CN114952111A - Welding method and welding device for long-distance pipeline, processor and storage medium - Google Patents
Welding method and welding device for long-distance pipeline, processor and storage medium Download PDFInfo
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- 238000003466 welding Methods 0.000 title claims abstract description 117
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- 229910000831 Steel Inorganic materials 0.000 claims description 21
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- 230000009467 reduction Effects 0.000 claims description 10
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- 239000007789 gas Substances 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
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Abstract
The embodiment of the invention provides a welding method and a welding device for a long-distance pipeline, a processor and a storage medium, and belongs to the technical field of pipeline welding. The welding method for the long-distance pipeline comprises the following steps: acquiring the preset conveying capacity of the long-distance pipeline; determining the outer diameter of the long-distance pipeline according to the preset conveying capacity; determining the wall thickness of a straight pipe of the straight pipe and the wall thickness of an elbow of the elbow according to the outer diameter of the pipeline and the preset delivery capacity, wherein the wall thickness of the elbow is greater than that of the straight pipe; correcting the wall thickness of the straight pipe to obtain the corrected wall thickness of the straight pipe, wherein the corrected wall thickness of the straight pipe is equal to the wall thickness of the bent pipe; respectively selecting a straight pipe and an elbow pipe according to the corrected wall thickness of the straight pipe and the corrected outer diameter of the pipeline, and the corrected wall thickness of the elbow pipe and the corrected outer diameter of the pipeline; and welding the selected straight pipe and the selected bent pipe. By adopting the technical scheme of the embodiment of the invention, the hidden danger of crater failure can be reduced.
Description
Technical Field
The invention relates to the technical field of pipeline welding, in particular to a welding method and a welding device for a long-distance pipeline, a processor and a storage medium.
Background
In the prior art, when a straight pipe and an elbow pipe in a long-distance pipeline are butt-welded, butt joint misalignment is often formed in the root welding bead inside the pipeline, the existence of the butt joint misalignment easily causes weld stress concentration, namely, stress distribution is uneven, and the hidden danger of weld failure possibly exists in the subsequent use process. Therefore, the existing welding method for the long-distance pipeline has the hidden danger of weld crater failure.
Disclosure of Invention
The embodiment of the invention aims to provide a welding method for a long-distance pipeline, a welding device for the long-distance pipeline, a processor, the long-distance pipeline and a storage medium, so as to solve the problem of hidden danger of crater failure in the prior art.
In order to achieve the above object, a first aspect of embodiments of the present invention provides a welding method for a long distance pipeline, the long distance pipeline including a straight pipe and a bent pipe, the welding method including:
acquiring the preset conveying capacity of the long-distance pipeline;
determining the outer diameter of the long-distance pipeline according to the preset conveying capacity;
determining the wall thickness of a straight pipe of the straight pipe and the wall thickness of an elbow of the elbow according to the outer diameter of the pipeline and the preset delivery capacity, wherein the wall thickness of the elbow is greater than that of the straight pipe;
correcting the wall thickness of the straight pipe to obtain the corrected wall thickness of the straight pipe, wherein the corrected wall thickness of the straight pipe is equal to the wall thickness of the bent pipe;
respectively selecting a straight pipe and an elbow according to the corrected wall thickness of the straight pipe and the corrected outer diameter of the pipeline, and the wall thickness of the elbow and the corrected outer diameter of the pipeline;
and welding the selected straight pipe and the selected bent pipe.
In the embodiment of the invention, the method for determining the outer diameter of the long-distance pipeline according to the preset conveying amount comprises the following steps: and determining the outer diameter of the long-distance pipeline according to the preset conveying amount based on the corresponding relation between the pre-stored conveying amount and the outer diameter of the pipeline.
In the embodiment of the present invention, determining the wall thickness of a straight pipe and the wall thickness of an elbow according to the outer diameter of a pipe and a preset delivery amount includes: obtaining the regional grade of the region where the long-distance pipeline is located, wherein the regional grade is obtained by dividing according to population density; determining a straight pipe strength coefficient corresponding to the region grade according to the region grade; determining the straight pipe pressure of the straight pipe according to the preset delivery capacity; determining the minimum yield strength of the straight pipe and the curvature radius of the bent pipe according to the outer diameter of the pipeline; determining the wall thickness of the straight pipe according to the pressure of the straight pipe, the outer diameter of the pipeline, the minimum yield strength, the strength coefficient of the straight pipe and preset parameters of the straight pipe; and determining the wall thickness of the elbow according to the wall thickness of the straight pipe, the curvature radius and the outer diameter of the pipeline.
