Abstract: A MIG/MAG welding torch body includes a second channel, which is arranged coaxially to the central channel, and a further third channel, which is arranged coaxially to the second channel, wherein a connection is provided between the second channel and the third channel. The first channel has an orifice in the center of the receiving part, the second channel has an orifice on the lateral side of the receiving part, and the third channel has an orifice on the lateral side of the receiving part.

Abstract: A photovoltaic inverter has a DC input for connection to a DC source, a DC-DC converter, an intermediate circuit, a DC-AC converter, an AC disconnector, a control device, an AC connection for connection to a supply network and, if present, a consumer, a battery stage, and a battery connection for connection to a buffer battery, and a method operates a photovoltaic inverter of this kind. A switched-mode power supply is connected on the input side to the AC connection and on the output side to the battery stage so that, if the DC source is deactivated, the intermediate circuit can be charged up to a threshold value via the switched-mode power supply and the battery stage, whereupon the AC disconnector can be actuated and the photovoltaic inverter can be connected to the supply network.

Abstract: The invention relates to a method for testing a disconnection point (12) of a photovoltaic inverter (1) and to a photovoltaic inverter (1) of this type. According to the invention, in a testing mode, an auxiliary voltage (U_Lx) is applied between the input (E_Lx) of each line (Lx) of the disconnection point (12) and an intermediate circuit potential (M), in each case, the first switching contacts (SW_Lx,1) are closed and the second switching contacts (SW_Lx,2) are opened alternately and vice versa, according to a switching pattern, and, for each switching pattern, the voltages (U_Lx,GD; U_MN) between the output (A_Lx) of each line (Lx) of the disconnection point (12) and the intermediate circuit potential (M) are measured, and the functionality of each switching contact (SW_Lx,j) is derived from the measured voltages (U_Lx,GD; U_MN).

Abstract: A welding control system is provided for monitoring welding operations of a plurality of welding units within a production facility configured to provide weld data associated with the respective mechanical entities, including a determination unit configured to determine for each type of mechanical entity a corresponding welding error rate on the basis of weld data received from welding units of the production facility, a calculation unit configured to calculate for each type of mechanical entity the number of faulty mechanical entities of the respective entity type depending on the number of mechanical entities used and configured to weight the calculated number of faulty mechanical entities of the respective entity type with a predetermined manufacturing effort value.

Abstract: The invention relates to a method for testing a disconnection point (12) of a photovoltaic inverter (1) and to a photovoltaic inverter (1) of this type. According to the invention, in a testing mode, an auxiliary voltage (U_Lx) is applied between the input (E_Lx) of each line (Lx) of the disconnection point (12) and an intermediate circuit potential (M), in each case, the first switching contacts (SW_Lx,1) are closed and the second switching contacts (SW_Lx,2) are opened alternately and vice versa, according to a switching pattern, and, for each switching pattern, the voltages (U_Lx,GD; U_MN) between the output (A_Lx) of each line (Lx) of the disconnection point (12) and the intermediate circuit potential (M) are measured, and the functionality of each switching contact (SW_Lx,j) is derived from the measured voltages (U_Lx,GD; U_MN).

Abstract: A welding current source for providing a welding current and a welding voltage at an output in order to carry out an arc welding process includes an input-side rectifier, an inverter, which is operated with a switching frequency, a transformer having a primary winding and at least two secondary windings, at least two rectifiers arranged between the secondary windings and the output, and at least one capacitor and one load resistor at the output. At least one current-limiting reactor is arranged on the second secondary winding and the load resistor for discharging the capacitor, which can be charged by the current-limiting reactor, the current-limiting reactor, and the capacitor are dimensioned in such a way that the maximum value of the no-load voltage at the output is greater than the voltage corresponding to the transmission ratio of the primary winding to the secondary winding of the transformer.

Abstract: The invention relates to an arc welding method using a consumable welding wire (1), wherein in successive welding cycles (SZ) during a welding process (Pi) a certain welding current (I(t)) is applied to the welding wire (1) and the welding wire is moved with a certain wire conveying speed (v(t)) towards a workpiece (2) to be processed. The aim of the invention is to further improve the stability of the welding method. The aim is achieved, according to the invention, in that in the event of a change of the welding process (P1) to a welding process (P2) with an increased mean wire conveying speed (vmean) during a welding cycle (SZ) and/or with an increased mean welding current (Imean) during a welding cycle (SZ), a lowering phase (AP) is initiated, wherein in the lowering phase (AP) the welding current (IA(t)) is lowered for a specified duration (?tA).

Abstract: Circuit arrangement 1 for securely switching inverter devices 2 of a system by a common emergency switch 3 which is connected to a switching signal input 4 of one of the inverter devices 2 which is configured as a master of the system and comprises a switching signal output 5, other inverter devices 2 of the system configured as a slave being connected to the one inverter device via switching signal lines 6, wherein the inverter devices 2 configured as a slave together with the inverter device 2 configured as a master form a switching chain which is automatically switched upon actuation of the emergency switch 3.

