CN109783921B - Heat-affected zone assessment method, device and computer equipment for oil and gas pipelines - Google Patents

Abstract

The invention discloses a heat-affected zone evaluation method, device and computer equipment of an oil and gas transmission pipeline, wherein the method includes: obtaining the pipeline thickness t of the oil and gas transmission pipeline, and the predicted weld seam cover width We and root weld of the oil and gas transmission pipeline Width Wr; input the pipe thickness t, weld cover width We and root weld width Wr into the heat affected zone evaluation model to determine the constraints on the heat affected zone width h of the oil and gas pipeline, where the heat affected zone evaluation model is based on h <t-(We-Wr)/2 and t-(We-Wr)/2>0 get the constraint condition of heat-affected zone width h; output the constraint condition of heat-affected zone width h obtained from the heat-affected zone evaluation model. Through the present disclosure, the rapid assessment of heat-affected zone requirements according to the pipe thickness and weld section characteristics of the pipe is realized.

Description

Heat-affected zone assessment method, device and computer equipment for oil and gas pipelines

technical field

The invention relates to the technical field of oil and gas transportation pipeline welding, in particular to a method, device and computer equipment for evaluating a heat-affected zone of an oil and gas transportation pipeline.

Background technique

In the related art, during the welding process of the pipeline girth weld, it is often found that the girth weld heat-affected zone softens, especially for large deformation steel, this phenomenon is more obvious. Due to the high risk of long-distance oil and gas pipelines, the safety requirements are particularly strict, and the softening of the heat-affected zone of the girth weld is an unfavorable factor for the girth weld, which needs to be avoided by effective means. In order to prevent fracture at the girth weld position during pipeline stretching, it is necessary to control the softening of the heat-affected zone of the girth weld.

Contents of the invention

The purpose of the present invention is to provide a heat-affected zone assessment method, device and computer equipment for oil and gas pipelines, which are used to solve the technical problem of how to simply assess the heat-affected zone (HAZ) of girth welds in the related art.

In one aspect of the present invention, a method for evaluating the heat-affected zone of oil and gas transportation pipelines is provided, which realizes the constraints of evaluating the width of the heat-affected zone of oil and gas transportation pipelines based on the thickness of the pipeline, the expected width of the weld cap and the width of the root weld conditions, the method includes: obtaining the pipeline thickness t of the oil and gas transmission pipeline, and the expected weld cap width We and the root weld width Wr of the oil and gas transmission pipeline; the pipeline thickness t, the weld cap width We and the root weld width Wr; The welding width Wr is input into the heat-affected zone evaluation model to determine the constraint conditions of the heat-affected zone width h of the oil and gas pipeline, wherein the heat-affected zone evaluation model follows h<t-(We-Wr)/2 and t-( We-Wr)/2>0 to obtain the constraint condition of the heat affected zone width h; output the constraint condition of the heat affected zone width h obtained from the heat affected zone evaluation model.

In another aspect of the present invention, a method for evaluating the performance of an oil and gas transmission pipeline is provided. The method realizes whether the oil and gas transmission pipeline meets the performance requirements according to the thickness of the pipeline, the width of the weld cover and the width of the root weld. The performance requirements include The softening performance of the heat-affected zone of the weld, which includes: detecting the pipeline thickness t, the weld cover width We, the root weld width Wr, and the heat-affected zone width h of the oil and gas transmission pipeline; the pipeline thickness t, the weld cover width We, The root weld width Wr and the heat-affected zone width h are input into the heat-affected zone evaluation model to judge whether the heat-affected zone width h of the oil and gas pipeline satisfies the constraints, where the constraints are h<t-(We-Wr)/ 2 and t-(We-Wr)/2>0; when the heat-affected zone width h<t-(We-Wr)/2 and t-(We-Wr)/2>0, determine the oil and gas pipeline The welding meets the performance requirements.

In another aspect of the present invention, a method for determining the welding process of an oil and gas transmission pipeline is provided, the method realizes the determination of the welding process of the oil and gas transmission pipeline according to the thickness of the pipeline, the expected weld cover width and the root weld width, the method Including: Obtain the pipeline thickness t of the oil and gas transmission pipeline, and the expected weld cover width We and root weld width Wr of the oil and gas transmission pipeline; input the pipeline thickness t, weld cover width We and root weld width Wr into the heat affected zone evaluation model to determine the constraint conditions of the heat-affected zone width h of the oil and gas pipeline, where the heat-affected zone evaluation model obtains the heat Constraints on the width of the affected zone h; based on the corresponding relationship between the constraints on the width of the heat-affected zone h and the welding process information, determine the welding process information when the oil and gas pipeline meets the constraints on the width of the heat-affected zone h, where the welding process information includes The welding method and the process parameters corresponding to the welding method.

