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).
