Flexible pipe bend for a welding torch

Abstract

Flexible pipe bend (29) for a water-cooled welding torch (7), in which a nozzle holder (30) for receiving a contact tube (31) and a gas nozzle (34) is arranged at one end and a central connection (32) for attaching the pipe bend (29) to a torch holder is arranged at the other opposite end, wherein the two ends are connected to each other via a flexible connecting element (33), which serves to stably position the arc components and to receive a wire guide core and / or the welding wire (9) respectively.the electrode, is designed for guiding a protective gas inside it and is formed from a flexible, swan-neck-shaped adjusting arm (38) and a current cable (39), characterized in that the current cable (39) is designed for current conduction, shaping and stabilization a) by several defined wound copper wires and copper tubes (40) or b) by several defined wound copper tubes (40), wherein the copper tubes (40) in cases a) and b) are designed for guiding cooling water, and that the adjusting arm (38) is connected at both ends in a fixed connection to the copper wires and / or copper tubes (40), which are continuously and alternately wound around the adjusting arm (38) in one plane.

Description

[0001] The invention relates to a flexible pipe bend for a welding torch, wherein a nozzle holder for receiving a contact tube and a gas nozzle is arranged at one end and a central connection for attaching the pipe bend to a torch holder is arranged at the opposite end, the two ends being connected to each other via a flexible connecting element, which is designed for the stable positioning of the arc components, in particular a welding wire or an electrode, and for receiving a wire guide liner and / or the welding wire or the electrode, and which is prepared for the guidance of a shielding gas within it. The connecting element comprises a flexible, gooseneck-shaped adjusting arm and a power cable, as described in the preamble of claim 1.

[0002] A flexible welding torch elbow is already known from AT 508 570 A1, in which a nozzle holder for receiving a contact tube and a gas nozzle is arranged at one end, and a central connection for attaching the elbow to a torch holder is arranged at the opposite end, with the two ends being connected to each other via a flexible connecting element. The connecting element is designed such that mechanical separation is provided for stability and current transmission by means of an adjusting arm for the stable positioning of the arc components, in particular a welding wire or an electrode. A highly flexible power cable is routed around the adjusting arm, and the adjusting arm is designed to receive a wire guide liner and / or the welding wire or an electrode. A shielding gas is guided within the adjusting arm.The power cable is formed from a braid of high-strength and flexible individual strands, preferably made of copper. The adjusting arm is formed from a corrugated hose known from the prior art, in particular a so-called gooseneck.

[0003] A disadvantage of this design is that, in such a setup, only the gooseneck-shaped positioning arm is responsible for the bending properties and maintaining the position of the manually bent pipe bend. This means that all opposing forces act on the arm, and over time, the position is no longer held by the positioning arm, causing the contact nozzle or welding wire to shift. In automated applications, this has a very negative impact on the welding process, as the weld bead is no longer formed in the desired position.

[0004] Furthermore, solutions using copper spring wires or steel springs and copper wires are known, but these do not offer sufficient service life. These solutions use standard copper wires, which lack good bending properties and therefore break. In such designs, the mechanical forces act directly on the copper wires, causing them to deform and thus break more quickly, as they can deform during the bending process.

[0005] Finally, flexible pipe bends for welding torches are known from JP H09-295153A, US 2,666,832A, US 3,755,648A and JP S60-72683A, which have spirally wound wires for guiding a welding current.

[0006] The object of the invention is to create a flexible pipe bend and a welding torch in which the aforementioned disadvantages of the inaccurate position support by the adjusting arm are eliminated or at least improved.

[0007] This task is solved for a flexible pipe bend by designing the power cable for current conduction, shaping, and stabilization using several precisely wound copper wires or copper tubes, and by connecting the swan-neck arm at both ends to the copper wires or copper tubes, which are continuously and alternately wound around the arm in one plane. A swan-neck arm is generally a flexible, yet semi-rigid arm made of coiled metal tubing.

