JP2008188650A - Underwater welding equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide underwater welding equipment which can completely drain water collected in the opening part for operation and which can weld an arbitrary operation face including the floor. <P>SOLUTION: The underwater welding equipment includes: a chamber 1 in which the operation opening part 11 and a drain 12 are installed; a welding torch 2 housed in the chamber 1; an adsorption pad 8 for fixing the chamber on an operation face; and gas supply lines 15a-15h for feeding gas from the outside into the chamber 1. In a position surrounding the operation opening part 11 in the exterior of the chamber 1, there is provided a sealing packing 13 having water permeability and springiness. The chamber 1 is fixed on the operation face using the adsorption pad 8, a required gas is introduced into the chamber 1 through the gas supply lines 15a-15c, and water inside the chamber 1 is discharged outside through the drain 12 and the sealing packing 13. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an underwater welding apparatus, and more particularly, to an underwater welding apparatus suitable for repair welding a maintenance place such as a metal plate-lined pool, container, equipment, etc. provided in a nuclear power plant and spent fuel storage facility. .

  For example, a spent fuel reprocessing facility has a metal plate-lined pool for storing spent fuel. For repairing a metal plate (lining) stretched on the inner peripheral surface of the pool, a pool is used. A technique using an underwater welding apparatus that repairs a necessary portion by welding by remote control from outside the pool without removing spent fuel and water inside is known.

  This type of underwater welding equipment includes a chamber (dry box) with a working opening and a drain opening, a welding torch housed in the chamber, and a suction pad (suction cup) that fixes the chamber to a required work surface. ), A gas supply line for supplying gas from the outside into the chamber, a cable for supplying power and control signals from the outside into the chamber, and a non-permeable property provided at a position surrounding the working opening on the outer surface of the chamber When the chamber is fixed to the required work surface via the packing and the required gas such as shield gas or dry air is introduced into the chamber from the gas supply line, the water in the chamber is passed through the drain port. (For example, refer to Patent Document 1) is known.

Moreover, in this kind of underwater welding apparatus, what further provided with the to-be-welded object attachment apparatus in the chamber (for example, refer patent document 2), and moves a welding torch in a X, Y, Z-axis direction in a chamber. There is also known one that further includes a welding torch moving mechanism (for example, see Patent Document 3).
JP 2004-154838 A JP 11-138259 A JP-A-60-196264

  However, an underwater welding apparatus of a type that includes a water-impermeable packing and seals the working opening of the chamber with the packing, and discharges the water in the chamber to the outside through the drain port is provided at the working opening. Since the accumulated water cannot be discharged, as is clear from the examples of Patent Documents 1 to 3, the opening position of the working opening is limited only to the side surface of the chamber, and the floor surface of the metal plate-lined pool is used. There is a problem that it is difficult to provide a weldable underwater welding apparatus.

  The present invention has been made in view of the above circumstances, and the problem is that the water accumulated in the work opening can be completely discharged and welding of any work surface including the floor surface is possible. It is an object of the present invention to provide an underwater welding apparatus capable of performing the above.

  In order to achieve the above object, the present invention firstly fixes a chamber having a working opening and a drain opening, a welding torch housed in the chamber, and the chamber to an underwater work surface. In an underwater welding apparatus comprising a suction pad and a gas supply line for supplying gas from the outside into the chamber, a seal packing having water permeability and elasticity is provided at a position surrounding the working opening on the outer surface of the chamber. When the required gas is introduced into the chamber from the gas supply line through the suction pad, water that has entered the chamber passes through the drain port and the seal packing. It was configured to discharge to the outside.

  According to such a configuration, the required gas is introduced into the chamber installed on the required work surface, and the pressure in the chamber is made higher than the external pressure, so that the water accumulated in the chamber can be removed from the drain port and the seal packing. Since the work opening provided can be discharged to the outside, the work opening can be opened on the bottom surface of the chamber, and an underwater welding apparatus capable of welding any work surface including the floor surface. Can do.

