Design optimization method for weld transfer and integrated forging of lower section of transformer oil tank

Abstract

The invention relates to a design optimization method for weld transfer and integrated forging of a lower section of a transformer oil tank, which comprises the following steps of: dividing the lower section of the transformer oil tank into three areas, and integrating the three areas, namely a first area, a second area and a third area, the second region is located between the first region and the second region; the first area, the second area and the third area are sequentially subjected to butt welding; by means of the arrangement, the transformer oil tank lower section structure with few welding areas can be obtained, an original fillet weld structure is transferred into a butt joint structure, the welding quality is improved, the comprehensive performance of the whole oil tank structure is improved, and deflagration accidents are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer oil tanks, and in particular to a design optimization method for weld transfer and integrated forging of the lower section of a transformer oil tank. Background Art

[0002] At present, with the rise of various emerging industries, the voltage levels of power transmission are also continuously increasing, posing higher requirements for transformers in the transmission lines. During the arc discharge process, the oil undergoes cracking, generating a large pressure, which causes the failure of the transformer oil tank structure. Due to limitations in processing technology and material dimensions, as Figures 1 to 3 shown, currently, conventional welding methods are used to connect various parts of the transformer oil tank: butt welds, lap welds, and T-joint fillet welds. During the process of the oil tank structure being damaged, the welded joints, due to inconsistent structures and grains, are the weakest parts in the structure and are the first to be damaged.

[0003] Due to limitations in material dimensions and the difficulty of processing, it is inevitable to connect the various plates in the oil tank structure by welding. Among several commonly used welding structures, the butt welding method has relatively mature welding parameters and high-quality welded joints. Under suitable welding processes and optimized welding material conditions, the differences in the weld and heat-affected zone do not affect the overall mechanical properties of the entire structure, making it the most suitable welding structure. However, due to the deformation of the welding angle and different welding sequences in lap structures and fillet weld structures, the performance differences between different welding parts may be relatively large.

[0004] Therefore, designing a welding structure with as few welds as possible and making the welding structure adopt the relatively mature butt welding process as much as possible to improve the failure limit of the entire oil tank is an urgent problem to be solved currently. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a design optimization method for weld transfer and integrated forging of the lower section of a transformer oil tank, which has the advantage of being able to transform the original fillet weld structure into a butt joint structure, thereby improving the comprehensive performance of the entire oil tank structure and reducing the occurrence of deflagration accidents.

[0006] The above object of the present invention is achieved through the following technical solutions: A design optimization method for weld transfer and integrated forging of the lower section of a transformer oil tank includes the following steps:

[0007] Divide the lower section of the transformer oil tank into three regions, and integrally form each of the three regions. Among them, the three regions include a first region, a second region, and a third region, and the second region is located between the first region and the second region;

[0008] Weld the first region, the second region, and the third region in sequence.

[0009] Preferably, for the design optimization method of weld transfer and integrated forging of the lower section of the transformer tank provided by the present invention, the lower section of the transformer tank is divided into three regions, and the three regions are all integrally formed, including:

[0010] Divide the lower section of the transformer tank into the first region, the second region, and the third region;

[0011] Both the first region and the third region are forged from a first steel plate;

[0012] The second region is integrally bent from a second steel plate.

[0013] Preferably, for the design optimization method of weld transfer and integrated forging of the lower section of the transformer tank provided by the present invention, both the first region and the third region are forged from a first steel plate, including: forging the first steel plate into a bottom plate unit, two first wall surfaces, and a second wall surface, the two first wall surfaces are respectively arranged on the top surfaces of opposite ends of the bottom plate unit, the second wall surface is arranged on the side of the bottom plate unit away from the second region, and the ends of the two first wall surfaces away from the second region are respectively connected to opposite ends of the second wall surface.

[0014] Preferably, for the design optimization method of weld transfer and integrated forging of the lower section of the transformer tank provided by the present invention, the bottom plate unit includes a bottom surface and two arc transition regions, the two arc transition regions are respectively arranged at opposite ends of the bottom surface, the first wall surfaces are arranged corresponding to the arc transition regions one by one, and the two first wall surfaces are respectively arranged at the ends of the two arc transition regions away from the bottom surface.