In the embodiment of the invention, the preset parameters of the straight pipe comprise the welding seam coefficient of the straight pipe and the temperature reduction coefficient of the straight pipe; determining the wall thickness of the straight pipe according to the pressure of the straight pipe, the outer diameter of the pipeline, the minimum yield strength, the strength coefficient of the straight pipe and the preset parameters of the straight pipe, wherein the wall thickness of the straight pipe is determined according to a formula (1):
wherein, delta is the wall thickness of the straight pipe, P is the pressure of the straight pipe, D is the outer diameter of the pipeline, and sigma is S In order to achieve the minimum yield strength,
and F is a welding seam coefficient, F is a straight pipe strength coefficient, and t is a temperature reduction coefficient.
In embodiments of the present invention, determining the elbow wall thickness from the straight tube wall thickness, the radius of curvature, and the pipe outer diameter comprises determining the elbow wall thickness according to equation (2):
δ b δ × m δ × (4R-d/4R-2d) formula (2)
Wherein, delta b The thickness of the elbow is delta, the thickness of the straight pipe is delta, m is the pipe wall thickness increasing coefficient of the elbow, R is the curvature radius, and d is the outer diameter of the pipeline.
In the embodiment of the present invention, determining the straight pipe strength coefficient corresponding to the region class according to the region class includes: and determining the straight pipe intensity coefficient corresponding to the region grade according to the region grade based on the corresponding relation between the pre-stored region grade and the straight pipe intensity coefficient.
In the embodiment of the invention, the determining the straight pipe pressure of the straight pipe according to the preset delivery capacity comprises the following steps: and determining the straight pipe pressure of the straight pipe according to the preset delivery based on the corresponding relation between the delivery and the pressure stored in advance.
In the embodiment of the invention, the determination of the minimum yield strength of the straight pipe and the curvature radius of the bent pipe according to the outer diameter of the pipeline comprises the following steps: determining the minimum yield strength of the straight pipe according to the outer diameter of the pipeline based on the pre-stored corresponding relationship between the outer diameter of the pipeline and the minimum yield strength; and determining the curvature radius of the bent pipe according to the outer diameter of the pipeline based on the pre-stored corresponding relation between the outer diameter of the pipeline and the curvature radius.
In the embodiment of the invention, the welding of the selected straight pipe and the selected bent pipe comprises the following steps: and welding the selected straight pipe and the bent pipe in a welding mode of root welding, filling welding and cover surface welding in sequence.
In the embodiment of the invention, the single filling thickness corresponding to the filling welding is not more than 2.5 mm.
In the embodiment of the invention, the selected straight pipe and the selected bent pipe are welded by adopting a double V-shaped composite groove.
In the embodiment of the invention, the range of the strength coefficient of the straight pipe comprises 0.4-0.8.
A second aspect of embodiments of the present invention provides a processor configured to perform a welding method for long-distance pipes according to the above.
A third aspect of an embodiment of the present invention provides a welding apparatus for a long distance pipeline, including: according to the processor described above.
In a fourth aspect of the embodiments of the present invention, a long distance pipeline is provided, where the long distance pipeline includes a straight pipe and a bent pipe, and the long distance pipeline is welded according to the welding method for the long distance pipeline.
A fifth aspect of embodiments of the present invention provides a machine-readable storage medium having instructions stored thereon, which when executed by a processor, cause the processor to perform a welding method for long transport pipes according to the above.
