CN102982212A - Structural analysis method of in-service welding behavior of gas pipeline - Google Patents
Structural analysis method of in-service welding behavior of gas pipeline Download PDFInfo
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- CN102982212A CN102982212A CN2012105133053A CN201210513305A CN102982212A CN 102982212 A CN102982212 A CN 102982212A CN 2012105133053 A CN2012105133053 A CN 2012105133053A CN 201210513305 A CN201210513305 A CN 201210513305A CN 102982212 A CN102982212 A CN 102982212A
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Abstract
The invention discloses a structural analysis method of the in-service welding behavior of a gas pipeline. The finite element calculation software ANSYS is utilized, and the method is carried out according to the following steps that the welding condition of the in-service welding of the pipeline is determined; an entity model of the pipeline and a sleeve is created, the solving constraints and the loads of a in-service welding temperature field are applied according to practical work conditions, and the in-service welding temperature field of the pipeline is obtained through solving; a result file of the in-service welding temperature field is read, and whether the possibility that the pipeline is burnt through exists or not is preliminarily judged according to the specific value of the highest temperature of the inner wall of the pipeline; and an entity structure analysis model of the pipeline and the sleeve is created, all structure analysis results of the in-service welding of the pipeline is obtained through solving, and then, the structure response of the in-service welding behavior is evaluated according to the pipeline material performance and the stress distribution and the highest temperature of the pipeline inner wall. The structural analysis method has the advantages that the model, the load and the solving parameter can be modified according to practical work condition changes, the test workload of a welding process can be greatly reduced, the analysis efficiency is improved, and the production and test cost is reduced.
Description
Technical field
The invention belongs to pipeline in the gas pipeline engineering in the computing technique field of labour welding behavior, relate to a kind of industrial analysis method with finite element analysis software ANSYS evaluation in-service pipeline welding behavior.
Background technology
Gas pipeline owing to the impact of tubing reason or extraneous factor, the problems such as tube wall attenuate or corrosion failure can occur, thereby cause gas leakage and pipeline damage in the long service process, must reinforce and repair pipeline attenuate or damaged location for this reason.The operation pipeline become the major way that current in-service pipeline is repaired in advantages such as labour Welding Repair Technology, environmental protection and economy convenient and swift with it and social benefit are remarkable.
The process that welding is a local fast heating, cool off and solidify relates to the complex process of arc physics, mass-and heat-transfer, metallurgy and mechanical mechanism.In the labour welding process, because the high pressure of gas medium in the pipeline, media flow can be taken away the weld metal zone amount of heat simultaneously, so that welding region burns or hydrogen induced cracking easily, so rational is in that to use as a servant the technological parameter that welds most important.Adopt numerical technique to analyzing in the behavior of labour welded structure, study the trend that affects of each technological factor, just becoming a kind of appropriate design in the effective means of labour welding technology.
Summary of the invention
For above-mentioned prior art, the invention provides a kind of gas pipeline at the structure analysis method of labour welding behavior.Its purpose is to set up a kind of, comparison of computational results accurate structure analysis method of objectively evaluating in labour welding behavior high at the analysis efficiency of using as a servant the welding actual condition for pipeline
In order to solve the problems of the technologies described above, a kind of gas pipeline of the present invention in the technical scheme that the structure analysis method of using as a servant the welding behavior is achieved is: utilize the finite element analysis software ANSYS that stores in the computing machine, carry out according to following step:
Step 1: determine that pipeline in the welding condition of labour welding, comprises: the material of the size of welding technology, pipeline and sleeve pipe, pipeline and sleeve pipe, environment temperature and radiating condition at least; Wherein in determining welding technology, carry out the welding bead layout according to the arrangement requirement about the welding joint welding bead that Britain pipeline company formulates;
Step 2: the solid model that creates pipeline and sleeve pipe, definition SOLID70 dividing elements map grids, and according to actual condition be applied to labour field of welding temperature find the solution the constraint and load, wherein comprise at least: the hot production rate of environment temperature, mobile welding heat source, the forced heat-exchanging coefficient of pipe interior gas medium; Then find the solution, draw pipeline in the temperature field of labour welding;
Step 3: read in the destination file of labour field of welding temperature, and judge tentatively according to the concrete numerical value of inner-walls of duct maximum temperature whether pipeline has the possibility of being burnt;
Step 4: create pipeline and sleeve pipe entity structure analytical model, definition MESH Unit 200 and SOLID Unit 45, the node temperature that the said temperature field is obtained as load applying to Structural Analysis Model, the definition edge-restraint condition, pipe interior applies pressure load, end to pipeline and sleeve pipe applies the axial displacement constraint, then finds the solution;
Step 5: thus pipeline obtained at the entire infrastructure analysis result of labour welding, then be evaluated at the structural response of using as a servant the welding behavior according to the performance of pipeline material and maximum temperature and the stress distribution of inner-walls of duct.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention adopts finite element software modeling evaluation pipeline in the structural response characteristic of labour welding behavior, APDL writes command program with Parametric Design Language, can and find the solution parameter according to modifications model, the load of actual condition, can greatly reduce the welding procedure test workload, improve analysis efficiency, reduce the production test cost.
