A New Model for Simulating Gas Metal Arc Welding based on Phase Field Model

2017 4th International Conference on Advanced Materials, Mechanics and Structural Engineering

材料科学;机械制造

Jiang, Yongyue^1,2 ; Li, Li^1 ; Zhao, Zhijiang^1

Beijing Time Technologies Co. Ltd., Kaituo Road 17, Beijing

100085, China^1

School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing

100083, China^2

关键词: Electromagnetic forces;    Gas metal arc welding (GMAW);    Heat and mass transfer;    Momentum equation;    Multiphase fluids;    Phase field models;    Thermocapillary effect;    Volume of fluid method;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/269/1/012069/pdf
DOI  :  10.1088/1757-899X/269/1/012069

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Lots of physical process, such as metal melting, multiphase fluids flow, heat and mass transfer and thermocapillary effect (Marangoni) and so on, will occur in gas metal arc welding (GMAW) which should be considered as a mixture system. In this paper, based on the previous work, we propose a new model to simulate GMAW including Navier-Stokes equation, the phase field model and energy equation. Unlike most previous work, we take the thermocapillary effect into the phase field model considering mixture energy which is different of volume of fluid method (VOF) widely used in GMAW before. We also consider gravity, electromagnetic force, surface tension, buoyancy effect and arc pressure in momentum equation. The spray transfer especially the projected transfer in GMAW is computed as numerical examples with a continuous finite element method and a modified midpoint scheme. Pulse current is set as welding current as the numerical example to show the numerical simulation of metal transfer which fits the theory of GMAW well. From the result compared with the data of high-speed photography and VOF model, the accuracy and stability of the model and scheme are easily validated and also the new model has the higher precieion.