Abstract: A welding or cutting torch includes a torch head, a heating nozzle detachably fastened onto a front part of the torch head and a cutting nozzle, which is received in the heating nozzle and which rests with a rear end face on a front end face of the torch head. The cutting nozzle has a shoulder with a surrounding contact face, which is turned away from a rear end face and which rests on a surrounding mating face of the heating nozzle.

Abstract: A method for monitoring a flame cutting process includes a preheating phase, a piercing phase following the preheating phase and a cutting phase following the piercing phase, wherein a cutting torch applies a flame generated by combustion of a gas mixture to an electrically conductive workpiece and wherein an electric current flowing between an electrically conductive part of the cutting torch and the workpiece is measured by a current measuring device during a measuring period. An ignition point at which piercing of a hole through the workpiece using the flame starts due to oxidation of the workpiece is detected by a change in the measured current.

Abstract: A method for monitoring a flame cutting process includes a preheating phase, a piercing phase following the preheating phase and a cutting phase following the piercing phase, wherein a cutting torch applies a flame generated by combustion of a gas mixture to an electrically conductive workpiece and wherein an electric current flowing between an electrically conductive part of the cutting torch and the workpiece is measured by a current measuring device during a measuring period. An ignition point at which piercing of a hole through the workpiece using the flame starts due to oxidation of the workpiece is detected by a change in the measured current.

Abstract: A welding or cutting tool for welding or cutting electrically conductive workpieces includes a nozzle arranged on a tool tip for discharging a welding or cutting beam and a nozzle cap which at least partly surrounds the nozzle, is open towards the tool tip, and has an electrode that forms a capacitance with the respective workpiece and an insulating element that electrically insulates the electrode from the other components of the tool. The electrode consists of a first electrically conductive ceramic material and is formed integrally with the insulating element, which consists of a second electrically insulating ceramic material.

Abstract: A welding or cutting tool for welding or cutting electrically conductive workpieces includes a nozzle arranged on a tool tip for discharging a welding or cutting beam and a nozzle cap which at least partly surrounds the nozzle, is open towards the tool tip, and has an electrode that forms a capacitance with the respective workpiece and an insulating element that electrically insulates the electrode from the other components of the tool. The electrode consists of a first electrically conductive ceramic material and is formed integrally with the insulating element, which consists of a second electrically insulating ceramic material.

Abstract: The invention relates to a drive apparatus (10) for the linear movement of a processing tool with respect to a workpiece, having a tool holder (18) which is fixed on a carriage (16) and is intended for the fastening of the processing tool, having a stationary guide device (12) in which the carriage (16) is guided such that it can be displaced in a vertically linear manner, and having a drive device (42) with a first force transmission means (46) which, in an engaged position, engages with a second force transmission means (40) connected to the carriage (16) in order to move the carriage (16). According to the invention, it is provided that the drive device (42) is mounted in the guide device (12) such that it can be moved between a release position, in which the force transmission means (40, 46) do not engage with one another, and the engaged position in such a way that the gravitational force of the drive device (42) causes a movement from the release position into the engaged position.

Abstract: A welding or cutting device for welding or cutting electrically conductive work pieces has a pipe that accommodates feed lines, a nozzle for exit of a welding or cutting jet, such as a flame, for example, disposed at an end of the pipe, forming a device tip with its free end, and an inductive sensor device for measuring the distance between the device tip and the work piece. The sensor device has at least one magnetic coil, the windings of which run about a longitudinal device axis. The sensor device is a separate module, which is pushed onto the pipe and/or the nozzle, and releasably connected with the pipe and/or the nozzle.

Abstract: The invention relates to a device for machining, particularly for cutting, of electrically conductive workpieces using a machining tool (10), which can be displaced back and forth toward and away from a workpiece by means of a drive unit and which comprises an electrically insulated, metallic tool head (12) forming a first capacitance (C1) with the workpiece, and comprising an analysis unit (14) for analyzing a characteristic value dependent on the first capacitance (C1). The invention provides that a metallic connecting element (18) is attached to the tool head (12), the element being connected to the analysis unit (14) and forming a second capacitance (C2) with the tool head (12).

Abstract: A method is for setting at least one predetermined distance between a machine tool (10) and a metallic or non-metallic electrically conductive workpiece (12) according to which a capacitive and/or inductive sensor (16) fixed to the machine tool (10) while facing the workpiece (12). The machine tool (10) is displaced with constant speed toward the workpiece (12) by means of a drive device, and a sensor signal is output at predetermined time intervals by means of a data processing unit (24). The sensor signal has a characteristic quantity that continuously changes in a non-linear manner according to the distance of the machine tool (10) from the workpiece (12). The data processing unit (24) compares each read out value of the characteristic quantity with a comparative value read out before at a predetermined number of time intervals and calculates the difference between the values that are compared with one another.