Pipeline circumferential weld stress reduction method and device and electronic equipment
By measuring the axial and annular coercive forces of the pipeline ring welds, and performing ultrasonic impact treatment when necessary, the problem of low stress reduction efficiency of pipeline ring welds is solved, and rapid and accurate stress reduction is achieved.
Patent Information
- Application Number
- CN202510577271.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-06
- Publication Date
- 2025-08-19
AI Technical Summary
In the prior art, the stress reduction efficiency of the pipeline ring weld is low, and the traditional detection method can damage the weld surface and be inefficient.
By measuring the axial and annular coercive forces on the pipe ring weld, the stress distribution in the area to be reduced is determined, and ultrasonic impact treatment is carried out when necessary to reduce stress.
It realizes rapid and accurate acquisition of stress distribution and stress relief under normal operation of the pipeline, improves stress relief efficiency, and avoids additional damage to the weld.
Smart Images
Figure CN120505503A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of pipeline technology, and in particular to a method, device and electronic equipment for reducing stress of pipeline girth welds. Background Art
[0002] Girth weld welding is one of the most critical processes in long-distance pipeline construction, and its quality directly impacts the pipeline's operational safety and service life. During the welding process, residual stress is generated in the weld and near-weld seams due to deformation constraints. Once the girth weld stress exceeds the ultimate stress, crack initiation and propagation will occur, compromising the pipeline's operational safety. Therefore, stress relief is necessary to reduce residual stress concentration in the weld and improve its stress-bearing capacity.
[0003] In related technologies, ultrasonic impact is used to reduce the residual stress of the pipeline girth weld. After the ultrasonic impact treatment is completed, the residual stress of the girth weld must be tested to determine whether the residual stress of the girth weld after ultrasonic impact meets the preset threshold. If it does not meet the threshold, it means that the stress reduction is unqualified and ultrasonic impact needs to be performed again.
[0004] When testing the residual stress of welds, the blind hole method is often used. A tiny blind hole is drilled on the surface of the girth weld, and the strain change before and after drilling is measured using strain gauges to calculate the residual stress value. This method will cause damage to the girth weld surface and is inefficient. Summary of the Invention
[0005] The purpose of this application is to provide a method, device and electronic equipment for stress reduction of pipeline girth welds, aiming to solve the problem of how to improve the efficiency of stress reduction of pipeline girth welds.
[0006] In a first aspect, a method for stress reduction of a pipeline girth weld is provided, comprising: determining the axial coercive force and the circumferential coercive force of a measuring point on the pipeline girth weld; determining a stress assessment result of a region to be reduced in the pipeline girth weld based on the axial coercive force and the circumferential coercive force; the stress assessment result is used to indicate whether the region to be reduced requires stress reduction; the region to be reduced includes a plurality of measuring points; and if the stress assessment result indicates that the region to be reduced requires stress reduction, performing ultrasonic impact treatment on the region to be reduced to reduce the stress in the region to be reduced.
[0007] The beneficial effects of the embodiments of the present application are as follows: When residual stress exists in the pipeline girth weld, the stress changes the resistance to magnetic domain wall movement, resulting in a corresponding change in the coercive force. By measuring the axial coercive force and circumferential coercive force at different locations, the residual stress distribution characteristics of the pipeline girth weld can be directly determined. Then, based on the stress assessment results of the area to be reduced in the pipeline girth weld, it is determined whether to reduce the stress in the area to be reduced. This method can quickly and accurately obtain the stress distribution in the area to be reduced and determine the stress assessment results. At the same time, the detection can be performed during normal pipeline operation without interrupting pipeline transportation, greatly improving the efficiency of stress reduction.
[0008] In some embodiments, the above method further includes: determining the groove width and groove depth of the area to be reduced after ultrasonic impact treatment; and determining the stress evaluation result of the area to be reduced after impact based on the groove width and groove depth.
[0009] In some embodiments, the above-mentioned determination of the stress assessment result of the area to be reduced after the impact based on the groove width and the groove depth includes: obtaining the axial coercive force and the circumferential coercive force of the measuring point in the area to be reduced after the ultrasonic impact when the groove width and the groove depth meet the preset size conditions; the preset size conditions are: when the groove width is greater than the preset width threshold and the groove depth is greater than the preset depth threshold; determining the stress assessment result of the area to be reduced after the impact based on the axial coercive force and the circumferential coercive force.
[0010] In some embodiments, the above method further includes: when the groove width and the groove depth do not meet the preset size conditions, returning to the step of performing ultrasonic impact treatment on the area to be reduced.
[0011] In some embodiments, the above method also includes: when the stress assessment result indicates that the area to be reduced does not need to reduce stress, verifying the pipeline girth weld to obtain a verification result, and the verification is used to determine whether the residual stress of the pipeline girth weld is less than the stress threshold of the pipeline girth weld.
