Apparatus and method for electrical roller seam welding using a wire electrode

摘要

In a welding apparatus for the longitudinal seam welding of can bodies (31′) by way of electrode rollers (8, 17), three drive stages (4, 10, 20), by means of which the wire electrode (25) is driven in addition to the drive by the electrode rollers (8, 17), are provided in the wire course. Preferably, elastic stretching is brought about in this case by the three drive stages (4, 10, 20).

主权项

1. Welding device (35) for electric seam welding, with a first electrode roller (8) and a second electrode roller (17), wherein the welding path of the device for the objects to be welded lies between the electrode rollers and wherein a common wire electrode (25) runs on the electrode rollers, which adopts a predefined wire path in the device, wherein the second electrode roller (17) is driven by an own drive (32) for rotating with the adjustable nominal welding speed, characterized in that three drive stages (4, 10, 20) are provided for the wire electrode in addition to the drive of the wire electrode by the driven electrode roller, in such a way that the first drive stage (4) acts upon the wire electrode in the path of the wire before the first electrode roller (8), that the second drive stage (10) acts upon the wire electrode in the path of the wire between the first electrode roller (8) and the second electrode roller (17) and that the third drive stage acts upon the wire electrode in the path of the wire after the second electrode roller (17), in that at least two of the drive stages (4, 10, 20) have a common drive motor (33) for the drive of the wire electrode, in that the drive stages (4, 10, 20) have each at least a drive roller for the drive of the wire electrode, around which the wire electrode is partly or entirely wound, and in that the drive rollers of the drive stages have different diameters, wherein the drive roller of the first drive stage (4) has a smaller diameter than the drive roller of the second drive stage (10) and the drive roller of the third drive stage (20) has a larger diameter than the drive roller of the second drive stage (10).