CN106940747A - A kind of PE electric melting pipe fittings welding condition formulating method - Google Patents
A kind of PE electric melting pipe fittings welding condition formulating method Download PDFInfo
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- CN106940747A CN106940747A CN201710160935.XA CN201710160935A CN106940747A CN 106940747 A CN106940747 A CN 106940747A CN 201710160935 A CN201710160935 A CN 201710160935A CN 106940747 A CN106940747 A CN 106940747A
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- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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Abstract
The present invention relates to a kind of PE electric melting pipe fittings welding condition formulating method, comprise the following steps：（1）The 3 d structure model that electric melting pipe fittings coordinate with pipe is set up in Pro/Engineer；（2）3 d structure model is imported in ANSYS WORKBENCH, electrothermal forces multiple physical field coupling model is set up；（3）Set Thermal Parameter, mechanics parameter and the electrical parameter of associated materials（4）Primarily determine that PE electric melting pipe fittings weldingvoltages；（5）According to step（4）The weldingvoltage and actual conditions setting model electric field, temperature field, field of force load of middle determination；（6）The classified types and size of mesh opening of setting model grid, then grid division；（7）Load load time and step-length are set, is solved；（8）Extract solving result and determine welding condition.The present invention improves the accuracy for judging welding degree, it is ensured that PE electric melting pipe fittings and the welding quality at joint for pipe, improves the accuracy for formulating electric melting pipe fittings welding condition, reduces the energy waste of welding process.
Description
Technical field
The present invention relates to a kind of PE electric melting pipe fittings welding condition formulating method.
Background technology
The main body of PE electric melting pipe fittings is polythene material sleeve, and the resistance wire of spiral winding, resistance are embedded with sleeve lining
Silk two is terminated with binding post, stretches out the terminals of sleeve two and is accessed for electro-fusion welding machine.Electric fusion welding refers to two pipes that need to will be welded
End is inserted in electric melting pipe fittings and is fitted close, and the binding post of electric melting pipe fittings two is powered using electro-fusion welding machine, resistance wire is caused
Joule effect is produced, regulation conduction time accumulation heat makes temperature reach polyvinyl piping materials fusing point, tube outer wall and pipe fitting inner wall
Melting dilation, because the pressure between pipe and pipe fitting causes fusion zone mutually to be merged, stops being powered after gradually cooling, pipe just leads to
Pipe fitting is crossed to link together.Electric fusion welding is the major way of PE pipelines connection.
The formulation of existing electric melting pipe fittings welding condition mainly has two ways：The first is true by soldering test
It is fixed, i.e., tested, every kind of collocation mode welding result is connect by attempting different welding condition collocation then
Peel test is to examine welding quality at head, so as to choose the best welding parameter of effect.The shortcoming of this method is to expend
Test material, test period length, labor intensive.The second way is the Thermal Parameter according to material, using numerical analysis or
FEM model simulates the electric fusion welding component internal temperature field situation in welding process, according to judging whether internal temperature reaches
Welding condition, such as patent CN201310749560.2 are determined to experience welding requirements.This method saves manpower wealth
The power time, but welding process is only judged by temperature field, it is impossible to judge because local and silk causes temperature quickly to raise and carries
Before situations such as reach welding temperature situation or cross weldering, and during actual welding construction, often useful model pipe fitting of the same race coordinates different
The situation that model pipe is welded, only with judging whether temperature field reaches the welding situation that fusing standard coordinates in different gap
Under not can determine that whether pipe fitting merges with the molten slurry of pipe, factor of judgment is single, causes judged result accuracy to substantially reduce.
The content of the invention
The technical problems to be solved by the invention are：A kind of PE electric melting pipe fittings welding condition formulating method is provided, should
Method coordinates 3D models by setting up electric melting pipe fittings, pipe, using ANSYS softwares to coordinating model to carry out many physics of electric-thermal-power
Electric heating conversion output, joint temperature field, welding region radial shape in field coupling Simulation, comprehensive analysis electric melting pipe fittings welding process
Variable formulates PE electric melting pipe fittings welding conditions.
