CN103761374B - A kind of modeling method of Laser Deep Penetration Welding heat source model - Google Patents
A kind of modeling method of Laser Deep Penetration Welding heat source model Download PDFInfo
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- CN103761374B CN103761374B CN201410012392.3A CN201410012392A CN103761374B CN 103761374 B CN103761374 B CN 103761374B CN 201410012392 A CN201410012392 A CN 201410012392A CN 103761374 B CN103761374 B CN 103761374B
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- 238000003466 welding Methods 0.000 title claims abstract description 36
- 230000035515 penetration Effects 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 13
- 230000004927 fusion Effects 0.000 claims abstract description 6
- 238000003860 storage Methods 0.000 claims abstract description 5
- 238000005192 partition Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 241001076960 Argon Species 0.000 description 1
- 235000013876 argon Nutrition 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000001883 metal evaporation Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000649 photocoagulation Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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Abstract
The invention discloses a kind of modeling method of Laser Deep Penetration Welding heat source model, T connector physical model is established, when modeling considers weld metal zone material properties, and grid sequence partition problem builds weld metal zone for 3 individuals, bridge weld seam area, air film weld metal zone, core plate weld metal zone；Based on ANSYS, sequence grid division preferentially divides weld metal zone；Three-dimensional laser deep penetration welding heat source model is established, APDL is based on, solves unit calorific value, heat source model governing equation is：Wherein, x, y, z are cartesian coordinate, QMFor heat source peak value, r1Laser looks for the effective radius r in material surface2, H1For heat source form parameter, H0Heat source point height, H are the practical fusion penetration of weld seam, and heat source model solves calorific value in due order, in storage to array, are based on ANSYS softwares, will solve calorific value, be loaded into the corresponding units of finite element model, boundary condition is arranged, calculate and solve, complete modeling process.
Description
Technical field
The invention belongs to technical field of laser welding, more particularly to the modeling side of the heat source model of deep penetration welding in laser welding
Method.
Background technology
Laser welding is concentrated with energy, depth-to-width ratio is big, heat affected area is small, deformation is small, adaptable, welding quality is high
The advantages that.Therefore be used widely in industrial circle, especially automobile, ship, aerospace weight reduction process in have
Irreplaceable advantage.Laser welding can obtain larger depth-to-width ratio, so as to realize the deep penetration welding of T connector.Swash
Photocoagulation is related to the interaction of laser and material, keyhole effect, plasma effect, materials thermophysics attribute, welding pool
Heat transfer and mass transfer, etc. multivariables, multiple coupled phenomenon, the experimental study of system it is time-consuming, laborious.In reality, due to the office of laser
Portion is heated, and in molten bath and its neighbouring Reciprocity of Laser ＆ Materials, data can not possibly measure.So simulation is laser welding skill
Necessary information is obtained in art and predicts unique effective ways of welding temperature field distribution.
It is that welding value result is accurate, reliable premise to establish rational heat source model.Laser Deep Penetration Welding is come
It says, laser heat is concentrated, and power density is higher than 106W/cm2, aperture effect can be formed in very short time by metal evaporation
It answers.And aperture, similar to optical black matrix, the laser of injection is all absorbed after multiple reflections, and hereafter aperture is just as welding heat source
Equally realize welding process.
Invention content
The present invention is directed to the keyhole effect of simulated laser deep penetration welding and melting pool shapes.
The technical scheme is that a kind of modeling method of Laser Deep Penetration Welding heat source model, includes the following steps：
The first step, establishes T connector physical model, and when modeling considers weld metal zone material properties and grid sequence is drawn
Point problem builds weld metal zone for 3 individuals, bridge weld seam area, air film weld metal zone, core plate weld metal zone；
Second step, is based on ANSYS, and sequence grid division preferentially divides weld metal zone；
Third walks, and establishes three-dimensional laser deep penetration welding heat source model, is based on APDL, solves unit calorific value, heat source model
Governing equation is：
Wherein, x, y, z are cartesian coordinate, QMFor heat source peak value, r1Laser looks for the effective radius r in material surface2, H1
For heat source form parameter, H0Heat source point height, H are the practical fusion penetration of weld seam, and heat source model solves calorific value in due order, and storage is arrived
In array,
4th step is based on ANSYS softwares, will solve calorific value, is loaded into the corresponding units of finite element model, and perimeter strip is arranged
Part is calculated and is solved, and completes modeling process,
Laser welding formed temperature governing equation be：
Wherein ρ is mass density, and Cp specific heat capacities, T is temperature, and the t times, κ is the coefficient of heat conduction, and x, y, z is Descartes's seat
Mark, qLaserThe energy of laser heat source input,
The present invention establishes completely new Laser Deep Penetration Welding heat source model, can simulated laser deep penetration welding temperature field well.
Based on APDL, physical model is established, sequence grid division obtains finite element model；Heat source program code is write, heat is calculated
Value is stored in array；Boundary condition is set, calorific value is loaded, calculates and solves.Obtained T connector Laser Deep Penetration Welding temperature field with
Obtained result is tested to coincide well.It is compared compared with multi-heat source with used both at home and abroad in the past, shows that heat source of the present invention is more suitable
Close Laser Deep Penetration Welding.And fusion penetration is bigger, effect is more apparent.
