KR20190010751A - Welding device for overlaying containment liner plate - Google Patents

Abstract

The present invention relates to a welding device for overlaying a containment liner plate (CLP). The welding device for repairing a part reduced in thickness as a result of corrosion includes a base portion provided with an electromagnet, a drive control unit provided so as to be supported in the base portion and driven remotely and axially, an arm portion provided on one side of the drive control unit and formed so as to be long and have a constant width so as to be inserted into a gap where an exposed part reduced in thickness is positioned, and a welding portion provided at one end of the arm portion driven together by the drive control unit such that the exposed part reduced in thickness is overlaid and welded in the gap. With the present invention, a corrosion defect part of the CLP exposed part in the gap hardly accessible by a worker can be repaired by overlaying welding, and thus CLP integrity can be ensured. In addition, overlaying welding automation can be realized with the welding device for overlaying a containment liner plate.

Description

[0001] WELDING DEVICE FOR OVERLAYING CONTAINMENT LINER PLATE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding apparatus, and more particularly, to a welding apparatus for welding a liner plate surface.

The containment of the nuclear power plant is made of thick concrete and the inner wall of the outer wall is provided with a liner plate made of carbon steel (hereinafter, the liner plate in the containment building is referred to as 'CLP'). . These CLPs are formed to enclose the inside of the containment building, thereby preventing external leakage of the radiation material generated in the containment building.

However, the thickness of the CLP is reduced due to the natural corrosion as a long time passes. If such corrosion continues, some parts of the CLP of the power plant may reach a level that does not satisfy the minimum thickness design requirement, which may directly lead to fatal damage due to radiation leakage, so that the thinning site is required to be repaired.

The thickness reduction can be classified into thickness reduction for the exposed portion and thickness reduction for the non-exposed portion, which is the contact portion of the concrete on the back surface. For the corrosion to the exposed portion, Is required.

Conventionally, such repair work has been carried out in a manner of carrying out upbringing only for CLP which can be directly accessed by the operator. However, some thinning sites also occur in concrete slabs, which are internal structures, or in seismic gaps, which are in close contact with walls, and there is a problem in that maintenance work itself can not be performed because the operator can not access these sites. In addition, there has been a problem that the repair worker must be separately set up, the work time is increased, and the welding quality is uneven depending on the manually operated maintenance work of the worker for sporadic and continuous thinning sites.

The present invention solves the above problems, and it is an object of the present invention to provide a method of repairing corrosion defects on the surface of a CLP located in a gap with a concrete slab or wall that is difficult for a worker to permanently repair all corrosion defects of the CLP The purpose of the present invention is to provide a nuclear CLP uplifting welding apparatus which can be implemented.

Further, it is an object of the present invention to provide a nuclear CLP uplifting welding apparatus which automates the up-and-down welding process for a thickness thinning region, thereby reducing the work time and manpower while uniformizing the welding quality.

The present invention relates to a welding apparatus for a nuclear CLP uplifting welding apparatus for repairing a portion reduced in thickness by corrosion, the welding apparatus comprising: a base portion having an electromagnet; a drive control portion that is supported by the base portion, And an arm portion provided at one side of the arm portion driven together by the drive control portion and having a thickness reduced in thickness in a gap, And a welded portion for allowing the exposed portion to be welded.

Further, the drive control section is provided with a left-right moving means and a vertical moving means.

The driving control unit may further include a horizontal moving unit.

In addition, the drive control unit may further include a manual handle so that the operator can manually drive the apparatus in the left-right direction.

Further, a welding material supply unit is provided to continuously supply the welding material to the welding unit.

The arm portion is provided with a tube so that the welding material is supplied along the longitudinal direction of the arm portion, and the welding material supplied from the welding material supplying portion is transferred to the welding portion.

Further, the arm portion is configured to be changeable according to the shape of the gap to be inserted.