[0015] Preferably, for the design optimization method of weld transfer and integrated forging of the lower section of the transformer tank provided by the present invention, the second region is integrally bent from a second steel plate, including: bending the second steel plate into a bottom unit and two wall surfaces, the two wall surfaces are respectively arranged on the top surfaces of opposite ends of the bottom unit.

[0016] Preferably, for the design optimization method of weld transfer and integrated forging of the lower section of the transformer tank provided by the present invention, the bottom unit includes a bottom plate and two arc transition sub-regions, the two arc transition sub-regions are respectively arranged at opposite ends of the bottom plate, the wall surfaces are arranged corresponding to the arc transition sub-regions one by one, and the two wall surfaces are respectively arranged at the ends of the two arc transition sub-regions away from the bottom plate.

[0017] Preferably, for the design optimization method of weld transfer and integrated forging of the lower section of the transformer tank provided by the present invention, the butt welding of the first region, the second region, and the third region in sequence includes:

[0018] Butt-weld the side of the bottom surface in the first region facing away from the second wall surface to one side of the bottom plate, butt-weld the side of the arc transition region in the first region facing away from the second wall surface to one side of the arc transition partition, and butt-weld the side of the first wall surface in the first region facing away from the second wall surface to one side of the wall surface;

[0019] Butt-weld the side of the bottom surface in the third region facing away from the second wall surface to the side of the bottom plate facing away from the first region, butt-weld the side of the arc transition region in the third region facing away from the second wall surface to the side of the arc transition partition facing away from the first region, and butt-weld the side of the first wall surface in the third region facing away from the second wall surface to the side of the wall surface facing away from the first region.

[0020] Preferably, for the design optimization method of weld transfer and integrated forging of the lower section of the transformer tank provided by the present invention, the plate thickness of the bottom surface and the bottom plate is both A mm, the plate thickness of the arc transition region and the arc transition partition both continuously decreases from A mm to B mm, and the plate thickness of the first wall surface, the second wall surface, and the wall surface is all B mm, where both A and B are natural numbers greater than zero, and A is greater than B.

[0021] A design optimization method for weld transfer and integrated forging of the lower section of a transformer tank includes the following steps:

[0022] Divide the side wall of the lower section of the transformer tank into four regions;

[0023] Open a groove with a depth of H mm around the bottom plate of the transformer tank, where H is a natural number greater than zero;

[0024] Place the bottoms of the four regions in the groove, butt-weld the four regions end to end in sequence to form a side wall body, and butt-weld the side wall body to the boss on the bottom plate of the transformer tank.

[0025] Preferably, for the design optimization method of weld transfer and integrated forging of the lower section of the transformer tank provided by the present invention, it is characterized in that: the side wall of the lower section of the transformer tank is divided into four regions, including: all four regions are integrally bent and formed using steel.

[0026] In summary, the beneficial technical effects of the present invention are as follows: A design optimization method for weld transfer and integrated forging of the lower section of a transformer tank provided in this application includes the following steps: Divide the lower section of the transformer tank into three regions, and integrally form all three regions. Among them, the three regions include a first region, a second region, and a third region, and the second region is located between the first region and the second region; butt-weld the first region, the second region, and the third region in sequence; with such a setting, a structure of the lower section of the transformer tank with fewer welding areas can be obtained, converting the original fillet weld structure into a butt joint structure, improving the welding quality, thereby improving the comprehensive performance of the entire tank structure and reducing the occurrence of deflagration accidents. Description of the Drawings

[0027] Figure 1 is a cross-sectional view of the original lower section of the transformer tank.

[0028] Figure 2 is a schematic structural diagram of the original fillet weld connection Figure 1 。

[0029] Figure 3 is a schematic diagram of the overall structure of the flowchart of the design optimization method for weld transfer and integrated forging of the lower section of the transformer tank provided in the first embodiment of the present invention.

[0030] Figure 4 is a schematic diagram of the structure of the lower section of the transformer tank in the design optimization method for weld transfer and integrated forging of the lower section of the transformer tank provided in the first embodiment of the present invention.

