JP2015057297A - Weldment head and weldment head assembly for arc-welding system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode assembly, method and device for permitting an improved welding speed.SOLUTION: An weldment head 100 for electric arc welding including a contact device 170 and one or more wire feeder units 130 and 150, in which a contact device 160 includes an electrode assembly 170, and the electrode assembly 170 includes at least two soluble wire electrodes 172, 174 and 176 which are disposed in the contact device 160 and are continuously supplied. In the electrode assembly 170, an electrically insulated duct 180 for at least one electrode 174 is provided so that the electrode 174 is electrically isolated from other electrodes 172 and 176.

Description

  The present invention relates to a welding head for an arc welding system and a welding head assembly for an arc welding system, particularly a submerged arc welding including an electrode assembly having multiple electrodes.

  Submerged arc welding is a fully mechanized welding process characterized by high productivity and quality, often used for longer weld seams in thicker materials. During the submerged arc welding operation, one or more sequentially arranged welding electrodes melt into the arc.

  Welding points, particularly melting materials and arcs, are protected under the layer of granular flux. During the process operation, the flux is partially melted. Therefore, a protective layer of slag is created on the weld pool. The current used in the process is relatively high and is typically in the range of 300-1500 amps per electrode. The electrode used in submerged arc welding is usually 2.5 to 6 mm in diameter.

  The flux used in submerged arc welding is a particulate fusible mineral that generally includes oxides of manganese, silicon, titanium, aluminum, calcium, zirconium, magnesium and other compounds (eg, calcium fluoride). The flux is specifically prepared to be compatible with a given type of electrode wire so that the combination of flux and wire produces the desired mechanical properties. All fluxes react with the weld pool to produce weld metal chemistry and mechanical properties. It is common to call the flux “active”. And when they add manganese and silicon to the weld, the amount of manganese and silicon added is affected by the level of arc voltage and welding current.

  To find the highest productivity possible with submerged arc welding, one result is increased competitiveness, increased welding speed and the highest possible deposition rate (ie melting welding consumables per time and electrode) , Or truly created binding materials).

  One solution to this known in the art is to use a plurality of electrodes located sequentially in the direction of the weld seam. Usually, two to three electrodes are used. However, the use of up to six electrodes is known.

  It is known that the addition of a metal that melts without an arc can improve the deposition rate during welding. For example, metal powder or metal wire can be added during arc welding.

  Cited Document 1 discloses an arrangement that improves the deposition rate during submerged arc welding of workpiece 10. The general principle is shown in FIG. Three consecutively supplied wire electrodes 30, 36, 40 arranged in series along the weld seam are consumed in the arc while moving in the welding direction 20. The electrodes 30, 36, 40 are also known as “hot” or “hot wire” electrodes. Two additional electrodes 32, 38 that are consumed without forming an arc are fed continuously into the molten weld pool 12 in the region of the arc of the intermediate electrode 36. These additional electrodes 32, 38, also known as “cold wires” or “cold wire electrodes”, are at the contacts that are continuously shorted to the weld pool 12. The two electrodes 32, 38 that are consumed in the molten weld pool 12 without forming an arc are melted by resistance heating as well as by the heat generated by the intermediate electrode 36. This process uses flux to generate protective gas and slag and to add alloying elements to the weld pool 12. No additional shielding gas is required. Prior to welding, a thin film layer of flux powder is placed on the surface of the workpiece. The arc moves along the bond line in the welding direction 20. Accordingly, the flux is supplied to the welding area by the flux supply hopper. Since the arc is completely covered by the flux layer, the heat loss is very small. This generates as much as 60% thermal efficiency compared to 25% for manual metal arcs. There is no visible arc beam, the weld is virtually sputter free, and there is no need for degassing.

  It would be desirable for the solution described above to provide better operation of this type of cold electrode, even when increasing the deposition rate during welding.

British patent GB 1400051 A

  It is an object of the present invention to provide an electrode assembly that allows improved welding speed. Another object of the present invention is to provide a method having improved welding speed as well as satisfactory welding quality. Another object is to provide an apparatus for performing this type of method.

  The object is achieved by the features of the independent claims. Other claims and descriptions disclose advantageous embodiments of the invention.

