Measuring device and measuring method for nondestructive testing of fillet weld of nuclear power station

Abstract

The invention relates to the technical field of nuclear power station welding seam detection, in particular to a measuring device and a measuring method for nuclear power station fillet welding seam nondestructive testing, the measuring device comprises a ruler plate, a sliding ruler and a stepped sliding groove, the main body of the ruler plate is a pentagon formed by cutting one corner of a square, and the inclined edge and the adjacent edge of the pentagon are arranged at 135 degrees; two sides, adjacent to the bevel edge, of the ruler plate are provided with stepped sliding grooves, the two stepped sliding grooves are perpendicular to each other in the same plane, the two stepped sliding grooves are in limited sliding connection with two sliding rulers respectively in the length direction, the opposite ends of the two sliding rulers abut against welding corners on the two sides of a T1 or H1 fillet weld respectively, and a marking line is carved at the outer side end of each sliding ruler. The ruler plate is provided with scales at the edges of the two stepped sliding grooves. The invention provides the measuring device and method for measuring the special fillet weld of the nuclear power station.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power plant weld detection, and in particular to a measuring device and a measuring method for nondestructive detection of fillet welds in nuclear power plants. Background Art

[0002] During the construction of Russian standard nuclear power units, the visual non-destructive testing of welds is poor due to the small space and short weld edges, which makes visual non-destructive testing difficult. The Russian standard T1 and H1 weld joint corner welds in the welding areas of the VVER1200 unit of Tianwan Nuclear Power Plant, such as the spent fuel pool, refueling well door frame, and stainless steel water tank, cannot be directly tested using the current HJC40 welding inspection ruler. The HJC40 weld inspection ruler can quickly and conveniently measure the weld readings during conventional weld non-destructive testing, but in some inspection areas and joint forms of Russian standard nuclear power units, the HJC40 welding inspection ruler cannot be used for measurement because the ruler body is too large and there is no inspection space. In addition, the HJC40 ruler has high requirements for the weld margin and requires a larger inspection plane as the reference surface. The actual working conditions on site do not meet the requirements, resulting in the inability to measure. Summary of the invention

[0003] The object of the present invention is to provide a measuring device and a measuring method for non-destructive testing of fillet welds in nuclear power plants, so as to solve the technical problems existing in the above-mentioned background technology.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] A measuring device for nondestructive testing of fillet welds in nuclear power plants, characterized in that it comprises: a ruler, a slide and a stepped chute, the main body of the ruler being a pentagon formed by cutting a corner of a square, the hypotenuse of the pentagon being arranged at 135° to the adjacent sides, two sides of the ruler adjacent to its hypotenuse being arranged on the ruler, the two step chutes being perpendicular to the same plane, the two step chutes being respectively connected with two slides by limited sliding along their length directions, the opposite ends of the two slides respectively abutting against the welding angles on both sides of the T1 or H1 fillet weld, the outer end of the slide being engraved with a marking line, and the ruler being provided with scales at the edges of the two step chutes.

[0006] Furthermore, a threaded hole is provided at the center of the stepped slide groove, a fixing bolt is threadedly connected to the threaded hole, a strip slide groove is provided on the slide rule, and a screw portion of the fixing bolt passes through the strip slide groove.

[0007] Furthermore, the threaded hole is an M2 threaded hole.

[0008] Furthermore, the width of the strip-shaped sliding groove is the same as the diameter of the threaded hole.

[0009] Furthermore, the width and thickness of the slide are the same as the width and thickness of the step slide. When the slide is assembled with the ruler plate, one side of the slide is in close contact with one side of the ruler plate, and the fixing bolt is in close contact with the strip slide.

[0010] Furthermore, one end of the slide ruler that abuts against the weld corner of the T1 or H1 fillet weld is in the shape of a sharp needle with a hypotenuse of 45 degrees. When the two slide rulers are in the storage state, the two slide rulers abut against each other at one end and form a regular quadrilateral.

