JP2013103243A - Welding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding apparatus that can weld an interior of a pipe with a relatively small diameter.SOLUTION: The welding apparatus includes: an insertion part 1 inserted into the interior of the pipe; a non-insertion part 2 disposed outside the pipe to dispose the insertion part 1 inside the pipe; a welding torch 11 installed in the insertion part 1 to apply welding to an inner surface of the pipe while being disposed inside the pipe; a welding torch movement mechanism 12 installed in the insertion part 1 to move the welding torch 11 in an axial direction of the pipe to which a tip 11a of the welding torch 11 is oriented; a rotational movement mechanism 22 installed in the non-insertion part 2 to rotate a supporting rod 21 that is attached with the insertion part 1 at the tip thereof and inserted into the pipe, about an axis S1 of the supporting rod 21; an axial movement mechanism 23 installed in the non-insertion part 2 to move the supporting rod 21 along an extending direction of the axis S1 of the supporting rod 21; and a welding wire feeding mechanism 24 installed in the non-insertion part 2 to feed a welding wire to the welding torch 11.

Description

  The present invention relates to a welding apparatus that performs welding, for example, as a repair of a pipe provided in a nuclear vessel.

  Conventionally, for example, the reactor vessel nozzle work system described in Patent Document 1 performs work inside the reactor vessel nozzle. Among these operations, for example, the welded portion is cut and overlay welding is performed there. In this reactor vessel nozzle work system, the welding apparatus (welding unit) includes a welding torch for arc discharge, and a welding material supply means for supplying a wire as a welding material to the tip side of the welding torch, Illuminating means for illuminating the tip side of the welding torch, photographing means for photographing the tip side of the welding torch, a position sensor for detecting a relative position with respect to the nozzle, a support member for supporting these, and a guide attached to the support member Connected portion connected to the connection portion of the apparatus (see Patent Document 1: Paragraph 0059 and FIG. 12).

JP 2011-17670 A

  By the way, for example, in a two-loop reactor in which two steam generators are connected, in addition to an outlet nozzle and an inlet nozzle, a water injection pipe is connected to a water injection pipe for injecting cooling water into the reactor. Is provided. Even in the welded portion between the water injection nozzle and the water injection pipe, it is necessary to measure the inner diameter for maintenance.

  However, the above-described welding apparatus of Patent Document 1 is applied to the measurement of the inner diameter of the outlet nozzle and the inlet nozzle with an inner diameter of approximately 700 mm, and cannot be inserted into the water injection nozzle having an inner diameter of approximately 90 mm. . Therefore, a welding apparatus that can be inserted into a small-diameter pipe such as a water injection nozzle and can weld a cut portion on the inner surface of the pipe is desired.

  This invention solves the subject mentioned above, and aims at providing the welding apparatus which can weld the inside of a comparatively small diameter pipe | tube.

  In order to achieve the above-described object, a welding apparatus according to the present invention includes an insertion portion that is inserted into a tube, and a non-insertion portion that is disposed outside the tube and places the insertion portion inside the tube. A welding torch that is provided in the insertion portion and welds to the inner surface of the tube in a state of being disposed inside the tube; and a radial direction of the tube that is provided in the insertion portion and that a tip portion of the welding torch faces A welding torch moving mechanism for moving the welding torch, and a rotation that is provided at the non-insertion portion, and that rotates the support rod that is inserted into the pipe with the insertion portion attached to the distal end about the axis of the support rod. A moving mechanism, an axial movement mechanism provided in the non-insertion portion, and moving the support rod along the extending direction of the shaft of the support rod; and provided in the non-insertion portion, leading to the welding torch. Welding wire for supplying welding wire Characterized in that it comprises Ya supply mechanism and the.

  According to this welding apparatus, a welding torch and a welding torch moving mechanism are provided in the insertion portion arranged inside the pipe, and a rotational movement mechanism, an axial movement mechanism is provided in the non-insertion portion arranged outside the pipe, In addition, since the welding wire supply mechanism is provided, welding can be performed with a welding torch and a welding torch moving mechanism disposed therein even if the pipe has a relatively small diameter.

  In the welding apparatus of the present invention, the welding torch is attached to a front end side of a base member extending in an axial direction in which the pipe extends, and the welding torch moving mechanism is disposed on a rear end side of the base member. It is attached, The said welding torch is moved with the said base member, It is characterized by the above-mentioned.

  According to this welding apparatus, by providing a predetermined distance between the welding torch and the welding torch moving mechanism via the base member, the heat of the welding torch with respect to the welding torch moving mechanism is relatively inside the relatively small diameter pipe. The influence can be suppressed.

  In addition, the welding apparatus of the present invention is provided with the insertion portion, and a welding wire support portion that movably supports the welding wire so that the tip of the welding wire approaches or separates from the tip of the welding torch. The welding wire support portion is provided so as to be movable together with the welding torch by the welding torch moving mechanism.

  According to this welding apparatus, even a relatively small-diameter pipe is welded with a welding torch and a welding torch moving mechanism disposed therein, and the position of the welding wire with respect to the welding torch is determined by the welding wire support portion. Can be adjusted.

  In the welding apparatus of the present invention, the welding torch is attached to a front end side of a base member extending in an axial direction in which the pipe extends, and the welding wire support portion is attached to a rear end of the base member. And connected to a moving member of the welding torch moving mechanism.

  According to this welding apparatus, by providing a predetermined distance between the welding torch and the welding wire support through the base member, the heat of the welding torch with respect to the welding wire support in the relatively small-diameter pipe is obtained. The influence can be suppressed.

  Further, the welding apparatus of the present invention is provided with the temperature measuring means for measuring the ambient temperature welded by the welding torch, and the vicinity provided by the temperature measuring means. A temperature measurement unit imaging unit that images the temperature measurement unit, and a temperature monitoring unit cooling unit that is provided in the insertion unit and that cools the temperature measurement unit imaging unit, the temperature measurement unit, the temperature measurement unit imaging unit, and the temperature monitoring The part cooling means is provided so as to be movable together with the welding torch by the welding torch moving mechanism.

  According to this welding apparatus, even with a relatively small-diameter pipe, welding is performed with a welding torch and a welding torch moving mechanism arranged therein, and the ambient temperature to be welded is measured by the temperature measurement means and the temperature measurement. It can be managed by the partial imaging means. Furthermore, by cooling the temperature measurement unit imaging unit by the temperature monitoring unit cooling unit, it is possible to suppress the influence of the heat of the welding torch on the temperature measurement unit imaging unit inside the relatively small diameter pipe.

  Further, the welding apparatus of the present invention is provided in the insertion portion, and welded portion imaging means for imaging the vicinity of the distal end portion of the welding torch, and provided in the insertion portion, and illuminates the vicinity of the distal end portion of the welding torch. An illumination unit; and an imaging cooling unit that cools the welding unit imaging unit and the illumination unit, the imaging unit including the welding unit imaging unit, the illumination unit, and the imaging cooling unit. The moving mechanism is provided so as to be movable together with the welding torch.

