Welding device and method for support hardware

Abstract

To provide a welding device and method for a support hardware that improves workability in welding of a support hardware to a support pole.SOLUTION: A welding device for a support hardware welds a lower end part of a cylindrical support hardware to an upper end part of a support pole on which a cylindrical latch for supporting a thermocouple outlet pipe inside the upper end part is mounted. The device includes: a frame arranged around the support pole; a holding device arranged on the frame and capable of holding the support pole; a rotary table supported such that it is rotatable around the axis of the support pole relative to the frame; a welder mounted on the rotary table; and a measuring instrument mounted on the rotary table and measuring a levelness of a horizontal plane of the support hardware relative to the support pole.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a support metal welding apparatus and method for welding a support metal to a support pole. [Background technology]

[0002] In a nuclear power plant, a containment vessel is erected on solid ground such as bedrock, and a nuclear reactor is disposed inside the containment vessel. The reactor is configured by disposing reactor internals such as fuel inside the reactor vessel. As the reactor internals, a plurality of tubular thermocouple withdrawal pipe support columns are disposed between an upper core support plate and the upper core plate. Tubular support metal fittings are connected to the upper ends of the thermocouple withdrawal pipe support columns. Thermocouple withdrawal pipes are disposed inside the thermocouple withdrawal pipe support columns and the support metal fittings. The lower ends of the support metal fittings are connected to the upper ends of the thermocouple withdrawal pipe support columns by welding. A technology for welding such reactor internals is disclosed, for example, in Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-53553 Summary of the Invention [Problem to be solved by the invention]

[0004] The thermocouple lead pipe support column has a stopper attached to the inside of its upper end to support the thermocouple lead pipe. The lower end of the support metal is welded to the upper end of the thermocouple lead pipe support column with the stopper attached. First, the support metal is positioned at the welding position relative to the upper end of the thermocouple lead pipe support column with the stopper attached. At this time, the lower end surface of the support metal contacts the upper end surface of the thermocouple lead pipe support column, and the lower end is fitted into the upper end of the stopper. In this state, the joint between the thermocouple lead pipe support column and the support metal is welded. However, during welding, thermal distortion occurs at the joint, causing the support metal to tilt relative to the thermocouple lead pipe support column. As a result, the welding work must be performed repeatedly, and the tilt of the support metal must be measured using a dial gauge, which results in a long welding time.

[0005] The present disclosure is intended to solve the above-mentioned problems, and aims to provide a support metal welding device and method that improves workability in welding support metal to support columns. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the welding device for support hardware of the present disclosure welds the lower end of a cylindrical support hardware to the upper end of a cylindrical support pillar having a stopper attached to the inside of its upper end that supports a thermocouple withdrawal tube, and comprises: a stand arranged around the support pillar; a holding device arranged on the stand and capable of holding the support pillar; a rotating table supported on the stand so as to be rotatable around the axis of the support pillar; a welding machine attached to the rotating table; and a measuring instrument attached to the rotating table that measures the levelness of the horizontal surface of the support hardware relative to the support pillar.

[0007] In addition, the welding method for support hardware disclosed herein is a method for welding a cylindrical support hardware to the upper end of a cylindrical support hardware having a stopper attached to the inside of its upper end that supports a thermocouple withdrawal tube, and includes the steps of performing a plurality of temporary welds at positions spaced apart circumferentially from the joint between the support hardware and the support hardware, setting the next temporary weld position based on the measurement results obtained by measuring the levelness of the horizontal surface of the support hardware relative to the support hardware each time the temporary weld is performed, performing main welding in a plurality of circumferential regions centered on the temporary weld position after the temporary welding is completed, and setting the next main welding position based on the measurement results obtained by measuring the levelness of the horizontal surface of the support hardware relative to the support hardware each time the main welding is performed. [Effects of the Invention]

