| 摘要 |
PROBLEM TO BE SOLVED: To efficiently and exactly uniformize the processing result and processing quality of laser processing in which a workpiece is irradiated with a laser beam over a fixed period.SOLUTION: Through laser seam welding time, the peak power of a pulse laser beam FBis retained to a fixed value Ps, and the duty Dof the pulse laser beam FBi is changeably controlled in such a manner that laser power density per unit area is made fixed on a welding line. Thus, in the first stage sections (tto t), with the peak power of the pulse laser beam FBkept at Ps (reference value), the duty Di (pulse width T) increases per cycle, and the laser power (laser energy per unit time) linearly increases. |