  According to a first aspect of the present invention, comprising a contact device and a feeder part, the contact device comprising an electrode assembly, the electrode assembly being supplied continuously with at least two fusible elements arranged in the contact device. A welding head for electric arc welding including a wire electrode is proposed. In an electrode assembly in a contact device, an electrically insulated duct for electrical insulation of the electrode is provided so that at least one electrode is electrically isolated from the other electrode.

  The electrically insulated duct includes an insulated portion in the wire feeder and wire straightening unit, and a guide tube outside the feeder and straightening unit. The duct can be composed of a number of electrically isolated sections along electrodes that are electrically isolated from a wire reservoir (eg, a wire bobbin to a contact device near the workpiece to be welded). Preferably, an electric arc welding head is used for submerged arc welding. Submerged arc welding can be operated as a fully mechanized or automated process, and optionally it can be semi-automated. Typical welding parameters are all current, arc voltage and feed rate that can affect the bead shape, penetration depth and chemical composition of the weld metal deposited from the electrode.

  Conveniently, the welding head is compact and allows independent operation of at least one electrically isolated electrode compared to the other electrodes in the electrode assembly of the welding head. The electrodes can be supplied by wire bobbins mounted on the rear on so-called “column and boom” devices. The column and boom are rails that move the manipulator carrying the welding head. The column and boom are used to place the welding head in the welding groove. The column and boom may be designed to carry welding equipment such as power supplies, flux handling equipment and electrode coils, as is known in the art of arc welding systems. Preferably, the electrically insulated electrode is a “cold wire” electrode that can be supplied through a spring-loaded contact device inside the ceramic tube. The one or more hot wire electrodes and cold wire electrodes can have separate wire feeders. And it creates a non-joint setup and provides a much wider welding parameter window compared to the joint setup.

  Using a cold wire electrode with one or more hot wire electrodes has the added benefit of reduced heat generation because the cold wire electrode only “melts” into the weld pool and thus reduces the temperature. It offers the possibility of welding about the same amount as the three hot wire electrodes. This in turn allows separate thermal shocks on the weld workpiece. And it is often very beneficial and opens up to higher productivity. For the expectation of nearly 50% productivity improvement with optimized welding parameters, the increase in deposition rate can exceed 20%. The present invention allows for higher deposition rates without increasing the welding speed. For convenience, the present invention allows retrofitting existing welding systems, particularly for welding large workpieces (eg pipe mills).

  According to a preferred embodiment of the present invention, the electrically insulated duct can include a wire conduit that is electrically insulated in the contact device. The insulated wire conduit can be a ceramic tube disposed in the contact device. The ceramic tube can be inserted into the contact device. Alternatively, a portion of the contact device can be treated (eg, oxidized) to form a sufficiently thick oxide for electrical isolation.

  According to a preferred embodiment of the present invention, the electrically insulated duct can include an electrically insulating portion in a wire straightening unit for straightening one or more electrodes. Hot and cold electrodes can be operated in the same wire linearization unit.

  According to a preferred embodiment of the present invention, individual wire linearization units can be provided for electrically isolated electrodes that are separate from the wire linearization units of the other electrodes of the electrode assembly. Conveniently, the electrically isolated electrode can be operated independently of other, especially hot wire electrodes.

  According to a preferred embodiment of the present invention, the electrically insulated duct can include an electrically insulating portion in a wire feeder unit for supplying one or more electrodes towards the workpiece. Hot and cold electrodes can be operated in the same wire feeder unit.

  According to a preferred embodiment of the present invention, individual wire feeder units can be provided for electrically insulated electrodes that are separate from the wire supply units of the other electrodes of the electrode assembly. Conveniently, the electrically isolated electrode can be operated independently of other, especially hot wire electrodes.

  According to a preferred embodiment of the present invention, individual speed control units can be provided for the electrically isolated electrodes that are separate from the speed control units of the other electrodes of the electrode assembly. Conveniently, the electrically isolated electrode can be operated independently of other, especially hot wire electrodes.

  Conveniently, the electrically isolated electrode can be supplied independently from other electrodes in the contact device. This allows comfortable control of the welding process. Electrically insulated electrodes (cold wire electrodes) can be supplied by separate speeds, in particular variable speeds and / or separate diameters, independent of the other electrodes in the contact device.