  According to this welding apparatus, even with a relatively small-diameter pipe, welding is performed with a welding torch and a welding torch moving mechanism arranged therein, and the state of the welding torch is monitored by the welding portion imaging means. Can do. In addition, a filter is provided on the welding part imaging means to block the light during welding of the welding torch, but by providing an illumination means, the state of the welding torch other than during welding such as during welding teaching is monitored. can do. Further, by cooling the welding portion imaging means and the illumination means by the imaging cooling means, it becomes possible to suppress the influence of the heat of the welding torch on the welding portion imaging means and the illumination means within the relatively small diameter pipe.

  Moreover, the welding apparatus of the present invention is provided on the support rod, and includes an insertion portion imaging means for imaging the insertion portion side.

  According to this welding apparatus, when the insertion portion is inserted into the pipe, the state of the insertion portion can be monitored by the insertion portion imaging means. As a result, the insertion portion can be monitored so as not to come into contact with the inner surface of the pipe, and damage to the welding torch and the pipe can be prevented.

  Further, in the welding apparatus of the present invention, the welding wire supply mechanism includes a wire reel around which the welding wire is wound, a wire delivery unit that feeds the welding wire from the wire reel, and the welding wire that is wound on the wire reel. Wire reel winding means for biasing rotation in the direction.

  According to this welding apparatus, since the welding wire is always wound around the wire reel by the wire reel winding means, the welding wire wound around the wire reel is not loosened, and the welding wire can be appropriately sent in welding. . Moreover, it is necessary to reversely feed the welding wire after completion of welding, and this reverse feeding can be performed.

  ADVANTAGE OF THE INVENTION According to this invention, the welding apparatus which can weld the inside of a comparatively small diameter pipe | tube can be provided.

FIG. 1 is a schematic diagram illustrating an example of a nuclear facility. FIG. 2 is a cross-sectional view of the reactor vessel. FIG. 3 is a cross-sectional view of the water injection nozzle. FIG. 4 is an explanatory diagram of cutting and repairing of the water injection nozzle. FIG. 5 is an explanatory diagram of cutting and repairing of the water injection nozzle. FIG. 6 is a partially cutaway side view of the welding apparatus according to the embodiment of the present invention. FIG. 7 is a side view of the insertion portion of the welding apparatus according to the embodiment of the present invention. FIG. 8 is a plan view of the insertion portion of the welding apparatus according to the embodiment of the present invention. FIG. 9 is a perspective view of the insertion portion of the welding apparatus according to the embodiment of the present invention. FIG. 10 is a perspective view of the insertion portion of the welding apparatus according to the embodiment of the present invention. FIG. 11 is a side view of the welding wire radial movement mechanism of the welding apparatus according to the embodiment of the present invention. FIG. 12 is a side view of the welding wire axial movement mechanism of the welding apparatus according to the embodiment of the present invention. FIG. 13 is a side view of the non-insertion portion of the welding apparatus according to the embodiment of the present invention. FIG. 14 is a plan view of the non-insertion portion of the welding apparatus according to the embodiment of the present invention. FIG. 15 is an AA cross-sectional enlarged view in FIG. FIG. 16 is a side view showing the operation of the non-insertion portion of the welding apparatus according to the embodiment of the present invention. FIG. 17 is a block diagram of a control system of the welding apparatus according to the embodiment of the present invention. FIG. 18 is a side view showing the operation of the insertion portion of the welding apparatus according to the embodiment of the present invention. FIG. 19 is a side view showing the operation of the insertion portion of the welding apparatus according to the embodiment of the present invention. FIG. 20 is a side view showing the operation of the other insertion portion of the welding apparatus according to the embodiment of the present invention. FIG. 21 is a side view showing the operation of another insertion portion of the welding apparatus according to the embodiment of the present invention.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a schematic view showing an example of a nuclear facility, and FIG. 2 is a cross-sectional view of a nuclear reactor vessel. As shown in FIG. 1, the nuclear power facility 100 includes, for example, a pressurized water reactor (PWR: Pressurized Water Reactor). In this nuclear power facility 100, a reactor vessel 101, a pressurizer 102, a steam generator 103, and a pump 104 are sequentially connected by a primary cooling water pipe 105 to constitute a circulation path of primary cooling water. Further, a circulation path of secondary cooling water is configured between the steam generator 103 and the turbine (not shown).

  In this nuclear power facility 100, the primary cooling water is heated in the reactor vessel 101 to become high temperature and high pressure, and steam is generated through the primary cooling water pipe 105 while being pressurized by the pressurizer 102 to keep the pressure constant. Is supplied to the vessel 103. In the steam generator 103, heat exchange between the primary cooling water and the secondary cooling water is performed, whereby the secondary cooling water evaporates and becomes steam. The secondary cooling water converted into steam by heat exchange is supplied to the turbine. The turbine is driven by the secondary cooling water steam. Then, the power of the turbine is transmitted to a generator (not shown) to generate electricity. The steam used for driving the turbine is condensed into water and supplied to the steam generator 103. On the other hand, the primary cooling water after heat exchange is collected on the pump 104 side via the primary cooling water pipe 105.

  As shown in FIG. 1, the steam generator 103 is provided with an inlet-side water chamber 103a and an outlet-side water chamber 103b partitioned by a partition plate 103c in the lower part formed in a hemispherical shape. The inlet side water chamber 103a and the outlet side water chamber 103b are separated from the upper side of the steam generator 103 by a tube plate 103d provided on the ceiling portion. On the upper side of the steam generator 103, an inverted U-shaped heat transfer tube 103e is provided. The end portion of the heat transfer tube 103e is supported by the tube plate 103d so as to connect the inlet side water chamber 103a and the outlet side water chamber 103b. The inlet-side water chamber 103a is provided with an inlet nozzle 103f as a piping nozzle, and an inlet-side primary cooling water pipe 105 is connected to the inlet nozzle 103f. On the other hand, the outlet side water chamber 103b is provided with an outlet pedestal 103g as a piping nozzle, and the outlet side primary cooling water pipe 105 is connected to the outlet pedestal 103g.

  As shown in FIG. 1, the nuclear reactor vessel 101 includes a vessel main body 101a and a vessel lid 101b mounted on the upper portion thereof so that a fuel assembly (not shown) can be inserted and removed. The container lid 101b is provided so as to be openable and closable with respect to the container main body 101a. The container body 101a has a cylindrical shape with an upper opening and a lower hemispherical shape that is closed, and an upper part is provided with an inlet nozzle 101c and an outlet nozzle 101d for supplying and discharging light water as primary cooling water. Yes. A primary cooling water pipe 105 is connected to the outlet nozzle 101 d so as to communicate with the inlet nozzle 103 f of the steam generator 103. Moreover, the primary cooling water pipe 105 is connected to the inlet nozzle 101 c so as to communicate with the outlet nozzle 103 g of the steam generator 103. In addition, as shown in FIG. 2, the reactor vessel 101 is provided with a water injection nozzle 101e, which is a pipe for water injection, at the same height as the inlet nozzle 101c and the outlet nozzle 101d in the vessel main body 101a. Yes. A water injection pipe 101f which is a pipe is connected to the water injection pipe base 101e by welding.

