Welding installation having a welding device and a welding element connected to the welding device

Abstract

In order to reduce the emission of high-frequency ignition energy via the data line 20 for transmitting data between the welding device 2 and other components of the welding installation 1, an electrical isolation device 35 is provided, in which it is proposed that the first data line section 20a of the data line 20 is connected to a first coupling element 21a and the second data line section 20b of the data line 20 is connected to a second coupling element 21b. In this case, the first coupling element 21a and the second coupling element 21b are connected to each other via a wireless coupling section 23 in order to electrically isolate the data line 20. In this case, a respective unique power supply 22a, 22b is provided for the first coupling element 21a and the second coupling element 21b, and the power supply 22a of the first coupling element 21a and the power supply 22b of the second coupling element 21b are connected to each other via a wireless coupling section 23 in order to electrically isolate the data line 20. In this case, a respective unique power supply 22a, 22b is provided for each of the first coupling element 21a and the second coupling element 21b, and the power supply 22a of the first coupling element 21a and the power supply 22b of the second coupling element 21b are connected to each other via a wireless coupling section 23 in order to electrically isolate the data line 20. Z The data lines 20 are electrically insulated from each other to prevent a high frequency voltage on the data lines 20 due to the above.

Description

[Technical field]

[0001] The present invention relates to a welding installation having a welding device, a welding component connected to the welding device, and a radio frequency ignition unit for generating a radio frequency ignition voltage for radio frequency ignition of an arc for welding, wherein a data line is provided between the welding device and the welding component, and data communication between the welding device and the welding component is performed via the data line, and the present invention relates to an electrical isolation device for providing a radio frequency voltage on the data line. [Background technology]

[0002] Various methods of arc fusion welding are known, such as, for example, MIG (Metal Inert Gas) welding, MAG (Metal Active Gas) welding, WIG (Tungsten Inert Gas) welding, MMA (Manual Metal Arc) welding, WAAM (Wire Arc Additive Manufacturing) welding or plasma welding. In the case of MIG, MAG, MMA and WAAM welding, a molten electrode is used which is simultaneously used as filler metal. In the case of WAG and plasma welding, a non-molten electrode is used, and the filler metal is separately supplied to the arc during welding as required. Similarly, various methods are known for igniting the arc to start welding. Mainly, there is the contact ignition method. In the case of the contact ignition method, for ignition, a welding electrode is brought into contact with the workpiece to be welded, and when the welding electrode is removed from the workpiece after the contact, an arc is ignited by a current passed through the welding electrode. In the case of non-contact ignition, the welding electrode is kept at a distance from the workpiece to be welded and a high voltage of high frequency is applied to the welding electrode in order to ignite a stable arc by the cascading effect that occurs as a result of ionizing and making conductive the shielding gas space between the welding electrode and the surface of the workpiece. In the case of high frequency ignition, a high voltage transformer is generally used. The secondary side of this high voltage transformer is arranged, for example, on a welding cable connected to the welding electrode or in parallel between two welding cables in order to input a high frequency ignition voltage (generally in the range of 1 kV to 20 kV) to a welding cable or between two welding cables in parallel. Various welding methods and various ignition methods are available for manual and robotic welding.

[0003] In order to ensure a high-frequency ignition that is as stable as possible, it is advantageous that the high-frequency arc energy for the generation of a high-frequency arc between the welding electrode and the workpiece is used to ignite the arc and that the high-frequency arc energy is not conducted in whole or in part via other undesired conductive paths and / or paths that are not normally conductive as leakage currents and / or leakage currents. Due to the very high high-frequency ignition voltage, paths that are non-conductive per se can also become conductive and leakage currents or leakage currents can occur. Paths through which leakage currents or leakage currents can occur are therefore generally referred to as electrical leakage paths. To take into account losses that may occur through electrical leakage paths, the amount of permissible high-frequency ignition energy is limited for safety reasons by standards such as, for example, EN60974-3 for arc igniters and stabilizing devices. As a result, the ignition energy cannot be increased arbitrarily. It is therefore important to reduce or eliminate the release of high-frequency ignition energy through electrical leakage paths. For this reason, it is already known, as described, for example, in EP 1 704 012, to arrange a choke coil between the power supply of the welding device and a high-frequency generator for generating the high-frequency ignition voltage, in order to transfer the high-frequency ignition energy entirely to the welding electrode and to avoid the emission of the high-frequency ignition energy via the welding cable to the welding device. However, such a choke coil can only be used advantageously with an electric cable carrying a low-frequency useful signal, since otherwise the high-frequency useful signal would also be unintentionally attenuated or completely blocked. Such a low-frequency useful signal can be transmitted, for example, by the welding cable (welding current) or by a power supply line.