[0012] In some embodiments, the above-mentioned determination of the stress assessment result of the area to be reduced of the pipeline girth weld based on the axial coercive force and the hoop coercive force includes: determining the stress of the area to be reduced based on the axial coercive force and the hoop coercive force; when the stress in the area to be reduced is greater than a preset stress threshold, determining that the stress assessment result indicates that the stress in the area to be reduced needs to be reduced.
[0013] In a second aspect, a stress reduction device for a pipeline girth weld is also provided, comprising: a determination unit for determining the axial coercive force and the circumferential coercive force of a measuring point on the pipeline girth weld; determining a stress assessment result of an area to be reduced of the pipeline girth weld based on the axial coercive force and the circumferential coercive force; the stress assessment result is used to indicate whether the area to be reduced needs to reduce stress; the area to be reduced includes a plurality of the measuring points; and a processing unit for performing ultrasonic impact treatment on the area to be reduced to reduce the stress in the area to be reduced when the stress assessment result indicates that the area to be reduced needs to reduce stress.
[0014] In some embodiments, the processing unit is further used to determine the groove width and groove depth of the area to be reduced after ultrasonic impact treatment; and determine the stress evaluation result of the area to be reduced after impact based on the groove width and groove depth.
[0015] In some embodiments, the above-mentioned processing unit is specifically used to obtain the axial coercive force and circumferential coercive force of the measurement point in the area to be reduced after ultrasonic impact when the groove width and the groove depth meet the preset size conditions; the preset size conditions are: when the groove width is greater than the preset width threshold, and the groove depth is greater than the preset depth threshold; based on the axial coercive force and the circumferential coercive force, determine the stress evaluation result of the area to be reduced after the impact.
[0016] In some embodiments, the processing unit is further configured to return to the step of performing ultrasonic impact treatment on the area to be reduced when the groove width and the groove depth do not meet the preset size conditions.
[0017] In some embodiments, the above-mentioned processing unit is also used to verify the pipeline girth weld when the stress assessment result indicates that the area to be reduced does not need to reduce stress, and obtain a verification result, which is used to determine whether the residual stress of the pipeline girth weld is less than the stress threshold of the pipeline girth weld.
[0018] In some embodiments, the second determination unit is specifically used to determine the stress of the area to be reduced based on the axial coercive force and the circumferential coercive force; when the stress of the area to be reduced is greater than a preset stress threshold, the stress assessment result is determined to be that the stress of the area to be reduced needs to be reduced.
[0019] In a third aspect, the present application provides an electronic device comprising: a processor and a memory configured to store processor-executable instructions; wherein the processor is configured to execute the instructions to implement any one of the optional stress relief methods for pipeline girth welds in the first aspect above.
[0020] In a fourth aspect, the present application provides a computer-readable storage medium having instructions stored thereon. When the instructions in the computer-readable storage medium are executed by a device, the device is enabled to execute any one of the optional stress relief methods for pipeline girth welds in the first aspect described above.
[0021] In a fifth aspect, the present application provides a computer program product comprising computer instructions, which, when executed on a processor of a device, enable the device to execute a stress relief method for a pipe girth weld, optionally as described in any one of the first aspects above. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0023] Figure 1 A schematic flow chart of a method for stress relief of a pipeline girth weld provided in an embodiment of the present application;
[0024] Figure 2 A flow chart for measuring coercive force provided in an embodiment of the present application;
[0025] Figure 3 A schematic flow chart of another method for stress relief of a pipe girth weld provided in an embodiment of the present application;
[0026] Figure 4 A schematic diagram of the relationship between stress and coercive force provided in an embodiment of the present application;
[0027] Figure 5 A schematic flow chart of another method for stress relief of a pipe girth weld provided in an embodiment of the present application;
[0028] Figure 6 A schematic structural diagram of a stress relief device for a pipe girth weld provided in an embodiment of the present application;
[0029] Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION
[0030] In the embodiments of the present application, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature specified as "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include one or more of the features.
[0031] In the embodiments of the present application, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.
[0032] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.
[0033] Girth weld welding is one of the most critical processes in long-distance pipeline construction, and its quality directly impacts the operational safety and service life of the pipeline. During the welding process, residual stress is generated in the weld and near-weld areas due to constrained deformation. The weld area is rapidly heated to high temperatures, causing the metal to expand. However, the surrounding parent metal has slow heat conduction, restricting the weld expansion. This, in turn, hinders the weld's contraction during cooling, resulting in residual stress. Compared to the parent metal, the rapid heating and cooling during welding causes abnormal crystallization, disrupting the originally uniform and fine-grained parent metal structure. The weld metal solidifies rapidly at high temperatures and cools extremely quickly, resulting in crystallization before the grains have time to fully refine, resulting in a coarse grain structure. The heat-affected zone (HAZ) undergoes varying degrees of phase transformation due to the welding thermal cycle, resulting in significant microstructural changes. This structural change directly weakens the mechanical properties of the weld and HAZ, such as strength, toughness, and fatigue resistance.
