A root weld stress calculation method, device, system and storage medium

Abstract

The application provides a root weld stress calculation method, device and system and a storage medium, and belongs to the field of pipeline safety, and the method comprises the following steps: importing a plurality of original pipeline parameters and to-be-calculated pipeline parameters; constructing a finite element model; obtaining a stress fitting model by model analysis of the finite element model through the plurality of original pipeline parameters; calculating the stress of the plurality of original pipeline parameters to obtain the Mises stress; fitting all the Mises stresses through the stress fitting model to obtain a stress calculation curve; and calculating the stress of the to-be-calculated pipeline parameters through the stress calculation curve to obtain a root weld stress calculation result. The application optimizes the construction process, guarantees the safety of the weld, reduces the probability of damage of the pipeline, can effectively calculate the root weld stress level, and avoids the damage of the girth weld.

Description

Technical Field

[0001] This invention mainly relates to the field of pipeline safety technology, specifically to a method, device, system, and storage medium for calculating root weld stress. Background Technology

[0002] China has a long natural gas pipeline network, and large-diameter, high-pressure, and high-grade steel pipelines remain the future trend. According to statistics, root cracks in circumferential welds are one of the main forms of circumferential weld failure.

[0003] After the root weld is completed, the inner jointing device must be removed to proceed with the assembly of the next weld. At this time, the root weld thickness is relatively small, and it is easily damaged under the weight of the pipeline and external impact loads. Therefore, calculating the root weld stress of the inner jointing device assembly and optimizing the construction process to ensure the safety of the weld is of paramount importance to ensuring pipeline safety. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method, apparatus, system and storage medium for calculating root weld stress, in order to address the shortcomings of the prior art.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A method for calculating root weld stress, comprising the following steps:

[0006] Import multiple raw pipe parameters and pipe parameters to be calculated;

[0007] A finite element model is constructed, and the model is analyzed using multiple original pipe parameters to obtain a stress fitting model.

[0008] Stress calculations are performed on multiple original pipe parameters to obtain the Mises stress corresponding to each original pipe parameter.

[0009] The stress calculation curve is obtained by fitting all the Mises stresses using the stress fitting model.

[0010] The stress calculation results of the root weld are obtained by performing stress calculation on the parameters of the pipeline to be calculated using the stress calculation curve.

[0011] Another technical solution of the present invention to solve the above-mentioned technical problems is as follows: A root weld stress calculation device, comprising:

[0012] The import module is used to import multiple raw pipe parameters and pipe parameters to be calculated.

[0013] The model analysis module is used to construct a finite element model and perform model analysis on the finite element model using multiple original pipe parameters to obtain a stress fitting model.

[0014] The stress calculation module is used to perform stress calculations on multiple original pipe parameters to obtain the Mises stress corresponding to each original pipe parameter.

[0015] The fitting module is used to fit all the Mises stresses using the stress fitting model to obtain stress calculation curves;

[0016] The stress calculation result acquisition module is used to perform stress calculation on the parameters of the pipeline to be calculated through the stress calculation curve to obtain the stress calculation result of the root weld.

[0017] Based on the above-mentioned method for calculating root weld stress, the present invention also provides a root weld stress calculation system.

[0018] Another technical solution of the present invention to solve the above-mentioned technical problems is as follows: a root weld stress calculation system, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the root weld stress calculation method described above is implemented.

[0019] Based on the above-mentioned method for calculating root weld stress, the present invention also provides a computer-readable storage medium.

[0020] Another technical solution of the present invention to solve the above-mentioned technical problems is as follows: a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the root weld stress calculation method as described above.