In order to realize the invention described above purpose, the technical scheme is that：A kind of PE electric melting pipe fittings welding condition
Formulating method, including following steps connected in order：
（1）The 3 d structure model that electric melting pipe fittings coordinate with pipe is set up in Pro/Engineer；
（2）3 d structure model is imported in ANSYS WORKBENCH, electric-thermal-power multiple physical field coupling model is set up；
（3）Set associated materials Thermal Parameter, mechanics parameter and electrical parameter, wherein Thermal Parameter include thermal conductivity,
Density, specific heat capacity, thermal coefficient of expansion, mechanics parameter include Poisson's ratio, Young's modulus, and electrical parameter includes resistivity；
（4）Primarily determine that the weldingvoltage of PE electric melting pipe fittings；
（5）According to step（4）The energization load of resistance wire, sets pipe fitting appearance in the weldingvoltage setting electric melting pipe fittings of middle determination
Face and the convection coefficient of inner surface of tube, set PE materials enthalpy of phase change, setting pipe fitting and pipe it is symmetrical by force constraint；
（6）The classified types and size of mesh opening of setting model grid, then grid division；
（7）Load load time and step-length are set, is solved；
（8）Extract solving result and determine welding condition.
Preferably, step（4）In, the method for determining the weldingvoltage of PE electric melting pipe fittings is：Used according to pipe fitting model
Usual constant pressure weldingvoltage in industry, usually 39.5V.
Preferably, the phase transition temperature of PE electric melting pipe fittings is 132 DEG C, step（5）Addition phase transformation enthalpy load method be
APDL is programmed, and the method for determining enthalpy is：
Propose that the phase transformation that 5 DEG C are defined between 135 DEG C of 130 DEG C ~ liquid temperature of PE solid state temperatures is interval, enthalpy computing formula is：
Wherein H is heat content, and unit is J, and T is temperature, unit for DEG C, ρ is density, and unit is kg/m3, Tr is reference temperature, single
Position for DEG C, C is specific heat capacity, and unit is J/（kg·℃）.
Preferably, step（2）Middle multiple physical field coupling order is：First with electricity mould in ANSYS WORKBENCH
Block asks for resistance wire heater product power, and electrical result then is imported into calorifics module solves temperature field mould as load-up condition
Type, finally solves mechanical model using temperature field result guiding structure mechanics module as load-up condition.
Preferably, PE pipe fitting weldings temperature is 160 DEG C ~ 250 DEG C, welding depth is 1.5mm ~ 2mm, to step（8）Carry
The solving result taken is analyzed, when electric melting pipe fittings welding area temperature falls in the range of 160 DEG C ~ 250 DEG C, and pipe fitting radial shape
Change reaches 1.5mm ~ 2mm, and it is welding required time to determine the model emulation time, otherwise readjusts welding condition continuation
Carry out emulation solution.
After adopting the above technical scheme, the effect of the present invention is：The present invention is initially set up at electric melting pipe fittings and joint for pipe
Three-dimensional simplified, imitated after then carrying out electric-thermal-power multiple physical field coupling model, setting weldingvoltage using ANSYS softwares
Electric heating conversion output in true analysis electric melting pipe fittings welding process, joint temperature field, welding region radial deformation formulate PE
Electric melting pipe fittings welding condition, not only increases the accuracy for judging welding degree, it is ensured that PE electric melting pipe fittings and joint for pipe
The welding quality at place, also improves the accuracy for formulating electric melting pipe fittings welding condition, reduces the energy waste of welding process, has
Effect reduces cold welding and crosses the generation of weldering.
Brief description of the drawings
The present invention is further described with simulation example below in conjunction with the accompanying drawings.
Fig. 1 is that the specific heat capacity of PE materials varies with temperature figure.
Fig. 2 is that the thermal conductivity of PE materials varies with temperature figure.
Fig. 3 is that the thermal coefficient of expansion of PE materials varies with temperature figure.
Fig. 4 is that the Young's modulus of PE materials varies with temperature figure.
Fig. 5 is that the Poisson's ratio of PE materials varies with temperature figure.
Fig. 6 is the moulding figure after simplifying to electric melting pipe fittings, pipe：
1：Pipe fitting, 2：Resistance wire, 3：Pipe.
Fig. 7 is Fig. 6 mesh generation.
Fig. 8 is electric melting pipe fittings, tube welding process temperature emulation gradient map：
Mark is temperature value, unit DEG C in figure.
Fig. 9 is electric melting pipe fittings, tube welding process radial direction deformation map.
Marked in figure：4- radial direction equi-deformation curves.
Figure 10 is electric melting pipe fittings, tube welding process temperature and radial direction deformation complex numerically curve map.
