抄録
In the present research, a general-purpose method for measurement and visualization of temperature of plasma and concentration of metal vapor in gas shielded arc welding with consumable electrode is conducted. Monochromatic images by double high-speed video-cameras are utilized to obtain the dynamic temperature of plasma and the dynamic concentration of metal vapor in arcs. Whole arc plasma photographed by the high-speed video-cameras during arc welding is treated with plasma diagnostics.
Consequently, visualizations of plasma temperature and metal vapor concentration succeed during gas shielded arc welding with consumable electrode. Metal vapor which evaporate from the tip surface of a consumable electrode is transported by the plasma jet from the consumable electrode towards the weld pool. Therefore, temperature near the arc axis where concentration of metal vapor is high decreases. This means that the dual structure consisting of a low temperature zone by metal vapor plasma near the arc axis and a high temperature zone by shielding gas plasma at surrounding of the arc.