In yet another aspect of the present invention, a heat-affected zone evaluation device for oil and gas transmission pipelines is provided, including: an acquisition module, used to obtain the pipeline thickness t of the oil and gas transmission pipeline, and the expected weld cover width We of the oil and gas transmission pipeline and root weld width Wr; a determination module, which is used to input the pipe thickness t, weld cover width We and root weld width Wr into the heat-affected zone evaluation model to determine the constraint conditions of the heat-affected zone width h of the oil and gas pipeline, where , the heat-affected zone evaluation model obtains the constraints of the heat-affected zone width h according to h<t-(We-Wr)/2 and t-(We-Wr)/2>0; the output module is used to output the heat-affected zone evaluation Constraints for the width h of the heat-affected zone obtained by the model.

In yet another aspect of the present invention, a performance evaluation device for oil and gas transmission pipelines is provided, including: a detection module, which is used to detect the pipeline thickness t, weld cover width We, root weld width Wr and thermal influence of the oil and gas transmission pipeline. zone width h; a judging module, which is used to input the pipe thickness t, weld cover width We, root weld width Wr and heat-affected zone width h into the heat-affected zone evaluation model to judge whether the heat-affected zone width h of the oil and gas transmission pipeline is Satisfy the constraints, where the constraints are h<t-(We-Wr)/2 and t-(We-Wr)/2>0; the determination module is used when the heat-affected zone width h<t-(We- Wr)/2 and t-(We-Wr)/2>0, it is determined that the welding of oil and gas pipelines meets the performance requirements.

In yet another aspect of the present invention, a device for determining the welding process of an oil and gas transmission pipeline is provided, including: an acquisition module for acquiring the pipeline thickness t of the oil and gas transmission pipeline, and the predicted weld cover width We and Root weld width Wr; the first determination module is used to input the pipe thickness t, weld cover width We and root weld width Wr into the heat-affected zone evaluation model to determine the constraints on the heat-affected zone width h of the oil and gas pipeline, Among them, the heat-affected zone evaluation model obtains the constraints of the heat-affected zone width h according to h<t-(We-Wr)/2 and t-(We-Wr)/2>0; the second determination module is used to The corresponding relationship between the constraint conditions of the width of the affected zone h and the welding process information, determine the welding process information when the oil and gas pipeline meets the constraints of the heat-affected zone width h, where the welding process information includes the welding method and the corresponding process parameters of the welding method .

In yet another aspect of the present invention, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and operable on the processor. When the processor executes the computer program, the steps of any of the above-mentioned methods are implemented. Or the steps of any of the above devices.

Without limitation, the above-mentioned method and device can be applied to pipelines with X70 or X80 type pipeline steel plates to evaluate girth welds prepared by manual welding (SMAW) and semi-automatic welding (FCAW-S). It is especially suitable for evaluating oil and gas transmission pipelines with high steel grade, large diameter and high pressure.

According to the theory of material mechanics, the weakest direction of ductile material deformation is the 45° shear stress direction, and the fracture and strain concentration of the material appear in the 45° shear direction (also known as the shear band). The inventors found that the deformation of the girth weld follows the 45° shear band theory, and based on this theory, an evaluation module for the heat-affected zone was designed. Specifically, the heat-affected zone evaluation model of the present disclosure obtains the constraint condition of the heat-affected zone width h according to h<t-(We-Wr)/2 and t-(We-Wr)/2>0. Under this constraint condition, when deformation occurs under the condition of external axial load, the 45° shear band of the girth weld deformation falls outside the range of the heat-affected zone, which avoids the occurrence of girth weld deformation when the girth weld deformation is concentrated in the range of the heat-affected zone Near seam fracture. At the same time, for the pipe thickness t, the weld cap width We and the root weld width need to satisfy t-(We-Wr)/2>0.

Through the technical scheme provided by the present invention, it is convenient to quickly judge whether there will be fracture behavior near the girth weld according to the weld section characteristics (weld cover width We and root weld width), and optimize the weld section size and welding process , Effectively guarantee the service safety of welds.

