Laser Welding Apparatus, Preventive Maintenance Method for Reactor Internal of Nuclear Power Plant, and Laser Cutting Apparatus

摘要

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.

主权项

1. A laser welding apparatus comprising:
a welding head including a head body, and a collimate lens opposite to an end face of an optical fiber connected to the head body and installed in the head body; and a welding head scanning apparatus of scanning the welding head, wherein a laser path of introducing a laser emitted from the optical fiber and passing through the collimate lens is formed in the head body; wherein the welding head includes only the collimate lens as a lens; and wherein a laser outlet of the laser path is formed in an end portion of the head body.