[0008] According to the support metal welding device and method disclosed herein, it is possible to improve the workability of welding support metal to a support column. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a longitudinal cross-sectional view showing a pressurized water reactor. [Figure 2] FIG. 2 is a schematic cross-sectional view showing the connection structure between the support column, the stopper plate, and the support metal fitting. [Figure 3] FIG. 3 is a schematic front view showing a welding device for a support metal fitting. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3, showing a welding device for the support metal fittings. [Figure 5] FIG. 5 is a schematic diagram showing a welding method for the support metal of this embodiment. [Figure 6] FIG. 6 is a schematic diagram showing a method for welding the support metal fittings. [Figure 7] FIG. 7 is a schematic diagram showing a method for welding the support metal fittings. [Figure 8] FIG. 8 is a schematic diagram showing a method for welding the support metal fittings. DETAILED DESCRIPTION OF THE INVENTION

[0010] Preferred embodiments of the present disclosure will be described in detail below with reference to the drawings. Note that the present disclosure is not limited to these embodiments, and when there are multiple embodiments, the present disclosure also includes configurations that combine the embodiments. Furthermore, the components in the embodiments include those that can be easily imagined by a person skilled in the art, those that are substantially identical, and those that are within the so-called equivalent range.

[0011] <Pressurized water reactor> FIG. 1 is a longitudinal cross-sectional view showing a pressurized water reactor.

[0012] Although not shown, the nuclear power plant has a nuclear reactor and a steam generator arranged in a reactor containment vessel, and a steam turbine power generation facility. The nuclear reactor in this embodiment is a pressurized water reactor (PWR). However, the nuclear reactor may be any type of nuclear reactor, such as a boiling water reactor (BWR) or a fast breeder reactor (FBR).

[0013] As shown in FIG. 1, in a pressurized water reactor 10, a reactor vessel 11 is composed of a reactor vessel main body 12 and a reactor vessel lid 13 attached to the top so that reactor internals can be inserted inside, and the reactor vessel lid 13 is fixed to the reactor vessel main body 12 by a plurality of stud bolts 14 and nuts 15 so that it can be opened and closed.

[0014] The reactor vessel body 12 has a cylindrical shape that is open at the top and closed at the bottom, forming a hemispherical shape, and is provided with an inlet nozzle 16 at the top for supplying light water as primary coolant and an outlet nozzle 17 for discharging the light water. A core barrel 18 is disposed inside the reactor vessel body 12, and its upper part is supported by the inner wall surface of the reactor vessel body 12. An upper core support plate 19 is disposed inside the reactor vessel body 12, and its upper part is supported by the upper part of the core barrel 18. An upper core plate 20 is suspended and supported from the upper core support plate 19 by a plurality of core support rods 21.

[0015] A lower core support plate 22 is supported below the core barrel 18, and the outer periphery of the lower core support plate 22 is positioned and supported by positioning members 23 on the inner wall surface of the reactor vessel body 12. A lower core plate 24 is supported below the core barrel 18. A core 25 is formed by arranging a large number of fuel assemblies 26, and a large number of control rods 27 are arranged inside, and the control rods 27 are insertable into the fuel assemblies 26. A large number of control rod cluster guide tubes 28 are fixed to the upper core support plate 19, and the control rods 27 can be inserted therein. The reactor vessel lid 13 is hemispherical, and a control rod drive mechanism 29 is arranged therein. A plurality of control rod cluster drive shafts 30 are inserted into the control rod cluster guide tubes 28, and the control rods 27 are connected to the lower ends thereof. The control rod drive mechanism 29 controls the reactor power by inserting and withdrawing each control rod 27 into and from the core 25.

[0016] Furthermore, a detector guide device 31 is disposed inside the reactor vessel 11. The detector guide device 31 guides a neutron flux detector (not shown) from an instrumentation nozzle 32 on the reactor vessel lid 13 to the core 25 (fuel assemblies 26) through a guide member 33. The neutron flux detector can measure the neutron level and distribution (neutron flux). Specifically, the detector guide device 31 guides the neutron flux detector (not shown) from the instrumentation nozzle 32 on the reactor vessel lid 13 to the core 25 (fuel assemblies 26) through the guide member 33 and a guide thimble (not shown) fixed to the lower end of the guide member 33.

