Kabushiki Kaisha Toshiba

Yuuichi Motora

Satoshi Okada

Masahiro Takeuchi

Masataka Tamura

Seiichiro Kimura

Hidenori Takahashi

Masaki Yoda

Hiroyuki Miyasaka

Hiromi Kato

Wataru Kono

Masakazu Abura

Yoshio Hamamoto

Taiji Kobayashi

A heating laser beam is emitted to a cracked portion to remove moisture from the cracked portion, and subsequently, a welding laser beam is emitted to the cracked portion to heat and melt the cracked portion. The heating laser beam and the welding laser beam are emitted to an entire surface of the cylindrical body inside the reactor such as a stub tube penetrating through and fixed to a reactor bottom portion and a crack of the welded portion between the cylindrical body and the reactor bottom portion to thereby prevent a new crack from occurring and reactor water from leaking.

Reactor bottom repairing method

An underwater laser processing apparatus includes an optical unit and a nozzle. The optical unit irradiates a condensed laser beam generated by a YAG laser source to a certain point on a underwater workpiece. The nozzle has a gas exit for supplying a gas to the certain point. In the nozzle, an area surrounding the gas exit extends to the surface of the workpiece. This area keeps the supplied gas between the nozzle and the workpiece to improve the underwater laser process.

Underwater laser processing apparatus and underwater laser processing method

An underwater laser processing apparatus includes an optical unit and a nozzle. The optical unit irradiates a condensed laser beam generated by a YAG laser oscillator to a certain point on a underwater workpiece. The nozzle has a gas exit for supplying a gas to the certain point. In the nozzle, an area surrounding the gas exit extends to the surface of the workpiece. This area keeps the supplied gas between the nozzle and the workpiece to improve the underwater laser process.

Growing community of inventors

Tokyo, Japan

Yuuichi Motora