Description of drawings

Figure 1 is a schematic diagram of a pipeline meeting constraints according to the present invention;

Figure 2 is a schematic diagram of a pipeline that does not meet the constraint conditions according to the present invention;

Fig. 3 is a flowchart of a method for evaluating a heat-affected zone of an oil and gas transportation pipeline according to an embodiment of the present invention;

Fig. 4 is a structural block diagram of an evaluation device for a heat-affected zone of an oil and gas transportation pipeline according to an embodiment of the present invention;

5 is a flow chart of a method for evaluating the performance of an oil and gas pipeline according to an embodiment of the present invention;

Fig. 6 is a structural block diagram of a performance evaluation device for an oil and gas pipeline according to an embodiment of the present invention;

Fig. 7 is a flowchart of a method for determining a welding process of an oil and gas transportation pipeline according to an embodiment of the present invention;

Fig. 8 is a structural block diagram of an apparatus for determining a welding process of an oil and gas pipeline according to an embodiment of the present invention; and

FIG. 9 is a schematic diagram of a computer device according to an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

According to the theory of material mechanics, the weakest direction of ductile material deformation is the 45° shear stress direction, and the fracture and strain concentration of the material appear in the 45° shear direction (also known as the shear band). The inventors of the present disclosure found that the deformation of the girth weld follows the 45° shear band theory, and based on this theory, designed a heat-affected zone evaluation module.

Without limitation, the heat-affected zone evaluation model of the present disclosure obtains the constraint condition of the heat-affected zone width h according to h<t-(We-Wr)/2 and t-(We-Wr)/2>0. Referring to Figure 1, when the constraints are satisfied, when deformation occurs under the condition of external axial load, the 45° shear band of the girth weld deformation falls outside the range of the heat-affected zone, which avoids the concentration of the girth weld deformation in the range of the heat-affected zone Seam-near fracture occurs in the girth weld. Referring to Fig. 2, when the constraint condition is not satisfied, when the deformation occurs under the condition of adding axial load, the 45° shear band of the girth weld deformation falls within the range of the heat-affected zone, and the girth weld deformation is concentrated in the range of the heat-affected zone. Girth welds are prone to near-seam fractures.

The present disclosure provides a method for evaluating the heat-affected zone of an oil-gas transportation pipeline, which realizes the constraint condition of evaluating the width of the heat-affected zone of the oil-gas transportation pipeline according to the thickness of the pipeline, the expected width of the weld cover and the width of the root weld.

Fig. 3 is a flowchart of a method for evaluating a heat-affected zone of an oil and gas transportation pipeline according to an embodiment of the present invention. As shown in Fig. 3 , the method includes steps S302 to S306.

Step S302, obtaining the pipeline thickness t of the oil and gas transmission pipeline, and the expected weld cap width We and root weld width Wr of the oil and gas transmission pipeline.

Step S304, input the pipe thickness t, the weld cap width We and the root weld width Wr into the heat-affected zone evaluation model to determine the constraints on the heat-affected zone width h of the oil and gas pipeline, wherein the heat-affected The zone evaluation model obtains the constraints of the heat-affected zone width h according to h<t-(We-Wr)/2 and t-(We-Wr)/2>0.

Step S306, outputting the constraint conditions of the heat-affected zone width h obtained from the heat-affected zone evaluation model.

Through the above method, the constraint condition of evaluating the width of the heat-affected zone of the pipeline is realized according to the thickness of the pipeline and when the cross-sectional characteristics of the weld meet certain conditions.

In the embodiment of the present disclosure, the thickness t of the pipeline can be input through the computer GUI, as well as the predicted weld cover width We and root weld width Wr of the oil and gas pipeline, and the heat-affected zone evaluation model can be output through the computer GUI Resulting constraints on the width h of the heat-affected zone, but not limited thereto.

The present disclosure also provides a heat-affected zone evaluation device for oil and gas transmission pipelines.

Fig. 4 is a structural block diagram of a heat-affected zone evaluation device of an oil and gas transmission pipeline according to an embodiment of the present invention. The estimated weld cover width We and the root weld width Wr of the pipeline; the determination module 404 is connected to the acquisition module 402, and is used to input the pipeline thickness t, the weld cover width We and the root weld width Wr into the heat-affected zone evaluation model, To determine the constraint conditions of the heat-affected zone width h of the oil and gas pipeline, where the heat-affected zone evaluation model obtains the heat-affected zone according to h<t-(We-Wr)/2 and t-(We-Wr)/2>0 Constraint condition of width h; output module 406, connected to determination module 404, for outputting constraint condition of heat affected zone width h obtained from heat affected zone evaluation model.

