GIS shell welding tool and welding method

Abstract

The invention relates to the field of welding, in particular to a GIS shell welding tool and a welding method.The GIS shell welding tool comprises a base, a connecting base, a supporting column, a first positioning rod, a second positioning rod, a third positioning rod, a fourth positioning rod, a first positioning cover, a second positioning cover, a third positioning cover and a fourth positioning cover; the supporting column is arranged at the top of the connecting base, and the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod are detachably arranged on the peripheral face of the supporting column. The first positioning cover, the second positioning cover, the third positioning cover and the fourth positioning cover are detachably connected with the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod respectively. According to the invention, good positioning of the branch pipe and the mounting hole during welding of the GIS shell can be realized, and the use safety of the GIS shell is ensured.

Description

Technical Field

[0001] The present invention relates to the field of welding, and in particular to a GIS shell welding tool and a welding method. Background Art

[0002] GIS equipment, also known as gas-insulated switchgear, is a key device in power transmission and transformation systems. It is mainly used in high-voltage and ultra-high-voltage power systems (such as 110kV and above). It achieves compactness and high reliability by sealing electrical components such as circuit breakers, disconnectors, earthing switches, busbars, and transformers in a metal casing filled with sulfur hexafluoride gas.

[0003] As an important component, the housing is directly related to the performance and safety of GIS equipment. Figure 8 and Figure 10 The GIS shell includes a main shell 22, a first branch pipe 17 with a first flange 171, a second branch pipe 18 with a second flange 181, a third branch pipe 19 with a third flange 191, and a fourth branch pipe 20. The bottom of the main shell 22 is provided with a connecting flange 225. The outer circumferential surface of the main shell 22 has a first mounting hole 221, a second mounting hole 222, a third mounting hole 223 and a fourth mounting hole 224. The first branch pipe 17, the second branch pipe 18, the third branch pipe 19 and the fourth branch pipe 20 are welded to the first mounting hole 221, the second mounting hole 222, the third mounting hole 223 and the fourth mounting hole 224, respectively. In the prior art, there is no dedicated tooling for welding the first branch pipe 17, the second branch pipe 18, the third branch pipe 19, and the fourth branch pipe 20 to the main casing 22. Therefore, when the first branch pipe 17, the second branch pipe 18, the third branch pipe 19, and the fourth branch pipe 20 are welded in sequence, they are usually transported to the corresponding positions of the main casing 22 by hoisting equipment for welding while being hoisted. However, the hoisting equipment cannot ensure that the branch pipes can be well positioned during welding. If the branch pipes cannot be well positioned during welding, the safety of the GIS equipment will be affected. Summary of the Invention

[0004] The present invention provides a GIS shell welding tool and a welding method, the main purpose of which is to overcome the problem that the existing GIS shell has no special tool during welding, resulting in the branch pipe being unable to be well positioned during welding.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: A GIS shell welding tool comprises a base, a connecting base, a support column, a first positioning rod, a second positioning rod, a third positioning rod, a fourth positioning rod, a first positioning cover, a second positioning cover, a third positioning cover and a fourth positioning cover. The connecting base is arranged on the top of the base, the support column is arranged on the top of the connecting base, the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod are detachably arranged on the outer circumference of the support column, and the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod can be respectively located in the first branch pipe, the second branch pipe, the third branch pipe and the fourth branch pipe after being connected to the support column. The first positioning cover, the second positioning cover, the third positioning cover and the fourth positioning cover are detachably connected to the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod respectively; a portion of the first positioning cover, the second positioning cover and the third positioning cover are respectively adapted to the inner diameters of the first flange, the second flange and the third flange; another portion of the first positioning cover, the second positioning cover and the third positioning cover can respectively press the end faces of the first flange, the second flange and the third flange; a portion of the fourth positioning cover is adapted to the inner diameter of the fourth branch pipe, and another portion of the fourth positioning cover can press the end face of the fourth branch pipe.

[0006] Furthermore, the connecting seat and the base are locked and connected by bolts.

[0007] Furthermore, the support column is detachably connected to the connecting seat and the base.

[0008] Furthermore, the outer peripheral surface of the support column is provided with a first threaded hole, a second threaded hole, a third threaded hole and a fourth threaded hole, and the ends of the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod close to the support column are threadedly connected to the first threaded hole, the second threaded hole, the third threaded hole and the fourth threaded hole respectively.

