Stainless steel laser cutting method and laser cutting apparatus

摘要

In this method for laser cutting a stainless steel sheet using a fibre laser or a direct diode laser, when a mixed gas of nitrogen gas and air is used as an assist gas, the oxygen concentration in the assist gas is adjusted to 0.06-0.5%. The oxygen concentration in the assist gas is more preferably adjusted to 0.1-0.3%. As a result of adjusting the oxygen concentration in the assist gas as described above, dross-free laser cutting can be achieved.