surface of the base is 2mm, the sensitive areas of the weak magnetic sensors are overlapped due to the two length settings, and the sensitive areas can be reduced if the wall thickness of the lower surface of the base is too thin. The hole depth of the concave hole is 7 mm. The arrangement mode of shrinkage pool is the array structure of m n, the quantity of shrinkage pool is 25 at least. The quantity of the weak magnetic sensors is generally set according to the size of the weld nugget, the array size of the weak magnetic sensors is larger than that of the weld nugget, fewer weak magnetic sensors are used for detecting smaller weld nuggets, and more weak magnetic sensors are used for detecting larger weld nuggets, so that the cost is saved.
As shown in fig. 5 and 6, do respectively the utility model discloses the spot welding weld nucleus form detection device of embodiment acts on the sketch map to and detect the sketch map, the inspector can the one-hand handheld detection device of one hand detect the weld nucleus, the angle of induction when weak magnetic sensor detects is 45 to 50, and the lower surface wall thickness that combines the base is 2mm and the aperture of shrinkage pool is 2mm, theoretically speaking, in certain extent, weak magnetic sensor's detection range can become a circle that gradually enlarges along with the increase of detection distance, and the detection area that every weak magnetic sensor can cover promptly is the circular region that the diameter is more than or equal to 6mm, and detection area's full coverage can be realized to such design to there is a small amount of overlap area between each weak magnetic sensor's the sensitive area. In fig. 5, the angle of induction when supposing that weak magnetic sensor detects is 45, and under the condition that the lower surface wall thickness of base is 2mm, the outside extension of every weak magnetic sensor sensitive area will reach 2mm, and every weak magnetic sensor's sensitive area is a diameter 6 mm's circular region promptly, as shown in fig. 7, for the utility model discloses embodiment sensitive area and the overlapping region sketch map when detecting, because the distance between the shrinkage pool is 2mm, guarantee can realize 100% overlap, overlapping region makes to be detected the piece and can obtain comprehensive detection, avoids lou examining.
During actual detection, the spot welding weld nugget form detection device firstly determines the area where the weld nugget is located, and then calculates the weld nugget area and the weld nugget depth according to the actual detection value of the weak magnetic sensor, and specifically comprises the following steps: the detection values of all weak magnetic sensors in the detection device can form a weak magnetic sensor detection value matrix, and the formula is as follows:
wherein, BijIs the detection value of the weak magnetic sensor and is based on the formula
To calculate the depth of the nugget,
and BcenterIs the average of the measurements of all outermost weak magnetic sensors in the detection device, mu0Is vacuumThe magnetic permeability of the magnetic material is improved,
the magnetic field generated by the difference and stress of the substrate material at the junction of the welding core and the substrate material, theta is an included angle between the position vector from the magnetic field at the junction of the welding core and the substrate material to the weak magnetic sensor, and K is a correction coefficient; the area of the weld nugget can also be determined according to the detection values of the weak magnetic sensors.
Therefore, the utility model provides a spot welding welds nuclear form detection device can fix a position the nuclear welding region fast and accurately through the base design of ladder shape, can also calculate according to weak magnetic sensor's detected value and weld nuclear area and degree of depth, the utility model discloses a detection device small in size just can reach higher detection resolution ratio, still is applicable to the one-hand operation.
Claims (8)
1. A spot welding nugget form detection device is characterized by comprising a weak magnetic sensor, a base used for mounting the weak magnetic sensor, and an upper cover fixedly connected with the base, wherein the base is provided with a concave hole used for mounting the weak magnetic sensor; a first interface is formed in one side of the upper cover and used for mounting an aviation plug; and a second interface is arranged on the other side of the upper cover and used for installing a control switch for controlling the weak magnetic sensor, and the control switch is used for controlling the signal acquisition of the weak magnetic sensor.
2. The spot welding nugget form detecting apparatus according to claim 1, wherein the weak magnetic sensor includes a magnetic core and a coil wound around the magnetic core, the coil including an excitation coil for supplying power to the weak magnetic sensor, and a signal coil for signal acquisition.
3. The spot welding nugget form detection apparatus according to claim 1, wherein a sensing angle at the time of detection by the weak magnetic sensor is 45 ° to 50 °.
4. The spot welding nugget form detection device according to claim 1, wherein the base is provided with a rectangular parallelepiped protruding from a lower surface of the base, and the concave hole is opened in the rectangular parallelepiped.
5. The spot welding nugget form detection device according to claim 1, wherein a ratio of a wall thickness of the lower surface of the base to a hole diameter of the recessed hole is 1: 1.
6. the spot welding nugget form detection apparatus according to claim 1, wherein a ratio of a hole diameter of the recessed holes, a distance between the recessed holes, and a hole depth of the recessed holes is 1: 1: 3.5.
7. the apparatus of claim 1, wherein the recesses are arranged in an array of m x n recesses.
8. The spot welding nugget form detecting apparatus according to claim 1, wherein the number of concave holes is at least 25.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022239263.1U CN213121719U (en) | 2020-10-10 | 2020-10-10 | Spot welding nugget form detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022239263.1U CN213121719U (en) | 2020-10-10 | 2020-10-10 | Spot welding nugget form detection device |
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| CN213121719U true CN213121719U (en) | 2021-05-04 |
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| CN202022239263.1U Active CN213121719U (en) | 2020-10-10 | 2020-10-10 | Spot welding nugget form detection device |
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