The arm portion may include a bracket portion formed at one side of the driving control portion and a replacement arm having a coupling piece detachably attached to the end portion of the bracket portion.

Further, the welding portion is characterized in that a welding work space having a thickness smaller than the gap is provided so as to perform the upset welding on the exposed portion where the thickness is reduced in a state of being inserted in the gap.

In addition, the welding work space is provided with a torch for melting the welding material to be supplied, and a first observation camera for observing the molten state by the torch toward the torch is provided apart from the torch .

Further, in the welding work space, a second observation camera is further provided on the opposite side of the first observation camera so as to observe the welding quality as a whole.

In addition, the second observation camera is provided so as to face at least two or more welding work spaces.

Further, any one of the second observation cameras is attached to the arm portion outside the welding work space, and is disposed to face the welding work space.

Further, the welding operation space is provided with a tip removing portion on the opposite side of the torch.

In addition, at least one or more electromagnets are provided on both sides of the base portion.

Further, the replacement arm is formed in a linear shape.

Further, the replacement arm is formed in a refraction type.

Further, the replacement arm is formed in an arcuate shape.

According to the present invention, by applying the nuclear power CLP uplifting welding apparatus of the present invention, it is possible to repair the CLP exposed portion of the corrosion defective portion in the gap that is difficult for the operator to carry out by the upward welding, and thus the integrity of the CLP can be secured.

In addition, it is possible to realize the automation of the upsetting welding for the thickness thinning region caused by the corrosion, thereby improving the working efficiency.

Furthermore, it will be able to implement permanent repair of all corrosion defect corrosion defects in the nuclear power plant CLP.

However, the effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is an overall cross-sectional view of one embodiment of a containment building in which the present invention is required.
FIG. 2 is an enlarged view of a portion of the containment building of FIG. 1, illustrating an appearance of a thickness reduction zone.
FIG. 3 is a view showing an entire embodiment of a nuclear CLP uplifting welding apparatus according to the present invention.
FIG. 4 is a top view of the nuclear CLP uplifting welding apparatus of FIG. 3. FIG.
5 is an enlarged view of a welded portion of the present invention.
FIG. 6 is a top view of the weld in FIG. 5; FIG.
FIG. 7 is a view showing a state in which a thinning portion occurring in a vertical gap is used for repairing a nuclear CLP up-welding apparatus according to an embodiment of the present invention.
FIG. 8 is a view showing the welding apparatus of the nuclear power CLP shown in FIG. 7 used for repairing other thinning sites by moving the position.
9 is a view showing a state in which a thinning portion occurring in a horizontal gap according to an embodiment of a nuclear CLP up-welding apparatus of the present invention is used for repairing a thinning region.
10 is a view showing a state in which a thinning portion occurring in a vertical gap in which an obstacle exists is used for repairing a thinning portion according to another embodiment of the nuclear CLP uplifting welding apparatus of the present invention.

Hereinafter, the present invention will be described in detail with reference to embodiments and drawings of the present invention. It will be apparent to those skilled in the art that these embodiments are provided by way of illustration only for the purpose of more particularly illustrating the present invention and that the scope of the present invention is not limited by these embodiments .

Also, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains and, where contradictory, Will be given priority.

In order to clearly illustrate the claimed invention, parts not related to the description are omitted, and like reference numerals are used for like parts throughout the specification. And, when a section is referred to as "including " an element, it does not exclude other elements unless specifically stated to the contrary. In addition, "part" described in the specification means one unit or block performing a specific function.

In each step, the identification code (first, second, etc.) is used for convenience of explanation, the identification code does not describe the order of each step, and each step does not explicitly list a specific order in the context May be performed differently from the above-described sequence. That is, each of the steps may be performed in the same order as described, or may be performed substantially concurrently or in the reverse order.

1 is an enlarged view of a portion of the containment building C of FIG. 1, in which a thickness thinning zone X is shown Fig.

