LASER WELDING DEVICE AND LASER WELDING METHOD

摘要

Provided is a laser welding device for welding by means of a laser beam in a low vacuum atmosphere, wherein said device suppresses porosity, ensures adequate weld penetration depth and prevents metal vapor from adhering to a laser beam-transmitting window (15). The laser welding device is provided with a shielding gas cylinder (40) that is disposed along the laser beam axis at a prescribed interval from the welding site, and has the transmitting window (15) installed on the top, while the bottom opens to an atmosphere controlled region. The device is further provided with a shielding gas supply means for introducing shielding gas to the interior of the shielding gas cylinder (40) from the transmitting window (15) side of the shielding gas cylinder. Also provided is a laser welding method that employs the aforementioned laser welding device.