[0004] In modern welding torches, electronic devices are also often used, to which the supply voltage is supplied from the welding device via a power supply line. The electronic devices in the welding torch are used, for example, to control the welding process. In order to control the welding process, for example by setting or adjusting the welding parameters, operating elements for the welder, for example keys, buttons, control knobs, etc., which can be operated by the welder, can be arranged on the welding torch. Also, display elements, such as displays, luminaires, etc., can be provided on the welding torch in order to display information about the welding or the welding process to the welder. Furthermore, measuring elements, for example for measuring the arc voltage or the welding current, can be provided in the welding torch or in the control knob. In this case, the measured values ​​detected by the measuring elements are transmitted to the welding device via a data line. The arc voltage is required, for example, for actively controlling the feed of the welding wire (melting electrode or separate filler metal). In order to measure the arc voltage in the welding device, a measuring cable can be laid from the welding torch to the welding device. In this case, such a measuring cable for the purposes of the present invention can also be considered as a data line. Thus, via said data line, analog or digital data or signals can be transmitted from operating or display elements or also from other parts of the welding installation.

[0005] For data lines, special data lines with electrical shielding, in particular with twisted wires, must be used around the welding device, especially if high data transmission rates of 1 Mbit / s to several Gbit / s and stable data transmission are required. This is because the welding current can have a high rate of change (e.g. steep welding current edges), which can cause electromagnetic interference or electromagnetic inductive coupling on the data line. However, the electrical shielding of the data line, which is generally grounded, is an ideal electrical leakage path, since the high-frequency ignition voltage can be capacitively coupled into the shielding of the data line, for example in a hose packet. If data lines are used without shielding, high-frequency coupling can occur in the cores of the data line. This can also lead to the high-frequency ignition energy being released from the welding electrode and interference can occur during data communication. The use of choke coils is already known for measuring cables, for example from EP 1 021 269 B1. In this case, for high-frequency ignition, a choke coil of the measuring cable is wound on the secondary side of the high-voltage transformer. The choke coil reduces the high-frequency alternating current. This can certainly reduce the emission of high-frequency ignition energy, but at the same time, due to the low-pass effect of the choke coil, the possible transmission of information via the measuring cable is also limited, for example by attenuation or by limiting the frequency range of the measurement signal. However, in order to reduce the emission of ignition energy by the data line, it is possible to wind a choke coil around the shielded or unshielded data line. However, if a choke coil is present on the data line, high-frequency energy is also lost due to the inevitable high-frequency magnetization of the choke coil.

[0006] Another problem with shielded data lines is that due to the shielding and structure of the data lines, the radius of curvature of the data lines must not be less than a certain value based on the manufacturer's specifications in order not to destroy and damage the shielding. However, as a result, winding the shielded data lines around an iron core increases the size of the choke coil. The large size of the choke coil makes it cumbersome, expensive, and unsuitable for use in many cases. Thus, while the choke coil does indeed function in principle in shielded data lines for transmitting data where the useful signal is generated at a higher frequency, the choke coil becomes very quickly bulky, expensive, and heavy due to the minimum radius of curvature of the shielded data lines.

[0007] Therefore, using a choke coil for one data line (or for multiple data lines) is not very beneficial for a number of reasons. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] European Patent No. 1704012 [Patent Document 2] European Patent No. 1021269 Summary of the Invention [Problem to be solved by the invention]

[0009] SUMMARY OF THE DISCLOSURE It is therefore an object of the present invention to reduce the emission of high-frequency ignition energy via data lines for transmitting data between a welding device and other components of a welding installation. [Means for solving the problem]

[0010] This problem is solved by the features of the independent claims.

[0011] Due to the electrical insulation of the data line with the electrical insulation of the possible shield of the data line, no high frequency leakage current path is formed which may be generated by the data line, and the emission of high frequency ignition energy can be avoided. In order to prevent the formation of a leakage current path by the power supply of the coupling element, it is proposed that the power is supplied to the coupling element from separate power supplies which are configured to be electrically isolated from each other for the high frequency voltages generated on the data line. In this way, high frequency ignition energy cannot be emitted by the power supplies either. Thus, strong high frequency insulation on the data line can be realized without choke coils in the data line.

[0012] Preferably, the power supply of the first coupling element and / or the power supply of the second coupling element are configured as batteries. Separate batteries can be configured with simple electrical insulation for high frequency voltages, for example by sufficiently spatially separating the electrodes of the batteries, to prevent the formation of discharge paths.