  Secondly, in the underwater welding apparatus of the first configuration, the present invention is configured such that the drain port is opened at four corners of the bottom plate of the chamber.

  According to such a configuration, even when a chamber is installed on a work surface having a gradient, water accumulated in the chamber can be easily discharged to the outside, so that the versatility of the underwater welding apparatus can be further improved.

  Thirdly, according to the present invention, in the underwater welding apparatus of the first configuration, a plurality of the drain ports are opened in the chamber, and a shielding plug is provided on one or a plurality of the plurality of drain ports. It was configured to be detachable.

  According to such a configuration, unnecessary drainage ports in view of the usage mode of the underwater welding apparatus can be appropriately blocked with a shielding plug, so that more gas is introduced into the chamber than when all drainage ports are opened. The amount can be reduced, and the welding operation can be performed at low cost.

  Fourthly, in the underwater welding apparatus according to the first aspect of the present invention, a plate thinner than the thickness of the seal packing is provided on the seal packing mounting surface of the chamber, and the chamber is fixed to the work surface by the suction pad. Then, the plate abuts against the work surface, and the compression amount of the seal packing is limited to a range where water can be passed.

  According to such a configuration, even when the chamber is installed on a predetermined work surface using the suction pad, the water permeability of the seal packing is ensured, so that the water accumulated in the chamber can be surely discharged. Further, since it is only necessary to fix a plate having a required thickness to the outer surface of the chamber, it can be carried out easily and inexpensively.

  Fifthly, in the underwater welding apparatus according to the first aspect of the present invention, the chamber further includes a welding torch moving mechanism capable of moving the welding torch in three directions orthogonal to each other, and the welding torch moving mechanism includes: The welding torch is moved along the required welding direction, and the welding torch is moved in a direction perpendicular to the welding surface, so that the arc length of the arc generated between the welding torch and the welded portion is controlled to be constant. It was configured to do.

  According to such a configuration, since the position of the welding torch with respect to the welded portion can be changed three-dimensionally, the necessary welding work can be quickly performed regardless of the shape of the welded portion, and the arc during welding can be stably maintained. Can perform quality welding.

  According to the sixth aspect of the present invention, in the underwater welding apparatus of the first configuration, the welding torch is any one of a TIG welding torch, a MIG welding torch, a plasma welding torch, and a laser welding torch.

  According to such a configuration, an appropriate welding torch can be used according to the content of the welding operation to be performed, so that the underwater welding apparatus can be applied to a wide range of applications.

  Seventhly, in the underwater welding apparatus of the first configuration, the present invention further includes a workpiece attachment device in the chamber, and the workpiece attachment device grips the workpiece. And a workpiece pressing portion for pressing the workpiece gripped by the workpiece gripping portion against a required repair site, and the workpiece gripping portion and the workpiece pressing portion are provided with the gas supply It was configured to be driven by air pressure supplied from outside through the line.

  According to such a configuration, the workpiece can be gripped and pressed against the repair location by the workpiece attachment device, so that it can be applied to a repair operation in which a contact plate is applied to the repair location and its periphery is welded. .

  In the underwater welding apparatus of the present invention, a seal packing having water permeability and elasticity is provided at a position surrounding the working opening on the outer surface of the chamber, the chamber is fixed to the working surface by the suction pad, and the gas supply line is connected to the inside of the chamber. When the required gas is introduced into the chamber, the water that has entered the chamber is discharged to the outside through the drain port and the seal packing, so it is possible to open a working opening on the bottom surface of the chamber, including any floor surface The work surface can be welded.

  Hereinafter, an embodiment of an underwater welding apparatus according to the present invention will be described with reference to the drawings.

  1 is a sectional view of the underwater welding apparatus according to the embodiment in use, FIG. 2 is a perspective view seen from the bottom side of the chamber according to the embodiment in which the suction pad is omitted, and FIG. 3 is a welding torch and welding according to the embodiment. FIG. 4 is a configuration diagram of a workpiece attachment device according to the embodiment, and FIG. 5 is an explanatory diagram illustrating a setting state of the underwater welding device according to the embodiment on a pool bottom surface.

