CPC B23K 26/032 (2013.01) [B23K 26/0643 (2013.01); B23K 26/0648 (2013.01); B23K 26/082 (2015.10); B23K 26/21 (2015.10); B23K 31/125 (2013.01); G01B 11/22 (2013.01)] | 3 Claims |
1. A laser welding method for welding a weld part with a laser light, the laser welding method comprising:
an irradiating step of overlapping the laser light and a measurement light having a different wavelength from a wavelength of the laser light coaxially with each other and applying the laser light and the measurement light to the weld part;
an irradiation position changing step of changing an irradiation position of the measurement light so as to move on a predetermined welding path, and changing an optical axis position being the irradiation position of the measurement light so as to move within a region of the weld part having a radius of rotation that is smaller than ½ of a spot diameter of the laser light;
a measuring step of repeatedly measuring a weld penetration depth of the weld part based on the measurement light that is reflected on the weld part while the measurement light is moving; and
a determining step of determining the weld penetration depth of the weld part using a plurality of measured values of the weld penetration depth, the plurality of measured values being measured in the measuring step within a fixed time period for each of a plurality of time intervals, each of the plurality of time intervals having the fixed time period.
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