According to the technical scheme, the preset conveying capacity of the long-distance pipeline is obtained, the outer diameter of the long-distance pipeline is determined according to the preset conveying capacity, the wall thickness of the straight pipe and the wall thickness of the bent pipe are determined according to the outer diameter of the pipeline and the preset conveying capacity, the wall thickness of the straight pipe is corrected to obtain the corrected wall thickness of the straight pipe, the corrected wall thickness of the straight pipe is equal to the wall thickness of the bent pipe, the straight pipe and the bent pipe are selected according to the corrected wall thickness of the straight pipe and the corrected outer diameter of the pipeline, the wall thickness of the bent pipe and the outer diameter of the pipeline respectively, and the selected straight pipe and the selected bent pipe are welded. According to the scheme, the wall thickness of the straight pipe is increased to the wall thickness which is the same as that of the bent pipe, the problem that the welding seam stress concentration is caused due to the fact that the butt welding seam with different wall thicknesses is staggered inside the pipe in the long-distance pipeline can be avoided, the stability of the welding quality of the pipeline is improved, the hidden danger that the welding seam fails is greatly reduced, and the safety of the long-distance pipeline is guaranteed.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a schematic flow chart illustrating a welding method for long distance pipeline according to an embodiment of the present invention;
FIG. 2(a) is a schematic diagram of a straight pipe and a bent pipe in the prior art according to an embodiment of the present invention;
FIG. 2(b) is a schematic diagram illustrating butt welding of the straight pipe and the bent pipe in FIG. 2(a) according to an embodiment of the present invention;
FIG. 3(a) is a schematic diagram showing the structure of a straight pipe and a bent pipe according to an embodiment of the present invention;
fig. 3(b) schematically shows a schematic view of butt welding of the straight pipe and the bent pipe in fig. 3(a) in an embodiment of the present invention.
Description of the reference numerals
1 straight pipe and 2 bent pipes
3 weld seam
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 schematically shows a flow diagram of a welding method for long-distance pipelines according to an embodiment of the invention. As shown in fig. 1, in an embodiment of the present invention, a welding method for a long distance pipeline is provided, where the long distance pipeline includes a straight pipe and a bent pipe, and the application of the welding method to a processor is described as an example, the welding method may specifically include the following steps:
and step S102, acquiring the preset conveying capacity of the long-distance pipeline.
And step S104, determining the outer diameter of the long-distance pipeline according to the preset conveying amount.
And S106, determining the wall thickness of the straight pipe and the wall thickness of the bent pipe according to the outer diameter of the pipeline and the preset conveying capacity, wherein the wall thickness of the bent pipe is greater than that of the straight pipe.
And S108, correcting the wall thickness of the straight pipe to obtain the corrected wall thickness of the straight pipe, wherein the corrected wall thickness of the straight pipe is equal to the wall thickness of the bent pipe.
And step S110, respectively selecting a straight pipe and an elbow pipe according to the corrected wall thickness and the corrected outer diameter of the straight pipe and the corrected wall thickness and the corrected outer diameter of the elbow pipe.
And step S112, welding the selected straight pipe and the selected bent pipe.
It is understood that the long-distance pipeline can be used for transporting mediums such as natural gas, petroleum and the like, and the preset transport amount is the transport amount of the mediums, such as gas transport amount and the like, of the preset long-distance pipeline within a certain preset time range (for example, one year).
Specifically, the processor may obtain a preset delivery amount of the long delivery pipeline input by a user or preset and stored, and determine the outer diameter of the long delivery pipeline according to the preset delivery amount, for example, the outer diameter of the long delivery pipeline may be determined according to a corresponding relationship between the delivery amount and the outer diameter of the pipeline, or the preset delivery amount may be used as an input amount based on a prestored algorithm representing a relationship between the delivery amount and the outer diameter of the pipeline, so as to obtain an output result, that is, the outer diameter of the long delivery pipeline. Further, the straight wall thickness of the straight pipe and the curved wall thickness of the curved pipe may be determined based on the pipe outer diameter and the preset delivery amount, for example, the straight wall thickness of the straight pipe may be determined based on the correspondence among the pipe outer diameter, the preset delivery amount, and the straight wall thickness, the curved wall thickness of the curved pipe may be determined based on the correspondence among the pipe outer diameter, the preset delivery amount, and the curved wall thickness, or the straight wall thickness of the straight pipe and the curved wall thickness of the curved pipe may be determined based on the correspondence among the pipe outer diameter, the preset delivery amount, the straight wall thickness, and the curved wall thickness, respectively, wherein the curved wall thickness is greater than the straight wall thickness. At this time, the processor may correct the wall thickness of the straight pipe, that is, increase the wall thickness of the straight pipe, so that the corrected wall thickness of the straight pipe is equal to the wall thickness of the bent pipe. Therefore, the processor can select the type of the straight pipe according to the corrected wall thickness of the straight pipe and the outer diameter of the pipeline, and select the type of the bent pipe according to the wall thickness of the bent pipe and the outer diameter of the pipeline, and then the processor can control a specific actuating mechanism (such as a welding machine or a welding robot) to weld the selected straight pipe and the selected bent pipe so as to obtain the long-distance pipeline.