In the embodiment of the present disclosure, for a pipe with a given pipe thickness, multiple sets of weld cross-sectional features can be set, and the constraints of the heat-affected zone width h corresponding to each set of weld cross-sectional features can be evaluated, according to the difficulty of the welding process , cost, etc. to select the constraints of the weld section characteristics and heat-affected zone width h used in welding.

The present disclosure also provides a method for evaluating the performance of an oil and gas transmission pipeline, which realizes the evaluation of whether the oil and gas transmission pipeline meets the performance requirements according to the thickness of the pipeline, the width of the weld cover and the width of the root weld, and the performance requirements include the heat affected zone of the weld Softening properties.

Fig. 5 is a flowchart of a method for evaluating the performance of an oil and gas transmission pipeline according to an embodiment of the present invention. As shown in Fig. 5 , the method includes steps S502 to S506.

Step S502 , detecting the pipe thickness t, weld cover width We, root weld width Wr, and heat-affected zone width h of the oil and gas transportation pipeline.

Step S504, input the pipe thickness t, weld cap width We, root weld width Wr, and heat-affected zone width h into the heat-affected zone evaluation model to judge whether the heat-affected zone width h of the oil and gas pipeline satisfies the constraints, where , the constraints are h<t-(We-Wr)/2 and t-(We-Wr)/2>0.

Step S506, when the heat-affected zone width h<t-(We-Wr)/2 and t-(We-Wr)/2>0, it is determined that the welding of the oil and gas pipeline meets the performance requirements.

Through the above method, the performance of the pipeline can be evaluated according to the thickness of the pipeline, the cross-sectional characteristics of the weld and the width of the heat-affected zone, which has the advantage of being simple and easy to operate.

The disclosure also provides a performance evaluation device for oil and gas transmission pipelines.

Fig. 6 is a structural block diagram of a performance evaluation device for an oil and gas transportation pipeline according to an embodiment of the present invention. As shown in Fig. 6, the device includes: a detection module 602 for detecting the pipe thickness t and the width of the weld cover of the oil and gas transportation pipeline We, root weld width Wr, and heat-affected zone width h; judgment module 604, connected to detection module 602, used to input pipe thickness t, weld cover width We, root weld width Wr, and heat-affected zone width h into heat-affected Zone evaluation model to judge whether the heat-affected zone width h of the oil and gas pipeline meets the constraint conditions, where the constraint conditions are h<t-(We-Wr)/2 and t-(We-Wr)/2>0; determine Module 606, connected to the judgment module 604, is used to determine that the welding of the oil and gas transmission pipeline meets the performance requirements when the heat-affected zone width h<t-(We-Wr)/2 and t-(We-Wr)/2>0 .

The present disclosure also provides a method for determining the welding process of the oil and gas transmission pipeline, which realizes determining the welding process of the oil and gas transmission pipeline according to the thickness of the pipeline, the expected width of the weld cover and the width of the root weld.

Fig. 7 is a flowchart of a method for determining a welding process of an oil and gas transmission pipeline according to an embodiment of the present invention. As shown in Fig. 7 , the method includes steps S702 to S706.

Step S702, obtaining the pipeline thickness t of the oil and gas transmission pipeline, and the expected weld cover width We and root weld width Wr of the oil and gas transmission pipeline.

Step S704, input the pipe thickness t, weld cap width We and root weld width Wr into the heat-affected zone evaluation model to determine the constraints on the heat-affected zone width h of the oil and gas pipeline, where the heat-affected zone evaluation model is based on h <t-(We-Wr)/2 and t-(We-Wr)/2>0 get the constraints of the heat-affected zone width h.

Step S706, based on the corresponding relationship between the constraint condition of the heat-affected zone width h and the welding process information, determine the welding process information when the oil and gas transportation pipeline meets the constraint condition of the heat-affected zone width h, wherein the welding process information includes welding method and welding method Corresponding process parameters.

Through the above method, the welding process of the pipeline is determined according to the pipeline thickness and the characteristics of the weld seam section, which has the advantage of being simple and easy to operate.

In the embodiment of the present disclosure, the pipeline thickness t of the oil and gas transmission pipeline, and the expected weld cover width We and root weld width Wr of the oil and gas transmission pipeline can be obtained through the computer GUI, and the welding process information can be output through the computer GUI. The corresponding relationship between the constraint condition of the heat-affected zone width h and the welding process information is pre-stored in the database, but is not limited thereto.

