| abstract |
PROBLEM TO BE SOLVED: To provide a resin welding method capable of reliably preventing the occurrence of damage due to excessive heat input in a welding scheduled region. A laser beam L in which a part of a ring-shaped planned welding region R having a center line CL is an irradiation region while rotating the welding planned region R relatively a plurality of times around the center line CL, The laser beam L is irradiated to the welding planned region R. As a result, the laser beam L is intermittently applied to a part of the planned welding region R, so that the decomposition temperature of the resin member may be exceeded by a single irradiation of the laser beam to a part of the planned welding region R. A rapid temperature rise can be prevented. Moreover, since the cross-sectional shape of the laser beam L perpendicular to the optical axis OA is an annular shape in the planned welding region R, the irradiation of the laser beam L in the laser beam incident side end R1 of the planned welding region R and in the vicinity thereof. It is possible to prevent damage caused by excessive heat input at the center of the region. [Selection] Figure 4 |