Internal welding of tubes and profiles

Abstract

The invention relates to a device (1) for internal welding of pipes and profiles, comprising a cantilever (2, 2a) which is fastened to a suspension (3) and which can be introduced into a pipe or profile to be welded and on which a welding head (4) is movably mounted, the cantilever (2, 2a) further comprising at least one laser (5) and at least one camera (6). In order to reduce the adverse effects of magnets and heat on the position of the welding head (4), it is proposed according to the invention that a laser (5) is mounted on the suspension (3) and a camera (6) is mounted on the end of the boom (3) or on the welding head (4) in order to observe the laser beam (5a). A correction signal is calculated from a change in the position of the laser beam (5a) observed by means of the camera (6) and is continuously conducted to a control unit in order to guide the welding head (4) by means of the displacement means (8, 9).

Description

technical field [0001] The invention relates to a device and a method for the internal welding of pipes and profiles, the device comprising a cantilever on which the cantilever is fixed, the cantilever can be introduced into the pipe or profile to be welded and the welding head is movably mounted on on the cantilever, wherein the cantilever also includes a laser and a camera. Background technique [0002] During internal welding, the welding head is usually placed on the end of a long cantilever which is driven into the pipe or profile. The media required for welding (gas, welding current, welding cables, flux, welding wire, . . . ) are guided to the welding head via or along the cantilever. [0003] Such devices and methods are known, for example, from US 3,764,056 and US 10,040,141 B2. [0004] Document US 3,764,056 discloses a device by means of which pipes can be welded together starting from the inside of the pipes. Here, the cantilever, at whose tip the welding head...

AI Technical Summary

Problems solved by technology

[0007] But the described internal welder has some major problems: During the welding process a magnetic field is generated which deflects and / or turns the cantilever

[0008] The three-dimensional rotation, bending or deflection of the cantilever due to magnetic and thermal effects leads to a corresponding change in the position of the welding head, whereby the welding head is no longer in the desired position, which adversely affects the welding process and the weld seam geometry as well as the weld seam quality

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