Embodiment
Below by specific simulation example, the present invention is described in further detail.
（1）This example is with dn400（SDR17）Exemplified by through-type electric melting pipe fittings, electric smelting pipe is set up in Pro/Engineer
The 3 d structure model that part 1, resistance wire 2, pipe 3 coordinate, is simplified model, the 1/ of side joint is only set up according to symmetry
6 circle configurations, moulding such as Fig. 6.
（2）3 d structure model is imported in ANSYS WORKBENCH, electric-thermal-power multiple physical field coupling model is set up,
Multiple physical field coupling order be：Resistance wire heater product power is asked for first with electrical module in ANSYS WORKBENCH, so
Electrical result is imported into calorifics module afterwards and solves models for temperature field as load-up condition, finally by temperature field result guiding structure power
Learn module and solve mechanical model as load-up condition.
（3）Thermal Parameter, mechanics parameter and the electrical parameter of associated materials are set, wherein Thermal Parameter includes heat conduction
Rate, density, specific heat capacity, thermal coefficient of expansion, mechanics parameter include Poisson's ratio, Young's modulus, and electrical parameter includes resistivity；Material
Physical function parameter is obtained by material related experiment, and material mainly has H65 copper wires and PE100 polyethylene in this example, wherein
H65 density is 8470kg/m3, specific heat capacity is 385 J/ (kg DEG C), and thermal conductivity is 116.7W/ (m DEG C), and resistivity is
0.076 μ Ω m, PE100 density is 960kg/m3, PE100 other performance parameter is changed over time, as shown in accompanying drawing 1-5.
（4）Initial weld voltage, this example dn400 are set according to electric melting pipe fittings concrete model（SDR17）Through-type electric smelting
Pipe fitting welding voltage is 39.5V, and weld interval is 2040 seconds.
（5）According to step（4）The energization load of resistance wire, sets pipe fitting in the weldingvoltage setting electric melting pipe fittings of middle determination
Outer surface and the convection coefficient of inner surface of tube, set PE materials enthalpy of phase change, setting pipe fitting and pipe it is symmetrical by force constraint；
Wherein the outer surface convection coefficient of pipe fitting 1 is 12W/m2DEG C, the inner surface convection coefficient of pipe 3 is 8W/m2DEG C, PE material phase transformations
Enthalpy programs assignment, pipe fitting 1, resistance wire 2 by APDL, and all interfaces produced due to model simplification of pipe 3 are all set to pair
Claim by force constraint.
（6）The classified types and size of mesh opening of setting model grid, then grid division；Threedimensional model is carried out certainly first
Dynamic mesh is divided, and then carrying out size of mesh opening to the inner surface of pipe fitting 1, the outer surface of pipe 3 refines, the two face cell chis
It is very little to be at least refined as the 1/3 of pitch, mesh generation figure such as Fig. 7.
（7）Load load time and step-length are set, is solved；Simulation analysis set of time is 2040 seconds, and step-length passes through setting
Interval allows software to be automatically selected according to calculating, and it is 10 seconds that step-length interval is selected in this example.
（8）Extract solving result and determine welding condition.See that accompanying drawing 8 and radial direction deformation map are shown in attached by thermograde
Fig. 9, draws temperature variation curve and radial direction inflection curves as shown in Figure 10, analyzes simulation result：
PE pipe fitting weldings preferable temperature is 160 DEG C ~ 250 DEG C, and welding preferred depth is 1.5mm ~ 2mm, when electric melting pipe fittings welding area
Domain temperature falls in the range of 160 DEG C ~ 250 DEG C, and pipe fitting radial direction deformation reaches 1.5mm ~ 2mm, determines the side of optimal weld interval
Method is：Selected in preferable temperature region and preferred pipe fitting radial direction deformation region corresponding to temperature curve and the intersection point of inflection curves
Time, the time required to determining that the model emulation time is welding, otherwise readjust voltage in welding condition or
Weld interval proceeds emulation and solved.It can be determined in this example in the case where 39.5V constant pressures are welded, optimal weld interval
For 1900 seconds.