  FIG. 3 is a cross-sectional view of the water injection nozzle, and FIGS. 4 and 5 are explanatory diagrams of cutting and repairing of the water injection nozzle. The water injection nozzle 101e is periodically inspected in order to ensure the safety and reliability of the nuclear facility 100 described above. As a result of this inspection, there is a possibility that surface defects such as cracks due to secular change may occur in the welded portion 101g, which is a connecting portion between the water injection nozzle 101e and the water injection piping 101f, as shown in FIG. When a defect is found, the weld 101g is cut and repaired. Specifically, as shown in FIG. 4, the inner surface of the welded portion 101g is cut together with part of the inner surfaces of the water injection nozzle 101e and the water injection piping 101f, and a weld overlay of a predetermined alloy type is applied to the cut cutting portion A. B is performed, and the portion where the welding overlay B is performed and the periphery thereof are finished. Further, when there is a risk of occurrence of a defect or the defect is deep from the inner surface of the welded portion 101g, as shown in FIG. 5, the inner surface of the welded portion 101g is part of the inner surfaces of the water injection nozzle 101e and the water injection pipe 101f. Then, the welded part B of a predetermined alloy type is applied to the cut part A that has been cut, and the welded part B and its periphery are finished. The shallow cutting and overlaying shown in FIG. 4 are performed along the entire circumference of the inner surface of the water injection nozzle 101e. Further, the deep cutting and overlaying shown in FIG. 5 are performed along the local portion or the entire circumference of the inner surface of the water injection nozzle 101e. The above cutting and welding may be performed regardless of the presence or absence of defects.

  The welding apparatus according to the present embodiment is applied in order to perform overlay welding after cutting at the above-described cutting / repairing locations. FIG. 6 is a side view of the welding device according to the present embodiment, partly cut, FIG. 7 is a side view of the insertion portion of the welding device according to the present embodiment, and FIG. It is a top view of the insertion part of the welding apparatus which concerns on a form, FIG. 9 and FIG. 10 is a perspective view of the insertion part of the welding apparatus which concerns on this Embodiment, FIG. 11 is the welding apparatus which concerns on this Embodiment FIG. 12 is a side view of the welding wire radial movement mechanism of FIG. 12, FIG. 12 is a side view of the welding wire axial movement mechanism of the welding apparatus according to the present embodiment, and FIG. 13 is a welding apparatus according to the present embodiment. 14 is a side view of the non-insertion portion, FIG. 14 is a plan view of the non-insertion portion of the welding apparatus according to the present embodiment, and FIG. 15 is an AA cross-sectional enlarged view in FIG. These are side views which show operation | movement of the non-insertion part of the welding apparatus which concerns on this Embodiment.

  The welding device is inserted into the inside of the reactor vessel 101 described above and into the pipe from the water injection pipe stand 101e to the water injection pipe 101f. As shown in FIG. 6, the front side is inserted into the pipe. An insertion portion 1 provided in the tube, and a non-insertion portion 2 provided on the rear side disposed outside the tube and disposed inside the tube, and not inserted into the tube itself. have.

  As shown in FIG. 6, the entire insertion portion 1 is formed with a diameter smaller than the inner diameter of the tube so as to be inserted into the tube. The insertion portion 1 includes a base member 1a formed in a longitudinal shape in the extending direction of the axis S1 along the axial direction in which the tube extends in a state of being disposed in the tube. And the insertion part 1 has the welding torch 11, the welding torch moving mechanism 12, the welding wire support part 13, the temperature monitoring part 14, and the welding monitoring part 15 based on the base member 1a.

  As shown in FIGS. 6 and 7, the welding torch 11 is fixed to the front end where the base member 1a is inserted into the pipe. The welding torch 11 is provided with the tip 11a, which is an electrode, facing in a direction perpendicular to the axis S1 (in a state of being arranged on the pipe, a radial direction perpendicular to the axial direction of the pipe).

  Further, in the vicinity of the welding torch 11, a welding cooling means 111 for cooling the periphery welded by the welding torch is provided. The welding cooling means 111 includes an air nozzle 111a attached to the base member 1a and disposed in the vicinity of the welding torch 11, and an air supply pipe 111b for supplying a cooling gas (for example, argon gas) to the air nozzle 111a.

  As shown in FIG. 6, the welding torch moving mechanism 12 is provided at the rear end side of the base member 1 a and at the front end of the support rod 21 in the non-insertion portion 2 described later, and the front end portion 11 a of the welding torch 11 faces. The welding torch 11 is moved together with the base member 1a in the direction (the radial direction of the pipe orthogonal to the axis S1). As shown in FIG. 7, the welding torch moving mechanism 12 includes a welding torch drive motor 12a, a screw rod 12b, a nut portion 12c, a guide rail 12d, a slider 12e as a moving portion, and a movement detection sensor 12f, which are casings. 12g. The casing 12g is fixed to the front end of the support rod 21, as shown in FIG.

  The screw rod 12b extends in the direction in which the distal end portion 11a of the welding torch 11 faces (the radial direction of the pipe perpendicular to the axis S1) and is rotatably attached to the casing 12g. The screw rod 12b is connected to the output shaft of the welding torch drive motor 12a via a gear. The nut portion 12c is screwed to the screw rod 12b. The guide rail 12d extends in the direction in which the distal end portion 11a of the welding torch 11 faces (the radial direction of the pipe perpendicular to the axis S1) and is fixed to the casing 12g. A pair of guide rails 12d are provided in parallel. The slider 12e is provided so as to be movable along the extending direction of the guide rail 12d with respect to the pair of guide rails 12d. The slider 12e is fixed integrally with the nut portion 12c. The slider 12e is connected to the base member 1a side to which the welding torch 11 is fixed. The movement detection sensor 12f is a resistance sensor, and a moving element is provided in a direction in which the distal end portion 11a of the welding torch 11 faces (the radial direction of the pipe perpendicular to the axis S1). Accordingly, the position of the moving element is detected by changing the resistance value. The movement detecting sensor 12f has a moving element attached to the slider 12e.

  In such a welding torch moving mechanism 12, the screw rod 12b is rotated by the driving of the welding torch drive motor 12a. Then, the nut portion 12c screwed to the screw rod 12b moves together with the slider 12e guided by the guide rail 12d in the direction in which the tip portion 11a of the welding torch 11 faces (the radial direction of the pipe perpendicular to the axis S1). To do. For this reason, the welding torch 11 moves together with the base member 1a as the slider 12e moves. The position to which the welding torch 11 has moved is detected by a movement detection sensor 12f. As described above, since the welding cooling means 111 is attached to the base member 1 a in the vicinity of the welding torch 11, the welding cooling means 111 is also moved together with the welding torch 11 by the welding torch moving mechanism 12.