[0031] Figure 5 is a schematic diagram of the structure of the first region or the third region in the design optimization method for weld transfer and integrated forging of the lower section of the transformer tank provided in the first embodiment of the present invention.

[0032] Figure 6 is a schematic diagram of the structure of the second region in the design optimization method for weld transfer and integrated forging of the lower section of the transformer tank provided in the first embodiment of the present invention.

[0033] Figure 7 is a cross-sectional view of the lower section of the transformer tank in the design optimization method for weld transfer and integrated forging of the lower section of the transformer tank provided in the first embodiment of the present invention.

[0034] Figure 8 is a schematic diagram of the structure of the lower section of the transformer tank in the design optimization method for weld transfer and integrated forging of the lower section of the transformer tank provided in the second embodiment of the present invention.

[0035] Figure 9 is a schematic diagram of the structure of the lower section of the transformer tank in the design optimization method for weld transfer and integrated forging of the lower section of the transformer tank provided in the third embodiment of the present invention.

[0036] Figure 10 It is an exploded view of the lower section of the transformer tank in the design optimization method for weld transfer and integrated forging of the lower section of the transformer tank provided by the third embodiment of the present invention.

[0037] Figure 11 It is a sectional view of the lower section of the transformer tank in the design optimization method for weld transfer and integrated forging of the lower section of the transformer tank provided by the third embodiment of the present invention.

[0038] In the figure, 1 is the transformer tank; 2 is the lower section of the transformer tank; 21 is the first region; 211 is the bottom plate unit, 2111 is the bottom surface, 2112 is the arc transition region; 212 is the first wall surface; 213 is the second wall surface; 22 is the second region; 221 is the bottom unit, 2211 is the bottom plate, 2212 is the arc transition partition; 222 is the wall surface; 23 is the third region; 201 is the tank bottom plate, 2011 is the groove; 202 is the side wall, 2021 is the corner region; 2022 is the straight region; 203 is the butt weld. Detailed implementation manners

[0039] The present invention will be further described in detail below with reference to the accompanying drawings.

[0040] Refer to Figure 1 and Figure 2 Before optimization, the bottom of the structure of the lower section of the transformer tank is connected to the side wall surface by means of T-shaped fillet welds. The welds are distributed throughout the periphery of the bottom of the entire transformer tank 1, and weld overlaps will occur at the four corners, thus affecting the welding quality. However, a design optimization method for weld transfer and integrated forging of the lower section of the transformer tank 2 provided by the present invention transforms the original fillet weld structure into a butt joint structure, improves the welding quality, thereby improving the comprehensive performance of the entire tank structure and reducing the occurrence of deflagration accidents.

[0041] The first embodiment:

[0042] Refer to Figures 3 to 7 A design optimization method for weld transfer and integrated forging of the lower section of the transformer tank 2 disclosed in the present invention includes the following steps:

[0043] S101. Divide the lower section of the transformer tank 2 into three regions, and integrally form all three regions. Among them, the three regions include the first region 21, the second region 22, and the third region 23, and the second region 22 is located between the first region 21 and the second region 22.

[0044] It should be noted that the lower section of the transformer tank 2 refers to the tank bottom plate 201 of the transformer tank 1 and a part of the tank wall connected to the tank bottom plate 201.

[0045] Specifically, since the overall size of the transformer oil tank 1 is relatively large, about 9.6 m in length and about 4.2 m in width, the materials required for forging the bottom and part of the tank wall of the transformer oil tank 1 at the same time are relatively large and it is difficult to manufacture. Therefore, the lower section 2 of the transformer oil tank is divided into three regions.

[0046] S102. Docking and welding the first region 21, the second region 22, and the third region 23 in sequence.

[0047] Specifically, taking Figure 3 the shown orientation as an example, after integrally forming, the first region 21, the second region 22, and the third region 23 are docked and welded from left to right in sequence. Thus, a lower section structure of the transformer oil tank with fewer welding regions can be obtained, converting the original fillet weld structure into a butt joint structure, improving the welding quality, thereby enhancing the comprehensive performance of the entire oil tank structure and reducing the occurrence of deflagration accidents.