  As shown in FIG. 1, the underwater welding apparatus of this example includes a chamber 1 for exposing a gas phase state in water, and the welding torch 2 and the welding torch 2 are orthogonal to each other in the chamber 1. A welding torch moving mechanism 3 that holds it movably in three directions, a wire supply box 4 that supplies a welding wire to the welding torch 2, and an object to be welded such as a contact plate, and presses it against a required repair site. A workpiece attachment device 5, a monitoring camera 6 for visually monitoring the state in the chamber 1, and an illumination device 7 attached thereto are housed. Further, a suction pad 8 and its drive actuator 9 for fixing the chamber 1 to a required work surface are attached to the outer surface of the chamber 1. 1 denotes a metal plate-lined pool for storing spent fuel, and B denotes a lining stretched on the inner peripheral surface of the pool A.

  As shown in FIGS. 1 and 2, the chamber 1 is formed in a box shape with a metal plate such as a stainless steel plate, and a working opening 11 is opened in a portion extending from a part of the bottom surface to a part of the side surface. The drain port 12 is opened at the four corners of the bottom. Further, a seal packing 13 made of a material having appropriate water permeability and elasticity is attached to a position surrounding the work opening 11 on the outer surface of the chamber 1, and on the same surface as the seal packing 13. A resin plate 14 having a small thickness is attached. The seal packing 13 is formed with a water-permeable sponge or the like, and is attached to the outer surface of the chamber 1 by adhesion or the like. On the other hand, the plate 14 is attached to the outer surface of the chamber 1 by screwing or the like.

  Further, the chamber 1 is connected to gas supply lines 15a to 15h for supplying necessary shield gas and dry gas from the outside, and a cable 17 for supplying electric power and control signals. A gas supply line 15a shown in FIG. 1 is a main gas line for supplying gas into the chamber 1, a gas supply line 15b is a gas supply line to the wire supply box 4, and a gas supply line 15c is a gas supply line to the welding torch 2. Supply line. As these lines and cables, those usable in water are used.

  As the welding torch 2, a TIG welding torch, a MIG welding torch, a plasma welding torch, a laser welding torch, or the like can be appropriately provided depending on the content of the welding operation to be performed. As shown in FIG. 1, the welding torch 2 includes a wire supply port 18 that supplies the wire 4 a fed from the wire supply box 4 to the welding portion, and a wire that changes the direction of the wire 4 a according to the attitude of the welding torch 2. A rotating shaft 19 and a welded part monitoring camera 20 for adjusting a welding position and checking an abnormality during welding are attached. Note that a dedicated camera with a filter cover is used as the weld monitoring camera 20 in order to block the strong light emitted during welding so that necessary monitoring can be performed. Moreover, in order to make adjustment of a welding position easy, the some welding part monitoring camera 20 can also be provided.

  As shown in FIG. 3, the welding torch moving mechanism 3 includes an X-direction transfer unit 21 that transfers the welding torch 2 in the X direction (horizontal direction), a Y-direction transfer unit 22 that transfers the welding torch 2 in the Y direction (vertical direction), And a Z-direction transfer portion 23 that transfers in the Z direction (paper surface direction). The welding object C such as a backing plate pressed against the repaired portion of the metal plate-lined pool A by the welding object attachment device 5 The welding torch 2 is moved so that the outer periphery and the lining B are welded. The welding torch moving mechanism 3 can also include a welding torch rotating unit for adjusting the inclination angle of the welding torch 2 with respect to the welding surface.

