Selection method, system and equipment for heat treatment temperature of welding part and storage medium

Abstract

The invention discloses a welding part heat treatment temperature selection method, system and equipment and a storage medium, and relates to the technical field of online heat treatment.The method comprises the steps that stress distribution of a welding joint of each first welding part before heat treatment and stress distribution of a welding joint of each first welding part after heat treatment are determined through finite element analysis; the corresponding relation between the peak temperature and the residual stress variation is determined; and when heat treatment is carried out on the second welding part, according to the corresponding relation between the peak temperature and the residual stress variation, the target peak temperature when heat treatment is carried out on the second welding part is determined in combination with actual requirements. According to the method, the temperature range of safe heat treatment is widened on the basis of the pressure stress principle, the corresponding relation between the peak temperature and the residual stress variation is quantified, a user can select the proper heat treatment temperature, namely the target peak temperature, according to needs so as to obtain the expected residual stress relief level, and construction safety can be guaranteed.

Description

Technical Field

[0001] This invention relates to the field of online heat treatment technology, and in particular to a method, system, device and storage medium for selecting the heat treatment temperature of welded parts. Background Technology

[0002] Type B sleeve repair technology utilizes two semi-cylindrical half-pipe shells to cover the pipe defect, connected together by side welds, and the ends of the sleeves are fixed to the pipeline by fillet welds. The sleeves can maintain the internal pressure of the pipeline and withstand the axial stress generated by lateral loads on the pipeline. The fillet weld of the Type B sleeve is prone to delayed cracking after welding. Delayed cracking is a type of cold cracking that does not occur immediately after welding, but appears hours, days, or even longer later. Because the delayed cracking time is unpredictable and the construction time window for in-service repairs is relatively short, it is difficult to guarantee whether delayed cracking will occur in the buried pipeline. Delayed cracking requires three conditions: hardened structure, hydrogen, and residual stress. During Type B sleeve repair, the pipeline contains a high-pressure flowing medium, and the rapid cooling rate easily produces a brittle and hardened structure. Simultaneously, due to the stress concentration at the fillet weld and the high restraint at the buried end, residual stress is easily generated after welding. Although low-hydrogen welding materials are now widely used in the repair of type B sleeves, a certain amount of hydrogen will still be introduced into the weld joint due to factors such as air humidity and harsh construction conditions. Therefore, the fillet welds in type B sleeve repairs are at high risk of delayed post-weld cracking, and delayed cracking can easily lead to serious consequences.

[0003] Online induction heat treatment using induction coils allows for precise control of the heating range, heat treatment temperature, and heating / cooling rates. It is energy-efficient, environmentally friendly, and safe, offering broad application prospects. Post-weld heat treatment can improve hardened microstructure, reduce hydrogen content in weld joints, and decrease residual stress, effectively reducing the risk of delayed post-weld cracking. However, heat treatment on high-pressure pipelines presents two challenges:

[0004] 1) The impact of heat treatment temperature selection on the original properties of materials and construction risks. Excessive temperature will change the original properties of high-strength steel, and the high-temperature softening zone may cause construction hazards under high internal pressure.

[0005] 2) There is a lack of quantitative relationship between the peak temperature of heat treatment and the level of residual stress reduction, and there is a lack of data reference on how to reduce the residual stress to an appropriate level according to engineering needs. Summary of the Invention

[0006] The technical problem to be solved by this invention addresses the shortcomings of existing technologies by providing a method, system, equipment, and storage medium for selecting the heat treatment temperature of welded parts, as detailed below:

[0007] 1) In a first aspect, the present invention provides a method for selecting the heat treatment temperature of welded parts, the specific technical solution of which is as follows:

[0008] Through finite element analysis, the stress distribution of the weld joint of each first weldment before and after heat treatment was determined, and the peak heat treatment temperature was different for each first weldment.

[0009] Based on the stress distribution of the weld joint of each first weldment before and after heat treatment, the correspondence between peak temperature and residual stress change is determined.

[0010] When heat-treating the second weldment, the target peak temperature for heat treatment is determined based on the relationship between peak temperature and residual stress change, and in conjunction with actual requirements.

[0011] The first welded component and the second welded component have the same structure.

[0012] The beneficial effects of the method for selecting the heat treatment temperature of welded parts provided by this invention are as follows:

[0013] This invention broadens the temperature range for safe heat treatment based on the compressive stress principle and quantifies the correspondence between peak temperature and residual stress change. Users can obtain the temperature range for safe heat treatment based on the compressive stress principle and failure risk assessment module, and select the appropriate heat treatment temperature, i.e., the target peak temperature, according to their needs to achieve the expected level of residual stress elimination. This invention can be applied to construction sites to select the peak temperature for welded joints on in-service equipment, which helps to ensure construction safety and the operational safety of in-service equipment.