The present disclosure also provides a welding process determination device for oil and gas transmission pipelines.

Fig. 8 is a structural block diagram of an apparatus for determining a welding process of an oil and gas transportation pipeline according to an embodiment of the present invention. Estimated weld cover width We and root weld width Wr; the first determination module 804, connected to the acquisition module 802, is used to input the pipe thickness t, weld cover width We and root weld width Wr into the heat-affected zone evaluation model , to determine the constraint conditions of the heat-affected zone width h of the oil and gas pipeline, where the heat-affected zone evaluation model obtains the heat-affected zone according to h<t-(We-Wr)/2 and t-(We-Wr)/2>0 Constraint conditions of zone width h; the second determination module 806, connected to the first determination module 804, is used to determine that the oil and gas transportation pipeline satisfies the heat-affected zone width h based on the corresponding relationship between the constraint conditions of the heat-affected zone width h and the welding process information The welding process information under the constraint conditions, wherein the welding process information includes the welding method and the corresponding process parameters of the welding method.

Without limitation, the above method can be applied to pipes with X70 or X80 type pipe steel plates to evaluate girth welds prepared by manual welding (SMAW) and semi-automatic welding (FCAW-S).

This embodiment also provides a computer device, such as a smart phone, a tablet computer, a notebook computer, a desktop computer, a rack server, a blade server, a tower server, or a cabinet server (including an independent server, or A server cluster composed of multiple servers), etc. The computer device 20 in this embodiment at least includes but is not limited to: a memory 21 and a processor 22 that can be communicatively connected to each other through a system bus, as shown in FIG. 9 . It should be noted that FIG. 9 only shows computer device 20 having components 21-22, but it should be understood that implementation of all of the illustrated components is not required and that more or fewer components may instead be implemented.

In this embodiment, the memory 21 (that is, a readable storage medium) includes a flash memory, a hard disk, a multimedia card, a card-type memory (for example, SD or DX memory, etc.), a random access memory (RAM), a static random access memory (SRAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), Programmable Read Only Memory (PROM), Magnetic Memory, Magnetic Disk, Optical Disk, etc. In some embodiments, the memory 21 may be an internal storage unit of the computer device 20 , such as a hard disk or memory of the computer device 20 . In other embodiments, the memory 21 can also be an external storage device of the computer device 20, such as a plug-in hard disk equipped on the computer device 20, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, flash memory card (Flash Card), etc. Of course, the storage 21 may also include both the internal storage unit of the computer device 20 and its external storage device. In this embodiment, the memory 21 is generally used to store the operating system and various application software installed in the computer device 20, such as the program code of the agent task management device 10 in the first embodiment. In addition, the memory 21 can also be used to temporarily store various types of data that have been output or will be output.

In some embodiments, the processor 22 may be a central processing unit (Central Processing Unit, CPU), a controller, a microcontroller, a microprocessor, or other data processing chips. The processor 22 is generally used to control the overall operation of the computer device 20 . In this embodiment, the processor 22 is configured to run program codes stored in the memory 21 or process data, such as any of the above-mentioned devices, so as to implement the corresponding method.

This embodiment also provides a computer-readable storage medium, such as flash memory, hard disk, multimedia card, card-type memory (for example, SD or DX memory, etc.), random access memory (RAM), static random access memory (SRAM), Read memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, magnetic disk, optical disk, server, App application store, etc., on which computer programs are stored, The corresponding functions are realized when the program is executed by the processor. The computer-readable storage medium in this embodiment is used to store any of the above devices, and implements the corresponding method when executed by a processor.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation.

The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technical fields , are all included in the scope of patent protection of the present invention in the same way.

Claims (10)