  The welding torch moving mechanism 3 has a function of confirming the attachment state of the contact plate C to the lining B by measuring the gap between the lining B and the contact plate (workpiece) C. That is, in the welding torch moving mechanism 3 of this example, when the tip of the welding torch 2 comes into contact with the surface of the lining B or the surface of the backing plate C, they are electrically connected through the ground cable of the welding power source. The X direction transfer part 21, the Y direction transfer part 22 and the Z direction transfer part 23 are automatically stopped by using the welding torch when the tip of the welding torch 2 is brought into contact with the surface of the lining B. 2 and the difference between the (X, Y, Z) coordinate value of the welding torch 2 and the (X, Y, Z) coordinate value of the welding torch 2 when the tip of the welding torch 2 is brought into contact with the surface of the contact plate C. By subtracting the plate thickness of the plate C, the gap between the lining B and the backing plate C can be measured. The calculation of the gap can be performed by a control / monitoring panel 41 (see FIG. 6) that supplies a control signal or the like to the welding torch moving mechanism 3.

  When a TIG welding torch is used as the welding torch 2, the welding torch moving mechanism 3 is provided with an AVC (Ark Voltage Control) control function for keeping the voltage during welding constant. Here, the AVC control is arc voltage feedback control, and controls the arc length by controlling the torch height and the wire supply speed so that the arc voltage becomes constant. Usually, the AVC control function is configured to control a dedicated transfer unit independent of the control of each transfer unit in the X direction, the Y direction, and the Z direction. By integrating the control of the direction transfer units 21, 22, 23 and the AVC control, the apparatus can be made compact.

  The wire supply box 4 automatically sends out an appropriate amount of wire to the welded portion as the welding operation proceeds. The wire supply box 4 is connected to the gas line 15b as described above, and the shield gas supplied through the gas line 15b causes water to enter the wire supply line from the wire supply box 4 to the wire supply port 18. Intrusion is prevented.

  As shown in FIG. 4, the workpiece attachment device 5 includes a workpiece gripping portion 31 that grips the workpiece C, and an X-direction workpiece pressing portion 32 that presses the workpiece C against the wall surface of the repair site. The welding object pressing portion 33 that presses the workpiece C against the floor surface of the repair site, and the workpiece C held by the workpiece holding portion 31 is transferred from the chamber 1 to the outside of the chamber 1. It is comprised from the thing transfer part 34. FIG. Each of these parts 31 to 34 is configured with a pneumatic actuator, and is driven by dry air supplied through gas supply lines 15d to 15g.

  The monitoring camera 6 and the illumination device 7 are used for checking the dry state of the repaired part, confirming the shape of the lining B, and confirming the abnormality of the weld bead, and the necessary number is provided in the necessary direction.

  As shown in FIG. 5, a plurality of suction pads 8 and their drive actuators 9 are set at positions where the chamber 1 is fixed to the wall surface and floor surface of the metal plate-lined pool A which is the work surface. If the chamber 1 can be reliably fixed to the work surface, it is not always necessary to set a plurality of each work surface, and it is sufficient to set one by one. These suction pads 8 and their driving actuators 9 are driven by dry air supplied through a gas supply line 15h, as shown in FIG.

  Hereinafter, the welding repair method of the lining B using the underwater welding apparatus comprised in this way is demonstrated using FIG.6 and FIG.7. FIG. 6 is an explanatory view showing an installation state of the underwater welding apparatus in the metal plate-lined pool A, and FIG. 7 is a cross-sectional view showing a state of the welding torch 2 during welding.

  Before being suspended in the metal plate-lined pool A, the underwater welding apparatus of the present invention is connected to the control / monitoring panel 41 disposed outside the pool via the gas supply lines 15a to 15h and the cable 17. The control / monitoring panel 41 is connected to a power source 42, a shield gas source 43, and a dry air source 44. Furthermore, a required workpiece (in the case of this example, a L-shaped cross section) C is gripped by the workpiece gripping portion 31 of the workpiece mounting device 5, and this workpiece C Is accommodated in the chamber 1 by driving the workpiece attachment device 5.