[0014] Based on the above scheme, the method for selecting the heat treatment temperature of welded parts according to the present invention can be further improved as follows.

[0015] Furthermore, it also includes:

[0016] Stress distribution is detected on at least one heat-treated first weldment. Based on all the actual stress distributions obtained from the detection, the accuracy of the correspondence between peak temperature and residual stress change is verified.

[0017] Furthermore, it also includes:

[0018] The stress distribution of the second weldment after heat treatment was determined by finite element analysis, wherein the peak temperature of the second weldment during the heat treatment process is the target peak temperature.

[0019] Based on the stress distribution of the second welded part after heat treatment, the principal stress tensor of the weld joint on the second welded part is determined, and the sign of the principal stress tensor is judged. Based on the judgment result, it is determined whether there is a risk of failure of the weld joint of the second welded part.

[0020] Furthermore, based on the assessment results, it is determined whether there is a risk of failure at the weld joint of the second welded component, including:

[0021] When the principal stress tensor of the weld joint of the second welded component is positive, it is determined that the weld joint of the second welded component is at risk of failure.

[0022] When the principal stress tensor of the weld joint of the second weldment is negative, it is further determined whether the scalar value of the radial stress tensor of the weld joint on the second weldment is greater than the yield strength. If yes, it is determined that the weld joint of the second weldment has a risk of failure. If no, it is determined that the weld joint of the second weldment does not have a risk of failure. The radial stress tensor of the weld joint of the second weldment is determined based on the stress distribution of the second weldment during the heat treatment process.

[0023] Furthermore, both the first and second welded components are: a type B sleeve and a pipe welded together.

[0024] 2) In a second aspect, the present invention also provides a system for selecting the heat treatment temperature of welded parts, the specific technical solution of which is as follows:

[0025] Includes: finite element analysis module, correspondence determination module, and target peak temperature determination module;

[0026] The finite element analysis module is used to: determine the stress distribution of the weld joint of each first weldment before and after heat treatment through finite element analysis, and the peak temperature during the heat treatment process is different for each first weldment;

[0027] The correspondence determination module is used to: determine the correspondence between peak temperature and residual stress change based on the stress distribution of the weld joint of each first weldment before and after heat treatment;

[0028] The target peak temperature determination module is used to: determine the target peak temperature for heat treatment of the second welded part based on the correspondence between the peak temperature and the change in residual stress, and in combination with actual requirements;

[0029] The first welded component and the second welded component have the same structure.

[0030] Based on the above scheme, the heat treatment temperature selection system for welded parts of the present invention can be further improved as follows.

[0031] Furthermore, it also includes an accuracy verification module, which is used for:

[0032] Stress distribution is detected on at least one heat-treated first weldment. Based on all the actual stress distributions obtained from the detection, the accuracy of the correspondence between peak temperature and residual stress change is verified.

[0033] Furthermore, it also includes a failure risk assessment module;

[0034] The finite element analysis module is also used to: determine the stress distribution of the second weldment after heat treatment through finite element analysis, wherein the peak temperature of the second weldment during the heat treatment process is the target peak temperature;

[0035] The failure risk assessment module is used to: determine the principal stress tensor of the weld joint of the second welded part based on the stress distribution of the second welded part after heat treatment, determine the positive or negative sign of the principal stress tensor, and determine whether there is a failure risk of the weld joint of the second welded part based on the assessment result.

[0036] Furthermore, the failure risk assessment module is specifically used for:

[0037] When the principal stress tensor of the weld joint of the second welded component is positive, it is determined that the weld joint of the second welded component is at risk of failure.

[0038] When the principal stress tensor of the weld joint of the second weldment is negative, it is further determined whether the scalar value of the radial stress tensor of the weld joint of the second weldment is greater than the yield strength. If yes, it is determined that the weld joint of the second weldment has a failure risk; otherwise, it is determined that the weld joint of the second weldment does not have a failure risk. The radial stress tensor of the weld joint of the second weldment is determined based on the stress distribution of the second weldment during the heat treatment process.

[0039] Furthermore, both the first and second welded components are: a type B sleeve and a pipe welded together.

[0040] 3) In a third aspect, the present invention also provides an electronic device, the electronic device including a processor coupled to a memory, the memory storing at least one computer program, the at least one computer program being loaded and executed by the processor to enable the electronic device to implement any of the above-mentioned methods for selecting the heat treatment temperature of the weldment.

