PAIR OF TWO NOZZLE ASSEMBLY RECEPTACLES FOR A DUAL-WIRE WELDING TORCH AND DUAL-WIRE WELDING TORCH HAVING SUCH A PAIR OF TWO NOZZLE ASSEMBLY RECEPTACLES

Abstract

The invention relates to a pair of two nozzle assembly receptacles (14, 15) for a dual-wire welding torch (1) for two melting welding wires (2, 3), having a torch body (4), a connection (5) for a hose package (6), and having a common gas nozzle (11) and to a dual-wire welding torch (1) with a pair of two nozzle assembly receptacles (14, 15) are constructed as inserts for accommodating and fastening in interfaces (12, 13) in the torch body (4) provided therefor, and the nozzle assembly receptacles (14, 15) respectively have an opening (16, 17) for the accommodation of a nozzle assembly (7, 8) in each case, which openings (16, 17) are arranged at an angle (α) between 0° and 20° to one another, so that the central axes (a, b) of the contact tubes (9, 10) or the welding wires (2, 3) running therein enclose this angle (α) to one another.

Claims

1-15. (canceled)

16. A set of a plurality of pairs of nozzle assembly receptacles (14, 15) for a dual-wire welding torch (1) for two melting welding wires (2, 3), having a torch body (4), a connection (5) for a hose package (6), and having a common gas nozzle (11), for accommodating nozzle assemblies (7, 8) with contact tubes (9, 10), which can be arranged therein, for guiding the welding wires (2, 3), wherein the nozzle assembly receptacles (14, 15) of each pair of nozzle assembly receptacles (14, 15) are constructed as inserts for accommodating and fastening in interfaces (12, 13) in the torch body (4) provided therefor, and the nozzle assembly receptacles (14, 15) respectively have an opening (16, 17) for the accommodation of a nozzle assembly (7, 8) in each case, which openings (16, 17) of each pair of nozzle assembly receptacles (14, 15) are respectively arranged at a different angle (α) between 0° and 20° to one another, so that the central axes (a, b) of the contact tubes (9, 10) or the welding wires (2, 3) running therein enclose this angle (α) to one another, and in that at least one cooling channel (33) for conveying a cooling fluid is arranged in each nozzle assembly receptacle (14, 15).

17. The set of a plurality of pairs of nozzle assembly receptacles (14, 15) according to claim 16, wherein the angle (α) of the openings (16, 17) of the nozzle assembly receptacles (14, 15) of the pairs of nozzle assembly receptacles (14, 15) is 0°, 4°, 8° and 11.5°.

18. The set of a plurality of pairs of nozzle assembly receptacles (14, 15) according to claim 16, wherein, for each pair of nozzle assembly receptacles (14, 15), in each case, a gas dispenser (23) is provided with two openings (24, 25) for the accommodation of the nozzle assemblies (7, 8) and a plurality of holes (26) for conveying a protective gas, wherein the openings (24, 25) for accommodating the nozzle assemblies (7, 8) are orientated in accordance with the angle (α) of the openings (16, 17) of the respective pair of nozzle assembly receptacles (14, 15) to one another.

19. A dual-wire welding torch (1) for two melting welding wires (2, 3), having a torch body (4) with a connection (5) for a hose package (6), and having two nozzle assembly receptacles (14, 15) in each case for accommodating nozzle assemblies (7, 8) with contact tubes (9, 10), which can be arranged therein, for guiding the welding wires (2, 3), and having a common gas nozzle (11), a connection (18) for the feed of a cooling fluid and a connection (19) for the drainage of the cooling fluid being arranged in the torch body (4), wherein the torch body (4) has two interfaces (12, 13) for accommodating and fastening a pair of two nozzle assembly receptacles (14, 15), and the nozzle assembly receptacles (14, 15) of each pair of two nozzle assembly receptacles (14, 15) are constructed as inserts and in each case have an opening (16, 17) for the accommodation of one nozzle assembly (7, 8) in each case, which openings (16, 17) are arranged at an angle (α) between 0° and 20° to one another, so that the central axes (a, b) of the contact tubes (9, 10) or the welding wires (2, 3) running therein enclose this angle (α) to one another, so that in the case of the change of only the pair of two nozzle assembly receptacles (14, 15), the angle (α) of the contact tubes (9, 10) to one another can be changed, and wherein the nozzle assembly receptacles (14, 15) have at least one cooling channel (33) in each case, wherein the at least one cooling channel (33) in each nozzle assembly receptacle (14, 15) with the connection (18) for the feed of the cooling fluid and the connection (19) for the drainage of the cooling fluid in the torch body (4) are connected to one another by means of a cooling channel (20) arranged in the gas nozzle (11).