[0009] Furthermore, the first positioning cover, the second positioning cover, the third positioning cover and the fourth positioning cover all include positioning parts and pressure plates connected to each other, the positioning parts of the first positioning cover, the second positioning cover and the third positioning cover are respectively adapted to the inner diameters of the first flange, the second flange and the third flange, and are respectively located in the first flange, the second flange and the third flange, the pressure plates of the first positioning cover, the second positioning cover and the third positioning cover can press the end faces of the first flange, the second flange and the third flange respectively, the positioning part of the fourth positioning cover is adapted to the inner diameter of the fourth branch pipe and is located in the fourth branch pipe, the pressure plate of the fourth positioning cover can press The end face of the fourth branch pipe, the middle parts of the first positioning cover, the second positioning cover, the third positioning cover and the fourth positioning cover are all provided with locking holes along the length direction, the ends of the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod away from the support column are all provided with fifth threaded holes, the ends of the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod away from the support column are respectively located in the corresponding locking holes, and the first positioning cover, the second positioning cover, the third positioning cover and the fourth positioning cover are respectively locked and connected with the fifth threaded holes of the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod by bolts.

[0010] Furthermore, the connecting seat is provided with a sixth threaded hole running through from top to bottom, the top of the base is provided with a seventh threaded hole running through from top to bottom, and the bottom surface of the support column is provided with a threaded section, which is threadedly connected to the sixth threaded hole and the seventh threaded hole.

[0011] A GIS shell welding method, using the GIS shell welding tool, includes the following steps: S1. First, lock the main shell of the GIS shell on the connecting seat, then connect the first positioning rod, the second positioning rod, the third positioning rod, and the fourth positioning rod to the support column and place them in the first mounting hole, the second mounting hole, the third mounting hole, and the fourth mounting hole respectively; S2. Send the first branch pipe to the first mounting hole and position the first positioning rod in the first mounting hole. Then, position the positioning portion of the first positioning cover in the first flange and clamp the first flange. Then, connect the first positioning cover to the first positioning rod. After the first positioning cover is connected to the first positioning rod, allow the pressure plate of the first positioning cover to press the end face of the first flange. At this time, the first branch pipe and the first mounting hole are positioned. Then, pre-weld the first branch pipe to the first mounting hole to fix it. Finally, fully weld the first branch pipe to the first mounting hole. S3. Send the second branch pipe to the second mounting hole and position the second positioning rod in the second mounting hole. Then, position the positioning portion of the second positioning cover in the second flange and clamp the second flange. Then, connect the second positioning cover to the second positioning rod. After the second positioning cover is connected to the second positioning rod, allow the pressure plate of the second positioning cover to press the end surface of the second flange. At this time, the second branch pipe can be positioned with the second mounting hole. Then, pre-weld the second branch pipe to the second mounting hole to fix it. Finally, fully weld the second branch pipe to the second mounting hole. S4. Send the third branch pipe to the third mounting hole and position the third positioning rod in the third mounting hole. Then, position the positioning portion of the third positioning cover in the third flange and clamp the third flange. Then, connect the third positioning cover to the third positioning rod. After the third positioning cover and the third positioning rod are connected, allow the pressure plate of the third positioning cover to press the end surface of the third flange. At this time, the third branch pipe and the third mounting hole are positioned. Then, pre-weld the third branch pipe to the third mounting hole to fix it. Finally, fully weld the third branch pipe to the third mounting hole. S5. Send the fourth branch pipe to the fourth mounting hole, and let the fourth positioning rod be located in the fourth mounting hole. Then, place the positioning portion of the fourth positioning cover in the fourth branch pipe and clamp the fourth branch pipe. Then, connect the fourth positioning cover to the fourth positioning rod. After the fourth positioning cover is connected to the fourth positioning rod, let the pressure plate of the fourth positioning cover press the end face of the fourth branch pipe. At this time, the fourth branch pipe and the fourth mounting hole can be positioned. Then, pre-weld the fourth branch pipe to the fourth mounting hole for fixation. Finally, fully weld the fourth branch pipe to the fourth mounting hole.