  The welding torch moving mechanism 12 includes a rotating shaft 12h that is supported so as to be rotatable with respect to the casing 12g while extending in a direction in which the distal end portion 11a of the welding torch 11 faces (the radial direction of the pipe perpendicular to the axis S1). Have. The rotary shaft 12h is connected to the output shaft of the welding torch drive motor 12a via a gear, and is supported by the casing 12g so as to be rotatable about the central axis along the axis S1 and the gear. It is rolled through. The rotor 12i is configured such that a tool (not shown) is fitted from the outside on the rear side of the casing 12g. For this reason, when the welding torch drive motor 12a breaks down, the screw rod 12b can be rotated via the rotary shaft 12h and the output shaft of the welding torch drive motor 12a if the tool is fitted to the rotor 12i and turned. As a result, the welding torch 11 can be moved manually.

  The welding wire support portion 13 supports a welding wire whose tip is disposed in the vicinity of the tip portion 11 a of the welding torch 11. Furthermore, the welding wire support part 13 supports a welding wire so that a movement is possible so that the front-end | tip of a welding wire may approach or leave | separate with respect to the front-end | tip part 11a of the welding torch 11. FIG. Here, as shown in FIGS. 7 to 10, the welding wire is inserted through the conduit liner 3 and guided from the non-insertion portion 2 side to the distal end portion 11 a of the welding torch 11 of the insertion portion 1. The welding wire support portion 13 supports the conduit liner 3. As shown in FIGS. 8 to 10, the welding wire support portion 13 is attached to the welding wire axial movement mechanism 131 provided between the base member 1 a and the slider 12 e of the welding torch movement mechanism 12 and the conduit liner 3. And a welding wire radial movement mechanism 132 attached to the welding wire axial movement mechanism 131.

  As shown in FIGS. 8 to 10, the welding wire axial movement mechanism 131 has a casing 131 a fixed to the rear end of the base member 1 a and a slider 12 e of the welding torch movement mechanism 12 as shown in FIG. 7. Are connected to each other via a connecting member 131b. As shown in FIG. 11, the welding wire axial direction moving mechanism 131 accommodates a welding wire axial direction drive motor 131c, a screw rod 131d, a nut portion 131e, a guide rail 131f, and a slider 131g in a casing 131a.

  The threaded rod 131d extends in the axial direction of the tube along the axis S1, and is rotatably attached to the casing 131a. The threaded rod 131d is connected to the output shaft of the welding wire axial drive motor 131c via a gear. The nut portion 131e is screwed to the screw rod 131d. The guide rail 131f extends in the axial direction of the pipe along the axis S1, and is fixed to the casing 131a. The slider 131g is provided so as to be movable along the extending direction of the guide rail 131f with respect to the guide rail 131f. The slider 131g is fixed integrally with the nut portion 131e. The slider 131g is connected to a casing 132a of a welding wire radial direction moving mechanism 132, which will be described later.

  In such a welding wire axial direction moving mechanism 131, the screw rod 131d is rotated by the driving of the welding wire axial direction driving motor 131c. Then, the nut portion 131e that is screwed to the screw rod 131d moves in the axial direction of the tube along the axis S1 together with the slider 131g guided by the guide rail 131f. For this reason, the conduit liner 3 moves together with the welding wire radial movement mechanism 132 in accordance with the movement of the slider 131g. As a result, the welding wire inserted in the conduit liner 3 moves in the axial direction of the pipe along the axis S1.

  As described above, the welding wire radial direction moving mechanism 132 has its casing 132 a connected to the slider 131 g of the welding wire axial direction moving mechanism 131. As shown in FIG. 12, the welding wire radial direction moving mechanism 132 contains a welding wire radial direction drive motor 132c, a screw rod 132d, a nut portion 132e, a guide rail 132f, and a slider 132g in a casing 132a.

  The threaded rod 132d extends in the direction in which the distal end portion 11a of the welding torch 11 faces (the radial direction of the pipe perpendicular to the axis S1) and is rotatably attached to the casing 132a. The threaded rod 132d is connected to the output shaft of the welding wire radial drive motor 132c via a gear. The nut portion 132e is screwed to the screw rod 132d. The guide rail 132f extends in the direction in which the distal end portion 11a of the welding torch 11 faces (the radial direction of the pipe perpendicular to the axis S1) and is fixed to the casing 132a. The slider 132g is provided so as to be movable along the extending direction of the guide rail 132f with respect to the guide rail 132f. The slider 132g is fixed integrally with the nut portion 132e. Moreover, the conduit liner 3 which inserts a welding wire is attached to the slider 132g.

  In such a welding wire radial direction moving mechanism 132, the screw rod 132d is rotated by the driving of the welding wire radial direction drive motor 132c. Then, the nut portion 132e threadedly engaged with the screw rod 132d moves together with the slider 132g guided by the guide rail 132f in the direction in which the tip portion 11a of the welding torch 11 faces (the radial direction of the pipe perpendicular to the axis S1). To do. For this reason, the conduit liner 3 moves with the movement of the slider 132g. As a result, the welding wire inserted into the conduit liner 3 moves in the direction in which the distal end portion 11a of the welding torch 11 faces (the radial direction of the pipe perpendicular to the axis S1).

  In the welding wire support portion 13, the welding wire axial movement mechanism 131 is provided between the base member 1 a and the slider 12 e of the welding torch movement mechanism 12, and the welding wire axial movement mechanism 131 is the conduit liner 3. Is attached to the welding wire axial direction moving mechanism 131 and is moved together with the welding torch 11 by the welding torch moving mechanism 12.

  The temperature monitoring part 14 monitors the temperature of the nozzle surface before welding with the welding torch 11 in welding. Since the temper bead welding is applied to the welding performed in the present embodiment, it is necessary to perform temperature management. As shown in FIGS. 7 to 10, the temperature monitoring unit 14 includes a temperature measurement unit 141, a temperature measurement unit imaging unit 142, and a temperature monitoring unit cooling unit 143 (see FIG. 10). As the temperature measuring means 141, for example, a radiation thermometer is applied, and the temperature is measured in a non-contact manner. This temperature measuring means 141 is provided on the base member 1a and is arranged to measure the temperature in a direction opposite to the direction in which the tip 11a of the welding torch 11 faces in order to reduce the influence of the temperature during welding. ing. The temperature measurement unit imaging means 142 is provided on the base member 1 a and images the vicinity where the temperature is measured by the temperature measurement means 141. The temperature measuring unit imaging unit 142 puts a marking on the imaging screen in order to clarify the part where the temperature is measured by the temperature measuring unit 141. The temperature monitoring unit cooling unit 143 is configured to supply cooling water used for cooling the welding torch 11 to a water cooling jacket that covers the periphery of the temperature measurement unit imaging unit 142. Since the temperature monitoring unit 14 is provided on the base member 1 a, the temperature monitoring unit 14 is moved together with the welding torch 11 by the welding torch moving mechanism 12.