[0011] Furthermore, the scale has a range of 0 to 15 mm, and when the marking lines on the two slide rulers are aligned with the 0 mark on the corresponding scale, the opposite ends of the two slide rulers are perfectly closed.

[0012] Furthermore, the ruler plate and the slide rule are both made of stainless steel.

[0013] A method for measuring a fillet weld in a nuclear power plant, using the above-mentioned measuring device for non-destructive testing of fillet welds in a nuclear power plant, specifically comprises the following steps:

[0014] When measuring H1 type fillet welds, only a small amount of measurement reference surface space is required; the ruler plate is erected perpendicular to the fillet weld, the X-axis and Y-axis slide working surfaces are respectively extended to the weld toe edges on both sides of the fillet weld and close to each other, and the X-axis and Y-axis slides are vertically in contact with the parent material; then keep the action, tighten the fixing bolts, and pick up the reading, which is the measured weld fillet size;

[0015] When measuring T1 type fillet welds, no external plane space is required; stand the ruler vertically to the fillet weld, extend the working surfaces of the X-axis and Y-axis slide rulers to the edges of the weld toes on both sides of the fillet weld, and make the X-axis and Y-axis slide rulers contact the parent material vertically; then maintain the action, tighten the fixing bolts, pick up the reading, which is the measured weld fillet size.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention aims at measuring fillet welds in narrow spaces, poor detection conditions, dense welds or without measurement boundaries, solves the measurement difficulties and blind spots of special fillet welds of VVER1200 reactor-type nuclear power units, and provides measuring tool support for fillet weld data.

[0018] 2. Its structural design is novel and well-planned. When in use, any two slide rulers are inserted to the edge of the fillet weld toe, and after locking, the reading scale value is observed to quickly calculate the weld angle size. The measurement is accurate and easy to operate, which can significantly improve work efficiency.

[0019] 3. Provide reliable support for test data during quality assurance monitoring and on-site operations.

[0020] 4. During the overhaul of nuclear power units, reduce the use of auxiliary tooling for measuring T1, H1 and other joints when the detection conditions are poor, so as to avoid tool contamination and exceeding the personnel dose limit.

[0021] 5. This fillet weld measuring device can measure the data results on both sides in one detection action, which can increase the detection speed with half the effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an exploded view of the structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the storage and working state of the present invention;

[0024] Figure 3 This is a schematic diagram of measuring the weld angle dimensions of an H1 type fillet weld of the present invention;

[0025] Figure 4 It is a schematic diagram of measuring the weld angle dimensions of a T1 type fillet weld of the present invention.

[0026] The numbers in the attached drawings are: 1-ruler plate, 2-slide rule, 3-fixing bolt, 4-step slide. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] See also Figures 1 to 4 As shown, a measuring device for nondestructive testing of fillet welds in nuclear power plants comprises: a ruler plate 1, a slide ruler 2 and a stepped slide groove 4. The main body of the ruler plate 1 is a pentagon formed by cutting a corner of a square. The hypotenuse of the pentagon is set at 135 degrees with the adjacent sides. The two sides adjacent to the hypotenuse of the ruler plate 1 are provided with a stepped slide groove 4. The two stepped slide grooves 4 are perpendicular to the same plane. The two stepped slide grooves 4 are respectively connected with two slide rulers 2 in limited sliding along their length directions. The opposite ends of the two slide rulers 2 are respectively against the welding angles on both sides of the T1 or H1 fillet weld. A marking line is engraved on the outer end of the slide ruler 2. The range position pointed by the marking line during detection and measurement is the size of the fillet weld angle. The ruler plate 1 is provided with scales at the edges of the two stepped slide grooves 4. The two slide rulers 2 are main working rulers. The extension directions of the two slide rulers 2 are respectively horizontal direction: X direction; vertical direction: Y direction.

[0029] In this embodiment, a threaded hole is provided at the center of the stepped slide 4, and the threaded hole is an M2 threaded hole. A fixing bolt 3 is threadedly connected to the threaded hole, which is used to fix the reading when the slide 2 is measuring; a strip slide is provided on the slide 2, and the screw portion of the fixing bolt 3 passes through the strip slide; the width of the strip slide is the same as the diameter of the threaded hole, and its purpose is to ensure the stability of the slide 2 and reduce the measurement error caused by shaking during measurement.

