Method for simulating dendritic crystal growth of laser welding pool

A simulation method and laser welding technology, applied in laser welding equipment, welding equipment, instruments, etc., can solve problems such as prediction of laser welding molten pool solidification process

Inactive Publication Date: 2017-11-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

But there is still no systematic solution to completely predict the solidification process of the laser welding molten pool

Method used

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  • Method for simulating dendritic crystal growth of laser welding pool
  • Method for simulating dendritic crystal growth of laser welding pool
  • Method for simulating dendritic crystal growth of laser welding pool

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Embodiment Construction

[0051] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.

[0052] As shown in the figure, a method for simulating dendritic growth in a laser welding pool of the present invention includes the following steps:

[0053] Step 1: Simplify conditions and model initialization;

[0054]In order to ensure the computability of the model, some assumptions were made in the process of building the model: cogeneration crystallization will occur at the fusion line of the weld pool, which is equivalent to the directional solidification process, so the initial state of the calculation is assumed to be a planar crystal form. The effect of latent heat on the dendrite growth process was ignored in the simulation calculation. A phase field parameter is introduced, and the change of this para...

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Abstract

The invention discloses a method for simulating dendritic crystal growth of a laser welding pool. The method is characterized by comprising the following steps of 1, simplifying conditions and initializing a microcosmic model; 2, establishing a macroscopic model of the temperature gradient and propulsion speed; 3, establishing a phase-field model of dendritic crystal growth; 4, carrying out macroscopic-microcosmic coupling calculation; and 5, carrying out analog computation and exporting results. According to the method, the simulation of the dendritic crystal growth and evolution in the solidification process of the laser welding pool can be quantitatively carried out, the dendritic crystal growth process in the solidification process of the laser welding pool can be dynamically reproduced, so that deepening understanding of the microstructure evolution mechanism of the laser welding pool is facilitated, and a foundation is laid for researching the solidification process of the laser welding pool and optimizing the welding process.

Description

technical field [0001] The invention relates to a dendrite growth simulation method, in particular to a laser welding molten pool dendrite growth simulation method. Background technique [0002] Compared with traditional arc welding technology, laser welding technology has the advantages of high welding energy, fast welding speed, small welding heat-affected zone, and large welding depth-to-width ratio. It has been widely used in aerospace and other fields. The performance of laser welded joints depends not only on its macroscopic defects, but also on factors such as grain size and internal structure. The dendrite growth process in the laser weld pool is complex and affected by many factors. Therefore, the study of dendrite growth process in laser welding pool is a complex and important field. In this field of research, numerical simulation is playing an increasingly important role. [0003] Traditional research is mostly based on test data and experience. Not only does t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/00G06F17/50
CPCB23K26/0006G06F30/20
Inventor 魏艳红王磊刘仁培曹熙勇余枫怡
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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