  The welding monitoring unit 15 monitors the state of the surroundings that are welded by the welding torch 11 during welding. As shown in FIGS. 7 to 10, the welding monitoring unit 151, the illumination unit 152, and the imaging cooling unit 153. have. The welded part imaging means 151 is provided on the base member 1 a and images the vicinity of the distal end part 11 a of the welding torch 11. This welded part imaging means 151 is provided with a filter for capturing images while blocking light during welding. The illumination means 152 is attached to a support member 154 that extends and is fixed to the front side of the welding torch 11 with respect to the base portion to which the welding torch 11 is attached to the base member 1 a, and is disposed at the foremost side of the insertion portion 1. Has been. And the illumination means 152 illuminates the vicinity of the front-end | tip part 11a of the welding torch 11 from the foremost side of the insertion part 1. FIG. The imaging cooling means 153 cools the welding part imaging means 151 and the illumination means 152 in order to suppress the influence of the temperature at the time of welding. The imaging cooling unit 153 is configured such that cooling water used for cooling the welding torch 11 is supplied to a water cooling jacket that covers the periphery of the welding unit imaging unit 151 and the illumination unit 152. The welding monitoring unit 15 is welded by the welding torch moving mechanism 12 because the welding unit imaging unit 151 is provided on the base member 1 a and the illumination unit 152 is provided on the base of the welding torch 11 via the support member 154. Move with torch 11.

  The non-insertion portion 2 is configured based on a support rod 21 in which the insertion portion 1 described above is disposed at the front end, and includes a rotational movement mechanism 22, an axial movement mechanism 23, a welding wire supply mechanism 24, and an insertion portion. And imaging means 27.

  The support rod 21 arranges the insertion portion 1 fixed to the front end inside the tube. As shown in FIGS. 13 to 15, the support rod 21 has an outer diameter that can be inserted into the tube, is formed in a hollow cylindrical shape, and is arranged around the axis S <b> 1. . The support rod 21 has a casing 12g of a welding torch moving mechanism 12 provided at the insertion portion 1 fixed to the front end thereof. Although not clearly shown in the figure, the support rod 21 has a hollow power supply cable for the welding torch 11, a power cable for the welding torch drive motor 12a, a signal cable for the movement detection sensor 12f, and welding. Power cable of wire axial direction drive motor 131c, power cable of welding wire radial direction drive motor 132c, signal cable of temperature measuring means 141, power cable of temperature measuring section imaging means 142, power cable of welding section imaging means 151, illumination means By inserting the power cable 152, the water supply tube of the imaging cooling means 153 (cooling structure of the welding torch), and the conduit liner 3, each cable is configured to be drawn out of the pipe through the support rod 21. ing. Further, the support rod 21 is provided with a cable reel 26 for winding the cables on the rear end side. In addition, the support rod 21 is provided with a tool insertion tube 211 inside the hollow. The tool insertion tube 211 extends in a longitudinal shape from the front end to the rear end of the support rod 21, and the front end is arranged to face the rotor 12 i in the welding torch moving mechanism 12. For this reason, when the welding torch 11 is moved manually, the tool can be easily fitted to the rotor 12i via the tool insertion tube 211.

  The rotational movement mechanism 22 rotationally moves the support rod 21 about the axis S1, and as shown in FIGS. 13 to 15, the rotational movement support part 221, the rotational drive motor 222, the drive pulley 223, the driven pulley 224, and the drive A belt 225 is provided.

  The rotational movement support portion 221 supports the support rod 21 so as to be rotatable about the axis S1, and is formed in a cylindrical shape and arranged around the support rod 21 as shown in FIG. A bearing 221a is provided between the rod 21 and the rod 21. The rotational movement support portion 221 is supported by a frame 25 that is a base portion of the non-insertion portion 2. The frame 25 is formed in a substantially cylindrical shape, and is provided with a flange 25a that protrudes to the outer periphery at the rear end. As shown in FIG. 13, the frame 25 has a bottomed cylindrical platform that constitutes an aerial working environment inside the reactor vessel 101 outside the pipe (corresponding to the platform of JP 2011-17670 A). 106 is fixed. Specifically, the platform 106 is provided with a circular window hole 106a leading to a pipe on a cylindrical side wall, and an attachment base 107 is fixed to the window hole 106a. The mounting base portion 107 is formed in a cylindrical shape, and is provided with a flange 107a that protrudes to the outer periphery of an end portion disposed in the platform 106 in a state of being inserted into the window hole 106a. The attachment base 107 is fixed to the window hole 106a with the cylindrical center aligned with the axis of the tube. The frame 25 is inserted through the attachment base 107 and fixed to the flange 107a of the attachment base 107, so that the axis S1 of the support rod 21 is attached in accordance with the axis of the tube.

  As shown in FIG. 13, the rotation drive motor 222 is fixed to the rotational movement support portion 221 with the output shaft 222a parallel to the axis S1.

  The drive pulley 223 is provided on the output shaft 222a of the rotary drive motor 222 as shown in FIGS.

  The driven pulley 224 is provided on the outer periphery of the support rod 21 as shown in FIGS. 13 and 15.

  As shown in FIGS. 13 and 15, the drive belt 225 is an endless belt that is wound around the drive pulley 223 and the driven pulley 224.

  When the rotational drive motor 222 is driven, the rotational movement mechanism 22 transmits the rotation of the output shaft 222a from the drive pulley 223 to the driven pulley 224 via the drive belt 225, whereby the support rod 21 is welded to be described later. The wire supply mechanism 24 and an insertion portion imaging means 27 described later rotate around the axis S1. As a result, the insertion portion 1 attached to the front end of the support rod 21 rotates around the axis S1.

  The axial movement mechanism 23 moves the support rod 21 along the extending direction of the axis S1, and as shown in FIGS. 13 to 15, the axial movement support portion 231, the axial drive motor 232, and the screw rod 233. And a nut portion 234.

  As shown in FIGS. 14 to 16, the axial movement support portion 231 is provided on the frame 25, and has a pair of rails 231 a arranged in parallel with the axis S <b> 1 so as to sandwich the support rod 21. As shown in FIG. 15, each rail 231a is provided with a slider 231b that moves in the direction along the axis S1 along the rail 231a. The slider 231b has a rotational movement support portion 221 attached thereto. That is, the axial movement support portion 231 is provided between the frame 25 and the rotation movement support portion 221, supports the rotation movement support portion 221 on the frame 25, and supports the rotation movement support portion 221 with respect to the frame 25. It is supported so as to be movable in the direction along the axis S1.

  As shown in FIGS. 13 to 16, the axial drive motor 232 is fixed to the frame 25 with the output shaft 232a orthogonal to the axis S1.

