DE10107036C1 - Welding torch used in welding operations comprises a burner body with a base body having a device for receiving a gas nozzle - Google Patents

Abstract

Welding torch comprises a torch holder (27) and a body (28) having a base body (29) with bores and/or holding devices for guiding a gas, an electrode and/or a welding wire. The base body has a device (31) for receiving a gas nozzle (32). The device is formed as a spring ring (33) and has a conical outer surface. Preferred Features: The spring ring has a cylindrical inner surface with a slit running over the whole surface. The ring is vulcanized in a plastic ring placed or vulcanized on the base body.

Description

The invention relates to a torch, in particular a welding torch, as in the Oberbe handle of claim 1 is described.

Torches, in particular welding torches, are already known in which the gas nozzle is in a simple form is plugged directly onto a base body. There are also burners knows, in which a means for receiving the gas nozzle is arranged on the base body, where in this case again a play-free or rigid coupling or connection to the gas nozzle is created. The disadvantage here is that there is no freedom of movement for the expansion voltage of the base body is present, so that if the burner is heated too strongly, one of the Art great pressure from the body and the means for receiving the gas nozzle on the gas nozzle is exerted, so that the gas nozzle is destroyed. With such burners is usually only possible for a limited period of time.  

Furthermore, DE 93 13 891 U1 describes a welding gun for inert gas welding with a Gas nozzle head for supplying a welding electrode and protective gas known, the Gas nozzle head from a gas nozzle holder and a gas nozzle detachably attached to it stands. The gas nozzle is with an internal thread and the gas nozzle holder with an ent speaking external thread, whereby the gas nozzle with the gas nozzle holder up ver to abut abutment surfaces on the gas nozzle and the gas nozzle receptacle screws and can be connected to each other.

DE 84 11 792 U1 describes a torch for MIG / MAG inert gas welding with an egg a torch neck with a nozzle assembly screwed or soldered onto its front end, known. The burner has an iso which surrounds the nozzle assembly and is closely adjacent to it lierhülse made of electrically insulating material and a tightly fitting to the insulating sleeve tubular gas nozzle, which is a current nozzle screwed into the nozzle assembly at a distance gives up. The insulating sleeve has an internal thread which is connected to an external thread of the Nozzle block is screwed on. For the axial fixation of the gas nozzle on the insulating sleeve is a Circlip provided in an outer groove of the insulating sleeve and in an inner groove of the gas sleeve engages.

A disadvantage of the above-mentioned writings is that, as already mentioned, by backlash-free or rigid connection of the gas nozzle to the base body in the event of excessive heating the burner large mechanical loads are exerted on the gas nozzle, which up can lead to the destruction of the gas nozzle.

From US 3,230,342 A is a welding gun with a base body and a means for the axial feeding of welding wire to the front end of the welding gun and with Means for supplying protective gas to the front end of the welding gun are known, wherein at the front of the welding gun a cylindrical ring with an inner surface and a cylindrical gas nozzle which has a base which fits into the cylindrical ring, is arranged. The cylindrical ring is made of an elastic metal, has a slot and forms an integrated fastener, which the gas nozzle through radial friction. The cylindrical ring is sweat in the main body gun screwed. The disadvantage here is that it is due to the slotted design of the zylin drische ring when heated to a non-uniform expansion of the cylindrical Ring comes and therefore no secure mounting of the gas nozzle can be guaranteed, d. H. that the gas nozzle slightly change its position to the cylindrical ring when heated can and this can have a negative impact on the welding quality.

The invention has for its object a torch, in particular a welding torch ner, to create, in which a simple construction of the burner and a long service life is enough.

This object of the invention is achieved in such a way that the means for receiving the gas nozzle is formed by a spring ring, the outer surface of which has a conical shape. benefit is in this case that it creates the possibility that the individual parts Can expand heating differently. This enables the various Most parts different materials can be used, the operating time or the stability is improved. A major advantage is that due to the conical shape of the outer surface of the spring washer, the Gas nozzle is made possible because it only has to be pushed onto the spring ring, whereby a clamp or plug connection can be made. With this a Befe Stigung the gas nozzle can be produced inexpensively without much effort.

Further advantageous measures are described in claims 2 to 15. Which are presented resulting advantages can be found in the description.

The invention is subsequently described in more detail by means of exemplary embodiments.

Show it:

Figure 1 is a schematic representation of a welding machine or a Schweissä tes.

Fig. 2 is a diagrammatic construction of an assembled burner, in a simplified schematic representation;

Figure 3 is a side view of the spring ring for the burner, cut and in simplified simplified schematic representation.

Fig. 4 is a plan view of the spring ring for the burner, in a simplified, schematic representation.

