Method and system for improving weld load capacity based on tube end reinforcement sizing optimization

Abstract

The present application relates to the field of pipeline welding, and particularly relates to a method and system for improving the load bearing capacity of a weld based on pipe end reinforcement size optimization, which method comprises: girth welding a first pipeline and a second pipeline to be welded to form a girth welding area; using a finite element analysis method to calculate a pipe end reinforcement size corresponding to a minimum cost when performing submerged arc additive processing on the first pipeline and the second pipeline for the girth welding area; and performing submerged arc welding on the first pipeline to form a first submerged arc additive area and performing submerged arc welding on the second pipeline to form a second submerged arc additive area according to the pipe end reinforcement size. The present application increases the thickness and load bearing area of the girth welding area of the pipe end by means of submerged arc welding at the lowest cost, to achieve finishing of the pipe end, thereby avoiding stress and strain concentration at the girth welding area, and further achieving complete high strength matching of the girth welding area structure, and ultimately achieving the purposes of improving the load bearing capacity of the girth welding area and reducing the failure risk of the girth welding area.

Description

Technical Field

[0001] The present invention relates to the field of pipeline welding, and in particular to a method and system for improving the load-bearing capacity of welds based on optimization of pipe end reinforcement dimensions. Background Art

[0002] Continuous technological breakthroughs have led to the continued construction and development of high-grade steel pipelines. While this has enabled efficient allocation of oil and gas resources, it has also posed significant operational risks due to failures in the girth weld zone (also known as the girth weld joint). Achieving high-strength matching in the girth weld zone is the most effective way to address girth weld failures. However, achieving perfect, uniform high-strength matching is difficult in engineering, resulting in low load-bearing capacity in the girth weld zone. There are two primary methods for increasing a structure's load-bearing capacity: enhancing the inherent strength and toughness of the material itself, or increasing the existing dimensions of the structure.

[0003] Existing research approaches have focused on improving the inherent strength and toughness of the material itself, rarely increasing the existing structural dimensions. For example, structural reinforcement to improve the tensile and compressive properties of pipelines involves fusing a short plastic tube to an electric fusion sleeve, which then seals the fiber layer within the fiber prepreg-reinforced high-pressure composite pipe. Another example of strengthening thin-walled pipe ends is achieved by inserting a liner within the thin-walled pipe itself.

[0004] In addition, while increasing the existing size of the structure to improve the structural load-bearing capacity, the investment cost is also increased. Therefore, how to increase the existing size of the structure to improve the structural load-bearing capacity at the lowest cost is a technical problem that needs to be solved urgently. Summary of the Invention

[0005] The present invention provides a method and system for improving the load-bearing capacity of welds based on optimization of pipe end reinforcement dimensions, in order to solve the above technical problems.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: a method for improving the load-bearing capacity of welds based on optimization of pipe end reinforcement dimensions, comprising:

[0007] S1, splicing the pipe ends of a first pipe and a second pipe to be welded so that the center lines of the first pipe and the second pipe are collinear, and performing girth welding at the spliced ​​portion of the pipe ends of the first pipe and the second pipe to form a girth weld area; wherein the girth weld area includes a first heat-affected zone connected to the first pipe, a second heat-affected zone connected to the second pipe, and a weld material area located between the first heat-affected zone and the second heat-affected zone;

[0008] S2, using a finite element analysis method to calculate the pipe end reinforcement size corresponding to the minimum cost when performing submerged arc additive manufacturing on the girth weld area on the first pipe and the second pipe;

[0009] S3. Based on the pipe end reinforcement size, submerged arc welding is performed on the first pipe and closely adjacent to the first heat-affected zone to form a first submerged arc augmented zone, and submerged arc welding is performed on the second pipe and closely adjacent to the second heat-affected zone to form a second submerged arc augmented zone.

[0010] On the basis of the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, the first submerged arc material-additive zone and the second submerged arc material-additive zone are centrally symmetrical with respect to the welding material zone.

