LASER BEAM WELDING MACHINE AND LASER BEAM WELDING METHOD

摘要

PROBLEM TO BE SOLVED: To improve an external appearance by extremely reducing a recessed groove width formed to a welding joining part between an upper end flanges of a body side and a vehicle direction end part of a roof panel. SOLUTION: A guide roller 17 is pressed at an aligned state to an upper end corner part 5a by a first pressing cylinder 53, at the same time, a pair of pressing rollers 19 are pressed to a roof panel 1 by a second pressing cylinder 57. At this state, the guide roller 17 and the pressing roller 19 are integrally rotary-moved, at the same time, from a laser beam machining head 15 mounted to a lower bracket 41 supporting the guide roller 17, a laser beam 13 is irradiated toward an overlapped part 9 in the groove 11 at the moving side rear side of the guide roller 17.