[0017] <Connection structure between support column, stopper plate and support hardware> FIG. 2 is a schematic cross-sectional view showing the connection structure between the support column, the stopper plate, and the support metal fitting.

[0018] As shown in Figures 1 and 2, the support column (thermocouple withdrawal pipe support column) 51 has a cylindrical shape, and its lower end is supported by the upper core support plate 19. The support column 51 has a support portion 51a formed on the inside of its upper end, where the inner diameter is larger. The support hardware 52 has a cylindrical shape, and its upper end is supported by the reactor vessel lid 13. An upper end surface 51b of the support column 51 and a lower end surface 52a of the support hardware 52 are in contact with each other and are joined by a welded portion 54. The outer diameter and inner diameter of the upper end of the support column 51 are the same as those of the lower end of the support hardware 52.

[0019] The stopper plate 53 has a cylindrical shape and is attached to and supported by the support portion 51a at the upper end of the support column 51. The stopper plate 53 supports the upper end of the lower thermocouple lead pipe 56 and also supports the lower end of the upper thermocouple lead pipe 57. That is, the upper end of the lower thermocouple lead pipe 56 is supported by penetrating the stopper plate from below. The lower end of the upper thermocouple lead pipe 57 is supported by the stopper plate 53. The upper end of the lower thermocouple lead pipe 56 and the lower end of the upper thermocouple lead pipe 57 are supported by the stopper plate 53 and communicate with each other. The lower thermocouple lead pipe 56 and the upper thermocouple lead pipe 57 movably support thermocouples (not shown) therein.

[0020] <Support metal welding equipment> FIG. 3 is a schematic front view showing the welding device for the support metal, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3 showing the welding device for the support metal.

[0021] As shown in Figures 3 and 4, a welding device for support metal (hereinafter referred to as welding device) 60 welds the lower end of support metal 52 to the upper end of support column 51, which has a stopper 53 attached to the inside of the upper end to support the thermocouple lead-out tube.

[0022] The welding device 60 includes a stand 61 , a holding device 62 , a rotating table 63 , a welding machine 64 , and a measuring instrument 65 .

[0023] The mount 61 is arranged around the support column 51. The mount 61 has a disk shape. A cutout 71 is provided from the center to the outer periphery of the mount 61, so that the mount 61 has a U-shape in plan view. When the mount 61 is arranged around the support column 51, the center (axis center O) of the mount 61 and the center (axis center O) of the support column 51 coincide with each other, and the support column 51 is located inside the cutout 71.

[0024] The holding device 62 is disposed on the base 61. The holding device 62 is capable of holding the support column 51 from the outside. The holding device 62 has a pair of drive devices (e.g., fluid pressure cylinders) 72. The pair of drive devices 72 are disposed at positions that face each other in the radial direction of the support column 51. That is, the pair of drive devices 72 are positioned facing each other on a horizontal line that passes through the axis O in the radial direction. The pair of drive devices 72 are configured by attaching holding members 73 to the tip ends of drive rods. The pair of hold members 73 have, for example, a curved shape that matches the outer circumferential surface of the support column 51.

[0025] When the pair of drive devices 72 are operated to contract the drive rods, each holding member 73 moves away from the outer circumferential surface of the support column 51, and the holding devices 62 release the support column 51. On the other hand, when the pair of drive devices 72 are operated to extend the drive rods, each holding member 73 comes into contact with and presses against the outer circumferential surface of the support column 51, and the holding devices 62 hold the support column 51. In other words, the support column 51 has its lower end supported by the upper core support plate 19 (see FIG. 1 ), and the support column 51 is held by the holding devices 62, so that the cradle 61 is held relative to the support column 51.