[0012] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages: When the GIS shell is to be welded, the main shell of the GIS shell is first locked to the connecting seat. Then, the first, second, third, and fourth positioning rods are connected to the support column and positioned in the first, second, third, and fourth mounting holes, respectively. The first, second, third, and fourth branch pipes are then welded to the corresponding first, second, third, and fourth mounting holes, respectively. Beginning with the welding of the first branch pipe, the first branch pipe is first brought to the first mounting hole, with the first positioning rod positioned in the first mounting hole. A portion of the first positioning cover is then positioned in the first flange, and the first positioning cover is then connected to the first positioning rod. After the first positioning cover is connected to the first positioning rod, the other portion of the first positioning cover presses against the end face of the first flange, thereby positioning the first branch pipe in the first mounting hole. The first branch pipe is then pre-welded to the first mounting hole to secure it, and finally, the first branch pipe is fully welded to the first mounting hole. According to the above method, the second branch pipe, the third branch pipe, and the fourth branch pipe can be welded to the second mounting hole, the third mounting hole, and the fourth mounting hole, respectively. The present invention can achieve good positioning of the branch pipes and the mounting holes when welding the GIS shell, ensuring the safety of the GIS shell during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the present invention.

[0014] Figure 2 It is a structural decomposition diagram of the present invention.

[0015] Figure 3 for Figure 2 Exploded view of the structure from another angle.

[0016] Figure 4 It is a structural schematic diagram of the first positioning cover of the present invention.

[0017] Figure 5 It is a structural schematic diagram of the second positioning cover of the present invention.

[0018] Figure 6 This is a schematic structural diagram of the third positioning cover of the present invention.

[0019] Figure 7 It is a structural schematic diagram of the fourth positioning cover of the present invention.

[0020] Figure 8 This is a structural diagram of the GIS shell located on the welding tooling.

[0021] Figure 9 for Figure 8 A structural diagram from another angle.

[0022] Figure 10This is the structural diagram of the main shell of the GIS shell. DETAILED DESCRIPTION

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0024] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified with "first," "second," etc., may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0025] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0026] Reference Figure 1 、 Figures 4 to 9A GIS shell welding tool comprises a base 1, a connecting base 2, a support column 3, a first positioning rod 4, a second positioning rod 5, a third positioning rod 6, a fourth positioning rod 7, a first positioning cover 8, a second positioning cover 9, a third positioning cover 10 and a fourth positioning cover 11. The connecting base 2 is arranged at the top of the base 1, and the support column 3 is arranged at the top of the connecting base 2. The first positioning rod 4, the second positioning rod 5, the third positioning rod 6 and the fourth positioning rod 7 are detachably arranged on the outer circumference of the support column 3. After the first positioning rod 4, the second positioning rod 5, the third positioning rod 6 and the fourth positioning rod 7 are connected to the support column 3, they can be respectively located in the first branch pipe 17, the second branch pipe 18, the third branch pipe 19 and the fourth branch pipe 20. The first positioning cover 8, the second positioning cover 9, the third positioning cover 10 and the fourth positioning cover 11 are respectively detachably connected to the first positioning rod 4, the second positioning rod 5, the third positioning rod 6 and the fourth positioning rod 7. A portion of the first positioning cover 8, the second positioning cover 9 and the third positioning cover 10 are respectively adapted to the inner diameters of the first flange 171, the second flange 181 and the third flange 191, and another portion of the first positioning cover 8, the second positioning cover 9 and the third positioning cover 10 can respectively press the end faces of the first flange 171, the second flange 181 and the third flange 181, and a portion of the fourth positioning cover 11 is adapted to the inner diameter of the fourth branch pipe 20, and another portion of the fourth positioning cover 11 can press the end face of the fourth branch pipe 20.

[0027] Reference Figure 1 、 Figure 2 and Figure 8 In this embodiment, the connecting base 2 and the base 1 are locked and connected by bolts. Specifically, the connecting flange 225 at the bottom of the main housing 22 is fixedly connected to the connecting base 2 by multiple bolts. These multiple bolts pass through the connecting base 2 and the base 1 and are threadedly connected to the connecting base 2 and the base 1. The base 1 is connected to the machine. The support column 3 is detachably connected to the connecting base 2 and the base 1. Specifically, the connecting base 2 is provided with a sixth threaded hole 21 extending vertically therethrough. The top of the base 1 is provided with a seventh threaded hole 12 extending vertically therethrough. The bottom surface of the support column 3 is provided with a threaded section 31, which is threadedly connected to the sixth threaded hole 21 and the seventh threaded hole 12.