[0012] Furthermore, one end of the first submerged arc additive zone away from the first heat-affected zone forms an angle with the central axis of the first pipe to transition to the outer surface of the first pipe; one end of the second submerged arc additive zone away from the second heat-affected zone forms an angle with the central axis of the second pipe to transition to the outer surface of the second pipe.

[0013] Furthermore, the tube end enhancement dimensions include the additive length and additive thickness of the first submerged arc additive zone or the second submerged arc additive zone; and S2 includes:

[0014] S21, constructing a pipeline girth weld model using a finite element analysis method based on the first pipeline, the second pipeline, and the girth weld area, and applying a given axial tensile load to the pipeline girth weld model to obtain a crack driving force curve of the pipeline girth weld area as a function of axial tensile strain before submerged arc material addition at the pipe end;

[0015] S22, based on the crack driving force curve of the girth weld area of ​​the pipe before submerged arc material addition as a function of axial tensile strain, the ultimate strain bearing capacity of the girth weld under different material addition schemes was analyzed, and a surface with X, Y, and Z coordinates representing the material addition length, material addition thickness, and ultimate strain bearing capacity was obtained.

[0016] S23, in the curved surface, by setting the value of the ultimate strain bearing capacity of the Z axis, obtaining a combination curve of the additive length and additive thickness corresponding to the strain bearing capacity requirement;

[0017] S24, rounding up the minimum additive thickness and the maximum additive thickness on the combination scheme curve, and taking values ​​at intervals of preset thicknesses within the range of the minimum additive thickness rounding up and the maximum additive thickness rounding up, to obtain a plurality of additive thickness schemes, and based on the combination scheme curve, obtaining a plurality of additive length schemes corresponding one-to-one to the plurality of additive thickness schemes;

[0018] Alternatively, the minimum additive length and the maximum additive length on the combination scheme curve are rounded up, and within the range of the minimum additive length rounded up and the maximum additive length rounded up, values ​​are taken at intervals of a preset length to obtain multiple additive length schemes, and based on the combination scheme curve, multiple additive thickness schemes corresponding one-to-one to the multiple additive length schemes are obtained;

[0019] S25, taking the additive thickness and the additive length as decision variables, and minimizing the pipeline additive cost as the optimization objective function, a plurality of the additive thickness schemes and their corresponding plurality of the additive length schemes are selected and compared to obtain an additive length and additive thickness combination scheme corresponding to the minimum additive cost.

[0020] Furthermore, in S21, the pipeline girth weld model is constructed using a finite element analysis method, specifically: the pipeline girth weld model is constructed using ABAQUS software.

[0021] Furthermore, in S21: the crack driving force is characterized by the crack tip opening displacement.

[0022] Furthermore, in the S22: specifically using the Organic software to perform data analysis on the ultimate strain bearing capacity values ​​of the girth weld under different additive schemes.

[0023] Further, in said S24:

[0024] When the minimum additive thickness and the maximum additive thickness on the combination scheme curve are rounded up respectively, and after obtaining a plurality of additive length schemes corresponding one-to-one to the plurality of additive thickness schemes, the method further includes rounding up the plurality of additive length schemes;

[0025] When the minimum additive length and the maximum additive length on the combination scheme curve are rounded up respectively, and after obtaining multiple additive thickness schemes corresponding one-to-one to the multiple additive length schemes, the method further includes rounding up the multiple additive thickness schemes.

[0026] Furthermore, in S25, the optimization objective function is:

[0027] F'=minF=4πfρt0R0L0;

[0028] Where ρ represents the material density of the additive, f represents the unit price of the additive material, R0 represents the outer diameter of the first pipe or the second pipe, F represents the cost corresponding to different combinations of additive length and additive thickness, F' represents the minimum value of F, t0 represents the additive thickness, and L0 represents the additive length.

