Welding assembly having a welding device and a welding component connected to the welding device

Abstract

In order to reduce the outflow of HF ignition energy via a data line (20) for data transmission between a welding device (2) and other parts of a welding assembly (1), a decoupling device (35) is provided, in which a first data line section (20a) of the data line (20) is connected to a first coupling link (21a), and a second data line section (20b) of the data line (20) is connected to a second coupling link (21b), the first coupling link (21a) and the second coupling link (21b) being connected to each other via a wireless coupling section (23) for galvanic separation of the data line (20), and a separate current supply (22a, 22b) being provided for each of the first coupling link (21a) and the second coupling link (21b), the current supply (22a, 22b) of the first coupling link (21a) and the second coupling link (21b) being designed to be energized for the HF ignition voltage (u Z ) are decoupled from one another by the HF voltages on the data line (20).

Description

Technical Field

[0001] The invention relates to a welding assembly comprising a welding device and a welding component connected to the welding device, and comprising an HF (high frequency) ignition unit for generating an HF ignition voltage or HF ignition energy for igniting an arc for welding, wherein a data line is provided between the welding device and the welding component, data communication between the welding device and the welding component is achieved via the data line, and a decoupling device for the HF voltage is provided on the data line. Background Art

[0002] Various arc welding methods are known, such as MIG (metal inert gas), MAG (metal active gas), WIG (tungsten inert gas), MMA (manual metal arc), WAAM (arc additive manufacturing), or plasma welding. MIG, MAG, MMA, and WAAM welding use a fusible electrode that also serves as a welding filler. WIG and plasma welding use a non-fusible electrode, and a separate filler is supplied to the arc as needed during welding. Similarly, different methods are known for igniting the arc at the start of welding. Essentially, contact ignition involves establishing contact between the welding electrode and the workpiece to be welded. After contact, the arc is ignited by current flowing through the welding electrode when the electrode is lifted from the workpiece. In non-contact ignition, the welding electrode is spaced apart from the workpiece to be welded, and a high-frequency voltage is applied to the welding electrode to ionize and conduct the gas space between the welding electrode and the workpiece surface, thereby igniting a stable arc due to the resulting cascade effect. In such high-frequency ignition (HF ignition), a high-voltage transformer is typically used, the secondary side of which is arranged, for example, in the welding line connected to the welding electrode or in parallel between two welding lines, in order to couple the HF ignition voltage (typically a high voltage in the range of 1 kV to 20 kV) into the welding line or in parallel between the two welding lines. Various welding methods and ignition methods can be used for both manual and robotic welding.

[0003] To ensure the most stable HF ignition possible, it is advantageous if the HF ignition energy used for the HF ignition spark between the welding electrode and the workpiece is used to ignite the arc and does not flow away completely or partially as leakage current (slip current) and / or as leakage current via other undesirable conductive and / or normally non-conductive paths. Due to the very high HF ignition voltage, even inherently non-conductive paths can become conductive and cause leakage currents or leakage currents. Paths in which leakage currents or leakage currents may occur are generally referred to below as leakage paths. For safety reasons, the permissible HF ignition energy is limited by standards, such as EN 60974-3 for arc ignition and stabilization devices, so that the ignition energy cannot be increased arbitrarily to compensate for possible losses due to leakage paths. Therefore, it is important to reduce or eliminate the outflow of HF ignition energy via leakage paths. For this purpose, it is already known to arrange a blocking choke in the welding line between the power unit of the welding device and the high-frequency generator for generating the HF ignition voltage, in order to direct all the HF ignition energy to the welding electrode and prevent it from escaping through the welding line into the welding device, as presented, for example, in EP 1 704 012 B1. However, such blocking chokes can only be used meaningfully in electrical lines through which low-frequency useful signals flow, because otherwise the blocking choke would also undesirably attenuate or completely block high-frequency useful signals. Such low-frequency useful signals can occur, for example, in the welding line (welding current) or in the power supply line.

