Numerical Simulation of Pulsed Arc Welding by Melting Electrode

Abstract

In this paper the processes of melting and transfer of an electrode metal to the molten pool, hydrodynamics of molten pool in controlled pulsed arc welding in carbon dioxide have been investigated. The process of pulsed arc welding with systematic short-circuits of the arc gap is realized by adaptive algorithms of pulsed control over main energetic parameters of welding - arc current and voltage, arc heated efficiency, peak short-circuiting current, which provide the dosage of energy for melting and transfer of every drop of an electrode metal, the control over fluidity of the weld pool. Physical and mathematical models describing such processes in CO2, original software have been developed. The results of physical simulation and mathematical modelling permit to determine the influence of energetic parameters of the process on the condition of the “power source – electrode – arc – molten pool” electrodynamic system at each moment of time.