[0034] During pipeline operation, girth welds bear not only conventional loads such as internal medium pressure, pipeline weight, and soil pressure, but also additional stresses caused by factors such as temperature fluctuations and foundation settlement. These stresses, combined with welding residual stresses, can cause crack initiation and propagation if the stress in this area exceeds the ultimate stress, compromising the safety of the pipeline. Therefore, stress relief is necessary in areas where welding residual stress is concentrated to reduce stress concentration and improve the stress-bearing capacity of the weld.
[0035] In related technologies, ultrasonic impact uses a high-frequency vibrating impact head to repeatedly impact the weld surface with a certain pressure, causing plastic deformation of the weld metal. In this process, the residual tensile stress of the weld is released and converted into compressive stress, while also refining the grains and improving the microstructure of the weld and heat-affected zone, thereby significantly improving the mechanical properties of the girth weld. After completing the ultrasonic impact treatment, accurate detection of the residual stress in the girth weld is particularly critical. When detecting the residual stress of the weld, the blind hole method is often used. By manually drilling a tiny blind hole on the surface of the girth weld, a strain gauge is used to measure the strain change before and after drilling, and then the residual stress value is calculated. This method will cause damage to the girth weld surface and is inefficient.
[0036] Based on this, the present application proposes a method, device, and electronic equipment for stress reduction of a pipeline girth weld, including: determining the axial coercive force and circumferential coercive force of a measurement point on the pipeline girth weld; determining a stress assessment result of the area to be reduced in the pipeline girth weld based on the axial coercive force and circumferential coercive force; the stress assessment result is used to indicate whether the area to be reduced needs stress reduction; the area to be reduced includes multiple measurement points; if the stress assessment result indicates that the area to be reduced needs stress reduction, ultrasonic impact treatment is performed on the area to be reduced to reduce the stress in the area to be reduced. When residual stress exists in the pipeline girth weld, the stress will change the resistance to movement of the magnetic domain wall, resulting in a corresponding change in the coercive force. By measuring the axial coercive force and circumferential coercive force at different positions, the residual stress distribution characteristics of the pipeline girth weld can be directly determined. Then, based on the stress assessment results of the area to be reduced in the pipeline girth weld, it is determined whether to reduce the stress in the area to be reduced. This method can quickly and accurately obtain the stress distribution in the area to be reduced and determine the stress assessment results. At the same time, the detection can be carried out under the normal operating state of the pipeline without interrupting pipeline transportation, which greatly improves the efficiency of stress reduction.
[0037] The following describes the stress reduction method, device and electronic equipment for pipeline girth welds proposed in this application in conjunction with the accompanying drawings.
[0038] In some embodiments, long-distance natural gas pipelines are subjected to high pressure for extended periods, subjecting girth welds to complex stresses. Regular pipeline maintenance requires stress reduction and evaluation of girth welds. The present invention determines the stress assessment results by determining the axial and circumferential coercivity of the area to be reduced. Once an area requiring stress reduction is identified, timely ultrasonic impact treatment can effectively reduce the risk of pipeline leakage and rupture due to stress, ensuring safe and stable natural gas transportation and avoiding gas supply interruptions and safety incidents caused by pipeline failures.
[0039] It should be noted that the executor of the stress reduction method for pipeline girth welds of the present application can be a server, where the server can be a server cluster composed of multiple servers, or a single server, or a computer, or a processor or processing chip in a server or computer, or any other device or equipment with a stress reduction function for pipeline girth welds. The embodiments of the present application do not limit this.
[0040] like Figure 1 As shown, the stress relief method of the pipeline girth weld of the present application includes the following steps:
[0041] S101. Determine the axial coercive force and the circumferential coercive force of a measuring point on a girth weld of a pipeline.
[0042] Coercive force refers to the reverse magnetic field strength required to reduce the magnetization of a magnetic material to zero after it has been magnetized to saturation. Axial coercive force is the reverse magnetic field strength along the length of the pipe, while hoop coercive force is the reverse magnetic field strength in the circumferential direction (i.e., around the circumference of the pipe).
[0043] As a possible implementation method, measurement points are arranged along the girth weld of the pipeline according to a specific pattern. This is typically done in a grid pattern, with measurement points set at regular angles (e.g., 15°) along the circumference and rows of measurement points spaced at regular intervals (e.g., 50 mm) along the axial direction. For critical locations along the girth weld, such as the weld center and the junction between the heat-affected zone and the weld, measurement points can be appropriately increased to ensure comprehensive and accurate stress distribution information.
