A221 矩形レーザとホットワイヤによる高効率補修技術の開発(OS2 保全・設備診断技術(4))

抄録

An additional maintenance program is need based on results of re-evaluation for the executed maintenances. Especially, repairing of wider or more complicated shaped area may be repairing targets. Underwater laser welding has been developing as a repairing technique for nuclear power plants. In past study, a new repairing technique combined direct diode laser (DDL), which has rectangular energy distribution, with hot wire feed device were proposed to improve efficiency of welding. This new repairing technique indicated twice efficiency of welding compared to the conventional underwater laser welding. In this study, "Fiber transmission" and "Converting rectangular energy distribution from Gaussian energy distribution by diffractive optical element (DOE)" were considered. As the results of welding tests, DDL configuration indicated the same capability of welding as DOE configuration.