[0041] 4) In a fourth aspect, the present invention also provides a computer-readable storage medium storing at least one computer program, which is loaded and executed by a processor to enable a computer to implement any of the above-described methods for selecting the heat treatment temperature of a weldment.

[0042] It should be noted that the beneficial effects of the technical solutions of the second to fourth aspects of the present invention and their corresponding possible implementations can be found in the above description of the technical effects of the first aspect and its corresponding possible implementations, and will not be repeated here. Attached Figure Description

[0043] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0044] Figure 1 This is one of the flowcharts illustrating a method for selecting the heat treatment temperature of a welded component according to an embodiment of the present invention;

[0045] Figure 2 von Mises stress cloud diagrams after different heat treatments;

[0046] Figure 3 von Mises stress curves after different heat treatments;

[0047] Figure 4 This is a second schematic flowchart of a method for selecting the heat treatment temperature of a welded component according to an embodiment of the present invention;

[0048] Figure 5 This is a schematic diagram of a heat treatment temperature selection system for welded parts according to an embodiment of the present invention;

[0049] Figure 6 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0051] like Figure 1 As shown, a method for selecting the heat treatment temperature of a weldment according to an embodiment of the present invention includes the following steps:

[0052] S1. Through finite element analysis, the stress distribution of the weld joint of each first weldment before and after heat treatment is determined, and the peak temperature during the heat treatment process is different for each first weldment.

[0053] Finite element analysis can be performed on each welded component before and after heat treatment using software such as ABAQUS simulation software.

[0054] S2. Based on the stress distribution of each first welded joint before and after heat treatment, determine the correspondence between peak temperature and residual stress change.

[0055] S3. When heat treating the second welded part, determine the target peak temperature for heat treating the second welded part based on the correspondence between the peak temperature and the change in residual stress, and in combination with actual requirements.

[0056] The actual needs include practical considerations such as the level of residual stress relief and safe operation.

[0057] The first and second welded parts have the same structure. Both the first and second welded parts are B-type sleeves and pipes welded together, or other welded parts.

[0058] The welded joint includes the weld, fusion zone, and heat-affected zone.

[0059] Specifically, when all the first welded parts are welded type B sleeves, the correspondence between peak temperature and residual stress change refers to the correspondence between peak temperature and the percentage decrease in stress value. This correspondence can be characterized by a table or by a fitted curve between peak temperature and residual stress change.

[0060] The heating rate, holding time at peak temperature, and cooling rate are the same for each of the first welded parts and the second welded parts in their respective heat treatment processes.

[0061] When both the first and second welded components are pre-welded type B sleeves and pipes, the structure and welding process of the type B sleeves and pipes are as follows:

[0062] The X80 pipe was selected as the repair target for the type B sleeve. The X80 pipe has a thickness of 15.3 mm and a fillet weld height of 30.6 mm. The type B sleeve is made of Q345R material and has a thickness of 40 mm. The fillet weld on one side consists of 25 passes. Manual arc welding was used to weld the type B sleeve onto the X80 pipe for repair. E5515-G welding material was selected, with 5 weld overlays, and the heat input was controlled at 0.7 ppm. -1.7KJ / mm (KJ / mm means: the heat present per millimeter of length), the root weld layer consists of 1 pass, with heat input controlled between 0.7-3.0KJ / mm, the filler layer consists of 17 passes, with heat input controlled between 0.7-3.0KJ / mm, and the tempering weld consists of 2 passes to reduce the cooling rate, with heat input controlled between 0.7-1.7KJ / mm. Among them, the weld zone in the welded joint of the B-type sleeve and X80 pipe after welding is the fillet weld zone.

[0063] S1 and S2 are explained as follows:

[0064] 1) S1 is explained as follows:

[0065] ① Based on ABAQUS simulation software, and combined with the structure of the B-type sleeve and pipe and the welding process, a two-dimensional rotating mesh model was established. Using the thermal cycle curve as the heat source, the welding process between the B-type sleeve and the X80 pipe was simulated. Material databases for the B-type sleeve, X80 pipe and weld metal were constructed respectively. Temperature field and stress numerical simulation were performed to obtain the stress distribution (also known as residual stress distribution) of the weld joint on each welded B-type sleeve and pipe before heat treatment.

[0066] ②Based on ABAQUS simulation software, and combined with the structure and welding process of the B-type sleeve and pipe, and the heat treatment process corresponding to each welded B-type sleeve and pipe, the stress distribution of the welded joint on each welded B-type sleeve and pipe after heat treatment is simulated.

[0067] In all heat treatment processes, the heating rate was set to 200℃ / h, the duration at peak temperature was set to 1h, the cooling rate was set to 100℃ / h, and the peak temperatures during the heat treatment processes were set to 200℃, 300℃, 400℃, 450℃, 500℃, 550℃, and 600℃.