[0028] Reference Figures 1 to 3The outer circumferential surface of the support column 3 is provided with a first threaded hole 32, a second threaded hole 33, a third threaded hole 34, and a fourth threaded hole 35. The ends of the first positioning rod 4, the second positioning rod 5, the third positioning rod 6, and the fourth positioning rod 7 near the support column 3 are threadedly connected to the first threaded hole 32, the second threaded hole 33, the third threaded hole 34, and the fourth threaded hole 35, respectively. Specifically, the ends of the first positioning rod 4, the second positioning rod 5, the third positioning rod 6, and the fourth positioning rod 7 near the support column 3 are respectively provided with a first external thread, a second external thread, a third external thread, and a fourth external thread. The ends of the first positioning rod 4, the second positioning rod 5, the third positioning rod 6, and the fourth positioning rod 7 near the support column 3 are detachably connected to the support column 3 by threaded connection.

[0029] Reference Figure 1 、 Figures 4 to 9 The first positioning cover 8, the second positioning cover 9, the third positioning cover 10 and the fourth positioning cover 11 all include a positioning portion 13 and a pressure plate 14 that are connected to each other. The positioning portions 13 of the first positioning cover 8, the second positioning cover 9 and the third positioning cover 10 are respectively adapted to the inner diameters of the first flange 171, the second flange 181 and the third flange 191, and can be respectively located within the first flange 171, the second flange 181 and the third flange 191. The pressure plates 14 of the first positioning cover 8, the second positioning cover 9 and the third positioning cover 10 can respectively press the end faces of the first flange 171, the second flange 181 and the third flange 191. The positioning portion 13 of the fourth positioning cover 11 is adapted to the inner diameter of the fourth branch pipe 20 and is located within the fourth branch pipe 20. The pressure plate 14 of the fourth positioning cover 11 can press the end face of the fourth branch pipe 20. The middle portions of the first positioning cover 8, the second positioning cover 9, the third positioning cover 10 and the fourth positioning cover 11 are provided with locking holes 15 along the length direction, and the ends of the first positioning rod 4, the second positioning rod 5, the third positioning rod 6 and the fourth positioning rod 7 away from the support column 3 are provided with fifth threaded holes 16. The ends of the first positioning rod 4, the second positioning rod 5, the third positioning rod 6 and the fourth positioning rod 7 away from the support column 3 are respectively located in the corresponding locking holes 15. The first positioning cover 8, the second positioning cover 9, the third positioning cover 10 and the fourth positioning cover 11 are respectively locked and connected with the fifth threaded holes 16 of the first positioning rod 4, the second positioning rod 5, the third positioning rod 6 and the fourth positioning rod 7 by bolts. Specifically, when the first positioning cover 8, the second positioning cover 9, the third positioning cover 10 and the fourth positioning cover 11 are respectively connected with the first positioning rod 4, the second positioning rod 5, the third positioning rod 6 and the fourth positioning rod 7, bolts are respectively inserted into the locking holes 15 of the first positioning cover 8, the second positioning cover 9, the third positioning cover 10 and the fourth positioning cover 11 and threadedly connected with the corresponding fifth threaded holes 16.