  According to a preferred embodiment of the invention, the electrodes in the electrically insulated duct can be arranged in sequence between the leading and trailing electrodes with respect to the welding direction on the workpiece. The order of the electrically insulated electrodes can be used to adjust the welding deposition rate. This kind of symmetrical arrangement can produce very high welding speeds. The order of the electrically insulated electrodes can be selected according to welding requirements.

  According to a preferred embodiment of the invention, the electrodes in the electrically insulated duct can be placed upstream of the other electrodes of the electrode assembly with respect to the welding direction on the workpiece. Depending on the welding requirements, the order of the electrically insulated electrodes can be selected. The advantage of an asymmetric arrangement of electrodes is that the cold wire can be more easily controlled when any kind of adjustment of the approach angle is required. The outermost electrode can be tilted to a desired angle compared to the other electrodes. The asymmetric arrangement makes it possible in particular to adjust such an angle in an easy way.

  According to a preferred embodiment of the invention, the electrodes in the electrically insulated duct can be arranged downstream of the other electrodes of the electrode assembly with respect to the welding direction on the workpiece. The order of the electrically insulated electrodes can be selected according to welding requirements.

  According to a preferred embodiment of the present invention, the feeder unit and / or the straightening unit for electrodes other than the electrically insulated electrode are for guiding the electrically insulated electrode through the feeder unit. Feedthrough can be provided. Conveniently, the electrically insulated electrodes can pass through the wire straightening unit or wire feeder unit in the feedthrough without interacting with these units or other electrodes. An electrically isolated electrode can be operated independently of other electrodes in the same contact device of the same welding head.

  According to another aspect of the invention, a welding head assembly including at least two electric arc welding welding heads, wherein at least one of the welding heads includes a contact device and a supply portion, the contact device comprising: A welding head assembly is proposed that includes an electrode assembly, the electrode assembly including at least two fusible continuously supplied wire electrodes disposed in a contact device. An electrically insulated duct is provided for electrical insulation of the electrodes such that at least one of the plurality of electrodes is electrically isolated from the other electrodes of the electrode assembly. Conveniently, this type of welding head assembly is a powerful tool for very high deposition rates with reduced thermal shock on the workpiece. The weld quality can therefore be improved.

  According to a preferred embodiment of the invention, the first welding head is in front of the second welding head so that the electrode assembly of each welding head is aligned in sequence along the welding direction during the welding operation. Can be arranged in order. The welding head according to the invention allows a large degree of freedom when designing this type of welding head assembly.

  According to a preferred embodiment of the present invention, the order of the electrically isolated electrodes in each electrode assembly can be the same for each welding head with respect to the other electrodes in each electrode assembly. The welding head according to the invention allows a large degree of freedom when designing this type of welding head assembly.

  According to a preferred embodiment of the present invention, the order of electrically isolated electrodes in one electrode assembly can be reversed with respect to the order of electrically isolated electrodes in the other electrode assembly. The welding head according to the invention allows a large degree of freedom when designing this type of welding head assembly.

  According to a preferred embodiment of the invention, each electrically isolated electrode is a wire straightening unit and / or wire feeder unit, separate from the wire straightening unit and / or feeder unit of the other electrodes of the electrode assembly. Can be provided with. The electrically insulated electrodes are independent of the other electrodes and independent of each welding head, and thus are subject to specific conditions imposed by the material and / or shape and / or ambient conditions of the workpiece being welded. It can be operated with a great degree of freedom in adapting welding parameters for welding requirements.

  In accordance with another aspect of the present invention, an electric arc welding contact device for an electric arc welding head and / or welding head assembly, wherein the electrodes are connected in an electrically insulated manner through the device body and the contact device. An electric arc welding contact device is proposed that includes an electrically insulating portion for guiding and at least one duct for at least another electrode in electrical contact with the device body. Conveniently, a compact device is provided in which one or more electrically isolated electrodes can be used with one or more non-insulated electrodes. One or more electrically non-insulating electrodes can be provided to be consumed in the arc during welding. In contrast, the one or more electrically insulated electrodes can be so-called cold electrodes, meaning that they are not consumed by the arc during welding but melt in the weld pool. Electrically insulated wires can be used with various diameters that are selected independently from the other electrodes of the contact device.

