| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a laser beam welding method which easily controls the size of a clearance to be set up between base materials. <P>SOLUTION: In the invented laser beam welding method, an embossed portion 6 is preformed in a bracket 2 to be welded to a member 1. The embossed portion 6 is convexed toward the member 1, is shaped like a shallow saucer and has a spherical surface. The member 1 and the bracket 2 are welded on the inclined plane of the embossed portion 6 as a weld zone with a weld bead 4 which is concentric with the embossed portion 6 and has a nearly looped C shape. The clearance 7 is set up between the embossed portion 6 and the member 1. The clearance 7 gradually increases in size as the distance from the center of the embossed portion 6 increases. A ring-shaped proper welding region M in set up such that it is concentric with the weld bead 4 and is defined by the lower limit value G1 and upper limit value G10 of the clearance 7 required for attaining satisfactory welding quality. Welding is performed by irradiating a laser beam 5 to the proper welding region M. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