[0029] Based on the above method for improving the load-bearing capacity of a weld based on optimizing the size of pipe end reinforcement, the present invention also provides a system for improving the load-bearing capacity of a weld based on optimizing the size of pipe end reinforcement, the system comprising:

[0030] a girth welding processing module, configured to splice the pipe ends of a first pipe and a second pipe to be welded so that the center lines of the first pipe and the second pipe are collinear, and girth welding is performed at the spliced ​​portion of the pipe ends of the first pipe and the second pipe to form a girth weld area; wherein the girth weld area includes a first heat-affected zone connected to the first pipe, a second heat-affected zone connected to the second pipe, and a weld material area located between the first heat-affected zone and the second heat-affected zone;

[0031] a pipe end reinforcement size optimization module, configured to calculate, using a finite element analysis method, the pipe end reinforcement size corresponding to the minimum cost when performing submerged arc additive processing on the girth weld area on the first pipe and the second pipe;

[0032] A submerged arc additive processing module is configured to perform submerged arc welding on the first pipe and closely adjacent to the first heat-affected zone according to the pipe end reinforcement size to form a first submerged arc additive zone, and to perform submerged arc welding on the second pipe and closely adjacent to the second heat-affected zone to form a second submerged arc additive zone.

[0033] The beneficial effects of the present invention are as follows: the present invention is based on a method and system for optimizing the enhanced dimensions of the pipe end to improve the bearing capacity of the weld, and increases the thickness and bearing area of ​​the girth weld area of ​​the pipe end by submerged arc welding at the lowest cost to achieve fine processing of the pipe end, thereby avoiding stress and strain concentration in the girth weld area, and further achieving complete high-strength matching of the girth weld area structure, ultimately achieving the purpose of improving the bearing capacity of the girth weld area and reducing the risk of failure of the girth weld area. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A flow chart of a method for improving the load-bearing capacity of welds based on optimization of pipe end reinforcement dimensions according to the present invention;

[0035] Figure 2 Schematic diagram of a pipeline structure obtained by using the method of the present invention to improve the load-bearing capacity of the weld based on the optimization of the pipe end reinforcement size;

[0036] Figure 3 Flowchart for optimizing pipe end reinforcement size;

[0037] Figure 4 The X, Y, and Z coordinates of the surface are the additive length, additive thickness, and ultimate strain bearing capacity, respectively;

[0038] Figure 5Schematic diagram of the curve of the combination of additive length and thickness under different strain bearing capacity requirements;

[0039] Figure 6 This is a structural block diagram of a system for improving the load-bearing capacity of welds based on optimization of pipe end reinforcement dimensions according to the present invention. DETAILED DESCRIPTION

[0040] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0041] like Figure 1 As shown in FIG, the method for improving the load-bearing capacity of the weld based on the optimization of the pipe end reinforcement size includes:

[0042] S1, splicing the pipe ends of a first pipe and a second pipe to be welded so that the center lines of the first pipe and the second pipe are collinear, and performing girth welding at the spliced ​​portion of the pipe ends of the first pipe and the second pipe to form a girth weld area; wherein the girth weld area includes a first heat-affected zone connected to the first pipe, a second heat-affected zone connected to the second pipe, and a weld material area located between the first heat-affected zone and the second heat-affected zone;

[0043] S2, using a finite element analysis method to calculate the pipe end reinforcement size corresponding to the minimum cost when performing submerged arc additive manufacturing on the girth weld area on the first pipe and the second pipe;

[0044] S3. Based on the pipe end reinforcement size, submerged arc welding is performed on the first pipe and closely adjacent to the first heat-affected zone to form a first submerged arc augmented zone, and submerged arc welding is performed on the second pipe and closely adjacent to the second heat-affected zone to form a second submerged arc augmented zone.