[0021] The beneficial effects of this invention are as follows: by analyzing the finite element model using the original pipeline parameters, a stress fitting model is obtained; the stress of the original pipeline parameters is calculated to obtain the Mises stress; the stress fitting model is used to fit the Mises stress to obtain a stress calculation curve; and the stress calculation curve is used to calculate the stress of the pipeline parameters to be calculated to obtain the root weld stress calculation result. This optimizes the construction process, ensures the safety of the weld, reduces the probability of pipeline damage, effectively calculates the root weld stress level, and avoids damage to the circumferential weld. Attached Figure Description

[0022] Figure 1 A flowchart illustrating a method for calculating root weld stress according to an embodiment of the present invention;

[0023] Figure 2 A pipe assembly process diagram for a root weld stress calculation method provided in an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of a root weld model with equal wall thickness provided in an embodiment of the present invention for a method of calculating root weld stress;

[0025] Figure 4 A schematic diagram of a variable wall thickness root weld model for a root weld stress calculation method provided in an embodiment of the present invention;

[0026] Figure 5 A schematic diagram of a pre-trained pipe model for a root weld stress calculation method provided in an embodiment of the present invention;

[0027] Figure 6 A block diagram of a root weld stress calculation device provided in an embodiment of the present invention. Detailed Implementation

[0028] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0029] Figure 1 This is a flowchart illustrating a method for calculating root weld stress according to an embodiment of the present invention.

[0030] like Figure 1 As shown, a method for calculating root weld stress includes the following steps:

[0031] Import multiple raw pipe parameters and pipe parameters to be calculated;

[0032] A finite element model is constructed, and the model is analyzed using multiple original pipe parameters to obtain a stress fitting model.

[0033] Stress calculations are performed on multiple original pipe parameters to obtain the Mises stress corresponding to each original pipe parameter.

[0034] The stress calculation curve is obtained by fitting all the Mises stresses using the stress fitting model.

[0035] The stress calculation results of the root weld are obtained by performing stress calculation on the parameters of the pipeline to be calculated using the stress calculation curve.

[0036] It should be understood that a finite element calculation model (i.e., finite element model) is established, the root weld stress (i.e., Mises stress) is calculated, and the relationship between stress and factors is fitted.

[0037] In the above embodiments, a stress fitting model is obtained by analyzing the finite element model using the original pipeline parameters. The stress of the original pipeline parameters is calculated to obtain the Mises stress. The stress fitting model is used to fit the Mises stress to obtain the stress calculation curve. The stress calculation curve is used to calculate the stress of the pipeline parameters to be calculated to obtain the root weld stress calculation result. This optimizes the construction process, ensures the safety of the weld, reduces the probability of pipeline damage, effectively calculates the root weld stress level, and avoids circumferential weld damage.

[0038] Optionally, as an embodiment of the present invention, the original pipe parameters include pipe diameter data, wall thickness data, and steel grade data. The process of constructing a finite element model and performing model analysis on the finite element model using multiple original pipe parameters to obtain a stress fitting model includes:

[0039] A finite element model is constructed, and the finite element model is trained using all the pipe diameter data, all the wall thickness data, and all the steel grade data to obtain the trained finite element model.

[0040] Boundary conditions are calculated for each of the pipe diameter data, the wall thickness data corresponding to each of the original pipe parameters, and the steel grade data corresponding to each of the original pipe parameters, to obtain the bending load corresponding to each of the original pipe parameters.

[0041] The trained finite element model is updated with parameters using all the bending loads to obtain a stress-fitting model.

[0042] In the above embodiments, a stress fitting model was obtained by performing model analysis on the finite element model using multiple original pipeline parameters, which optimized the construction process, ensured the safety of the weld, and reduced the probability of pipeline damage.

[0043] Optionally, as an embodiment of the present invention, such as Figures 1 to 5 As shown, the finite element model includes a pre-trained pipe body model, a pre-trained weld seam model, a pre-trained support pier model, and an initial material model.

[0044] The process of constructing a finite element model, which involves training the finite element model using all the pipe diameter data, all the wall thickness data, and all the steel grade data, to obtain the trained finite element model includes:

[0045] The pre-trained pipe model is trained using all the pipe diameter data and all the steel grade data to obtain the trained pipe model.

[0046] The pre-trained weld model is trained using all the wall thickness data and all the steel grade data to obtain the trained weld model.

