CN103530455A - Method for predicating t[8/5] value of fusion zone in underwater wet welding - Google Patents
Method for predicating t[8/5] value of fusion zone in underwater wet welding Download PDFInfo
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- CN103530455A CN103530455A CN201310469006.9A CN201310469006A CN103530455A CN 103530455 A CN103530455 A CN 103530455A CN 201310469006 A CN201310469006 A CN 201310469006A CN 103530455 A CN103530455 A CN 103530455A
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Abstract
The invention discloses a method for predicating the t[8/5] value of a fusion zone in underwater wet welding. The method includes the steps that firstly, a finite element model of underwater wet welding is established through finite element calculation software, and solving constraints are set; then, heat source parameter check is carried out to complete thermal simulation of a welding process; at last, goal nodes of the fusion zone are selected according to a result, and the t[8/5] value of the fusion zone is determined by extracting data on a thermal cyclic curve of the nodes. According to the technical scheme, by means of the numerical computation method, the t[8/5] parameter value of the fusion zone can be objectively determined according to actual working conditions of underwater wet welding, and accordingly the problem of infeasibility of thermocouple measuring techniques can be solved.
Description
Technical field
The invention belongs to the welding field in Materials Processing Engineering subject, more particularly, relate to a kind of definite underwater wet welding fusion area t
8/5method.
Background technology
For the manufacturing and the assembling maintenance of offshore engineering structure, Underwater Welding is a direct technological means.The underwater welding method of application is mainly divided at present: wet method, dry method and local dry cavity.Wet method is welded and is referred in the situation that workpiece contacts with water, and welder is the method for direct welding under water.Because wet method welding can be applied to rapidly structure manufacture and reparation and economic and practical in all-position welding in emergency circumstances, therefore the in-depth analysis of this method and process optimization are had to important engineering significance.
Yet underwater wet welding is a quick and inhomogeneous thermal process, and the existence of water environment is accelerated the cooling velocity of weldment greatly.During welding, fusion area is from t cool time of 800 ℃ to 500 ℃
8/5, directly reflected that this is in the size of cooling velocity in welding process, has conclusive impact to the performance of its structural transformation and welding joint.For the welding of carrying out, generally by the measurement of temperature-difference thermoelectric even summation temperature measurer, determine the size of t8/5 parameter in gaseous environment.But when measuring wet method welding, because temp measuring system can not guarantee the state insulating, so said method is infeasible.
Summary of the invention
The object of the invention is to set up a kind of actual condition for underwater wet welding, can more objectively determine fusion area t
8/5the numerical computation method of parameter, thereby the infeasibility of solution thermocouple measurement technology.
For achieving the above object, the present invention proposes the following technical scheme Forecasting Methodology that is achieved: utilize finite element analysis software SYSWELD, the finite element model of model underwater wet welding also arranges and solves constraint; Carry out afterwards Heat-Source Parameters check, complete the thermal simulation of welding process; Finally according to result, choose the destination node of fusion area, by extracting data on the thermal cycling curve of this point, determine the t of fusion area
8/5value.Concrete implementation step is as follows:
(1) determine the welding condition of underwater wet welding, at least comprise Type of Welding (built-up welding, jam welding, end lap weld etc.), weldment size, weldment material, welding technology etc.;
(2), according to weldment size, use relevant pre-processing software to set up the computation model of wet method welding;
(3) determine the constraint that solves of wet method sweating heat process, comprise thermal boundary condition between water environment temperature, weldment initial temperature, welding heat source type, weldment and surrounding environment, and according to above-mentioned constraint condition, welding process is set;
(4) utilize the thermal source instrument of checking of SYSWELD to calculate Heat-Source Parameters according to welding technology, apply afterwards known Heat-Source Parameters and complete the simulation of per pass welding process, with reference to result of calculation, suitably regulate Heat-Source Parameters to carry out analog computation next time, iterative computation like this, until obtain suitable weld shape, can think that the parameter of Given Heat Source model is rational;
(5) apply the thermal simulation that rational heat source model completes underwater wet welding process.In Calculated Results of Temperature Field, obtain the thermal cycling curve of fusion area node, by the data point on extraction curve, can determine the t of fusion area
8/5parameter.
The invention provides a kind of underwater wet welding fusion area t
8/5forecasting Methodology, the method is used numerical simulation technology, can more objectively provide the t of wet method welding fusion area
8/5parameter value.At known t
8/5on the basis of parameter, CCT welding diagram figure that can bond material carries out the prediction of structural transformation, for the optimization of welding condition and the selection of welding material provide rational basis, thereby promotes the performance of welding joint.
Accompanying drawing explanation
Fig. 1 is the computation model of underwater wet welding in the present invention.
Fig. 2 is weld seam and the analog result of heat-affected zone and the position of fusion area node in the present invention.
Fig. 3 is the thermal cycling curve of the fusion area node that in the present invention, simulation obtains.
Embodiment
Below in conjunction with specific embodiment, further the present invention is elaborated.
