JP2014240087A - Gas shield welding device and gas shield welding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily place a work-piece in a shield vessel regardless of the weight and shape of the work-piece.SOLUTION: In a gas shield welding device 10, an inactive gas is supplied to a welding part of a work-piece 14 and welding is performed. The gas shield welding device 10 includes: a pedestal 16 on which the work-piece 14 is placed; and a shield vessel 12 in which multiple split members, each of which has a mating surface in a vertical direction, are assembled so as to sandwich the pedestal 16 and thereby shield the work-piece 14 placed on the pedestal 16 from air by using the inactive gas.

Description

  The present invention relates to a gas shield welding apparatus and a gas shield welding method.

For example, in order to repair damage to a workpiece such as a high-temperature component caused by the operation of a gas turbine, shielding is performed with an inert gas and welding is performed in a high-temperature environment using high-frequency induction heating or the like.
The gas shield welding apparatus described in Patent Document 1 is an example in which welding is performed while shielding with an inert gas. The gas shield welding apparatus described in Patent Document 1 contains a base material and a shield container having an open end, and is slidably disposed so as to cover the open end of the shield container, and a welding torch is inserted into the shield container And a lid member having an opening for the purpose.

JP 2003-019562 A

  Some workpieces such as high temperature parts are heavy and have large shapes. In order to arrange such a member to be processed in the shield container described in Patent Document 1, it is necessary to put the member to be processed from above the shield container, which requires time and labor. In addition, it takes time to fill the inside of the shield container with the inert gas and shield it with the inert gas after the workpiece is placed in the shield container.

  The present invention has been made in view of such circumstances, and a gas shield welding apparatus and a gas shield welding method capable of easily arranging a workpiece in a shield container regardless of the weight or shape of the workpiece. The purpose is to provide.

  In order to solve the above problems, the gas shield welding apparatus and the gas shield welding method of the present invention employ the following means.

  A gas shield welding apparatus according to a first aspect of the present invention is a gas shield welding apparatus in which an inert gas is supplied to a welded portion of a workpiece to perform welding, and the pedestal on which the workpiece is placed And a shield container that shields the work piece placed on the pedestal from the air by the inert gas by combining a plurality of divided members having mating surfaces in the vertical direction with the pedestal sandwiched therebetween. Prepare.

  In the gas shield welding apparatus according to this configuration, an inert gas is supplied to a welded portion of a workpiece placed on a pedestal and welding is performed. A shield container in which a plurality of divided members having mating surfaces in the vertical direction sandwich and combine the pedestal blocks the work piece placed on the pedestal from the air with an inert gas.

  Thereby, even if a to-be-processed object is a heavy article or a big shape, this structure can form a shield container by putting a work piece on a pedestal and sandwiching a pedestal and combining a plurality of division members. . For this reason, this configuration eliminates the need to place the workpiece in the shield container from the upper end of the shield container as in the prior art, so that the workpiece can be easily placed in the shield container regardless of the weight or shape of the workpiece. Can be placed.

  In the first aspect, it is preferable that the dividing member moves on a rail.

  According to this structure, since a division member can move easily, the combination of a several division member and the opening of a shield container can be performed easily.

  In the first aspect, it is preferable that an upper end of the shield container is open and disposed at the upper end of the shield container, and includes an opening and a partitionable shielding plate.

  In the gas shield welding apparatus according to this configuration, an operator welds a workpiece by inserting a welding torch into the inside from the upper end of the shield container. A shielding board is for shielding an operator from the heat at the time of welding. Since the shielding plate can be divided, the shielding plate can be moved together with the dividing member while being arranged at the upper end of the shielding container. Therefore, this configuration eliminates the need to perform the work of placing the shielding plate on the upper end of the shield container every time welding is performed, and thus the time required for welding preparation can be shortened.

  In the first aspect, it is preferable that the shielding plate includes a water-cooled pipe on a lower surface on the shield container side.

  This configuration can effectively cool the separable shielding plate with a simple configuration.

  In the first aspect, it is preferable that a volume reduction unit that reduces the volume in the shield container to be filled with the inert gas is provided.

  This configuration can reduce the amount of inert gas supplied into the shield container and shorten the time required for preparation before welding.

  A gas shield welding apparatus according to a second aspect of the present invention is a gas shield welding apparatus in which an inert gas is supplied to a welded portion of a workpiece and welding is performed, the inert gas being supplied, and the workpiece A shield container that shields a workpiece from the air with the inert gas; and a volume reduction unit that reduces a volume in the shield container to be filled with the inert gas.