[0047] The pre-trained pier model is trained using all the pipe diameter data and all the steel grade data to obtain the trained pier model.

[0048] The initial material model is trained using all the steel grade data to obtain the trained material model;

[0049] The trained finite element model is constructed using the trained pipe model, the trained weld model, the trained support model, and the trained material model.

[0050] It should be understood that the overall model (i.e., the finite element model) can be divided into three parts: the first part is the pipe body (i.e., the pre-trained pipe body model), the second part is the weld (i.e., the pre-trained weld model), and the third part is the support (i.e., the pre-trained support model).

[0051] Specifically, such as Figures 2 to 4 As shown, to accurately simulate the stress distribution of the weld, the weld and a certain length of pipe to its left and right are extracted and a three-dimensional solid model is created. The pipe section mainly reflects the overall stress on the pipeline and its impact on weld performance; therefore, a shell structure is created for this part of the pipe, which improves calculation accuracy and reduces computational load. The support section is modeled using a three-dimensional solid variable structure, which reflects the impact of the support on the pipeline and weld performance. The mechanical properties of the support can be defined, allowing for detailed analysis of the influence of support characteristics on weld performance. Simultaneously, to reflect the contact between the pipeline and the ground, the ground model of the parts that may contact the pipe is created using a three-dimensional solid model.

[0052] It should be understood that, as Figure 5 As shown, to improve computation speed and reduce time consumption, a shell model is used for all parts of the pipeline except for welds and connected pipe sections. The wall thickness is determined according to the definition, and there are 5 integration points in the thickness direction, which can well ensure the accuracy and precision of the calculation. Shell-solid coupling is used between the pipe body and the welded pipe.

[0053] In the above embodiments, the finite element model is trained using pipe diameter data, wall thickness data, and steel grade data to obtain the trained finite element model, which reduces the amount of computation and allows for a detailed analysis of the impact of support features on weld performance, ensuring the accuracy and precision of the calculation.

[0054] Optionally, as an embodiment of the present invention, the steel grade data includes yield stress, elastic modulus, yield strength, yield offset, and strain hardening exponent, and the initial material model includes the Ramberg-Osgood constitutive model.

[0055] The process of training the initial material model using all the steel grade data to obtain the trained material model includes:

[0056] The yield strain corresponding to each of the original pipe parameters is obtained by calculating the yield stress, elastic modulus corresponding to each of the original pipe parameters, yield strength corresponding to each of the original pipe parameters, yield offset corresponding to each of the original pipe parameters, and strain hardening index corresponding to each of the original pipe parameters using the first formula. The first formula is:

[0057]

[0058] Where, ε i Let σ be the yield strain corresponding to the i-th original pipe parameter. i E represents the yield stress corresponding to the i-th original pipe parameter. i Let α be the elastic modulus corresponding to the i-th original pipe parameter. i This represents the yield offset corresponding to the i-th original pipe parameter. Let n be the yield strength corresponding to the i-th original pipe parameter. i is the strain hardening index corresponding to the i-th original pipe parameter;

[0059] The Ramberg-Osgood constitutive model is updated with parameters based on all the stated yield strain variables to obtain the trained material model.

[0060] It should be understood that the current material constitutive model is mainly for the pipe body and the circumferential weld. The material of the pipe body is selected as X80, and the material of the circumferential weld is selected as X70. The material properties should adopt the Ramberg-Osgood constitutive model.

[0061] Specifically, the Ramberg-Osgood constitutive model was the first to propose the three-parameter stress-strain relationship curve for steel, namely the famous Ramberg-Osgood curve. The RO model is often used to describe stiffness degradation models. The RO model consists of a skeleton curve and a hysteresis curve.

[0062] Specifically, the strain relationship between yielding and tensile strength can be expressed as follows:

[0063]

[0064] Where ε is strain, σ is stress, E is elastic modulus, and σ y α represents the yield strength, and n represents the strain hardening exponent. α represents the yield offset, as shown in Table 1, which contains the key values ​​of the material constitutive curve.