[0008] The advantage here is that the use of a gooseneck-shaped adjusting arm provides a defined bending radius, designed to allow for the smooth feeding of the welding wire through the gooseneck tube. A further advantage is that fixing the wires or tubes to the adjusting arm ensures that the length of the pipe bend does not change during bending, as was the case with the prior art. This occurred because the highly flexible power cable was not connected to the adjusting arm and could therefore expand during bending, causing slight displacement of the attached nozzle holder and / or central connection. Thus, the new design significantly increases accuracy, as the TCP (Tool Center Point) remains unchanged during bending.The use of multiple wires or tubes is also advantageous, as the total cross-section is the sum of the individual cross-sections. This allows for flexibility and ensures reliable power transmission for higher loads. A further significant advantage is that the support function of the adjusting arm prevents the wire or tube windings from deforming during bending, thus considerably increasing their lifespan and the number of bends they can withstand. Furthermore, the use of a gooseneck tube provides high stability for the wound copper wires or tubes, as it acts as a support structure.Furthermore, the use of a swan neck tube ensures that a defined minimum radius is specified, thus preventing the copper wires or copper tubes from being overstressed, and significantly increasing the number of possible bending cycles for such a copper wire or copper tube.

[0009] Another significant advantage is that, due to the arrangement of the wound copper wires or copper tubes, even a large bending angle of the connecting element causes no or minimal deformation of the wires or tubes.

[0010] Furthermore, it is advantageous that the mutual stabilization of the precisely wound, electrically conductive copper wires or tubes prevents expansion and twisting of the connecting element. The use of the adjusting arm creates a defined minimum radius during bending, which cannot be undercut, thus ensuring unimpeded feeding of the welding wire.

[0011] By permanently connecting the copper wires or tubes to the ends of the adjusting arm, a torsional rigidity is advantageously achieved, as the individual spirals or wound wires stabilize each other and prevent twisting. This also ensures precise length stability, since the wires or tubes cannot shift relative to the adjusting arm during bending, thus guaranteeing the fixed position of the attached components.

[0012] It is also advantageous to have a design in which the copper wires or copper tubes each have a diameter between 3 and 5 mm, preferably 4 mm, since this also allows the wires to absorb the bending forces and thus supports the positioning arm in stabilizing its position.

[0013] However, it is also advantageous if the number of copper wires or copper pipes is matched to a required total cross-section of between 30mm 2 and 50mm 2 depending on the required burner output, as this makes the deformability and stability independent of the burner output.

[0014] It is also advantageous if the copper wires or copper tubes are arranged at an angle between 65° and 75° to the longitudinal axis of the adjusting arm or the welding torch, so that the deformability and stability are predetermined or defined.

[0015] In an embodiment of the invention in which the beginning and end of the copper wires are evenly divided around a diameter of a transition piece and connected to these, it is advantageously achieved that the fastening of the further components is made easier.

[0016] Finally, a design in which the copper wires or copper tubes are insulated from each other is also advantageous. This effectively prevents arcing between the windings during bending.

[0017] Further advantageous features are described in the figure description. The resulting advantages can also be found in this description.

[0018] The present invention is explained in more detail with reference to the attached schematic drawings.

[0019] It shows: Fig. 1 a schematic representation of a welding machine or welding equipment; Fig. 2 a schematic representation of a pipe bend in longitudinal section; Fig. 3 a schematic representation of the in Fig. 2 shown in cross-section of the pipe bend; Fig. 4 A side view of the pipe bend without rubber hose in a simplified, schematic representation; Fig. 5 A side view of the pipe bend with rubber hose in a simplified, schematic representation; Fig. 6 a perspective view of the pipe bend without rubber hose; Fig. 7 a schematic representation of the pipe bend that is bent in the area of ​​the nozzle holder; Fig. 8 a schematic representation of the pipe bend that is bent in the area of ​​the central connection; Fig. 9 a schematic representation of the pipe bend, which is bent in a semicircle; Fig. 10 a schematic representation of the pipe bend, which is bent in an S-shape and Fig. 11 a schematic representation of the pipe bend, which is even more strongly S-shaped.

[0020] By way of introduction, it should be noted that the figures are described in a coherent and comprehensive manner, whereby identical parts in the differently described embodiments are provided with the same reference numerals or component designations, and the disclosures contained in the entire description can be applied analogously to identical parts with the same reference numerals or component designations. Furthermore, the positional designations chosen in the description, such as top, bottom, side, etc., refer to the directly described and illustrated figure and are to be applied analogously to the new position if the position changes. Similar components or functionally similar components bear the same reference numerals with different indices. Moreover, individual features or combinations of features from the different illustrated and described embodiments can also represent independent, inventive, or inventive solutions.

