LASER WELDING DEVICE

摘要

PURPOSE:To provide a titled device which prevents staining of protective glass and improves quality and productivity by the constitution in which a laser beam is transmitted through the through-hole of a working nozzle fitted to the laser beam outlet side of the protective glass and a gas is blown off. CONSTITUTION:A working nozzle body 17 mounted with protective glass 22 for a working lens 21 which condenses a laser beam 20 oscillated from a laser oscillator for working is installed freely attachably and detachably by means of a set bolt 18 to a lens holder 19 on the body side of a laser working machine of a laser welding device. A gas 24 such as inert gas or air is admitted through a gas inflow port 23 into said body 17 and is ejected through a through-hole 25 for transmission of the laser beam 20 provided near the focus point for working to prevent the entry of the gas 26 generated during welding into the working nozzle, to prevent the contamination of the glass 22 and at the same time to decrease the spatter 29 scattering from the molten part 28 of materials 27 to be welded. Said gas depresses the part 28 and forms a smooth weld surface.