Seam welding system, seam welding method, and method for producing a to-be-welded object

Abstract

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

Description

technical field [0001] The disclosed embodiments relate to a seam welding system, a seam welding method, and a production method of a welded object. Background technique [0002] Conventionally, there is known a seam welding system (for example, refer to Patent Document 1) in which an object to be welded is held by a robot, and seam welding is performed while sending such an object to be welded between a pair of roller electrodes. [0003] Such a seam welding system includes: the aforementioned pair of disc-shaped electrodes; and motors respectively provided on the disc electrodes to rotate the respective disc electrodes. [0004] In addition, in the seam welding system, a robot sends the object to be welded between the pair of roller electrodes, and at the same time, the roller electrodes are rotated by a motor while being pinched and pressurized by the respective peripheral portions of the roller electrodes. Seam welding is performed on the object to be welded by using a ...

AI Technical Summary

Problems solved by technology

Therefore, it is not possible to perform high-quality seam welding on the welded object sufficiently

[0009] In addition, since the trajectory is unstable as described above, it is necessary to repeat a large number of tests to teach the robot, which is troublesome.

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