[0013] In a particularly preferred arrangement, a feed line providing a supply voltage is used to feed the coupling element. To this end, a choke coil is arranged on the feed line, the choke coil being configured to separate both sides of the choke coil for high frequency voltages occurring on the feed line. A feed part of the first coupling element receives the supply voltage on one side of the choke coil. Preferably, a feed part of the second coupling element receives the supply voltage on the other side of the choke coil.

[0014] In an equally preferred configuration, optical technology is used to electrically isolate the power supplies. For this purpose, the power supply of the first coupling element and / or the power supply of the second coupling element are configured as photovoltaic modules and a light source is provided for irradiating the photovoltaic modules with light. In this case, it is advantageous that power is supplied to the light source from the power supply of the first coupling element and the photovoltaic module is provided as the power supply of the second coupling element. It can thus be achieved that the power supplies are electrically isolated via an optical path provided for high-frequency voltages.

[0015] The present invention will now be described in detail with reference to the exemplary, schematic and non-limiting figures of Figures 1 to 7 which show preferred configurations of the present invention. [Brief description of the drawings]

[0016] [Figure 1] 1 shows a welding installation having a high frequency ignition unit and having a data line for data communication between the welding device and a welding component connected to the welding device via the data line. [Diagram 2] 1 illustrates an electrical isolation device of the present invention. [Diagram 3] 1 shows the configuration of a coupling element. [Figure 4] 1 shows an electrical isolation device of the present invention which performs power supply via a power supply line. [Diagram 5] 1 shows a configuration of a coupling element with a battery. [Figure 6] 1 shows a configuration of a coupling element with a battery. [Figure 7] 1 shows high frequency electrical isolation with power provided through the optical path. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] In FIG. 1, a welding installation 1 for WIG welding is shown exemplarily and diagrammatically. A welding electrode 4 at a welding torch 3 is connected to the welding device 2 via an electrode cable 5. In this case, a welding electrode of the non-melting electrode type is connected to the welding device 2, for example via an electrode power connector 8. A workpiece 7 to be welded is connected to the welding device 2 via a ground cable 6, for example via a ground power connector 9. During welding, an arc is generated between the welding electrode 4 and the workpiece 7, and a welding current generated by a power supply 10 in the welding device 2 is passed through it. A welding control 11 is provided in the welding device 2, which controls and monitors the welding process. A user interface (not shown) may also be provided in the welding device 2, via which a user can select, set or change the welding parameters of the welding process. The welding torch 3 is connected to the welding device 2 via a welding control cable 12, for example via a control connector 13. Operating elements 14 at the welding torch 3, for example keys, displays, control knobs, etc., can be connected to the welding control 11 via the welding control cable 12. This allows a unidirectional or bidirectional exchange of data between the welding device 2 and the welding torch 3. Similarly, welding parameters of a welding process can be selected, set or changed via such operating elements 14 on the welding torch 3 and / or the set welding parameters can be displayed.

[0018] Typically, the electrode cable 5 and the welding control cable 12 are arranged in a common hose packet 25. Further piping, such as piping for shielding gas, refrigerant piping for torch cooling, welding wire feed piping, etc. may be arranged in such a hose packet 25 in a well known manner.

[0019] In the embodiment shown in Fig. 1, a welding wire feeder 15 is also provided for feeding a welding wire 16 to a welding position. The welding wire feeder 15 can be integrated into the welding apparatus 2, but can also be configured as a separate device. The welding wire feeder 15 can be controlled by the welding control 11 via a wire control cable 18 to perform the welding process. In particular in the case of an external welding wire feeder 15, the wire control cable 18 can be plugged into a wire control cable connector 29, which can also be connected to the welding control 11 at the welding apparatus 2. In another welding installation, the welding wire can be laid in a hose packet 25 and can function as a fusible welding electrode.

[0020] The welding control cable 12 may comprise various cables. For example, a power supply cable may be provided (also in a multi-pole manner) for supplying power to the operating element 14 at the welding torch 3. For transmitting data between the welding device 2 and the welding torch 3, a data line 20 (not shown in FIG. 1 ) may be provided in the welding control cable 12. A data communication bus may be implemented over this data line 20. Data may be transmitted via this data communication bus by means of a predefined communication protocol. For example, a measurement cable or a signal cable may be provided as a data line, for example for detecting the potential of the welding electrode 4 or for transmitting an analog signal.