[0030] In this embodiment, the width and thickness of the slide ruler 2 are the same as the width and thickness of the stepped slide groove 4. When the slide ruler 2 is assembled with the scale plate 1, one side of the slide ruler 2 is tightly attached to one side of the scale plate 1, and the fixing bolt 3 is tightly attached to the strip slide groove. When the slide ruler 2 is extended for measurement, the slide ruler 2 will not cause measurement errors due to the shaking of the slide ruler 2 due to the reduction of the contact area with the scale plate 1.

[0031] In this embodiment, the end of the slide ruler 2 that abuts against the weld corner of the T1 type or H1 type fillet weld is in the shape of a sharp needle with a bevel angle of 45°. When the two slide rulers 2 are in the storage state, the two opposite ends of the slide rulers 2 abut against each other and form a regular quadrilateral; the sharp needle end faces of the slide rulers 2 in the X and Y directions are pushed back to the weld toes at two places of the fillet weld and the boundary with the base material, and after locking the fixing bolts 3, the reading is picked up and the measured weld corner size is obtained.

[0032] In this embodiment, the scale is 0-15 mm in range, and when the marking lines on the two slide rulers 2 are aligned with the 0 mark on the corresponding scale, the opposite ends of the two slide rulers 2 are perfectly closed.

[0033] In this embodiment, the ruler plate 1 and the slide ruler 2 are both made of stainless steel.

[0034] When designing H1-type fillet welds in the spent fuel pool door frame and other parts of the VVER1200 reactor nuclear power unit, there is a problem that the parent material on one side of the two plates is extended too little, making it difficult to form a reference platform for HJC40 weld inspection rulers and other inspection tools to measure;

[0035] When designing T1-type fillet welds for embedded steel bars in the nuclear island of the VVER1200 reactor nuclear power unit, the embedded parts anchoring welds are densely packed, and the traditional weld inspection ruler HJC40 is too large to perform down-to-depth measurement.

[0036] A method for measuring a fillet weld in a nuclear power plant, using a measuring device for nondestructive testing of a fillet weld in a nuclear power plant, specifically comprises the following steps:

[0037] When measuring H1 type fillet welds (such as Figure 3 ), only a small amount of measurement reference surface space is needed; the X-axis slide ruler is extended to the X-axis fillet weld to locate the X-axis fillet weld size, and the Y-axis fillet weld can also be read at the same time, and the fillet weld sizes on both sides can be read with only one measurement action; the specific process is as follows: first, the ruler plate 1 is erected perpendicular to the fillet weld, and the working surfaces of the X-axis and Y-axis slide rulers 2 are respectively extended to the edges of the weld toes on both sides of the fillet weld and close to each other, and the X-axis and Y-axis slide rulers 1 are vertically contacted with the parent material; then the action is maintained, and the fixing bolts 3 are locked and fixed to prevent displacement and erroneous readings, thereby avoiding measurement failure; the reading is the measured weld fillet size;

[0038] When measuring T1 type fillet welds (such as Figure 4), no external plane space is required; the two slides 2 act directly on the weld side, with low space requirements. For this T1-type fillet weld, the two slides 2 are directly pushed to both sides of the weld corner, and the reading measurement can be carried out after being fixed, which is convenient and quick; the specific process is as follows: the ruler plate 1 is erected perpendicular to the fillet weld, the working surfaces of the X-direction and Y-direction slides 2 are respectively extended to the edges of the weld toes on both sides of the fillet weld and close to them, and the X-direction and Y-direction slides 1 are vertically contacted with the parent material; then the action is maintained, and the fixing bolts 3 are locked and fixed to prevent displacement and erroneous readings, thereby avoiding measurement failure; the reading is taken, which is the measured weld corner size.

[0039] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", "top / bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0040] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the profession, without departing from the scope of the technical solution of the present invention, according to the technical essence of the present invention, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the present invention.