20. The dual-wire welding torch (1) according to claim 19, wherein the openings (16, 17) of the nozzle assembly receptacles (14, 15) are advantageously orientated symmetrically to an angle bisector at the angle (α) to one another.

21. The dual-wire welding torch (1) according to claim 19, wherein a plurality of pairs of in each case two nozzle assembly receptacles (14, 15) are provided with different angles (α) of the openings (16, 17) to one another, wherein the angle (α) is preferably 0°, 4°, 8° and 11.5°.

22. The dual-wire welding torch (1) according to claim 19, wherein the nozzle assemblies (7, 8) also have at least one cooling channel (34) in each case, which can be connected to the cooling channels (33) of the nozzle assembly receptacles (14, 15).

23. The dual-wire welding torch (1) according to claim 19, wherein the nozzle assembly receptacles (14, 15) may be fastened on the interfaces (12, 13) by means of screws (21).

24. The dual-wire welding torch (1) according to claim 19, wherein the nozzle assemblies (7, 8) are sealed with respect to the nozzle assembly receptacles (14, 15) by means of O-rings (22).

25. The dual-wire welding torch (1) according to claim 19, wherein a gas dispenser (23) is provided with two openings (24, 25) for the accommodation of the nozzle assemblies (7, 8) and a plurality of holes (26) for conveying a protective gas, wherein the openings (24, 25) for accommodating the nozzle assemblies (7, 8) are orientated in accordance with the angle (α) of the openings (16, 17) of the nozzle assembly receptacles (14, 15) to one another.

26. The dual-wire welding torch (1) according to claim 19, wherein a pivotable fixing clip (27) is provided on the torch body (4) for fastening the gas nozzle (11) without tools.

27. The dual-wire welding torch (1) according to claim 19, wherein the gas nozzle (11) has a gas nozzle base body (28) and a gas nozzle mouthpiece (29) connected thereto in a detachable manner.

28. The dual-wire welding torch (1) according to claim 27, wherein the gas nozzle mouthpiece (29) is connected to the gas nozzle base body (28) in a detachable manner by means of a wire clip (30).

29. The dual-wire welding torch (1) according to claim 19, wherein the end (31) of the torch body (4) facing the gas nozzle (11) has a substantially rectangular cross section and the end (32) of the torch body (4) facing the connection (5) for the hose package (6) has a substantially round cross section.

Description

[0026] The invention is explained in more detail on the basis of the attached drawings. In the figures

[0027] FIG. 1 shows a view onto an embodiment of a dual-wire welding torch according to the present invention;

[0028] FIG. 2 shows a view onto the end of the dual-wire welding torch according to FIG. 1 designed for connection to a corresponding hose package;

[0029] FIG. 3 shows an exploded illustration of the dual-wire welding torch according to FIG. 1;

[0030] FIG. 4 shows a sectional image through a part of the front end of the dual-wire welding torch according to FIG. 1;

[0031] FIG. 5 shows a sectional image of the front end of the dual-wire welding torch; and

[0032] FIGS. 6a to 6D show various embodiments of the nozzle assembly receptacles and gas dispensers according to the invention of a dual-wire welding torch according to FIG. 1.

[0033] An embodiment of a dual-wire welding torch 1 according to the present invention is illustrated in FIG. 1. The dual-wire welding torch 1 comprises a torch body 4 with a connection 5 for a hose package 6, which contains the corresponding electric supply lines for the welding wires 2, 3 and the protective gas and possible control lines (not illustrated). The connection between the connection 5 for the end 32 of the torch body 4 facing the hose package 6 and the hose package 6 usually takes place by means of a corresponding plug connection, which can be connected and detached again particularly quickly and easily. The dual-wire welding torch 1 has a gas nozzle 11 at the other end 31, which can be fastened to the torch body 4 by means of a pivotable fixing clip 27. The dual-wire welding torch 1 contains two compact tubes 9, 10 for guiding two welding wires 2, 3. Welds can be produced with a higher melting output with the aid of such a dual-wire welding torch 1. In the exemplary embodiment illustrated, the gas nozzle 11 is constructed in two pieces and consists of a gas nozzle base body 28 and a gas nozzle mouthpiece 29, which are connected to one another by means of a wire clip 30.

