JPH0666874U - Welding torch side shield gas nozzle - Google Patents

Abstract

(57) [Summary] [Purpose] In a side shield gas nozzle that is integrally attached to a welding torch that performs arc welding and injects shield gas from the side of the welding torch, maintenance such as cleaning and replacement can be performed easily and quickly. It can be done and economically lean. A first member 14 that is attached to a welding torch 12 via an attachment portion 18, has a connection port 32 for connecting a shield gas supply hose 30 to the upper end of a substantially cylindrical tubular portion 20, and has a lower end opened. On the other hand, the second member 16 having the upper end opened and the injection port 48 provided at the lower end is detachably connected by the set bolt 52 to configure the side shield gas nozzle 10 as a whole.
The second member 16 can be separated while being attached to the welding torch 12 for cleaning to remove spatter and replacement with a new one.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shield gas nozzle that is integrally attached to a welding torch that performs arc welding and injects a shield gas toward the periphery of a molten pool, and in particular, a side shield gas nozzle that injects a shield gas from the side of the welding torch. It is about.

[0002]

[Prior art]

 In order to obtain a good welding state by suppressing the mixture of harmful atmospheric components in arc welding, a shield gas containing an inert gas such as argon as a component is sprayed around the molten pool heated by the arc, Welding torches that perform welding while shielding the area around the molten pool from the atmosphere have been widely used. The shield gas is usually sprayed from a nozzle for shield gas that is integrally formed with the tip body of the welding torch. Side shield gas nozzles that eject from the side are known.

The side shield gas nozzle 70 shown in FIG. 3 is an example thereof. The side shield gas nozzle 70 has an attachment portion 74 integrally attached to the welding torch 72 and an injection port 76 at a side position of the tip of the welding torch 72. And a tubular portion 78 that is formed so as to be substantially parallel to the welding torch 72. A connection port 82 for connecting a supply hose 80 for supplying a shield gas is provided on one end side of a tubular portion 78 located on the base end side of the welding torch 72, and is supplied from the connection port 82. The shield gas is injected from the injection port 76 toward the tip of the welding torch 72. The side shield torch using the side shield gas nozzle 70 as described above supplies the shield gas to the electrode 88 from the shield gas nozzle 86 provided on the outer peripheral side of the tip body 84 of the welding torch 72 as shown by the dashed line in the figure. Compared to a concentric injection type shield torch, there is less adhesion of spatter near the injection port 76, melting loss and thermal deformation due to arc heating, and it is possible to stably inject the shield gas near the molten pool 90. Therefore, it is effective in suppressing the generation of blowholes.

[0004]

[Problems to be solved by the device]

 However, even with such a side shield gas nozzle, it is not possible to completely prevent the spatter from adhering to the injection port and melting damage, so it is necessary to remove spatter when spatter is piled up and shield gas cannot be jetted well. In addition, if melting or thermal deformation progresses to a certain extent and it becomes impossible to restore the shape, the entire side shield gas nozzle must be replaced with a new one, and it is troublesome to remove it from the welding torch and clean it. At the time of replacement, it was uneconomical to replace even the healthy parts that were not functionally impaired. Further, the mounting portion is adapted to be axially fitted to the welding torch rotatably around the shaft center and fixed by a set bolt or the like, and a new side shield gas nozzle is mounted to the welding torch. Each time, the positional relationship in the circumferential direction with the welding torch changes. For this reason, it is necessary to modify the teaching of the welding robot so that the tubular part does not interfere with surrounding parts each time it is replaced, which is complicated and reduces the operating efficiency of the automatic welding line. Was causing the

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a side shield gas nozzle that can easily and quickly perform maintenance such as cleaning and replacement, and is economically economical. To provide.

[0006]

[Means for Solving the Problems]

 In order to achieve such an object, the gist of the present invention is that a side shield that is integrally attached to a welding torch that performs arc welding and that injects a shield gas from the side of the tip of the welding torch toward the periphery of the molten pool. A gas nozzle, comprising: (a) an attachment portion integrally attached to the welding torch, and an attachment portion that is formed so as to be substantially parallel to the welding torch in an attached state, and at one end located at a base end side of the welding torch. A first member having a tubular portion to which a supply hose for supplying a shielding gas is connected and the other end of which is opened, and (b) a substantially tubular member having an opening at one end and an injection port at the other end. It has a shape, one end of which is detachably connected to the other end of the tubular portion, and the shield gas supplied through the tubular portion is supplied from the injection port to the tip of the welding torch. In that a second member which headed injection.

[0007]

[Effect of action and device]

 In such a side shield gas nozzle of the welding torch, it is integrally attached to the welding torch via the attachment portion, and the shield gas supply hose is connected to one end of the tubular portion located on the base end side of the welding torch. At the same time, a second member having an injection port at the other end is detachably connected to a first member having the other end open on the opposite side to the other end of the tubular portion. As a result, the entire side shielded gas nozzle is constructed. When the arc is welded by being attached to the welding torch and connected to the supply hose, the shield gas supplied from the supply hose through the tubular portion of the first member is applied to the side of the tip of the welding torch. It is injected toward the tip of the welding torch from the above-mentioned injection port located. For this reason, the shield gas injected around the molten pool of arc welding is shielded from the atmosphere, and a good welding condition is obtained.