  As shown in FIGS. 13 to 16, the screw rod 233 is a rod-like body extending in parallel with the axis S <b> 1, and a ball screw groove is provided around the rod-like body. The screw rod 233 is supported so as to be rotatable with respect to the frame 25. The screw rod 233 has a bevel gear provided at the rear end thereof meshed with a bevel gear provided on the output shaft 232 a of the axial drive motor 232.

  The nut portion 234 is screwed into the ball screw groove of the screw rod 233 as shown in FIGS. The nut portion 234 is fixed to the rotational movement support portion 221.

  In the axial movement mechanism 23, when the axial drive motor 232 is driven, the rotation of the output shaft 232a is transmitted to the screw rod 233, whereby the screw rod 233 rotates. Then, as shown in FIG. 16, the nut portion 234 that is screwed into the screw rod 233 moves in a direction along the axis S <b> 1 that is the extending direction of the screw rod 233. For this reason, the rotational movement support part 221 to which the nut part 234 is fixed moves in the direction along the axis S1 along the rail 231a, and the support rod 21 supported by the rotational movement support part 221 becomes the rotational movement mechanism 22. It moves in the direction along the axis S1 together with the welding wire supply mechanism 24 described later and the insertion portion imaging means 27 described later. As a result, the insertion portion 1 attached to the front end of the support rod 21 moves in the direction along the axis S1.

  The welding wire supply mechanism 24 reaches the welding torch 11 and supplies a welding wire, and is attached to the rear end of the support rod 21 as shown in FIGS. 13, 14 and 16, and is equipped with a wire reel 241 and a wire reel winding. A take-out means 242 and a wire delivery part 243 are provided.

  The wire reel 241 is used to wind a welding wire, and is provided to be rotatable around a rotation shaft 241a orthogonal to the axis S1, as shown in FIGS.

  The wire reel winding means 242 is made of a spring material wound around the rotating shaft 241a of the wire reel 241 as shown in FIGS. The wire reel winding means 242 winds the welding wire by winding the spring material when the welding wire is pulled out from the wire reel 241 by the wire delivery unit 243 described later and the wire reel 241 rotates in the direction of the arrow α. The rotation of the wire reel 241 in the direction of the arrow β, which is the take direction, is urged.

  The wire delivery unit 243 delivers a welding wire from the wire reel 241. As shown in FIGS. 13 and 16, the delivery drive motor 243a, a drive roller 243b that is rotationally driven by the delivery drive motor 243a, and a drive roller A driven roller 243c that comes into contact with 243b and a pressing portion 243d that presses the driven roller 243c against the driving roller 243b are provided. That is, the wire delivery unit 243 feeds the welding wire between the rollers 243b and 243c by driving the delivery drive motor 243a with the welding wire sandwiched between the drive roller 243b and the driven roller 243c.

  The insertion portion imaging means 27 images the insertion portion 1 side, and is fixed to the front end portion of the support rod 21 as shown in FIGS. 13, 14, and 16. The insertion portion imaging means 27 is provided in a pair in the radial direction of the tube orthogonal to the axis S1 and attached to the support rod 21 in a range of an outer shape smaller than the inner diameter of the tube. .

  FIG. 17 is a block diagram of a control system of the welding apparatus according to the present embodiment. The welding apparatus described above includes a welding torch 11, a welding torch drive motor 12a of the welding torch moving mechanism 12, a movement detection sensor 12f of the welding torch moving mechanism 12, a welding wire axial drive motor 131c of the welding wire axial movement mechanism 131, and welding. Rotation of welding wire radial direction drive motor 132c of wire radial direction moving mechanism 132, welded part imaging means 151, illumination means 152, temperature measuring means 141, temperature measuring part imaging means 142, insertion part imaging means 27, and rotation moving mechanism 22 A drive motor 222, an axial drive motor 232 of the axial movement mechanism 23, and a delivery drive motor 243 a of the welding wire supply mechanism 24 are connected to the control unit 4. The control unit 4 also includes an air pump 51 for supplying a cooling gas to the air nozzle 111 a of the welding cooling unit 111, a cooling for supplying cooling water to the temperature monitoring unit cooling unit 143, the imaging cooling unit 153, and the welding torch 11. A water pump 52 is connected.

  The control unit 4 is configured by a microcomputer or the like, and a storage unit 41 and a calculation unit 42 are connected to the control unit 4. The storage unit 41 includes a RAM, a ROM, and the like, and stores programs and data. The data stored in the storage unit 41 mainly includes fluctuation data of arc voltage when the tip 11a of the welding torch 11 approaches or separates from the inner surface of the pipe, and the welding torch 11 detected by the movement detection sensor 12f. Data of the movement position, data of the ambient temperature to be welded measured by the temperature measuring means 141, data of movement speeds associated with driving of the motors 131c, 132c, 222, 232, and of the sending drive motor 243a There is data on the feed rate of the welding wire accompanying driving. Moreover, the calculating part 42 mainly calculates the moving amount (moving speed) of the welding torch 11 by the welding torch moving mechanism 12 for keeping the arc length of the welding torch 11 constant based on the fluctuation of the arc voltage.

  Specifically, the operation of the welding apparatus by the control unit 4 will be described. 18 and 19 are side views showing the operation of the insertion portion of the welding apparatus according to the present embodiment.

  The operation of this welding apparatus is performed by inspecting a target pipe (for example, a welded part 101g of the water injection pipe base 101e and the water injection pipe 101f), and when the pipe is likely to be defective or a defect occurs, This is for overlay welding the cut portion of the cut. In this case, as shown in FIG. 6, a welding apparatus is installed in the target pipe. In this case, when the insertion portion 1 is inserted into the pipe, the distal end portion 11a of the welding torch 11 is moved by the welding torch moving mechanism 12 so that the welding torch 11 does not contact the inner surface of the pipe as shown in FIG. Keep away from the inner surface. Further, when the insertion portion 1 is inserted into the tube, the insertion portion imaging means 27 photographs the insertion portion 1 and confirms the positional relationship between the insertion portion 1 and the inner surface of the tube. When photographing the insertion portion 1 by the insertion portion imaging means 27, the illumination means 152 is preferably turned on. 18 and 19 show a case where the inner surface of the tube is cut relatively shallowly (for example, about 3.5 mm) over the entire circumference in the circumferential direction.

  First, temperature measurement is performed before welding. In this temperature measurement, the axial movement mechanism 23 appropriately adjusts so that the temperature measurement unit 141 measures the temperature in a non-contact manner (the surface of the cutting part of the tube) matches the marking of the temperature measurement unit imaging unit 142. The insertion portion 1 is moved in the axial direction of the tube along the axis S1, the insertion portion 1 is rotated in the circumferential direction of the tube around the axis S1 by the rotational movement mechanism 22, and the base member 1a is moved by the welding torch moving mechanism 12. Let

  Next, welding teaching is performed. In this welding teaching, as shown in FIG. 19, a short circuit is detected by moving the base member 1a by the welding torch moving mechanism 12 and bringing the tip 11a of the welding torch 11 into contact with the inner surface of the pipe in the cutting portion. And the insertion part 1 is moved to the axial direction of the pipe | tube along axis | shaft S1 by the axial direction moving mechanism 23. FIG. Then, this teaching is performed every predetermined angle (for example, 30 degrees) by rotating the insertion portion 1 around the axis S1 in the circumferential direction of the tube by the rotational movement mechanism 22. The teaching data taught in this way is stored in the storage unit 41.