[0021] In Fig. Figure 1 shows a welding machine or welding system for various processes or procedures, such as MIG / MAG welding or TIG / WIG welding or electrode welding, double wire / tandem welding, plasma or soldering, etc.

[0022] The welding machine 1 comprises a power source 2 with a power unit 3 arranged therein, a control device 4 and other components and lines not shown, such as a switching element, control valves, etc. The control device 4 is, for example, connected to a control valve which is arranged in a supply line for a gas 5, in particular a shielding gas, such as CO2, helium or argon and the like, between a gas storage tank 6 and a welding torch 7 or a burner.

[0023] Furthermore, a wire feeder 8, which is common for MIG / MAG welding, can be controlled via the control device 4, whereby a filler material or welding wire 9 is supplied from a supply drum 10 or a wire spool to the area of ​​the welding torch 7 via a supply line. Of course, it is possible that the wire feeder 8, as is known from the prior art, is integrated into the welding machine 1, in particular into the housing 11 of the power source 2, and not, as in Fig. Figure 1 shows the wire feeder 8 positioned as an accessory on a trolley 12. This is referred to as a "compact welding machine" 1. It is also possible for the wire feeder 8 to be mounted directly onto the welding machine 2, i.e., the housing 11 of the power source 2 is designed on the top side to accommodate the wire feeder 8, thus eliminating the need for the trolley 12.

[0024] It is also possible that the wire feeder 8 feeds the welding wire 9 or the filler material to the process point outside the welding torch 7, whereby a non-consumable electrode is preferably arranged in the welding torch 7, as is common, for example, in TIG welding.

[0025] The current for establishing an arc 13, in particular a working arc, between the electrode or welding wire 9 and a workpiece 14, preferably formed from one or more parts, is supplied to the welding torch 7, in particular to the electrode or welding wire 9, via a welding cable (not shown) from the power section 3 of the power source 2. The workpiece 14 to be welded is connected to the power source 2 (not shown) via another welding cable for a further potential, in particular via a ground cable. In this way, a circuit is closed via the arc 13 or the plasma jet generated for a welding process. When using a torch with an internal arc 13, the two welding cables (not shown) are led to the torch so that a corresponding circuit can be established in the torch, as can be the case with plasma torches.

[0026] To cool the welding torch 7, the welding torch 7 can be connected via a cooling unit 15, with the interposition of further components such as a flow monitor, to a liquid reservoir, in particular a water reservoir 16 with a level indicator 17. This causes the cooling unit 15, in particular a liquid pump used for the liquid in the water reservoir 16, to be started when the welding torch 7 is put into operation, thus cooling the welding torch 7. As shown in the illustrated embodiment, the cooling unit 15 is positioned on the trolley 12, onto which the power source 2 is then placed. The individual components of the welding system, i.e., the power source 2, the wire feeder 8, and the cooling unit 15, can be designed such that they have corresponding projections or recesses so that they can be securely stacked on top of each other.can be stacked on top of each other.

[0027] The welding machine 1, in particular the power source 2, further comprises an input and / or output device 18, via which the various welding parameters, operating modes, or welding programs of the welding machine 1 can be set, accessed, and displayed. The welding parameters, operating modes, or welding programs set via the input and / or output device 18 are transmitted to the control device 4, which then controls the individual components of the welding system or the welding machine 1 and sets corresponding target values ​​for regulation or control. It is also possible, when using a suitable welding torch 7, for adjustments to be made via the welding torch 7, which is equipped with a welding torch input and / or output device 19 for this purpose.Preferably, the welding torch 7 is connected to the welding machine 1, in particular the power source 2 or the wire feeder 8, via a data bus, in particular a serial data bus.

[0028] To start the welding process, the welding torch 7 usually has a start switch (not shown) so that the arc 13 can be ignited by pressing the start switch. To protect against the intense heat from the arc 13, the welding torch 7 can be equipped with a heat shield 20.

[0029] Furthermore, in the illustrated embodiment, the welding torch 7 is connected to the welding machine 1 or the welding system via a hose assembly 21, the hose assembly 21 being attached to the welding torch 7 by means of a strain relief 22. Individual lines are arranged within the hose assembly 21 between the welding machine 1 and the welding torch 7, such as the supply line or lines for the welding wire 9, for the gas 5, for the cooling circuit, for data transmission, etc. In contrast, the ground cable is preferably connected separately to the power source 2. The hose assembly 21 is connected to the power source 2 or the wire feeder 8 via a coupling device (not shown), while the individual lines within the hose assembly 21 are attached to or inside the welding torch 7 by means of strain relief.To ensure adequate strain relief of the hose assembly 21, the hose assembly 21 can be connected to the housing 11 of the power source 2 or the wire feeder 8 via a strain relief device (not shown).