Here, when the spatter scattered by welding adheres to the second member and the shielding gas cannot be satisfactorily jetted due to the spatter, the second member is separated from the first member for a simple cleaning operation. In addition, it was possible to replace the new second member and attach it to the welding torch when melting damage due to arc heating or thermal deformation progressed to a certain extent and shape restoration became impossible. It may be connected to the first member as it is. Therefore, compared with the conventional product of FIG. 3, which requires the entire side shield gas nozzle to be removed from the welding torch and cleaned or replaced with a new product, cleaning and replacement can be easily and quickly maintained and managed. Even if it is necessary to replace the second member, there is no need to replace the functionally sound first member, which is economical without waste.

Further, since only the second member needs to be attached / detached while the first member is attached to the welding torch, the positional relationship between the tubular portion and the second member with respect to the welding torch does not change. Therefore, it is not necessary to modify the teaching of the welding robot each time the nozzle is attached or detached, unlike the conventional case, and the operation stop time of the welding equipment is shortened to improve the operation efficiency.

[0010]

【Example】

 An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a vertical sectional view of a side shield gas nozzle (hereinafter, simply referred to as side shield gas nozzle) 10 of a welding torch according to an embodiment of the present invention. The side shield gas nozzle 10 is composed of a first member 14 fixed to a welding torch 12 shown by a chain line, and a second member 16 detachably connected to the first member 14 so as to be integrated. There is. The II-II cross section in FIG. 1 is shown in FIG.

The first member 14 includes a substantially cylindrical mounting portion 18 that is integrally mounted on the welding torch 12, and a substantially cylindrical shape that is parallel to the welding torch 12 when mounted on the welding torch 12. The tubular portion 20 having a shape is integrally provided. The mounting portion 18 is provided with a stepped fitting hole 24 that is axially fitted to the tip body 22 of the welding torch 12 having a stepped round shaft shape. An insulating sleeve 26 made of nylon is inserted. Further, a set bolt 28 that can project from the outer peripheral side into the large diameter portion of the fitting hole 24 is screwed into the mounting portion 18, and by tightening the set bolt 28 with respect to the chip body 22, The first member 14 is fixed to the welding torch 12 so as not to move relative to it. It is also possible to provide a plurality of the set bolts 28 described above.

Further, the tubular portion 20 is connected to a supply hose 30 for supplying a shield gas containing an inert gas such as argon as a component to one end located at the base end side of the welding torch 12, that is, the upper end in FIG. The connection port 32 is provided. The connection port 32 includes a base end portion 34 that is slightly inclined with respect to the tubular portion 20 and screwed in an airtight manner, an intermediate portion 36 made of a copper pipe having a predetermined length (for example, about 100 mm), and a supply hose. It is composed of a tip portion 38 to which one end of 30 is joined. In this case, the supply hose 30 is made of resin, but since it is sufficiently separated from the vicinity where arc welding is performed, it is unlikely to be affected by welding heat or heat conduction and there is a risk of thermal deformation. Absent. The inside of the tubular portion 20 communicates with the connection port 32 and forms a shield gas gas passage 40 having a circular cross section and parallel to the welding torch 12, and the other end of the tubular portion 20, that is, The lower end in FIG. 1 extends downward from the mounting portion 18 and is open. Further, at the lower end thereof, a thin-walled cylindrical engagement portion 42 is provided for connecting the second member 16.

The second member 16 has a substantially cylindrical shape bent into a dogleg shape, and one end thereof, that is, the upper end in FIG. 1, is fitted inside the engaging portion 42 of the tubular portion 20. In addition, it is provided with a thin-walled cylindrical engagement protrusion 44 having a length dimension substantially equal to that of the engagement portion 42. A gas passage 46 having a circular cross section is formed inside the second member 16 similarly to the tubular portion 20, and the other end, that is, the lower right end in FIG. The gas passage 46 has the same diameter as the gas passage 40 until it is bent into a dogleg shape, and has a diameter slightly larger than that of the gas passage 40 and continues to the injection port 48 from the middle. The injection port 48 is preset in a positional relationship with each of the above-mentioned parts so that the shield gas can be injected at an angle of about 45 degrees from a predetermined position on the side part of the tip of the welding torch 12 in the mounted state of FIG. In this embodiment, the opening diameter perpendicular to the injection direction is about 12 mm. The engaging projection 44 is fitted inside the engaging portion 42 of the tubular portion 20, both opening edge edges thereof are substantially brought into contact with the step portion, respectively, and the insertion hole is formed from the outer peripheral side of the engaging portion 42. By tightening the set bolt 52 screwed to the engagement protrusion 44 through the second passage 50, the second member 16 is tubular with the upper half of the gas passage 46 connected concentrically with the gas passage 40. It is connected to the shaped portion 20 so as not to rotate relative to the shaft center in the fitting direction.