Claims (5)
1. a kind of PE electric melting pipe fittings welding condition formulating method, it is characterised in that：Including following steps connected in order：
（1）The 3 d structure model that electric melting pipe fittings coordinate with pipe is set up in Pro/Engineer；
（2）3 d structure model is imported in ANSYS WORKBENCH, electric-thermal-power multiple physical field coupling model is set up；
（3）Set associated materials Thermal Parameter, mechanics parameter and electrical parameter, wherein Thermal Parameter include thermal conductivity,
Density, specific heat capacity, thermal coefficient of expansion, mechanics parameter include Poisson's ratio, Young's modulus, and electrical parameter includes resistivity；
（4）Primarily determine that the weldingvoltage of PE electric melting pipe fittings；
（5）According to step（4）The energization load of resistance wire, sets pipe fitting appearance in the weldingvoltage setting electric melting pipe fittings of middle determination
Face and the convection coefficient of inner surface of tube, set PE materials enthalpy of phase change, setting pipe fitting and pipe it is symmetrical by force constraint；
（6）The classified types and size of mesh opening of setting model grid, then grid division；
（7）Load load time and step-length are set, is solved；
（8）Extract solving result and determine welding condition.
2. a kind of PE electric melting pipe fittings welding condition formulating method as claimed in claim 1, it is characterised in that：Step（4）
In, the method for determining the weldingvoltage of PE electric melting pipe fittings is：According to pipe fitting model using usual constant pressure weldingvoltage in industry, lead to
It is often 39.5V.
3. a kind of PE electric melting pipe fittings welding condition formulating method as claimed in claim 2, it is characterised in that：PE electric smelting pipes
The phase transition temperature of part is 132 DEG C, step（5）Add the method for phase transformation enthalpy load to program for APDL, the method for determining enthalpy is：
Propose that the phase transformation that 5 DEG C are defined between 135 DEG C of 130 DEG C ~ liquid temperature of PE solid state temperatures is interval, enthalpy computing formula is：
Wherein H is heat content, and unit is J, and T is temperature, unit for DEG C, ρ is density, and unit is kg/m3, Tr is reference temperature, unit
For DEG C, C is specific heat capacity, and unit is J/（kg·℃）.
4. a kind of PE electric melting pipe fittings welding condition formulating method as claimed in claim 3, it is characterised in that：Step（2）
Middle multiple physical field coupling order is：Resistance wire heater product power is asked for first with electrical module in ANSYS WORKBENCH,
Then electrical result is imported into calorifics module and solves models for temperature field as load-up condition, finally by temperature field result guiding structure
Mechanics module solves mechanical model as load-up condition.
5. a kind of PE electric melting pipe fittings welding condition formulating method as claimed in claim 4, it is characterised in that：PE pipe fittings are welded
Jointing temp is 160 DEG C ~ 250 DEG C, and welding depth is 1.5mm ~ 2mm, to step（8）The solving result of extraction is analyzed, and works as electricity
Fusion tube part welding area temperature falls in the range of 160 DEG C ~ 250 DEG C, and pipe fitting radial direction deformation reaches 1.5mm ~ 2mm, determines model
The time required to simulation time is welding, otherwise readjusts welding condition and proceed emulation solution.
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| CN201710160935.XA CN106940747A (en) | 2017-03-17 | 2017-03-17 | A kind of PE electric melting pipe fittings welding condition formulating method |
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| CN201710160935.XA CN106940747A (en) | 2017-03-17 | 2017-03-17 | A kind of PE electric melting pipe fittings welding condition formulating method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108646689A (en) * | 2018-06-12 | 2018-10-12 | 中车青岛四方机车车辆股份有限公司 | A kind of virtual method for manufacturing and system based on welding |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103745053A (en) * | 2013-12-31 | 2014-04-23 | 江苏双腾管业有限公司 | PE electric smelting pipe fitting welding parameter setting method based on finite elements |
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- 2017-03-17 CN CN201710160935.XA patent/CN106940747A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103745053A (en) * | 2013-12-31 | 2014-04-23 | 江苏双腾管业有限公司 | PE electric smelting pipe fitting welding parameter setting method based on finite elements |
Non-Patent Citations (2)
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| 姜婷婷: "高密度聚乙烯管道热熔焊数值模拟及工艺优化研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅰ辑（月刊）》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108646689A (en) * | 2018-06-12 | 2018-10-12 | 中车青岛四方机车车辆股份有限公司 | A kind of virtual method for manufacturing and system based on welding |
| CN108646689B (en) * | 2018-06-12 | 2020-04-14 | 中车青岛四方机车车辆股份有限公司 | Virtual production manufacturing method and system based on welding |
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Application publication date: 20170711 |