[0048] Furthermore, in this embodiment, in S101: Divide the lower section 2 of the transformer oil tank into three regions and integrally form all three regions, including:

[0049] S1011. Divide the lower section 2 of the transformer oil tank into the first region 21, the second region 22, and the third region 23; with such a setting, the welding region is reduced and the comprehensive mechanical properties of the lower section structure of the transformer oil tank are improved.

[0050] S1012. Both the first region 21 and the third region 23 are forged from the first steel plate.

[0051] Among them, in S1012: Both the first region 21 and the third region 23 are forged from the first steel plate, including: Forging the first steel plate into a bottom plate unit 211, two first wall surfaces 212, and a second wall surface 213. The two first wall surfaces 212 are respectively arranged on the top surfaces of the opposite ends of the bottom plate unit 211, the second wall surface 213 is arranged on the side of the bottom plate unit 211 away from the second region 22, and the ends of the two first wall surfaces 212 away from the second region 22 are respectively connected to the opposite ends of the second wall surface 213.

[0052] Specifically, in this embodiment, the bottom plate unit 211 includes a bottom surface 2111 and two arc transition regions 2112. The two arc transition regions 2112 are respectively arranged at the opposite ends of the bottom surface 2111. The first wall surfaces 212 are arranged in one-to-one correspondence with the arc transition regions 2112, and the two first wall surfaces 212 are respectively arranged at the ends of the two arc transition regions 2112 away from the bottom surface 2111; by setting the arc transition region, the original T-shaped fillet weld connection region becomes an arc transition region 2112 obtained by forging means, changing from a sharp corner to a chamfer, and weakening the stress concentration degree of the corresponding part.

[0053] The second wall surface 213 is connected to the bottom surface 2111 through an arc-shaped transition zone.

[0054] S1013. The second region 22 is formed by integrally bending the second steel plate.

[0055] Among them, S1013, the second area 22 is formed by integrally bending the second steel plate, including: bending the second steel plate into a bottom unit 221 and two wall surfaces 222, and the two wall surfaces 222 are respectively arranged on the top surfaces of the opposite ends of the bottom unit 221.

[0056] Specifically, in this embodiment, the bottom unit 221 includes a bottom plate 2211 and two arc transition partitions 2212, the two arc transition partitions 2212 are respectively arranged at opposite ends of the bottom plate 2211, the wall 222 and the arc transition partition 2212 are arranged in a one-to-one correspondence, and the two wall surfaces 222 are respectively arranged at one end of the two arc transition partitions 2212 away from the bottom plate 2211; by setting the arc transition partition 2212, the original T-shaped fillet weld connection area is transformed into an arc transition partition 2212 made by forging means, and the edges and corners are transformed into chamfers, and the stress concentration degree of the corresponding parts is reduced.

[0057] Further, in this embodiment, S102, butt welding the first region 21, the second region 22, and the third region 23 in sequence, comprises:

[0058] S1021, butt-weld the side of the bottom surface 2111 in the first region 21 away from the second wall surface 213 in the region to the side of the bottom plate 2211, butt-weld the side of the arc transition region 2112 in the first region 21 away from the second wall surface 213 in the region to the side of the arc transition partition 2212, and butt-weld the side of the first wall surface 212 in the first region 21 away from the second wall surface 213 in the region to the side of the wall surface 222;

[0059] S1022, butt-weld the side of the bottom surface 2111 in the third area 23 away from the second wall 213 in the area with the side of the bottom plate 2211 away from the first area 21, butt-weld the side of the arc transition area 2112 in the third area 23 away from the second wall 213 in the area with the side of the arc transition partition 2212 away from the first area 21, and butt-weld the side of the first wall 212 in the third area 23 away from the back of the second wall 213 in the area with the side of the wall 222 away from the first area 21; with this arrangement, the lower section structure of the transformer oil tank is transformed from the original T-shaped fillet weld connection to the butt joint between the plates, adopts a more mature welding process, and the overall performance of the structure will be improved.

[0060] Specifically, the first region 21, the second region 22, and the third region 23 are connected by butt welding in sequence. Appropriate welding materials and welding processes are selected according to the properties of the materials for welding. The connection is transferred from the original fillet weld at the bottom and the side wall 202 of the tank to the butt welding connection between the plates, comprehensively improving the overall performance of the lower section structure of the transformer tank.

