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

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 l...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	Mahara, Yoichi, Kurosawa, Koichi, Uchiyama, Keigo, Ohmori, Shinya, Morinaka, Ren, Nitta, Kazuhiro
Format:	Patent
Sprache:	eng
Schlagworte:	CLADDING OR PLATING BY SOLDERING OR WELDING COMBINED OPERATIONS CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR NUCLEAR ENGINEERING NUCLEAR PHYSICS NUCLEAR REACTORS OTHER WORKING OF METAL PERFORMING OPERATIONS PHYSICS SOLDERING OR UNSOLDERING TRANSPORTING UNIVERSAL MACHINE TOOLS WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	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.