In this work, a pulsed welding process has been investigated to highlight how a time varying profile of current impacts on the metal transfer dynamics. First, the process has been recorded using high-speed camera, allowing to qualitatively evaluate the effectiveness of metal transfer and the synchronization of the droplet detachment with current peaks. Second, a time-dependent axi-symmetric 2-D model has been developed in the FLUENT environment to take into account both the droplet detachment using a volume of fluid (VoF) 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 (d = 1 mm) and an Ar shielding gas.
Titolo: | Dynamic analysis of metal transfer in GMAW: modeling and experiments | |
Autore/i: | BOSELLI, MARCO; COLOMBO, VITTORIO; GHEDINI, EMANUELE; SANIBONDI, PAOLO | |
Autore/i Unibo: | ||
Anno: | 2011 | |
Titolo del libro: | Proceedings of the International Symposium on Plasma Chemistry 20 | |
Pagina iniziale: | 1 | |
Pagina finale: | 4 | |
Abstract: | In this work, a pulsed welding process has been investigated to highlight how a time varying profile of current impacts on the metal transfer dynamics. First, the process has been recorded using high-speed camera, allowing to qualitatively evaluate the effectiveness of metal transfer and the synchronization of the droplet detachment with current peaks. Second, a time-dependent axi-symmetric 2-D model has been developed in the FLUENT environment to take into account both the droplet detachment using a volume of fluid (VoF) 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 (d = 1 mm) and an Ar shielding gas. | |
Data prodotto definitivo in UGOV: | 26-giu-2013 | |
Appare nelle tipologie: | 4.01 Contributo in Atti di convegno |