[0065] Table 1

[0066]

[0067] In the above embodiments, the initial material model is trained using all steel grade data to obtain a trained material model, which optimizes the construction process, ensures the safety of the weld, reduces the probability of pipeline damage, effectively calculates the root weld stress level, and avoids circumferential weld damage.

[0068] Optionally, as an embodiment of the present invention, the pipe diameter data includes the diameter and length of a single pipe section, the wall thickness data includes the wall thickness value, and the steel grade data includes the steel density.

[0069] The process of calculating boundary conditions for each of the pipe diameter data, the wall thickness data corresponding to each of the original pipe parameters, and the steel grade data corresponding to each of the original pipe parameters, to obtain the bending load corresponding to each of the original pipe parameters, includes:

[0070] By calculating the boundary conditions for each of the single-section pipe diameters, the single-section pipe lengths corresponding to each of the original pipe parameters, the wall thicknesses corresponding to each of the original pipe parameters, and the steel densities corresponding to each of the original pipe parameters using the second formula, the bending load corresponding to each of the original pipe parameters is obtained. The second formula is:

[0071]

[0072] in, Let C be the bending load corresponding to the i-th original pipe parameter. f To preset the pressure loss impact load coefficient of the pipe laying machine, ρ i Let g be the density of the steel corresponding to the i-th original pipe parameter, g be the acceleration due to gravity, and D be the density of the steel. i Let t be the diameter of a single pipe section corresponding to the i-th original pipe parameter. i Let L be the wall thickness value corresponding to the i-th original pipe parameter. i Let be the length of a single pipe section corresponding to the i-th original pipe parameter.

[0073] Specifically, the pipeline and circumferential weld are mainly subjected to lifting loads, their own weight, and the loads of the supports. In addition to overcoming the self-weight of a single joint, the lifting load also requires additional bending loads to complete the placement of the supports, as shown in the following formula:

[0074] F lift =πC f ρg(Dt)tL

[0075] Where: ρ is the density of steel (kg / m3), D is the diameter of a single pipe section (m), t is the wall thickness (m), L is the length of a single pipe section (m), g is the acceleration due to gravity (m / s2), and C... f This is the pressure loss impact load coefficient of the pipe-laying machine.

[0076] It should be understood that the impact load (i.e. the preset pressure loss impact load coefficient of the pipe laying machine) is divided into three states, as shown in Table 2. Table 2 shows the pressure loss impact load and coefficient of the pipe laying machine.

[0077] Table 2

[0078]

[0079] In the above embodiments, boundary conditions are calculated for each pipe diameter data, the wall thickness data corresponding to each original pipe parameter, and the steel grade data corresponding to each original pipe parameter, respectively, to obtain the bending load corresponding to each original pipe parameter. This optimizes the construction process, ensures the safety of the weld, reduces the probability of pipe damage, and can effectively calculate the root weld stress level.

[0080] Optionally, as an embodiment of the present invention, the original pipe parameters also include the weld thickness, and the wall thickness data includes wall thickness values.

[0081] The process of performing stress calculations on multiple original pipe parameters to obtain the Mises stress corresponding to each original pipe parameter includes:

[0082] By performing stress calculations on each of the root weld thicknesses and all the wall thicknesses using the third equation, the Mises stress corresponding to each of the original pipe parameters is obtained. The third equation is:

[0083]

[0084] in,

[0085] Among them, S i H is the Mises stress corresponding to the i-th original pipe parameter. i The root weld thickness corresponds to the i-th original pipe parameter. t represents the average wall thickness. i Let be the wall thickness value corresponding to the i-th original pipe parameter, and m be the total number of original pipe parameters.

[0086] Specifically, based on the finite element calculation results, the formula that can be fitted to the relationship between Mises stress, wall thickness, and root weld thickness is:

[0087] S = 475.11 - 88.24 * H + 9.91T

[0088] Where: H is the root weld thickness (mm), T is the wall thickness (mm) (i.e., the wall thickness value), and the average value is taken for variable wall thickness.

