Ultrasonic phased array inspection apparatus for a butt weld

Abstract

The application discloses a connecting weld ultrasonic phased array detection device, which is used for detecting the connecting weld between a connecting pipe and a cylinder of a reactor pressure vessel and comprises a wedge and a probe. The connecting weld ultrasonic phased array detection device is influenced by factors such as the material and specification of the connecting weld between the connecting pipe and the cylinder of the reactor pressure vessel, a defect direction, a phased array probe frequency, a wave type, an array element size, an effective coverage range of a sound beam, a detection efficiency and a quantitative effect, the size of the wedge is designed, secondary interface waves appear at a specific position, interference on defect waves is avoided, identification and quantification of defects are avoided, and only the wedge can be used to adapt to different ultrasonic phased array probes to complete detection and quantification of the connecting weld between the connecting pipe and the cylinder of the reactor pressure vessel.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of phased array ultrasonic detection, in particular to a connecting weld ultrasonic phased array detection device. BACKGROUND

[0002] The reactor pressure vessel (RPV) is a core component of a nuclear power unit. The connecting weld between the inlet and outlet nozzles and the cylinder of the component adopts an insert welding method, has a saddle-shaped outer shape structure, and is relatively complex in structure. The weld has a large thickness. Manufacturing defects can be generated during the manufacturing stage. Under the in-service conditions of long-term high temperature, high pressure and high irradiation, the defects in the weld can expand and change, which can have a significant impact on the pressure bearing of the equipment. In order to discover dangerous defects generated in the weld as early as possible, it is necessary to regularly perform ultrasonic detection, thereby maintaining and ensuring the safe operation of the nuclear power facility.

[0003] Currently, an automatic inspection device is used to carry out ultrasonic phased array inspection technology to detect the connecting weld between the inlet and outlet nozzles and the cylinder of the reactor pressure vessel. The technology is a new technology developed on the basis of the original conventional ultrasonic inspection technology, and is a special ultrasonic detection technology. The technology uses a precise and complex phased array and a powerful software to control the ultrasonic beam to cover the detected material and generate a corrected internal structure image of the material.

[0004] The ultrasonic phased array inspection of the connecting weld between the inlet and outlet nozzles and the cylinder of the reactor pressure vessel is performed by the automatic inspection device to drive the ultrasonic probe to detect from the inner surface of the nozzle. The phased array probe wedge used in the existing ultrasonic detection technology is relatively thin. The multiple interface waves (reflected waves of the wedge and the detection surface) and the ultrasonic waves converted in the waveforms have small energy attenuation and large sound path ranges, which interfere with the identification and quantification of defects. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a connecting weld ultrasonic phased array detection device.

[0006] The technical scheme adopted by the present application to solve the technical problem is that a connecting weld ultrasonic phased array detection device is constructed, which is used for detecting the connecting weld between the nozzle and the cylinder of the reactor pressure vessel. The device comprises a wedge and a probe. The probe comprises a plurality of wafer units arranged side by side in parallel. The wedge has a front end surface, a rear end surface and an inclined end surface. The front end surface and the rear end surface are arranged opposite to each other. The inclined end surface is arranged inclined to the horizontal plane of the wedge. A plurality of wafer units are arranged on the inclined end surface, and the wafer unit closest to the rear end surface is taken as a reference wafer.

[0007] An inclination angle B of the inclined end face relative to a horizontal plane of the wedge block is 7° to 8°, a vertical distance Z of the reference wafer from a lowest point of the trailing end face is 235 mm to 240 mm, a horizontal distance Y of a center plane of the reference wafer from a side end face of the wedge block is 18 mm to 22 mm, a horizontal distance M of the reference wafer from the trailing end face is 4 mm to 6 mm, and a height H of the leading end face is 240 mm to 245 mm.

[0008] In some embodiments, the inclination angle B of the inclined end face relative to the horizontal plane of the wedge block is 7.76°.

[0009] The vertical distance Z of the reference wafer from the lowest point of the trailing end face is 237 mm.

[0010] In some embodiments, the horizontal distance Y of the center plane of the reference wafer from the side end face of the wedge block is 20 mm.

[0011] The horizontal distance M of the reference wafer from the trailing end face is 5 mm.

[0012] The height H of the leading end face is 243 mm.

