| 摘要 |
<P>PROBLEM TO BE SOLVED: To attain the derating of shape straightening and the quality improvement of a section steel by preventing the vertically asymmetrical deformation of the angle of a flange material, when manufacturing a welded H-section steel by irradiating T joint portions of two places with laser lights simultaneously from only one surface side of a web material assembled into an H shape. <P>SOLUTION: Laser welding is performed in the state that the flange material before welding is held so that the angle placed between itself and the web material may become small in a laser light irradiating side, and the angle placed between itself and the web material may become large in an opposite side to the laser irradiating side. As the flange material, a plate material folded to the opposite side to the web material with the contact portion to the web material being as a border is preferably used. <P>COPYRIGHT: (C)2012,JPO&INPIT |