  A gas shield welding method according to a third aspect of the present invention is a gas shield welding method for performing welding by supplying an inert gas to a welded portion of a workpiece, and placing the workpiece on a pedestal, A shield container is formed by combining a plurality of divided members having mating surfaces in the vertical direction with the pedestal sandwiched therebetween, and an inert gas is supplied to the shield container to place the workpiece placed on the pedestal. Weld.

  According to the present invention, there is an excellent effect that the workpiece can be easily arranged in the shield container regardless of the weight and shape of the workpiece.

It is a lineblock diagram of the shield container concerning a 1st embodiment of the present invention, (a) is a bird's-eye view of the state where the shield container was released, and (b) is a top view of the state where the shield container was released. It is a lineblock diagram of the shield container concerning a 1st embodiment of the present invention, (a) is a side view in the state where a shield container was released, and (b) is a side view in the state where a shield container was formed. It is the block diagram which showed the pipe which supplies the inert gas provided for every division member which concerns on 1st Embodiment of this invention, (a) is a bird's-eye view, (b) is a top view. It is a block diagram which shows arrangement | positioning of the high frequency coil which concerns on 1st Embodiment of this invention. It is a block diagram which shows the other example of arrangement | positioning of the high frequency coil which concerns on 1st Embodiment of this invention. It is a block diagram of the shielding container provided with the shielding board which concerns on 2nd Embodiment of this invention, (a) is a bird's-eye view, (b) is a top view. It is a block diagram which shows the shielding board provided with the notch which concerns on 2nd Embodiment of this invention. It is a side view which shows the arrangement position of the water cooling pipe of the shielding board which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the example which made the volume reduction part which concerns on 3rd Embodiment of this invention the hydraulic jack. It is a block diagram which shows the example which used the volume reduction part which concerns on 3rd Embodiment of this invention as the partition plate. It is a block diagram which shows the example which used the volume reduction part which concerns on 3rd Embodiment of this invention as a partition plate, (a) is an example provided with the groove | channel by which a partition plate is engage | inserted to the internal peripheral surface of a shield container, (B), (c) is the example by which the projection part which supports a partition plate was provided in the internal peripheral surface of the shield container. It is a block diagram which shows the example which used the volume reduction part which concerns on 3rd Embodiment of this invention as the three-dimensional structure. It is a block diagram which shows the example of the three-dimensional structure which concerns on 3rd Embodiment of this invention.

  Hereinafter, an embodiment of a gas shield welding apparatus and a gas shield welding method according to the present invention will be described with reference to the drawings.

[First Embodiment]
The first embodiment of the present invention will be described below.

The gas shield welding apparatus according to the first embodiment performs welding by supplying an inert gas to a welded portion of a workpiece in order to prevent oxidation due to welding. For this reason, the worker arranges the workpiece in the shield container and supplies the inert gas into the shield container so that the workpiece is cut off from the air while the welding torch is inserted from the upper end of the shield container. And weld the workpiece.
The workpiece is, for example, a gas turbine blade. The inert gas is, for example, argon gas.

  1 and 2 are configuration diagrams of the shield container 12 of the gas shield welding apparatus 10 according to the first embodiment. FIG. 1A is a bird's-eye view showing a state in which the shield container 12 is opened, and FIG. Is a top view. Moreover, Fig.2 (a) is a side view of the state in which the shield container 12 was open | released, and FIG.2 (b) is a side view of the state in which the shield container 12 was formed.

The gas shield welding apparatus 10 includes a pedestal 16 on which a workpiece 14 is placed.
The shield container 12 is formed by combining divided members 12A and 12B having a mating surface in the vertical direction with the pedestal 16 sandwiched therebetween, and the workpiece 14 placed on the pedestal 16 is shielded from air by an inert gas. .

A packing 18 made of, for example, rubber or silicon is provided on the mating surfaces of the divided members 12A and 12B. A packing 20 is also provided in the circumferential direction of the base 16. The packing 18 abuts on the inner peripheral surface of the shield container 12.
The packings 18 and 20 may be made of a material other than rubber or silicon as long as it has sufficient heat resistance.
When the divided members 12A and 12B are combined with the pedestal 16 sandwiched therebetween, the packings 18 and 20 prevent the inert gas from leaking from the mating surfaces.

  As shown in FIG. 2B, the divided members 12 </ b> A and 12 </ b> B are fixed by winding the band 22 around the outer peripheral surface and fastening the band 22 with the buckle 24. In addition, the fixing method of division member 12A, 12B is not restricted to this, Another method may be sufficient.