Referring to FIG. 1, in order to shield radiation generated when a nuclear power plant is operated, the outer wall 21 of the containment building N is constructed of thick concrete, and an inner wall of the outer wall 21 is formed with carbon steel A liner plate 22 is provided.

Inside the containment building N, slabs 23 and load bearing walls are installed to support various facilities including reactors and the like and the load of the operator. Here, the slabs 23 or the bearing walls form a certain gap for earthquake-proof in the portions R1, R2, R3 contacting the thick concrete outer wall 21. Specifically, the R1 and R3 portions are the earthquake-induced clearance in contact with the slab 23, and R2 is the earthquake-proof gap in contact with the bearing wall.

2 is a conceptual enlargement of the portion R1 of FIG. 1. Referring to FIG. 2, the slab 23 directly contacts the inner wall of the outer wall 21 for an earthquake-proof function, (30) is formed.

As in the other portions, spontaneous corrosion due to elapse of a long time can not be avoided in the gap 30. The thickness thinning zone X is generated and grown in the gap 30 so that the liner plate 22 of the thinner thickness zone X is less than the minimum thickness requirement of 5.4 mm and the maintenance is required .

When the thinned portion X of the liner plate 22 in the containment C is generated in the exposed portion of the gap 30 (the left side portion of the liner plate in FIG. 2) The present invention will now be described in detail with reference to the accompanying drawings.

FIG. 3 is a view showing an entire embodiment of a nuclear CLP up-welding apparatus 10 according to the present invention, and FIG. 4 is a top view of the nuclear-power CLP up-welding apparatus 10 of FIG.

The present invention relates to a device for welding a thickened portion by corrosion, and more particularly to a device for welding a corrosion-defective portion, such as an earthquake-proof gap, A driving control unit 200, an arm unit 300, and a welding unit 400.

The base unit 100 includes an electromagnet 110. The electromagnet 110 may be detachably attached depending on whether power is supplied or not. That is, when power is applied to the electromagnet 110, an adhesive force is generated on the liner plate 22 made of carbon steel, so that the present invention can be attached to a desired position. In addition, the operator can perform maintenance work by repairing any one thinning site X and then attaching the same to the periphery of another thinning site X physically separated from the thinning site X (see FIGS. 7 and 8) .

Preferably, at least one electromagnet 110 is provided on both sides of the base 100 so that the electromagnets 110 can be stably attached while maintaining balance when the present invention is mounted on the liner plate 22 do.

On the other hand, the adhesive force of the electromagnet 110 is sufficient to pull the angle or studs (not shown) of the metal embedded in the back surface of the liner plate 22 so as to sufficiently support the apparatus during the welding operation It is enough to be able to be.

In addition, since the base 100 is provided with the electromagnet 110, the ease of movement is improved. Thus, the operator can efficiently repair the thinning region X of the exposed portion that occurs sporadically with a relatively small area.

The drive control unit 200 is provided to be supported by the base unit 100 and is driven by multiple axes remotely. The driving control unit 200 is provided with the horizontal movement unit 210 and the vertical movement unit 220 so that the arm unit 300 and the weld unit 400 to be described later can be remotely driven in a planar manner as in the left and right direction and the up and down direction .

In this specification, the left-right direction and the up-down direction refer to a longitudinal direction (lateral direction in FIG. 3) and a perpendicular direction (longitudinal direction in FIG. 3) of the arm portion 300 to be described later. In other words, when the present invention is installed to repair the thinning zone X formed in the vertical gap 31, the X axis of the liner plate 22 means the left and right direction and the Y axis means the up and down direction 7 and 8). Conversely, when the present invention is installed to repair the thinning zone X formed in the horizontal gap 32, the Y axis of the liner plate 22 means the left and right direction and the X axis means the up and down direction 9).

The X-axis and the Y-axis are respectively formed with a small area of 2 to 3 inches each. Considering the thickness of the exposed portion, the weight of the entire apparatus, and the convenience of the movement, the left and right moving means 210 and the up and down means 220 are preferably driven within 100 to 250 mm.

