Abstract: A multiple welding method using at least two consumable electrodes which enables stable welding processes at the electrodes and also less heat input into the parent material compared with the multiple pulse welding method. At each of the at least two electrodes a welding process includes a short-circuit welding phase and a hot-welding phase with higher heat input into the parent material relative to the short-circuit welding phase, the short-circuit welding phase and the hot-welding phase periodically alternating, and for the short-circuit welding phases of the welding processes of the at least two electrodes to be temporally synchronized on the basis of at least one defined first synchronization event per short-circuit welding phase.

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: In a method in which a welding process is carried out on a workpiece with a welding torch and to a welding device for carrying out the method, a welding current source is supplied in order to provide a welding voltage, and an electrical voltage is applied, at least temporarily, during the welding process to an external element of the welding torch, in particular to an outer wall of a gas nozzle, and a possibly occurring electrical contact between the external element and a further element, in particular the workpiece or a contact tube, is detected by the electrical voltage applied. The welding current source is electrically connected via at least one first resistor to the external element of the welding torch and the external element of the welding torch is connected to the electrical potential of the workpiece via at least one second resistor.

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 for providing a referenced distance signal which corresponds to the distance between a contact tip of a welding torch and a workpiece to be machined, includes adjusting an operating point on a predetermined welding characteristic, which is defined at least by a wire feed rate, a welding voltage and/or a welding current, and a CTWD distance between the contact tip and the workpiece; determining a target parameter value of at least one parameter dependent on the CTWD distance for the operating point; determining an actual parameter value of the at least one parameter by measuring at least one of the present wire feed rate, welding voltage and/or welding current; modifying the determined actual parameter value as a function of a calculated difference between the target parameter value and a predetermined reference value; and outputting the referenced distance signal corresponding to the modified actual parameter value to a position control system of a robot arm.

Abstract: A method for preparing an automated welding method for a welding process moves a welding torch with a consumable welding wire during a movement phase at a positioning speed from an actual to a desired start position of a welding seam, and bridges the distance of the welding wire end from the workpiece during a creep phase. The creep phase is at least partially carried out during the movement phase. The wire is moved toward the workpiece at a first specified forward feed speed until a first wire end-workpiece contact is detected, moved away from the workpiece after first contact detection and then recurrently moved away from the workpiece, and the contact is interrupted again upon detection of further contacts, and the movement of the welding wire towards the workpiece and movement away from the workpiece after the contact is repeated until the start position is reached.

Abstract: A multiple welding method and a welding device with at least two electrodes which ensure a welding quality that is as consistent as possible and stable welding processes. A test parameter is applied to one of the at least two welding current circuits before the start or after the end of the multiple welding method and at least one electrical. welding parameter is recorded in at least one other welding current circuit, with an electrically conductive connection between the at least two welding current circuits being detected if the recorded welding parameter is influenced by the test parameter and fulfills a predetermined test criterion. Alternatively, at least one electrical welding parameter is recorded in each welding current circuit during the multiple welding method, with an electrically conductive connection between the at least two welding current circuits being detected if the recorded welding parameters change simultaneously.

Abstract: Method and device for igniting and/or re-igniting a welding arc (SLB) between a wire end of a consumable welding wire electrode (SDE) and a workpiece (W), comprising the steps of: determining (S1) a distance (S) or time duration required by the wire end of the consumable welding wire electrode, SDE, until contact or short-circuit with a surface of the workpiece (W); and igniting (S2) the welding arc (SLB) with an ignition energy, EZ, which is set in dependence upon the determined distance (S) or time duration.

Abstract: Welding device (1) for welding a workpiece (W) in a welding process (SP) which comprises different types of welding process phases (SPP), in which the workpiece (W) is welded in each case with a welding arc (LB) which extends between a welding wire electrode (SDE) of the welding device (1) and the workpiece (W), wherein for the welding process phases (SPP) an arc parameter, LBP, of the welding arc (LB), in particular its arc length, LBL, can be set, wherein the welding device (1) comprises a controller (4) which, during a welding process transition (SPÜ) between different types of welding process phases (SPP) of the welding process (SP), effects a change in the arc parameter, ?LBP, of the welding arc (LB) corresponding to the arc parameters, LBP, set for the welding process phases (SPP) and at the same time automatically adapts at least one transition welding parameter, ÜSP, of a welding current source (2) of the welding device (1) in dependence upon the effected arc parameter change, ?LBP, in order to stabil

Abstract: A welding device has a central unit and a welding torch unit, which can be connected to the central unit. The central unit includes at least one welding current source for providing electric current needed to operate the welding torch unit and includes a control unit. The welding torch unit includes at least a first welding torch with a first welding wire and a second welding torch with a second welding wire. The control unit is configured to carry out a starting process in such a way that firstly a first arc ignition takes place at one of the two welding torches and after a waiting time since the first arc ignition has passed, a second arc ignition takes place at the other of the two welding torches, which until then was not ignited.