[0004] Modern welding torches are also typically equipped with electronics that are supplied with a supply voltage from the welding equipment via a power supply line. The electronics in the welding torch are used, for example, to control the welding process. Operating elements for the welder, such as keys, buttons, and knobs, can be located on the welding torch. These operating elements can be manipulated by the welder to influence the welding process, for example, by setting or adjusting welding parameters. Similarly, display elements, such as monitors and lamps, can be provided on the welding torch to show the welder information about the welding process or the welding process. Furthermore, measuring elements can be provided in the welding torch or in the wire feed, for example, to measure arc voltage or welding current. The measured values ​​detected by the measuring elements are transmitted to the welding equipment via a data line. For example, arc voltage is required for active regulation of the wire feed (either a fused electrode or a separate filler material). A measuring line can also be routed from the welding torch to the welding equipment to measure the arc voltage in the welding equipment. Such a measuring line can also be considered a data line for the purposes of the present invention. Thus, analog or digital data or signals can be transmitted from operating elements or display elements or other parts of the welding assembly via the data line.

[0005] For data lines in welding equipment, special data cables with electrical shielding and preferably twisted wires must be used, particularly when high data transmission speeds from 1 Mbit / s up to multiple Gbit / s and stable data transmission are required. This is because the welding current can have high rates of change (e.g., steep welding current edges), which can lead to inductive interference or coupling into the data line. However, since, for example, the HF ignition voltage in the hose package can capacitively couple into the data line shield, the usually grounded electrical shield of the data line is an ideal electrical leakage path. When using unshielded data lines, HF coupling into the core of the data line can occur, allowing HF ignition energy to escape from the welding electrode and potentially causing interference in data communication. The use of blocking chokes for measuring lines is already known, for example from EP 1 021 269 B1, in which the blocking choke of the measuring line is wound around the secondary side of the high-voltage transformer used for HF ignition. Blocking chokes reduce high-frequency alternating currents, thereby reducing the outflow of HF ignition energy. However, the low-pass effect of the choke also limits the possible information transmission via the measurement line, for example by attenuating or limiting the frequency range of the measurement signal. However, shielded or unshielded data lines can also be wound around blocking chokes to reduce the outflow of ignition energy via the data line. However, even with blocking chokes in the data line, HF ignition energy is lost due to the forced high-frequency magnetization of the blocking choke.

[0006] Another problem with blocking chokes in shielded data lines is that, due to the design of the shield and the data line, the bending radius of the data line must not fall below a certain value, as specified by the manufacturer, in order to prevent the shield from bending and damaging. However, this results in a blocking choke formed by winding a core with the shielded data line, which occupies a large structural size. This makes the blocking choke bulky, expensive, and, in most cases, unusable. Therefore, blocking chokes are also generally effective in shielded data lines for data transmission (in which higher-frequency useful signals occur), but due to the minimum bending radius of the shielded data line, they quickly become bulky, expensive, and heavy.

[0007] Therefore, the use of blocking chokes for a data line (or also for a plurality of data lines) is less than ideal for a number of reasons. Summary of the Invention

[0008] It is therefore an object of the present invention to reduce the outflow of HF ignition energy via data lines for data transmission between the welding device and other parts of the welding assembly.

[0009] This object is achieved by the features of the independent claims.

[0010] The galvanic separation of the data lines, including any shielding of the data lines, prevents possible HF leakage paths through the data lines and reduces the escape of HF ignition energy. To prevent leakage paths from forming through the current supply of the coupling element, the coupling element is supplied with electrical energy by separate current supplies that are designed to be decoupled from one another for a given HF voltage on the data lines. This prevents HF ignition energy from escaping through the current supplies. This allows for effective HF decoupling of the data lines without blocking inductors in the data lines.

[0011] Advantageously, the power supply of the first coupling element and / or the second coupling element is designed as a battery. The separate batteries can be designed to be decoupled from the HF voltage in a simple manner, for example by a sufficient spatial separation of the battery electrodes, in order to prevent the formation of spark paths.

[0012] In a particularly advantageous embodiment, a supply line carrying the supply voltage is used for the current supply of the coupling element. To this end, a blocking choke is arranged in the supply line, which is designed to decouple its two sides for a given HF voltage on the supply line, and the current supply of the first coupling element taps off the supply voltage on one side of the blocking choke. Advantageously, the current supply of the second coupling element taps off its supply voltage on the other side of the blocking choke.

