Attachment weld ultrasonic phased array detection device

Abstract

The invention discloses an ultrasonic phased array detection device for an attachment welding seam, which is used for detecting the attachment welding seam between a reactor pressure vessel connecting pipe and a barrel body and comprises a wedge block and a probe, according to the ultrasonic phased array detection device for the attachment weld, the wedge block is subjected to size design through the influence of factors such as the material and specification of the attachment weld between a reactor pressure vessel connecting pipe and a barrel, the defect direction, the phased array probe frequency, the wave form, the array element size, the effective acoustic beam coverage range, the detection efficiency and the quantitative effect; according to the wedge block, secondary interface waves appear at a specific position, interference to defect waves is avoided, so that the influence on defect identification and quantification is avoided, and the wedge block can be adapted to different ultrasonic phased array probes to complete detection and quantification work of the connecting weld of the reactor pressure vessel connecting pipe and the barrel.

Description

Technical Field

[0001] The invention relates to the field of phased array ultrasonic detection, and in particular to an ultrasonic phased array detection device for connecting welds. Background Art

[0002] The reactor pressure vessel (RPV) is a core component of a nuclear power unit. The inlet and outlet pipes and the cylinder connection welds of this component are welded by insert welding. It has a saddle surface structure, a relatively complex structure, and a thick weld. Manufacturing defects may occur during the manufacturing stage. Under long-term high temperature, high pressure, and high radiation service conditions, the defects in the welds may expand and change, causing a significant impact on the pressure-bearing capacity of the equipment. In order to detect dangerous defects in the welds as early as possible, it is necessary to perform ultrasonic testing on them regularly, thereby maintaining and ensuring the safe operation of nuclear power facilities.

[0003] At present, automatic inspection equipment equipped with ultrasonic phased array inspection technology is used to inspect the welds connecting the inlet and outlet pipes and the cylinder of the reactor pressure vessel. This technology is a new technology developed on the basis of the original conventional ultrasonic inspection technology. It is a special ultrasonic inspection technology that uses precise and complex phased arrays and powerful software to control the ultrasonic beam to cover the material being inspected and generate a corrected image of the internal structure of the material.

[0004] The ultrasonic phased array inspection of the welds connecting the inlet and outlet pipes of the reactor pressure vessel and the cylinder is carried out by the automatic inspection equipment driving the ultrasonic probe to inspect from the inner surface of the pipe. The wedges of the phased array probes used in the existing ultrasonic inspection technology are relatively thin, and the ultrasonic energy attenuation of multiple interface waves (reflected waves between the wedges and the inspection surface) and their waveform conversion is small, and the sound path range is large, which interferes with the identification and quantification of defects. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an ultrasonic phased array detection device for connecting welds.

[0006] The technical solution adopted by the present invention to solve the technical problem is: constructing a connection weld ultrasonic phased array detection device for detecting the connection weld between the reactor pressure vessel pipe and the cylinder, which comprises a wedge and a probe, the probe comprises a plurality of wafer units arranged in parallel, the wedge has a front end face, a rear end face and an inclined end face, the front end face is arranged opposite to the rear end face, the inclined end face is arranged inclined relative to the horizontal plane of the wedge, a plurality of wafer units are arranged on the inclined end face, and the wafer unit closest to the rear end face is used as the reference wafer;

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

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

[0009] The vertical distance Z between the reference wafer and the lowest point of the trailing edge end surface is 237 mm.

[0010] In some embodiments, the horizontal distance Y between the center plane of the reference wafer and the side end surface of the wedge is 20 mm;

[0011] The horizontal distance M between the reference wafer and the trailing edge end surface is 5 mm;

[0012] The height H of the front end surface is 243 mm.

[0013] In some embodiments, the distance L between the leading end surface and the trailing end surface is 128 mm to 132 mm.

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

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

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

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

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

[0019] In some embodiments, a serrated groove is provided on the top of the leading end surface.