[0026] The rotating table 63 is supported on the base 61 so as to be rotatable around the axis O of the support column 51. The rotating table 63 is configured by connecting an upper table 74 and a lower table 75 with a plurality of connecting rods 76. The upper table 74 and the lower table 75 have substantially the same shape as the base 61. A ring-shaped guide rail 77 is fixed to the upper surface of the base 61. Meanwhile, the rotating table 63 has a guide member 78 fixed to the lower surface of the lower table 75. The guide member 78 of the rotating table 63 is movably fitted into the guide rail 77 of the base 61.

[0027] The rotating table 63 can be rotated relative to the base 61 by a driving device (for example, a driving motor) 79. The driving device 79 is mounted on a lower table 75 of the rotating table 63, and a driving gear 80 is attached to a drive shaft extending downward. Meanwhile, a ring-shaped rack 81 is fixed to the upper surface of the base 61. The driving gear 80 of the driving device 79 meshes with the rack 81 of the base 61. Therefore, when the driving device 79 is driven, the driving gear 80 rotates while meshing with the rack 81, and the rotating table 63 rotates relative to the base 61.

[0028] The welding machine 64 and the measuring device 65 are mounted on the rotating table 63. A support table 82 is disposed between the upper table 74 and the lower table 75, and the support table 82 is supported on the lower table 75 by support rods 83. The welding machine 64 is supported on the underside of the support table 82 via a lower bracket 84, and the measuring device 65 is supported on the upper side of the support table 82 via an upper bracket 85. The welding machine 64 and the measuring device 65 may be supported on the rotating table 63 so as to be movable vertically.

[0029] The welding machine 64 is supported in the horizontal direction, and at least the torch portion is supported so as to be freely movable relative to the axis O of the support column 51. The measuring instrument 65 is supported in a direction inclined at a predetermined angle relative to the horizontal and vertical directions, and is supported so as to be freely movable relative to the axis O of the support column 51. The welding machine 64 and the measuring instrument 65 are arranged at positions offset from each other in the circumferential direction. In this embodiment, the welding machine 64 and the measuring instrument 65 are arranged at positions offset from each other in the circumferential direction by 90 degrees about the axis O, but this is not limited to 90 degrees and may be, for example, approximately 30 degrees or approximately 180 degrees. In other words, the welding machine 64 and the measuring instrument 65 need not be arranged at positions that overlap each other in the circumferential direction.

[0030] The welding machine 64 welds the joint between the upper end of the support column 51 and the lower end of the support metal fitting 52. A laser welding machine, a TIG welding machine, an arc welding machine, or the like is used as the welding machine 64. The measuring instrument 65 measures the levelness of the horizontal surface of the outer periphery of the support metal fitting 52 relative to the support column 51. The support metal fitting 52 has a horizontal surface 52b on its outer periphery. The measuring instrument 65 is a laser displacement meter that measures the distance to the horizontal surface 52b and measures the levelness of the horizontal surface 52b of the support metal fitting 52 relative to the support column 51 based on a plurality of measured distances to the horizontal surface 52b at different positions.

[0031] The position of the measuring instrument 65 is not limited to the position described above. The measuring instrument 65 may be placed vertically above the horizontal surface 52b of the support metal 52. Furthermore, laser light from the measuring instrument 65 may be reflected by a reflector and projected onto the horizontal surface 52b. The measuring instrument 65 may also measure a portion of the support metal 52 other than the horizontal surface 52b. Furthermore, a plurality of welding machines 64 and measuring instruments 65 may be provided. The measuring instrument 65 is not limited to one having a laser displacement meter.

[0032] <Support metal welding method> 5 to 8 are schematic diagrams showing a welding method for the support metal fittings of this embodiment, in which (a) is a plan view and (b) is a front view.