When arc welding is performed with the side shield gas nozzle 10 configured as described above attached to the welding torch 12 and the supply hose 30 connected, the shield gas supplied from the supply hose 30 is Since the gas is injected from the injection port 48 toward the tip of the welding torch 12 through the gas passage 40 on the first member 14 side and the gas passage 46 on the second member 16 side, the side shield gas nozzle 70 shown in FIG. Similarly to the case, the periphery of the molten pool heated and melted by the arc is shielded from the atmosphere, and harmful atmosphere components are suppressed from melting in the molten pool, and a good welding state can be obtained.

Here, in the side shield gas nozzle 10 of the present embodiment, the second member 16 can be attached to and detached from the first member 14 by tightening and unfastening the set bolt 52. When the second member 16 adheres to the second member 16 and the shield gas cannot be satisfactorily injected, the second member 16 can be separated from the first member 14 to easily perform the cleaning operation. At the same time, when melting and thermal deformation due to arc heating have progressed to a certain extent and the shape cannot be restored, the first member is replaced with a new second member 16 and still attached to the welding torch 12. Connect it to 14. Therefore, maintenance and management such as cleaning and replacement can be performed easily and speedily as compared with the conventional product of FIG. 3 in which the entire side shield gas nozzle 70 must be removed from the welding torch and cleaned or replaced with a new product. At the same time, even if it is necessary to replace the second member 16, there is no need to replace the first member 14 which is not functionally impaired, so that there is no waste and it is economical.

Further, since only the second member 16 needs to be attached / detached while the first member 14 is attached to the welding torch 12, the positional relationship of the tubular portion 20 and the second member 16 with respect to the welding torch 12. Does not change with the attachment and detachment of the second member 16. Therefore, unlike the conventional case, it is not necessary to modify the teaching of the welding robot each time the nozzle is attached and detached, and the operation stop time of the welding equipment is shortened, and the operation efficiency is improved.

Although one embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be implemented in other modes.

For example, in the above-described embodiment, the outer periphery of the engagement protrusion 44 is fitted inside the engagement portion 42 of the tubular portion 20, and the set bolt 52 is tightened to move the second member 16 to the first position. Although the first member 14 and the second member 16 are connected to each other, various other forms can be applied to the first member 14 and the second member 16, for example, for positioning around the axis. It is also possible to provide a key, a key groove, etc., and to make the shapes of the engaging portion 42 and the engaging projection 44 other than the cylindrical shape.

The second member 16 in the above-described embodiment has a substantially tubular shape bent into a dogleg shape, and is welded concentrically with the gas passage 40 of the tubular portion 20 up to the middle of the gas passage 46. The second member 16 has a portion parallel to the torch 12, but corresponds to a portion only on the bent tip side with respect to the tubular portion of the second member 16 having a length up to the bent portion. The members may be connected, or conversely, for the tubular portion having a dimension as short as the mounting portion 18, the portion parallel to the welding torch 12 is longer than the second member 16. The members may be connected, and the division positions of the first member and the second member may be appropriately shifted.

In addition, the injection port 48 of the second member 16 in the above-described embodiment is connected to the predetermined portion following the latter half of the flow passage of the gas passage 46 formed to have a diameter slightly larger than the diameter of the gas passage 40. Although it was formed with a diameter dimension and was set to an injection angle of approximately 45 degrees, the opening diameter dimension and the injection angle can be changed as appropriate, and the opening shape of the injection port 48 is an elliptical or rectangular shape other than a circular shape. It may be present, and is appropriately set according to the injection conditions required for the shield gas.

Further, in the above-described embodiment, the supply hose 30 is connected via the relatively long connection port 32 so that the supply hose 30 is sufficiently separated from the vicinity of the welded portion. It is not always necessary to provide the connection port 32 to connect the 30 and such a configuration is not an essential requirement of the present invention. It may be a cylindrical portion integrally provided with a connection port.

Although not illustrated one by one, the present invention can be implemented in various modified and improved modes based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a side shield gas nozzle of a welding torch according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a perspective view showing an example of a conventional side shield gas nozzle.

[Explanation of symbols]

 10: Side shield gas nozzle of welding torch 12: Welding torch 14: First member 16: Second member 18: Mounting portion 20: Cylindrical portion 30: Supply hose 48: Injection port

Claims (1)

[Scope of utility model registration request] 1. A side shield gas nozzle that is integrally attached to a welding torch for performing arc welding, and injects a shield gas from a side portion of the tip of the welding torch toward the periphery of the molten pool, the side shield gas nozzle being integrated with the welding torch. And a supply hose for supplying the shield gas at one end located on the base end side of the welding torch, which is formed so as to be substantially parallel to the welding torch in the mounted state. A first member having a tubular portion with an opening, and a substantially tubular shape having one end opened and an injection port at the other end, and the one end is attachable to and detachable from the other end of the tubular portion. And a second member for injecting the shield gas supplied through the tubular portion toward the tip of the welding torch from the injection port. Shielding gas nozzle.