Abstract: A device and a method for welding a welding stud to a substrate are disclosed. A welding current is applied to a welding stud between the welding stud and the substrate, whereby a material of the welding stud and the substrate is partially liquefied. The welding stud is then immersed into the solidifying material of the welding stud or the substrate in order to create a bond between the welding stud and the substrate.

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: A method controls a battery-powered welding device and a battery-powered welding device includes a battery having a battery voltage and a battery current and a welding controller containing a boost converter having at least a switch and a buck converter having at least one switch for controlling a welding current and a welding voltage supplied to a welding torch. A switch for bypassing the booster converter is connected to a switch controller designed to close the switch if the intermediate circuit voltage between the boost converter and the buck converter is less than or equal to the battery voltage and to open the switch if the boost converter is activated.

Abstract: The invention relates to a method for controlling a battery-powered welding device (1) and to a battery-powered welding device (1) comprising a battery (2) having a battery voltage (Uin) and a battery current (Iin) and comprising a welding controller (3) containing a boost converter (4) having at least a switch (5) and a buck converter (6) having at least one switch (7) for controlling a welding current (Tout) and a welding voltage (Uout) supplied to a welding torch (11). In order to achieve a high level of efficiency and dynamics and optimal welding characteristics, a switch (8) for bypassing the boost converter (4) is provided, which switch (8) is connected to a switch controller (9), which switch controller (9) is designed to close the switch (8) if the intermediate circuit voltage (Uzw) between the boost converter (4) and the buck converter (6) is less than or equal to the battery voltage (Uin), and to open the switch (8) if the boost converter (4) is activated.

Abstract: The invention relates to a portable welding arrangement (1) comprising a welding apparatus (2) having an accumulator (3), a power source (4), a welding control means (5) and a connection (7) for a welding torch (8), wherein the operating mode of the welding apparatus (2) can be changed between a standby mode and a welding mode, and comprising a charging apparatus (17) that can be connected to a power supply network (21) and to the welding apparatus (2) and has a charge controller (20) for charging the accumulator (3). The invention also relates to a corresponding method for operating such a portable welding arrangement. For optimum charging of the accumulator (3), the charge controller (20) of the charging apparatus (17) is designed to control the charge of the accumulator (3) of the welding apparatus (2) in accordance with the operating mode of the welding apparatus (2).

Abstract: The invention describes a method for transforming a liquid (8) into a gaseous state for a cutting process with a water-steam cutting device (1), consisting of a torch (6), an evaporator (25), an energy supply and a supply line (31) for a liquid (8), an appropriate temperature (27) being generated for evaporation of the liquid (8). To create a method of this type it is now provided that the temperature (27) is regulated during operation such that a sensor (28) senses the temperature (27) of the evaporator (25) and transmits it to a regulation unit which correspondingly supplies a heating element (24) with the energy necessary and by which a required pressure (34) of the liquid (8) supplied to the torch (6) is regulated so that an approximately constant temperature (27) of the evaporated liquid (8) is provided for a cutting process.

Abstract: The invention describes a method for transforming a liquid (8) into a gaseous state for a cutting process with a water-steam cutting device (1), consisting of a torch (6), an evaporator (25), an energy supply and a supply line (31) for a liquid (8), an appropriate temperature (27) being generated for evaporation of the liquid (8). To create a method of this type it is now provided that the temperature (27) is regulated during operation such that a sensor (28) senses the temperature (27) of the evaporator (25) and transmits it to a regulation unit which correspondingly supplies a heating element (24) with the energy necessary and by which a required pressure (34) of the liquid (8) supplied to the torch (6) is regulated so that an approximately constant temperature (27) of the evaporated liquid (8) is provided for a cutting process.

Abstract: The invention relates to a method for operation of a steam plasma burner (6), comprising a cathode (22) and an anode (24) in the form of a nozzle (23) for machining a workpiece (20), wherein during the operation a current is applied between the cathode (22) and the anode (24) and/or the workpiece (20) by means of a power supply (2). After starting a pilot arc between the cathode (22) and the anode (24) by approaching the steam plasma burner (6) to the workpiece (20), a working arc is formed between the cathode (22) and the workpiece (20) and the pilot arc is extinguished by switching off the power supply (2) to the anode (24) and the current increased to a given working current. In order to achieve an optimal operation of a steam plasma burner, the voltage (UUE) between the cathode (22) and the workpiece (20) is monitored during working operation and the power supply (2) reconnected to the anode (24) to reform the pilot arc when the voltage (UUE) exceeds a threshold (IUEs).