Patent ID: 11964339
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Machine tools (Mechanical engineering)
Classification: CPC B  G | IPC B  G

Claim 0:
1. A laser welding device for welding a weld part with a laser light, the laser welding device comprising:
an irradiator configured to overlap the laser light and a measurement light coaxially with each other and apply the laser light and the measurement light to the weld part, a wavelength of the measurement light being different from a wavelength of the laser light;
a measuring instrument configured to repeatedly measure a weld penetration depth of the weld part based on the measurement light that is emitted from the irradiator and reflected on the weld part so as to generate a plurality of measured values;
a determiner configured to determine the weld penetration depth of the weld part based on: (i) one or more of the plurality of measured values; or (ii) an average value of the one or more of the plurality of measured values, the one or more of the plurality of measured values being included within a predetermined range with reference to a greatest side measured value of the plurality of measured values; and
an irradiation position changer configured to change: (i) an irradiation position of the measurement light such that the irradiation position of the measurement light moves on a predetermined welding path; and (ii) an opticla axis position as the irradiation position of the measurement light such that the optical axis position moves within a region of the weld part having a radius of rotation that is smaller than half of a spot diameter of the laser light,
wherein the measuring instrument is configured to generate the plurality of measured values while the measurement light is being moved.