Abstract: A thermal working tool (1) is movable along a workpiece surface (7) and includes a torch head (2) which has exchangeably mounted thereon cutting or welding tools (3; 4; 5) extending between the torch head (2) and the workpiece surface (7). A distance control for setting a predetermined working distance (A) between the working tool (1) and the workpiece surface (7) is carried out by a magnetic system, an alternating magnetic field being produced in a sensor body with ferromagnetic properties above the workpiece surface (7). The torch head (2) and at least one of the cutting or welding tools (3; 4; 5) contain ferromagnetic material and form at least part of the sensor body (2; 3; 4; 5). The magnetic field produced is sensed by two measuring coils, and is used for controlling the working distance (A).

Abstract: In a known thermal working machine for working a workpiece, a thermal working tool (1) is provided that is movable along the workpiece surface (7) and comprises a torch head (2) which has exchangeably mounted thereon cutting or welding tools (3; 4; 5) extending between the torch head (2) and the workpiece surface (7). A distance control for setting a predetermined working distance (A) between the working tool (1) and the workpiece surface (7) is carried out by means of a magnetic system, an alternating magnetic field being produced in a sensor body with ferromagnetic properties above the workpiece surface (7). Starting from this, in order to permit a local measurement of even large working distances, the invention suggests that the torch head (2) and at least one of the cutting or welding tools (3; 4; 5) should contain ferromagnetic material and form at least part of the sensor body (2; 3; 4; 5).

Abstract: The invention relates to a device for contact-free data gathering from a thermal machining system with at least one machining tool and one workpiece which is characterized in that the workpiece is connected to an alternating voltage generator and receives an alternating voltage signal, as a result of which it functions as a transmitter and in that, across from the workpiece, there is a receiver which is connected to an evaluation unit which picks up field changes.

Abstract: A band welding installation includes a welding machine having a control device and a welding torch for joining ends of pieces in a band processing line transverse to the direction of the band run. At least two sensor units are coupled ahead of the torch for determining the seam beginning and end, and for guiding the torch along the joint center, as well as controlling the torch angle of inclination for different band thicknesses.