The base portion 100 of the apparatus is attached at an appropriate position so that the thinning portion X of the exposed portion is included in the welding range by the left and right moving means 210 and the vertical moving means 220, And at least one blow-up welding is carried out. Typically, the brewing weld thickness is about 1.5 mm per cycle, so if the corrosion thickness is 2.5 mm, at least two brewing welds are required under the same weld range.

Further, since the driving control unit is further provided with the horizontal moving unit 230, the arm unit 300 and the welding unit 400, which will be described later, can be remotely driven in the horizontal direction with the horizontal direction and the vertical direction.

In this specification, the horizontal direction means the width direction of the gap 30 (longitudinal direction in FIG. 4), and means that the thinning portion X formed in the vertical gap 31 or the horizontal gap 32 is to be repaired Which means the Z axis of the liner plate 22 when this device is installed (see Figs. 7, 8 and 9).

When the welding target portion extends along a curved surface along the liner plate 22, the welding portion 400 is closely contacted with the Z axis (the longitudinal direction in FIG. 4) .

In addition, the drive control unit 200 is further provided with a manual handle 240 so that the operator can manually drive the left and right movement, so that the operator can adjust the welding unit 400 in the lateral direction . That is, the operator attaches the apparatus to an appropriate position so as to cover the thinning region X, operates the manual handle 240 so that the welding region 400 is as close as possible to the thinning region X in the field, The operator can remotely control the drive control unit 200 to place the welding unit 400 at the thinning site X, thereby reducing the work time.

The motor control unit 200 includes a motor unit 250 including a motor and a driver so that the operator can remotely control the welding unit 400 using a joystick and a PC The welded portion 400 can be repeatedly welded in a predetermined region during the welding process.

The arm portion 300 is provided at one side of the driving control portion 200 and has a predetermined width to be inserted into the gap 30 where the thickened thinned exposed portion is located. Accordingly, it is possible to carry out a substantial upbringing repair work also on the exposed portion of the liner plate 22 located in the gap 30, which is difficult for an operator to access, by means of a concrete slab or the like.

The arm portion 300 is provided with a tube 510 so that a welding material is supplied along the longitudinal direction of the arm portion 300. The arm portion 300 is provided with a tube 510, The welding material supplied from the re-supply unit 500 can be transferred to the welding unit 400. [

Specifically, it is preferable that the welding material supplying unit 500 is provided in a disc shape so that the welding material can be coiled and reserved. The tube 510 may be spaced apart by the support leg 520 and may be provided in parallel with the arm portion 300. Accordingly, the welding material can be smoothly transported along the length of the arm part 300 by uncoiling the welding material in the welding material supplying part 500 in which the welding material is stored.

Meanwhile, the arm portion 300 may be configured to be replaceable depending on the shape of the gap 30 to be inserted. The interchangeable arm unit 300 includes a bracket 310 formed at one side of the driving control unit 200; And a replacement arm 320 having a coupling piece 315 formed to be detachably attached to an end of the bracket part 310. [

Specifically, the replacement arm 320 can be replaced with a linear shape, a refraction type, an arcuate shape, or the like corresponding to the shape of the gap 30 (see FIG. 10 for the refraction type replacement arm). This makes it possible to improve the accessibility of the arm portion 300 in accordance with the narrowness of the gap 30, the presence of an obstacle, the continuity of curved surfaces, and the like.

Further, the replacement arm is provided with the hole portion 311 along the longitudinal direction, so that it is possible to provide a passage through which electric wires can pass while reducing the material while having shearing rigidity with respect to the vertical direction (see FIG.

In addition, since the inclined portion 312 is provided at the corner of the replacement arm 320, wear and damage of the replacement arm 320 moving up and down and right and left in the gap 30 is minimized, (See FIG. 5).

FIG. 5 is an enlarged view of a welded portion 400 of the present invention, and FIG. 6 is a top view of the welded portion 400 of FIG.

