Three dimensional temperature measurement of the gas tungsten arc plasma

Abstract

Temperature measurement of the arc plasma is so important regarding the realization of the physical property that spectroscopic techniques have been used to measure the temperature distribution in free-burning arcs in argon gas. These methods, however, assume that the arc plasma is axially symmetry, so they can be applied to only the symmetrical arc plasma. In the point of production, since the arc welding is applied to various joint geometries and the welding torch moves along the welding line, most of actual arc plasma phenomena are not axially symmetric. Therefore it is required to develop a measurement method of the non-axial symmetrical arc plasma. This study proposes a three dimensional temperature measurement method with use of the image reconstruction. This method could obtain much the same temperature distribution as previously reported methods and be applied to the non-axial symmetrical arc plasma.