Abstract:
The invention describes a method of brazing workpieces (16) with a torch (10), in particular a plasma or welding torch, having an electrode (28), in which a transmitted and/or non-transmitted working arc supplied with power from a power source or a current source (2) is produced in order to generate a plasma beam from a delivered plasma gas, whereby at least one filler material (38) is fed to the seam region of the workpieces (16) to be joined. The filler material (38) is connected to the or to another power source or current source (39). To this end, one potential (40) of the power source or current source (39) is applied to the filler material (38) and the other potential (35, 41) to the workpieces (16). The power source or current source (39) is regulated in such a way that when the filler material (38) is lifted off the workpiece (16) an arc is prevented from being generated.
Abstract:
The invention relates to a welding method involving the use of a non-fusing electrode (12) according to which the electrode (12) is provided with power from a power source once the arc (11) between the electrode (12) and the workpieces (13, 14) to be joined has been ignited. The invention also relates to a tack welding method. The aim of the invention is to improve the quality of the weld seam in the starting phase of the welding process. To this end, the invention provides that before the actual welding process, a start program (22) is performed without the introduction of a filler material during which the electrode (12) is supplied with pulsed power in the form of current or voltage pulses over a presettable length of time (23) whereby causing the liquid molten bath to oscillate or vibrate, and that after the execution of the start program (22), the actual welding process is carried out during which the electrode (12) is preferably supplied with constant power.
Abstract:
The invention relates to a method of feeding welding wire (13) from a wire supply reel (14) to a welding torch (10), having at least one welding wire feeder (27) and an apparatus, in particular another welding wire feeder (28), for applying a feed force, in particular a main drive (29) and an auxiliary drive (30), whereby a feed force or a pressure force, acting on the welding wire (13) between the welding wire feeders (27, 28) is detected by a detection means, in particular a sensor, and compensated or limited. A deflection or lateral deflection of the welding wire (13) is detected on the basis of the feed force or pressure force on the welding wire (13) between the welding wire feeders (27, 28), in particular the main drive (29) and the auxiliary drive (30), and this deflection is used as information for regulating at least one of the welding wire feeders (27, 28).