[0044] In one possible implementation, the starting point of the pipeline girth weld is determined to be 0:00. The girth weld is then marked at 12 o'clock positions on a clock face, with a mark made every 30 minutes, such as 0:00, 12:30, 1:00, and 1:30. The measurement point is determined with the weld at the marked position as the center. One marked position can correspond to multiple measurement points, and the distance between each measurement point and the marked point can be different.
[0045] The axial coercive force and the hoop coercive force can be determined by a coercive force measuring instrument, which will not be described in detail here.
[0046] like Figure 2 As shown in Figure 2, the coercivity measurement process includes:
[0047] Prepare test conditions: First, prepare all the conditions required for measurement.
[0048] Select a measurement solution: Determine the appropriate measurement solution based on the specific coercivity measurement requirements.
[0049] Sample parameter settings: Specimen number: Number the specimens used for testing for easy identification and recording. Magnetic circuit length: Set the length parameter of the magnetic circuit. Width: Set the width of the test component. Height: Set the height of the test component.
[0050] Test parameter settings: Excitation Maximum: Set the maximum excitation value. Corner Magnetic Field: Determine the magnetic field value at the corner. B Range: Set the range of magnetic induction intensity (B). Coil Turns: Determine the number of coil turns.
[0051] Zeroing, B zeroing: Perform zeroing operation on the measuring equipment and perform zero calibration on the magnetic induction intensity (B) to ensure measurement accuracy.
[0052] Measuring remanence and coercivity: After the equipment is zeroed, start measuring the remanence and coercivity of the specimen.
[0053] Read measurement data: After the measurement is completed, read and record the measurement data of remanence and coercivity.
[0054] S102. Determine a stress assessment result of a region to be reduced in the pipeline girth weld according to the axial coercive force and the circumferential coercive force.
[0055] The stress assessment results are used to indicate whether the stress in the area to be reduced needs to be reduced.
[0056] As a possible implementation method, the stress of the area to be reduced is determined based on the axial coercive force and the hoop coercive force. When the stress in the area to be reduced is greater than a preset stress threshold, the stress assessment result is determined to indicate that the stress in the area to be reduced needs to be reduced.
[0057] In one possible implementation, the stress of the area to be reduced is determined based on the axial coercive force and the hoop coercive force, and the stress value is compared with a preset stress threshold. If the stress value is less than or equal to the preset stress threshold, the stress assessment result is that stress reduction is not required; if the stress value is greater than the preset stress threshold, the stress assessment result is that stress reduction is required.
[0058] In one possible implementation, the coercive force at a certain measuring point can be determined based on the axial coercive force and the circumferential coercive force at that measuring point. Then, through experiments or theoretical analysis, a corresponding relationship between the coercive force and the stress of the pipeline can be established. Based on the coercive force and the corresponding relationship between the coercive force and the stress, the stress at the measuring point can be determined.
[0059] The correspondence between coercive force and stress is represented by a preset correspondence between coercive force and stress; or, the fourth preset relationship is the correspondence between the preset coercive force interval and stress, and this relationship can be based on physical principles or obtained by fitting a large amount of experimental data.
[0060] In some embodiments, the area to be reduced includes multiple measurement points; the stress values of the multiple measurement points and the positions of the measurement points in the pipeline girth weld can be used to determine the stress cloud map or contour map of the area to be reduced to determine the stress of the area to be reduced.
[0061] It should be understood that in the stress detection of pipeline girth welds, the characteristic that the coercive force of ferromagnetic materials changes with stress is utilized. By measuring the coercive force, the residual stress distribution of the pipeline girth weld can be indirectly determined, thereby evaluating the safety of the pipeline.
[0062] S103 . When the stress assessment result indicates that the stress in the area to be reduced needs to be reduced, perform ultrasonic impact treatment on the area to be reduced to reduce the stress in the area to be reduced.
[0063] As a possible implementation method, ultrasonic impact equipment is used to carry out ultrasonic impact stress reduction treatment on different measuring points of the girth weld. During the ultrasonic impact process, the parameters that need to be controlled are amplitude, number of impact needles and processing speed. The size of the parameters can be determined according to the pipe size and pipe material.
[0064] Pipe dimensions include diameter and wall thickness. For small-diameter pipes (e.g., less than 200mm), the girth weld area is relatively small, resulting in a relatively concentrated stress distribution. In this case, a smaller amplitude is recommended to reduce the energy of a single impact and avoid damage to the pipe wall due to excessive energy. A smaller number of impact needles is also recommended to ensure uniform treatment of the weld. For large-diameter pipes (e.g., greater than 800mm), the girth weld area is large. To improve treatment efficiency, the ultrasonic amplitude can be increased to enhance the impact effect. Increasing the number of impact needles can also expand the treatment range, and the treatment speed can also be appropriately increased.
