Laser cutting method for plated steel sheet, laser processing head and laser processing apparatus

Laser cutting of a plated steel sheet according to the present invention comprises: irradiating the plated steel sheet covered with a plating metal with a laser beam with a wavelength in a 1 [mu]m band to cut the plated steel sheet; and coating the cut surface with the plating metal by blowing an assist gas on the cut surface of the plated steel sheet formed in the cutting process and by causing the plating metal melted by the irradiation with the laser beam to flow to the cut surface. 镀敷钢板的激光切断加工通过如下工序来进行，即：将波长为1μm波段的激光向被镀敷金属覆盖的所述镀敷钢板照射来切断所述镀敷钢板；向在所述切断的工序中形成的所述镀敷钢板的切断面喷出辅助气体，使通过所述激光的照射而熔融的所述镀敷金属向所述切断面流动而通过所述镀敷金属覆盖所述切断面。