  The descent of the underwater welding apparatus into the metal plate-lined pool A is performed using a crane D. The control / monitoring panel 41 starts supplying dry air into the chamber 1 through the gas supply lines 15a to 15c before the underwater welding apparatus is submerged, and makes the pressure in the chamber 1 higher than the external pressure. Minimize the inflow of water into the chamber 1 when submerged. Further, by supplying dry air to the wire supply box 4, water can be prevented from entering the wire supply line.

  After operating the crane D to position the chamber 1 at a location where the lining B needs to be repaired, the suction pad 8 and its drive actuator 9 are driven through the gas supply line 15h to fix the chamber 1 to the required repair site. By driving the suction pad 8 and its drive actuator 9, the seal packing 13 is compressed and the outer surface of the plate 14 is brought into contact with the surface of the lining B. Therefore, even in this state, the water permeability of the seal packing 13 is ensured.

  The water that has entered the chamber 1 is discharged to the outside from the drain port 12 by the pressure of the dry air introduced into the chamber 1 and permeates the seal packing 13 provided around the work opening 11. Discharged outside. If the water that has entered the chamber 1 cannot be discharged, the welding torch 2 is directed to the remaining portion of the water droplets, and the dry air supplied from the gas supply line 15c is sprayed in a spot manner so that the water droplets are discharged. Then, the gas is discharged from the work opening 11 or the drain 12. Thereby, the work surface which faces the inside of the chamber 1 and the opening 11 for work can be dried, and the welding repair of the floor surface of the metal plate lining type pool A is attained.

  After the drying is finished, the workpiece gripping portion 31, the X-direction workpiece welding pressing portion 32, the Y-direction workpiece welding pressing portion 33, and the workpiece transfer constituting the workpiece mounting device 5 through the gas supply lines 15d to 15g. The part 34 is driven, and the contact plate C is pressed against the repaired portion of the lining B (in this example, the corner between the floor surface and the wall surface of the metal plate-lined pool A) as shown in FIG. Next, as shown in FIG. 7, the tip of the welding torch 2 is brought into contact with the surface of the lining B and the surface of the backing plate C, respectively, and the gap between the lining B and the backing plate C is measured. When the gap is appropriate, the gas supplied into the chamber 1 through the gas supply lines 15a to 15c is switched to the shield gas (inert gas), and the welding torch 2 and the welding torch moving mechanism 3 are driven. Temporary welding of the backing plate C to the lining B is performed over three or more points.

  The dry state of the chamber 1 and the repaired part, and the attachment state of the lining B to the repaired part can be monitored by the control / monitoring panel 41 through the monitoring camera 6 provided in the chamber 1, and the temporary welding state is The control / monitoring panel 41 can be used for monitoring through the weld monitoring camera 20 attached to the welding torch 2.

  When the tack welding is completed, dry air is supplied to the workpiece gripping portion 31 of the workpiece mounting device 5 through the gas supply line 15d, and the contact plate C is opened. Next, dry air is supplied to the X-direction workpiece weld pressing portion 32, the Y-direction workpiece welding pressing portion 33, and the workpiece transport portion 34 of the workpiece attachment device 5 through the gas supply lines 15e to 15g, and the workpiece is welded. The attachment device 5 is moved to a required storage position set in the chamber 1. In this state, it is confirmed again that the backing plate C is temporarily welded to the repaired portion of the lining B through the welded part monitoring camera 20, and the workpiece attachment device 5 is driven to drive the backing plate C and the lining. Measure the gap amount with B again.

  When it is confirmed that the state of the tack welding and the gap amount are appropriate, the groove surface of the welded part is confirmed through the welded part monitoring camera 20. Thereafter, the operator operates the control / monitoring panel 41 to perform teaching work for storing movements for welding to the welding base 2. Teaching of the welding operation is performed while confirming the welding position through the weld monitoring camera 20. First, the welding torch part 2 is moved to the welding start position to teach the starting point, and the welding torch 2 is moved along the required welding line from this starting position to teach the welding passing point. Finally, the welding torch 2 is moved to the required welding end point, and the end point is taught. It should be noted that the passing point is not necessarily one place. For example, when a complicated shape is welded, more detailed teaching of the welding operation can be performed.