[0013] In an equally advantageous embodiment, optical technology is used to decouple the current supply. To this end, the current supply of the first coupling element and / or the second coupling element is implemented as a photovoltaic element, and a light source is provided that applies light to the photovoltaic element. Advantageously, the light source is powered by the current supply of the first coupling element, and the photovoltaic element is provided as the current supply of the second coupling element. This allows the current supply to be decoupled via an optical path for the HF voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Refer to the following Figures 1 to 7 The present invention will be described in more detail. These figures show advantageous embodiments of the present invention by way of example and in a schematic and non-limiting manner.

[0015] Figure 1 A welding assembly is shown with an HF ignition and a data line for data communication between a welding device and a welding component connected to the welding device via the data line.

[0016] Figure 2 shows a decoupling device according to the invention,

[0017] Figure 3 The design scheme of the coupling link is shown.

[0018] Figure 4 shows a decoupling device according to the invention with power supply via a power supply line, Figure 5 and Figure 6 shows a design of a coupling element with a battery, and

[0019] Figure 7 The HF decoupling of the current supply in the optical path is shown. DETAILED DESCRIPTION

[0020] exist Figure 1 Schematically and illustratively, a welding assembly 1 for WIG welding is shown. A welding electrode 4, in this case a non-fusible welding electrode, on a welding torch 3 is connected to the welding device 2 via an electrode line 5, for example, via an electrode current socket 8 on the welding device 2. A workpiece 7 to be welded is connected to the welding device 2 via a ground line 6, for example, via a ground current socket 9 on the welding device 2. During welding, an arc burns between the welding electrode 4 and the workpiece 7, and a welding current generated by a power unit 10 in the welding device 2 flows. A welding control unit 11 is provided in the welding device 2, which controls and monitors the welding process. A user interface (not shown) may also be provided on the welding device 2, through which a user can select, set, or change welding parameters for the welding process. The welding torch 3 is connected to the welding device 2 via a welding control line 12, for example, via a control line socket 13 on the welding device 2. Operating elements 14 on the welding torch 3, such as buttons, a display, or rotary knobs, can be connected to the welding control unit 11 via the welding control line 12, enabling unidirectional or bidirectional data exchange between the welding device 2 and the welding torch 3. Via these operating elements 14 on the welding torch 3 , welding parameters of the welding process can likewise be selected, set or changed and / or the set welding parameters can be displayed.

[0021] Typically, the electrode lines 5 and the welding control lines 12 are arranged in a common hose package 25. Further lines, such as lines for shielding gas, coolant lines for torch cooling, welding wire lines, etc., can also be arranged in such a hose package 25 in a sufficiently known manner.

[0022] exist Figure 1In the embodiment shown in FIG, a wire feed unit 15 is also provided, which supplies welding wire 16 to the welding location. The wire feed unit 15 can be integrated into the welding device 2, but can also be designed as a separate unit. The wire feed unit 15 can be controlled by the welding control unit 11 via a wire control line 18 to carry out the welding process. The wire control line 18 can be plugged into a wire control line socket 29 on the welding device 2, particularly in the case of an external wire feed unit 15, which in turn can be connected to the welding control unit 11. In other welding assemblies, the welding wire can also be guided in a hose package 25 and can also function as a fusible welding electrode.

[0023] The welding control circuit 12 may include various circuits. For example, a power supply circuit (also multi-pole) may be provided to supply electrical energy to the operating element 14 on the welding torch 3. In order to transmit data between the welding device 2 and the welding torch 3, a data line 20 (in the welding control circuit 12) may also be provided. Figure 1 The data lines (not shown) can be used to implement a data communication bus, via which data can be transmitted using a predefined communication protocol. Measurement or signal lines can also be provided as data lines, for example, for detecting the voltage potential on the welding electrode 4 or for transmitting analog signals.

[0024] Likewise, the wire control circuit 18 may include different circuits. For example, a power supply circuit (which may also be multi-pole) may be provided for powering the wire feeding unit 15 via the welding device 2. The wire control circuit 18 may also include a data circuit 20 (in Figure 1 Not shown), a data communication bus can be realized via the data line, via which data for controlling and / or regulating the wire feed can be transmitted unidirectionally or bidirectionally with a preset communication protocol.