  In such a gas shield welding apparatus 10, even if the workpiece 14 is heavy or large in shape, after the workpiece 14 is placed on the pedestal 16, the pedestal 16 is sandwiched between the divided members 12 </ b> A and 12 </ b> B. By combining these, the shield container 12 can be formed. Therefore, the gas shield welding apparatus 10 does not need to place the workpiece 14 from above the shield container 12 as in the prior art, so that the workpiece 14 is placed in the shield container 12 regardless of the weight or shape of the workpiece 14. The workpiece 14 can be easily arranged.

  The divided members 12A and 12B move on the rail 26. Since the shield container 12 is formed by the two divided members 12 </ b> A and 12 </ b> B, the operator can easily move the shield container 12 by one rail 26. For this reason, the wheel 28 which rolls on the rail 26 is provided in the lower surface of division member 12A, 12B. In the example of FIG. 1, the divided members 12A and 12B are each provided with two wheels 28, but the number of wheels 28 is not limited to this.

  After placing the workpiece 14 on the pedestal 16, the worker moves the split members 12 </ b> A and 12 </ b> B on the rail 26, thereby forming the shield container 12 by combining the split members 12 </ b> A and 12 </ b> B.

  Thereafter, as shown in FIG. 3, the inert gas is supplied to the pipe 30 provided for each of the divided members 12 </ b> A and 12 </ b> B, and the inert gas is released into the shield container 12 from the hole opened in the pipe 30. The inside of the shield container 12 is filled with an inert gas so that welding is possible. In addition, the pipe 30 may be provided in other positions, such as the center or the lower part of an internal peripheral surface, without providing above the internal peripheral surface of division member 12A, 12B, as FIG. 3 shows.

  Then, the operator inserts a welding torch into the inside from the open upper end of the shield container 12 to weld the workpiece 14.

Here, welding may be performed by heating the workpiece 14. In such a case, a high-frequency coil 32 for heating the workpiece 14 is inserted into the shield container 12 as shown in FIG. The high frequency coil 32 is connected to a matching transformer 34 that allows high frequency to flow. In the example of FIG. 3, the power transmission path 36 of the high-frequency coil 32 is bent into an L shape so as not to interfere with the shield container 12 and is inserted from above the shield container 12.
The matching transformer 34 is placed on a transformer installation table (not shown) that can move up and down. Thereby, the high frequency coil 32 can be moved up and down in accordance with the welding location of the workpiece 14.

FIG. 5 is a configuration diagram illustrating another example of the arrangement of the high-frequency coils 32.
As shown in FIG. 5, the high-frequency coil 32 and the matching transformer 34 are arranged horizontally. The dividing members 12A and 12B are provided with notches 12C so that the high-frequency coil 32 can move up and down together with the matching transformer 34. In the example of FIG. 5, the notch 12C is provided on the mating surface of the divided members 12A and 12B. 12C may be provided.

  When the welding to the workpiece 14 is completed, the operator stops the supply of the inert gas, and then moves the dividing members 12A and 12B on the rail 26 to release the shield container 12, and the workpiece 14 Take out.

  As described above, the divided members 12A and 12B according to the first embodiment can be easily moved in order to move on the rail 26, and the operator can sandwich the pedestal 16 and combine the divided members 12A and 12B. And the shield container 12 can be easily opened.

  As described above, in the gas shield welding apparatus 10 according to the first embodiment, the inert gas is supplied to the welded portion of the workpiece 14 and welding is performed. The gas shield welding apparatus 10 is combined with the pedestal 16 by combining the pedestal 16 on which the workpiece 14 is placed and a plurality of divided members 12A and 12B having a mating surface in the vertical direction with the pedestal 16 interposed therebetween. And a shield container 12 that shields the mounted workpiece 14 from the air with an inert gas.

  Therefore, the gas shield welding apparatus 10 according to the first embodiment can easily arrange the workpiece 14 in the shield container 12 regardless of the weight or shape of the workpiece 14.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described.

  FIG. 6 shows a configuration of the gas shield welding apparatus 10 according to the second embodiment. In FIG. 6, the same components as those in FIG. 1 are denoted by the same reference numerals as those in FIG.

6A and 6B are configuration diagrams of the shield container 12 including the shielding plate 50, where FIG. 6A is a bird's eye view and FIG. 6B is a top view.
The shielding plate 50 is disposed at the upper end of the shielding container 12, has an opening 50C, and can be divided into shielding plates 50A and 50B. The shielding plate 50 is for shielding the worker from heat during welding, and the worker inserts the welding torch into the shield container 12 through the opening 50C.