[0089] In the above embodiments, the stress corresponding to each original pipeline parameter is obtained by performing stress calculations on each root weld thickness and all wall thickness values ​​using the third formula. This optimizes the construction process, ensures the safety of the weld, reduces the probability of pipeline damage, and can effectively calculate the root weld stress level.

[0090] Optionally, as another embodiment of the present invention, which belongs to the field of oil and gas pipeline laying, this invention is used to calculate the root weld stress during the pipeline welding assembly process. The present invention is applicable to pipelines with a diameter of 1219mm, steel grade X80, different wall thicknesses, and different root weld thicknesses. By establishing the basic parameters of the pipeline and building a finite element model of the pipeline, the assembly process based on the internal fitting device is analyzed, and the root weld stress values ​​under different factor parameters are extracted. A root weld stress calculation formula is formed through data fitting. This effectively calculates the root weld stress level and avoids damage to the circumferential weld.

[0091] Optionally, as another embodiment of the present invention, the present invention can be applied to pipes with a diameter of 1219mm, steel grade X80, different wall thicknesses, and different root weld thicknesses, and can perform root weld stress analysis based on pipe diameter, steel grade, length, and wall thickness. Furthermore, the root weld stress calculation model comprehensively considers pipe specifications and welding processes, including pipe diameter, wall thickness, steel grade, and root weld thickness.

[0092] Alternatively, as another embodiment of the present invention, the present invention can perform stress analysis of pipe root welds based on pipe diameter, steel grade, length and wall thickness to determine the safety of root welds.

[0093] Alternatively, as another embodiment of the present invention, the steps of the present invention are as follows:

[0094] Step 1: Determine the model information such as pipe diameter, material, and wall thickness;

[0095] Step 2: Establish a finite element model;

[0096] Step 3: Calculate the root weld stress;

[0097] Step 4: Fit the relationship between stress and factors to form a stress calculation formula;

[0098] Step 5: Apply the calculation formula to the actual situation on site.

[0099] Figure 6 A block diagram of a root weld stress calculation device provided in an embodiment of the present invention.

[0100] Alternatively, as another embodiment of the present invention, such as Figure 6 As shown, a root weld stress calculation device includes:

[0101] The import module is used to import multiple raw pipe parameters and pipe parameters to be calculated.

[0102] The model analysis module is used to construct a finite element model and perform model analysis on the finite element model using multiple original pipe parameters to obtain a stress fitting model.

[0103] The stress calculation module is used to perform stress calculations on multiple original pipe parameters to obtain the Mises stress corresponding to each original pipe parameter.

[0104] The fitting module is used to fit all the Mises stresses using the stress fitting model to obtain stress calculation curves;

[0105] The stress calculation result acquisition module is used to perform stress calculation on the parameters of the pipeline to be calculated through the stress calculation curve to obtain the stress calculation result of the root weld.

[0106] Optionally, as an embodiment of the present invention, the original pipeline parameters include pipe diameter data, wall thickness data, and steel grade data, and the model analysis module is specifically used for:

[0107] A finite element model is constructed, and the finite element model is trained using all the pipe diameter data, all the wall thickness data, and all the steel grade data to obtain the trained finite element model.

[0108] Boundary conditions are calculated for each of the pipe diameter data, the wall thickness data corresponding to each of the original pipe parameters, and the steel grade data corresponding to each of the original pipe parameters, to obtain the bending load corresponding to each of the original pipe parameters.

[0109] The trained finite element model is updated with parameters using all the bending loads to obtain a stress-fitting model.

[0110] Optionally, another embodiment of the present invention provides a root weld stress calculation system, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the root weld stress calculation method as described above. This system can be a computer or similar system.

[0111] Optionally, another embodiment of the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the root weld stress calculation method as described above.

[0112] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0113] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the above-described apparatus and unit can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0114] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0115] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the embodiments of the present invention, depending on actual needs.