[0025] In order to ignite (also in the sense of re-igniting) the arc for welding, in addition to a possible no-load voltage increase (not shown) and a possible auxiliary voltage source (not shown), a high-frequency (HF) voltage source 19 can be provided in the HF ignition unit 17, which generates a voltage with a voltage amplitude u Z HF ignition voltage in the form of ignition voltage pulses u Z , the ignition voltage is coupled into the welding circuit, usually the electrode circuit 5. Figure 1 In the embodiment of the present invention, an HF voltage source 19 is provided, the output voltage of which is stepped up and converted to an HF ignition voltage u by means of an HF transformer. Z In this embodiment, the secondary winding of the HF transformer is arranged in the line between the power unit 10 and the electrode current socket 8 and the HF ignition voltage u Zis coupled into the electrode line 5. However, the HF ignition voltage u Z It can also be applied between the electrode line 5 and the ground line 6. The HF ignition unit 17 does not necessarily have to be arranged in the welding device 2, but can also be arranged as a separate component outside the welding device 2 or in the wire feed unit 15.

[0026] Through the HF ignition voltage u Z The gas in the vicinity of the welding electrode 4 is ionized and the arc is ignited. To ionize the gas or the gas path, depending on the distance between the welding electrode 4 and the workpiece 7, a high voltage in the range of 1 kV to 20 kV must be generated for HF ignition. Z It is generated in the form of an HF voltage pulse, which typically has a very steep rising edge, typically with a rise time in the range of 100 ns. For safety reasons, the permissible HF ignition energy is limited, for example to a maximum of 4 J / s. Therefore, the total energy of the HF voltage pulses per second can be a maximum of 4 J.

[0027] After the ignition arc, the HF ignition voltage u is removed again Z , and the welding process begins. Such HF ignition and the possible configurations of such HF ignition are sufficiently known.

[0028] Due to the spatial proximity of the welding control circuit 12 (with the data line 20) and the electrode circuit 5, for example in the hose package 25 or in the welding torch 3, when the HF ignition voltage u Z When applied to electrode line 5, crosstalk between electrode line 5 and the lines of welding control line 12 can occur (inductively or capacitively, or also via spark paths or creepage paths), causing HF ignition energy to escape and leaving little HF ignition energy available for igniting the arc. It has been shown that the shielding of shielded data lines 20 in welding control line 12, such as shielded data cables for data communication, in particular, forms a particularly good HF leakage path. Furthermore, electrically conductive materials, such as cable lines or ground lines, that run parallel to data lines 20 over certain distances can also form good HF leakage paths.

[0029] However, an HF leakage path can also be formed through the welding wire 16. To ignite the arc, the ignition spark should jump from the welding electrode 4 to the workpiece 7. However, it may happen that a spark path is formed between the welding electrode 4 and the welding wire 16. Z The high voltage and also due to the steep edge of the voltage pulse, the HF ignition voltage u ZCrosstalk (inductive or capacitive) can also occur in the wire control line 18. The shielding of the shielded data line 20 in the wire control line 18, for example a shielded data cable for data communication, also forms a particularly good HF leakage path. As a result, HF ignition energy can also escape through the welding wire 16 and the wire control line 18.

[0030] Due to the HF voltage, the HF ignition voltage u Z The induced HF current can flow through the HF leakage path. Of course, the HF current and HF voltage also depend on the type of HF leakage path. The HF voltage can be Z of the order of magnitude, ie in the high voltage range and in some cases can even correspond to the HF ignition voltage u Z .

[0031] After the HF ignition energy cannot be increased arbitrarily, such a discharge of HF ignition energy via the welding control line 12 and / or the welding wire control line 18 or via the data line 20 arranged therein should be avoided or at least minimized. To achieve this, a decoupling device 35 for possible HF voltages is provided on the data line 20, as will be described below with reference to Figure 2 Just as described.

