Authors: Mouhamadou A. Diop, Chen Xiaomeng and Mohamed I. Hassan
Abstract: In aluminum smelters, DC current used in aluminum production generates high magnetic field in the environment of aluminum electrolysis pots that affects the welding process and its efficiency. These magnetic fields may cause instabilities in the welding arc and welding pool which are responsible for lack of fusion, porosity and unevenly welded joints. An external magnetic field deflects the arc by electromagnetic force created by the interaction of the welding arc current and the magnetic field. The purpose of the present work is to develop a computational model of the weld pool for both stationary and moving torch Gas Tungsten Arc Welding (GTAW) in the magnetic field of an aluminum smelter. The predictive three-dimensional weld pool workbench model evaluates the effects of the external field on the efficiency of welding. The aim of this study is to simulate a realistic representation of Narrow-Gap Horizontal position (NGH-GTAW) situation in order to identify the impact of electromagnetic force field on the resulting weld shapes in aluminum smelters.
Keywords: Welding in magnetic field; threedimensional, welding models; welding in aluminum, smelter potrooms.