  According to a preferred embodiment of the present invention, the electrically insulating portion can include an electrically insulating tube. The electrically insulating tube can be easily inserted into the device body. For convenience, the tube can be made of a ceramic that provides excellent electrical insulation as well as good heat resistance.

  According to a preferred embodiment of the present invention, the device body can be composed of a main part and a detachable part that can be attached to the main part. The placement of the electrodes in the desired order can be easily achieved or varied.

  According to a preferred embodiment of the present invention, a tip can be provided at the end of the device body. And it has an electrically insulating part for an electrically insulated electrode and a recess for receiving another electrode. Conveniently, the one or more electrodes and electrically insulating portions can be placed in the tip groove in a defined manner and can be safely held during operation.

  According to a preferred embodiment of the invention, the electrically insulating part can be arranged in a symmetrical position between the ducts for the other electrodes. Conveniently, an electrically insulating part for guiding the electrode can be arranged between the two ducts of the electrode. This type of symmetrical arrangement provides a high deposition rate during welding.

  According to a preferred embodiment of the invention, the electrically insulating part can be arranged in an eccentric position with respect to the duct for the other electrode in the device body. In particular, the electrically insulating portion can be provided at a desired angle when approaching the weld pool by tilting the contact device during welding.

  In accordance with another aspect of the present invention, an electric arc welding system, including at least one welding head or at least one welding head assembly, according to at least one of the features described above, for generating a weld pool in a workpiece. Provided. A very versatile system that allows simple adjustment of welding parameters and conditions can be provided.

The present invention, together with the above and other objects and advantages, may best be understood from the following detailed description of the embodiments. However, it is not limited to the embodiment.
FIG. 1 is a welding apparatus having hot and cold electrodes according to the prior art. FIG. 2 is a first view of an exemplary embodiment of an arc welding welding head according to the present invention for submerged arc welding. FIG. 3 is a diagram in which the arc welding welding head of FIG. 2 is rotated 90 ° counterclockwise. FIG. 4 is a perspective view of the arc welding head of FIG. 5a-5e are cross-sectional views 5a, 5e, side views 5b, 5d, and front view 5c showing various contact devices for three wire electrodes. FIG. 6 is a side view of an exemplary embodiment of a welding head for arc welding. FIGS. 7a-7c show the arrangement of electrically insulated electrodes and hot electrodes, the first electrode assembly includes two electrodes (FIG. 7a), and the second electrode assembly is electrically insulated. The third electrode assembly includes three electrodes (FIG. 7c), with the electrically insulated electrode on the outside of the electrode assembly. 8a-8c show the arrangement of two arc welding welding heads, each including an electrically insulated electrode and a hot electrode, wherein the first electrode assembly includes two electrodes at each welding head ( FIG. 8a), the second electrode assembly includes three electrodes (FIG. 8b) where the electrically insulated electrode is the central electrode at each welding head (FIG. 8b), and the third electrode assembly is at each welding head. Including an electrode that is electrically isolated, outside the electrode assembly, includes three electrodes (FIG. 8c).

  In each figure, equivalent or similar elements are referenced by equal reference numbers. The drawings are merely schematic and are not intended to depict specific parameters of the invention in detail. Furthermore, the drawings are intended to represent only exemplary embodiments of the invention and therefore should not be considered as limiting the scope of the invention.

  2-4 represent separate views described together with an exemplary embodiment of a welding head 100 for electric arc welding according to the present invention for submerged arc welding.

  The electric arc welding welding head 100 includes a contact device 160 at its lower end along its longitudinal extension. And it is in close proximity to the workpiece to be welded during the welding operation. Contact device 160 holds electrodes 172, 174, 176 (FIGS. 3 and 4) of electrode assembly 170 of welding head 100. Electrodes 172, 174, 176 exit contact device 160 through outlet 162 at the lower end of contact device 160 facing the workpiece during the welding operation. Wire electrodes 172, 174, 176 may be supplied from respective reservoirs, such as coils (not shown) towards the arc welding head 100.