According to the welding method for the long-distance pipeline, the preset conveying amount of the long-distance pipeline is obtained, the outer diameter of the long-distance pipeline is determined according to the preset conveying amount, the wall thickness of the straight pipe and the wall thickness of the bent pipe are determined according to the outer diameter of the pipeline and the preset conveying amount, the wall thickness of the straight pipe is corrected to obtain the corrected wall thickness of the straight pipe, the corrected wall thickness of the straight pipe is equal to the wall thickness of the bent pipe, the straight pipe and the bent pipe are selected according to the corrected wall thickness of the straight pipe, the corrected outer diameter of the pipeline, the wall thickness of the bent pipe and the outer diameter of the pipeline respectively, and the selected straight pipe and the selected bent pipe are welded. According to the scheme, the wall thickness of the straight pipe is increased to the wall thickness which is the same as that of the bent pipe, the problem that the welding seam stress concentration is caused due to the fact that the butt welding seam with different wall thicknesses is staggered inside the pipe in the long-distance pipeline can be avoided, the stability of the welding quality of the pipeline is improved, the hidden danger that the welding seam fails is greatly reduced, and the safety of the long-distance pipeline is guaranteed.
In one embodiment, determining the outer diameter of the long-distance pipeline according to the preset conveying amount comprises the following steps: and determining the outer diameter of the long-distance pipeline according to the preset conveying amount based on the corresponding relation between the pre-stored conveying amount and the outer diameter of the pipeline.
It is understood that the processor may pre-store the corresponding relationship between the pipeline transportation amount and the pipeline outer diameter, so as to determine the pipeline outer diameter of the long transportation pipeline according to the preset transportation amount.
In one embodiment, determining the straight pipe wall thickness of the straight pipe and the elbow wall thickness of the elbow according to the outer diameter of the pipe and the preset delivery capacity comprises: acquiring the regional grade of the region where the long-distance pipeline is located, wherein the regional grade is obtained by dividing according to population density; determining a straight pipe strength coefficient corresponding to the region grade according to the region grade; determining the straight pipe pressure of the straight pipe according to the preset delivery capacity; determining the minimum yield strength of the straight pipe and the curvature radius of the bent pipe according to the outer diameter of the pipeline; determining the wall thickness of the straight pipe according to the pressure of the straight pipe, the outer diameter of the pipeline, the minimum yield strength, the strength coefficient of the straight pipe and preset parameters of the straight pipe; and determining the wall thickness of the elbow according to the wall thickness of the straight pipe, the curvature radius and the outer diameter of the pipeline.
It can be understood that a plurality of different regional grades can be obtained according to the size of the population density, and the straight pipe intensity coefficient is the intensity coefficient of a straight pipe, and the straight pipe intensity coefficient is related to the regional grade. The preset parameters of the straight pipe are preset parameters of the straight pipe, such as the temperature reduction coefficient of the straight pipe.
Specifically, the processor may obtain a region grade of a region where the long transmission pipeline is located, which is input by a user, so as to determine a straight pipe strength coefficient corresponding to the region grade according to the region grade, and determine a straight pipe pressure of the straight pipe according to a preset transmission amount, for example, the region grade may be used as an input amount according to a prestored algorithm representing a relationship between the region grade and the straight pipe strength coefficient, so as to obtain an output result, that is, a straight pipe strength coefficient, and the preset transmission amount may be used as an input amount according to a prestored algorithm representing a relationship between the transmission amount and the pressure, so as to obtain an output result, that is, the straight pipe pressure of the straight pipe. The processor may further determine the minimum yield strength of the straight pipe and the curvature radius of the bent pipe according to the outer diameter of the pipe, for example, determine a steel grade corresponding to the outer diameter of the pipe according to a corresponding relationship between the outer diameter of the pipe and the steel grade, and then determine the minimum yield strength of the straight pipe according to the steel grade, or determine the curvature radius of the bent pipe according to the outer diameter of the pipe based on a pre-stored algorithm of the outer diameter of the pipe and the curvature radius. Therefore, the wall thickness of the straight pipe is determined according to the pressure of the straight pipe, the outer diameter of the pipeline, the minimum yield strength, the strength coefficient of the straight pipe and the preset parameters of the straight pipe, for example, the wall thickness of the straight pipe can be determined through an algorithm obtained through pre-training, the algorithm can comprise the pressure of the straight pipe, the outer diameter of the pipeline, the minimum yield strength, the strength coefficient of the straight pipe, the preset parameters of the straight pipe, the wall thickness of the straight pipe and other parameters, the wall thickness of the elbow is further determined according to the wall thickness of the straight pipe, the radius of curvature and the outer diameter of the pipeline, and the wall thickness of the elbow can be determined through a predetermined algorithm comprising the wall thickness of the straight pipe, the radius of curvature, the outer diameter of the pipeline and the wall thickness of the elbow, for example.
