| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an aluminum joined body, capable of welding an aluminum material containing Mg at high productivity and making a welded portion excellent in welding quality. <P>SOLUTION: A pair of materials to be welded made of an aluminum material are disposed so as to abut to each other, and the abutting portion is irradiated with a laser beam having two or three focal points on a single optical axis. A first focal point position of a first laser beam is set to be a position within 0.2 mm in an optical axis direction from a datum plane which is the surface of the materials to be welded, a second focal point position of a second laser beam is set to be a position of 0.2-0.9 mm toward the inside of the materials to be welded in the optical axis direction from the datum plane, and a third focal point position of a third laser beam is set to be a position of 0.2-0.5 mm toward the upper part of the materials to be welded in the optical axis direction from the datum plane. <P>COPYRIGHT: (C)2012,JPO&INPIT |