(1) determine the welding condition of underwater wet welding, the dull and stereotyped built-up welding that wherein Type of Welding is SMAW, it is long * wide * thick that welding plate is of a size of 100mm * 60mm * 8mm(), welding plate material is X65 steel, welding rod adopts TS202 welding rod special for special under water, and technological parameter is as follows: welding current 160A, arc voltage 30-34V, speed of welding 3.0mm/s;
(2) application pre-treatment modeling software Visual-Weld creates the computation model of underwater wet welding, completes the three-dimensional entity model of grid division as shown in Figure 1;
(3) in SYSWELD, setting water environment temperature is 15 ℃, and weldment temperature is water environment temperature; It is Gauss's thermal source of 1:1.1 and the composite model of two ellipsoid thermals source that welding heat source is selected power ratio; Heat transfer boundary condition between weldment and surrounding environment is set as water environment and conducts heat, and convective heat-transfer coefficient is got 500W/ (m
2k);
(4) complete after above-mentioned setting, computation model is loaded in SYSWELD, according to welding condition and thermal source check instrument, calculate Heat-Source Parameters, complete whereby the first simulation of welding process, with reference to result of calculation, suitably regulate the dimensional parameters of heat source model to calculate, until obtain molten wide weld width size, the rational weld shape of fusion penetration of reaching next time;
(5) complete the temperature field simulation of underwater wet welding process, the weld seam obtaining and the analog result of heat-affected zone as shown in Figure 2, are selected in heat-affected zone apart from the nearest node of melt run as fusion area t according to the weld shape that obtains afterwards
8/5investigation point, in this example, be the fusion area t in Fig. 2
8/5investigate point.From Calculated Results of Temperature Field, extract the thermal cycling curve of this point, as shown in Figure 3, by curve map, can determine the t of the melting area of welding seam in this example
8/5value is 6.4s.
Above the present invention has been done to exemplary description; should be noted that; in the situation that not departing from core of the present invention, the replacement that is equal to that any simple distortion, modification or other those skilled in the art can not spend creative work all falls into protection scope of the present invention.
Claims (2)
1. a Forecasting Methodology of underwater wet welding fusion area t8/5, is characterized in that, utilizes finite element analysis software, and the finite element model of model underwater wet welding setting solve constraint; Carry out afterwards Heat-Source Parameters check, complete the thermal simulation of welding process; Finally according to result, choose the destination node of fusion area, by extracting data on the thermal cycling curve of this point, determine the t8/5 value of fusion area.
2. the Forecasting Methodology of a kind of underwater wet welding fusion area t8/5 according to claim 1, is characterized in that, concrete implementation step is as follows:
(1) determine the welding condition of underwater wet welding, at least comprise Type of Welding (built-up welding, jam welding, end lap weld etc.), weldment size, weldment material, welding technology etc.;
(2), according to weldment size, use relevant pre-processing software to set up the computation model of wet method welding;
(3) determine the constraint that solves of wet method sweating heat process, comprise thermal boundary condition between water environment temperature, weldment initial temperature, welding heat source type, weldment and surrounding environment, and according to above-mentioned constraint condition, welding process is set;
(4) utilize the thermal source instrument of checking of SYSWELD to calculate Heat-Source Parameters according to welding technology, apply afterwards known Heat-Source Parameters and complete the simulation of per pass welding process, with reference to result of calculation, suitably regulate Heat-Source Parameters to carry out analog computation next time, iterative computation like this, until obtain suitable weld shape, can think that the parameter of Given Heat Source model is rational;
(5) apply the thermal simulation that rational heat source model completes underwater wet welding process, in Calculated Results of Temperature Field, obtain the thermal cycling curve of fusion area node, by the data point on extraction curve, can determine the t of fusion area
8/5parameter.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109202320A (en) * | 2018-08-31 | 2019-01-15 | 西安理工大学 | The prediction and control method of welding section organization and performance during a kind of magnesium iron Repair Welding |
| CN109202321A (en) * | 2018-08-31 | 2019-01-15 | 西安理工大学 | The prediction and control method of welding section organization and performance during a kind of gray iron Repair Welding |
| CN111014906A (en) * | 2018-10-09 | 2020-04-17 | 天津大学 | Method for determining stress corrosion cracking resistance welding parameters of X65 pipeline steel by applying thermal simulation technology |
-
2013
- 2013-10-08 CN CN201310469006.9A patent/CN103530455A/en active Pending
Non-Patent Citations (4)
| Title |
|---|
| YONG-HUA SHI .ET AL: "Sensitivity model for prediction of bead geometry in underwater wet flux cored arc welding", 《TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA》 * |
| 李航: "水下湿法焊接过程温度场模拟和冶金行为分析", 《万方数据库》 * |
| 王颖: "城市高压燃气管道在役焊接冶金行为的模拟与分析", 《万方数据库》 * |
| 赵博等: "水深和流速对水下湿法焊接热过程影响的数值模拟", 《焊接学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109202320A (en) * | 2018-08-31 | 2019-01-15 | 西安理工大学 | The prediction and control method of welding section organization and performance during a kind of magnesium iron Repair Welding |
| CN109202321A (en) * | 2018-08-31 | 2019-01-15 | 西安理工大学 | The prediction and control method of welding section organization and performance during a kind of gray iron Repair Welding |
| CN111014906A (en) * | 2018-10-09 | 2020-04-17 | 天津大学 | Method for determining stress corrosion cracking resistance welding parameters of X65 pipeline steel by applying thermal simulation technology |
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Application publication date: 20140122 |