[0013] In some embodiments, a distance L of the leading end face from the trailing end face is 128 mm to 132 mm.

[0014] In some embodiments, the number of wafer units is 32.

[0015] In some embodiments, a gap G between each of the wafer units is 0.1 mm, and a width E of each of the wafer units is 1 mm.

[0016] In some embodiments, a bottom surface of the wedge block is an arc surface.

[0017] In some embodiments, a transceiving mode of the probe is a self-transmitting and self-receiving mode.

[0018] In some embodiments, a frequency of the probe is 2 MHz or 4 MHz.

[0019] In some embodiments, a top portion of the leading end face is provided with a sawtooth-shaped groove.

[0020] The implementation of the present application has the following beneficial effects: the wedge is designed in size by the influence of the factors such as the material and specification of the connecting weld between the reactor pressure vessel nozzle and the cylinder, the defect direction, the phased array probe frequency, the wave type, the array element size, the effective coverage range of the sound beam, the detection efficiency and the quantitative effect, so that the secondary interface wave appears at a specific position, the interference to the defect wave is avoided, and the identification and quantification of the defect are avoided, and only the wedge can be used to adapt to different ultrasonic phased array probes to complete the detection and quantification of the connecting weld between the reactor pressure vessel nozzle and the cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the present application, the present application will be further described below in combination with the drawings and examples, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor. In the drawings:

[0022] Fig. 1 is a perspective structural schematic diagram of the connecting weld ultrasonic phased array detection device in some embodiments of the present application;

[0023] Fig. 2 is another perspective structural schematic diagram of the connecting weld ultrasonic phased array detection device in some embodiments of the present application;

[0024] Fig. 3 is a top view structural schematic diagram of the connecting weld ultrasonic phased array detection device in some embodiments of the present application. DETAILED DESCRIPTION

[0025] In order to have a clearer understanding of the technical features, objects and effects of the present application, the specific embodiments of the present application will be described in detail with reference to the drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "upper", "lower", "left", "right", "vertical", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail" and the like are based on the directions or positional relationships shown in the drawings, and are constructed and operated in a specific direction, and are only for the convenience of describing the technical solutions, and cannot be understood as indicating that the devices or elements must have a specific direction, therefore, it cannot be regarded as a limitation to the present application.

[0026] It should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing", "arranging" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. When an element is referred to as "on" or "below" another element, the element can be "directly" or "indirectly" above the other element, or there can be one or more intervening elements. The terms "first", "second", "third" and the like are only for the convenience of describing the technical solutions, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features with "first", "second", "third" and the like can be explicitly or implicitly included one or more of the features. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] Please refer to Figs. 1 to 3 The present application discloses a kind of connecting weld ultrasonic phased array detection device, for the detection of connecting weld between reactor pressure vessel nozzle and cylinder.In the embodiment, the base material quality of the connecting weld between the reactor pressure vessel nozzle and cylinder is manganese nickel molybdenum alloy steel, the quality of filler metal is stainless steel electrode, and the weld thickness is 234mm.Weld position is about 393.5mm from the depth direction of probe scanning surface of nozzle inner surface, and the stainless steel surfacing layer is 6mm thick.

[0028] The connecting weld ultrasonic phased array detection device includes wedge 1 and probe 2, probe 2 includes a plurality of wafer units 21 arranged side by side in parallel, wedge 1 has front end face 11, trailing end face 12 and inclined end face 13, front end face 11 is arranged opposite to trailing end face 12, and inclined end face 13 is arranged inclined to the horizontal plane of wedge 1, a plurality of wafer units 21 are arranged on inclined end face 13, and the wafer unit 21 closest to trailing end face 12 is taken as reference wafer 22. The inclination angle B of inclined end face 13 to the horizontal plane of wedge 1 is 7°-8°, the vertical distance Z of reference wafer 22 to the lowest point of trailing end face 12 is 235mm-240mm, the horizontal distance Y of the center surface of reference wafer 22 to the side end face of wedge 1 is 18mm-22mm, the horizontal distance M of reference wafer 22 to trailing end face 12 is 4mm-6mm, and the height H of front end face 11 is 240mm-245mm.