[0065] Wall thickness factor: Thin-walled pipes (e.g., less than 8mm thick) have relatively low structural strength and limited impact resistance. Smaller amplitudes and fewer impact pins should be used to prevent pipe deformation from excessive impact. Thick-walled pipes (e.g., greater than 20mm thick) can withstand greater impact energy and can be treated with larger amplitudes and more impact pins, with correspondingly higher processing speeds, ensuring that stress can penetrate deeply into the material for effective reduction.
[0066] Before ultrasonic blasting, the area to be reduced must be marked. This allows for a clearer assessment of the coverage of the ultrasonic blast during the treatment process. By observing whether the marked areas have been treated with ultrasonic blasting, you can ensure that the entire area requiring stress reduction has been effectively treated, avoiding omissions.
[0067] After the ultrasonic impact treatment is completed, the surface quality of the girth weld needs to be checked to see if there is any surface damage caused by the impact (such as scratches, pits, etc.). If the surface quality does not meet the requirements, it is necessary to repair it according to the specific situation or adjust the parameters and repeat the ultrasonic impact treatment.
[0068] In some embodiments, when the stress assessment result indicates that the area to be reduced does not need stress reduction, the pipeline girth weld is verified to obtain a verification result, which is used to determine whether the residual stress of the pipeline girth weld is less than the stress threshold of the pipeline girth weld.
[0069] As a possible implementation method, the pipeline girth weld can be verified by combining geometric modeling to determine whether the residual stress of the pipeline girth weld is less than the stress threshold of the pipeline girth weld. The following steps are included:
[0070] (1) Perform geometric modeling: Based on the actual size of the pipeline girth weld, use the three-dimensional modeling tool in ABAQUS to create a pipeline model and set the pipe diameter, wall thickness, and groove shape and size of the girth weld.
[0071] (2) Simulate the welding process to obtain a distribution cloud diagram of the stress field, analyze the distribution of welding residual stress, and obtain the initial stress after welding.
[0072] (3) Based on the parameters of the ultrasonic impact treatment, the ultrasonic impact is simplified into a series of dynamic loads. The ultrasonic impact load is applied to the specified area of the girth weld to simulate the contact and interaction between the impact needle and the weld surface. After the impact is completed, the changes in the stress field during the ultrasonic impact process are observed, including the dynamic changes in the magnitude, direction, and distribution of the stress.
[0073] (4) Comparative analysis: draw the initial stress cloud map after welding, the stress cloud map after ultrasonic impact, and the residual stress cloud map after loading and unloading, and compare the extracted stress value with the stress value previously calculated by measuring the coercive force and using the corresponding formula. Analyze the difference between the two, calculate the error range, and evaluate the accuracy of using coercive force to evaluate the stress reduction effect of ultrasonic impact. If the error is within an acceptable range, it means that the coercive force method can effectively evaluate the stress reduction effect of ultrasonic impact; if the error is large, it is necessary to further analyze the cause, readjust the model parameters, or optimize the relationship formula between coercive force and stress.
[0074] Therefore, when residual stress exists in a pipeline girth weld, the stress changes the resistance to magnetic domain wall movement, resulting in a corresponding change in the coercive force. By measuring the axial and circumferential coercive forces at different locations, the residual stress distribution characteristics of the pipeline girth weld can be directly determined. The stress assessment results of the area to be reduced in the pipeline girth weld are then used to determine whether to perform stress reduction in the area to be reduced. This method can quickly and accurately obtain the stress distribution in the area to be reduced and determine the stress assessment results. Furthermore, the test can be performed during normal pipeline operation without interrupting pipeline transportation, greatly improving the efficiency of stress reduction.
[0075] In some embodiments, as Figure 3 As shown, after the ultrasonic impact, it is necessary to determine whether the stress of the area to be tested after the ultrasonic impact is qualified, so the above method also includes:
[0076] S301 , determining the groove width and groove depth of the area to be reduced after ultrasonic impact treatment.
[0077] As a possible implementation method, the groove width and depth can be directly measured. For larger areas with relatively low precision requirements, the groove width and depth can be directly measured with a caliper. For areas with higher precision requirements, a profilometer can be used to scan the groove profile and accurately measure the height variation at different locations, thereby obtaining the groove width and depth data.
[0078] As another possible implementation, for smaller grooves, use an optical microscope to observe the grooves. Place the area to be ablated on the microscope stage and adjust the microscope's focus and magnification until the image of the groove is clearly displayed in the eyepiece or on a monitor. Use the microscope's built-in measuring scale or image analysis software to measure the groove's width and depth. Alternatively, a laser micrometer can be used to measure the object's dimensions by emitting a laser beam at the surface to be measured and using the reflected or scattered laser light.