Description of drawings
Fig. 1 is that gas pipeline of the present invention is at the structure analysis method process flow diagram of labour welding behavior;
Fig. 2 is that sleeve pipe is at labour REPAIR WELDING structural representation;
Fig. 3 is the welding bead synoptic diagram of sleeve pipe welding;
Fig. 4 is the temperature field equal-value map when first welds in the embodiment of the invention;
Fig. 5 is the temperature field equal-value map of the weld seam section of first welding in the embodiment of the invention;
Fig. 6 is the displacement equal-value map of embodiment of the invention postwelding cool to room temperature;
Fig. 7 is that the embodiment of the invention is welded the circumference stress field when stablizing.
Embodiment
Below in conjunction with embodiment the present invention is described in further detail.
As shown in Figure 1, a kind of gas pipeline of the present invention utilizes the finite element analysis software ANSYS that stores in the computing machine at the structure analysis method of labour welding behavior, carries out according to following step:
Step 1: determine that pipeline in the welding condition of labour welding, comprises: the material of the size of welding technology, pipeline and sleeve pipe, pipeline and sleeve pipe, environment temperature and radiating condition at least; Wherein in determining welding technology, carry out the welding bead layout according to the arrangement requirement about the welding joint welding bead that Britain pipeline company formulates;
Step 2: the solid model that creates pipeline and sleeve pipe, definition SOLID70 dividing elements map grids, and according to actual condition be applied to labour field of welding temperature find the solution the constraint and load, wherein comprise at least: the hot production rate of environment temperature, mobile welding heat source, the forced heat-exchanging coefficient of pipe interior gas medium; Then find the solution, draw pipeline in the temperature field of labour welding;
Step 3: read in the destination file of labour field of welding temperature, and judge tentatively according to the concrete numerical value of inner-walls of duct maximum temperature whether pipeline has the possibility of being burnt;
Step 4: create pipeline and sleeve pipe entity structure analytical model, definition MESH Unit 200 and SOLID Unit 45, the node temperature that the said temperature field is obtained as load applying to Structural Analysis Model, the definition edge-restraint condition, pipe interior applies pressure load, end to pipeline and sleeve pipe applies the axial displacement constraint, then finds the solution;
Step 5: thus pipeline obtained at the entire infrastructure analysis result of labour welding, then be evaluated at the structural response of labour welding behavior.
Embodiment:
Utilizing the finite element analysis software ANSYS that stores in the computing machine to carry out gas pipeline may further comprise the steps in the structure analysis of labour welding behavior:
Step 1: determine in the labour welding condition: welding condition: first and second road weldering: I=90A, U=20V, welding speed V=3mm/s; Third and fourth road weldering: I=110A, U=25V, welding speed V=5mm/s; Press P=4MPa in the pipeline, gas flow rate in the pipe, v=20m/s; The pipeline external diameter is 609mm, and wall thickness is 7.1mm, and the wall thickness of sleeve pipe is 19mm, and the gap between pipeline and the sleeve pipe is 2mm, synoptic diagram such as Fig. 2.
Step 2: what create casing repairing welds solid model in labour, definition SOLID70 dividing elements map grids, and the welding of sleeve ring weld seam is designed to the weldering of 4 roads, and the joint synoptic diagram is as shown in Figure 2.When carrying out finite element analysis, for reducing the time of calculating, round 1/8th of body structure and analyze, such as the signal of weld seam section as shown in Figure 3.
When calculating in the temperature field, definition MESH200 unit and hot analytic unit are SOLID 70.The temperature of welded seam area and inner-walls of duct is target analysis of the present invention zone, and the weld metal zone temperature is higher and variable gradient is large, and grid is than comparatively dense, and element length is 2mm; Lower and variable gradient is less away from the regional temperature of weld seam, then grid is more sparse.
The definition Transfer Boundary Condition is determined the combustion gas coefficient of heat transfer under the different pressure in the pipeline, the hot production rate of thermal source under the different welding technologys.In this example, the coefficient of heat transfer of pipeline outer wall and air is taken as and is 25W/m
2° C, the forced heat-exchanging coefficient of pipe interior combustion gas is 1101W/m
2° C finds the solution, and draws pipeline in the temperature field of labour welding.Temperature field equal-value map when Fig. 4 shows the first welding; Fig. 5 shows the temperature field equal-value map of the weld seam section of first welding.
Step 3: read in the destination file of labour field of welding temperature, check the temperature field cloud atlas, and judge tentatively according to the concrete numerical value of inner-walls of duct maximum temperature whether pipeline has the possibility of being burnt.