[0033] 3 and 4, the support column 51 to which the stopper plate 53 is attached is supported and arranged at a predetermined position. First, the support metal fitting 52 is transported by a crane (not shown) and arranged on the upper end of the support column 51. At this time, the lower end surface of the support metal fitting 52 contacts the upper end surface of the support column 51, and the lower end is simply fitted into the stopper plate 53, and the support metal fitting 52 is not supported by a separate member. Furthermore, the support metal fitting 52 is arranged along the vertical direction relative to the support column 51. In this case, the measuring instrument 65 may measure the levelness of the horizontal surface 52b of the support metal fitting 52 at multiple points.

[0034] Next, the welding device 50 is transported by the crane device, placed around the support column 51 and the support metal 52, and positioned in a predetermined position. The predetermined position of the welding device 50 relative to the support column 51 and the support metal 52 is a position (height) where the welding machine 64 faces the joint between the support column 51 and the support metal 52. Here, the drive device 72 of the holding device 62 is operated to extend the drive rod and move the holding member 73 forward, thereby holding the support column 51. By operating the holding device 62, the welding device 50 is held by the support column 51, and the crane device is retracted.

[0035] Once the welding device 50 is attached to the support column 51, tack welding is performed using the welding device 50. First, the drive device 79 is driven to rotate the rotating table 63 relative to the base 61, and the welding machine 64 mounted on the rotating table 63 is moved to a predetermined tack welding position. In this embodiment, tack welding is performed at four locations circumferentially spaced apart from one another at the joint between the support column 51 and the support metal 52. However, the number of tack welding locations is not limited to four. As shown in FIG. 5 , the welding machine 64 is moved to a position corresponding to a first tack welding position P1 circumferentially at the joint between the support column 51 and the support metal 52. Then, the welding machine 64 is operated to perform tack welding at the first tack welding position P1.

[0036] When the welding machine 64 performs pre-welding at the first pre-welding position P1, the first pre-welding position P1 may be deformed by the heat of the welding, causing the upper part of the support metal fitting 52 to tip over relative to the support column 51. Therefore, the level of the horizontal surface 52b of the support metal fitting 52 is measured using a measuring instrument 65. The turntable 63 (see FIG. 4) is rotated, and the measuring instrument 65 is moved to measure the level of the horizontal surface 52b. The level of the horizontal surface 52b is measured multiple times at intervals in the circumferential direction. Then, the second pre-welding position P2 is set based on the level of the support metal fitting 52 measured by the measuring instrument 65.

[0037] In this embodiment, for example, it is assumed that deformation occurs in which the upper part of the support metal 52 falls toward the first pre-welding position P1 relative to the support column 51. In this case, the second pre-welding position P2 is set to a position opposite the first pre-welding position P1, that is, a position 180 degrees circumferentially shifted from the first pre-welding position P1. As shown in FIG. 6 , the welding machine 64 is moved in the circumferential direction of the support column 51 and the support metal 52 to a position opposite the second pre-welding position P2. Then, the welding machine 64 is operated to perform pre-welding at the second pre-welding position P2.

[0038] When the welding machine 64 performs tack welding at the second tack welding position P2, the second tack welding position P2 is deformed by the heat of the welding, causing deformation in which the upper part of the support metal 52 tilts relative to the support column 51. Here, too, the level of the horizontal surface 52b of the support metal 52 is measured by the measuring instrument 65. Then, the third tack welding position P3 is set based on the level of the support metal 52 measured by the measuring instrument 65. In this case, because tack welding is performed at four locations, the third tack welding position P3 is a position shifted to one side in the circumferential direction from the second tack welding position P2 or a position shifted to the other side in the circumferential direction from the second tack welding position P2, and is set depending on the direction in which the upper part of the support metal 52 tilts relative to the support column 51.