[0045] Figure 2This is a schematic diagram of a pipeline structure obtained using the method of the present invention for improving weld load-bearing capacity by optimizing pipe end reinforcement dimensions. A first pipeline 10 and a second pipeline 20 have the same outer diameter. A weld region 30 is formed by girth welding between the first and second pipelines 10, 20. The weld region 30 includes a first heat-affected zone 302 connected to the first pipeline 10, a second heat-affected zone 303 connected to the second pipeline 20, and a weld material zone 301 located between the first and second heat-affected zones 302, 303. First and second submerged arc augmented zones 304, 305 are welded to the surfaces of the first and second pipelines 10, 20 using a submerged arc augmented process, closely conforming to the first and second heat-affected zones 302, 303. The first and second submerged arc augmented zones 304, 305 are centrally symmetrical with respect to the weld material zone 301. An end of the first submerged arc additive zone 304, away from the first heat-affected zone 302, transitions to the outer surface of the first pipe 10 at a preset angle with the central axis of the first pipe 10. An end of the second submerged arc additive zone 305, away from the second heat-affected zone 20, transitions to the outer surface of the second pipe 20 at a preset angle with the central axis of the second pipe 20. Preferably, the preset angle is 37.5°.

[0046] In this embodiment, since the size of the first submerged arc material-enhancing area or the second submerged arc material-enhancing area is the same, the tube end enhancement size is the material-enhancing length and material-enhancing thickness of the first submerged arc material-enhancing area or the second submerged arc material-enhancing area. Figure 2 In the figure, L0 represents the additive length and t0 represents the additive thickness.

[0047] like Figure 3 As shown, the S2 includes:

[0048] S21, constructing a pipeline girth weld model using a finite element analysis method based on the first pipeline, the second pipeline, and the girth weld area, and applying a given axial tensile load to the pipeline girth weld model to obtain a crack driving force curve of the pipeline girth weld area as a function of axial tensile strain before submerged arc material addition at the pipe end;

[0049] S22, based on the crack driving force curve of the girth weld area of ​​the pipe before submerged arc material addition as a function of axial tensile strain, the ultimate strain bearing capacity of the girth weld under different material addition schemes was analyzed, and a surface with X, Y, and Z coordinates representing the material addition length, material addition thickness, and ultimate strain bearing capacity was obtained.

[0050] S23, in the curved surface, by setting the value of the ultimate strain bearing capacity of the Z axis, obtaining a combination curve of the additive length and additive thickness corresponding to the strain bearing capacity requirement;

[0051] S24, rounding up the minimum additive thickness and the maximum additive thickness on the combination scheme curve, and taking values ​​at intervals of preset thicknesses within the range of the minimum additive thickness rounding up and the maximum additive thickness rounding up, to obtain a plurality of additive thickness schemes, and based on the combination scheme curve, obtaining a plurality of additive length schemes corresponding one-to-one to the plurality of additive thickness schemes;

[0052] Alternatively, the minimum additive length and the maximum additive length on the combination scheme curve are rounded up, and within the range of the minimum additive length rounded up and the maximum additive length rounded up, values ​​are taken at intervals of a preset length to obtain multiple additive length schemes, and based on the combination scheme curve, multiple additive thickness schemes corresponding one-to-one to the multiple additive length schemes are obtained;

[0053] S25, taking the additive thickness and the additive length as decision variables, and minimizing the pipeline additive cost as the optimization objective function, a plurality of the additive thickness schemes and their corresponding plurality of the additive length schemes are selected and compared to obtain an additive length and additive thickness combination scheme corresponding to the minimum additive cost.

[0054] Specifically, in S21, the pipeline girth weld model is constructed using a finite element analysis method, specifically: the pipeline girth weld model is constructed using ABAQUS software. The crack driving force is characterized by the crack tip opening displacement (CTOD).

[0055] Specifically, in S22: using the Organic software, data analysis is performed on the ultimate strain bearing capacity values ​​of the girth weld under different additive schemes.

[0056] Figure 4 The X, Y, and Z coordinates are the surface of the additive length, additive thickness, and ultimate strain bearing capacity, respectively. In this embodiment, the ultimate strain bearing capacity of the Z axis is set to 0.5%, 1.0%, 1.5%, 2.0%, and 2.5%, and five corresponding ultimate strain bearing capacity contour lines are obtained, such as Figure 4 ; Then, we can get the combination curve of additive length and thickness under different strain bearing capacity requirements, such as Figure 5 shown.

