Abstract
Electroslag welding is a high heat input, high deposition rate and highly efficient welding process that has been applied to large structures. However, the principle of electroslag welding makes direct observation of molten area difficult because the welding region is surrounded by base metal or water-cooled copper devices, and the phenomenon is not completely understood at present. Although the temperature of the molten area after current interruption has been measured, the temperature distribution during welding has not been measured. In this study, in order to better understand the phenomenon of ESW by clarifying the temperature distribution of the molten area during welding, the molten area was directly observed and the temperature distribution was measured by two-color pyrometry. As a result, it has been revealed that the maximum temperature is about 2200 K in the vicinity of the wire tip. The high-temperature and low-temperature areas measured in this study roughly represent at the molten slag and molten metal areas, respectively.