  Next, welding is performed. In this welding, the insertion portion 1 is moved in the axial direction of the tube along the axis S1 by the axial movement mechanism 23 according to the teaching data described above, and the insertion portion 1 is moved around the axis S1 by the rotational movement mechanism 22 in the circumferential direction of the tube. , The base member 1 a is moved by the welding torch moving mechanism 12, and the welding wire is supplied by the welding wire supply mechanism 24. Moreover, the position of a welding wire is adjusted with the welding wire axial direction moving mechanism 131 and the welding wire radial direction moving mechanism 132 as needed. Then, welding is performed in the axial direction of the pipe along the axis S1, and this is continued in the circumferential direction of the pipe around the axis S1.

  Moreover, the temperature of the crater part of a welding start position is measured in the case of welding. In this measurement, the insertion portion 1 is appropriately moved along the axis S1 by the axial movement mechanism 23 so that the crater portion that measures the temperature in a non-contact manner by the temperature measurement unit 141 matches the marking of the temperature measurement unit imaging unit 142. The tube 1 is moved in the axial direction of the tube, the insertion portion 1 is rotated around the axis S 1 in the circumferential direction of the tube by the rotational movement mechanism 22, and the base member 1 a is moved by the welding torch moving mechanism 12. Simultaneously with this temperature measurement, the air pump 51 is driven to inject cooling gas from the air nozzle 111a of the welding cooling means 111, thereby lowering the temperature inside the pipe.

  20 and 21 are side views showing the operation of another insertion portion of the welding apparatus according to the present embodiment. Here, when there is a possibility that a defect may occur or the defect is in a relatively deep place from the inner surface of the welded part 101g, the pipe is locally cut deeply (for example, about 24 mm at the maximum) as shown in FIGS. In contrast to such local welding of the cutting portion, the welding apparatus of the present embodiment needs to move the welding torch 11 in the radial direction of the pipe intersecting the axis S1, so that the welding monitoring portion 15 is thereby obtained. The welding monitoring part 15 is provided separately from the inner surface of the pipe so that no contact with the inner surface of the pipe occurs. Specifically, the attachment position of the welded part imaging means 151 to the base member 1a is arranged on the side of the base member 1a, and a part of the illumination means 152 is cut away. In addition, about the operation | movement by the welding apparatus shown in FIG. 20 and FIG. 21, it is the same as that of the above-mentioned operation | movement.

  Then, after welding, the delivery drive motor 243a of the welding wire supply mechanism 24 is driven in reverse to the delivery time so that the welding wire is separated from the welding torch 11, and the welding wire is fed back. At this time, since the wire reel winding means 242 is provided on the wire reel 241 of the welding wire supply mechanism 24, the welding wire is wound around the wire reel 241. For this reason, even if the welding wire is reversely fed, the welding wire wound around the wire reel 241 is not loosened, and the welding wire can be appropriately fed in the next welding.

  As described above, the welding apparatus according to the present embodiment includes an insertion portion 1 that is inserted into the tube, a non-insertion portion 2 that is disposed outside the tube and places the insertion portion 1 inside the tube, and an insertion portion. 1 and a welding torch 11 that welds the inner surface of the pipe while being arranged inside the pipe, and a welding torch 11 that is provided in the insertion section 1 and that extends in the radial direction of the pipe to which the distal end portion 11a of the welding torch 11 faces. A welding torch moving mechanism 12 that moves the support rod 21, and a rotation that is provided in the non-insertion portion 2 and that rotates the support rod 21 that is inserted into the tube with the insertion portion 1 attached to the distal end about the support rod 21 about the axis S1. The moving mechanism 22 and the non-insertion portion 2 are provided on the non-insertion portion 2 and provided on the non-insertion portion 2 and the axial movement mechanism 23 that moves the support rod 21 along the extending direction of the axis S1 of the support rod 21. Welding to reach the torch 11 and supply a welding wire It provided with ear feed mechanism 24.

  According to this welding apparatus, the welding torch 11 and the welding torch moving mechanism 12 are provided in the insertion portion 1 arranged inside the pipe, and the rotational movement mechanism 22 is arranged in the non-insertion portion 2 arranged outside the pipe. Since the axial movement mechanism 23 and the welding wire supply mechanism 24 are provided, welding is performed with the welding torch 11 and the welding torch moving mechanism 12 disposed therein even if the pipe has a relatively small diameter. Is possible.

  The welding torch 11 is attached to the front end side of the base member 1a extending in the axial direction in which the pipe extends, and the welding torch moving mechanism 12 is attached to the rear end side of the base member 1a. At the same time, the welding torch 11 is moved.

  According to this welding apparatus, a predetermined distance is provided between the welding torch 11 and the welding torch moving mechanism 12 via the base member 1a, so that welding to the welding torch moving mechanism 12 is performed inside a relatively small diameter pipe. It becomes possible to suppress the influence of the heat of the torch 11.

  In addition, the welding apparatus according to the present embodiment is provided in the insertion portion 1 and supports a welding wire that movably supports the welding wire so that the tip of the welding wire approaches or separates from the tip portion 11a of the welding torch 11. The welding wire support portion 13 is provided so as to be movable together with the welding torch 11 by the welding torch moving mechanism 12.

  According to this welding apparatus, even if the pipe has a relatively small diameter, welding is performed with the welding torch 11 and the welding torch moving mechanism 12 disposed therein, and the position of the welding wire with respect to the welding torch 11 is set to the welding wire. It becomes possible to adjust by the support part 13.

  In the welding apparatus of the present embodiment, the welding torch 11 is attached to the front end side of the base member 1a extending in the axial direction in which the pipe extends, and the welding wire support portion 13 is the rear end of the base member 1a. And is connected to a moving member (slider 12e) of the welding torch moving mechanism 12.

  According to this welding apparatus, by welding a predetermined distance between the welding torch 11 and the welding wire support portion 13 via the base member 1a, welding to the welding wire support portion 13 is performed inside a relatively small diameter pipe. It becomes possible to suppress the influence of the heat of the torch 11.

  In addition, the welding apparatus according to the present embodiment is provided in the insertion portion 1 and measures the ambient temperature welded by the welding torch 11, and is provided in the insertion portion 1 and measured by the temperature measurement means 141. A temperature measurement unit imaging unit 142 that images the vicinity of the temperature measurement unit, and a temperature monitoring unit cooling unit 143 that is provided in the insertion unit 1 and that cools the temperature measurement unit imaging unit 142. The temperature measurement unit 141 and the temperature measurement unit imaging Means 142 and temperature monitoring unit cooling means 143 are provided so as to be movable together with welding torch 11 by welding torch moving mechanism 12.

