In this work, a pulsed welding process is investigated to highlight how a time-varying profile of current impacts the metal transfer dynamics. First, the process is recorded using a high-speed camera, allowing us to qualitatively evaluate the effectiveness of metal transfer and the synchronization of droplet detachment with current peaks. Second, a time-dependent axisymmetric 2D model is developed to take into account both the droplet detachment using a volume-of-fluid model and the production and diffusion of metal vapour through a simplified diffusion model (neglecting demixing effects). We report a comparison between experimental and simulative results of a pulsed transfer mode for a steel wire (=1mm) and Ar shielding gas.
M Boselli, V Colombo, E Ghedini, M Gherardi, P Sanibondi (2012). Dynamic analysis of droplet transfer in gas–metal arc welding: modelling and experiments. PLASMA SOURCES SCIENCE & TECHNOLOGY, 21(5), 1-6 [10.1088/0963-0252/21/5/055015].
Dynamic analysis of droplet transfer in gas–metal arc welding: modelling and experiments
BOSELLI, MARCO;COLOMBO, VITTORIO;GHEDINI, EMANUELE;GHERARDI, MATTEO;SANIBONDI, PAOLO
2012
Abstract
In this work, a pulsed welding process is investigated to highlight how a time-varying profile of current impacts the metal transfer dynamics. First, the process is recorded using a high-speed camera, allowing us to qualitatively evaluate the effectiveness of metal transfer and the synchronization of droplet detachment with current peaks. Second, a time-dependent axisymmetric 2D model is developed to take into account both the droplet detachment using a volume-of-fluid model and the production and diffusion of metal vapour through a simplified diffusion model (neglecting demixing effects). We report a comparison between experimental and simulative results of a pulsed transfer mode for a steel wire (=1mm) and Ar shielding gas.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