Description of the drawings
Fig. 1 is the new pattern laser welding body heat source model of the present invention
Specific implementation mode
The specific implementation modeling procedure of the present invention：
The first step, establishes T connector physical model, and when modeling considers weld metal zone material properties and grid sequence is drawn
Point problem builds weld metal zone for 3 individuals, bridge weld seam area, air film weld metal zone, core plate weld metal zone.
Second step is based on ANSYS, sequence grid division.It is preferential to divide weld metal zone.
Third walks, and establishes three-dimensional laser deep penetration welding heat source model, is based on APDL, solves unit calorific value.
Heat source model governing equation is：
Wherein, x, y, z are cartesian coordinate, QMFor heat source peak value, r1Laser looks for the effective radius r in material surface2, H1
For heat source form parameter, H0Heat source point height, H are the practical fusion penetration of weld seam, and heat source model solves calorific value in due order, and storage is arrived
In array.
4th step is based on ANSYS softwares, will solve calorific value, is loaded into the corresponding units of finite element model, and perimeter strip is arranged
Part is calculated and is solved, and completes modeling process.
Laser welding formed temperature governing equation be：
Wherein ρ is mass density, and Cp specific heat capacities, T is temperature, and the t times, κ is the coefficient of heat conduction, and x, y, z is Descartes's seat
Mark, qLaserThe energy of laser heat source input.As shown in Figure 1, being the new pattern laser welding body heat source model of the present invention.
The experimental verification process of the present invention, the welding condition of selection are laser power Q=4500W, welding speed V=
25mm/s, laser induced plasma flow field are η=0.9, and heat source model is in effective light spot radius r0=0.7mm of material surface, heat source mould
Type height H=5.3mm, protective gas select Pure argons, 20L/min.
The use of material is 304L stainless steels, fusing point is 1450 DEG C, and boiling point is 2800 DEG C.
Using IPG YLS-5000 type lasers, KUKA KR60HA six-joint robots implement weldering
It connects.
Based on ANSYS secondary exploitation technologies, parametric modeling, the hot entity lists of solid70 of we selected typical are realized
Member, using non-homogeneous partitioning technology grid division；Using storage of array and Vector operation, realize that parametrization load solves.
Finally, using domestic and international common heat source model, T-type is simulated using same algorithm using same computer
Connector Laser Deep Penetration Welding.
The present invention can get better molten wide, fusion penetration compared with domestic and international common heat source, and melting pool shape and experiment weld seam are more
It coincide.
Claims (1)
1. a kind of modeling method of Laser Deep Penetration Welding heat source model, which is characterized in that include the following steps：
The first step, establishes T connector physical model, and when modeling considers weld metal zone material properties and grid sequence is divided and asked
Topic builds weld metal zone for 3 individuals, bridge weld seam area, air film weld metal zone, core plate weld metal zone；
Second step, is based on ANSYS, and sequence grid division preferentially divides weld metal zone；
Third walks, and establishes three-dimensional laser deep penetration welding heat source model, is based on APDL, solves unit calorific value, heat source model control
Equation is：
Wherein, x, y, z are cartesian coordinate, QMFor heat source peak value, r1Laser looks for the effective radius r in material surface2, H1For heat source
Form parameter, H0Heat source point height, H are the practical fusion penetration of weld seam, and heat source model solves calorific value in due order, and array is arrived in storage
In,
4th step is based on ANSYS softwares, will solve calorific value, is loaded into the corresponding units of finite element model, and boundary condition is arranged,
It calculates and solves, complete modeling process,
Laser welding formed temperature governing equation be：
Wherein ρ is mass density, and Cp specific heat capacities, T is temperature, and the t times, κ is the coefficient of heat conduction, and x, y, z is cartesian coordinate,
qLaserThe energy of laser heat source input.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105550434B (en) * | 2015-12-10 | 2018-08-03 | 南车株洲电力机车有限公司 | A kind of locomotive car body lightweight optimization method |
| CN105718690A (en) * | 2016-01-26 | 2016-06-29 | 南京航空航天大学 | Laser 3D printing molten bath solidification behavior numerical simulation method based on time and space active tracking |
| CN106670666A (en) * | 2016-12-14 | 2017-05-17 | 南京航空航天大学 | Construction method of energy distribution coefficient model of laser-electric-arc combined machining based on precise energy distribution |
| CN107649804B (en) * | 2017-10-17 | 2023-06-23 | 华中科技大学鄂州工业技术研究院 | Online detection and control system for penetration of additive manufacturing |
| CN109522610A (en) * | 2018-10-25 | 2019-03-26 | 南京航空航天大学 | A kind of weld metal zone mixing crystalline region finite element modeling method |
| CN109933007A (en) * | 2019-01-30 | 2019-06-25 | 中国科学院金属研究所 | A kind of method for building up of Laser-MIG Composite Welding heat source model |
| CN112496614B (en) * | 2020-12-17 | 2022-09-13 | 上海工程技术大学 | Method for obtaining finite element simulation heat source model of deep fusion welding |
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2014
- 2014-01-10 CN CN201410012392.3A patent/CN103761374B/en not_active Expired - Fee Related
Non-Patent Citations (4)
| Title |
|---|
| T型接头焊接温度场与应力场的数值模拟;毕艳霞;《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑（月刊）》;20080615;第2008年卷(第6期);第B022-91页摘要 * |
| 激光深熔焊接热源模型的研究进展;熊智军 等;《焊接》;20061231(第12期);第12-16页第2节 * |
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