  According to this welding apparatus, even if the pipe has a relatively small diameter, welding is performed with the welding torch 11 and the welding torch moving mechanism 12 disposed therein, and the ambient temperature to be welded is measured by the temperature measuring means 141. And the temperature measurement unit imaging means 142 can be managed. Further, by cooling the temperature measurement unit imaging unit 142 by the temperature monitoring unit cooling unit 143, it is possible to suppress the influence of the heat of the welding torch 11 on the temperature measurement unit imaging unit 142 inside the relatively small diameter pipe. Become.

  In addition, the welding apparatus according to the present embodiment is provided in the insertion portion 1 and includes a welding portion imaging unit 151 that images the vicinity of the distal end portion 11 a of the welding torch 11, and a distal end portion of the welding torch 11 that is provided in the insertion portion 1. An illumination unit 152 that illuminates the vicinity of 11a, and an imaging cooling unit 153 that is provided in the insertion unit 1 and cools the welding unit imaging unit 151 and the illumination unit 152. The welding unit imaging unit 151, the illumination unit 152, and imaging cooling A means 153 is provided so as to be movable together with the welding torch 11 by the welding torch moving mechanism 12.

  According to this welding apparatus, even if the pipe has a relatively small diameter, welding is performed with the welding torch 11 and the welding torch moving mechanism 12 disposed therein, and the appearance of the welding torch 11 is also observed in the welded part imaging unit 151. Can be monitored. In addition, a filter is provided in the welded part imaging means 151 in order to block the light at the time of welding of the welding torch 11, but by providing the illumination means 152, the welding torch 11 other than at the time of welding such as during welding teaching is provided. Can be monitored. Further, by cooling the welded part imaging unit 151 and the illumination unit 152 by the imaging cooling unit 153, the influence of the heat of the welding torch 11 on the welded part imaging unit 151 and the illumination unit 152 is suppressed inside a relatively small diameter pipe. It becomes possible.

  In addition, the welding apparatus of the present embodiment is provided on the support rod 21 and includes an insertion portion imaging unit 27 that images the insertion portion 1 side.

  According to this welding apparatus, it is possible to monitor the state of the insertion portion 1 by the insertion portion imaging means 27 when the insertion portion 1 is inserted into the pipe. As a result, it is possible to prevent the welding torch 11 and the pipe from being damaged by monitoring the insertion portion 1 so as not to contact the inner surface of the pipe.

  Further, in the welding apparatus of the present embodiment, the welding wire supply mechanism 24 includes a wire reel 241 around which the welding wire is wound, a wire delivery unit 243 that feeds the welding wire from the wire reel 241, and a winding wire wound around the wire reel 241. Wire reel take-up means 242 for energizing rotation in the take-off direction.

  According to this welding apparatus, since the welding wire is always wound around the wire reel 241 by the wire reel winding means 242, the welding wire wound around the wire reel 241 is not loosened, and the welding wire is appropriately sent during welding. It becomes possible. Further, it is necessary to reversely feed the welding wire after the completion of welding, and this reverse feeding can be performed.

DESCRIPTION OF SYMBOLS 1 Insertion part 1a Base member 2 Non-insertion part 11 Welding torch 11a Tip part 111 Welding cooling means 12 Welding torch moving mechanism 13 Welding wire support part 14 Temperature monitoring part 141 Temperature measuring means 142 Temperature measuring part imaging means 15 Welding monitoring part 151 Welding Section imaging means 152 Illumination means 153 Imaging cooling means 21 Support rod 22 Rotating movement mechanism 23 Axial movement mechanism 24 Welding wire supply mechanism 27 Insertion section imaging means 241 Wire reel 242 Wire reel winding means 243 Wire sending section S1 Axis

Claims (8)

An insertion part to be inserted inside the tube;
A non-insertion portion disposed outside the tube and disposing the insertion portion inside the tube;
A welding torch which is provided in the insertion portion and welds to the inner surface of the pipe in a state of being arranged inside the pipe;
A welding torch moving mechanism that is provided in the insertion portion and moves the welding torch in the radial direction of the pipe to which the tip of the welding torch faces;
A rotational movement mechanism that is provided at the non-insertion portion, and that rotates the support rod that is inserted into the tube with the insertion portion attached to the tip, about the axis of the support rod;
An axial movement mechanism that is provided in the non-insertion portion and moves the support rod along the extending direction of the shaft of the support rod;
A welding wire supply mechanism that is provided in the non-insertion portion and supplies the welding wire to the welding torch;
A welding apparatus comprising:   The welding torch is attached to a front end side of a base member extending in an axial direction in which the pipe extends, and the welding torch moving mechanism is attached to a rear end side of the base member, together with the base member, The welding apparatus according to claim 1, wherein the welding torch is moved.   A welding wire support that is provided in the insertion portion and movably supports the welding wire so that a tip of the welding wire approaches or separates from a tip of the welding torch; The welding apparatus according to claim 1, wherein the welding apparatus is provided so as to be movable together with the welding torch by the welding torch moving mechanism.   The welding torch is attached to a front end side of a base member extending in an axial direction in which the pipe extends, and the welding wire support portion is attached to a rear end of the base member, and the welding torch moves The welding apparatus according to claim 3, wherein the welding apparatus is connected to a moving member of the mechanism. A temperature measuring means for measuring an ambient temperature provided in the insertion portion and welded by the welding torch;
A temperature measurement unit imaging unit that is provided in the insertion unit and that images the vicinity measured by the temperature measurement unit;
A temperature monitoring unit cooling means which is provided in the insertion unit and cools the temperature measurement unit imaging means;
The temperature measuring unit, the temperature measuring unit imaging unit, and the temperature monitoring unit cooling unit are provided to be movable together with the welding torch by the welding torch moving mechanism. The welding apparatus as described in any one of these. A welded part imaging means provided in the insertion part for imaging the vicinity of the tip of the welding torch;
Illumination means provided on the insertion portion and illuminating the vicinity of the tip of the welding torch;
An imaging cooling means provided in the insertion portion, for cooling the welding portion imaging means and the illumination means;
The welding part imaging means, the illumination means, and the imaging cooling means are provided so as to be movable together with the welding torch by the welding torch moving mechanism. The welding apparatus as described in one.   The welding apparatus according to claim 1, further comprising an insertion portion imaging unit that is provided on the support rod and that images the insertion portion side.   The welding wire supply mechanism includes a wire reel around which the welding wire is wound, a wire feeding unit that feeds the welding wire from the wire reel, and a wire that urges rotation in the winding direction of the welding wire in the wire reel. The welding apparatus according to claim 1, further comprising a reel winding unit.

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