Claims

1. A measuring device for nondestructive testing of fillet welds in nuclear power plants, characterized in that: include: A ruler (1), a slide ruler (2) and a step slide groove (4), wherein the main body of the ruler (1) is a pentagon formed by cutting one corner of a square, the hypotenuse of the pentagon is set at 135 degrees to the adjacent side, the two sides of the ruler (1) adjacent to its hypotenuse are each provided with a step slide groove (4), the two step slide grooves (4) are perpendicular to the same plane, the two step slide grooves (4) are respectively connected to two slide rulers (2) in a limited sliding manner along their length direction, the opposite ends of the two slide rulers (2) are respectively against the welding corners on both sides of the T1 or H1 fillet weld, the outer end of the slide ruler (2) is engraved with a marking line, and the ruler (1) is provided with scales at the edges of the two step slide grooves (4).

2. A measuring device for nondestructive testing of fillet welds in a nuclear power plant according to claim 1, characterized in that: A threaded hole is provided at the center of the stepped slide groove (4), a fixing bolt (3) is threadedly connected to the threaded hole, a strip-shaped slide groove is provided on the slide ruler (2), and the screw portion of the fixing bolt (3) passes through the strip-shaped slide groove.

3. A measuring device for nondestructive testing of fillet welds in a nuclear power plant according to claim 2, characterized in that: The threaded hole is an M2 threaded hole.

4. A measuring device for nondestructive testing of fillet welds in nuclear power plants according to claim 3, characterized in that: The width of the strip-shaped sliding groove is the same as the diameter of the threaded hole.

5. A measuring device for nondestructive testing of fillet welds in a nuclear power plant according to claim 4, characterized in that: The width and thickness of the slide ruler (2) are the same as the width and thickness of the step slide groove (4). When the slide ruler (2) and the ruler plate (1) are assembled, one side of the slide ruler (2) is tightly attached to one side of the ruler plate (1), and the fixing bolt (3) is tightly attached to the strip slide groove.

6. A measuring device for nondestructive testing of fillet welds in a nuclear power plant according to claim 5, characterized in that: The end of the slide ruler (2) that butts against the weld corner of the T1-type or H1-type fillet weld is in the shape of a sharp needle with a 45° bevel. When the two slide rulers (2) are in the storage state, the opposite ends of the two slide rulers (2) butt against each other and form a regular quadrilateral.

7. A measuring device for nondestructive testing of fillet welds in nuclear power plants according to claim 6, characterized in that: The scale has a range of 0 to 15 mm. When the marking lines on the two slide rulers (2) are aligned with the 0 mark on the corresponding scale, the opposite ends of the two slide rulers (2) are perfectly closed.

8. The measuring device for nondestructive testing of fillet welds in nuclear power plants according to claim 1, characterized in that: The ruler plate (1) and the slide ruler (2) are both made of stainless steel.

9. A method for measuring fillet welds in a nuclear power plant, using a measuring device for nondestructive testing of fillet welds in a nuclear power plant according to any one of claims 1 to 8, characterized in that: The specific steps include: When measuring an H1 type fillet weld, only a small amount of measuring reference surface space is required; the ruler plate (1) is erected perpendicular to the fillet weld, the working surfaces of the X-axis and Y-axis slide rulers (2) are respectively extended to the edges of the weld toes on both sides of the fillet weld and closely attached, and the X-axis and Y-axis slide rulers (1) are brought into perpendicular contact with the parent material; then the action is maintained, the fixing bolts (3) are tightened, and the reading is taken, which is the measured fillet size; When measuring a T1 type fillet weld, no external plane space is required; the ruler plate (1) is erected perpendicular to the fillet weld, the working surfaces of the X-axis and Y-axis slide rulers (2) are respectively extended to the edges of the weld toes on both sides of the fillet weld and closely attached, and the X-axis and Y-axis slide rulers (1) are brought into vertical contact with the parent material; then the action is maintained, the fixing bolts (3) are tightened, and the reading is taken, which is the measured weld fillet size.

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