[0068] 2) S2 is explained as follows:

[0069] Extract the final stress results from different heat treatment peak temperature groups, plot stress distribution cloud maps at different temperatures, and plot the final stress distribution at typical nodes (e.g., node a, node b, and node c, which can be selected according to actual conditions) to obtain a quantitative curve of the residual stress reduction level, such as... Figure 2 and Figure 3 As shown, the peak temperatures of the heat treatment were 200℃, 300℃, 400℃, 450℃, 500℃, 550℃, and 600℃, respectively, and the average stress decreased by 8%, 12%, 16%, 19%, 22%, 37%, and 43%. That is, at a peak temperature of 200℃, the average stress decreased by 8%; at 300℃, by 12%; at 300℃, by 16%; at 400℃, by 19%; at 450℃, by 22%; at 550℃, by 37%; and at 600℃, by 43%. When heat-treating the second weldment, the target peak temperature for heat treatment was determined based on the relationship between peak temperature and residual stress change, combined with actual requirements.

[0070] Optionally, the above technical solution also includes:

[0071] S02. Perform stress distribution detection on at least one heat-treated first welded part, and verify the accuracy of the correspondence between peak temperature and residual stress change based on all the actual stress distributions obtained from the detection.

[0072] In S02, the first welded part after heat treatment refers to the first welded part after actual heat treatment. Taking the B-type sleeve and pipe welded together as an example, specifically:

[0073] The welded joint between the type B sleeve and the X80 pipe is heat-treated using an induction coil. The specific process is as follows:

[0074] The induction heating zone of the induction coil is 400mm wide. The induction coil is wound around the insulation layer. The welded joint of the B-type sleeve and the X80 pipe is placed near the center of the induction heating zone of the induction coil. The heating rate, the duration at the peak temperature and the cooling rate described above are installed in the heat treatment process. At least one welded B-type sleeve and X80 pipe are heat treated. During the heat treatment, the thermocouple is fixed to the weld toe area to detect and record the temperature change.

[0075] The accuracy of the correlation between peak temperature and residual stress change is verified based on all detected actual stress distributions. The specific implementation process is as follows:

[0076] 1) When stress distribution detection is performed on a first welded component after heat treatment (i.e., the welded B-type sleeve and X80 pipe), an actual stress distribution is obtained. The degree of agreement between this actual stress distribution and the stress distribution of the first welded component (i.e., the welded B-type sleeve and X80 pipe) after heat treatment obtained through finite element analysis is calculated. If the degree of agreement does not exceed the preset degree of agreement threshold, the correspondence between the peak temperature and the change in residual stress is determined to be accurate, and S3 can be executed. If the degree of agreement exceeds the preset degree of agreement threshold, the correspondence between the peak temperature and the change in residual stress is determined to be inaccurate. In this case, the finite element analysis needs to be performed again. For example, the mesh generation criteria or boundary conditions in the finite element analysis should be modified to redetermine the relationship between the peak temperature and the change in residual stress during the heat treatment process.

[0077] 2) When stress distribution detection is performed on at least two heat-treated first welded parts (i.e., the welded B-type sleeve and X80 pipe), multiple actual stress distributions are obtained. The degree of agreement between the actual stress distribution of any heat-treated first welded part (i.e., the welded B-type sleeve and X80 pipe) and the stress distribution of the same first welded part (i.e., the welded B-type sleeve and X80 pipe) after heat treatment obtained through finite element analysis is calculated. It is then determined whether the degree of agreement exceeds a preset degree of agreement threshold. This process continues until multiple judgment results are obtained. The percentage of the judgment results that are "yes" among all judgment results is then determined. If the percentage does not exceed the preset percentage threshold, the correspondence between the peak temperature and the change in residual stress is determined to be accurate, and S3 can be executed. If the percentage exceeds the preset percentage threshold, the correspondence between the peak temperature and the change in residual stress is determined to be inaccurate. In this case, the finite element analysis needs to be performed again, for example, by modifying the mesh generation standard or boundary conditions in the finite element analysis, and redetermining the relationship between the peak temperature and the change in residual stress during the heat treatment process.

[0078] Optionally, the above technical solution also includes:

[0079] S4. Through finite element analysis, determine the stress distribution of the second welded part after heat treatment, wherein the peak temperature of the second welded part during the heat treatment process is the target peak temperature.

[0080] It should be noted that in S4, the second welded part was not actually heat-treated, but the heat treatment process was simulated in the finite element analysis.