The welding part 400 is provided at one end of the arm part 300 driven together by the drive control part 200 so that the exposed part of the gap 30 is raised and welded.

The welding portion 400 is provided with a welding work space 410 having a thickness smaller than the gap 30 so that the arm portion 300 including the welding portion 400 is inserted into the gap 30, The welding can be smoothly performed with respect to the region.

Specifically, the welding work space 410 is provided with a torch 420 for melting a welding material to be supplied, and a first observation for observing the molten state by the torch 420 while facing the torch 420 The camera 430 may be spaced apart from the torch 420. Accordingly, the operator can remotely monitor the welding operation intensively, thereby realizing the welding current in real time and correcting the position of the welding part 400 appropriately. The first observation camera is preferably a CCD camera.

Also, a second observation camera 440 is provided in the welding work space 410 opposite to the first observation camera 430, so that the operator can remotely observe the welding quality as a whole. In other words, through the second observation camera 440, the operator can control the welding quality in real time in addition to the monitoring of the pool by the first observation camera 430, such as the collision of the torch.

The second observation camera 440 is also preferably configured as a CCD camera. The second observation camera 440 is disposed at least two or more in the welding work space 410, The welding condition can be monitored remotely. In one embodiment, one of the second viewing cameras 440 may be attached to the arm portion 300 outside the welding work space 410 and directed toward the welding workspace 410 .

The tip of the tip 450 is provided on the opposite side of the torch in the welding work space and the tip 460 of the AVC shaft is spaced a predetermined distance from the torch 420, The welding can be repeatedly and continuously performed in the welding work space.

As described above, by applying the nuclear power CLP uplifting welding apparatus of the present invention, it is possible to repair the exposed portion of the liner plate 22 in the gap, which is difficult for an operator to approach, do.

Further, it is possible to realize the automation of the upsetting welding with respect to the thickness thinning zone X, so that the work efficiency can be improved, such as uniforming the welding quality while reducing work time and manpower.

 Ultimately, permanent repair of all corrosion defects corrosion defects in nuclear plant containment liner plates can be realized.

7 is a view showing a state in which a thinning portion generated in a vertical gap 31 is used for repairing a nuclear CLP up-welding apparatus 10 according to an embodiment of the present invention. FIG. 8 is a cross- (10) is used to move and repair other thinning sites.

Referring to this, the worker performs repair work by repairing any one thinning site (X) and then attaching it to another thinning site (X) physically spaced apart by removing the thinning site (X) (See Figs. 7 and 8). Specifically, the operator can attach the apparatus to an appropriate position so that the exposed thinning region X is included in the welding range by the left-right moving means 210 and the up-down moving means 220 (FIGS. 7 and 8 (See dotted line area of FIG. Then, the operator can remotely control the repetitive welding operation within the welding range remotely using a joystick, a PC, or the like, so that the automation of the upholstery maintenance work can be realized.

9 is a view showing a state in which a thinning portion occurring in the horizontal gap 32 according to an embodiment of the nuclear CLP welding apparatus 10 of the present invention is used for repairing a thinning portion.

The operator attaches the apparatus to one point of the liner plate 22 in order to repair the exposed thinning site X in the horizontal gap 32. The operator places the arm unit 300 upward, Can be performed. Likewise, the operator can attach the apparatus to an appropriate position so that the exposed thinning zone X is included in the welding range by the left and right moving means 210 and the up-and-down moving means 220 (see the dotted- ). Thus, by applying the apparatus, it is possible to perform maintenance work for all corrosion defects including the liner plate 22 located in the gap 30 of the containment.

10 is a view showing a state in which a thinning portion generated in a vertical gap 31 in which an obstacle 33 exists is used for repairing a thinning region according to another embodiment of the nuclear CLP planting welding apparatus 10 of the present invention.

