JPH08309546A - Torch nozzle and nozzle of gas shield arc welding machine - Google Patents

Abstract

PURPOSE: To reduce the amount of spatters deposited on a torch nozzle with a simple structure. CONSTITUTION: A torch nozzle 19 is used for a torch 5 to execute arc-welding in a shield gas atmosphere with a wire supplied continuously from a wire supporting part 46 extending in one direction. This torch nozzle 19 is provided with a nozzle adapter 21 and an air blow nozzle 22. The nozzle adapter 21 is attached to the top end of the torch 5. The air blow nozzle 22 is fixed to the nozzle adapter 21, and consists of a carbon cylindrical member arranged around the wire supporting part 46.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torch nozzle, and more particularly to a nozzle used in a gas shielded arc welding machine torch for performing arc welding in a shield gas atmosphere.

[0002]

2. Description of the Related Art In a gas shielded arc welding method in which arc welding is performed in a shield gas atmosphere such as an inert gas or carbon dioxide gas, a wire support portion for supporting an electrode wire as a filler material and a shield around the support portion are used. A torch provided with a nozzle for ejecting gas is used. In the gas shielded arc welding method, an arc is generated between the electrode wire and the base material, the electrode wire is melted by the heat of the arc, and the molten metal is added to perform welding. During welding, the shield gas supplied from the shield gas supply unit comes out between the nozzle and the wire support unit and wraps the arc and the molten metal. As a result, oxidation or nitridation of the molten metal does not occur.

As a torch used in this type of gas shielded arc welding method, one disclosed in JP-A-5-169269 is known. In this welding machine torch, a water-cooling covering member is provided around the wire supporting portion to cool the wire supporting portion to prevent spatter from adhering to the wire supporting portion. Further, a gas supply unit capable of supplying air for removing spatter is provided at the tip of the torch to blow off the spatter attached to each member of the torch.

[0004]

In the above-mentioned conventional torch, by cooling the covering member arranged around the wire supporting portion, it becomes difficult for spatter to adhere to the tip of the torch. However, in this configuration, since a jacket for circulating water for cooling the covering member must be provided, the structure of the tip of the torch becomes complicated.

An object of the present invention is to reduce spatter adhesion to the torch nozzle with a simple structure.

[0006]

In the nozzle for a torch according to claim 1, arc welding is performed in a shield gas atmosphere by a wire-shaped filler material continuously supplied from a filler material supporting portion extending in one direction. Used in gas shield arc welding machine torch. This torch nozzle includes a mounting portion and a carbon cylindrical nozzle body. The attachment part is attached to the tip of the torch. It is fixed to the cylindrical nozzle body and the mounting portion, and is arranged around the filler material supporting portion.

In the torch nozzle according to the second aspect, the nozzle body is detachably fixed to the nozzle body and the mounting portion. The torch nozzle according to claim 3 further includes a shock absorbing member formed on the outer periphery of the nozzle body. Claim 4
In the torch nozzle described in (1), the shock absorbing member is made of rubber.

In the torch nozzle according to the fifth aspect, a wear resistant layer is formed on the outer peripheral surface of the nozzle body. The torch nozzle according to claim 6 further includes a fluid passage portion provided outside the attachment portion. In the torch nozzle according to the seventh aspect, the fluid passage portion includes one fluid passage pipe.

The torch nozzle according to claim 8 is used for welding vehicle parts. A torch for a gas shielded arc welding machine according to a ninth aspect includes a filler material support portion, a nozzle, and a shield gas supply portion. The filler material supporting portion extends in one direction and supports the wire-shaped filler material. The nozzle includes a mounting portion mounted on the tip of the torch, and a carbon cylindrical nozzle body fixed to the mounting portion and arranged around the filler material supporting portion. The shield gas supply unit
Shield gas is supplied between the filler material support and the nozzle body.

In the torch for a gas shielded arc welding machine according to the tenth aspect, the nozzle body is detachably fixed to the mounting portion. In the torch for gas shielded arc welding machine according to claim 11, the nozzle further includes an impact absorbing member formed on the outer periphery of the nozzle body.

[0011]

In the torch nozzle according to the first aspect of the present invention, during welding, the filler material supported by the filler material supporting portion is continuously supplied to perform welding. At this time, the molten metal is spattered and scattered. However, since the entire nozzle body is made of carbon, the amount of spatter adhered is reduced.

In the torch nozzle according to the second aspect, since the nozzle body is removable from the mounting portion, cleaning and replacement of the filler material support portion and the nozzle body are facilitated. In the torch nozzle according to claim 3, since the impact absorbing member is formed on the outer periphery of the nozzle body, even if the removed nozzle body is dropped, for example, the nozzle body is less likely to be damaged. .

In the torch nozzle according to the fourth aspect, since the shock absorbing member is made of rubber, the shock is absorbed by the elasticity of the rubber even if the nozzle body is dropped. In the nozzle for torch according to claim 5, since the wear resistant layer is formed on the outer peripheral surface of the nozzle body, the outer peripheral surface of the nozzle body is less likely to be damaged even if high temperature spatter collides during welding. .