[0081] S5. Based on the stress distribution of the second welded part after heat treatment, determine the principal stress tensor of the weld joint of the second welded part, and determine the sign of the principal stress tensor. Based on the determination result, determine whether there is a risk of failure of the weld joint of the second welded part.

[0082] Optionally, in S5, determining whether there is a risk of failure in the weld joint of the second welded component based on the judgment result includes:

[0083] S50. When the principal stress tensor of the weld joint of the second welded part is negative, continue to determine whether the scalar value of the radial stress tensor of the weld joint of the second welded part is greater than the yield strength. If yes, it is determined that the weld joint of the second welded part has a failure risk. If no, it is determined that the weld joint of the second welded part does not have a failure risk. The radial stress tensor of the weld joint of the second welded part is determined based on the stress distribution of the second welded part during the heat treatment process, which can be obtained through numerical simulation.

[0084] If there is no risk of failure at the weld joint of the second welded part, it means that heat treatment can be performed using the target peak temperature. If there is a risk of failure at the weld joint of the second welded part, it means that heat treatment cannot be performed using the target peak temperature, and it is recommended that the user redetermine the target peak temperature.

[0085] Specifically, when the principal stress tensor of the weld joint of the second welded component is negative, it indicates that the weld joint of the second welded component is subjected to tensile stress, and it is determined that the weld joint of the second welded component is at risk of failure. When the principal stress tensor of the weld joint of the second welded component is negative, it indicates that the weld joint of the second welded component is subjected to compressive stress, and it generally will not fail. Therefore, it is necessary to further determine whether the scalar value of the radial stress tensor of the weld joint of the second welded component is greater than the yield strength.

[0086] In another embodiment, such as Figure 4 As shown, it includes:

[0087] 1) Preparation of heat-treated specimens:

[0088] X80 pipe was selected as the type B sleeve repair target. The X80 pipe thickness is 15.3mm, the fillet weld height is 30.6mm, the sleeve material is Q345R, the sleeve thickness is 40mm, and the fillet weld on one side has 25 weld passes. Manual arc welding was used for welding repair, and E5515-G welding material was selected. The weld overlay layer has 5 passes, with heat input controlled at 0.7-1.7KJ / mm. The root weld layer has 1 pass, with heat input controlled at 0.7-3.0KJ / mm. The filler layer has 17 passes, with heat input controlled at 0.7-3.0KJ / mm. The tempering weld has 2 passes to reduce the cooling rate, with heat input controlled at 0.7-1.7KJ / mm. After welding, heat treatment is required to achieve stress relief.

[0089] 2) Selection of heat treatment process parameters, methods for selecting safe heat treatment temperatures, and stress relief assessment for different heat treatment processes:

[0090] The fillet weld area repaired by the type B sleeve was heat-treated using an induction coil. The induction coil was wound around the insulation layer, and the fillet weld area was placed near the center of the induction heating zone, which was 400 mm wide. The heating rate was 200 °C / h. Different control groups were arranged, and the peak temperatures were raised to 200, 200, 300, 400, 450, 500, 550, and 600 °C, respectively. The temperature was held for 1 hour, and then cooled at a rate of 100 °C / h until it reached room temperature of 20 °C. During this process, thermocouples were fixed to the weld toe area to detect and record the temperature changes during the heat treatment.

[0091] 3) Residual stress analysis in the fillet weld zone, finite element analysis of heat treatment, finite element modeling, and pretreatment condition settings:

[0092] Finite element analysis of residual stress in fillet weld zone was performed using ABAQUS. Based on experimental conditions, a two-dimensional rotating mesh model was established. The welding process of fillet weld zone of type B sleeve was simulated using thermal cycling curve as heat source. Material databases for sleeve, X80 pipe and weld zone were constructed respectively. Temperature field and stress numerical simulation of type B sleeve repair were performed to obtain the residual stress distribution in fillet weld zone after type B sleeve repair.

[0093] 4) Extraction of stress field results after heat treatment:

[0094] Finite element analysis of heat treatment was performed using ABAQUS. Based on the simulation results, heating, holding and cooling were carried out using thermal cycling curves. The fillet weld area was placed in the middle of the heating zone, the width of the heating zone was 400 mm, and the heating rate was 200℃ / h. Different control groups were arranged, and the peak temperature was raised to 200, 200, 300, 400, 450, 500, 550 and 600℃ respectively. The temperature was held for 1 hour, and then cooled at a rate of 100℃ / h until it cooled to room temperature of 20℃. The stress field distribution results after heat treatment were obtained.

[0095] 5) Principal stress tensor analysis, specifically analyzing the signs of the principal stress tensors:

[0096] Select a safe temperature for heat treatment, analyze different peak temperature processes for heat treatment, plot cloud diagrams of the heat treatment process, and analyze the principal stress tensors, namely longitudinal, transverse, and tangential stress tensors, by plotting representative node curves.