In one embodiment, the preset parameters of the straight pipe can comprise a welding seam coefficient of the straight pipe and a temperature reduction coefficient of the straight pipe; determining the wall thickness of the straight pipe according to the pressure of the straight pipe, the outer diameter of the pipeline, the minimum yield strength, the strength coefficient of the straight pipe and preset parameters of the straight pipe, wherein the wall thickness of the straight pipe can be determined according to a formula (1):
wherein, delta is the wall thickness of the straight pipe, P is the pressure of the straight pipe, D is the outer diameter of the pipeline, and sigma is S In order to achieve the minimum yield strength,
is the weld coefficient, F is the straight tube strength coefficient, and t is the temperature reduction coefficient.
In the embodiment of the invention, the formula (1) considers a plurality of parameters of the straight pipe, and the wall thickness of the straight pipe is determined through the formula (1), so that the accuracy of the wall thickness of the straight pipe can be improved.
In one embodiment, determining the elbow wall thickness from the straight tube wall thickness, the radius of curvature, and the pipe outer diameter may include determining the elbow wall thickness according to equation (2):
δ b δ × m δ × (4R-d/4R-2d) formula (2)
Wherein, delta b The thickness of the elbow is delta, the thickness of the straight pipe is delta, m is the pipe wall thickness increasing coefficient of the elbow, R is the curvature radius, and d is the outer diameter of the pipeline.
In the embodiment of the invention, the wall thickness of the bent pipe is determined by the formula (2), so that the accuracy of the wall thickness of the bent pipe can be improved.
In one embodiment, determining the straight pipe strength coefficient corresponding to the region grade according to the region grade comprises: and determining the straight pipe intensity coefficient corresponding to the region grade according to the region grade based on the corresponding relation between the pre-stored region grade and the straight pipe intensity coefficient.
In one embodiment, determining the straight pipe pressure of the straight pipe according to the preset delivery amount comprises: and determining the straight pipe pressure of the straight pipe according to the preset delivery based on the corresponding relation between the pre-stored delivery and the pressure.
In one embodiment, determining the minimum yield strength of a straight pipe and the radius of curvature of a bent pipe from the outer diameter of the pipe comprises: determining the minimum yield strength of the straight pipe according to the outer diameter of the pipeline based on the pre-stored corresponding relationship between the outer diameter of the pipeline and the minimum yield strength; and determining the curvature radius of the bent pipe according to the outer diameter of the pipeline based on the pre-stored corresponding relation between the outer diameter of the pipeline and the curvature radius.
In one embodiment, welding the selected straight and curved tubes comprises: and welding the selected straight pipe and the bent pipe in a welding mode of root welding, filling welding and cover surface welding in sequence.
It is understood that the welding process of the bent pipe and the straight pipe may include root welding, filling welding and facing welding, which are sequentially performed.
In one embodiment, the fill weld corresponds to a single fill thickness of no more than 2.5 mm.
It is understood that the single fill thickness of the fill weld does not exceed 2.5 mm. Root welding (including hot welding) is performed to complete the welding of the blunt edge, then filling welding is performed, the filling thickness is not more than 2.5mm each time, and finally facing welding is performed.
In one embodiment, the selected straight pipe and the selected bent pipe are welded by adopting a double V-shaped compound groove.
In one embodiment, the range of the straight tube intensity factor comprises 0.4-0.8.
It can be understood that the straight pipe strength coefficient in the range can improve the transportation safety of the long-distance pipeline.
It is understood that the range of the straight pipe intensity coefficient can include 0.4-0.8, and the regional grades are divided according to population density and can include first-class, first-class second-class, third-class or fourth-class, and the like. Wherein, the design coefficient of the first class area can be 0.8, the design coefficient of the first class area and the second class area can be 0.72, the design coefficient of the second class area can be 0.6, the design coefficient of the third class area can be 0.5, and the design coefficient of the fourth class area can be 0.4.