[0061] Among them, the plate thicknesses of the bottom surface 2111 and the bottom plate 2211 are both Amm. The plate thicknesses of the arc transition region 2112 and the arc transition sub-region 2212 both continuously decrease from Amm to Bmm. The plate thicknesses of the first wall surface 212, the second wall surface 213, and the wall surface 222 are all Bmm. Among them, both A and B are natural numbers greater than zero, and A is greater than B. By setting the bottom surface 2111, the arc transition region 2112, the first wall surface 212, and the second wall surface 213 to be forged into one body, and the bottom plate 2211, the arc transition sub-region 2212, and the wall surface 222 to be bent into one body, the pressure can be dispersed during the petroleum cracking process, and the probability of stress concentration will be reduced.

[0062] Exemplarily, the plate thicknesses of the bottom surface 2111 and the bottom plate 2211 are both 50mm, the plate thicknesses of the first wall surface 212, the second wall surface 213, and the wall surface 222 are all 12mm, and the plate thicknesses of the arc transition region 2112 and the arc transition sub-region 2212 both need to continuously decrease from 50mm to 12mm.

[0063] Second embodiment:

[0064] Continue to refer to Figure 8 , on the basis of the first embodiment, in order to reduce the processing difficulty of the first region 21 and the third region 23, both the first region 21 and the third region 23 are divided into two regions, and then the five regions are connected by butt welding in sequence to form.

[0065] Third embodiment:

[0066] Continue to refer to Figures 9 to 11 , the third embodiment of the present invention provides a design optimization method for weld transfer and integrated forging of the lower section 2 of the transformer tank, including the following steps:

[0067] S201. Divide the side wall 202 of the lower section 2 of the transformer tank 1 into four regions.

[0068] Specifically, the four regions include two corner regions 2021 and two straight regions 2022.

[0069] Among them, S201. Divide the side wall 202 of the lower section 2 of the transformer tank 1 into four regions, including: all four regions are integrally bent and formed by steel.

[0070] S202. Open a groove 2011 with a depth of Hmm around the bottom plate 201 of the transformer oil tank 1, where H is a natural number greater than zero.

[0071] Specifically, open a groove 2011 with a depth of 12 mm around the bottom plate 201 of the transformer oil tank 50 mm thick.

[0072] S203. Place the bottoms of the four regions in the groove 2011, and butt-weld the four regions end to end in sequence to form the side wall 202 body. The side wall 202 body is butt-welded to the boss on the bottom plate 2211 of the bottom plate 201. With this setting, the original T-shaped fillet weld is transferred to a butt weld 203 with relatively stable welding quality and better performance, which can effectively improve the failure limit of the lower part structure of the entire box body, thereby reducing the probability of accidents and the losses caused by accidents.

[0073] Specifically, place the bottoms of the two bent corner regions 2021 and the two straight regions 2022 in the groove 2011. The corner regions 2021 and the straight regions 2022 are alternately arranged in sequence around the circumferential direction of the groove 2011. The four regions are butt-welded end to end in sequence to form the side wall 202 body. The side wall 202 body is butt-welded to the boss on the bottom plate 201 to form a butt weld 203 between the side wall 202 body and the convex on the bottom plate 201.

[0074] A design optimization method for weld transfer and integrated forging of the lower part 2 of a transformer oil tank provided by this application includes the following steps: Divide the lower part 2 of the transformer oil tank into three regions, and integrally form all three regions. Among them, the three regions include the first region 21, the second region 22, and the third region 23, and the second region 22 is located between the first region 21 and the second region 22; butt-weld the first region 21, the second region 22, and the third region 23 in sequence. With this setting, a lower part structure of the transformer oil tank with fewer welding regions can be obtained, the original fillet weld structure is transferred to a butt structure, the welding quality is improved, thereby improving the comprehensive performance of the entire oil tank structure and reducing the occurrence of deflagration accidents.

[0075] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0076] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly illustrating the present invention and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A design optimization method for weld transfer and integrated forging of the lower section of a transformer oil tank, characterized in that: The steps include: Divide the lower section of the transformer oil tank into three areas, and form the three areas in one piece, wherein the three areas include a first area, a second area, and a third area, and the second area is located between the first area and the second area; The first region, the second region and the third region are butt-welded in sequence.

