Stability of short-circuiting transfer process based on GMAW dynamic model

The dynamic process of short-circuiting transfer was simulated by the established model. The short-circuiting transfer frequency, the equivalent radius of contact droplet and residual droplet, the velocity and displacement of droplet and the change of liquid bridge shape were predicted. The relationship between the metal transfer parameters and its process stability was analyzed, and the optimal arc is successfully predicted, which provides the basis for the parameter optimization of the welding process. The results show that the welding parameters that corresponds to the highest transfer frequency are not the optimal parameters. Further, the equivalent radius of residual droplet is minimum, and the variation of droplet oscillation velocity and displacement is slight under the condition of optimal welding parameter. Meanwhile, the smaller the equivalent radius of contact droplet and the principal radius of liquid bridge, the better the stability of short-circuiting transfer process.