[0079] As another possible implementation, groove width and depth can be determined through three-dimensional reconstruction of the area to be reduced. This involves performing multi-angle X-ray scans of the area to be reduced, acquiring a large amount of cross-sectional image data. These cross-sectional images are then reconstructed in three dimensions to create a complete three-dimensional model of the area to be reduced, allowing for precise measurement of groove width, depth, and other relevant dimensional information.
[0080] Alternatively, laser pulses can be emitted to the surface of the area to be ablated and the time it takes for the laser to reflect off can be measured to obtain the 3D coordinates of the surface. Scanning the area to be ablated generates 3D point cloud data containing the grooves. This point cloud data is processed and analyzed to construct a 3D model, allowing the width and depth of the grooves to be measured.
[0081] S302: Determine a stress assessment result of the area to be reduced after the impact according to the groove width and the groove depth.
[0082] As one possible implementation, when the groove width and groove depth meet preset dimensional conditions, the axial coercivity and hoop coercivity of the measurement points within the area to be reduced after ultrasonic impact are obtained. Based on the axial coercivity and hoop coercivity, the stress assessment result of the area to be reduced after impact is determined. The preset dimensional conditions are: the groove width is greater than a preset width threshold, and the groove depth is greater than a preset depth threshold.
[0083] As another possible implementation, when the groove width and the groove depth do not meet the preset size conditions, the process returns to the step of performing ultrasonic impact treatment on the area to be reduced.
[0084] In one possible implementation, the acquired groove width and depth values are compared with preset width and depth thresholds. A determination is made as to whether the groove width is greater than the preset width threshold, and the groove depth is greater than the preset depth threshold. If not, the area to be reduced is re-applied with ultrasonic impact to determine whether the preset dimensional conditions are met. If so, the stress in the area to be reduced is re-measured based on the coercive force to determine whether the stress meets the preset requirements.
[0085] The process of obtaining the axial coercive force and the hoop coercive force of the area to be reduced after impact can refer to the description in the above embodiment, which will not be repeated here.
[0086] In one possible implementation, the stress of the area to be reduced is determined based on the axial coercive force and the hoop coercive force, and the stress value is compared with a preset stress threshold. If the stress value is less than or equal to the preset stress threshold, the stress assessment result is that stress reduction is not required; if the stress value is greater than the preset stress threshold, the stress assessment result is that stress reduction is required.
[0087] The stress in the area to be relieved can be determined according to the following formula:
[0088]
[0089] Where σ is the stress value, H c is the measured coercive force value, is the coercive force value in the stress-free state, and K is the stress coefficient.
[0090] For example, Figure 4 As shown, the relationship between the coercive force and stress of the parent material under uniaxial stress can be expressed as Figure 4 As shown in (a), the relationship between the coercive force and stress can be expressed as follows: Figure 4 As shown in (b).
[0091] Therefore, by obtaining the groove width and groove depth of the area to be reduced after ultrasonic impact treatment, the stress evaluation result of the area to be reduced after the impact is determined according to the groove width and groove depth, thereby realizing the stress evaluation of the area to be detected after the ultrasonic impact, and determining whether it is qualified. If it is unqualified, the ultrasonic impact is repeated until the requirements are met, thereby ensuring the stress reduction effect.
[0092] like Figure 5 As shown, the present application also provides a method for reducing stress of a pipeline girth weld, comprising the following steps:
[0093] S501: Obtain the coercive force of the measurement point.
[0094] As a possible implementation method, the axial coercive force and the hoop coercive force of the measurement point are obtained.
[0095] S502: Check whether the coercive force reaches a preset threshold. If yes, execute S503; if not, execute S504.
[0096] As one possible implementation, the coercive force at the measurement point is determined based on the axial coercive force and the hoop coercive force at the measurement point. A preset threshold is determined based on the correspondence between coercive force and stress and a preset stress threshold. The measured coercive force is compared with the preset threshold. If the coercive force is less than the preset threshold, step S503 is executed; if not, step S504 is executed.
[0097] S503: Perform ultrasonic impact on the measuring point.
[0098] S504. The point to be measured is not a dangerous point and does not require stress relief.
[0099] S505: Determine whether the ultrasonic impact effect is qualified. If yes, execute S506; if not, execute S503.
[0100] As a possible implementation method, the groove width and groove depth of the area to be reduced after ultrasonic impact treatment are determined, and the stress evaluation result of the area to be reduced after impact is determined based on the groove width and groove depth.
