| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a method for a laser beam welding in which the length of a flange part is made short. SOLUTION: The flange part 4 of a fixing part 2 is laminated with a base member 1 and the flange part 4 is welded to the base member 1. The welding is a remote laser beam welding in which a laser beam 8 which has a long focal distance is reflected on a mirror 10 and guided along a welding trajectory. The welding is performed by irradiating the flange part 4 with the laser beam 8 along the welding trajectory which forms a loop extending from the beginning point to the ending point of welding, however, in which the welding trajectory and the beginning and ending points of welding do not overlap. The loop trajectory of welding is substantially a C-shaped welding trajectory. Further, the base member 1 is a pipe, the flange part 4 is formed in a circular-arcuate shape according to the outer peripheral shape of the pipe and the base member 1 and the fixing part 2 are used as a reinforcement for an instrument panel of a motor vehicle.</p> |