  The electrode assembly 170 includes, by way of example, three fusible continuously supplied wire electrodes 172, 174, 176 disposed in the contact device 160. Contact device 160 includes an electrically insulating portion 166 for a wire electrode 174 that is electrically isolated. Only the electrically insulated electrode 174 is shown along the extension of the welding head. The other electrodes 172, 176 are shown only in the contact device 160. The non-insulating electrodes 172, 176 can be arranged as so-called twin wires supplied in parallel as a double wire electrode device. The electrically insulating portion 166 is preferably an additional insulated wire conduit made of a refractory material such as ceramic.

  A feeder unit 150 that supplies electrodes toward the contact device 160 is disposed above the contact device 160. In general, feeder unit 150 includes grooved wheels that move wire electrodes 172, 176 (not shown in this portion for obvious reasons) toward contact device 160. The feeder unit 150 includes an electrically insulating portion 156 for supplying through an electrically isolated electrode 174. The electrically insulating portion 156 can be comprised of a feeder wheel having an additional insulating groove for the electrically insulated electrode 174. The electrically insulated electrode 174 can pass freely through the wire feeder unit 150. The feeder wheels are driven by a driving device 152 (for example, an electric motor).

  In addition to the wire feeder unit 150, a flux hopper 114 for supplying granular flux to the contact device 160 through a nozzle (not shown) for submerged arc welding is disposed. In addition to the driving device 152, the wire feeder unit 150 includes a gear having a driving shaft. A supply wheel 154 (FIG. 6) is arranged on the drive shaft of the gear, which can be pressurized by other wheels (not shown). The supply wheel 154 drives the wire electrode forward in the direction of the contact device 160.

  Above the wire feeder unit 150, a wire straightening unit 140 for linearizing the wire electrodes 172 and 176 is disposed. Two rollers (not referenced by reference numbers) represented in the first position of the wire straightening unit 140 are used to exert pressure on three fixed wheels which are arranged perpendicular to each other at the rear of the wire straightening unit. Used. The pressure exerted by the roller on the wheel can be adjusted outside the wire straightening unit 140 via a knob. The pressure of the rollers on the three wheels makes the wire straight. The wire straightening unit 140 includes an electrically insulating portion 146 that allows the electrically insulated electrode 174 to pass freely through the wire straightening unit 140.

  Above the wire straightening unit 140, a separate wire feeder unit 130 for supplying an electrically insulated electrode 174 towards the contact device 160 is arranged. On the wire feeder unit 130, a driving device 132 (for example, an electric motor) that drives a supply wheel of the wire feeder unit 130 is disposed. In addition to the drive device 132, the wire feeder unit 130 includes a gear having a drive shaft. A supply wheel 134 (FIG. 6) is placed on the drive shaft of the gear, which can be pressurized by other wheels (not shown). The supply wheel 134 drives the wire electrode forward in the direction of the contact device 160.

  Above the wire feeder unit 130, a separate wire straightening unit 120 is arranged to straighten the electrically insulated electrode 174. Accordingly, an electrically isolated duct for guiding an electrically isolated electrode 174 from a wire reservoir (eg, wire bobbin (not shown)) to a contact nozzle along the longitudinal extension of the welding head 100. 180 is provided. Between the feeder units 150 and 130 and above the wire straightening unit 120, an electrically insulated wire conduit that receives an electrically insulated electrode 174 can be disposed.

  In particular, the electrically insulated duct 180 includes the electrically insulating portion 146 of the wire straightening unit 140, the electrically insulating portion 156 of the wire feeder unit 150 for the non-insulating electrodes 172, 176, and the electrical of the contact device 160. From electrically insulating part 166 and electrically insulated wire conduit between units 130, 140, 150, 160 and above wire straightening unit 120 for electrically insulated electrode 174. Composed.

  5a-5e represent various views of a contact device 160 described together. Contact device 160 includes a device body 161 that includes a duct for receiving a wire electrode (not shown). Therein, the electrically insulating portion 166 is one of the ducts.

  As an example, the device body 161 is made up of two parts 161a and 161b divided in the vertical direction, in which the detachable part 161b is attached to the main part 161a. The main part 161a has a cylindrical upper part and a lower part slightly recessed with respect to the cut through the center (FIGS. 5a, 5e). The detachable portion 161b is attached to the recessed portion of the main portion 161a with a screw.

  Alternatively, the device body 161 can be a monolithic metal body having one or more holes penetrated for the passage of wire electrodes instead of some parts.