[0097] To select a safe heat treatment temperature, the sign of the principal stress tensor is determined based on the cloud map and the time-stress curve of representative nodes. A positive sign indicates that there is a risk of failure due to tensile stress, while a negative sign indicates that there is no risk of failure due to compressive stress. The stress is affected by the combined effects of welding thermal expansion stress and internal pressure of the medium.

[0098] When selecting a safe heat treatment temperature, if all principal stress tensors are negative, it is necessary to further determine whether the scalar value of the radial stress is greater than the yield strength in order to ensure the safety of online heat treatment. If it is greater than the yield strength, it indicates that there is a risk of failure and is judged as unsafe. If it is less than the yield strength, it is judged as safe.

[0099] 6) Result accuracy verification: cloud map and typical node analysis, and quantitative assessment of stress relief level, specifically:

[0100] A quantitative assessment of residual stress reduction was conducted. Based on the simulation results, heating, holding, and cooling were performed using thermal cycling curves. The fillet weld area was placed in the middle of the heating zone, which was 400 mm wide. The heating rate was 200 °C / h. Different control groups were arranged, and the peak temperatures were raised to 200, 200, 300, 400, 450, 500, 550, and 600 °C, respectively. The temperature was held for 1 hour, and then cooled at a rate of 100 °C / h until it reached room temperature (20 °C). The stress field distribution after heat treatment was obtained.

[0101] A quantitative assessment of residual stress reduction was conducted by extracting the final stress results from different heat treatment peak temperature groups, plotting stress distribution cloud maps at different temperatures, drawing the final stress distribution at typical nodes, and obtaining a quantitative curve of the residual stress reduction level, such as... Figure 2 and Figure 3 As shown, when the peak heat treatment temperatures are 200, 300, 400, 450, 500, 550, and 600℃, the average stress decreases by 8%, 12%, 16%, 19%, 22%, 37%, and 43%, respectively. The appropriate heat treatment temperature can be selected on-site according to the requirements.

[0102] 7) Select the heat treatment temperature (i.e., the peak heat treatment temperature) according to the requirements.

[0103] The technical solution of this invention comprises two parts: selection of a safe heat treatment temperature and quantitative assessment of the residual stress reduction level.

[0104] 1) The selection of safe heat treatment temperature includes: conducting different test groups, setting the peak heat treatment temperature to 0, 200, 300, 400, 450, 500, 550, and 600℃ respectively; performing finite element analysis for finite element modeling, setting pretreatment conditions, and extracting stress field results; extracting the principal stress tensor during the heat treatment process; determining the sign of the principal stress tensor and the radial stress tensor; if the radial stress is positive, it indicates that the heat treatment temperature is higher than the safe value; if the radial stress is negative, further determining whether the radial stress is less than the radial yield strength; if so, the heat treatment temperature is determined to be safe.

[0105] 2) The quantitative assessment of residual stress reduction level includes: setting different heat treatment peak values, performing finite element modeling through finite element analysis, setting pretreatment conditions and extracting stress field results, using XRD to determine the numerical simulation accuracy of typical processes, analyzing stress field cloud maps and stress levels of typical nodes, quantitatively assessing the stress reduction level, and selecting appropriate heat treatment temperatures according to requirements.

[0106] This invention addresses two key challenges in online heat treatment of high-pressure pipelines (the two technical problems mentioned in the background section). Through a combination of numerical simulation and experimentation, it presents a method for selecting the safe heat treatment temperature, i.e., the target peak temperature, and quantitatively assesses the reduction level of residual stress at different heat treatment temperatures. Based on the principle of compressive stress, it broadens the temperature range for safe heat treatment and quantifies the correspondence between peak temperature and residual stress change. This helps ensure construction safety, assists construction personnel in rationally selecting heat treatment temperatures, and achieves the expected level of residual stress elimination.

[0107] In the above embodiments, although the steps are numbered S1, S2, etc., they are only specific embodiments given by the present invention. Those skilled in the art can adjust the execution order of S1, S2, etc. according to the actual situation, which is also within the protection scope of the present invention. It can be understood that in some embodiments, some or all of the above embodiments may be included.

[0108] like Figure 5 As shown, an embodiment of the present invention provides a system 200 for selecting the heat treatment temperature of a weldment, comprising: a finite element analysis module 201, a correspondence determination module 202, and a target peak temperature determination module 203;

[0109] The finite element analysis module is used for 201: through finite element analysis, the stress distribution of the weld joint of each first weldment before and after heat treatment is determined, and the peak temperature during the heat treatment process is different for each first weldment.

