Other

Hitachi-ge Nuclear Energy, Ltd.

Kazuhiro Nitta

Ren Morinaka

Koichi Kurosawa

Kouichi Kurosawa

Katsuhiko Hirano

Toshiharu Nagashima

Shinya Ohmori

Keigo Uchiyama

Yoshitoshi Suzuki

Shinji Go

Youichi Mahara

Yoichi Mahara

The laser welding apparatus includes a welding head and a welding head scanning apparatus. A collimate lens installed on a head body of the welding head is arranged opposite to an end face of optical fibers. The welding head includes only the collimate lens as a lens and the length is shortened. A laser generated by a laser oscillator is introduced into the optical fiber, enters the collimate lens, and then is converted to a parallel beam by the collimate lens. The laser of a parallel beam is irradiated on a surface a welding portion of the welding object through a laser path and the surface of the welding portion is melted. Metallic powder is jetted from powder feed paths formed in a head body to the melted portion and build-up welding is performed on the surface of the welding portion.

Laser welding apparatus, preventive maintenance method for reactor internal of nuclear power plant, and laser cutting apparatus

An opening portion is produced by cutting a recirculating piping connected to a recirculating nozzle of a reactor pressure vessel A repairing device is brought into an annulus of the reactor pressure vessel from the opening thereby repairing the annulus

Device and method for repairing inside of reactor pressure vessel

Growing community of inventors

Kure, Japan

Kazuhiro Nitta