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A Method of Establishing Heat Source Model for Laser-arc Hybrid Welding

A heat source model and composite welding technology, applied in laser welding equipment, welding equipment, 3D modeling, etc., can solve the problems of difficult secondary development of heat source models, difficult to popularize and apply, etc., to shorten the test period and reduce the difficulty of engineering application. , reduce the effect of useless work

Inactive Publication Date: 2019-02-01
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the technical status quo in which the secondary development of the heat source model in the current laser-arc hybrid welding simulation is difficult, it is not easy to popularize and apply, and there is a large deviation between the simulation results of a single heat source and the actual situation, the invention provides a laser-arc hybrid welding heat source model establishment method to address the above existing deficiencies

Method used

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  • A Method of Establishing Heat Source Model for Laser-arc Hybrid Welding

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Embodiment 1

[0038] Embodiment 1: A method for establishing a laser-arc hybrid welding heat source model

[0039] In order to realize the purpose of the present invention, the present invention adopts the Nd:YAG laser-MIG electric arc compound welding method to carry out the test, the laser is a continuous laser, and according to the test requirements, a high-power fiber laser and a digital pulse MIG welding gun are used to cooperate to achieve the purpose of compound welding; KUKA The robot completes the movement of the heat source, and the CNC workbench controls the movement of the workpiece; according to the test requirements, a welding fixture is designed to fix the workpiece to complete the welding, thus providing a method for establishing a heat source model for laser-arc hybrid welding. The specific steps are as follows:

[0040] (1) Establish a three-dimensional finite element mesh model:

[0041] First, establish the geometric model of the workpiece in the 3D modeling software, an...

Embodiment 2

[0060] Example 2: Effect verification experiment of a method for establishing a laser-arc hybrid welding heat source model

[0061] In this embodiment, laser-arc hybrid welding is used to carry out overlay welding on the surface of Q345D steel plate, and the welding wire is 304 stainless steel welding wire. The specific steps are as follows:

[0062] (1) Establish a three-dimensional finite element mesh model:

[0063] The geometric model of the workpiece is established by 3D modeling software, and then imported into the meshing software for meshing. The meshing uses hexahedral elements, and at the same time adopts a division method that is dense near the weld and sparse away from the weld. The total number of volume nodes is 39325, the total number of units is 34560.

[0064] (2) Import the grid model into Simufact.welding software to establish a heat source model:

[0065] Adopt a kind of establishment method of laser-arc hybrid welding heat source model provided by the pr...

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Abstract

The invention discloses a method for establishing a heat source model for laser-arc hybrid welding, By establishing the geometric model of the workpiece and meshing the geometric model, the welding heat source model is established by adopting the method of fine meshing near the welding seam and coarse meshing far away from the welding seam, considering the material properties, loading the laser volume and Goldak combination of heat source, setting the boundary conditions of the model, and calculating and solving. Comparing the simulated welding seam cross-sectional morphology with the actual welding seam cross-sectional morphology, the similarity between the simulated welding seam cross-sectional morphology and the actual laser-composite welding seam cross-sectional morphology reaches morethan 91%, and the laser-composite welding seam cross-sectional morphology can be solved. In the simulation of arc hybrid welding, it is difficult to redevelop the heat source and to apply it in engineering practice.

Description

technical field [0001] The invention mainly belongs to the technical field of welding, and specifically relates to the technical field of a method for establishing a compound welding heat source model. Background technique [0002] Laser-arc hybrid welding has the characteristics of large penetration depth of laser welding and low assembly accuracy requirements of ordinary arc welding. Compared with single laser welding and single arc welding, it has great advantages, and is suitable for welding of various materials. There are a wide range of applications in industries such as manufacturing, automobiles, ships, and transportation rails. At present, physical experiments are often used to study welding of the same dissimilar materials. In the experimental process, laser-arc hybrid welding has many process parameters. The cost of researching the welding process only by physical experiments is relatively large, and at the same time it consumes a huge time cost. Moreover, the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06T17/20B23K26/348
CPCB23K26/348G06T17/20G06F30/23
Inventor 杨眉王丹黄婷玉刘伟刘洋
Owner SOUTHWEST PETROLEUM UNIV
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