부산대학교 도서관

The power- and current-density distributions in a welding arc can significantly affect heat and fluid flow in the weld pool during arc welding, which in turn affects important weld characteristics, such as weld penetration, segregation, gas porosity and solidification structure. In order to provide quantitative information for studying heat and fluid flow in the weld pool, an experimental study was carried out to measure the power- and current-density distributions in gas tungsten arcs using a split-anode technique. The method for determining the power- and current-density distributions from the experimental data generated by the split-anode technique is rather critical. A new, improved, method developed in the present study, as well as four other previous methods, were employed to determine the power- and current-density distributions from the experimental data. The validity of the approximation of the Gaussian distribution was examined, and the effects of the arc length, arc current and electrode diameter were observed.