  Thus, since the shielding plate 50 can be divided, the shielding plate 50 can be moved together with the divided members 12A and 12B while being arranged at the upper end of the shield container 12. Therefore, in the gas shield welding apparatus 10 according to the second embodiment, it is not necessary to perform the work of disposing the shielding plate 50 on the upper end of the shield container 12 every time welding is performed, so that the time required for welding preparation can be shortened.

  Further, as shown in FIG. 7, the shielding plate 50 may be provided with a notch 50 </ b> D for inserting the high-frequency coil 32 into the shielding container 12.

In addition, the temperature of the shielding plate 50 during the welding operation may reach a high temperature (several hundred degrees) depending on the operation conditions. When the shielding plate 50 reaches such a high temperature, workability becomes very poor.
Therefore, as shown in FIG. 8, the shielding plate 50 includes a water cooling pipe 52 on the lower surface on the shielding container 12 side. Thereby, the separable shielding plate 50 is effectively cooled with a simple configuration, and the workability of the operator is improved.

  Although it is conceivable to provide the water-cooled pipe 52 inside the shielding plate 50, in this case, the shielding plate 50 needs to be thick and the weight of the shielding plate 50 becomes heavy. Further, the shielding plate 50 may be moved frequently and may be damaged. When the water-cooled pipe 52 is provided inside the shielding plate 50, if the water-cooled pipe 52 is damaged, labor is required to repair it. However, when the water-cooled pipe 52 is provided on the lower surface of the shielding plate 50, maintenance such as repair of the water-cooled pipe 52 is good.

Further, since the shielding plate 50 can be divided, each of the divided shielding plates 50 has an inlet and an outlet for cooling water to the water cooling pipe 52.
Further, the water cooling pipe 52 may be provided on the inner peripheral surface and the outer peripheral surface of the shield container 12.

[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described.
The volume of the shield container 12 is generally sufficiently larger than the volume of the workpiece 14. Therefore, when the volume of the workpiece 14 is small, more inert gas must be supplied into the shield container 12 than necessary, and it may take time for preparation before welding.

Therefore, the gas shield welding apparatus 10 according to the third embodiment reduces the amount of inert gas supplied into the shield container 12 and reduces the time required for preparation before welding. A volume reduction unit for reducing the volume in the shield container 12 to be filled with the active gas is provided.
In the shield container 12 according to the third embodiment, as shown in FIG. 3, the inert gas is released into the shield container 12 from the top to the bottom of the shield container 12.

  9 to 13 are examples of the volume reducing unit according to the third embodiment.

  The volume reducing portion shown in FIG. 9 is a hydraulic jack 60 installed on the pedestal 16 and a partition portion 62 that also serves as a jig for the workpiece 14.

  The hydraulic jack 60 moves the partition portion 62 on which the workpiece 14 is placed in the vertical direction with hydraulic oil. The partition part 62 is provided with a packing 64 around it. The packing 64 abuts against the inner peripheral surface of the shield container 12 and prevents the inert gas from leaking between the partition 62 and the shield container 12.

The hydraulic jack 60 is moved up and down according to the size of the workpiece 14, so that the volume in the shield container 12 to be filled with the inert gas can be adjusted. That is, when the workpiece 14 is small, the volume in the shield container 12 can be reduced by raising the hydraulic jack 60.
In addition, after adjusting the hydraulic jack 60 to a desired height, the split members 12A and 12B are combined with the pedestal 16 interposed therebetween.

  The volume reducing part shown in FIG. 10 is a partition plate 70 installed in the shield container 12. The partition plate 70 is formed by combining a plurality of partition plates 12A and 12B in the same manner as the split members 12A and 12B. The partition plate 70 is determined such that a portion that requires welding is positioned above the partition plate 70 and a portion that does not require welding is positioned below the partition plate 70. An opening 70A (see FIG. 11) is formed in the partition plate 70, and the opening 70A has a shape corresponding to the shape of the workpiece 14 on which the partition plate 70 is positioned.

  A packing 72 is provided between the peripheral surface of the opening 70A and the workpiece 14 in order to prevent the inert gas from leaking from the gap. The packing 72 is preferably made of, for example, silicon having high heat resistance because it is close to the welded portion.