[0039] In this embodiment, for example, because deformation has occurred in which the upper part of the support metal 52 has fallen toward the fourth pre-welding position P4 relative to the support column 51, the third pre-welding position P3 is set at a position shifted 90 degrees to one side from the second pre-welding position P2. The welding machine 64 is moved in the circumferential direction of the support column 51 and the support metal 52 to a position facing the third pre-welding position P3. At this point, the welding machine 64 is operated to perform pre-welding at the third pre-welding position P3. The welding machine 64 is then moved in the circumferential direction of the support column 51 and the support metal 52 to a position facing the fourth pre-welding position P4. At this point, the welding machine 64 is operated to perform pre-welding at the fourth pre-welding position P4.

[0040] Once the preliminary welding work is completed, the actual welding work is performed using the welding device 50. First, the welding machine 64 is moved to a predetermined actual welding position. In this embodiment, the actual welding is performed in four circumferential regions centered on the preliminary welding positions P1, P2, P3, and P4 between the support column 51 and the support hardware 52. That is, as shown in FIG. 7, the level of the horizontal surface 52b of the support hardware 52 is measured by the measuring device 65. Then, a first actual welding region P11 is set based on the level of the support hardware 52 measured by the measuring device 65.

[0041] In this embodiment, for example, because deformation has occurred in which the upper part of the support metal 52 has fallen toward the fourth pre-welding position P4 relative to the support column 51, the first main welding region P11 is set to a circumferential region (e.g., 90 degrees) centered on the third pre-welding position P3. The welding machine 64 is moved in the circumferential direction of the support column 51 and the support metal 52 to a position facing the end of the first main welding region P11. The welding machine 64 is then operated and moved in the circumferential direction to perform main welding on the first main welding region P11. Note that the movement direction of the welding machine 64 may be selected to be either clockwise or counterclockwise depending on the tilt direction of the support metal 52 relative to the support column 51.

[0042] When welding machine 64 performs main welding on first temporary welding position P1, first main welding area P11 may be deformed by the heat of the welding, causing the upper part of support metal 52 to tip over relative to support column 51. Therefore, as with the temporary welding operation, measuring device 65 measures the level of horizontal surface 52b of support metal 52 at multiple locations. Then, second main welding area P12 is set based on the level of support metal 52 measured by measuring device 65. Then, after main welding is performed on second main welding area P12, measurement work is performed on support metal 52, and similar welding work is then performed on third main welding area P13 and fourth main welding area P14.

[0043] Note that the main welding work may be performed in one layer, but is preferably performed in two layers, using welding device 60. As shown in Fig. 8, when welding work of the joint between support column 51 and support metal fitting 52 is completed using welding device 60, the upper end of support column 51 and the lower end of support metal fitting 52 are connected by welded portion 54.

[0044] [Effects of this embodiment] The welding apparatus for a support metal fitting according to the first embodiment comprises a stand 61 arranged around the support column 51, a holding device 62 arranged on the stand 61 and capable of holding the support column 51, a rotating table 63 supported on the stand 61 so as to be rotatable around the axis O of the support column 51, a welding machine 64 attached to the rotating table 63, and a measuring instrument 65 attached to the rotating table 63 for measuring the levelness of the horizontal surface 52b of the support metal fitting 52 relative to the support column 51.

[0045] According to the support metal welding device of the first aspect, the welding machine 64 and the measuring instrument 65 are mounted on the rotating table 63, so that the welding work for the joint between the support column 51 and the support metal 52 and the measurement work for measuring the levelness of the horizontal surface 52b of the support metal 52 relative to the support column 51 can be carried out efficiently. As a result, the workability of the welding work of the support metal 52 to the support column 51 can be improved.

[0046] The welding device for a support metal according to the second embodiment is the welding device for a support metal according to the first embodiment, and furthermore, the welding machine 64 and the measuring device 65 are arranged at positions offset in the circumferential direction. This prevents interference between the welding work by the welding machine 64 and the measurement work by the measuring device 65, improving workability.

[0047] The welding device for support metal according to the third aspect is the welding device for support metal according to the first or second aspect, further comprising: support metal 52 having a horizontal surface 52b on its outer periphery; and measuring device 65 having a laser displacement meter that measures the distance to horizontal surface 52b. This allows measuring device 65 to measure the level of horizontal surface 52b of support metal 52 with high accuracy.

