Internal welding of pipes and profiles

A device for internal welding of pipes and profiles, comprising:

• an elongated cantilever arm which is attached at a first end to a suspension and which is selectively inserted into a pipe or profile to be welded, the cantilever arm having a second end on which a welding head is movably attached;
• a control device for moving the welding head;
• one or more lasers fixedly attached to the suspension and distally from the welding head;
• one or more cameras attached to the welding head;
• wherein one or more laser beams emitted by the one or more lasers proximate the first end are respectively directed at and recognizable by the one or more cameras at the second end of the cantilever arm;
• and
• an evaluation module, which is configured to evaluate directional changes in relative positions of the one or more laser beams with respect to movement of the second end of the cantilever arm that is detected by the one or more cameras to generate a signal from the directional changes in the relative positions of the one or more laser beams and to transmit the signal to the control device for moving the welding head to compensate for such directional changes.