  A small free distance remains between the detachable part 161b and the main part 161a when the parts 161a, 161b are attached to each other. That distance allows the electrodes in contact device 160 to use different wire diameters. Since the electrically isolated electrode is guided separately within the electrically insulating portion 166, the diameter of the electrically isolated electrode should be selected independently of the diameter of the other electrodes in the device body 161. Can do.

  The parts 161a and 161b of the device body 161 surround a tip 163 composed of two parts 163a and 163b. The part 163a is attached to the main part 161a of the device body 161, and the part 163b is attached to the detachable part 161b. The portions 163a and 163b of the distal end portion 163 can be attached to the main portion 161a and the detachable portion 161b by screws inserted into the holes 164a and 164b provided in the main portion 161a and the detachable portion 161b, respectively. .

  The tip 163 may have a smaller diameter compared to the rest of the device body 161, which may have a predominantly cylindrical shape. An electrically insulating portion 166 extends throughout the longitudinal extension of the contact device 160 and is an outlet 169 for an electrically insulated wire electrode (not shown) at the outlet 162 of the tip 163 of the contact device 160. I will provide a.

  As can be seen in the cross-sectional views shown in FIGS. 5a and 5e, the device body 161 has a centrally located electrical location that provides an electrically insulating portion for an electrically isolated wire electrode (not shown). It has an internal section 167 with a static insulating portion 166. The electrically insulating portion 166 is preferably an insulating tube such as a ceramic tube. . Both sides of the central electrically insulating portion 166 are provided with ducts 168a, 168b for wire electrodes (not shown) that are intended to be consumed by the arc during welding. Ducts 168a and 168b include corresponding groove portions in tip portions 163a and 163b. The groove portion forms an enclosure for the wire electrode when the detachable portion 161b of the device body 161 is attached to the main portion 161a.

  A bolt 165 is disposed outside the device body 161. And it holds the device body portions 161a, 161b together via spring elements (eg, disc springs) that provide the contact pressure of the portions 161a, 161b, which are virtually independent of the actual diameter of the wire electrode. To do.

  The electrical contact can be attached to the contact device 160 at a contact portion 164 c disposed on the main portion 161 of the device body 161. The wire connected to the power source is connected to a contact portion 164c for conducting voltage and current to the contact device 160 so that the arc can develop with a non-insulated electrode in electrical contact close to the device body 161. Can.

  In the electrically insulating portion 166, the wire electrode can pass through the contact device 160 without contacting another electrode (not shown).

  FIG. 6 is a side view of an exemplary embodiment of a welding head 100 for arc welding in a virtually similar layout to that shown in FIGS. To avoid unnecessary repetition, reference is made to these drawings for a detailed description of similar elements. Above the wire straightening unit 140, two guide tubes 142, 144 for twin electrodes are provided. The guide tubes 142 and 144 are disposed in the lateral direction with respect to the vertical extension of the welding head 100. An electrically insulated electrode (not shown) between a wire feeder unit 130 for an electrically insulated electrode (not shown) and a wire straightening unit 140 of a non-insulated electrode (not shown). A guide tube 182 is arranged. The driving devices 132 and 152 may include pulse sensors for controlling the speed of the electrodes. Near the contact device 160, a nozzle 116 for the flux hopper 114 (FIGS. 2-4) is disposed. The nozzle 116 is fixed to a rod 118 that is arranged parallel to the longitudinal axis of the contact device 160.

  7 a-7 c show the arrangement of the electrodes in the electrode assembly 170 with respect to the welding direction 20.

  FIG. 7 a shows a first variant of the electrode assembly 170 with an “insulated” electrode 174 and an uninsulated “hot” electrode that are electrically isolated. A second variant of the electrode assembly 170 includes three electrodes 172, 174, 176 having an electrically isolated electrode 174 that is a central electrode and is shown in FIG. 7b. A third variant of electrode assembly 170 is shown in FIG. 7c, including three electrodes 172, 174, 176 having electrically isolated electrodes 174 on the outside of the electrode assembly.