[0048] The welding device for support metal according to the fourth aspect is the welding device for support metal according to any one of the first to third aspects, and further comprises a support base 82 supported by a support rod (support member) 83 above a rotating table 63, a welding machine 64 supported on the underside of the support base 82, and a measuring instrument 65 supported on the upper side of the support base 82. This prevents interference between the welding work by the welding machine 64 and the measurement work by the measuring instrument 65, improving workability.

[0049] A welding method for a support metal according to a fifth aspect includes the steps of performing a plurality of temporary welds at circumferentially spaced positions on the joint between the support column 51 and the support metal 52, setting the next temporary weld position based on the measurement results obtained by measuring the levelness of the horizontal surface 52b of the support metal 52 relative to the support column 51 after each temporary weld, performing main welding in a plurality of circumferential regions centered on the temporary weld position after the temporary welding is completed, and setting the next main weld position based on the measurement results obtained by measuring the levelness of the horizontal surface 52b of the support metal 52 relative to the support column 51 after each main welding. This improves the workability of welding the support metal 52 to the support column 51. [Explanation of symbols]

[0050] 10 Pressurized Water Reactor 11 Reactor vessel 12 Reactor vessel body 13 Reactor vessel lid 18 Core Tank 19 Upper core support plate 20 Upper core plate 21 Core support rod 25 reactor core 26 Fuel assembly 51 Support column 52 Support hardware 53 Clasp 54 Welded section 56 Lower thermocouple extraction pipe 57 Upper thermocouple extraction pipe 60 Welding equipment 61 Mounting stand 62 Holding device 63 Turntable 64 Welding Machine 65 Measuring Instruments 71 Notch 72 Drive unit 73 Retaining member 74 Upper table 75 Lower table 76 Connecting rod 77 Guide Rail 78 Guide member 79 Drive Unit 80 Drive gear 81 racks 82 Support stand 83 Support rod 84 bottom bracket 85 Upper bracket

Claims

1. A welding device for a support metal fitting is provided for welding a lower end of a cylindrical support metal fitting to an upper end of a support column having a cylindrical shape and a stopper plate attached to the inside of the upper end for supporting a thermocouple lead pipe, a platform disposed around the support column; a holding device disposed on the frame and capable of holding the support pole; a rotating table supported on the base so as to be rotatable about the axis of the support column; a welding machine attached to the turntable; a measuring instrument attached to the rotating table for measuring the horizontality of the horizontal surface of the support metal fitting relative to the support column; A welding device for support fittings.

2. The welding machine and the measuring instrument are arranged at positions offset in the circumferential direction. The welding device for a support metal fitting according to claim 1.

3. The support metal has a horizontal surface on its outer periphery, and the measuring instrument has a laser displacement meter that measures the distance to the horizontal surface.

3. A welding device for a support metal fitting according to claim 1 or 2.

4. a support table is supported above the rotating table by a support member, the welding machine is supported on a lower surface side of the support table, and the measuring instrument is supported on an upper surface side of the support table; The welding device for a support metal fitting according to claim 1.

5. A method for welding a support metal fitting, in which a lower end of a cylindrical support metal fitting is welded to an upper end of a cylindrical support column having a stopper plate attached to the inside of the upper end for supporting a thermocouple lead pipe, performing a plurality of temporary welding steps at positions spaced apart in the circumferential direction of the joint between the support column and the support metal; a step of setting a next temporary welding position based on a measurement result obtained by measuring the horizontality of the horizontal surface of the support metal fitting relative to the support column each time the temporary welding is performed; After the pre-welding is completed, main welding is performed on a plurality of circumferential regions centered on the pre-welding position; a step of setting a next main welding position based on a measurement result obtained by measuring the horizontality of the horizontal surface of the support metal with respect to the support column each time the main welding is performed; A method for welding a support metal fitting having the above structure.

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