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Two-dimensional computer simulation method for air hole forming and evolution in welding process

A technology of welding process and simulation method, applied in the direction of calculation, special data processing application, instrument, etc., can solve problems such as the formation and evolution of pores in welded joints that cannot be considered

Inactive Publication Date: 2016-07-06
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] However, most of these studies are aimed at pure metals, binary alloys or simple multi-element alloys, and mainly study the transformation between solid and liquid phases. The second phase particles and gases are simplified, and the pores in welded joints cannot be considered. process of formation and evolution

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  • Two-dimensional computer simulation method for air hole forming and evolution in welding process
  • Two-dimensional computer simulation method for air hole forming and evolution in welding process
  • Two-dimensional computer simulation method for air hole forming and evolution in welding process

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Embodiment Construction

[0092] The invention will be described in further detail below in conjunction with the accompanying drawings.

[0093] Aiming at the solidification process of weld pool, a two-dimensional computer simulation method for the formation and evolution of pores was proposed. This method is based on the cellular automaton method to simplify the simulation conditions, establish a microstructure evolution model, and establish a stomatal nucleation and evolution model. The two models are coupled and superimposed and the state, time and area are discretized. Calculation, update and export of calculation results and then cycle until the calculation is completed. Such as figure 1 As shown, it mainly includes the following steps:

[0094] Step 1: Simplify conditions and model initialization

[0095] In order to ensure computability, the following assumptions are made when establishing the computer model: the gas in the bubble is an ideal gas; the molten liquid is an incompressible fluid;...

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Abstract

The invention discloses a two-dimensional computer simulation method for air hole forming and evolution in welding process, and belongs to the technical field of numerical simulation in welding process. The method comprises the following steps: firstly carrying out simplification and model initialization on the physical condition; establishing a microstructure evolution model and an air hole forming and evolution model, and coupling the two models; and compiling a computer program on the basis of the coupled model to carry out computation, so as to obtain simulation results such as a microstructure and air hole coupled evolution process, a solute concentration field, a dendritic crystal and air hole evolution speed and the like. According to the method, dendritic crystal growth evolution simulation can be carried out in the welding pool solidification process, so that the structural form change of the welding cooling process is dynamically reproduced, and the welding air hole forming and evolution process can be deeply understood.

Description

technical field [0001] The invention relates to a two-dimensional computer simulation method for the formation and evolution of pores in the welding process, and belongs to the technical field of numerical simulation of the welding process. Background technique [0002] Porosity is one of the most likely defects in the welding process, especially the key factor affecting the performance of welded joints. The existence of pores not only reduces the effective load-bearing area of ​​the weld, but also forms stress concentration, which reduces the strength, toughness, and fatigue strength of the weld. In some special cases, the pores can also become the source of cracks. As a high-temperature, transient, nonlinear thermal processing process, welding has unique complexity and irreversibility. At the same time, the generation of pores is closely related to the microstructure evolution during the solidification of the weld pool. However, the weld pool The microstructure evolution ...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 魏艳红辜诚占小红
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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