[0021] Similarly, the wire control cable 18 may include various cables. A power supply cable may be provided (even multi-pole) for supplying power to the welding wire feeder 15 by the welding device 2. The wire control cable 18 may also include a data line 20 (not shown in FIG. 1 ). A data communication bus may be implemented over this data line 20. Data may be transmitted unidirectionally or bidirectionally via this data communication bus according to a pre-set communication protocol for open-loop and / or closed-loop control of the welding wire feed.

[0022] In order to ignite (ignition also means re-ignition) the arc for welding, a high-frequency voltage source 19 can be provided in the high-frequency ignition unit 17 in addition to an optionally present (not shown) off-load voltage step-up and an optionally present (not shown) auxiliary power supply. The high-frequency ignition unit 17 receives a voltage amplitude u Z High frequency ignition voltage u Z , which is generally generated as an ignition voltage impulse. In the embodiment according to FIG. 1, a high-frequency voltage source 19 is provided. The output voltage of this high-frequency voltage source 19 is converted by a high-frequency transformer into a high-frequency ignition voltage u Z In this embodiment, the secondary winding of the high frequency transformer is disposed in the cable between the power supply unit 10 and the electrode power connector 8, and the high frequency ignition voltage u Z is input to the electrode cable 5. However, the high frequency ignition voltage u Z may be applied between the electrode cable 5 and the ground cable 6. The high frequency ignition unit 17 does not necessarily have to be disposed within the welding device 2, but may be disposed outside the welding device 2 or within the welding wire feeder 15 as a separate device.

[0023] High frequency ignition voltage u Z The gas is ionized around the welding electrode 4 and an arc is ignited by means of the ionization voltage u. In order to ionize the gas or to ionize the gas section, a high voltage in the range of 1 kV to 20 kV, as is known, must be generated for the high frequency ignition, depending on the existing distance between the welding electrode 4 and the workpiece 7. For the ignition, the high frequency ignition voltage u Z is generated as a high-frequency voltage impulse with very steeply rising edges with rise times typically in the range of 100 ns. For safety reasons, the permitted high-frequency ignition energy is limited, for example, by a maximum of 4 J / s. The total energy of the high-frequency voltage impulse per second is therefore a maximum of 4 J.

[0024] After the arc is ignited, the high frequency ignition voltage u ZThe current is then extinguished and the welding process begins. Such high frequency ignition and possible embodiments of such high frequency ignition are well known.

[0025] Since the welding control cable 12 (with the data line 20) and the electrode cable 5 are in close spatial proximity, for example in the hose packet 25 or in the welding torch 3, the high-frequency ignition voltage u Z When a high frequency current is applied to the electrode cable 5, crosstalk occurs (inductively or capacitively, or across a discharge path or leakage current path) between the electrode cable 5 and the lines of the welding control cable 12. This causes the high frequency ignition energy to be released and reduces the high frequency ignition energy for igniting the arc. In particular, it has been found that the shield of the shielded data line 20 in the welding control cable 12, e.g. a shielded data line for data communication, forms a very significant high frequency leakage current path. Furthermore, a conductive material, e.g. a cable line or a ground cable, running parallel to the data line 20 over a certain path also forms a significant high frequency leakage current path.

[0026] However, a high frequency leakage current path may also occur across the welding wire 16. In order to ignite an arc, an ignition arc must be generated from the welding electrode 4 towards the workpiece 7. However, it may happen that a discharge path occurs between the welding electrode 4 and the welding wire 16. The high frequency ignition voltage u Z Due to the high voltage of , and also due to the steeply rising voltage impulse, the high frequency ignition voltage u Z However, the welding wire 16 may also crosstalk (inductively and capacitively) towards the wire control cable 18. Again, the shielding of the shielded data lines 20 in the wire control cable 18, e.g., shielded data lines for data communication, forms a very significant high-frequency leakage current path. Thus, high-frequency ignition energy may also be emitted by the welding wire 16 and the wire control cable 18.

[0027] The fact that a high-frequency current can flow through the high-frequency leakage current path due to the high-frequency voltage is called the high-frequency ignition voltage uZ Naturally, the high frequency current and the high frequency voltage also depend on the type of the high frequency leakage current path. The high frequency voltage is the high frequency ignition voltage u z , i.e., may be in the range of the high frequency voltage in question, and in certain cases may even be the high frequency ignition voltage u Z can match.