[0020] The implementation of the present invention has the following beneficial effects: the wedge block is designed in size based on 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 phased array probe frequency, the waveform, 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 to avoid interference with the defect wave, thereby avoiding affecting the identification and quantification of the defect. Only the wedge block can be used to adapt 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 THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work. In the drawings:

[0022] Figure 1 is a schematic diagram of the three-dimensional structure of a connection weld ultrasonic phased array detection device in some embodiments of the present invention;

[0023] Figure 2 is a schematic diagram of the three-dimensional structure of the ultrasonic phased array detection device for connecting welds in some embodiments of the present invention in another direction;

[0024] Figure 3 1 is a schematic diagram of the top view of the structure of the ultrasonic phased array detection device for connecting welds in some embodiments of the present invention. DETAILED DESCRIPTION

[0025] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0026] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0027] See also Figures 1 to 3 The present invention discloses a connection weld ultrasonic phased array detection device, which is used for detecting the connection weld between the reactor pressure vessel pipe and the cylinder. In this embodiment, the base material of the connection weld between the reactor pressure vessel pipe and the cylinder is manganese-nickel-molybdenum alloy steel, the material of the filler metal is a stainless steel welding rod, and the weld thickness is 234mm. The weld position is about 393.5mm from the inner surface of the pipe probe scanning surface in the depth direction, and the stainless steel cladding layer is 6mm thick.

[0028] The ultrasonic phased array detection device for connecting welds 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 comprises a front end face 11, a rear end face 12 and an inclined end face 13, wherein the front end face 11 is arranged opposite to the rear end face 12, the inclined end face 13 is arranged inclined relative to the horizontal plane of the wedge 1, and a plurality of wafer units 21 are arranged on the inclined end face 13, and the wafer unit 21 closest to the rear end face 12 is used as the reference wafer 22. The inclination angle B of the inclined end face 13 relative to the horizontal plane of the wedge 1 is 7° to 8°, the vertical distance Z between the reference wafer 22 and the lowest point of the rear end face 12 is 235mm to 240mm, the horizontal distance Y between the center plane of the reference wafer 22 and the side end face of the wedge 1 is 18mm to 22mm, the horizontal distance M between the reference wafer 22 and the rear end face 12 is 4mm to 6mm, and the height H of the front end face 11 is 240mm to 245mm.

[0029] The height of the front end face 11 is greater than the rear end face 12, the front end face 11 is arranged in parallel with the rear end face 12, and the front end face 11 and the rear end face 12 are arranged perpendicular to the side end face of the wedge 1. In this embodiment, in order to meet the requirement of covering the entire inspection area of ​​the connecting weld, the sound velocity angle range is 0° to 45°, and considering the coordination of the electronic scanning angle, the longitudinal wave refraction angle used by the wedge 1 is preferably 20°.

[0030] According to Snell's formula: Where: C1 is the wedge sound velocity, which is 2337m / s, and C2 is the sound velocity of the steel workpiece being tested, which is 5920m / s. The longitudinal wave refraction angle α2 of the wedge is 20°, so the wedge sound beam incident angle α1 is 7.76°. The wedge 1 sound beam incident angle is the inclination angle B of the inclined end face 13 relative to the horizontal plane of the wedge 1. The thickness design of the wedge 1 needs to ensure that the weld position echo falls between the primary interface echo and the secondary interface echo of the wedge 1, and the sound path S of the most central chip unit 21 in the probe 2 should satisfy S' is the sound path of the sound beam at different angles in the inspected workpiece. The sound path range of the 0°~45° sound beam at a depth of 400mm is about 400mm to 565mm. The sound path value of the 45° sound beam is the largest, that is, when the 45° sound beam meets the requirements, the entire sound beam range will meet the requirements. Through calculation, it can be known that the minimum value of S is 223mm. Since the angle corresponding to the 45° sound beam in the wedge block 1 is 16.2°, it is calculated that the minimum height of the most central chip unit 21 from the bottom surface of the wedge block 1 is 223xcos16.2°=214mm. According to the minimum height of the most central chip unit 21 from the bottom surface of the wedge block 1, a reference is made to determine the vertical distance Z between the reference chip 22 and the lowest point of the trailing edge end face 12, so the vertical distance Z between the reference chip 22 and the lowest point of the trailing edge end face 12 is set to 235mm to 240mm, and also a reference is made for the thickness of the wedge block 1, which is the height H of the front end face 11.

