Authors: Dongsheng Wu Xueming Hua Dingjian Ye Xiaoli Ma Fang Li
Publish Date: 2016/04/22
Volume: 88, Issue: 1-4, Pages: 219-227
Abstract
A threedimensional numerical model is established to study the temperature and fluid flow fields in the twinwire gas metal arc welding GMAW process The highspeed photography system is used to capture the images of the weld pool during the welding Based on simulation and experimental results the weld pool formation convection and stability in twinwire GMAW process are investigated Both “pushpull” and outward flow patterns exist in the twinwire GMAW weld pool which can contribute to decreasing the height of the bulge and increasing the width of the pool The convection in the weld pool can proceed adequately the arc force between the leading and trailing arcs is relatively balanced surface tension normal force is uniform along the liquid channel and the liquid channel is capillary stable all of those contribute to the stability of the weld bead The simulation results are in good agreement with those in the experiment
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