  When teaching of the welding operation to the welding torch 2 is completed up to the welding end point, after the welding torch 2 is moved to the welding start position, the continuous operation is confirmed without generating a welding arc. After confirming the continuous operation, the welding torch 2 is moved again to the welding start position, and the first layer welding of the contact plate C and the lining B is performed. After the completion of the first layer welding, the appearance of the first layer weld bead is observed through the weld monitoring camera 20. The first layer welding is performed by welding each side of the backing plate C in order.

  In the welding of the backing plate C and the lining B, for example, it is assumed that a welding defect such as a penetration defect occurs in the welding bead in the first layer welding. We have decided to carry out welding. Therefore, when the welding of each side of the backing plate C is completed in the first layer welding, the lamination welding after the first layer welding is subsequently performed. Lamination welding is also performed in the same procedure as the above-mentioned first layer welding. After the lamination welding, the appearance confirmation of the weld bead is performed for each welding execution through the weld monitoring camera 20.

  After the lamination welding is completed, dry air is supplied to the drive actuator 9 through the gas supply line 15h, and the drive actuator 9 is returned to its original position. As a result, water enters from the work opening 11 and the drain port 12, and the inflow of water into the chamber 1 is confirmed by the monitoring camera 6. Next, dry air is supplied to the suction pad 8 through the gas supply line 15 h, the negative pressure of the suction pad 8 is released, the chamber 1 is removed from the lining B, and the crane D is pulled out of the metal plate-lined pool A.

  The underwater welding apparatus of this example opens the working opening 11 in the portion extending from the bottom surface to the side surface of the chamber 1 and opens the drain port 12 on the bottom surface of the chamber 1, so that the wall surface and the floor surface can be repaired simultaneously. Can do. Further, since the water-permeable seal packing 13 is provided around the work opening 11, gas is introduced into the chamber 1 installed on the required work surface, and the pressure in the chamber 1 is made higher than the external pressure. Thus, the water accumulated in the chamber 1 can be discharged to the outside from the work opening 11, and the work opening 11 can be opened on the bottom surface of the chamber 1. The work surface can be welded. Further, since the drainage ports 12 are opened at the four corners of the bottom plate of the chamber 1, the water accumulated in the chamber 1 can be easily discharged to the outside even when the chamber is installed on a work surface having a gradient. In addition, a plate 14 thinner than the thickness of the seal packing 13 is provided on the seal packing mounting surface of the chamber 1, and the compression amount of the seal packing 13 when the chamber 1 is fixed to the work surface is limited. The water permeability of the seal packing can be ensured, and the water accumulated in the chamber 1 can be surely discharged. In addition, since the welding torch moving mechanism 3 capable of moving the welding torch 2 in three directions orthogonal to each other is provided in the chamber 1, necessary welding operations can be performed quickly and with high quality. Furthermore, since the underwater welding apparatus of this example is provided with the workpiece attachment device 5 in the chamber 1, it can be applied to a repair work of a method in which a contact plate is applied to a repair location and its periphery is welded.

  In the above embodiment, a total of four drain ports 12 are opened at the four corners of the bottom surface of the chamber 1, but the number and locations of the drain ports 12 are not limited to this, and the necessary locations The required number of drain ports 12 can be opened.

  In the case where a plurality of drain ports 12 are opened in the chamber 1, the drain port 12 that is unnecessary in view of the usage mode of the underwater welding apparatus can be appropriately closed with a shielding plug. In this way, since the amount of gas introduced into the chamber 1 can be reduced as compared with the case where gas is introduced with all the drain ports 12 open, the amount of gas consumed can be saved and the welding operation can be performed quickly. The cost required for welding work can be reduced.

