Device and method for manufacturing welded shaped steel

Abstract

A welded shaped steel manufacturing device includes: a plate conveying device configured to convey a web member and two flange members in a conveyance direction; and a laser welding device configured to laser-weld butt portions of ends of the web member butting against the two flange members for weld-bonding, wherein the plate conveying device includes a web member holding device having surface side rollers arranged at intervals in the conveyance direction in a position not to block laser irradiation from the laser welding device toward welding points, and wherein the web member is held with the surface side rollers over a predetermined range in the conveyance direction, and wherein side ends of the surface side rollers facing the two flange members are positioned along boundaries of areas having spatters dispersed from the welding points in a degree exceeding a predetermined value.

What is claimed is: 
     
         1 . A welded shaped steel manufacturing method comprising the steps of:
 laser-welding, by a laser welding device, butt portions of ends of a web member butting against two flange members, respectively, for weld-bonding on a conveyance path,   while conveying, by a plate conveying device, the web member along with the two flange members on the conveyance path, in a state where the web member and the two flange members are arranged parallel to each other to have the web member interposed therebetween in such a manner that the web member butts perpendicularly against each of the two flange members,   thereby manufacturing a welded shaped steel,   said weld-bonding being accompanied with   holding the web member, over a predetermined range in a conveyance direction encompassing at least conveyance-direction positions of welding points therewithin, with a plurality of first surface side rollers, of a web member holding device, arranged at intervals in a conveyance direction, such that the plurality of first surface side rollers are allowed to roll on one surface of the web member, in a position not to block laser irradiation toward the welding points, and with a plurality of second surface side rollers, of the web member holding device, arranged at intervals in a conveyance direction, such that the plurality of second surface side rollers are allowed to roll on the other surface of the web member, in a position not to block laser irradiation toward the welding points,   wherein side ends of the plurality of first surface side rollers and side ends of the plurality of second surface side rollers facing the two flange members, respectively, are positioned along boundaries of a pair of areas each having spatters dispersed from the welding points in a degree exceeding a predetermined value.   
     
     
         2 . A welded shaped steel manufacturing method comprising the steps of:
 laser-welding, by a laser welding device, butt portions of ends of a web member butting against two flange members, respectively, for weld-bonding on a conveyance path,   while conveying, by a plate conveying device, the web member along with the two flange members on the conveyance path, in a state where the web member and the two flange members are arranged parallel to each other to have the web member interposed therebetween in such a manner that the web member butts perpendicularly against each of the two flange members,   thereby manufacturing a welded shaped steel,   said weld-bonding being accompanied with   holding the web member, over a predetermined range in a conveyance direction encompassing at least conveyance-direction positions of welding points therewithin, with a plurality of first surface side rollers, of a web member holding device, arranged at intervals in a conveyance direction, such that the plurality of first surface side rollers are allowed to roll on one surface of the web member, in a position not to block laser irradiation toward the welding points, and with a plurality of second surface side rollers, of the web member holding device, arranged at intervals in a conveyance direction, such that the plurality of second surface side rollers are allowed to roll on the other surface of the web member, in a position not to block laser irradiation toward the welding points,   wherein side ends of the plurality of first surface side rollers and side ends of the plurality of second surface side rollers facing the two flange members, respectively, are positioned along boundaries of a pair of areas each being subjected to heat influence from the welding points in a degree exceeding a predetermined value.