As an introduction, it should be noted that in the differently described embodiments  Identify the same parts with the same reference numerals or the same component names the, the disclosures contained in the entire description on the same che parts with the same reference numerals or the same component names that can. The location information selected in the description, such as. B. above, un th, laterally, etc. related to the immediately described and illustrated figure and are in the event of a change in position, to be transferred to the new position. Furthermore, also Individual features or combinations of features from those shown and described below Different embodiments for independent, inventive or fictional represent reasonable solutions.

In Fig. 1, a welding device 1 or a welding system for various processes or procedures, such as. B. MIG / MAG welding or TIG / TIG welding or electrode welding, double wire / tandem welding, plasma or soldering, etc., shown. Of course, it is possible that the solution according to the invention can be used with a current source or a welding current source.

The welding device 1 comprises a current source 2 with a power unit 3 , a Steuerervor device 4 and a switching element 5 assigned to the power unit 3 or the control device 4 . The switching element 5 or the control device 4 is connected to a control valve 6 , which in a supply line 7 for a gas 8 , in particular a protective gas, such as CO ₂ , helium or argon and the like, between a gas storage device 9 and a burner 10 or a welding torch is arranged.

In addition, a wire feed device 11 , which is common for MIG / MAG welding, can also be controlled via the control device 4 , an additional material or a welding wire 13 being fed from a supply drum 14 into the area of the torch 10 via a supply line 12 . Of course, it is possible that the wire feeder advises 11 , as is known from the prior art, in the welding device 1 , in particular in the basic housing, and is not, as shown in Fig. 1, designed as an additional device.

It is also possible for the wire feed device 11 to feed the welding wire 13 or the additional material outside the torch 10 or the welding torch to the process point, with a non-melting electrode preferably being arranged in the torch 10 , as is the case with the TIG / TIG Welding is common.

The current for establishing an arc 15 , in particular a working arc, between the welding wire 13 or the non-melting electrode and a workpiece 16 is via a welding line 17 from the power section 3 of the power source 2 to the torch 10 , in particular the welding wire 13 or the electrode , supplied, wherein the workpiece 16 to be welded is also connected via a further welding line 18 to the welding device 1 , in particular to the power source 2 , and thus a circuit can be set up for a process via the arc 15 .

For cooling of the burner 10, the burner 10 may be a cooling circuit 19 by Zvi's circuit of a flow control 20 with a liquid container, in particular a water container 21 are connected, whereby upon starting the burner 10 of the cooling circuit 19, in particular one of which is arranged in the water tank 21 Liquid speed used liquid pump is started and thus cooling of the torch 10 or the welding wire 13 can be effected.

The welding device 1 also has an input and / or output device 22 , by means of which the most varied welding parameters, operating modes or welding programs of the welding device 1 can be set or called up. The welding parameters, operating modes or welding programs set via the input and / or output device 22 are forwarded to the control device 4 and the individual components of the welding system or the welding device 1 are then controlled by the latter.

Furthermore, in the exemplary embodiment shown, the torch 10 is connected to the welding device 1 or the welding system via a hose package 23 . The individual lines from the welding device 1 to the torch 10 are arranged in the hose package 23 . The hose package 23 is connected to the burner 10 via a connecting device 24 which is part of the prior art, whereas the individual lines in the hose package 23 are connected to the individual contacts of the welding device 1 via connecting sockets or plug connections. So that a corresponding strain relief of the hose package 23 is ensured, the hose package 23 is connected via a strain relief device 25 to a housing 26 , in particular to the base housing of the welding device 1 .

Basically it should be mentioned that for the different welding processes or Welding devices, such as TIG devices or MIG / MAG devices or plasma devices not all of the components mentioned above need to be used.  

In Figs. 2 through 4 is a greatly simplified construction of the torch 10 is shown, in which the burner 10 is formed from a commercially available TIG torch.

The burner 10 is formed, for example, from a burner holder 27 or a burner handle and a burner body 28 . A base body 29 is arranged in the burner body 28 and can be made in one or more parts. The base body 29 has bores and / or holding means, not shown, for guiding at least one supplied gas 8 and one supplied melting welding wire 13 or an inserted non-melting electrode 30 . In the exemplary embodiment shown, a non-melting electrode 30 is used , as indicated schematically. Furthermore, a means 31 disposed on the base body 29 or on the torch body 28 for receiving a gas nozzle 32, so that the gas nozzle 32 may be positioned on the base body 29 or on the torch body 28 and attached.

