Dimensionless representation of the column characteristics and weld pool interactions for a DC argon arc

摘要

The column characteristics and weld pool interactions for a DC argon arc in a GTAW configuration are represented by dimensionless correlations. Arc was described by a numerical model, considering currents between 200-300 A and arc lengths between 5-10mm. The arc, defined as the loci of the 10,000K isotherm, was found to display a parabolic shape; whose parameters are independent of current and arc length. Arc column temperature, velocity, and magnetic field are scaled with the width of the arc and a maximum that can also be predicted with a dimensionless approach. Arc-melt interactions include arc pressure, heat and current fluxes, and shear stress are also captured in dimensionless form. Scaling results compare well to numerical and experimental results reported.