| 摘要 |
PURPOSE:To improve the welding strength of the position to be welded by irradiating the part having direction of larger distance mutually separated as directing toward the inner part of overlapped welding part to form plural melting parts mutually overlapping the laser beam. CONSTITUTION:The laser beam Y intermittently irradiates at four times from a laser beam generator and also, while synchronizing with this irradiation, movement for turning a movable mirror 15 at each 90 deg. angle is executed with a motor 20. The laser beam Y is divided into the laser beams Y1, Y2, Y3 and Y4 mutually separating beam axes (y) and these beams irradiate to condensed lens 11 in order. At the position to be welded in the overlapping part 10, four beam spots, in which the distance between the centers in the adjacent two spots is made to the prescribed value, are formed in order and the welded part having larger distance mutually separated as directing toward the inner part of the welded part is formed. By this method, as plural melted part obtaining the comparatively high welding strength is formed, the welded strength of the welded position can effectively be improved. |