In one embodiment, the long transport pipe may be the entire mountainous long transport pipe or a local area of the mountainous long transport pipe, typically not exceeding 50Km in length. The welding method for the long-distance pipeline is applicable to mountainous terrain complex (the general gradient is usually more than 15 degrees), 3-5 parts/km of ditches and 3-5 parts/km of rural roads.
In the embodiment of the invention, the welding method for the long-distance pipeline can be used for welding construction of the pipeline in mountainous areas with large topographic relief, more than 60% of regional gradient of more than 15 degrees and complex construction conditions (for example, 3-5/km in a ditch and 3-5/km in a rural road).
In the prior art, as shown in fig. 2(a) and 2(b), a straight pipe and a bent pipe have the same outer diameter and different wall thickness. In the embodiment of the present invention, as shown in fig. 3(a) and 3(b), the outer diameter and the wall thickness of the straight pipe and the curved pipe are the same. The wall thickness of a straight pipe (e.g., a straight steel pipe) and a bent pipe (e.g., a hot bend pipe) constituting a long-distance pipeline can be determined, as shown in fig. 2(a) and 2(b), under the same design factor (i.e., straight pipe strength factor), the wall thickness of the bent pipe 2 is greater than the wall thickness of the straight pipe 1, and the inner diameter of the bent pipe 2 is smaller than the inner diameter of the straight pipe 1, so that the problems of misalignment and stress concentration exist inside the pipeline after the bent pipe 2 is welded with the straight pipe 1, and the misalignment is mainly formed near the welding seam 3. As shown in fig. 3(a) and 3(b), the wall thickness of the straight pipe 1 is increased to be the same as that of the bent pipe 2, the outer diameter is kept unchanged, and the bent pipe 2 and the straight pipe 1 are welded, so that the formation of staggered edges can be reduced or even avoided, and the probability of weld failure is reduced.
In the exemplary embodiment, the welding method for the long-distance pipeline has the one-time welding yield of over 95 percent, and the welding misalignment amount is within 2 mm.
The welding method for long-distance pipelines provided by the embodiment of the invention is described in the following by combining with another specific embodiment.
Under the same design coefficient (namely the straight pipe strength coefficient), the pipe wall thickness for a common line is increased to the design principle that the wall thickness of the main pipe of the hot bending pipe under the design coefficient is the same.
Taking a certain long pipeline as an example, the total length of the pipeline is 43.6Km, the designed conveying pressure of the pipeline is 10.0MPa, the designed outer diameters of the straight pipe section and the hot bending pipe section are 1016mm, and the straight pipe section is made of X70 steel. The calculated wall thickness of the general section pipe of the line is 17.46mm, the wall thickness is 17.5mm in a rounding mode, the reduction rate of the hot bending pipe is 0.91, the calculated wall thickness of the hot bending pipe is 19.18mm, the wall thickness of the pipe for the hot bending is 19.2mm in a rounding mode, and the wall thickness of the general section pipe of the line in the 43.6mm middle line of the whole line is increased to 19.2mm which is the same as the wall thickness of the pipe for the hot bending pipe by adopting the design principle of equal wall thickness.
According to the design principle of the long-distance pipeline, determining that the intensity coefficient of the corresponding straight pipe is 0.6 when the regional grade is two, and respectively calculating the wall thickness and the inner diameter of the straight steel pipe section and the hot bending pipe section of the project. It can be understood that the design principle of the long-distance pipeline is a preset design principle of the long-distance pipeline, and the design principle of the long-distance pipeline can be a corresponding national standard, specifically, for example, the design specification of the gas pipeline engineering (GB 50251-.
Wherein, straight steel pipe wall thickness is relevant with design pressure, straight steel pipe external diameter, straight steel pipe's intensity grade, intensity design coefficient and temperature reduction coefficient, and the wall thickness of straight steel pipe can be calculated through formula (1):
in the formula, delta is the calculated wall thickness of the straight steel pipe, mm; p is the design pressure, and can be 10.0 MPa; d is the outer diameter of the straight steel pipe, and can be 1016 mm; sigma S The minimum yield strength of the straight steel pipe can be 485 MPa;
1.0 can be selected for the welding seam coefficient of the straight steel pipe; f is a strength design coefficient (namely a straight pipe strength coefficient), and can be 0.6; t is a temperature reduction coefficient and can be 1.0. The calculated wall thickness delta of the straight steel pipe is 17.46mm, the whole is 17.5mm and the inner diameter is 981mm, which can be obtained by the formula (1).