[0029] The height of the front end surface 11 is greater than that of the rear end surface 12, the front end surface 11 is arranged in parallel with the rear end surface 12, and the front end surface 11 and the rear end surface 12 are both arranged perpendicularly to the side end surface of the wedge 1. In this embodiment, in order to meet the requirement of covering the entire inspection area of the connection weld, the acoustic velocity angle range is 0°-45°, and considering the cooperation of the electronic scanning angle, the longitudinal wave refraction angle of the wedge 1 is preferably 20°.

[0030] According to the Snell formula, we have: In the formula, C1 is the acoustic velocity of the wedge, and the value is 2337 m / s, and C2 is the acoustic velocity of the steel workpiece to be inspected, and the value is 5920 m / s. The wedge beam incidence angle α1 is 7.76°, which can be calculated from the longitudinal wave refraction angle α2 of the wedge, which is 20°. The wedge beam incidence angle of the wedge 1 is the inclination angle B of the inclined end surface 13 relative to the horizontal plane of the wedge 1. The thickness of the wedge 1 is designed to ensure that the weld position echo falls between the first interface echo and the second interface echo of the wedge 1, and the acoustic path S of the most central wafer unit 21 in the probe 2 should satisfy S' is the acoustic path of different angle beams in the workpiece to be inspected. The acoustic path range of 0°-45° beams at a depth of 400 mm is about 400 mm to 565 mm, and the acoustic path value of the 45° beam is the largest, that is, under the condition of ensuring that the 45° beam meets the requirements, all beam ranges will meet the requirements. Through calculation, the minimum value of S is 223 mm. Since the 45° beam corresponds to an angle of 16.2° in the wedge 1, the minimum height of the most central wafer unit 21 from the bottom surface of the wedge 1 is 223xcos16.2°=214mm. According to the minimum height of the most central wafer unit 21 from the bottom surface of the wedge 1, the vertical distance Z between the reference wafer 22 and the lowest point of the rear end surface 12 is set as a reference for determining the vertical distance Z between the reference wafer 22 and the lowest point of the rear end surface 12, so the vertical distance Z between the reference wafer 22 and the lowest point of the rear end surface 12 is set to 235mm to 240mm, and also serves as a reference for the thickness of the wedge 1. The thickness of the wedge 1 is the height H of the front end surface 11.

[0031] When the length of the wedge 1 needs to be determined, the distance of the edge wafer unit 21 beam incidence point from the edge of the wedge 1 is considered when the refraction angle is 45°, and a certain space is reserved to reduce clutter interference. The length of the wedge 1 is the distance L between the front end surface 11 and the rear end surface 12, so the distance between the front end surface 11 and the rear end surface 12 is set to 128mm to 132mm. In addition, the top of the front end surface 11 is provided with a sawtooth groove 111 to reduce the influence of the front end reflection wave on detection.

[0032] Further, the bottom surface of the wedge 1 is an arc surface which effectively matches the inner wall of the connecting weld between the reactor pressure vessel nozzle and the cylinder, avoiding the influence of poor coupling on the ultrasonic testing process. The wedge 1 can be equipped with wear-resistant nails and water injection holes to ensure good coupling effect during detection and reduce wear.

[0033] Preferably, the inclination angle B of the inclined end surface 13 relative to the horizontal surface of the wedge 1 is 7.76°; the vertical distance Z between the reference wafer 22 and the lowest point of the trailing end surface 12 is 237 mm; the horizontal distance Y between the center surface of the reference wafer 22 and the side end surface of the wedge 1 is 20 mm; the horizontal distance M between the reference wafer 22 and the trailing end surface 12 is 5 mm; the height H of the leading end surface 11 is 243 mm; the distance L between the leading end surface 11 and the trailing end surface 12 is 130 mm. In the figure, X is the horizontal distance between the reference wafer 22 and the leading end surface 11, which is 125 mm, and W is the width of the wedge 1, which is twice the horizontal distance Y between the center surface of the reference wafer 22 and the side end surface of the wedge 1, i.e. the width W of the wedge 1 is 40 mm.

[0034] In addition, the number of wafer units 21 is 32, i.e. the number of array elements of the probe 2 is 32, which can provide more data points, making the measurement result more accurate, and enabling good directivity control, high integration and flexibility, and excellent sound source positioning performance. The gap G between each wafer unit 21 is 0.1 mm, and the width E of each wafer unit 21 is 1 mm, which can make the probe 2 have good beam directivity.

