LASER WELDING APPARATUS AND METHOD FOR ADJUSTING LASER BEAM OF THE LASER WELDING APPARATUS

摘要

The present invention relates to a laser welding apparatus and method for easily adjusting a laser focusing position according to a distance from a laser irradiating device to a laser irradiating point on a work piece (117), or a welding point. A post-collimation laser diameter is measured when the laser emitting end has an optimal laser diameter on the work piece (117) with respect to the distance from the laser processing head to the work piece. Corresponding data is stored with the above distance and the post-collimation laser diameter corresponding to each other. During welding, a diameter of the laser beam (15) passing through a collimate lens (16) is measured by a laser diameter measuring device (18). The post-collimation laser diameter is adjusted to be an optimal value according to the corresponding data.