[0034] FIG. 2 shows a view onto the end 32 of the dual-wire welding torch 1 according to FIG. 1 designed for connection to a corresponding hose package 6. In this view of the dual-wire welding torch, one can see the end 32 of the dual-wire welding torch 1 constructed to be substantially round and the connection 5 for connection to a hose package 6 (cf. FIG. 1). The connection 5 contains the electric connections for transmitting the welding current to the contact tubes 9, 10 carrying the welding wires 2, 3, supply lines and discharge lines for a cooling fluid, control lines and connections for transferring a protective gas.

[0035] The individual components can be seen better from the exploded illustration of the dual-wire welding torch 1 according to FIG. 3. In this illustration, the important components of the dual-wire welding torch 1 in question can be seen. Accordingly, at the end 31 facing the gas nozzle, which end preferably has a rectangular cross section, the torch body 4 has two interfaces 12, 13 for accommodating two nozzle assembly receptacles 14, 15, which nozzle assembly receptacles are constructed to be replaceable as inserts. The nozzle assembly receptacles 14, 15 can for example be connected to the interfaces 12 or 13 by means of screws 21. The nozzle assembly receptacles 14, 15 respectively have an opening 16, 17 for the accommodation of a nozzle assembly 7, 8, which openings 16, 17 are arranged at an angle α to one another of between 0 and 20°. If the nozzle assemblies 7, 8 and the contact tubes 9, 10 which can be connected thereto are arranged in the corresponding openings 16, 17 of the nozzle assembly receptacles 14, 15, then the central axes a, b of the contact tubes 9, 10 or the welding wires 2, 3 running therein enclose this angle α (cf. FIG. 4). Although asymmetric designs are conceivable, in which the angles of the openings 16, 17 of the two nozzle assembly receptacles 14, 15 can be constructed differently, a symmetrical arrangement, in which the openings 16, of both nozzle assembly receptacles 14, 15 are orientated symmetrically to an angle bisector, is conventional. As a result, the nozzle assembly receptacles 14, 15 can theoretically be produced identically and merely arranged mirror-inverted to the interfaces 12 and 13. In the symmetrical arrangement, both openings 16, 17 of the nozzle assembly receptacles 14, 15 have half the angle α/2 to the angle bisector.

[0036] Thus, by means of the mere exchange of a pair of nozzle assembly receptacles 14, 15, a novel dual-wire welding torch 1 can be created, with a different angle α of the central axes of the contact tubes 9, 10 or the welding wires 2, 3 running therein to one another. Conventional angles are 0°, 4°, 8° and 11.5°.

[0037] Preferably, both a connection 18 for the feed of a cooling fluid and a connection 19 for the drainage of the cooling fluid are arranged at the end 31 of the torch body 4, which preferably has a rectangular cross section. The connections 18, 19 are in this case substantially above one another and to the side of the interfaces 12, 13. The end 31 of the torch body with a preferably rectangular cross section therefore has the two interfaces 12, 13 and a region for the connections 18, 19 of the cooling fluid. A cooling channel 20 arranged in the gas nozzle 11 is supplied with the cooling fluid by means of the connections 18, 19 and correspondingly connected to one another in a detachable manner. To this end, the connections 18, 19 have corresponding seals and/or what is known as a fluid stopper (not illustrated), so that when the connection is detached, that is to say when the gas nozzle 11 is removed from the torch body 4, an escape of the cooling fluid is prevented. An optimum cooling of the gas nozzle 11 may take place in this manner. If, in addition, the nozzle assembly receptacles 14, 15 and possibly the nozzle assemblies 7, 8 have cooling channels 33, 34, these components can also be cooled optimally (cf. FIG. 5 to this end).

