| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To manufacture a welded section steel which has T-shaped joint parts, has no recesses at welded parts, and has a high jointing strength in a simple method when manufacturing it through a laser welding method. <P>SOLUTION: A laser beam 4 is irradiated to the joining parts 3 of the ends of web materials while pushing the ends of the web materials 2 against flange materials 1 when manufacturing the welded section steel by forming the T-shaped joint parts by vertically pushing the ends of web materials 2 against the flange materials 1 both of which comprise a steel sheet through a laser welding. Preferably the laser beam 4 is irradiated with a tilt angleαof≤30°to the flange material 1. This welding method is applied to the manufacture of the welded section steel using, as the flange material and web material, a plated steel sheet to which Zn-based plating, preferably alloy plating containing Zn and Al, or more preferably alloy plating containing Zn, Al, and Mg is applied. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