[0030] It should be noted that not all of the previously mentioned components need to be used for the various welding processes or welding machines 1, such as TIG, MIG / MAG, or plasma welding machines. For example, the welding torch 7 can be designed as an air-cooled welding torch 7, thus eliminating the need for the cooling unit 15. Therefore, the welding machine 1 can also consist solely of the power source 2, the wire feeder 8, and the cooling unit 15, with these components potentially being arranged in a common housing 11. Furthermore, it is possible to add other parts or components, such as a grinding guard 23 on the wire feeder 8 or an option carrier 24 on a holding device 25 for the gas reservoir 6, etc.

[0031] In the Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. Figure 11 shows a flexible pipe bend 29 for a welding torch 7. Flexible pipe bends are known per se. For example, a flexible pipe bend is included in AT 508 570 A1. The basic structure of such a flexible pipe bend will therefore not be described in detail here, but only the essential differences according to the invention between the pipe bend 29 according to the invention and pipe bends known from the prior art will be referred to.

[0032] As previously known, the pipe bend 29 is designed such that a nozzle holder 30 for receiving a contact tube 31 is arranged at one end, and a central connection 32 for attaching the pipe bend 29 to a burner holder (not shown) is arranged at the opposite end, with the two ends being connected to each other via a flexible connecting element 33. It is also possible for further components, such as a gas nozzle 34, a union nut 35, or the like, to be attached to or arranged on the nozzle holder 30 or the central connection 32.

[0033] In the illustrated pipe bend 29, the nozzle holder 30 and the central connection 32 are connected via the flexible connecting element 33. This means that the curvature of the pipe bend 29 can be adjusted as desired via the connecting element 33, allowing optimal adaptation of the nozzle holder 30, and in particular of the welding wire 9 exiting the contact tube 31, to the welding task. Thus, even hard-to-reach areas can be welded in the usual welding position, as the user can simply bend the pipe bend 29 into position, as is the case, for example, in the Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. Figure 11 illustrates that the pipe bend 29 can be deformed / bent in a variety of ways and with different radii. It can be seen that the maximum bending radii are designed to ensure the proper feeding of the welding wire 9 through the connecting element 33.

[0034] The connecting element 33 is designed such that mechanical separation is provided for stability and current transmission by means of a gooseneck-shaped adjusting arm 38 for the stable positioning of the arc components, in particular the welding wire 9 or an electrode (not shown). Preferably, the adjusting arm 38 is also designed to accommodate a wire guide liner and / or the welding wire 9 or a non-consumable electrode for a TIG / WIG torch, wherein further elements required for a welding process, such as the shielding gas, are preferably guided within the adjusting arm 38.

[0035] As the adjusting arm 38 (as also in AT 508 570 A1), a so-called gooseneck, as known from the prior art, is used, so a detailed description of the construction is omitted. For example, such adjusting arms 38 are sold by Boa AG from Rothenburg or by Flexperte www.flexperte.de under "Bendable Arms" Type: BA 151L11. These adjusting arms 38 are both flexible and rigid and consist of a combination of an inner round wire with a triangular helix pressed in from the outside.

[0036] According to the current state of the art, a highly flexible cable is now routed around the adjusting arm 38. This cable does not absorb any mechanical forces to stabilize the position and is therefore solely designed for conducting current. In this design, the cable consists of numerous fine strands, allowing it to bend easily. However, without assistance, it does not remain in this bent position but returns to its straight starting position.

[0037] According to the invention, the power cable 39 is designed for conducting current and also for stabilizing, positioning, and shaping the arc components, i.e., the nozzle assembly, by being formed from several definedly wound copper wires or copper tubes 40, wherein the individual copper wires or copper tubes 40 are continuously and alternately wound around the adjusting arm 38 in one plane. This means that the adjusting arm 38 and the power cable 39 are now designed independently of each other to absorb the mechanical forces, in particular the bending forces, restoring forces, etc., so that significantly better dimensional stability of the torch / tube arc 29 is achieved, since there are now two components for absorbing the forces. One can therefore say that several copper wires or copper tubes 40 form the power cable 39. However, it is also conceivable that the power cable 39, i.e., the wires or copper tubes provided for its construction, is formed from several copper wires or copper tubes 40.Pipes 40 can be made not only of copper, but also of other electrically conductive materials, such as silver or silver alloys.