[0032] For example, the data line 20 in the welding wire control line 18 or welding control line 12 is galvanically separated into a first data line section 20a and a second data line section 20b using an HF decoupling device 35. Any shielding of the data line 20 is also galvanically separated. The first data line section 20a is connected to a first coupling element 21a, and the second data line section 20b is connected to a second coupling element 21b. The coupling elements 21a and 21b are interconnected in the HF decoupling device 35 via a non-galvanic coupling section 23. The coupling elements 21a and 21b convert the electrical signal D on the data line 20 into a wirelessly transmittable transmit signal K, which is transmitted from a wireless transmitter S to a wireless receiver E via a wireless coupling section 23. For bidirectional transmission, a transmitter S and a receiver E can be provided in each of the two coupling elements 21a and 21b. In principle, it is also possible for a single line to operate bidirectionally and have a transmitter S and / or a receiver E at each end. "Wireless" is understood here to mean transmission without electrical conductors as a transmission path between the transmitter S and the receiver E, i.e., an electrically isolated transmission path. The wireless coupling path 23 can be, for example, air, a vacuum, a non-conductive fluid, or an optical waveguide, but in no case an electrical conductor. The wirelessly transmittable transmission signal K can be, for example, in the form of electromagnetic waves (light), sound waves (for acoustic transmission), or alternating magnetic fields (for inductive transmission), as long as the air path and creepage path requirements are met.

[0033] In the decoupling device 35, each coupling element 21a, 21b has its own current supply 22a, 22b, in which a conversion unit is implemented to convert the electrical signal D on the data line 20 into a wirelessly transmittable transmission signal K. The conversion unit in the coupling elements 21a, 21b can be designed as a converter unit, a data converter, a transmission unit (transceiver unit), a transmitter (transceiver) or a signal converter. There is no current supply for the HF ignition voltage u between the current supplies 22a, 22b. Z An outgoing electrical path can be ensured, for example, by a corresponding design or configuration.

[0034] exist Figure 3 A possible embodiment of a coupling link 21 with a conversion unit is presented in FIG. The electrical signal D on the data line 20 is converted in a suitable manner in a digital / digital converter 24 and transmitted wirelessly as a transmission signal K by the transmitter S. The coupling section 23 is implemented as an optical waveguide in this embodiment. Conversely, the transmission signal K obtained wirelessly via the receiver E can be converted into the electrical signal D of the data line 20 using the digital / digital converter 24. Obviously, the digital / digital converter 24 is adapted to the data communication protocol of the data line 20 and the type of wireless transmission on the coupling section 23 as well as the transmitter S and the receiver E. A voltage converter 25 can also be provided, for example as in Figure 3 , in order to adapt the supply voltage of the power supply 22 to the requirements of the coupling element 21. A person skilled in the art can adapt the coupling element 21 accordingly to the respective application without further implementation.

[0035] The individual components of the coupling element 21 are usually implemented as electronic devices. For this purpose, the electronic circuit is usually arranged on a printed circuit board, on which the components of the electronic circuit are closely attached to each other. It must be noted that the HF ignition voltage u Z is designed to extend over an ignition path of several centimeters. Therefore, the HF voltage on the data line 20 or its shield (which can be the HF ignition voltage u Z of the order of magnitude) can be easily transmitted in such electronic circuits with small distances between lines and components, for example by inductive or capacitive crosstalk or by the formation of spark paths or creepage paths. This is also why the current supply 22a, 22b for the HF voltage (see in particular Figure 2 ) are embodied as a decoupling from one another, since otherwise the HF voltage could be forwarded via the power supplies 22a, 22b.

[0036] By means of coupling elements 21a, 21b and wireless coupling section 23, an HF voltage applied to data line 20, for example, in the shield of the data line, is blocked and cannot be transmitted from first data line section 20a to second data line section 20b, or vice versa. Due to the separate current supplies 22a, 22b, no HF leakage paths can be formed via current supplies 22a, 22b, and no HF current can flow. As a result, the electrical signal D to be transmitted on data line 20 is not affected.

[0037] The advantageous design of the current supply parts 22a, 22b will be described in detail in the accompanying drawings. Figure 4 The embodiment of the coupling elements 21 a , 21 b is as described above, here with, for example, an optical waveguide as coupling section 23 .