[0028] If the high-frequency ignition energy cannot be increased as desired, then such a release of said high-frequency ignition energy must be avoided or at least significantly reduced via the welding cable 12 and / or the wire control cable 18 or the data line 20 arranged in the wire control cable 18. In order to achieve the avoidance or significant reduction of the release of said high-frequency ignition energy, an electrical isolation device 35 is provided for high-frequency voltages that may occur on the data line 20, as will be explained below with reference to FIG.

[0029] A data line 20, for example in a wire control cable 18 or a welding control cable 12, is electrically isolated by a high-frequency electrical isolation device 35 into a first data line section 20a and a second data line section 20b. In this case, a possible shield of the data line 20 is also electrically isolated. 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 connected to one another via an electrical isolation section 23 in the high-frequency electrical isolation device 35. The coupling elements 21a, 21b convert an electrical signal D on the data line 20 into a wirelessly transmittable transmission signal K, which is transmitted from a wireless transmitter S via the wireless coupling section 23 to a wireless receiver E. For a bidirectional transmission, a transmitter S and a receiver E can be provided for each of the two coupling elements 21a, 21b, respectively. In principle, it is also possible that individual cables can be operated bidirectionally and have a transmitter S and / or a receiver E at both ends, respectively. Here, "wireless" means a transmission without a conductor as the transmission section between the sender S and the receiver E, i.e. a transmission with an electrically insulating transmission section. The wireless coupling section 23 may be, for example, air, a vacuum, a non-conductive liquid or an optical cable, but in any case is not a conductor. As long as air gaps and leakage current paths can be maintained, the wirelessly transmittable transmission signal K can exist, for example, as electromagnetic waves (light) or as sound waves (for acoustic transmission) or as an alternating magnetic field (electromagnetic inductive transmission).

[0030] Each coupling element 21a, 21b has its own power supply 22a, 22b mounted in an electrical isolation device 35 for a converter for converting the electrical signal D on the data line 20 into a wirelessly transmittable transmission signal K. The converter in the coupling element 21a, 21b can be configured as a converter, a data converter, a radio transmitter, a transceiver or a signal converter. A high-frequency ignition voltage u is applied between the power supplies 22a and 22b. Z This can be ensured, for example, by a corresponding structure or construction.

[0031] A possible embodiment of the coupling element 21 with a converter is shown in Fig. 3. The electric signal D on the data line 20 is appropriately converted in a digital / digital converter 24 and transmitted wirelessly as a transmission signal K via a transmitter S. In this embodiment, the coupling section 23 is configured as an optical fiber. Conversely, a transmission signal received wirelessly via a receiver E can be converted by the digital / digital converter 24 into an electric signal D on the data line 20. It is clear that the digital / digital converter 24, like the transmitter S and the receiver E, is adapted to the data communication protocol of the data line 20 and to the manner of wireless transmission on the coupling section 23. In order to adapt the supply voltage of the power supply 22 to the requirements of the coupling element 21, a voltage converter 25, for example a DC / DC converter as shown in Fig. 3, can be provided. A person skilled in the art can thus appropriately adapt the coupling element 21 to the respective situation of use without further configuration.

[0032] In general, the individual components of the coupling element 21 can be configured as electronic elements. For this reason, the electronic circuit is typically arranged on a printed circuit board with several components of the electronic circuit in close proximity. To overcome the firing interval of several centimeters, the high frequency firing voltage u Z It should be noted that the high frequency ignition voltage u Z A high-frequency voltage on the data line 20 or on the shield of the data line 20, which may be as high as 100 kV, can easily be transmitted in such an electronic circuit with closely spaced wires and components, for example by inductive or capacitive crosstalk or by discharge or leakage current paths formed. This is also the reason why the power supply 22a and the power supply 22b (see in particular FIG. 2) are configured electrically isolated from each other for the high-frequency voltage, because otherwise the high-frequency voltage could be transmitted further via the power supply 22a and the power supply 22b.

[0033] A high-frequency voltage applied to the data line 20, for example a high-frequency voltage applied to the shield of the data line 20, is blocked by the coupling elements 21a, 21b and the wireless coupling section 23, and cannot be transmitted from the first data line section 20a to the second data line section 20b, or from the second data line section 20b to the first data line section 20a. Since the power supply section 22a and the power supply section 22b are separated, a high-frequency leakage current path cannot be formed through these power supply sections 22a, 22b, and high-frequency current cannot flow. As a result, the electrical signal D to be transmitted on the data line 20 is not adversely affected.

[0034] A preferred configuration of the feeds 22a, 22b will now be described with reference to figure 4, in which the configuration of the coupling elements 21a, 21b comprises here, for example as coupling section 23, an optical fibre, as described above.