Step 4: create pipeline and sleeve pipe entity structure analytical model, the structure analysis unit that definition MESH Unit 200 and stress element SOLID 45(and SOLID 70 are corresponding).The node temperature that the said temperature field is obtained as load applying to Structural Analysis Model, the definition edge-restraint condition, pipe interior applies pressure load, and the end of pipeline and sleeve pipe is applied the axial displacement constraint, then finds the solution.
Step 5: obtain pipeline at labour welded structure analysis result, comprise displacement, stress, principle stress, equivalent stress etc., can show certain instantaneous stress response cloud atlas in the welding process, Fig. 6 shows the displacement equal-value map of postwelding cool to room temperature, and Fig. 7 shows the circumference stress field of welding when stablizing; According to the result of ANSYS computational analysis, analyze labour welded pipe line inwall axially, the structure characteristic parameters such as hoop, equivalent stress and displacement, thereby assessment report is proposed; Or the change welding condition, re-start and calculate and analyze.
Although top invention has been described in conjunction with figure; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment only is schematic; rather than restrictive; those of ordinary skill in the art is under enlightenment of the present invention; in the situation that does not break away from aim of the present invention, can also make a lot of distortion, these all belong within the protection of the present invention.
Claims (1)
1. a gas pipeline is characterized in that at the structure analysis method of using as a servant the welding behavior, utilizes the finite element analysis software ANSYS that stores in the computing machine, carries out according to following step:
Step 1: determine that pipeline in the welding condition of labour welding, comprises: the material of the size of welding technology, pipeline and sleeve pipe, pipeline and sleeve pipe, environment temperature and radiating condition at least; Wherein in determining welding technology, carry out the welding bead layout according to the arrangement requirement about the welding joint welding bead that Britain pipeline company formulates;
Step 2: the solid model that creates pipeline and sleeve pipe, definition SOLID70 dividing elements map grids, and according to actual condition be applied to labour field of welding temperature find the solution the constraint and load, wherein comprise at least: the hot production rate of environment temperature, mobile welding heat source, the forced heat-exchanging coefficient of pipe interior gas medium; Then find the solution, draw pipeline in the temperature field of labour welding;
Step 3: read in the destination file of labour field of welding temperature, and judge tentatively according to the concrete numerical value of inner-walls of duct maximum temperature whether pipeline has the possibility of being burnt;
Step 4: create pipeline and sleeve pipe entity structure analytical model, definition MESH Unit 200 and SOLID Unit 45, the node temperature that the said temperature field is obtained as load applying to Structural Analysis Model, the definition edge-restraint condition, pipe interior applies pressure load, end to pipeline and sleeve pipe applies the axial displacement constraint, then finds the solution;
Step 5: thus pipeline obtained at the entire infrastructure analysis result of labour welding, then be evaluated at the structural response of using as a servant the welding behavior according to the performance of pipeline material and maximum temperature and the stress distribution of inner-walls of duct.
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| CN108544059A (en) * | 2018-04-20 | 2018-09-18 | 邳州中燃城市燃气发展有限公司 | A kind of method of the in-service welding of gas pipeline |
| CN108563865A (en) * | 2018-04-13 | 2018-09-21 | 海洋石油工程（青岛）有限公司 | The reinforcement method of offshore platform ultra-large type air hose |
| CN109918703A (en) * | 2019-01-10 | 2019-06-21 | 江苏理工学院 | A method of finite element analysis operating condition is quickly adjusted based on Shell language |
| CN110807279A (en) * | 2019-10-24 | 2020-02-18 | 友联船厂（蛇口）有限公司 | Repairing method for self-elevating drilling platform deformed pile leg |
| CN115099080A (en) * | 2022-04-27 | 2022-09-23 | 西安石油大学 | Finite element modeling method for predicting in-service welding temperature field of natural gas pipeline |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108563865A (en) * | 2018-04-13 | 2018-09-21 | 海洋石油工程（青岛）有限公司 | The reinforcement method of offshore platform ultra-large type air hose |
| CN108544059A (en) * | 2018-04-20 | 2018-09-18 | 邳州中燃城市燃气发展有限公司 | A kind of method of the in-service welding of gas pipeline |
| CN109918703A (en) * | 2019-01-10 | 2019-06-21 | 江苏理工学院 | A method of finite element analysis operating condition is quickly adjusted based on Shell language |
| CN110807279A (en) * | 2019-10-24 | 2020-02-18 | 友联船厂（蛇口）有限公司 | Repairing method for self-elevating drilling platform deformed pile leg |
| CN115099080A (en) * | 2022-04-27 | 2022-09-23 | 西安石油大学 | Finite element modeling method for predicting in-service welding temperature field of natural gas pipeline |
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Application publication date: 20130320 |