Abstract: The aim of the invention is to detect an arc in an assembly for transmitting a direct voltage. This aim is achieved by a communication transformer having a primary winding and a secondary winding, the secondary winding being connected to a transmitting device, which is designed to impress a communication signal onto the secondary winding of the communication transformer, and the primary winding being connected to one of the direct voltage lines in order to feed a communication signal transformed by the communication transformer to one of the direct voltage lines. In order to detect, in the assembly, the arc signal caused by an arc, the secondary winding is connected to an arc detection unit, which is designed to detect an arc signal transformed by the communication transformer.

Abstract: The invention relates to a welding device (1) having a welding torch (2), a feeder (3) for feeding a melting filler material (4) at a feed rate (v) to a weld (S), where the filler material (4) is melted with the aid of an electric arc (L), and a pre-heater (9) for heating the filler material (4) upstream of the weld (S) by means of a laser beam (7) having a laser power (P) and generated in a laser device (6). For space-saving and safe heating of the filler material (4) upstream of the weld (S), the pre-heater (9) includes a feed channel (5) for the filler material (4), and at least one deflector (8) is attached to the pre-heater (9) for deflecting the laser beam (7) to the filler material (4) in such a way that the laser beam (7) strikes the filler material (4) inside the feed channel (5) of the pre-heater (9).

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: In order to achieve a reliable constant contact in a welding torch with a contact sleeve with a wire forming unit and to reduce the frictional forces for the wire forming process three ball bearing-mounted rollers (4a, 4b, 4c) are arranged one behind the other in the longitudinal direction (x) of the welding torch (10) in the wire forming unit (1), whereas the central roller (4b), when viewed in the longitudinal direction (x), is offset in the wire forming unit (1) relative to the two outer rollers (4a, 4c), when viewed in the longitudinal direction (x), by a transverse offset (V) in a transverse direction (y) transverse to the longitudinal direction (x) in order to form a zig-zag-shaped path for the welding wire (3) through the wire forming unit (1), wherein the axial distance (A) between the two outer rollers (4a, 4c) when viewed in the longitudinal direction (x) is maximally 35 mm, preferably maximally 30 mm, more preferably maximally 20 mm.

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: The invention concerns an inverter housing (15) with at least two housing parts (16, 17), which can be detachably connected to one another by way of fastening elements (19), with a connection area (21), and an operation area (20) provided on a housing part (16, 17).

Abstract: The invention relates to a method for contactless ignition an arc (L) between an electrode (3) and a workpiece (4) which is to be welded, for carrying out a welding process, wherein a welding current (I) and a welding voltage (U) are provided at an output (2) of a welding current source (1), wherein the welding current source (1) contains a resonance converter (5) for generating a periodically varying, preferably substantially sawtooth-shaped, open circuit welding voltage (ULL) with voltage maxima (ULL,max) which recur periodically with a repetition rate (fw) and a welding current source (1) for carrying out the igniting process.

Abstract: The invention concerns an inverter housing (15) with at least two housing parts (16, 17), which can be detachably connected to one another by way of fastening elements (19), with a connection area (21), and an operation area (20) provided on a housing part (16, 17).

Abstract: A portable welding arrangement includes a welding apparatus having a storage battery, a power source, a welding control means and a connection for a welding torch. The operating mode of the welding apparatus can be changed between a standby mode and a welding mode. The portable welding arrangement includes a charging apparatus that can be connected to a power supply network and to the welding apparatus and has a charge controller for charging the storage battery. In a method for operating such a portable welding arrangement, for optimum charging of the battery, the charge controller of the charging apparatus is designed to control the charge of the accumulator of the welding apparatus in accordance with the operating mode of the welding apparatus.

Abstract: Energy supply system includes at least one local energy supply unit, at least one local energy consumption unit at least one local energy store, and a control unit which controls the energy consumption, by the at least one local energy consumption unit of the energy supply system, of the volume of energy generated by the at least one local energy generation unit, and the volume of energy stored in the at least one energy storage unit. After detecting at least one predictable future event which will influence the volume of energy generable by the energy consumption units and/or the volume of energy which can be drawn from the energy supply network and/or the volume of energy consumed by the energy consumption units, the control unit dynamically adapts an energy reserve, stored in the at least one local energy store, as a function of the detected events.

Abstract: A short circuit welding method with successive welding cycles with a respective arc phase and short circuit phase includes controlling at least the welding parameters welding current and feed speed of a melting electrode and feeding the electrode toward of a workpiece at a predetermined forward final speed at least during part of the arc phase and away from the workpiece at a predetermined rearward final speed at least during part of the short circuit phase. A device carries out this method. A change in the feed speed and a rearward final speed are predetermined and a welding current is controlled to complete the short circuit phase after reaching the rearward final speed and after 3 ms at the latest and repeat every 8 ms at the latest. The welding parameters are controlled such that the welding cycle duration?8 ms, resulting in a welding frequency?125 Hz.