[0101] When the groove width and the groove depth meet the preset size conditions, the ultrasonic impact effect is determined to be qualified; when the groove width and the groove depth do not meet the preset size conditions, the ultrasonic impact effect is determined to be unqualified.
[0102] S506: retest the coercivity.
[0103] S507: Check whether the coercive force reaches a preset threshold. If not, execute S508; if yes, execute S503.
[0104] As one possible implementation, the coercive force at the measurement point is determined based on the axial coercive force and the hoop coercive force at the measurement point after impact. A preset threshold is determined based on the correspondence between coercive force and stress and a preset stress threshold. The measured coercive force is compared with the preset threshold. If the coercive force is less than the preset threshold, S508 is executed; if not, S504 is executed.
[0105] S508: Reduction completed.
[0106] The above mainly introduces the solution provided by the embodiment of the present application from the perspective of the method. In order to achieve the above functions, the stress relief device of the pipeline girth weld includes a hardware structure and / or software module corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.
[0107] In the embodiment of the present application, the stress relief device for the pipe girth weld can be divided into functional modules according to the above method. For example, the stress relief device for the pipe girth weld can include functional modules corresponding to the functional divisions, or two or more functions can be integrated into one processing module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical functional division. In actual implementation, other division methods may be used.
[0108] Figure 6 This is a schematic diagram of the structure of a stress relief device for a pipe girth weld provided in an embodiment of the present application. Figure 6 The pipeline girth weld stress relief device 600 includes: a determination unit 610 and a processing unit 620.
[0109] A determination unit is used to determine the axial coercive force and the circumferential coercive force of the measuring point on the pipeline girth weld, and determine the stress assessment result of the area to be reduced in the pipeline girth weld based on the axial coercive force and the circumferential coercive force; the stress assessment result is used to indicate whether the area to be reduced needs to reduce stress; the area to be reduced includes multiple measuring points; and a processing unit is used to perform ultrasonic impact treatment on the area to be reduced to reduce the stress in the area to be reduced when the stress assessment result indicates that the area to be reduced needs to reduce stress.
[0110] In some embodiments, the processing unit 620 is further configured to determine the groove width and groove depth of the area to be reduced after ultrasonic impact treatment; and determine the stress evaluation result of the area to be reduced after impact based on the groove width and groove depth.
[0111] In some embodiments, the above-mentioned processing unit 620 is specifically used to obtain the axial coercive force and circumferential coercive force of the measurement point in the area to be reduced after the ultrasonic impact when the groove width and the groove depth meet the preset size conditions; the preset size conditions are: when the groove width is greater than the preset width threshold, and the groove depth is greater than the preset depth threshold; based on the axial coercive force and the circumferential coercive force, determine the stress evaluation result of the area to be reduced after the impact.
[0112] In some embodiments, the processing unit 620 is further configured to return to the step of performing ultrasonic impact treatment on the area to be reduced when the groove width and the groove depth do not meet the preset size conditions.
[0113] In some embodiments, the processing unit 620 is further used to verify the pipeline girth weld when the stress assessment result indicates that the area to be reduced does not need to reduce stress, and obtain a verification result, which is used to determine whether the residual stress of the pipeline girth weld is less than the stress threshold of the pipeline girth weld.
[0114] In some embodiments, the above-mentioned determination unit 610 is specifically used to determine the stress of the area to be reduced based on the axial coercive force and the circumferential coercive force; when the stress of the area to be reduced is greater than a preset stress threshold, the stress assessment result is determined to be that the stress of the area to be reduced needs to be reduced.
[0115] Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 7 As shown, the electronic device 700 includes but is not limited to: a processor 701 and a memory 702.
[0116] The memory 702 is used to store executable instructions of the processor 701. It is understandable that the processor 701 is configured to execute instructions to implement the stress relief method for the pipeline girth weld in the above embodiment.
[0117] It should be noted that those skilled in the art can understand that Figure 7 The electronic device structure shown in the figure does not limit the electronic device, and the electronic device may include Figure 7 More or fewer components may be shown, or certain components may be combined, or the components may be arranged differently.
[0118] The processor 701 is the control center of the electronic device. It connects the various parts of the entire electronic device using various interfaces and lines. By running or executing software programs and / or modules stored in the memory 702 and calling data stored in the memory 702, it performs various functions of the electronic device and processes data, thereby monitoring the electronic device as a whole. The processor 701 may include one or more processing units. Optionally, the processor 701 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly handles wireless communications. It is understood that the above-mentioned modem processor may not be integrated into the processor 701.
[0119] The memory 702 can be used to store software programs and various data. The memory 702 may primarily include a program storage area and a data storage area. The program storage area may store an operating system and application programs required by at least one functional module (such as a determination unit, a processing unit, etc.). Furthermore, the memory 702 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage device.