Wherein, the wall thickness of the hot bending elbow can be calculated by formula (2):
δ b δ × m δ × (4R-d/4R-2d) formula (2)
In the formula, delta b Calculating the wall thickness of the hot-bending bend in mm; delta is the calculated wall thickness of the straight steel pipe section connected with the hot bending elbow, and 1016mm can be taken; m is the pipe of the hot bending bendA wall thickness increase factor; r is the curvature radius of the hot bending elbow, 6D can be selected, and D is the outer diameter of the straight steel pipe; d is the outer diameter of the hot bending bend, and can be 1016 mm. The wall thickness of the obtained hot bending pipe is 19.18mm calculated by a pipe for hot bending, the whole is 19.2mm, and the inner diameter is 979.3 mm.
In order to avoid the phenomenon that the root part of a connecting welding seam of a straight steel pipe section and a hot-bending pipe section is staggered due to unequal inner diameters, the engineering adopts a sectional equal-wall-thickness design principle under the same design coefficient, the pipe wall thickness of a general circuit is improved to the design principle identical to the wall thickness of a main pipe of the hot-bending pipe under the design coefficient, the equal-wall-thickness design principle can avoid the existence of unequal wall thickness to a welding opening in a long-distance pipeline, the wall thickness of the straight steel pipe section is increased to 19.2mm from 17.5mm, the problem of the staggered edge inside the pipeline can be avoided after welding, about 800 openings (about 400 elbows) formed by welding the straight steel pipe section and the hot-bending pipe section with unequal wall thickness are greatly reduced, the welding problems of the staggered edge and the like and the stress concentration problem caused by the wall thickness difference in the welding process are greatly reduced, and the safety essence of the pipeline is greatly guaranteed.
Embodiments of the present invention provide a processor configured to execute the welding method for long-distance pipes according to the above embodiments.
The embodiment of the invention provides a welding device for a long-distance pipeline, which comprises: according to the processor in the above embodiments.
The embodiment of the invention provides a long-distance pipeline, which comprises a straight pipe and a bent pipe, wherein the long-distance pipeline is obtained by welding according to the welding method for the long-distance pipeline in the embodiment.
An embodiment of the present invention provides a machine-readable storage medium having stored thereon instructions, which when executed by a processor, cause the processor to execute the welding method for long-distance pipes according to the above-described embodiments.
In summary, the beneficial effects of the embodiment of the present invention may include:
(1) the equal wall thickness design principle in the welding method for the long-distance pipeline provided by the embodiment of the invention can avoid the problems of misalignment, stress concentration and the like of the weld crater at the root of the weld bead caused by unequal wall thickness in the long-distance pipeline, so that the welding quality of the pipeline is unstable, and the hidden danger of failure of the weld crater is reduced.
(2) By adopting the technical scheme of the embodiment of the invention, the problem of misalignment of the welding bead at the root of the welding port with about 400 hot bends, namely 800 unequal wall thicknesses can be reduced, the problems of misalignment and stress concentration of unequal wall thickness butt welding are avoided, and the intrinsic safety of the pipeline is greatly ensured.
Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (16)
1. A welding method for a long distance pipeline, which is characterized in that the long distance pipeline comprises a straight pipe and an elbow pipe, the welding method comprises the following steps:
acquiring the preset conveying capacity of the long-distance pipeline;
determining the outer diameter of the long-distance pipeline according to the preset conveying capacity;
determining the wall thickness of a straight pipe of the straight pipe and the wall thickness of an elbow of the elbow according to the outer diameter of the pipeline and the preset delivery capacity, wherein the wall thickness of the elbow is greater than the wall thickness of the straight pipe;
correcting the wall thickness of the straight pipe to obtain a corrected wall thickness of the straight pipe, wherein the corrected wall thickness of the straight pipe is equal to the wall thickness of the bent pipe;
respectively selecting the straight pipe and the bent pipe according to the corrected wall thickness of the straight pipe, the corrected outer diameter of the pipeline, the corrected wall thickness of the bent pipe and the corrected outer diameter of the pipeline;
and welding the selected straight pipe and the selected bent pipe.
2. The welding method of claim 1, wherein said determining a pipe outside diameter of said long transport pipe from said preset transport volume comprises:
and determining the outer diameter of the long-distance pipeline according to the preset conveying amount based on the corresponding relation between the pre-stored conveying amount and the outer diameter of the pipeline.
