Numerical and experimental investigations of weld pool geometry in GTA welding of pure aluminum
来源期刊：中南大学学报(英文版)2014年第1期
论文作者：A. H. Faraji A. Bahmani M. Goodarzi S. H. Seyedein M. O. Shabani
文章页码：20 - 26
Key words：numerical model; GTA welding; pure aluminium; weld pool
Abstract: A 2-D numerical model was developed to predict the shape of weld pool in stationary GTA welding of commercial pure aluminium, without considering fluid flow in the weld pool. A Gaussian current density and heat input distribution on the surface of the workpiece were considered. The parameters of Gaussian distribution were modified by comparing calculated results with experimental ones. It was found that these distribution parameters are functions of applied current and arc length. Effects of arc length, applied current and welding time on the geometry of the weld pool were investigated. To check the validity of the model, a series of experiments were also conducted. In general, the agreement between calculated overall shape of the weld pool and the experimental one was acceptable, especially in low applied currents. Therefore, it can be concluded that in pure aluminium, the heat conduction is dominant mechanism of heat transfer in the weld pool.
A. H. Faraji1, A. Bahmani2, M. Goodarzi3, S. H. Seyedein3, M. O. Shabani4
(1. Young Researchers Club, Varamin-Pishva Branch, Islamic Azad University, Varamin 33817-7489, Iran;
2. Materilal Science and Engineering Department, Sharif University of Technology, Tehran 11365-11155, Iran;
3. Department of Metallurgy and Materials Engineering, Iran University of Science and Technology,
Tehran 16846-13114, Iran;
4. Materials and Energy Research Center (MERC), Tehran 131145-1659, Iran)
Abstract:A 2-D numerical model was developed to predict the shape of weld pool in stationary GTA welding of commercial pure aluminium, without considering fluid flow in the weld pool. A Gaussian current density and heat input distribution on the surface of the workpiece were considered. The parameters of Gaussian distribution were modified by comparing calculated results with experimental ones. It was found that these distribution parameters are functions of applied current and arc length. Effects of arc length, applied current and welding time on the geometry of the weld pool were investigated. To check the validity of the model, a series of experiments were also conducted. In general, the agreement between calculated overall shape of the weld pool and the experimental one was acceptable, especially in low applied currents. Therefore, it can be concluded that in pure aluminium, the heat conduction is dominant mechanism of heat transfer in the weld pool.
Key words:numerical model; GTA welding; pure aluminium; weld pool