[0038] In this case, in addition to the data line 20, a power supply line 26 is also arranged, via which electrical energy is supplied from the welding device 2 to specific components, for example to the wire feed unit 15 or the operating element 14 on the welding torch 3. For HF decoupling, a blocking choke 27 is arranged in a known manner in the power supply line 26. In order to construct the blocking choke 27, the core wire of the power supply line 26 is wound onto a ferrite core in a known manner. Additional wiring with inductance, capacitance and / or resistance can also be provided on the blocking choke 27, for example in order to adapt the attenuation. The blocking choke 27 prevents the transmission of HF voltages via the power supply line 26. The power supply line 26 on both sides of the blocking choke 27 is thus decoupled from HF. This can be used to supply electrical energy to the coupling elements 21a, 21b. Each of the two coupling elements 21a, 21b receives the required electrical energy from the power supply line 26 on one of the two sides of the blocking choke 27, thereby providing the HF ignition voltage u Z The power supplies 22a, 22b are designed to be decoupled from one another.

[0039] Furthermore, in certain embodiments of the data network, data line 20 a can be used to supply power to first digital / digital converter 24 , and data line 20 b can be used to supply power to second digital / digital converter 24 , wherein the two power supplies are each decoupled.

[0040] The current supply units 22a and 22b may also be Figure 6 As shown, it is implemented as a separate battery 28, or as Figure 5As shown, an additional battery 28 can be provided. Furthermore, provision can also be made for battery 28 to be easily replaceable. Commercially available rechargeable batteries, such as lithium-ion batteries, can also be used as battery 28. It is also conceivable that the rechargeable batteries of power supply units 22a, 22b can be charged separately via a suitable adapter, such as a USB adapter. It is also conceivable that, while maintaining galvanic separation, photovoltaic elements provide this energy. A photovoltaic element is understood to be any component that converts light directly into electrical current, such as a solar cell, for example, due to the photoelectric effect. It is also obvious to a person skilled in the art that a battery 28 with a larger charging capacity can be installed in a coupling element 21 that functions as a transmitter than in a coupling element 21 that functions purely as a receiver.

[0041] Furthermore, it is also possible to supply energy to the coupling elements 21a, 21b via optical technology, in particular laser technology, as the current supply 22, since this technology also results in perfect galvanic separation. Figure 7 For example, the light (e.g. laser) of the light source 31 (e.g. laser) can be focused onto the photovoltaic element 32 via an optical waveguide 33. The light source 31 can be supplied by a power supply line 26 (e.g. Figure 7 ) or the battery 28 can also supply the electrical energy. This power supply line 26 or the battery 28 can also serve as the current supply part 22a of the first coupling element 21a. The photovoltaic element 32 serves as the current supply part 22b of the second coupling element 21b. However, the photovoltaic element 32 can also charge the internal battery 28 (for example, as in Figure 5 (in Chinese). Figure 4 In this embodiment, the supply line 26 can also be led through the decoupling device 35 via the blocking inductor 27 .

[0042] When the power supply line 26 or the photovoltaic element 32 is used to supply the voltage to the coupling element 21, a battery 28 may be additionally provided, such as in Figure 5 When the power supply line 26 is not powered, the battery 28 (which can also be charged by the power supply line 26) is used. Figure 5 As shown by the dashed line in FIG, data communication via the data line 20 can also be maintained.

[0043] The coupling elements 21a, 21b and, if necessary, the power supply 22a, 22b of the decoupling device 35 and the optional battery 28 are preferably arranged in a decoupling box 30 in a common housing. This makes it possible to provide the HF decoupling of the data line 20 according to the invention at any arbitrary point in the welding assembly. A corresponding connection socket can be provided on the decoupling box 30 to which the data line 20 and, if necessary, also other lines, such as the power supply line 26, can be connected. Figure 1 In the welding assembly 1, the decoupling box 30 can be arranged, for example, in front of the control line socket 13 on the welding device 2, or in the wire control line 18 between the welding device 2 and the wire feeding unit 15. Of course, as needed, the decoupling box 30 can also be arranged at multiple locations of the welding assembly 1, for example, at the two mentioned locations.

[0044] Of course, the decoupling device 35 according to the invention can also be used in welding assemblies 1 in which no HF ignition is provided or used.