[0038] As already mentioned previously, the gas nozzle 11 can be constructed in two pieces and comprise a gas nozzle mouthpiece 29 and a gas nozzle base body 28, which can be connected to one another in a detachable manner by means of a wire clip 30. In this manner, the quicker wearing gas nozzle mouthpiece 29 can be replaced separately from the gas nozzle base body 28. The gas nozzle 11 is preferably connected to the torch body 4 without tools by means of a pivotable fixing clip 27. The fixing clip 27 is in this case fastened to the end 31 of the torch body with the preferably rectangular cross section in such a manner that it can be pivoted about the rotational axis X. For fixing, the gas nozzle 11 has corresponding projections 35 on both sides, which correspondingly hold or enclose the fixing clip 27 in the fixed position.

[0039] To achieve the desired seal tightness both for the flowing protective gas and the possible cooling fluid, O-rings 22 are arranged on various components, particularly the nozzle assemblies 7, 8.

[0040] For the optimum dispersion of a protective gas, a gas dispenser 23 with two openings 24, 25 for accommodating the nozzle assemblies 7, 8 may be provided. The gas dispenser 23, which is preferably formed from a suitable temperature-resistant plastic material, has corresponding holes 26 for the dispersion of the protective gas. The two openings 24, 25 are orientated at an angle α to one another in accordance with the nozzle assembly receptacles 14, 15. Thus, when using a gas dispenser 23, this can also be provided and, if appropriate, fastened for various angles α.

[0041] FIG. 4 shows a sectional image through a part of the front end 31 of the dual-wire welding torch 1. In this cutaway illustration of the end of the dual-wire welding torch 1, the openings 16, 17 in the nozzle assembly receptacles 14, 15, which are arranged at an angle, can correspondingly be seen.

[0042] FIG. 5 shows a sectional image of the front end 31 of the dual-wire welding torch 1. In this sectional image, one can see a possible cooling channel 33 in the nozzle assembly receptacle 14 and a possible cooling channel 34 in the nozzle assembly 7. According to a preferred design variant, the cooling channel 33 in the nozzle assembly receptacle 14 has a feed 36 and a return 37, which are preferably arranged oppositely and essentially constructed as a bore. The feed 36 and the return 37 are connected to one another by means of a circumferential channel 38 in the opening 16 of the nozzle assembly receptacle 14. The nozzle assembly 7, which is arranged in the opening 16 of the nozzle assembly receptacle 14, has a groove 39 corresponding to this circumferential channel 38 for conveying the cooling fluid, which groove 27 forms the cooling channel 34 in the nozzle assembly 7. The nozzle assembly receptacle 15 and the nozzle assembly 8 are built identically. The cooling fluid runs for example from the connection 18 through the cooling channel 20 in the gas nozzle 11, subsequently through the cooling channel 33 in the nozzle assembly receptacle 15 and the nozzle assembly 8 and thereafter through the cooling channel 33 in the nozzle assembly receptacle 14 and the nozzle assembly 7, before the cooling fluid is returned via the connection 19 at the end of the torch body 4. Therefore, it is possible to speak here of cooling in series, wherein preferably the hottest component is cooled first and after that the further components are cooled. In many cases, the hottest component is the nozzle assembly receptacle at the front as viewed in the welding direction. Depending on the use, the gas nozzle 11 may of course also be the hottest component.

[0043] FIGS. 6A to 6D show various embodiments of the nozzle assembly receptacles 14, 15 and gas dispenser 23 according to the invention for various angles α of the openings 16, 17 of the nozzle assembly receptacles 14, 15 to one another. Various designs of the dual-wire welding torch 1 are illustrated here. In the variant according to FIG. 6A, the nozzle assembly receptacles 14, 15 and the gas dispenser 23 are configured in such a manner that the two contact tubes 9, 10 are arranged parallel to one another, that is to say enclose an angle of 0°. In the variant according to FIG. 6B, the contact tubes 9, 10 or the welding wires 2, 3 running therein enclose an angle of 4°. In the version according to FIG. 6C, the contact tubes 9, 10 enclose an angle of α=8°, in the variant according to FIG. 6D an angle of α=11.5°. However, by means of corresponding production and shaping of the nozzle assembly receptacles 14, 15 and the possible gas dispenser 23, further angles may also be realized, which could be advantageous for certain welding methods, which are executed using the welding torch 1.