[0030] Reference Figures 1 to 10The present invention also discloses a GIS shell welding method, which uses the GIS shell welding tool, including the following steps: S1. First, lock the main shell 22 of the GIS shell onto the connecting base 2. Then, connect the first positioning rod 4, the second positioning rod 5, the third positioning rod 6, and the fourth positioning rod 7 to the support column 3 and position them in the first mounting hole 221, the second mounting hole 222, the third mounting hole 223, and the fourth mounting hole 224, respectively. S2. Send the first branch pipe 17 to the first mounting hole 221, and let the first positioning rod 4 be located in the first mounting hole 221. Then, the positioning portion 13 of the first positioning cover 8 is located in the first flange 171 and clamps the first flange 171. Then, the first positioning cover 8 is connected to the first positioning rod 4. After the first positioning cover 8 is connected to the first positioning rod 4, the pressure plate 14 of the first positioning cover 8 presses the end surface of the first flange 171. At this time, the first branch pipe 17 and the first mounting hole 221 can be positioned. Then, the first branch pipe 17 is pre-welded to the first mounting hole 221 for fixation. Finally, the first branch pipe 17 is fully welded to the first mounting hole 221. S3. Send the second branch pipe 18 to the second mounting hole 222, and let the second positioning rod 5 be located in the second mounting hole 222. Then, the positioning portion 13 of the second positioning cover 9 is located in the second flange 181 and clamps the second flange 181. Then, the second positioning cover 9 is connected to the second positioning rod 5. After the second positioning cover 9 is connected to the second positioning rod 5, the pressure plate 14 of the second positioning cover 9 presses the end surface of the second flange 181. At this time, the second branch pipe 18 can be positioned with the second mounting hole 222. Then, the second branch pipe 18 is pre-welded to the second mounting hole 222 for fixation. Finally, the second branch pipe 18 is fully welded to the second mounting hole 222. S4. Send the third branch pipe 19 to the third mounting hole 223, and let the third positioning rod 6 be located in the third mounting hole 223. Then, the positioning portion 13 of the third positioning cover 10 is located in the third flange 191 and clamps the third flange 191. Then, the third positioning cover 10 is connected to the third positioning rod 6. After the third positioning cover 10 is connected to the third positioning rod 6, the pressure plate 14 of the third positioning cover 10 presses the end surface of the third flange 191. At this time, the third branch pipe 19 and the third mounting hole 223 can be positioned. Then, the third branch pipe 19 is pre-welded to the third mounting hole 223 for fixation. Finally, the third branch pipe 19 is fully welded to the third mounting hole 223. S5. Send the fourth branch pipe 20 to the fourth mounting hole 224, and let the fourth positioning rod 7 be located in the fourth mounting hole 224. Then, the positioning portion 13 of the fourth positioning cover 11 is located in the fourth branch pipe 20 and clamps the fourth branch pipe 20. Then, the fourth positioning cover 11 is connected to the fourth positioning rod 7. After the fourth positioning cover 11 is connected to the fourth positioning rod 7, the pressure plate 14 of the fourth positioning cover 11 presses the end face of the fourth branch pipe 20. At this time, the fourth branch pipe 20 and the fourth mounting hole 224 can be positioned. Then, the fourth branch pipe 20 is pre-welded to the fourth mounting hole 224 for fixation. Finally, the fourth branch pipe 20 is fully welded to the fourth mounting hole 224.

[0031] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited to this. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A GIS shell welding tool, characterized by: The invention comprises a base, a connecting seat, a supporting column, a first positioning rod, a second positioning rod, a third positioning rod, a fourth positioning rod, a first positioning cover, a second positioning cover, a third positioning cover and a fourth positioning cover, wherein the connecting seat is arranged at the top of the base, the supporting column is arranged at the top of the connecting seat, the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod are detachably arranged on the outer peripheral surface of the supporting column, and the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod can be respectively located in the first branch pipe, the second branch pipe, the third branch pipe and the fourth branch pipe after being connected to the supporting column, the first positioning rod The cover, the second positioning cover, the third positioning cover and the fourth positioning cover are respectively detachably connected to the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod, a portion of the first positioning cover, the second positioning cover and the third positioning cover are respectively adapted to the inner diameters of the first flange, the second flange and the third flange, another portion of the first positioning cover, the second positioning cover and the third positioning cover can respectively press the end faces of the first flange, the second flange and the third flange, a portion of the fourth positioning cover is adapted to the inner diameter of the fourth branch pipe, and another portion of the fourth positioning cover can press the end face of the fourth branch pipe.

2. The GIS shell welding tool according to claim 1, characterized in that: The connecting seat and the base are locked and connected by bolts.

3. The GIS shell welding tool according to claim 1, characterized in that: The support column is detachably connected to the connecting seat and the base.

4. The GIS shell welding tool according to claim 1, characterized in that: The outer circumferential surface of the support column is provided with a first threaded hole, a second threaded hole, a third threaded hole and a fourth threaded hole, and the ends of the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod close to the support column are threadedly connected with the first threaded hole, the second threaded hole, the third threaded hole and the fourth threaded hole respectively.