[0045] Likewise, a decoupling device 35 for a possible HF voltage on data line 20 can also be provided in other arrangements with a device and other components of the assembly. Data line 20 is provided between the device and the other components, and data communication between the device and the other components occurs via data line 20. For example, the assembly can be a photovoltaic system with a control unit as a device and a photovoltaic inverter as a further component for feeding electrical energy into a power grid, or a photovoltaic system with a photovoltaic inverter as a device for feeding electrical energy into a power grid and photovoltaic modules as further components. The assembly can also be a battery charging system with a charging device as a device and a battery or a battery management unit as a further component.

Claims

1. A welding assembly comprising a welding device (2) and a welding component connected to the welding device (2), and comprising an HF ignition unit (17) for generating an HF ignition voltage (u Z ) for HF ignition of an arc for welding, wherein A data line (20) is provided between a welding device (2) and a welding component, and data communication between the welding device (2) and the welding component is realized via the data line (20), characterized in that a decoupling device (35) is provided, in which a first data line section (20a) of the data line (20) is connected to a first coupling link (21a), and a second data line section (20b) of the data line (20) is connected to a second coupling link (21b), and the first coupling link (21a) and the second coupling link (21b) are connected to each other via a wireless coupling section (23) for galvanically isolating the data line (20), and a separate current supply (22a, 22b) is provided for each of the first coupling link (21a) and the second coupling link (21b), and the current supply (22a, 22b) of the first coupling link (21a) and the second coupling link (21b) are designed to be energized by an HF ignition voltage (u Z ) are decoupled from one another by the HF voltages on the data line (20).

2. The welding assembly according to claim 1, characterized in that The power supply (22a, 22b) of the first coupling element (21a) and / or the second coupling element (21b) is embodied as a battery (28).

3. The welding assembly according to claim 1, characterized in that A supply line (26) for conducting a supply voltage is provided in the welding assembly, wherein a blocking choke (27) is arranged in the supply line (26), the blocking choke being designed to decouple both sides of the blocking choke (27) for a given HF voltage on the supply line (26), and a current supply part (22a) of a first coupling element (21a) taps off the supply voltage on one side of the blocking choke (27).

4. The welding assembly according to claim 3, characterized in that The power supply (22b) of the second coupling element (21b) taps off the supply voltage on the other side of the blocking inductor (27).

5. The welding assembly according to claim 1, wherein: The current supply parts (22a, 22b) of the first coupling element (21a) and / or the second coupling element (21b) are implemented as photovoltaic elements (32), and a light source (31) is provided, which applies light to the photovoltaic elements (32).

6. The welding assembly according to claim 5, characterized in that A battery (28) is provided, which supplies electrical energy to the light source (31).

7. The welding assembly according to claim 5, characterized in that The light source (31) is supplied with electric energy by a current supply portion (22a) of a first coupling link (21a), and the photovoltaic element (32) is provided as a current supply portion (22b) of a second coupling link (21b).

8. The welding assembly according to claim 7, characterized in that A supply line (26) having a supply voltage is passed through a decoupling device (35), and the supply line (26) is provided as a current supply (22a) for a first coupling element (21a).

9. The welding assembly according to any one of claims 1 to 8, characterized in that The decoupling device (35) is embodied as a separate unit in the form of a decoupling box (30).

10. A method for decoupling a data line (20) from an HF voltage present on the data line (20), wherein: Data (D) is exchanged between the welding device (2) and a welding component connected to the welding device (2) via a data line (20), and an HF ignition voltage (u Z ), the HF ignition voltage is used for HF ignition of an arc for welding with a welding device (2), wherein the HF ignition voltage (u Z ) generates an HF voltage on a data line (20), characterized in that the data line (20) is galvanically separated into a first data line section (20a) and a second data line section (20b), and the first data line section (20a) is connected to a first coupling link (21a), and the second data line section (20b) is connected to a second coupling link (21b), and the first coupling link (21a) and the second coupling link (21b) are connected to each other via a wireless coupling section (23), and the first coupling link (21a) and the second coupling link (21b) are respectively supplied with power by their own current supply units (22a, 22b), and the current supply units (22a, 22b) of the first coupling link (21a) and the second coupling link (21b) are decoupled from each other with respect to the HF voltage on the data line (20).

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