1. A method for evaluating the heat-affected zone of an oil and gas pipeline, characterized in that it comprises: Obtain the pipeline thickness t of the oil and gas transmission pipeline, and the expected weld cap width We and root weld width Wr of the oil and gas transmission pipeline; Input the pipe thickness t, the weld cover width We and the root weld width Wr into the heat-affected zone evaluation model to determine the constraints on the heat-affected zone width h of the oil and gas transportation pipeline, wherein the The heat-affected zone evaluation model obtains the constraint condition of the heat-affected zone width h according to h<t-(We-Wr)/2 and t-(We-Wr)/2>0; outputting the constraint condition of the heat-affected zone width h obtained from the heat-affected zone evaluation model. 2. The method according to claim 1, characterized in that, the oil and gas transportation pipeline is a pipeline of X70 or X80 type pipeline steel plate. 3. A method for evaluating the performance of an oil and gas pipeline, characterized in that it comprises: Detect the pipe thickness t, weld cover width We, root weld width Wr and heat affected zone width h of the oil and gas pipeline; Input the pipe thickness t, the weld cover width We, the root weld width Wr and the heat-affected zone width h into the heat-affected zone evaluation model to determine the heat-affected zone width h of the oil and gas pipeline Whether the constraint condition is satisfied, wherein the constraint condition is h<t-(We-Wr)/2 and t-(We-Wr)/2>0; When the heat-affected zone width h<t-(We-Wr)/2 and t-(We-Wr)/2>0, it is determined that the welding of the oil and gas pipeline meets the performance requirements. 4. The method according to claim 3, characterized in that, the oil and gas transportation pipeline is a pipeline of X70 or X80 type pipeline steel plate. 5. A method for determining a welding process of an oil and gas pipeline, characterized in that it comprises: Obtain the pipeline thickness t of the oil and gas transmission pipeline, and the expected weld cap width We and root weld width Wr of the oil and gas transmission pipeline; Input the pipe thickness t, the weld cover width We and the root weld width Wr into the heat-affected zone evaluation model to determine the constraints on the heat-affected zone width h of the oil and gas transportation pipeline, wherein the The heat-affected zone evaluation model obtains the constraint condition of the heat-affected zone width h according to h<t-(We-Wr)/2 and t-(We-Wr)/2>0; Based on the corresponding relationship between the constraints of the heat-affected zone width h and the welding process information, determine the welding process information when the oil and gas transportation pipeline satisfies the constraints of the heat-affected zone width h, wherein the welding process information includes Welding method and process parameters corresponding to the welding method. 6. The method according to claim 5, characterized in that, the oil and gas transportation pipeline is a pipeline of X70 or X80 type pipeline steel plate. 7. A heat-affected zone evaluation device for oil and gas pipelines, characterized in that it comprises: An acquisition module, configured to acquire the pipeline thickness t of the oil and gas transmission pipeline, and the expected weld cap width We and root weld width Wr of the oil and gas transmission pipeline; A determining module, configured to input the pipe thickness t, the weld cover width We and the root weld width Wr into the heat-affected zone evaluation model, so as to determine the constraints on the heat-affected zone width h of the oil and gas transportation pipeline , wherein, the heat-affected zone evaluation model obtains the constraint condition of the heat-affected zone width h according to h<t-(We-Wr)/2 and t-(We-Wr)/2>0; An output module, configured to output the constraint condition of the heat-affected zone width h obtained by the heat-affected zone evaluation model. 8. A performance evaluation device for oil and gas pipelines, characterized in that it comprises: The detection module is used to detect the pipe thickness t, the weld cover width We, the root weld width Wr and the heat affected zone width h of the oil and gas pipeline; A judging module, configured to input the pipe thickness t, the weld cover width We, the root weld width Wr, and the heat-affected zone width h into the heat-affected zone evaluation model to judge the oil and gas transmission pipeline Whether the heat-affected zone width h satisfies the constraints, wherein the constraints are h<t-(We-Wr)/2 and t-(We-Wr)/2>0; The determination module is used to determine that the welding of the oil and gas transmission pipeline meets the performance requirements when the heat-affected zone width h<t-(We-Wr)/2 and t-(We-Wr)/2>0. 9. A welding process determination device for oil and gas pipelines, characterized in that it comprises: An acquisition module, configured to acquire the pipeline thickness t of the oil and gas transmission pipeline, and the expected weld cap width We and root weld width Wr of the oil and gas transmission pipeline; The first determining module is used to input the pipe thickness t, the weld cover width We and the root weld width Wr into the heat-affected zone evaluation model, so as to determine the heat-affected zone width h of the oil and gas transportation pipeline Constraint conditions, wherein the heat-affected zone evaluation model obtains the constraint conditions of the heat-affected zone width h according to h<t-(We-Wr)/2 and t-(We-Wr)/2>0; The second determination module is configured to determine the welding process information when the oil and gas transportation pipeline satisfies the constraint condition of the heat-affected zone width h based on the corresponding relationship between the constraint condition of the heat-affected zone width h and the welding process information, wherein , the welding process information includes a welding method and process parameters corresponding to the welding method. 10. A computer device, characterized in that it comprises a memory, a processor, and a computer program stored on the memory and operable on the processor, when the processor executes the computer program, any one of claims 1 to 6 is realized. A step of said method.