  By partitioning the inside of the shield container 12 by the partition plate 70, the volume in the shield container 12 to be filled with the inert gas is higher than the partition plate 70. Therefore, the partition plate 70 can reduce the volume in the shield container 12 to be filled with the inert gas.

FIG. 11A is an example in which a groove 74 for fitting the partition plate 70 is provided on the inner peripheral surface of the shield container 12.
11 (b) and 11 (c) are examples in which protrusions 76A and 76B for supporting the partition plate 70 are provided on the inner peripheral surface of the shield container 12, and FIG. FIG. 11C shows an example in which a discontinuous protrusion 76 </ b> B is provided on the inner peripheral surface of the shield container 12.

  In the example of FIG. 11, only one groove 74 and protrusions 76 </ b> A and 76 </ b> B are provided. The height of the partition plate 70 may be easily changed according to the height of the welded portion of the workpiece 14.

The volume reducing portion shown in FIG. 12 is a three-dimensional structure 80.
The three-dimensional structure 80 is formed so as to reduce the volume in the shield container 12 to be filled with an inert gas in accordance with the shape of the workpiece 14. Note that a space having sufficient workability is provided between the workpiece 14 and the three-dimensional structure 80.
More specifically, for example, as shown in FIG. 13, a plurality of plate members 82 are formed in combination. The plate material 82 is made of a material having a high heat-shielding property so that an inert gas does not flow between the plate material 82 and the plate material 82. Alternatively, a three-dimensional structure 80 may be obtained by bonding non-combustible cloth that does not allow inert gas to pass through the framework.

  Further, for example, a hook is provided on the inner peripheral surface of the shield container 12, and a three-dimensional structure 80 is hung on a hook (not shown) provided on the shield container 12, so that a three-dimensional structure is formed on the inner peripheral surface of the shield container 12. The structure 80 is fixed.

  In particular, since the shield container 12 can form the shield container 12 by combining the divided members 12A and 12B after the three-dimensional structure 80 is fixed to the divided members 12A and 12B, the three-dimensional structure 80 is attached to the shield container 12. Fixing workability is good.

  As mentioned above, although this invention was demonstrated using said each embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. Various changes or improvements can be added to the above-described embodiments without departing from the gist of the invention, and embodiments to which the changes or improvements are added are also included in the technical scope of the present invention.

  For example, in each of the above-described embodiments, the shield container 12 has been described as having two divided members 12A and 12B. However, the present invention is not limited to this, and there are three or more shield containers 12. It is good also as a form comprised by these division members.

  Moreover, although each said embodiment demonstrated the form by which the shield container 12 was made into a cylindrical shape, this invention is not limited to this, The shield container 12 is good also as other shapes, such as a square.

DESCRIPTION OF SYMBOLS 10 Gas shield welding apparatus 12 Shield container 12A Dividing member 12B Dividing member 14 Work piece 16 Base 50 Shielding plate 52 Water cooling pipe 60 Hydraulic jack 62 Partition part 70 Partition plate 80 Three-dimensional structure

Claims (7)

A gas shield welding apparatus in which an inert gas is supplied to a welded portion of a workpiece and welding is performed,
A pedestal on which the workpiece is placed;
A shield container that blocks the workpiece placed on the pedestal from the air by the inert gas by combining a plurality of divided members having a mating surface in the vertical direction with the pedestal sandwiched therebetween, and
A gas shield welding apparatus comprising:   The gas shield welding apparatus according to claim 1, wherein the split member moves on a rail. The shield container has an open upper end,
The gas shield welding apparatus according to claim 1, further comprising a shield plate that is disposed at an upper end of the shield container and has an opening and can be divided.   The gas shield welding apparatus according to claim 3, wherein the shielding plate includes a water cooling pipe on a lower surface on the shield container side.   The gas shield welding apparatus according to any one of claims 1 to 4, further comprising a volume reducing unit that reduces a volume in the shield container to be filled with the inert gas. A gas shield welding apparatus in which an inert gas is supplied to a welded portion of a workpiece and welding is performed,
A shield container that is supplied with the inert gas and that shields the workpiece from the air with the inert gas;
A volume reduction section for reducing the volume in the shield container to be filled with the inert gas;
A gas shield welding apparatus comprising: A gas shield welding method for performing welding by supplying an inert gas to a welded portion of a workpiece,
Place the workpiece on the pedestal,
A shield container is formed by combining a plurality of divided members having mating surfaces in the vertical direction with the pedestal sandwiched therebetween,
A gas shield welding method in which an inert gas is supplied to the shield container and the workpiece placed on the pedestal is welded.

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