Abstract: In order to improve the estimation of the arc voltage for use in a welding process, a welding line is modeled using a welding line model in the form of a transfer system with an order greater than one for estimating the arc voltage, and the estimated value of the arc voltage is determined as the difference between the measurement voltage at the measurement point and the determined line voltage drop.

Abstract: A method for automatically determining optimum welding parameters for carrying out a weld on a workpiece carries out test welds on test workpieces along test welding tracks, and at each test weld a welding parameter is changed automatically along the test welding track from a predefined initial value to a predefined final value. Each resulting test weld seam is measured along the test welding track with a sensor, and a sensor signal is received. A quality parameter characterizing each test weld seam is calculated from the sensor signal. A quality function for characterizing the test weld seam quality in accordance with the changed weld parameters is calculated from the quality parameter. An optimum quality function is ascertained, and the values for the optimum welding parameters are defined based on each quality parameter at this quality function optimum and the corresponding test weld track locations and saved.

Abstract: Method for scanning a workpiece surface (2A) of a metal workpiece (2), in which a blowtorch (3) having a welding wire electrode (4) is moved relative to the workpiece surface (2A) to determine scanning values and a wire end (4A) of the welding wire electrode (4) is repeatedly moved towards the workpiece surface (2A), in each case until contact with the metal workpiece (2) at a scanning position (P) on the workpiece surface (2A) of the metal workpiece (2) is detected, and the wire end (4A) of the welding wire electrode (4) is subsequently moved back, the blowtorch (3) detecting scanning values (d) at scanning positions (P), at least in some cases multiple times, to determine scanning measurement errors.

Abstract: A method automatically determines machining parameters for a machining process, in which a machining head is guided along a machining path over at least one workpiece to be machined, and, depending on the respective position along the machining path, certain machining parameters are selected from stored machining parameters on the basis of predefined conditions for machining the at least one workpiece, and a device machines a workpiece. The limit values for the machining parameters are determined during the machining process to be performed, and new machining parameters for the machining process to be performed are specified by taking these limit values into consideration.

Abstract: In a method and device for assessing the quality of a processing operation, a workpiece with specific processing parameters is processed along a processing trajectory. The (X), wherein the processing result is measured by at least one sensor and at least one sensor signal is recorded and at least one quality parameter is determined based on at least one sensor signal and the at least one quality parameter is compared with quality parameter threshold values to assess the quality of the processing result. During the assessment of the processing operation quality, changes made to the processing parameters from target values during the processing are automatically taken into consideration, in that, instead of the quality parameter threshold values, quality parameter threshold values adapted to the changes in the processing parameters are determined, and the at least one quality parameter for assessing the quality of the processing result is compared with the adapted quality parameter threshold values.

Abstract: In a method for defining welding parameters for a welding process on a workpiece, a welding torch fastened to a robot is guided over the workpiece along a predetermined welding path and predetermined welding parameters for processing the workpiece are set as a function of the position along the welding path. A welding device carries out a welding process. For the more exact definition of the welding parameters, before the welding process is carried out, at least one parameter representing the cooling is recorded as a function of the position along the welding path, and the at least one parameter representing the cooling along the welding path is considered for the welding process when defining optimized welding parameters as a function of the position along the welding path.

Abstract: A method and a device monitors a working process, in which a workpiece is worked continuously along each of at least one working path during at least one working time period using a working tool arranged on a collaborative robot. The device includes a sensor apparatus for monitoring the environment of the collaborative robot and a detection device for detecting an object in a manipulation region around each working path of the collaborative robot. A working machine has a monitoring device of this type. The detection device is connected to a device for emitting an instruction signal within an instruction phase in the event that an object is detected in the manipulation region of a working path of the collaborative robot, so that the working process can be continued along the at least one working path without interruption.

Abstract: The invention relates to a welding system and welding method, with a welding current source (1) for providing at least one process parameter (Pi(t)), that varies periodically with a period (T), a process controller (2) for specifying the period (T) of the at least one process parameter (Pi(t)), a power unit (3) and at least one port (4) for connecting to at least one sensor (5) for acquiring process variables (Gj(t)) and/or at least one process actuator (6) for influencing process parameters (Pi(t)), wherein the at least one sensor (5) and/or the at least one process actuator (6) can be triggered by the periodically varying process parameter (Pi(t)) according to at least one predefined trigger condition (B1).

Abstract: A method for automatically determining optimum welding parameters for carrying out a weld on a workpiece carries out test welds on test workpieces along test welding tracks, and at each test weld a welding parameter is changed automatically along the test welding track from a predefined initial value to a predefined final value. Each resulting test weld seam is measured along the test welding track with a sensor, and a sensor signal is received. A quality parameter characterizing each test weld seam is calculated from the sensor signal. A quality function for characterizing the test weld seam quality in accordance with the changed weld parameters is calculated from the quality parameter. An optimum quality function is ascertained, and the values for the optimum welding parameters are defined based on each quality parameter at this quality function optimum and the corresponding test weld track locations and saved.

Abstract: A method for establishing welding parameters for a welding process guides a welding torch along a predetermined welding path over the workpiece to be worked and sets welding parameters based on the respective path position for workpiece working. Before establishing the parameters, ideal parameters are determined by test welding processes on test workpieces along test welding paths, with a respective specific test workpiece position and arrangement relative to the gravitational acceleration vector and a specific tangential vector of the test path, and are stored. The parameters at the respective path position are established based on workpiece position and arrangement at the time relative to the welding path gravitational acceleration vector and tangential vector at the time by interpolation of the stored ideal parameter values for the determined positions and arrangements of the test workpieces relative to the gravitational acceleration vector and the specific tangential vectors of the test paths.