[0116] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0117] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0118] 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 within the protection scope of the present invention.

Claims

1. A method for calculating root weld stress, characterized in that, Includes the following steps: Import multiple raw pipe parameters and pipe parameters to be calculated; A finite element model is constructed, and the model is analyzed using multiple original pipe parameters to obtain a stress fitting model. Stress calculations are performed on multiple original pipe parameters to obtain the Mises stress corresponding to each original pipe parameter. The stress calculation curve is obtained by fitting all the Mises stresses using the stress fitting model. The stress calculation results of the root weld are obtained by performing stress calculation on the parameters of the pipeline to be calculated using the stress calculation curve. The original pipeline parameters include pipe diameter data, wall thickness data, and steel grade data; The finite element model includes a pre-trained pipe body model, a pre-trained weld seam model, a pre-trained support pier model, and an initial material model. The process of constructing a finite element model, which involves training the finite element model using all the pipe diameter data, all the wall thickness data, and all the steel grade data, to obtain the trained finite element model includes: The pre-trained pipe model is trained using all the pipe diameter data and all the steel grade data to obtain the trained pipe model. The pre-trained weld model is trained using all the wall thickness data and all the steel grade data to obtain the trained weld model. The pre-trained pier model is trained using all the pipe diameter data and all the steel grade data to obtain the trained pier model. The initial material model is trained using all the steel grade data to obtain the trained material model; A post-training finite element model is constructed using the post-training pipe model, the post-training weld model, the post-training support model, and the post-training material model. The steel grade data includes yield stress, elastic modulus, yield strength, yield offset, and strain hardening exponent. The initial material model includes the Ramberg-Osgood constitutive model. The process of training the initial material model using all the steel grade data to obtain the trained material model includes: The yield strain corresponding to each of the original pipe parameters is obtained by calculating the yield stress, elastic modulus corresponding to each of the original pipe parameters, yield strength corresponding to each of the original pipe parameters, yield offset corresponding to each of the original pipe parameters, and strain hardening index corresponding to each of the original pipe parameters using the first formula. The first formula is: ， in, For the first The yield strain corresponding to each original pipeline parameter For the first Yield stress corresponding to each original pipe parameter For the first The elastic modulus corresponding to the original pipe parameters For the first Yield offset corresponding to each original pipe parameter For the first Yield strength corresponding to each original pipe parameter For the first The strain hardening index corresponding to each original pipeline parameter; The Ramberg-Osgood constitutive model is updated with parameters based on all the stated yield strain variables to obtain the trained material model.

2. The root weld stress calculation method according to claim 1, characterized in that, The process of constructing a finite element model and performing model analysis on the finite element model using multiple original pipe parameters to obtain a stress fitting model includes: Boundary conditions are calculated for each of the pipe diameter data, the wall thickness data corresponding to each of the original pipe parameters, and the steel grade data corresponding to each of the original pipe parameters, to obtain the bending load corresponding to each of the original pipe parameters. The trained finite element model is updated with parameters using all the bending loads to obtain a stress-fitting model.

3. The root weld stress calculation method according to claim 2, characterized in that, The pipe diameter data includes the diameter and length of a single pipe section; the wall thickness data includes the wall thickness value; and the steel grade data includes the steel density. The process of calculating boundary conditions for each of the pipe diameter data, the wall thickness data corresponding to each of the original pipe parameters, and the steel grade data corresponding to each of the original pipe parameters, to obtain the bending load corresponding to each of the original pipe parameters, includes: By calculating the boundary conditions for each of the single-section pipe diameters, the single-section pipe lengths corresponding to each of the original pipe parameters, the wall thicknesses corresponding to each of the original pipe parameters, and the steel densities corresponding to each of the original pipe parameters using the second formula, the bending load corresponding to each of the original pipe parameters is obtained. The second formula is: ， in, For the first The bending load corresponding to the original pipe parameters To preset the pressure loss impact load coefficient of the pipe laying machine, For the first The steel density corresponding to the original pipeline parameters It is the acceleration due to gravity. For the first The single-section pipe diameter corresponding to the original pipe parameters For the first The wall thickness value corresponding to each original pipe parameter. For the first The length of a single pipe section corresponding to the original pipe parameters.