[0057] Specifically, in said S24:

[0058] When the minimum additive thickness and the maximum additive thickness on the combination scheme curve are rounded up respectively, and after obtaining a plurality of additive length schemes corresponding one-to-one to the plurality of additive thickness schemes, the method further includes rounding up the plurality of additive length schemes;

[0059] When the minimum additive length and the maximum additive length on the combination scheme curve are rounded up respectively, and after obtaining multiple additive thickness schemes corresponding one-to-one to the multiple additive length schemes, the method further includes rounding up the multiple additive thickness schemes.

[0060] Each point on the curve of the combination scheme of the additive length and the additive thickness meets the requirements of the pipeline bearing strain. In order to facilitate on-site welding operations, the present invention rounds up the minimum and maximum values ​​of the additive length or additive thickness in the enhancement scheme. Specifically, in this embodiment, the minimum and maximum additive thickness on the curve of the combination scheme are rounded up as an example, and within the rounding interval, the value is taken at intervals of 0.5mm of the preset thickness to obtain multiple additive thickness schemes, and based on the curve of the combination scheme, multiple additive length schemes corresponding to the multiple additive thickness schemes are obtained.

[0061] In this embodiment, in S25, the optimization objective function is:

[0062] F'=minF=4πfρt0R0L0;

[0063] Where ρ represents the material density of the additive (kg / m 3 ), f represents the unit price of the additive material (yuan / kg), R0 represents the outer diameter of the first pipe or the second pipe (mm), F represents the cost corresponding to different combinations of additive length and additive thickness, F' represents the minimum value of F, t0 represents the additive thickness, and L0 represents the additive length.

[0064] Since the outer diameter R0, material density ρ and material unit price f are fixed after selection, the optimization objective function can be transformed into the problem of minimizing the product of the reinforcement length L0 and the reinforcement thickness t0.

[0065]

[0066] Based on the above method, the additive length and thickness combination that minimizes the additive cost can be determined. The additive length and thickness combinations corresponding to the additive cost are shown in Table 1. If the minimum additive cost corresponds to multiple additive solutions, one solution can be selected based on the actual welding conditions on site.

[0067] Table 1: Additive material cost corresponding to the combination of additive material length and additive material thickness

[0068]

[0069]

[0070] The method of improving the load-bearing capacity of the weld based on the optimization of the pipe end reinforcement size in the present invention uses the submerged arc additive method to thicken the pipe end in the area near the girth weld area on the outer surface of the pipeline according to the actual t0 and the actual L0, so as to solve the problem of high-strength matching that is difficult to achieve in the girth weld area of ​​high-grade steel oil and gas pipelines, reduce the probability of stress concentration in the girth weld area, and effectively improve the load-bearing capacity of the girth weld area, which is of great significance to ensuring the intrinsic safety of high-grade steel oil and gas pipelines.

[0071] Based on the above method for improving the load-bearing capacity of a weld based on optimization of pipe end reinforcement dimensions, the present invention also provides a system for improving the load-bearing capacity of a weld based on optimization of pipe end reinforcement dimensions.

[0072] like Figure 6 As shown, the system based on the optimization of pipe end reinforcement size to improve the load-bearing capacity of the weld includes:

[0073] a girth welding processing module, configured to splice the pipe ends of a first pipe and a second pipe to be welded so that the center lines of the first pipe and the second pipe are collinear, and girth welding is performed at the spliced ​​portion of the pipe ends of the first pipe and the second pipe to form a girth weld area; wherein the girth weld area includes a first heat-affected zone connected to the first pipe, a second heat-affected zone connected to the second pipe, and a weld material area located between the first heat-affected zone and the second heat-affected zone;

[0074] a pipe end reinforcement size optimization module, configured to calculate, using a finite element analysis method, the pipe end reinforcement size corresponding to the minimum cost when performing submerged arc additive processing on the girth weld area on the first pipe and the second pipe;

[0075] A submerged arc additive processing module is configured to perform submerged arc welding on the first pipe and closely adjacent to the first heat-affected zone according to the pipe end reinforcement size to form a first submerged arc additive zone, and to perform submerged arc welding on the second pipe and closely adjacent to the second heat-affected zone to form a second submerged arc additive zone.

