Abstract
In present study, a method for measurement and visualization of temperature of plasma and concentration of metal vapor in arc welding with consumable electrode is conducted. Monochromatic images by three high-speed video cameras are utilized in order to clarify behavior of plasma states. The plasmas photographed by the high-speed video cameras during arc welding.Consequently, visualizations of plasma temperature and iron vapor concentration succeed during welding. The dual structure consisting of a low temperature region by metal vapor plasma near the arc axis and a high temperature region by shielding gas plasma at surrounding of the arc exists because of metal vapor which is vaporized at the tip surface of a consumable electrode and is transported by the plasma jet from the consumable electrode to the weld pool.
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