[0035] In this case, in addition to the data line 20, a power supply line 26 is also arranged. Power is supplied from the welding device 2 to a certain component, for example the welding wire feeder 15 or the operating element 14 at the welding torch 3, via the power supply line 26. To filter out high-frequency waves, a choke coil 27 is arranged in the power supply line 26 in a known manner. To form the choke coil 27, the core of the power supply line 26 is wound on a ferrite core in a known manner. Further wiring with inductance, capacitance and / or resistance may also be provided in the choke coil 27, for example to adapt the attenuation. The choke coil 27 prevents high-frequency voltages from being transmitted via the power supply line 26. Thus, high-frequency waves are filtered out in the power supply line 26 on both sides of the choke coil 27. This can be used to supply power to the coupling elements 21a, 21b. Each of the two coupling elements 21a, 21b receives the required power from the power supply line 26 on one of the two sides of the choke coil 27. This results in a high-frequency ignition voltage u Z These power supply sections 22a, 22b for the respective power supply units are constructed separately from each other.

[0036] Furthermore, in a particular embodiment of the data network, the data line 20a can be used to power the first digital-to-digital converter 24 and the data line 20b can be used to power the second digital-to-digital converter 24, in which case both power supplies are suitably carried out separately.

[0037] The power supplies 22a, 22b may be constructed as separate batteries 28 as in FIG. 6 or an additional battery 28 may be provided as in FIG. 5. It may further be proposed that the battery 28 may be replaced by simple means. Commercially available rechargeable accumulators, such as lithium-ion cells, may also be used as the battery 28. It is also conceivable to charge the rechargeable cells of the power supplies 22a, 22b separately, each via a suitable adapter, such as a USB adapter. In this case, it is also conceivable that a photovoltaic module supplies the power, while maintaining electrical isolation. As the photovoltaic module, various elements, for example photovoltaic elements, which directly convert light into an electric current due to the photoelectric effect, are conceivable. It is also conceivable by those skilled in the art to incorporate a battery 28 having a charging capacity greater than the charging capacity of the battery in the coupling element 21 acting purely as a receiver, into the coupling element 21 acting as a transmitter.

[0038] Furthermore, a power supply to the coupling elements 21a, 21b by optical technology, in particular laser technology, is also possible as a power supply 22, since this technology likewise involves complete electrical insulation. An embodiment of such an electrode supply is illustrated in FIG. 7. For example, here light, for example laser light, can be focused from a light source 31, for example a laser, for example via an optical fiber 32 onto a photovoltaic module 32. Power can be supplied from a power supply 26 (as in FIG. 7) or from a battery 28. This power supply 26 or the battery 28 can also be used as the power supply 22a of the first coupling element 21a. The photovoltaic module 32 is used as the power supply 22b for the second coupling element 21b. However, the photovoltaic module 32 can also charge an internal battery 28 (for example as in FIG. 5). As in FIG. 4, the power supply 26 can be laid through an electrical isolator 35 via a choke coil 27.

[0039] When using the power supply line 26 or the photovoltaic module 32 to supply voltage to the coupling element 21, a battery 28 may further be provided, as shown in Fig. 5. Even when the power supply line 26 is de-energized, data communication via the data line 20 may be maintained by the battery 28, which may optionally also be charged via the power supply line 26 (as shown by a dashed line in Fig. 5).

[0040] The coupling elements 21a, 21b of the electrical isolating device 35, if necessary the power supplies 22a, 22b and the optional battery 28 are arranged in a common housing, in particular in an electrical isolating box 30. This makes it possible to provide the high-frequency electrical insulation of the data line 20 according to the invention at any arbitrary point of the welding installation. For connecting the data line 20 and further wiring, such as the power supply 26, to corresponding connectors, said corresponding connectors can be provided in the electrical isolating box 30. In the welding installation according to FIG. 1, the electrical isolating box 30 can be arranged, for example, in front of the control cable connector 13 at the welding device 2 or at the wire control cable 18 between the welding device 2 and the welding wire feeder 15. Naturally, the electrical isolating box 30 can also be arranged at several points of the welding installation 1 if necessary, for example at the two points mentioned above.

[0041] Naturally, the electrical isolation device 35 of the invention can also be used in welding installations 1 in which high frequency ignition is not performed or used.