The means 31 for receiving the gas nozzle 32 is formed by a spring ring 33 , the outer surface 34 of which has a conical shape. This makes it possible that the gas nozzle 32 can be pushed over the spring ring 33 in a simple form and thus a so-called clamp or plug connection between the burner 10 and the gas nozzle 32 is Herge, the spring action of the spring ring 33 is maintained. Due to the conical shape of the outer surface 34 of the spring ring 33 , a very simple structure of the burner 10 is achieved, since the burner 10 or the base body 29 without additional attachment elements or limiting elements or holding element for the positioning and fastening of the gas nozzle 32 on the burner body 28 or can be formed on the base body 29 . The conical shape of the spring washer 33 prevents the gas nozzle 32 from being pushed too far or pushed over a defined position, so that repeated placement of the gas nozzle 32 always or approximately achieves the same position. For this purpose, it is also possible that the spring ring 33 in the end region or a not shown Before jump, comprising for positioning the gas nozzle 29, that is a stop element, that the Gasdü se is slid onto the spring ring 33 29 and on the stop element or before the jump comes to rest, so that the spring function of the spring ring 33 is not restricted.

The spring ring 33 is preferably constructed in such a way that the spring ring 33 has an inner surface 35 which has a cylindrical shape. This enables simple positioning or attachment to the base body 29 or to the burner body 28 . The spring ring 33 is in the embodiment shown in a groove 36 of the body 29 inserted or up. The cylindrical shape of the inner surface 35 ensures that a simple position Her the groove 36 for the spring ring 33 is made possible. An outer diameter 37 of the groove 36 is formed such that it is slightly smaller than an inner diameter 38 of the spring ring 33 , so that a corresponding play for the spring ring 33 , that is, a space between the spring ring 33 and the base body 29 is created. For example, the outer diameter 37 of the groove 36 is between 1% and 20%, preferably 10% smaller than the inner diameter 38 of the spring ring 33 . Furthermore, it is possible that the spring ring 33 in a plugged onto the base body 29 or vulcanized plastic ring, not shown, is vulcanized, so that a common unit with the plastic ring will create ge, the plastic ring is attached to the base body 29 and again a corresponding game to the base body 29 for the spring ring 33 is formed.

The spring washer 33 has, for example, a slot 40 which extends over an entire width 39 , as a result of which the spring washer 33 can be appropriately expanded and springed. The slot 40 of the spring ring 33 has a width 41 between 0.2 mm and 1 mm, preferably 0.6 mm. Furthermore, the spring ring 33 has an inner diameter 38 between 9 mm and 30 mm, preferably 11 mm. At its narrowest point in the conical shape, that is to say the outer surface 34 , the spring ring 33 has an outer diameter 42 of between 10 mm and 27 mm, preferably 13 mm, the conical shape of the outer surface 34 having an angle 43 of between 2 ° and 5 °, preferably 3 ° having.

It is essential in the inventive solution, that the spring ring 33, the gas nozzle 32 at distances deferred gas nozzle 32 from the base body 29, 32 so that the gas nozzle does not come directly into abutment on the base body 29th This is necessary insofar as the base body 29 , in particular the end region of the base body 29 , and the gas nozzle 32 are made from different materials. The gas nozzle 32 is preferably made of ceramic and the base body 29 made of copper or a copper alloy or another electrically conductive material. Due to the different materials, different dimensions of the materials are achieved with increasing heating of the individual parts, as is the case with a welding process.

By mounting or attaching the gas nozzle 32 via the spring ring 33 on the base body 29 , it is possible that a corresponding freedom of movement for the base body 29 will create ge, so that when the individual parts are heated, the different expansion behavior of the different materials for the base body 29 and the Gas nozzle 32 can be compensated. That is, it is possible that the base body 29 can expand more than the gas nozzle 32 without the gas nozzle 32 being destroyed.

If the gas nozzle 32 were attached without play or directly to the base body 29 or if it comes into contact with the base body 29 , as is known from the prior art, it can happen that due to the greater coefficient of thermal expansion of the material of the base body 29, this exerts such a high pressure against the gas nozzle 32 that it is destroyed, ie that the base body 29 expands further than is permitted for the ceramic gas nozzle 32 , so that it will shatter in the area of the base body 29 . To prevent this, the manufacturers only guarantee a limited operating time for the burners 10 known from the prior art.

However, since in the solution according to the invention the gas nozzle 32 is held on the spring ring 33 with a corresponding play or freedom of movement on the base body 29 , the base body 29 can expand to a certain extent without the gas nozzle 32 being damaged. This has the advantageous effect that the service life and the operating time of the burner 10 or the gas nozzle 32 are substantially increased. This is particularly important in the case of air-cooled burners 10 , as can be seen in the exemplary embodiment shown, since in these systems the cooling in the region of the gas nozzle 32 cannot be influenced. Another advantage of such a plug-in system is that the wear of the ceramic gas nozzle 32 can be reduced, since longer grinding points are avoided when the gas nozzle 32 is plugged onto the burner 10 . Since the outer surface 34 of the spring ring 33 has a conical shape, the manufacturing tolerances of the gas nozzle 32 no longer play any role, since the gas nozzle 32 is pushed onto contact with the angularly extending outer surface 34 or a stop element, not shown, and thus always a secure attachment is achieved, whereby the manufacturing costs of the gas nozzle 32 can be significantly reduced.