  8a-8c show an array of welding head assemblies 200 including two arc welding welding heads 100a, 100b. Each welding head 100a, 100b includes an electrode assembly 170a, 170b having an electrically isolated electrode 174a, 174b and one or more hot electrodes 172a, 172b. In the first variant of the welding head assembly 200 shown in FIG. 8a, each welding head 100a, 100b includes two electrodes 172a, 174a, 172b, 174b in each welding head 100a, 100b. The electrically isolated electrodes 174 a, 174 b are the outermost electrodes in the welding head assembly 200.

  The second variant is shown in FIG. 8b. Here, each welding head 100a, 100b includes an electrode assembly 170a, 170b having three electrodes 172a, 174a, 176a, 172b, 174b, 176b. In this case, the electrically insulated electrodes 174a and 174b are arranged at the center between the two non-insulated electrodes 172a, 176a, 172b and 176b as the center electrodes of the welding heads 100a and 100b.

  FIG. 8 c has three electrodes 172 a, 174 a, 176 a, 172 b, 174 b, 176 b on each welding head 100 a, 100 b, and the electrically insulated electrodes 174 a, 174 b are outside the welding head assembly 200. 3 shows a third variant.

According to a preferred embodiment of the present invention, a device body tip can be provided at the end of the device body . And it has an electrically insulating part for an electrically insulated electrode and a recess for receiving another electrode. Conveniently, the one or more electrodes and electrically insulating portions can be placed in the tip groove in a defined manner and can be safely held during operation.

Claims (26)