[0042] Similarly, the electrical isolation device 35 for providing against high-frequency voltages that may occur on the data line 20 may also be provided in another installation having an equipment of the other installation and another component. The data line 20 is provided between the equipment and the other component, and data communication between the equipment and the other component is performed via the data line 20. For example, the installation may be a photovoltaic system having a control device as an equipment and a photovoltaic inverter for supplying power to the power grid as a separate component, or a photovoltaic system having a photovoltaic inverter for supplying power to the power grid as an equipment and a photovoltaic module as a separate component. The installation may be a battery charging system having a charging device as an equipment and a battery or a battery monitoring device as a separate component. The present application relates to the invention described in the claims, but may also include the following configurations as other aspects. 1. A welding device (2), welding components connected to the welding device (2), and a high-frequency ignition voltage (u) for high-frequency ignition of an arc for welding. Z A welding facility having a high frequency ignition unit (17) for generating a high frequency arc, In the welding equipment, a data line (20) is provided between the welding device (2) and the welding component, and data communication between the welding device (2) and the welding component is performed via the data line (20), An electrical isolation device (35) is provided, in which a first data line section (20a) of the data line (20) is connected to a first coupling element (21a) and a second data line section (20b) of the data line (20) is connected to a second coupling element (21b); The first coupling element (21a) and the second coupling element (21b) are connected to each other via a wireless coupling section (23) to electrically insulate the data line (20), and a unique power supply section (22a, 22b) is provided for each of the first coupling element (21a) and the second coupling element (21b), and the power supply section (22a) of the first coupling element (21a) and the power supply section (22b) of the second coupling element (21b) are connected to each other to supply the high-frequency ignition voltage (u Z The welding equipment is configured to be electrically insulated from each other in preparation for a high-frequency voltage on the data lines (20) caused by the high-frequency voltage on the data lines (20). 2. The welding equipment according to claim 1, wherein the power supply portion (22a) of the first coupling element (21a) and / or the power supply portion (22b) of the second coupling element (21b) are configured as a battery (28). 3. A power supply line (26) for supplying a supply voltage is provided in the welding equipment (1), a choke coil (27) is disposed on the power supply line (26), the choke coil (27) being configured to separate both sides of the choke coil (27) in order to provide for high frequency voltages occurring on the power supply line (26); and 2. The welding installation according to claim 1, wherein the power supply portion (22a) of the first coupling element (21a) receives the supply voltage on one side of the choke coil (27). 4. 4. The welding installation according to claim 3, wherein a power supply portion (22b) of the second coupling element (21b) receives the supply voltage on the other side of the choke coil (27). 5. the power supply portion (22a) of the first coupling element (21a) and / or the power supply portion (22b) of the second coupling element (21b) are configured as a photovoltaic cell module (32); and 2. The welding facility according to claim 1, further comprising a light source (31) for irradiating the photovoltaic cell module (32) with light. 6. 6. The welding facility according to claim 5, further comprising a battery (28) for supplying power to the light source (31). 7. 6. The welding installation according to claim 5, wherein power is supplied to the light source (31) from a power supply (22a) of the first coupling element (21a), and the photovoltaic cell module (32) is provided as a power supply (22b) of the second coupling element (21b). 8. 8. The welding equipment according to claim 7, wherein a power supply line (26) having a supply voltage is laid through the electrical insulation device (35), and the power supply line (26) is provided as a power supply portion (22a) of the first coupling element (21a). 9. 9. The welding facility according to any one of 1 to 8 above, wherein the electrical insulation device (35) is configured as an independent unit in the form of an electrical insulation box (30). 10. A method for electrically isolating a data line (20) from high frequency voltages on the data line (20), comprising: Data (D) is exchanged between the welding device (2) and the welding components connected to the welding device (2) via the data line (20), and a high-frequency ignition voltage (u) is generated for high-frequency ignition of an arc for welding by the welding device (2). Z ) is generated by the high frequency ignition unit (17), The high frequency ignition voltage (u Z ) in the method for generating a high frequency voltage on the data line (20), the data line (20) is electrically insulated into a first data line section (20a) and a second data line section (20b), 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 first coupling element (21a) and the second coupling element (21b) are connected to each other via a wireless coupling section (23); and The method, wherein the first coupling element (21a) and the second coupling element (21b) are each powered by their own power supply portion (22a, 22b), and the power supply portion (22a) of the first coupling element (21a) and the power supply portion (22b) of the second coupling element (21b) are electrically isolated from each other in preparation for a high frequency voltage on the data line (20). [Explanation of symbols]