3. The welding method according to claim 1, wherein said determining a straight tube wall thickness of the straight tube and an elbow wall thickness of the elbow from the pipe outer diameter and the preset delivery amount comprises:
obtaining the regional grade of the region where the long-distance pipeline is located, wherein the regional grade is obtained by dividing according to population density;
determining a straight pipe strength coefficient corresponding to the region grade according to the region grade;
determining the straight pipe pressure of the straight pipe according to the preset delivery capacity;
determining the minimum yield strength of the straight pipe and the curvature radius of the bent pipe according to the outer diameter of the pipeline;
determining the wall thickness of the straight pipe according to the pressure of the straight pipe, the outer diameter of the pipeline, the minimum yield strength, the strength coefficient of the straight pipe and preset parameters of the straight pipe;
and determining the wall thickness of the elbow according to the wall thickness of the straight pipe, the curvature radius and the outer diameter of the pipeline.
4. A welding method according to claim 3 wherein said preset parameters of said straight pipe include the weld coefficient of said straight pipe and the temperature reduction coefficient of said straight pipe; determining the wall thickness of the straight pipe according to the pressure of the straight pipe, the outer diameter of the pipeline, the minimum yield strength, the strength coefficient of the straight pipe and preset parameters of the straight pipe, wherein the wall thickness of the straight pipe is determined according to a formula (1):
wherein, delta is the wall thickness of the straight pipe, P is the pressure of the straight pipe, D is the outer diameter of the pipeline, and sigma S Is the minimum yield strength at which the steel is to be deformed,
and F is the welding seam coefficient, F is the straight pipe strength coefficient, and t is the temperature reduction coefficient.
5. The welding method of claim 3, wherein said determining the elbow wall thickness from the straight tube wall thickness, the radius of curvature, and the pipe outer diameter comprises determining the elbow wall thickness according to equation (2):
δ b δ × m δ × (4R-d/4R-2d) formula (2)
Wherein, delta b And d is the outer diameter of the pipeline, wherein delta is the wall thickness of the straight pipe, m is the pipe wall thickness increasing coefficient of the bent pipe, R is the curvature radius.
6. The welding method according to claim 3, wherein said determining the straight pipe strength coefficient corresponding to the region grade according to the region grade comprises:
and determining the straight pipe intensity coefficient corresponding to the area grade according to the area grade based on the corresponding relation between the pre-stored area grade and the straight pipe intensity coefficient.
7. The welding method according to claim 3, wherein said determining a straight pipe pressure of the straight pipe from the preset delivery amount comprises:
and determining the straight pipe pressure of the straight pipe according to the preset delivery based on the corresponding relation between the pre-stored delivery and the pressure.
8. A welding method according to claim 3, wherein said determining a minimum yield strength of said straight pipe and a radius of curvature of said bent pipe from said pipe outside diameter comprises:
determining the minimum yield strength of the straight pipe according to the outer diameter of the pipeline based on the pre-stored corresponding relationship between the outer diameter of the pipeline and the minimum yield strength;
and determining the curvature radius of the bent pipe according to the outer diameter of the pipeline based on the pre-stored corresponding relation between the outer diameter of the pipeline and the curvature radius.
9. The welding method of claim 1, wherein said welding the selected straight tube and the bent tube comprises:
and welding the selected straight pipe and the bent pipe in a welding mode of root welding, filling welding and cover surface welding in sequence.
10. The welding method of claim 9, wherein the fill weld corresponds to a single fill thickness of no more than 2.5 mm.
11. The welding method of claim 1, wherein said selected straight tube and said selected bent tube are welded using a double V compound groove.
12. The welding method according to claim 1, wherein the range of the straight tube strength factor includes 0.4 to 0.8.
13. A processor configured to perform the welding method for long transport pipes according to any one of claims 1 to 12.
14. A welding device for long distance pipeline, characterized by comprising:
the processor of claim 13.
15. A long distance pipeline, characterized in that the long distance pipeline comprises a straight pipe and a bent pipe, and the long distance pipeline is welded according to the welding method for the long distance pipeline in any one of claims 1 to 12.
16. A machine readable storage medium having instructions stored thereon, which when executed by a processor causes the processor to perform a welding method for long distance pipes according to any of claims 1 to 12.
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