[0035] The transceiving mode of the probe 2 is self-transmitting and self-receiving, which means that the probe 2 directly receives the ultrasonic wave signal reflected back by the same probe 2 after transmitting the ultrasonic wave, simplifying the signal processing and reducing the system complexity. The frequency of the probe 2 is 2 MHz or 4 MHz, and the two different frequency probes 2 can perform different detection functions, such as the 2 MHz probe 2 for detecting defects of the connecting weld, and the 4 MHz probe 2 for quantitatively detecting defects of the connecting weld.

[0036] It can be understood that the wedge 1 is designed in size by considering the influence of factors such as the material and specification of the connecting weld between the reactor pressure vessel nozzle and the cylinder, the defect direction, the frequency of the phased array probe, the wave type, the array element size, the effective coverage range of the sound beam, the detection efficiency and the quantitative effect, so that the secondary interface wave appears at a specific position, avoiding interference with the defect wave, thereby avoiding affecting the identification and quantification of defects, and only using the wedge 1 can adapt to different ultrasonic phased array probes 2 to complete the detection and quantification of the connecting weld between the reactor pressure vessel nozzle and the cylinder.

[0037] It can be understood that the above embodiments only express the preferred implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. An ultrasonic phased array detection device for connecting welds, used for detecting the connecting welds between the reactor pressure vessel nozzle and the cylinder, characterized in that: The invention comprises a wedge (1) and a probe (2), wherein the probe (2) comprises a plurality of wafer units (21) arranged in parallel side by side, the wedge (1) having a leading end face (11), a trailing end face (12) and an inclined end face (13), the leading end face (11) and the trailing end face (12) being arranged opposite to each other, the inclined end face (13) being arranged inclined relative to the horizontal plane of the wedge (1), the plurality of wafer units (21) being arranged on the inclined end face (13), and the wafer unit (21) closest to the trailing end face (12) being used as a reference wafer (22); The inclination angle B of the inclined end surface (13) relative to the horizontal plane of the wedge block (1) is 7° to 8°, the vertical distance Z between the lowest point of the reference chip (22) and the trailing end surface (12) is 235mm to 240mm, the horizontal distance Y between the center plane of the reference chip (22) and the side end surface of the wedge block (1) is 18mm to 22mm, the horizontal distance M between the reference chip (22) and the trailing end surface (12) is 4mm to 6mm, and the height H of the leading end surface (11) is 240mm to 245mm.

2. The ultrasonic phased array detection device for connection welds according to claim 1, characterized in that: The inclination angle B of the inclined end surface (13) relative to the horizontal plane of the wedge (1) is 7.76°; The vertical distance Z between the reference wafer (22) and the lowest point of the trailing edge end surface (12) is 237 mm.

3. The ultrasonic phased array detection device for connection welds according to claim 1, characterized in that: The horizontal distance Y between the center plane of the reference wafer (22) and the side end surface of the wedge (1) is 20 mm; The horizontal distance M between the reference wafer (22) and the trailing edge end surface (12) is 5 mm; The height H of the front end surface (11) is 243 mm.

4. The ultrasonic phased array detection device for connection welds according to claim 1, characterized in that: The distance L between the front end surface (11) and the rear end surface (12) is 128 mm to 132 mm.

5. The ultrasonic phased array detection device for connection welds according to claim 1, characterized in that: The number of the wafer units (21) is 32.

6. The ultrasonic phased array detection device for connection welds according to claim 1, characterized in that: The gap G between each of the wafer units (21) is 0.1 mm, and the width E of each of the wafer units (21) is 1 mm.

7. The ultrasonic phased array detection device for connection welds according to claim 1, characterized in that: The bottom surface of the wedge (1) is an arc-shaped surface.

8. The ultrasonic phased array detection device for connection welds according to claim 1, characterized in that: The transceiver mode of the probe (2) is a self-transmitting and self-receiving mode.

9. The ultrasonic phased array detection device for connection welds according to claim 1, characterized in that: The frequency of the probe (2) is 2 MHz or 4 MHz.

10. The ultrasonic phased array detection device for connection welds according to claim 1, characterized in that: A sawtooth groove (111) is provided on the top of the front end surface (11).

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