4. The root weld stress calculation method according to claim 2, characterized in that, The original pipe parameters also include the weld thickness, and the wall thickness data includes wall thickness values. The process of performing stress calculations on multiple original pipe parameters to obtain the Mises stress corresponding to each original pipe parameter includes: By performing stress calculations on each of the root weld thicknesses and all the wall thicknesses using the third equation, the Mises stress corresponding to each of the original pipe parameters is obtained. The third equation is: ， in, , in, For the first The Mises stress corresponding to each original pipe parameter For the first The root weld thickness corresponding to the original pipe parameters This represents the average wall thickness. For the first The wall thickness value corresponding to each original pipe parameter. This represents the total number of original pipeline parameters.

5. A root weld stress calculation device, characterized in that, include: The import module is used to import multiple raw pipe parameters and pipe parameters to be calculated. The model analysis module is used to construct a finite element model and perform model analysis on the finite element model using multiple original pipe parameters to obtain a stress fitting model. The stress calculation module is used to perform stress calculations on multiple original pipe parameters to obtain the Mises stress corresponding to each original pipe parameter. The fitting module is used to fit all the Mises stresses using the stress fitting model to obtain stress calculation curves; The stress calculation result acquisition module is used to perform stress calculation on the parameters of the pipeline to be calculated through the stress calculation curve, and obtain the stress calculation result of the root weld. The original pipeline parameters include pipe diameter data, wall thickness data, and steel grade data; The finite element model includes a pre-trained pipe body model, a pre-trained weld seam model, a pre-trained support pier model, and an initial material model. The model analysis module is specifically used for: The pre-trained pipe model is trained using all the pipe diameter data and all the steel grade data to obtain the trained pipe model. The pre-trained weld model is trained using all the wall thickness data and all the steel grade data to obtain the trained weld model. The pre-trained pier model is trained using all the pipe diameter data and all the steel grade data to obtain the trained pier model. The initial material model is trained using all the steel grade data to obtain the trained material model; A post-training finite element model is constructed using the post-training pipe model, the post-training weld model, the post-training support model, and the post-training material model. The steel grade data includes yield stress, elastic modulus, yield strength, yield offset, and strain hardening exponent. The initial material model includes the Ramberg-Osgood constitutive model. In the model analysis module, the process of training the initial material model using all the steel grade data to obtain the trained material model includes: The yield strain corresponding to each of the original pipe parameters is obtained by calculating the yield stress, elastic modulus corresponding to each of the original pipe parameters, yield strength corresponding to each of the original pipe parameters, yield offset corresponding to each of the original pipe parameters, and strain hardening index corresponding to each of the original pipe parameters using the first formula. The first formula is: ， in, For the first The yield strain corresponding to each original pipeline parameter For the first Yield stress corresponding to each original pipe parameter For the first The elastic modulus corresponding to the original pipe parameters For the first Yield offset corresponding to each original pipe parameter For the first Yield strength corresponding to each original pipe parameter For the first The strain hardening index corresponding to each original pipeline parameter; The Ramberg-Osgood constitutive model is updated with parameters based on all the stated yield strain variables to obtain the trained material model.

6. The root weld stress calculation device according to claim 5, characterized in that, The model analysis module is specifically used for: Boundary conditions are calculated for each of the pipe diameter data, the wall thickness data corresponding to each of the original pipe parameters, and the steel grade data corresponding to each of the original pipe parameters, to obtain the bending load corresponding to each of the original pipe parameters. The trained finite element model is updated with parameters using all the bending loads to obtain a stress-fitting model.

7. A root weld stress calculation system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the root weld stress calculation method as described in any one of claims 1 to 4.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the root weld stress calculation method as described in any one of claims 1 to 4.

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