Of course, it is possible that the spring washer 33 can be constructed from several individual parts, in particular from a plurality of individual spring washers, this again forming a conical, similar shape. It is also possible that further parts or construction groups of the torch 10 or the welding system can be fastened with a spring ring 33 , the outer surface 34 of which has a conical shape. This is particularly important when individual parts or assemblies made of different materials with different expansion coefficients are to be connected. Furthermore, it is possible that the inner surface 35 of the spring ring 33 is formed parallel to the outer surface 34 , that is to say also has a conical shape.

In conclusion, it should be pointed out that in the exemplary embodiments described above individual states or representations were presented disproportionately to the understanding to improve the solution according to the invention. Furthermore, individual states can also or representations of the previously described combinations of features of the individual versions Examples in connection with other individual features from other execution examples play, form independent, inventive solutions.  

REFERENCE NUMBERS

1

welding machine

2

power source

3

power unit

4

control device

5

switchover

6

control valve

7

supply line

8th

gas

9

gas storage

10

burner

11

Wire feeder

12

supply line

13

welding wire

14

storage drum

15

Electric arc

16

workpiece

17

welding cable

18

welding cable

19

Cooling circuit

20

flow Switch

21

water tank

22

Input and / or output device

23

hosepack

24

connecting device

25

strain relief

26

casing

27

torch holder

28

torch body

29

body

30

electrode

31

medium

32

gas nozzle

33

spring washer

34

outer surface

35

Inner surface

36

groove

37

outer diameter

38

Inner diameter

39

width

40

slot

41

width

42

outer diameter

43

angle

Claims (15)

1. welding torch, which is formed from a torch holder or torch handle and a torch body, a base body being arranged in the torch body, the bores and / or holding means for guiding at least one supplied gas and one supplied melting or non-melting electrode or one Welding wire, and that a means for receiving a gas nozzle is arranged on the base body, characterized in that the means ( 31 ) for receiving the gas nozzle ( 32 ) is formed by a spring ring ( 33 ), the outer surface ( 34 ) of which is conical in shape having. 2. Welding torch according to claim 1, characterized in that the spring ring ( 33 ) has an inner surface ( 35 ) which preferably has a cylindrical shape. 3. A welding torch according to claim 1 or 2, characterized in that the Fe derring ( 33 ) has a slot ( 41 ) extending over the entire width ( 39 ). 4. Welding torch according to one or more of the preceding claims, characterized in that the spring ring ( 33 ) is inserted or plugged into a groove ( 36 ) of the base body ( 29 ). 5. Welding torch according to one or more of the preceding claims, characterized in that the spring ring ( 33 ) in a on the base body ( 29 ) is vulcanized plugged or vulcanized plastic ring. 6. Welding torch according to one or more of the preceding claims, characterized in that the gas nozzle ( 32 ) on the base body ( 29 ) arranged Fe derring ( 33 ) can be plugged. 7. Welding torch according to one or more of the preceding claims, characterized in that the conical shape of the outer surface ( 34 ) of the spring ring ( 33 ) has an angle ( 43 ) between 1 ° and 5 °, preferably 3 °. 8. Welding torch according to one or more of the preceding claims, characterized in that the slot ( 40 ) of the spring ring ( 33 ) has a width ( 41 ) between 0.2 mm and 1 mm, preferably 0.6 mm. 9. Welding torch according to one or more of the preceding claims, characterized in that the spring ring ( 33 ) has an inner diameter ( 38 ) between 9 mm and 15 mm, preferably 11 mm. 10. Welding torch according to one or more of the preceding claims, characterized in that the spring ring ( 33 ) has an outer diameter ( 42 ) between 10 mm and 17 mm, preferably 13 mm, at its narrowest point of the conical shape. 11. Welding torch according to one or more of the preceding claims, by in that the spring ring distances (33) when plugged gas nozzle (32) the gas nozzle (32) of the base body (29) or the torch body (28). 12. A welding torch according to one or more of the preceding claims, characterized in that the gas nozzle ( 32 ) is made of ceramic and the base body ( 29 ) is made of copper or a copper alloy or another electrically conductive material. 13. Welding torch according to one or more of the preceding claims, characterized in that an outer diameter ( 37 ) of the groove ( 36 ) is designed such that it is slightly smaller than the inner diameter ( 38 ) of the spring ring ( 33 ). 14. Welding torch according to one or more of the preceding claims 1- 12, characterized in that the outer diameter ( 37 ) of the groove ( 36 ) is between 1% and 20%, preferably 10% smaller than the inner diameter ( 38 ) of the spring ring ( 33 ) , 15. Welding torch according to one or more of the preceding claims, characterized in that the spring ring ( 33 ) has a stop element or a projection for the positioning of the gas nozzle ( 32 ) in the end region.