5. The GIS shell welding tool according to claim 1, characterized in that: The first positioning cover, the second positioning cover, the third positioning cover and the fourth positioning cover all include positioning parts and pressure plates connected to each other. The positioning parts of the first positioning cover, the second positioning cover and the third positioning cover are respectively adapted to the inner diameters of the first flange, the second flange and the third flange, and are respectively located in the first flange, the second flange and the third flange. The pressure plates of the first positioning cover, the second positioning cover and the third positioning cover can press the end faces of the first flange, the second flange and the third flange respectively. The positioning part of the fourth positioning cover is adapted to the inner diameter of the fourth branch pipe and is located in the fourth branch pipe. The pressure plate of the fourth positioning cover can press the fourth The end face of the branch pipe, the middle parts of the first positioning cover, the second positioning cover, the third positioning cover and the fourth positioning cover are all provided with locking holes along the length direction, the ends of the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod away from the support column are all provided with fifth threaded holes, the ends of the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod away from the support column are respectively located in the corresponding locking holes, and the first positioning cover, the second positioning cover, the third positioning cover and the fourth positioning cover are respectively locked and connected with the fifth threaded holes of the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod by bolts.

6. The GIS shell welding tool according to claim 2, characterized in that: The connecting seat is provided with a sixth threaded hole that passes through from top to bottom, the top of the base is provided with a seventh threaded hole that passes through from top to bottom, and the bottom surface of the support column is provided with a threaded section, which is threadedly connected to the sixth threaded hole and the seventh threaded hole.

7. A GIS shell welding method, using the GIS shell welding tool according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. First, lock the main shell of the GIS shell on the connecting seat, then connect the first positioning rod, the second positioning rod, the third positioning rod, and the fourth positioning rod to the support column and place them in the first mounting hole, the second mounting hole, the third mounting hole, and the fourth mounting hole respectively; S2. Send the first branch pipe to the first mounting hole and position the first positioning rod in the first mounting hole. Then, position the positioning portion of the first positioning cover in the first flange and clamp the first flange. Then, connect the first positioning cover to the first positioning rod. After the first positioning cover is connected to the first positioning rod, allow the pressure plate of the first positioning cover to press the end face of the first flange. At this time, the first branch pipe and the first mounting hole are positioned. Then, pre-weld the first branch pipe to the first mounting hole to fix it. Finally, fully weld the first branch pipe to the first mounting hole. S3. Send the second branch pipe to the second mounting hole and position the second positioning rod in the second mounting hole. Then, position the positioning portion of the second positioning cover in the second flange and clamp the second flange. Then, connect the second positioning cover to the second positioning rod. After the second positioning cover is connected to the second positioning rod, allow the pressure plate of the second positioning cover to press the end surface of the second flange. At this time, the second branch pipe can be positioned with the second mounting hole. Then, pre-weld the second branch pipe to the second mounting hole to fix it. Finally, fully weld the second branch pipe to the second mounting hole. S4. Send the third branch pipe to the third mounting hole and position the third positioning rod in the third mounting hole. Then, position the positioning portion of the third positioning cover in the third flange and clamp the third flange. Then, connect the third positioning cover to the third positioning rod. After the third positioning cover and the third positioning rod are connected, allow the pressure plate of the third positioning cover to press the end surface of the third flange. At this time, the third branch pipe and the third mounting hole are positioned. Then, pre-weld the third branch pipe to the third mounting hole to fix it. Finally, fully weld the third branch pipe to the third mounting hole. S5. Send the fourth branch pipe to the fourth mounting hole, and let the fourth positioning rod be located in the fourth mounting hole. Then, place the positioning portion of the fourth positioning cover in the fourth branch pipe and clamp the fourth branch pipe. Then, connect the fourth positioning cover to the fourth positioning rod. After the fourth positioning cover is connected to the fourth positioning rod, let the pressure plate of the fourth positioning cover press the end face of the fourth branch pipe. At this time, the fourth branch pipe and the fourth mounting hole can be positioned. Then, pre-weld the fourth branch pipe to the fourth mounting hole for fixation. Finally, fully weld the fourth branch pipe to the fourth mounting hole.

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