Laser Processing Device And Laser Processing Method

Abstract: This laser processing device comprises: a laser light source unit for irradiating the surface of a steel sheet being transported in a prescribed direction with laser light; an air nozzle for discharging first air toward the site being irradiated with the laser light at a flow rate of 140 m/sec or less; and a first dust collection part having a first opening section in which a central axis passing through the center of an opening shape is disposed substantially parallel to a nozzle main axis direction of the air nozzle and which is formed at a position facing the surface of the steel sheet, and a first dust collection duct linked to the first opening section, the first dust collection part drawing laser spatter generated from the site being irradiated with the laser light via the first opening and collecting the drawn-in laser spatter using the first dust collection duct in a state in which the average drawing flow rate, which is a value obtained by dividing the drawing flow rate of the first dust collection duct by the cross-sectional area of the first dust collection duct, is 15-50 m/sec inclusive.

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