[I56-62] デブリ取出し技術及びシステム開発

[I57] Study on removal technologies for Fukushima's fuel debris using laser light

(7) Evaluation of transient temperature characteristics of molten metal during laser cutting process

^〇Long Nguyen Phi¹, Toshihiko Takebe¹, Toshihide Hanari¹, Tomonori Yamada¹, Toshiharu Muramatsu¹ (1.Japan Atomic Energy Agency)

Keywords:Fiber laser cutting, Thick section steel, Molten metal temperature, Thermography

Laser cutting of thick-section stainless steel using assist gas is one of the major applications of high power lasers in the decommissioning of nuclear power plants.  It is required that a control system could perform remote cutting using a fiber laser. The molten metal temperature is a key factor which directly affects the cutting quality. In this work, we have investigated the transient temperature characteristics of molten metal relating to the cutting performance. In addition, the relationship between temperature of top surface and inside material was determined by using thermography and embedded thermocouple.