[0120] In an exemplary embodiment, a computer-readable storage medium including instructions is further provided, such as a memory 702 including instructions. The instructions may be executed by the processor 701 of the electronic device 700 to implement the method in the above embodiment.
[0121] In actual implementation, Figure 6 The determining unit 610 and the processing unit 620 in the embodiment can both be Figure 7 The processor 701 in the embodiment calls the computer program stored in the memory 702. The specific execution process can be referred to the description of the method part in the above embodiment, which will not be repeated here.
[0122] Optionally, the computer-readable storage medium may be a non-temporary computer-readable storage medium, for example, the non-temporary computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.
[0123] In an exemplary embodiment, the present application also provides a computer program product including one or more instructions, which can be executed by the processor 701 of the electronic device to implement the method in the above embodiment.
[0124] It should be noted that when the instructions in the above-mentioned computer-readable storage medium or one or more instructions in the computer program product are executed by the processor of the electronic device, the various processes of the above-mentioned method embodiment are implemented and the same technical effect as the above-mentioned method can be achieved. To avoid repetition, they will not be repeated here.
[0125] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete the full classification or partial functions described above.
[0126] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.
[0127] The units described as separate components may or may not be physically separate, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.
[0128] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.
[0129] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or the full classification part or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) to execute the full classification part or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks or optical disks.
[0130] In the description of the embodiments of the present application, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.
[0131] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.
Claims
1. A method for reducing stress of a pipeline girth weld, characterized in that: include: Determine the axial coercivity and hoop coercivity at the measuring point on the pipeline girth weld; Determining a stress assessment result of a region to be reduced in the girth weld of the pipeline based on the axial coercive force and the circumferential coercive force; the stress assessment result is used to indicate whether the region to be reduced needs stress relief; the region to be reduced includes a plurality of the measurement points; When the stress assessment result indicates that the area to be reduced needs to reduce stress, ultrasonic impact treatment is performed on the area to be reduced to reduce the stress in the area to be reduced.
2. The method according to claim 1, characterized in that The method further comprises: Determining the groove width and groove depth of the area to be reduced after ultrasonic impact treatment; A stress evaluation result of the area to be relieved after the impact is determined according to the groove width and the groove depth.
3. The method according to claim 2, characterized in that The determining of the stress assessment result of the area to be reduced after the impact based on the groove width and the groove depth includes: Obtaining the axial coercive force and the hoop coercive force of the measurement point in the area to be reduced after the ultrasonic impact when the groove width and the groove depth meet preset size conditions; the preset size conditions are: the groove width is greater than a preset width threshold, and the groove depth is greater than a preset depth threshold; A stress evaluation result of the area to be relieved after the impact is determined according to the axial coercive force and the hoop coercive force.
4. The method according to claim 3, characterized in that The method further comprises: In the case that the groove width and the groove depth do not meet the preset size conditions, the process returns to the step of performing ultrasonic impact treatment on the area to be reduced.
5. The method according to any one of claims 1 to 3, characterized in that The method further comprises: When the stress assessment result indicates that the area to be reduced does not need stress relief, the pipeline girth weld is verified to obtain a verification result, wherein the verification is used to determine whether the residual stress of the pipeline girth weld is less than a stress threshold of the pipeline girth weld.
6. The method according to claim 1, characterized in that Determining the stress assessment result of the to-be-relieved area of the pipeline girth weld according to the axial coercive force and the hoop coercive force includes: determining the stress of the area to be reduced according to the axial coercive force and the hoop coercive force; When the stress in the area to be reduced is greater than a preset stress threshold, it is determined that the stress assessment result indicates that the area to be reduced needs to reduce stress.
7. A stress relief device for a pipeline girth weld, characterized in that: include: a determination unit, configured to determine the axial coercive force and the hoop coercive force of a measuring point on a pipe girth weld; determine a stress assessment result of a to-be-reduced region of the pipe girth weld based on the axial coercive force and the hoop coercive force; the stress assessment result is used to indicate whether the to-be-reduced region requires stress relief; the to-be-reduced region includes a plurality of the measuring points; A processing unit is configured to perform ultrasonic impact treatment on the area to be reduced, so as to reduce the stress in the area to be reduced, when the stress assessment result indicates that the area to be reduced needs to reduce stress.
8. An electronic device, characterized in that: include: a processor and a memory for storing instructions executable by the processor; The processor is configured to execute the instructions to implement the method according to any one of claims 1 to 6.
9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and when the computer instructions are executed on a computer, the computer is caused to perform the method according to any one of claims 1 to 6.
10. A computer program product, characterized in that The computer program product comprises computer instructions, and when the computer instructions are run on an electronic device, the electronic device is caused to perform the method according to any one of claims 1 to 6.