Abstract: In order to synchronize the at least two pulse welding processes performed simultaneously by welding devices in a multiple pulse welding process, the welding devices are connected to one another by a communication link and synchronization information is transmitted via the communication link from a transmitting welding device to at least one receiving welding device. The synchronization information is used in the receiving welding device to synchronize the pulse welding process performed by the receiving welding device with the pulse welding process performed by the transmitting welding device.

Abstract: A stable welding process for a welding method in which at least one welding device is used for welding. During the welding process carried out using the welding device, synchronization information is transmitted to the at least one welding device from at least one other electric device, in which a device current that changes over time flows in a device current circuit at least at one point in time, and the at least one welding device is designed to use the obtained synchronization information in order to ignore measurement values detected at the point in time for the measurement variable.

Abstract: A a multiple welding method having an improved starting process in which the control unit of the guide electrode starts welding-wire advancing of the guide electrode and sends a synchronization signal to the control unit of the trailing electrode when the guide electrode has moved a certain distance or for a certain time. The control unit of the trailing electrode starts welding-wire advancing of the trailing electrode in dependence on the received synchronization signal before the guide electrode touches the workpiece.

Abstract: Method and arrangement for carrying out a multiple pulse welding method in which an ideal ratio between the root-mean-square value of the welding current and the welding wire feeding speed is determined from a known relationship between the pulse frequency and the welding wire feeding speed, an actual root-mean-square value of the welding current is determined by the welding current with the pulse frequency to be set, and at least one pulsed current parameter of the welding current of the pulse welding process and/or the welding wire feeding speed of the pulse welding process is changed in order to change the actual ratio to the ideal ratio.

Abstract: In order to develop a welding process in such a way that uniform flaking of a weld seam can be guaranteed even with a higher number of short-circuit cycles, a specific number of short-circuit cycles is specified for the cold welding phase and the cold phase duration of the cold welding phase is determined for a number of short-circuit cycles that exceeds a specified limit cycle number, depending on a determined cold phase time and after the cold welding phase, there is a switch to the hot welding phase.

Abstract: A method for determining an interfering coupling between welding circuits (2-i) of a welding system (1) comprises the following steps: applying (S1) a predetermined current profile (SP) in a first welding circuit (2-1) of the welding system (1); detecting (S2) a voltage progression and/or current progression thus induced in a second welding circuit (2-2) of the welding system (1), and determining (S3) the interfering coupling on the basis of the current profile (SP) of the current applied in the first welding circuit (2-1) and of the voltage progression and/or current progression detected in the second welding circuit (2-2).

Abstract: Method for compensating an interfering influence on a welding current, provided by a welding power source (4) for welding a workpiece (3), from another welding power source (4?), comprising the steps of: (a) providing (SA) a compensation voltage (UKomp), which is calculated on the basis of a welding current progression provided by the other welding power source (4?); (b) subtracting (SB) the compensation voltage (UKomp) from a measured voltage (UMess), measured by a voltage measurement unit (8) of the welding power source (4), so as to determine a corrected measured voltage (U?Mess); and (c) regulating (SC) the welding current generated by the welding power source (4) as a function of the corrected measured voltage (U?Mess).

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: A method for providing a referenced distance signal which corresponds to the distance between a contact tip of a welding torch and a workpiece to be machined, includes adjusting an operating point on a predetermined welding characteristic, which is defined at least by a wire feed rate, a welding voltage and/or a welding current, and a CTWD distance between the contact tip and the workpiece; determining a target parameter value of at least one parameter dependent on the CTWD distance for the operating point; determining an actual parameter value of the at least one parameter by measuring at least one of the present wire feed rate, welding voltage and/or welding current; modifying the determined actual parameter value as a function of a calculated difference between the target parameter value and a predetermined reference value; and outputting the referenced distance signal corresponding to the modified actual parameter value to a position control system of a robot arm.

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.