| 摘要 |
PURPOSE:To obtain adaptability for an object to be processed by bending one of the laser beam systems halved by a partial reflection mirror with a total reflection mirror and providing a lens for a normal working laser beam and an auxiliary working laser beam. CONSTITUTION:The laser beam from a laser beam oscillator 1 is halved by a partial reflection mirror Ms into a 1st laser beam system abundant in beam energy and a 2nd laser beam system poor in it, either is bent by a total reflection mirror Mm, a lens is provided at least in one system, the 1st beam system is used for a normal working and the 2nd beam system is for the auxiliary working. In this way, the laser beam energy corresponding to the object to be processed can be used. When this is applied to welding a surface treated steel sheet having a rust preventive film, it is used effectively to prevent welding defects from generation. |