[0038] To ensure good length stability during bending, the copper wires or copper tubes 40 of the power cable 39 are fixedly connected to the ends of the adjusting arm 38. This prevents them from being pushed beyond the adjusting arm 38 or from shortening during bending. The expansion and contraction processes that occur during bending are compensated for by the individual windings, thus ensuring that the tube bend length always remains constant. The copper wires or copper tubes 40 can be attached to the adjusting arm 38, for example, by means of a crimp sleeve and / or by soldering. However, any other suitable fastening method, such as clamping, riveting, welding, gluing, etc., can also be used. At the same time, the other components, in particular the nozzle holder 30 and the central connection 32, are also attached at the ends.The gooseneck tube is connected to the ends of the copper wires and / or copper tubes 40 and the other components, in particular the central connection 32 and the nozzle assembly 30. This fixed connection prevents the copper wires and / or copper tubes 40 from expanding in length and from twisting when the flexible tube bend 29 is bent, since the adjusting arm 38 serves as a support. This fixed connection between the two components also defines a minimum radius, thus preventing the tube bend 29 from kinking beyond an impermissible radius. This radius is primarily defined by the design of the gooseneck tube; that is, different burners with different bending radii can be manufactured by using different gooseneck tubes.

[0039] To ensure a long service life and a high number of bending cycles for the pipe bend 29, it is necessary that the copper wires or copper tubes 40 are appropriately shaped and wound. The copper wires or copper tubes 40 each have a diameter between 3 and 5 mm, preferably 4 mm. Thus, depending on the required burner output, the individual copper wires or copper tubes 40 form a total cross-sectional area of ​​between 30 mm². 2 and 50mm 2This means that the required cross-section for the corresponding current flow is divided among several copper wires or copper tubes 40, thereby reducing the thickness of the pipe bend 29, i.e., the outer diameter of the connecting element 33, while simultaneously improving the bending properties and positional stability. To enable easy bending of the pipe bend 29, the orientation of the individual windings of the copper wires or copper tubes 40 to the longitudinal axis 41 of the pipe bend 29 must be considered. If the winding is too flat, the bending properties will be good in the horizontal direction but very poor in the vertical direction, and vice versa. To ensure good bending properties in both the vertical and horizontal directions, the copper wires or copper tubes 40 are preferably arranged at an angle 43 between 60° and 75° to the longitudinal axis 41 of the adjusting arm 38 or the welding torch 7.

[0040] When designing the pipe bend 29, it should also be noted that the arrangement of several copper wires or copper tubes 40 should, if possible, be in one plane. The beginning and end of the copper wires or copper tubes 40 are evenly spaced around a diameter of the adjusting arm 38, in particular the swan-neck tube, and connected to it, as shown in Fig. 3 is most clearly visible in the area of ​​the central connection 32.

[0041] When winding the copper wires or copper tubes 40, the winding process is carried out alternately along the adjusting arm 38. This means that, for example, with six copper wires or copper tubes 40, all six are first arranged consecutively in the first winding, and only then are the second windings of the individual copper wires or copper tubes 40 formed, as well as the subsequent windings. Thus, the wires always alternate. Preferably, the tube bend 29 is wound with only one layer, with the wires preferably arranged next to each other without gaps. The individual windings are also designed to insulate against each other. Furthermore, the use of an adjusting arm 38 ensures that the winding shape of the copper wire or copper tube 40 is supported by the adjusting arm 38 during bending, so that the copper wire or copper tube 40 cannot kink. This significantly increases the service life and the number of bends that can be performed.

[0042] If the pipe bend 29 is used for a water-cooled welding torch 7, it is recommended that individual copper tubes 40 be used through which the cooling medium is guided. For example, three of the six copper tubes 40 can be used as supply lines and the other three as return lines, with the corresponding connections of the ends of the copper tubes 40 being integrated into the nozzle assembly or made by means of additional lines. However, it is also possible that all copper tubes 40 are designed as supply lines and the return line runs within the adjusting arm 38, or that all lines for cooling are arranged within the adjusting arm 38, in which case a gooseneck tube with a larger diameter is advantageously used. Copper tubes 40 are preferably used within this gooseneck tube.