[0110] The correspondence determination module 202 is used to: determine the correspondence between peak temperature and residual stress change based on the stress distribution of the weld joint of each first weldment before and after heat treatment;

[0111] The target peak temperature determination module 203 is used to: determine the target peak temperature for heat treatment of the second welded part based on the correspondence between the peak temperature and the change in residual stress, and in combination with actual requirements, when the second welded part is subjected to heat treatment.

[0112] The first welded component and the second welded component have the same structure.

[0113] Optionally, the above technical solution also includes an accuracy verification module, which is used for:

[0114] Stress distribution is detected on at least one heat-treated first weldment. Based on all the actual stress distributions obtained from the detection, the accuracy of the correspondence between peak temperature and residual stress change is verified.

[0115] Optionally, the above technical solution also includes a failure risk assessment module;

[0116] The finite element analysis module 201 is also used to: determine the stress distribution of the second weldment after heat treatment through finite element analysis, wherein the peak temperature of the second weldment during the heat treatment process is the target peak temperature;

[0117] The failure risk assessment module is used to: determine the principal stress tensor of the weld joint of the second welded part based on the stress distribution of the second welded part after heat treatment, determine the positive or negative sign of the principal stress tensor, and determine whether there is a failure risk of the weld joint of the second welded part based on the assessment result.

[0118] Optionally, in the above technical solution, the failure risk assessment module is specifically used for:

[0119] When the principal stress tensor of the weld joint of the second welded component is positive, it is determined that the weld joint of the second welded component is at risk of failure.

[0120] When the principal stress tensor of the weld joint of the second weldment is negative, it is further determined whether the scalar value of the radial stress tensor of the weld joint of the second weldment is greater than the yield strength. If yes, it is determined that the weld joint of the second weldment has a failure risk; otherwise, it is determined that the weld joint of the second weldment does not have a failure risk. The radial stress tensor of the weld joint of the second weldment is determined based on the stress distribution of the second weldment during the heat treatment process.

[0121] Optionally, in the above technical solution, both the first welded component and the second welded component are: a type B sleeve and a pipe welded together.

[0122] It should be noted that the beneficial effects of the welding heat treatment temperature selection system 200 provided in the above embodiments are the same as those of the welding heat treatment temperature selection method described above, and will not be repeated here. Furthermore, the system provided in the above embodiments is only illustrated by the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the system can be divided into different functional modules according to the actual situation to complete all or part of the functions described above. In addition, the system and method embodiments provided in the above embodiments belong to the same concept, and their specific implementation process is detailed in the method embodiments, and will not be repeated here.

[0123] like Figure 6 As shown, an electronic device 300 according to an embodiment of the present invention includes a processor 320 coupled to a memory 310. The memory 310 stores at least one computer program 330, which is loaded and executed by the processor 320 to enable the electronic device 300 to implement any of the above-mentioned methods for selecting the heat treatment temperature of the welded part. Specifically:

[0124] The electronic device 300 can vary considerably depending on its configuration or performance. It may include one or more processors 320 (Central Processing Units, CPUs) and one or more memories 310. Each memory 310 stores at least one computer program 330, which is loaded and executed by the processors 320 to enable the electronic device 300 to implement any of the welding heat treatment temperature selection methods provided in the above embodiments. Of course, the electronic device 300 may also have wired or wireless network interfaces, a keyboard, and input / output interfaces for input and output. It may also include other components for implementing device functions, which will not be elaborated here. Specifically, the electronic device may be a computer, etc.

[0125] An embodiment of the present invention provides a computer-readable storage medium storing at least one computer program, which is loaded and executed by a processor to enable a computer to implement any of the above-described methods for selecting the heat treatment temperature of a weldment.

[0126] Alternatively, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a compact disc read-only memory (CD-ROM), magnetic tape, a floppy disk, and an optical data storage device, etc.

[0127] In an exemplary embodiment, a computer program product or computer program is also provided, which includes computer instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the electronic device to perform any of the above-described methods for selecting the heat treatment temperature of the weldment.

[0128] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and represent a limitation on a specific order or sequence. Where appropriate, the order of use for similar objects can be interchanged so that the embodiments of this application described herein can be implemented in an order other than that shown or described.

[0129] Those skilled in the art will recognize that this invention can be implemented as a system, method, or computer program product. Therefore, this invention can be specifically implemented in the following forms: it can be entirely hardware, entirely software (including firmware, resident software, microcode, etc.), or a combination of hardware and software, generally referred to herein as a "circuit," "module," or "system." Furthermore, in some embodiments, this invention can also be implemented as a computer program product contained in one or more computer-readable media, which includes computer-readable program code.