[0043] 1. Welding equipment 2. Welding equipment 3. Welding torch 4. Welding electrodes 5 Electrode Cable 6 Ground Cable 7 Work 8 Electrode Power Connector 9 Ground Power Connector 10 Power supply section 11 Welding control unit 12 Welding control cable 13 Control Cable Connector 14 Operational elements 15 Welding wire feeder 16 Welding Wire 17 High frequency ignition unit 18 Wire Control Cable 19 Voltage Source 20 Data Line 20a First data line section 20b Second data line section 21 Bonding Elements 21a 1st connecting element 21b 2nd connecting element 22 Power supply unit, power supply 22a Power supply unit, power supply 22b Power supply unit, power supply 23 Electrically insulated section, wirelessly coupled section 24 Digital to Digital Converter 25 Voltage converter, hose packet 26 Power line 27 Choke coil 28 Battery, Internal Battery 29 Wire Control Cable Connector 30 Electrical insulation box 31 Light source 32 Photovoltaic Module 33 Optical Fiber 35 High-frequency electrical isolation device D. Electrical Signal K Radio transmittable transmission signal S wireless transmitter E Radio receiver

Claims

1. A welding device (2), welding components connected to the welding device (2), and a high-frequency ignition voltage (u) to be input to a welding cable for high-frequency ignition of an arc for welding. Ｚ A welding facility having a high frequency ignition unit (17) for generating a high frequency ignition current, In the welding installation, a data line (20) is further provided between the welding device (2) and the welding component, and data communication between the welding device (2) and the welding component is performed via the data line (20), An electrical isolation device (35) is provided, in which a first data line section (20a) of the data line (20) is connected to a first coupling element (21a) and a second data line section (20b) of the data line (20) is connected to a second coupling element (21b); The first coupling element (21a) and the second coupling element (21b) are connected to each other via a wireless coupling section (23) for electrically insulating the data line (20), and a separate power supply section (22a, 22b) is provided for each of the first coupling element (21a) and the second coupling element (21b), and the power supply section (22a) of the first coupling element (21a) and the power supply section (22b) of the second coupling element (21b) are connected to each other via a wireless coupling section (23) for electrically insulating the data line (20). Ｚ ) ) ) ) ) ) ) ) ).

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

3. A power supply line (26) for supplying a supply voltage is provided in the welding equipment (1), a choke coil (27) arranged on the power supply line (26), the choke coil (27) being configured to separate both sides of the choke coil (27) for high frequency voltages occurring on the power supply line (26); and 2. The welding installation according to claim 1, characterized in that the power supply (22a) of the first coupling element (21a) receives the supply voltage on one side of the choke coil (27).

4. 4. The welding installation according to claim 3, characterized in that the power supply (22b) of the second coupling element (21b) receives the supply voltage on the other side of the choke coil (27).

5. The power supply portion (22a) of the first coupling element (21a) and / or the power supply portion (22b) of the second coupling element (21b) are configured as photovoltaic cell modules (32); and 2. The welding installation according to claim 1, further comprising a light source (31) for irradiating the photovoltaic cell module (32) with light.

6. 6. The welding installation of claim 5, further comprising a battery (28) for supplying power to the light source (31).

7. 6. The welding installation according to claim 5, characterized in that power is supplied to the light source (31) from a power supply (22a) of the first coupling-element (21a) and the photovoltaic cell module (32) is provided as a power supply (22b) of the second coupling-element (21b).

8. 8. The welding installation according to claim 7, characterized in that a power supply line (26) having a supply voltage is laid through the electrical insulation device (35), the power supply line (26) being provided as a power supply part (22a) of the first coupling element (21a).

9. 9. The welding installation according to claim 1, wherein the electrical insulation device (35) is constructed as an independent unit in the form of an electrical insulation box (30).

10. A method for electrically isolating a data line (20) from high frequency voltages on the data line (20), comprising: Data (D) is exchanged between the welding device (2) and the welding components connected to the welding device (2) via the data line (20), and a high-frequency ignition voltage (u) to be input to the welding cable for high-frequency ignition of an arc for welding by the welding device (2) is determined. Ｚ ) is generated by the high frequency ignition unit (17), The high frequency ignition voltage (u Ｚ ) in said method for generating a high frequency voltage on said data line (20), The data line (20) is electrically insulated into a first data line section (20a) and a second data line section (20b), 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 first coupling element (21a) and the second coupling element (21b) are connected to each other via a wireless coupling section (23); and The method according to claim 1, wherein the first coupling element (21a) and the second coupling element (21b) are each powered by a unique power supply portion (22a, 22b), and the power supply portion (22a) of the first coupling element (21a) and the power supply portion (22b) of the second coupling element (21b) are electrically isolated from each other for a high frequency voltage on the data line (20).

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