  Moreover, in the said embodiment, although the repair of the wall surface and floor surface of the pool A was performed using the underwater welding apparatus by which the opening part 11 for work was opened in the part ranging from the bottom face to the side surface of the chamber 1, FIG. As shown in Fig. 5, the same underwater welding apparatus can be used to repair the wall surface of the pool A and the other wall surfaces following it. In this case, in order to improve the water drainage in the chamber 1, it is desirable to open the drainage port 12 on the surface facing the floor surface of the pool A as shown in FIG.

  Furthermore, in the said embodiment, although the underwater welding apparatus with which the opening 11 for work was opened in the part ranging from the bottom face of the chamber 1 to the side surface was used, as shown in FIG. It is also possible to open the working opening 11 only in the case of (). In this case, as shown in FIG. 9, only one work surface such as the wall surface or floor surface of the pool A can be repaired.

It is sectional drawing of the use condition of the underwater welding apparatus which concerns on embodiment. It is the perspective view seen from the bottom face side of the chamber which concerns on embodiment which abbreviate | omitted the suction pad. It is a lineblock diagram of a welding torch and a welding torch moving mechanism concerning an embodiment. It is a block diagram of the to-be-welded object attachment apparatus which concerns on embodiment. It is explanatory drawing which shows the setting state to the pool bottom face of the underwater welding apparatus which concerns on embodiment. It is explanatory drawing which shows the installation state of the underwater welding apparatus in the metal plate lining type pool. It is sectional drawing which shows the state of the welding torch 2 at the time of welding. It is explanatory drawing of the underwater welding apparatus which concerns on other embodiment. It is explanatory drawing of the underwater welding apparatus which concerns on other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chamber 2 Welding torch 3 Welding torch moving mechanism 4 Wire supply box 5 Workpiece attachment device 6 Monitoring camera 7 Illumination device 8 Suction pad 9 Drive actuator 11 Work opening 12 Drainage port 13 Seal packing 14 Plates 15a to 15h Gas supply Line 17 Cable A Metal plate-lined pool B Lining C Workpiece (pad)

Claims (7)

A chamber in which a working opening and a drain opening are opened, a welding torch housed in the chamber, a suction pad for fixing the chamber to an underwater work surface, and a gas for supplying gas from the outside into the chamber In an underwater welding apparatus with a supply line,
A seal packing having water permeability and elasticity is provided at a position surrounding the working opening on the outer surface of the chamber, the chamber is fixed to the working surface by the suction pad, and the gas supply line enters the chamber. An underwater welding apparatus, wherein when a required gas is introduced, water that has entered the chamber is discharged to the outside through the drain port and the seal packing.   The underwater welding apparatus according to claim 1, wherein the drain port is opened at four corners of a bottom plate of the chamber.   2. The underwater welding according to claim 1, wherein a plurality of the drain ports are opened in the chamber, and a shielding plug is detachably attached to one or a plurality of the plurality of drain ports. apparatus.   A plate thinner than the thickness of the seal packing is provided on the seal packing mounting surface of the chamber, and when the chamber is fixed to the work surface by the suction pad, the plate abuts on the work surface and the seal packing is compressed. The underwater welding apparatus according to claim 1, wherein the amount of water is limited to a range in which water can be passed.   A welding torch moving mechanism for moving the welding torch in three directions orthogonal to each other is further provided in the chamber. The welding torch moving mechanism moves the welding torch along a required welding direction, and moves the welding torch. The underwater welding apparatus according to claim 1, wherein the arc length of the arc generated between the welding torch and the welded portion is controlled to be constant by moving in a direction perpendicular to the welding surface.   The underwater welding apparatus according to claim 1, wherein the welding torch is any one of a TIG welding torch, a MIG welding torch, a plasma welding torch, and a laser welding torch.   The apparatus further includes a workpiece attachment device in the chamber, and the workpiece attachment device requires a workpiece gripping portion for gripping the workpiece and a workpiece gripped by the workpiece gripping portion. And a workpiece pressing portion to be pressed against the repair site, and the workpiece holding portion and the workpiece pressing portion are driven by air pressure supplied from the outside through the gas supply line. The underwater welding apparatus according to claim 1.

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