A welding head (100) for electric arc welding comprising a contact device (170) and one or more wire feeder units (130, 150) comprising:
The contact device (160) includes an electrode assembly (170);
The electrode assembly (170) includes at least two fusible continuously supplied wire electrodes (172, 174, 176) disposed in a contact device (160);
In the electrode assembly (170), at least one electrode (174) is electrically insulated for electrical insulation of the electrode (174) so that it is electrically isolated from the other electrodes (172, 176). A welding head characterized in that a duct (180) is provided.   The welding head of claim 1, wherein the electrically insulated duct (180) includes a wire conduit (166) that is electrically insulated at the contact device (160).   The welding head of claim 2, wherein the insulated wire conduit (166) is a ceramic tube disposed in the contact device (160).   The electrically insulated duct (180) includes an electrically insulating portion (146) in a wire straightening unit (120, 140) for straightening one or more of the electrodes (172, 174, 176). The welding head according to any one of claims 1 to 3, further comprising:   Individual wire straightening units (120) are for electrically isolated electrodes (174) that are separate from the wire straightening units (140) of the other electrodes (172, 176) of the electrode assembly (170). The welding head according to claim 1, wherein the welding head is provided.   The electrically insulated duct (180) is electrically connected in a wire feeder unit (130, 150) for supplying one or more electrodes (172, 174, 176) towards the workpiece (10). The welding head according to claim 1, comprising an insulating part (156).   An individual wire feeder unit (130) is provided for an electrically isolated electrode (174) that is separate from the wire supply unit (150) of the other electrode (172, 176) of the electrode assembly (170). The welding head according to any one of claims 1 to 6, wherein the welding head is used.   An individual speed control unit (132) is provided for an electrically isolated electrode (174) that is separate from the speed control unit (152) of the other electrode (172, 176) of the electrode assembly (170). The welding head according to any one of claims 1 to 7, wherein the welding head is used.   The order of the electrodes (174) in the electrically insulated duct (180) between the leading and trailing electrodes (172, 176) with respect to the welding direction (20) on the workpiece (10). The welding head according to any one of claims 1 to 8, wherein   The electrode (174) in the electrically insulated duct (180) is upstream of the other electrodes (172, 176) of the electrode assembly (170) with respect to the welding direction (20) on the workpiece (10). The welding head according to any one of claims 1 to 8, wherein the welding head is arranged in a vertical direction.   The electrode (174) in the electrically insulated duct (180) is downstream of the other electrodes (172, 176) of the electrode assembly (170) with respect to the welding direction (20) on the workpiece (10). The welding head according to any one of claims 1 to 8, wherein the welding head is arranged in a vertical direction.   A feeder unit (150) and / or a straightening unit (140) for the electrodes (172, 176) other than the electrically insulated electrode (174) is provided in the electricity through the feeder unit (150). 12. A welding head according to any one of the preceding claims, characterized in that it provides a feedthrough for guiding the electrically insulated electrode (174). A welding head assembly (200) comprising at least two electric arc welding welding heads (100, 100b), comprising:
At least one of the welding heads includes a contact device (160) and a supply portion (130, 150);
The contact device (160) includes electrode assemblies (170a, 170b);
The electrode assembly (170a, 170b) includes at least two fusible continuously supplied wire electrodes (172a, 174a, 176a, 172b, 174b, 176b) disposed in a contact device (160);
At least one of the electrodes (174a, 174b) such that the electrode (174a, 174b) is electrically isolated from other electrodes (172a, 176a, 172b, 176b) of the electrode assembly (170a, 170b). A welding head assembly, characterized in that an electrically insulated duct (180) for one electrical insulation is provided.   The first welding head (100a) is arranged such that the electrode assemblies (170a, 170b) of each welding head (100a, 100b) are sequentially aligned along the welding direction (20) during the welding operation. 14. The welding head assembly according to claim 13, wherein the welding head assembly is arranged in order in front of the second welding head (100b).   The first welding head (100a) is a second welding head (100a, 100b) so that the electrode assembly (170a, 170b) of each welding head (100a, 100b) is aligned along the welding direction (20) during the welding operation. 15. Welding head assembly according to claim 13 or 14, characterized in that it is arranged in order before the welding head (100b).   The order of the electrically isolated electrodes (174a, 174b) in each electrode assembly (170a, 170b) is relative to the other electrodes (172a, 176a, 172b, 176b) in each electrode assembly (170a, 170b). 16. Welding head assembly according to any one of claims 13 to 15, characterized in that it is the same for the welding head (100a, 100b).   The order of the electrically insulated electrodes (174a) in one electrode assembly (170a) is reversed with respect to the order of the electrically insulated electrodes (174b) in the other electrode assembly (170b); The welding head assembly according to any one of claims 13 to 16.   Each electrically isolated electrode (174a, 174b) is connected to a wire straightening unit (140) and / or feeder unit (140) of the other electrode (172a, 176a, 172b, 176b) of the electrode assembly (170a, 170b). A welding head assembly according to any one of claims 13 to 17, provided with a wire straightening unit (120) and / or a wire feeder unit (130) separate from 150). Electricity for an electric arc welding head (100) according to any one of claims 1-12 and / or a welding head assembly (100, 100a, 100b) according to any one of claims 13-18. An arc welding contact device (160) comprising:
A device body (161), and
An electrically insulating portion (166) for guiding at least one electrode (174; 174a, 174b) in an electrically isolated manner through the contact device (160); and
At least one duct (168a, 168b) for at least another electrode (172, 176; 172a, 176a, 172b, 176b) in electrical contact with the device body (161);
Including electric arc welding contact device.   21. The electric arc welding contact device according to claim 19 or 20, characterized in that the electrically insulating part (166) comprises an electrically insulating tube.   The said device body (161) is comprised from the main part (161a) and the detachable part (161b) which can be attached to the said main part (161a), The any one of Claims 19-21 characterized by the above-mentioned. The electric arc welding contact device according to item.   A tip (163) is provided at the end of the device body (161), which is electrically insulated part (166) for electrically insulated electrodes (174; 174a, 174b), and other 23. Electric arc welding contact device according to any one of claims 19 to 22, characterized in that it has a recess for receiving an electrode (172, 176; 172a, 176a, 172b, 176b).   The electrically insulating part (166) is arranged in a symmetrical position between ducts (168a, 168b) for other electrodes (172, 176; 172a, 176a, 172b, 176b). The electric arc welding contact device according to any one of 19 to 23.   Said electrically insulating part (166) for guiding the electrodes (174; 174a, 174b) is arranged between the two ducts (168a, 168b) of the electrodes (172, 176; 172a, 176a, 172b, 176b). 24. The electric arc welding contact device according to claim 23.   The electrically insulating portion (166) is arranged in an eccentric position with respect to ducts (168a, 168b) for other electrodes (172, 176; 172a, 176a, 172b, 176b) in the device body (161), 25. The electric arc welding contact device according to any one of claims 19 to 24.   Workpiece comprising at least one welding head (100) according to any one of claims 1-12 or at least one welding head assembly (200) according to any one of claims 13-18. Electric arc welding system for creating a weld pool (12) in the piece (10).

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