[0031] When determining the length of the wedge 1, it is necessary to consider the distance between the incident point of the sound beam of the edge chip unit 21 and the edge of the wedge 1 when the refraction angle is 45° and reserve a certain space to reduce clutter interference. The length of the wedge 1 is the distance L between the front end face 11 and the rear end face 12, so the distance between the front end face 11 and the rear end face 12 is set to 128mm to 132mm. In addition, a sawtooth groove 111 is provided on the top of the front end face 11 to reduce the influence of the front end reflection wave on the detection.

[0032] Furthermore, the bottom surface of the wedge block 1 is an arc surface, which effectively fits the inner wall of the reactor pressure vessel pipe to avoid the influence of poor coupling on the ultrasonic detection process. The wedge block 1 can be equipped with anti-wear nails and water injection holes to ensure good coupling effect during the detection process while reducing wear.

[0033] Preferably, 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 lowest point of the reference wafer 22 and the trailing end surface 12 is 237mm; the horizontal distance Y between the center plane of the reference wafer 22 and the side end surface of the wedge 1 is 20mm; the horizontal distance M between the reference wafer 22 and the trailing end surface 12 is 5mm; the height H of the front end surface 11 is 243mm; the distance L between the front end surface 11 and the trailing end surface 12 is 130mm. In the figure, X is the horizontal distance between the reference wafer 22 and the front end surface 11, which is 125mm, and W is the width of the wedge 1. The vertical width W of the wedge 1 is twice the horizontal distance Y between the center plane of the reference wafer 22 and the side end surface of the wedge 1, that is, the width W of the wedge 1 is 40mm.

[0034] In addition, the number of the chip units 21 is 32, that is, the number of array elements of the probe 2 is 32, which can provide more data points, so that the measurement results are more accurate, and can have good pattern control, high integration and flexibility, and excellent sound source localization performance. Among them, the gap G between each chip unit 21 is 0.1mm, and the width E of each chip unit 21 is 1mm, which can make the probe 2 have better beam directivity.

[0035] The transceiver mode of probe 2 is a self-transmitting and self-receiving mode. The self-transmitting and self-receiving mode of probe 2 means that after the probe 2 transmits the ultrasonic wave, it directly receives the ultrasonic wave signal reflected by the same probe 2, which simplifies the signal processing and reduces the system complexity. The frequency of probe 2 is 2MHz or 4MHz. The two different frequencies of probes 2 can perform different detection functions. For example, the 2MHz probe 2 can detect the defects of the connecting weld, and the 4MHz probe 2 can quantify the defects of the connecting weld.

[0036] It can be understood that the wedge block 1 is designed in size based on 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 phased array probe frequency, the waveform, 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 to avoid interference with the defect wave, thereby avoiding affecting the identification and quantification of the defect. Only the wedge block 1 can be used to adapt 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 modes 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, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the scope covered by the claims of the present invention.

Claims

1. A connection weld ultrasonic phased array detection device, used for detecting the connection weld 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 and side by side, the wedge (1) having a front end face (11), a rear end face (12) and an inclined end face (13), the front end face (11) being arranged opposite to the rear end face (12), the inclined end face (13) being arranged inclined relative to a 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 rear end face (12) being 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 connecting 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 block (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 connecting 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 block (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 connecting 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 connecting welds according to claim 1, characterized in that: The number of the chip units (21) is 32.

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

8. The ultrasonic phased array detection device for connecting 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 connecting 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 connecting 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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