Koji Okimura
Mitsubishi Heavy Industries
23 Papers
192 Citations
Koji Okimura is an academic researcher from Mitsubishi Heavy Industries. The author has contributed to research in topics: Nozzle & Welding. The author has an hindex of 6, co-authored 23 publications. Previous affiliations of Koji Okimura include Tohoku Electric Power.
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Papers
Patent
Laser beam machining head
Nagura Yasumi,Michisuke Nayama,Takashi Ishide,Yoshio Takasago-shi Hashimoto,Yukio Michishita,Koji Okimura,Tadashi Nagashima,Masao Watanabe,Takashi Akaba,Katsusuke Shimizu +9 more
- 27 Oct 1999
TL;DR: A laser beam machining head includes a dividing optical system for dividing laser light into two separate laser beams, and providing spacing therebetween; a condensing optical systems for condensing the separate laser beam into condensed laser light, and projecting it onto a cutting site of an object to be cut as discussed by the authors.
101
Patent
Laser beam machine with plural beams
Yoshio Hashimoto,Takashi Ishide,Nagura Yasumi,Nayama Risuke,Koji Okimura,保身 名倉,理介 名山,義男 橋本,浩司 沖村,孝 石出 +9 more
- 26 Jan 1999
TL;DR: In this paper, a variable focus lens is used to make a part of a laser beam a focus position different from other parts along an optical axis so that the variable lens is adjustable to put in and out to the optical axis in the inside of an optical system.
31
10-kW-class YAG laser application for heavy components
Takashi Ishide,Syuhou Tsubota,Michisuke Nayama,Yoshiaki Shimokusu,Tadashi Nagashima,Koji Okimura +5 more
TL;DR: In this paper, the authors have put the YAG laser of the kW class to practical use for repair welding of nuclear power plant steam generator heat exchanger tubes, all-position welding of pipings, etc.
29
Reliability of Water Jet Peening as Residual Stress Improvement Method for Alloy 600 PWSCC Mitigation
Koji Okimura,Takao Konno,Marekazu Narita,Takahiro Ohta,Masahiko Toyoda +4 more
- 01 Jan 2008
TL;DR: In this article, a water jet peening (WJP) was applied to Reactor Vessel (RV) outlet/inlet nozzle safe-end joints (Alloy600 weld metal), RV Bottom Mounted Instrument (BMI) inner surface and J-weld.
16
Patent
Nozzle mounting structure
Nobuyuki Hori,Ryuichi Narita,Moritatsu Nishimura,Harutaka Suzuki,Koji Okimura +4 more
- 18 Jan 2011
TL;DR: In this paper, the authors provided a nozzle mounting structure for mounting a nozzle (20) penetrating through a reactor vessel (10) having a hemispherical concave inner surface, which included a removed concave portion (17) in which a base material (12) on an inner surface side of the reactor vessel was removed in a symmetrical shape around a normal line (N) on the hemispheric concave internal surface of the vessel.
10