Laser irradiation position measurement method and laser welding inspection method

Abstract

To provide a laser irradiation position measurement method for measuring the irradiation position of laser welding light on a member to be welded. [Solution] The laser irradiation position measurement method is a method for measuring the irradiation position of laser welding light on a welding target member including a first member and a second member extending in a direction intersecting the first member, comprising: step ST1, irradiating the target surface of the welding target member with laser welding light while wobbling, and acquiring time-series data of the melting depth at the irradiation point of the laser welding light; step ST2, performing frequency analysis on the time-series data acquired in step ST1 and acquiring spectral data; step ST3, acquiring the intensity value of at least one peak from the spectral data acquired in step ST2 as an input value; and step ST4, calculating the central irradiation position of the laser welding light based on the input value acquired in step ST3.

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