Generalized representation of arc shape, arc column characteristics and arc-weld pool interactions for DC electric arcs burning in monoatomic gases

摘要

The shape of a DC electric arc in arc welding with monoatomic shielding gases (Ar, He and Ar/He blends) is generalized in dimensionless form with algebraic correlations. The novel expressions capture the main magnetohydrodynamic arc characteristics (temperature, velocity, magnetic field) and also yield the main arc-weld-pool interactions (heat flux, current density and pressure). The proposed correlations are validated against numerical results presented in this work and numerical and experimental results found in the literature. Simulated electric arcs conditions considered include arc currents and arc lengths in the range of 200-300 A and 5-10 mm respectively, burning in Ar and Ar-He mixtures and arc lengths ranging from 7-10 mm for He.