| 摘要 |
A seam welding system (1) includes a pair of roller electrodes (26, 27). The pair of roller electrodes (26, 27) hold a to-be-welded object (W) between circumferential surfaces of the roller electrodes (26, 27), rotate while holding the to-be-welded object (W) between the circumferential surfaces, and perform seam welding on the to-be-welded object (W) when a current flows between the roller electrodes (26, 27) while rotating and holding the to-be-welded object (W) between the circumferential surfaces. the roller electrodes (26, 27) are mounted to an electrode movement mechanism (13). The electrode movement mechanism (13) moves the roller electrodes (26, 27) along a welding line of the to-be-welded object (W). Drive sources (M1-M8) respectively rotate the roller electrodes (26, 27) and a joint of the electrode movement mechanism (13). A controller (31) controls an amount by which the roller electrodes (26, 27) rotate based on a torque change in the drive sources (M1-M8) so as to keep torques respectively acting on the roller electrodes (26, 27) within a predetermined range. |