2. The design optimization method for weld transfer and integrated forging of the lower section of the transformer oil tank according to claim 1 is characterized in that: The lower section of the transformer oil tank is divided into three areas, and the three areas are integrally formed, including: Dividing the lower section of the transformer oil tank into the first area, the second area and the third area; The first region and the third region are both forged from a first steel plate; The second area is formed by integrally bending a second steel plate.

3. The design optimization method for weld transfer and integrated forging of the lower section of the transformer oil tank according to claim 2 is characterized in that: The first region and the third region are both forged from a first steel plate, and include: The first steel plate is forged into a bottom plate unit, two first walls and a second wall. The two first walls are respectively arranged on the top surfaces at the opposite ends of the bottom plate unit, the second wall is arranged on the side of the bottom plate unit away from the second area, and the ends of the two first walls away from the second area are respectively connected to the opposite ends of the second wall.

4. The design optimization method for weld transfer and integrated forging of the lower section of the transformer oil tank according to claim 3 is characterized by: The base plate unit includes a bottom surface and two circular arc transition areas, the two circular arc transition areas are respectively arranged at opposite ends of the bottom surface, the first wall surface is arranged in a one-to-one correspondence with the circular arc transition areas, and the two first wall surfaces are respectively arranged at one end of the two circular arc transition areas away from the bottom surface.

5. The design optimization method for weld transfer and integrated forging of the lower section of the transformer oil tank according to claim 4 is characterized in that: The second area is formed by integrally bending a second steel plate, and includes: The second steel plate is bent into a bottom unit and two wall surfaces, and the two wall surfaces are respectively arranged on top surfaces at opposite ends of the bottom unit.

6. The design optimization method for weld transfer and integrated forging of the lower section of the transformer oil tank according to claim 5 is characterized in that: The bottom unit includes a bottom plate and two arc transition partitions, the two arc transition partitions are respectively arranged at opposite ends of the bottom plate, the wall surfaces are arranged in one-to-one correspondence with the arc transition partitions, and the two wall surfaces are respectively arranged at one end of the two arc transition partitions away from the bottom plate.

7. The design optimization method for weld transfer and integrated forging of the lower section of the transformer oil tank according to claim 6 is characterized by: The sequentially butt welding of the first region, the second region, and the third region comprises: Butt-weld the side of the bottom surface in the first region away from the second wall surface to the side of the bottom plate, butt-weld the side of the arc transition region in the first region away from the second wall surface to the side of the arc transition zone, and butt-weld the side of the first wall surface in the first region away from the second wall surface to the side of the wall surface; The side of the bottom surface in the third area facing away from the second wall surface is butt welded to the side of the bottom plate facing away from the first area, the side of the arc transition area in the third area facing away from the second wall surface is butt welded to the side of the arc transition zone facing away from the first area, and the side of the first wall surface in the third area facing away from the second wall surface is butt welded to the side of the wall surface facing away from the first area.

8. The design optimization method for weld transfer and integrated forging of the lower section of the transformer oil tank according to claim 7 is characterized in that: The plate thickness of the bottom surface and the bottom plate is Amm, the plate thickness of the arc transition area and the arc transition partition decreases continuously from Amm to Bmm, and the plate thickness of the first wall surface, the second wall surface and the wall surface is Bmm, wherein A and B are both natural numbers greater than zero, and A is greater than B.

9. A design optimization method for weld transfer and integrated forging of the lower section of a transformer oil tank, characterized in that: The steps include: Divide the side wall of the lower section of the transformer tank into four areas; A groove with a depth of Hmm is provided around the bottom plate of the transformer oil tank, wherein H is a natural number greater than zero; The bottom ends of the four regions are all placed in the grooves, and the four regions are butt-welded end to end in sequence to form a side wall body, and the side wall body is butt-welded to the boss on the box bottom plate.

10. The design optimization method for weld transfer and integrated forging of the lower section of the transformer oil tank according to claim 9, characterized in that: The side wall of the lower section of the transformer oil tank is divided into four areas, including: the four areas are all formed by integral bending of steel.

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