In this way, the operator can replace the replacement arm 320 with a refraction type, an arcuate type, or the like in accordance with the shape of the gap, such as the presence or absence of an obstacle in the repair of the exposed thinning site X in the gap 30 (Fig. 10 shows an embodiment according to the refraction type replacement arm). Thus, even if there is an obstacle 33, such as a structure or a wiring, in the gap 30 or the gap type in the vertical gap 31 is curved by applying the present apparatus, maintenance for all the corrosion defects The work can be performed uniformly.

It should be understood that the present invention is not limited to the containment building N of the nuclear power plant and that the present invention can be used when the liner plate welding is required for the gap portion. For example, the present invention can be used to repair a corroded liner plate in a gap in an earthquake-resistant structure provided with a slab and wall vibration-proof gap to be applied on an earthquake-resistant design.

The present invention has been described above with respect to a nuclear CLP uplifting welding apparatus. It will be understood by those skilled in the art that the technical features of the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

It is to be understood, therefore, that the embodiments described above are in all respects illustrative and not restrictive.

100: base portion 110: electromagnet
200: drive control unit 210:
220: up / down moving means 230: horizontal moving means
240: manual handle 300: arm portion
310: bracket part 320: replacement arm
400: welding part 410: welding working space
420: torch 430: first observation camera
440: Second observation camera

Claims (18)

A welding apparatus for repairing a thinned portion by corrosion, comprising:
A base portion provided with an electromagnet;
A drive control unit provided to be supported by the base unit and driven by multiple axes remotely;
An arm portion provided at one side of the drive control portion and having a predetermined width so as to be inserted into a gap where a thickened exposed portion is located; And
And a welding portion provided at one end of the arm portion driven together by the drive control portion to cause the exposed portion that is thickened in the gap to be welded to be welded.
The method according to claim 1,
Wherein the drive control unit includes a left-right moving unit and a vertically moving unit.
3. The method of claim 2,
Wherein the drive control unit further comprises a horizontal moving unit.
3. The method of claim 2,
Wherein the drive control unit is further provided with a manual handle so that the worker can manually drive the workpiece in the left and right direction.
The method according to claim 1,
And a welding material supply unit is provided to continuously supply the welding material to the welding unit.
6. The method of claim 5,
Wherein the arm portion is provided with a tube so that a welding material is supplied along the longitudinal direction of the arm portion, and a welding material supplied from the welding material supplying portion is transferred to the welding portion.
The method according to claim 1,
Wherein the arm portion is configured to be replaceable according to a shape of a gap to be inserted.
8. The method of claim 7,
The arm portion
A bracket formed on one side of the drive control unit; And a replacement arm having a coupling piece detachably attached to an end of the bracket part.
The method according to claim 1,
Wherein the welding portion is provided with a welding work space having a thickness smaller than the gap so as to perform the growing welding on the exposed portion where the thickness is reduced in a state where the welding portion is inserted into the gap.
10. The method of claim 9,
Wherein the welding work space is provided with a torch for melting a welding material to be supplied and a first observation camera for observing a molten state of the torch toward the torch while being spaced apart from the torch. Breeding welding equipment.
11. The method of claim 10,
And a second observation camera is further provided on the opposite side of the first observation camera in the welding work space to observe the welding quality as a whole.
12. The method of claim 11,
Wherein at least two of the second observation cameras are disposed so as to face the inside of the welding work space.
13. The method of claim 12,
Wherein one of the second observation cameras is attached to the arm portion outside the welding work space and is disposed to face the welding work space.
11. The method of claim 10,
Wherein the welding work space is provided with a tip removing part on the opposite side of the torch.
The method according to claim 1,
And at least one or more electromagnets are provided on both sides of the base portion so as to be spaced apart from each other.
9. The method of claim 8,
Wherein the replacement arm is formed in a linear shape.
9. The method of claim 8,
Wherein the replacement arm is formed in a refracting type.
9. The method of claim 8,
Wherein the replacement arm is formed in an arc shape.

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