Device and method for manufacturing welded shaped steel

A welded shaped steel manufacturing device comprising:

• a plate conveying device configured to convey a web member having two opposite surfaces and two flange members 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;
• and
• a laser welding device configured to laser-weld butt portions of ends of the web member butting against the two flange members, respectively, for weld-bonding on a conveyance path on which the web member along with the two flange members are conveyed by the plate conveying device, wherein
• heat influence is exerted on, within a pair of specified areas around welding points, as a result of laser-welding in a degree exceeding a predetermined value,
• said plate conveying device comprising
• a web member holding device including
• a plurality of first surface side rollers arranged on a one surface of the two opposite surfaces of the web member at intervals in a conveyance direction, such that the plurality of first surface side rollers are allowed to roll on the one surface of the web member, in a position not to block laser irradiation toward the welding points, and
• a plurality of second surface side rollers arranged on an other surface of the two opposite surfaces of the web member 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,
• thereby holding the web member with the plurality of first surface side rollers and the plurality of second surface side rollers over a predetermined range in a conveyance direction encompassing at least conveyance-direction positions of the welding points therewithin,
• 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 the pair of specified areas such that
• the side ends of the plurality of first and second surface side rollers facing the two flange members are adjustably positioned closer to a centerline of the web member in a width direction when conveyance-direction positions of the surface side rollers are inside the pair of specified areas
• in comparison with
• the side ends of the plurality of first and second surface side rollers facing the two flange members being proximate to butt portions of the web member in the width direction butting against the two flange members when conveyance-direction positions of the surface side rollers are outside the pair of specified areas.

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, wherein
• spatters are dispersed, within a pair of specified areas around welding points, as a result of laser-welding in a degree exceeding a predetermined value,
• 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 the welding points therewithin, with a plurality of first surface side rollers, of a web member holding device, arranged on a one surface of two opposite surfaces of the web member at intervals in a conveyance direction, such that the plurality of first surface side rollers are allowed to roll on the 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 on an other surface of the two opposite surface of the web member 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 the pair of specified areas such that
• the side ends of the plurality of first and second surface side rollers facing the two flange members are adjustably positioned closer to a centerline of the web member in a width direction when conveyance-direction positions of the surface side rollers are inside the pair of specified areas
• in comparison with
• the side ends of the plurality of first and second surface side rollers facing the two flange members being proximate to butt portions of the web member in the width direction butting against the two flange members when conveyance-direction positions of the surface side rollers are outside the pair of specified areas.

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, wherein
• heat influence is exerted on, within a pair of specified areas around welding points, as a result of laser-welding in a degree exceeding a predetermined value,
• 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 the welding points therewithin, with a plurality of first surface side rollers, of a web member holding device, arranged on a one surface of two opposite surfaces of the web member at intervals in a conveyance direction, such that the plurality of first surface side rollers are allowed to roll on the 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 on an other surface of the two opposite surfaces of the web member 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 adjustably positioned along boundaries of the pair of specified areas such that
• the side ends of the plurality of first and second surface side rollers facing the two flange members are positioned closer to a centerline of the web member in a width direction when conveyance-direction positions of the surface side rollers are inside the pair of specified areas
• in comparison with
• the side ends of the plurality of first and second surface side rollers facing the two flange members being proximate to butt portions of the web member in the width direction butting against the two flange members when conveyance-direction positions of the surface side rollers are outside the pair of specified areas.