[0130] Any combination of one or more computer-readable media can be used. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this invention, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0131] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for selecting the heat treatment temperature of welded parts, characterized in that, The method comprises the following steps: determining the stress distribution of the welding joint of each first welding piece before and after heat treatment through finite element analysis, wherein the corresponding peak temperature of each first welding piece in the heat treatment process is different; determining the corresponding relationship between the peak temperature and the residual stress change amount according to the stress distribution of the welding joint of each first welding piece before and after heat treatment; when the second welding piece is subjected to heat treatment, determining the target peak temperature of the second welding piece in the heat treatment process according to the corresponding relationship between the peak temperature and the residual stress change amount and in combination with the actual demand; wherein the first welding piece and the second welding piece are of the same structure.

2. The method of claim 1, wherein the welding member is a steel member. The method further comprises the following steps: detecting the stress distribution of at least one first welding piece after heat treatment, and verifying the accuracy of the corresponding relationship between the peak temperature and the residual stress change amount according to all the actual stress distributions obtained through detection.

3. The method of claim 2, wherein the welding member is a welding rod. The method further comprises the following steps: determining the stress distribution of the second welding piece after heat treatment through finite element analysis, wherein the peak temperature of the second welding piece in the heat treatment process is the target peak temperature; determining the principal stress tensor of the welding joint of the second welding piece according to the stress distribution of the second welding piece after heat treatment, and judging the positive and negative of the principal stress tensor to determine whether the welding joint of the second welding piece has a failure risk according to the judgment result.

4. The method of claim 3, wherein the welding member is a welding rod. determining whether the welding joint of the second welding piece has a failure risk according to the judgment result, comprising: when the principal stress tensor of the welding joint of the second welding piece is positive, it is determined that the welding joint of the second welding piece has a failure risk; when the principal stress tensor of the welding joint of the second welding piece is negative, it is further determined whether the scalar value of the radial stress tensor of the welding joint of the second welding piece is greater than the yield strength, if yes, it is determined that the welding joint of the second welding piece has a failure risk, and if no, it is determined that the welding joint of the second welding piece does not have a failure risk, wherein the radial stress tensor of the welding joint of the second welding piece is determined according to the stress distribution of the second welding piece in the heat treatment process.

5. The method for selecting a heat treatment temperature of a welded component according to any one of claims 1 to 4, characterized in that, The first welding piece and the second welding piece are both a B-type sleeve and a pipeline welded together.

6. A system for selecting a heat treatment temperature for a welded piece, characterized in that The method comprises the following steps: a finite element analysis module, a corresponding relationship determining module and a target peak temperature determining module; the finite element analysis module is used to determine the stress distribution of the welding joint of each first welding piece before and after heat treatment through finite element analysis, wherein the corresponding peak temperature of each first welding piece in the heat treatment process is different; the corresponding relationship determining module is used to determine the corresponding relationship between the peak temperature and the residual stress change amount according to the stress distribution of the welding joint of each first welding piece before and after heat treatment; the target peak temperature determining module is used to determine the target peak temperature of the second welding piece in the heat treatment process according to the corresponding relationship between the peak temperature and the residual stress change amount and in combination with the actual demand when the second welding piece is subjected to heat treatment; wherein the first welding piece and the second welding piece are of the same structure.

7. The system for selecting a heat treatment temperature of a welded component according to claim 6, characterized in that The method further comprises a precision verification module, which is used to The stress distribution of the at least one first welding piece after heat treatment is detected, and the correspondence between the peak temperature and the residual stress change amount is verified in accuracy according to all the actual stress distributions obtained through detection.

8. The system for selecting a heat treatment temperature of a welded component according to claim 7, wherein The failure risk judgment module is further included. The finite element analysis module is further configured to determine the stress distribution of the second welding piece after heat treatment through finite element analysis, wherein the peak temperature in the heat treatment process of the second welding piece is a target peak temperature. The failure risk judgment module is configured to determine the principal stress tensor of the welding joint of the second welding piece according to the stress distribution of the second welding piece after heat treatment, judge the positive and negative of the principal stress tensor, and determine whether the welding joint of the second welding piece has a failure risk according to the judgment result.

9. An electronic device, comprising: The electronic device includes a processor coupled with a memory, and the memory stores at least one computer program, which is loaded and executed by the processor to enable the electronic device to implement the method for selecting a heat treatment temperature of a welding piece according to any one of claims 1 to 5.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium stores at least one computer program, which is loaded and executed by the processor to enable the computer to implement the method for selecting a heat treatment temperature of a welding piece according to any one of claims 1 to 5.

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