Abstract: In order to reduce the accumulation of moisture on a welding wire (2, 2?, 2?) arranged in a welding wire cartridge (1, 1a, 1b) or to remove existing moisture in a simple and reliable manner, it is provided that a flow (D1) of purging air supplied to the welding wire cartridge (1, 1a, 1b) is adjusted by a flow control unit (14), the purging air is supplied to the flow control unit (14) at a first pressure (p) and is discharged at a purging air discharge (24) of the welding wire cartridge (1, 1a, 1b) at a third pressure (pat), and at a purging air feed (15) of the welding wire cartridge (1, 1a, 1b) a second pressure (p1) at the purging air feed (15) that is lower than the first pressure (p) results from the adjusted flow (D1), the third flow (pat) and a flow resistance between the purging air feed (15) and the purging air discharge (24), the relative humidity (rF1) of the purging air being reduced by the relief of pressure from the first pressure (p) to the second pressure (p1).

Abstract: A method for establishing welding parameters for a welding process guides a welding torch along a predetermined welding path over the workpiece to be worked and sets welding parameters based on the respective path position for workpiece working. Before establishing the parameters, ideal parameters are determined by test welding processes on test workpieces along test welding paths, with a respective specific test workpiece position and arrangement relative to the gravitational acceleration vector and a specific tangential vector of the test path, and are stored. The parameters at the respective path position are established based on workpiece position and arrangement at the time relative to the welding path gravitational acceleration vector and tangential vector at the time by interpolation of the stored ideal parameter values for the determined positions and arrangements of the test workpieces relative to the gravitational acceleration vector and the specific tangential vectors of the test paths.

Abstract: A method and an apparatus for determining the temporal curve of the voltage (ue(t)) at the electrodes (3) of a spot welding gun (1) during a spot welding process as an indicator of the welding quality, wherein the electrodes (3) are fastened to gun arms (2) that can be moved relative to each other are provided. The apparatus includes a device (9) for measuring a measuring voltage (um(t)) between the electrodes (3), that measuring device (9) being connected to measuring leads (6) extending along the gun arms (2), and further includes a compensating coil (7) for measuring a compensating voltage (uk(t)) for compensating measuring errors within measuring leads.

Abstract: In order to reduce the accumulation of moisture on a welding wire (2, 2?, 2?) arranged in a welding wire cartridge (1, 1a, 1b) or to remove existing moisture in a simple and reliable manner, it is provided that a flow (D1) of purging air supplied to the welding wire cartridge (1, 1a, 1b) is adjusted by a flow control unit (14), the purging air is supplied to the flow control unit (14) at a first pressure (p) and is discharged at a purging air discharge (24) of the welding wire cartridge (1, 1a, 1b) at a third pressure (pat), and at a purging air feed (15) of the welding wire cartridge (1, 1a, 1b) a second pressure (p1) at the purging air feed (15) that is lower than the first pressure (p) results from the adjusted flow (D1), the third flow (pat) and a flow resistance between the purging air feed (15) and the purging air discharge (24), the relative humidity (rF1) of the purging air being reduced by the relief of pressure from the first pressure (p) to the second pressure (p1).

Abstract: The invention relates to a method and a device for determining a direct current (i(t)) flowing in a conductor (7) and having an amplitude greater than 500 A, which direct current (i(t)) is composed of a number of time-dependent partial currents (ii(t)) flowing in individual conductors (8) with switching elements. To create a drift-free measured value, it is provided that at least one Rogowski coil (10) is arranged around at least one of the individual conductors (8) for the induction of a partial voltage (ui(t)) through the at least one partial current (ii(t)), wherein the individual conductor (8) is formed by a path of a rectifier (6) on a secondary side of a transformer (5) with central tapping, the at least one integrator (11) is designed for integration of the at least one partial voltage (ui(t)), and the at least one integrator (11) is connected to an evaluation unit (12) for determining the direct current (i(t)).

Abstract: A method and an apparatus for determining the temporal curve of the voltage (ue(t)) at the electrodes (3) of a spot welding gun (1) during a spot welding process as an indicator of the welding quality, wherein the electrodes (3) are fastened to gun arms (2) that can be moved relative to each other are provided. The apparatus includes a device (9) for measuring a measuring voltage (um(t)) between the electrodes (3), that measuring device (9) being connected to measuring leads (6) extending along the gun arms (2), and further includes a compensating coil (7) for measuring a compensating voltage (uk(t)) for compensating measuring errors within measuring leads.

Abstract: The invention relates to a method and a device for determining a direct current (i(t)) flowing in a conductor (7) and having an amplitude greater than 500 A, which direct current (i(t)) is composed of a number of time-dependent partial currents (ii(t)) flowing in individual conductors (8) with switching elements. To create a drift-free measured value, it is provided that at least one Rogowski coil (10) is arranged around at least one of the individual conductors (8) for the induction of a partial voltage (ui(t)) through the at least one partial current (ii(t)), wherein the individual conductor (8) is formed by a path of a rectifier (6) on a secondary side of a transformer (5) with central tapping, the at least one integrator (11) is designed for integration of the at least one partial voltage (ui(t)), and the at least one integrator (11) is connected to an evaluation unit (12) for determining the direct current (i(t)).