[0043] For the dimensioning of such a pipe bend 29 or welding torch, for example, a diameter of 3 to 4 mm for the copper tubes 40 can be used with 4 to 7 copper tubes 40 in a water-cooled torch, resulting in a total cross-section between 25 and 35 mm. 2 This results in a current transmission of up to 520A. A typical design for an air-cooled burner might, for example, use a 3 to 4mm thick copper wire 40, of which four to seven individual copper wires 40 are arranged around the circumference, resulting in a total cross-section of 40 to 50mm². 2 This is achieved, thus enabling current transmission of up to 320A. Both welding torches 7 or pipe bends 29 have the same outer diameter of the connecting element 33. Of course, it is also possible to produce more powerful or less powerful pipe bends by appropriate dimensioning.

[0044] It is also possible that instead of round copper wires or copper tubes, 40 other shapes, such as triangular wire coils, are used, whereby these in turn should be dimensioned for the corresponding performance range.

[0045] To protect the user from electric shock, the live parts, in particular the adjusting arm 38 with the power cable 39 wound on it, are covered with a protective sleeve 49, in particular a rubber sleeve, as shown in the Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. 11 is evident.

[0046] Of course, it is possible that the previously described pipe bend 29 can also be used with a welding torch 7, i.e., that the flexible pipe bend 29 is fixedly or pluggably attached to the torch handle, so that the user can bend the pipe bend 29 as desired before or during the welding process. Reference numeral list 1 welding machine 2 Power source 3 Performance section 4 Control device 5 Gas 6 gas storage tanks 7 welding torches 8 Wire feeder 9 welding wire 10 storage drum 11 cases 12 trolleys 13 arcs 14 workpieces 15 Cooling unit 16 water containers 17 Level indicator 18 Input and / or output device 19 Welding torch inlet and / or outlet device 20 Heat shield 21 Hose package 22 Base plate 23 wheel 24 Holding device 25 mounting plate 26 option holders 27 recording elements 28 Trolley infeed and / or outfeed device 29 pipe bends 30 nozzle holder 31 Contact tube 32 Central connection 33 Connecting element 34 Gas nozzle 35 Union nut 38 actuating arm (gooseneck tube)

Claims

[1] Flexible pipe bend (29) for a water-cooled welding torch (7), in which a nozzle holder (30) for receiving a contact tube (31) and a gas nozzle (34) is arranged at one end and a central connection (32) for attaching the pipe bend (29) to a torch holder is arranged at the other opposite end, wherein the two ends are connected to each other via a flexible connecting element (33), which is designed for the stable positioning of the arc components and for receiving a wire guide core and / or the welding wire (9) or the electrode, is provided for guiding a shielding gas inside it and is formed from a flexible positioning arm (38) designed as a gooseneck tube and a power cable (39), characterized by, that the power cable (39) is designed for current conduction, shaping and stabilization a) by several defined wound copper wires and copper tubes (40) or b) by several defined wound copper tubes (40), wherein the copper tubes (40) in cases a) and b) are designed to carry cooling water, and that the actuating arm (38) is connected at both ends in a fixed connection to the copper wires and / or copper tubes (40) which are continuously and alternately wound around the actuating arm (38) in one plane. [2] Flexible pipe bend according to claim 1, characterized by , that the copper wires and / or the copper tubes (40) each have a diameter between 3 and 5 mm. [3] Flexible pipe bend according to claim 1 or 2, characterized by , that a number of the copper wires and / or copper tubes (40) are connected to a required total cross-section between 30mm 2 and 50mm 2 is adjusted depending on the required burner output. [4] Flexible pipe bend according to any one of the preceding claims, characterized by , that the copper wires and / or copper tubes (40) are arranged at an angle (43) between 65° and 75° to the longitudinal axis (41) of the adjusting arm (38) or the welding torch (7). [5] Flexible pipe bend according to any one of the preceding claims, characterized by , that the beginning and the end of the copper wires and / or copper tubes (40) are evenly spaced around a diameter of the adjusting arm (38) and connected to them. [6] Flexible pipe bend according to any one of the preceding claims, characterized by , that the copper wires and / or copper tubes (40) are electrically insulated from each other. [7] Flexible pipe bend according to any one of the preceding claims, characterized by , that a welding wire (9) or an electrode is provided as an arc component.

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