[0076] The specific functions of each module in the system for improving the load-bearing capacity of welds based on the optimization of pipe end reinforcement dimensions of the present invention can be found in the specific steps of the method for improving the load-bearing capacity of welds based on the optimization of pipe end reinforcement dimensions of the present invention, and will not be repeated again.

[0077] The present invention is based on a method and system for optimizing the size of pipe end reinforcement to improve the load-bearing capacity of welds. By developing or selecting suitable additive materials and using a submerged arc additive method to thicken the pipe ends, the problem of high-strength matching that is difficult to achieve in the girth weld area of ​​high-grade steel oil and gas pipelines is solved, effectively improving the load-bearing capacity of the girth weld area and ensuring the inherent safety of the oil and gas pipelines. In addition, by optimizing the pipe end size design based on the finite element analysis method, the cost of pipe end reinforcement length and thickness for the strain bearing capacity of the pipeline can be minimized, the strain bearing capacity of the pipeline girth weld can be improved, and the fine processing of the pipe end can be achieved, thereby avoiding stress and strain concentration in the girth weld area, and then achieving complete high-strength matching in the structure of the girth weld area, ultimately achieving the purpose of improving the load-bearing capacity of the girth weld area and reducing the risk of failure in the girth weld area.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for improving the load-bearing capacity of welds based on optimization of pipe end reinforcement dimensions, characterized in that: include: S1, splicing the pipe ends of a first pipe and a second pipe to be welded so that the center lines of the first pipe and the second pipe are collinear, and performing girth welding at the spliced ​​portion of the pipe ends of the first pipe and the second pipe to form a girth weld area; wherein the girth weld area includes a first heat-affected zone connected to the first pipe, a second heat-affected zone connected to the second pipe, and a weld material area located between the first heat-affected zone and the second heat-affected zone; S2, using a finite element analysis method to calculate the pipe end reinforcement size corresponding to the minimum cost when performing submerged arc additive manufacturing on the girth weld area on the first pipe and the second pipe; S3, performing submerged arc welding on the first pipe and closely adjacent to the first heat-affected zone according to the pipe end reinforcement size to form a first submerged arc material-enhancing zone, and performing submerged arc welding on the second pipe and closely adjacent to the second heat-affected zone to form a second submerged arc material-enhancing zone; The tube end enhancement dimensions include the material enhancement length and thickness of the first submerged arc material enhancement zone or the second submerged arc material enhancement zone; S2 includes: S21, constructing a pipeline girth weld model using a finite element analysis method based on the first pipeline, the second pipeline, and the girth weld area, and applying a given axial tensile load to the pipeline girth weld model to obtain a crack driving force curve of the pipeline girth weld area as a function of axial tensile strain before submerged arc material addition at the pipe end; S22, based on the crack driving force curve of the girth weld area of ​​the pipe before submerged arc material addition as a function of axial tensile strain, the ultimate strain bearing capacity of the girth weld under different material addition schemes was analyzed, and a surface with X, Y, and Z coordinates representing the material addition length, material addition thickness, and ultimate strain bearing capacity was obtained. S23, in the curved surface, by setting the value of the ultimate strain bearing capacity of the Z axis, obtaining a combination curve of the additive length and additive thickness corresponding to the strain bearing capacity requirement; S24, rounding up the minimum additive thickness and the maximum additive thickness on the combination scheme curve, and taking values ​​at intervals of preset thicknesses within the range of the minimum additive thickness rounding up and the maximum additive thickness rounding up, to obtain a plurality of additive thickness schemes, and based on the combination scheme curve, obtaining a plurality of additive length schemes corresponding one-to-one to the plurality of additive thickness schemes; Alternatively, the minimum additive length and the maximum additive length on the combination scheme curve are rounded up, and within the range of the minimum additive length rounded up and the maximum additive length rounded up, values ​​are taken at intervals of a preset length to obtain multiple additive length schemes, and based on the combination scheme curve, multiple additive thickness schemes corresponding one-to-one to the multiple additive length schemes are obtained; S25, taking the additive thickness and the additive length as decision variables, and minimizing the pipeline additive cost as the optimization objective function, a plurality of the additive thickness schemes and their corresponding plurality of the additive length schemes are selected and compared to obtain an additive length and additive thickness combination scheme corresponding to the minimum additive cost.

