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.
Dynamic analysis of metal transfer in GMAW: modeling and experiments / M. Boselli; V. Colombo; E. Ghedini; P. Sanibondi. - ELETTRONICO. - -:-(2011), pp. 322.1-322.4. (Intervento presentato al convegno International Symposium on Plasma Chemistry-ISPC 20 http://www.ispc-conference.org tenutosi a Philadelphia, USA nel 23-30 luglio 2011).
Dynamic analysis of metal transfer in GMAW: modeling and experiments
BOSELLI, MARCO;COLOMBO, VITTORIO;GHEDINI, EMANUELE;SANIBONDI, PAOLO
2011
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
