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1. (WO2015125522) LASER WELDING HEAD, LASER WELDING DEVICE, AND GAS NOZZLE FOR LASER WELDING HEAD

Pub. No.:    WO/2015/125522    International Application No.:    PCT/JP2015/050952
Publication Date: Fri Aug 28 01:59:59 CEST 2015 International Filing Date: Fri Jan 16 00:59:59 CET 2015
IPC: B23K 26/21
B23K 26/064
B23K 26/142
Applicants: AMADA HOLDINGS CO.,LTD.
株式会社アマダホールディングス
Inventors: TAKATSU, Masato
高津 正人
Title: LASER WELDING HEAD, LASER WELDING DEVICE, AND GAS NOZZLE FOR LASER WELDING HEAD
Abstract:
A laser welding head equipped with: a hollow head main body on the tip end of which an emission aperture that emits laser light is formed, and which is optically connected to a laser oscillator; a protective glass which covers the emission aperture and is provided on the head main body in a detachable manner; and an annular gas nozzle provided closer to the workpiece than the protective glass. A gas passage capable of being connected to a gas supply source is formed in the interior of the gas nozzle. A first nozzle, which emits gas toward the light axis of the laser light on the irradiation-direction side of the laser light, and second nozzles, which emit gas along the irradiation direction of the laser light, are formed on the gas nozzle. The first nozzle is formed so as to communicate with the gas passage and to surround the light axis of the laser light. The second nozzles are formed so as to communicate with the gas passage and to surround the first nozzle, at a position on the outside of the first nozzle in the radial direction. By means of this laser welding head it is possible to prevent fumes from interfering with the laser light and to reduce the adhesion of sputter on the protective glass.