2. The method for improving the load-bearing capacity of welds based on optimization of pipe end reinforcement dimensions according to claim 1, characterized in that: The first submerged arc material-increasing zone and the second submerged arc material-increasing zone are centrally symmetrical with respect to the welding material zone.

3. The method for improving the load-bearing capacity of welds based on optimization of pipe end reinforcement dimensions according to claim 1, characterized in that: One end of the first submerged arc additive zone away from the first heat-affected zone transitions to the outer surface of the first pipe at an angle of preset angle to the central axis of the first pipe; one end of the second submerged arc additive zone away from the second heat-affected zone transitions to the outer surface of the second pipe at an angle of preset angle to the central axis of the second pipe.

4. The method for improving the load-bearing capacity of welds based on optimization of pipe end reinforcement dimensions according to claim 1, characterized in that: In the S21, the pipeline girth weld model is constructed using the finite element analysis method, specifically: the pipeline girth weld model is constructed using ABAQUS software.

5. The method for improving the load-bearing capacity of welds based on optimization of pipe end reinforcement dimensions according to claim 1, characterized in that: In said S21: the crack driving force is characterized by the crack tip opening displacement.

6. The method for improving the load-bearing capacity of welds based on optimization of pipe end reinforcement dimensions according to claim 1, characterized in that: In said S22: specifically using Origin software to perform data analysis on the ultimate strain bearing capacity values ​​of the girth weld under different additive schemes.

7. The method for improving the load-bearing capacity of welds based on optimization of pipe end reinforcement dimensions according to claim 1, characterized in that: In said S24: When the minimum additive thickness and the maximum additive thickness on the combination scheme curve are rounded up respectively, and after obtaining a plurality of additive length schemes corresponding one-to-one to the plurality of additive thickness schemes, the method further includes rounding up the plurality of additive length schemes; When the minimum additive length and the maximum additive length on the combination scheme curve are rounded up respectively, and after obtaining multiple additive thickness schemes corresponding one-to-one to the multiple additive length schemes, the method further includes rounding up the multiple additive thickness schemes.

8. The method for improving the load-bearing capacity of welds based on optimization of pipe end reinforcement dimensions according to claim 1, characterized in that: In the step S25, the optimization objective function is: ； in, represents the material density of the additive, Indicates the unit price of the additive material, Indicates the outer diameter of the first or second pipe, Indicates the cost of different combinations of additive length and additive thickness. express The minimum value of represents the thickness of the additive material, Indicates the additive length.

9. A system for improving the load-bearing capacity of welds based on optimization of pipe end reinforcement dimensions, characterized in that: The method for improving the load-bearing capacity of a weld based on optimization of pipe end reinforcement dimensions as claimed in any one of claims 1 to 8 comprises: a girth welding processing module, configured to splice the pipe ends of a first pipe and a second pipe to be welded so that the center lines of the first pipe and the second pipe are collinear, and girth welding is performed at the spliced ​​portion of the pipe ends of the first pipe and the second pipe to form a girth weld area; wherein the girth weld area includes a first heat-affected zone connected to the first pipe, a second heat-affected zone connected to the second pipe, and a weld material area located between the first heat-affected zone and the second heat-affected zone; a pipe end reinforcement size optimization module, configured to calculate, using a finite element analysis method, the pipe end reinforcement size corresponding to the minimum cost when performing submerged arc additive processing on the girth weld area on the first pipe and the second pipe; A submerged arc additive processing module is configured to perform submerged arc welding on the first pipe and closely adjacent to the first heat-affected zone according to the pipe end reinforcement size to form a first submerged arc additive zone, and to perform submerged arc welding on the second pipe and closely adjacent to the second heat-affected zone to form a second submerged arc additive zone.

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