In the torch nozzle according to the sixth aspect, the fluid is supplied from the fluid passage portion and moves to the tip side through the space in the nozzle body. Since the fluid passage part is provided outside the attachment part, the amount of passage of the fluid increases,
The spatter adhered to each member is sufficiently removed. In the torch nozzle according to the seventh aspect, since the fluid passage portion is composed of one fluid passage pipe, workability in a narrow space is improved.

The torch nozzle according to the eighth aspect is used for welding vehicle parts and can obtain the above-mentioned excellent action.

[0016]

EXAMPLES In the first embodiment FIG. 1, inert gas shielded arc welding machine 1 in which one embodiment of the present invention is employed mainly from the welding power source 2 and the gas supply device 3 and the wire feeder 4 and the torch 5 which It is configured. This inert gas shielded arc welder 1 is used for welding vehicle parts.

The welding power source 2 is for generating a DC welding current from a three-phase 200V AC power source. The welding power source 2 includes a control unit 10 (described later). A ground electrode 11 is connected to the welding power source 2. The gas supply device 3 includes an argon gas cylinder 6 filled with high-pressure argon gas, a carbon dioxide gas cylinder 7 filled with high-pressure carbon dioxide gas, and a mixing chamber 8 for mixing argon gas and carbon dioxide gas to form a shield gas. It has and. An argon gas flow rate controller 9 is arranged between the argon gas cylinder 6 and the mixing chamber 8. Further, a carbon dioxide gas flow rate regulator 12 is arranged between the carbon dioxide gas cylinder 7 and the mixing chamber 8. A mixing prevention circuit 13 is connected to the mixing chamber 8 via a pipe and a rubber hose. In the mixing prevention circuit 13,
For example, an air source (not shown) including a high-pressure compressor that generates compressed air of 1 MPa is also connected. The mixing prevention circuit 13 is provided to control the air supplied from the air source and the shield gas supplied from the gas supply device 3, and to prevent the air and the shield gas from being mixed. The mixing prevention circuit 13 is connected to the torch 5 via a rubber hose 17. The inside of the mixing prevention circuit 13 will be described in detail later.

The wire supply device 4 includes a wire reel mounting portion 15 for mounting the wire reel 14 around which the welding wire is wound, and a feed roller 1 for supplying the welding wire wound around the wire reel 14 into the torch 5.
6 is provided. The feed roller 16 supplies the welding wire to the torch 5 at a constant speed with respect to the welding speed.

The torch 5 is, as shown in FIGS. 2 and 3,
A coil liner 18 for inserting a welding wire, and a wire support portion 46 fixed to the tip of the coil liner 18.
And a torch nozzle 19 arranged around the wire supporting portion 46. The torch nozzle 19 is arranged concentrically with the wire support portion 46, and forms an annular passage 31 therebetween.

The coil liner 18 is a tubular member which is elongated and has a passage 18a formed in the center thereof. The rubber hose 17 from the aforementioned mixing prevention circuit 13 is connected to the base end of the coil liner 18 and communicates with the passage 18a. The coil liner 18 is curved on the tip side. The wire support portion 46 includes a chip body 25 fixed to the coil liner 18, an insulating cylinder 26 screwed to the outer peripheral side of the base end portion of the chip body 25, and a contact tip screwed to the tip side of the chip body 25. And 27.

The tip body 25 is a cylindrical metal part extending in one direction. The tip body 25 has a passage 2 which communicates with the passage 18a of the coil liner 18 at the center thereof.
5a is formed. The diameter of the passage 25a is larger than the outer diameter of the welding wire (not shown). Eight small holes 25b that connect the passage 25a and the space 31 are formed at the tip of the chip body 25.

The contact tip 27 is a tip body 25.
Is a metal part that extends in the same direction as. The diameter of the outer peripheral surface of the contact tip 27 decreases toward the tip side. The contact tip 27 has a wire hole 27a, which has a diameter substantially the same as the wire diameter and extends in the longitudinal direction of the torch, for inserting a welding wire (not shown) at the center thereof. The wire hole 27a communicates with the passage 25a of the tip body 25, and supports a welding wire (not shown) movably in the extending direction of the tip body 25 and the contact tip 27.

The insulating cylinder 26 is composed of a cylindrical resin portion 29 and a metal portion 30 integrally formed on the outer periphery of the tip side thereof. A screw 29a is formed on the inner peripheral surface of the base end portion of the resin portion 29, and the screw 29a is screwed into a screw 25c formed on the outer peripheral surface of the base end portion of the chip body 25. Also,
A screw 30a is formed on the outer peripheral surface of the metal portion 30,
The screw 21a of the nozzle adapter 21 described later is screwed into the screw 30a. The torch nozzle 19 described later is insulated from the chip body 25 by the resin portion 29 of the insulating cylinder 26.

The torch nozzle 19 has a nozzle adapter 21.
And an air blow nozzle 22 and a carbon head 23. The nozzle adapter 21 is a cylindrical member, and has a first screw 21a formed on the inner peripheral surface of the base end portion and a second screw 21b formed on the inner peripheral surface of the tip end portion. The first screw 21a is screwed onto the screw 30a of the insulating cylinder 26 as described above. The nozzle adapter 21 is integrally formed with one air supply pipe 24. The air supply pipe 24 extends obliquely rearward from the nozzle adapter 21 and is then curved, and extends substantially parallel to the tip end portions of the insulating cylinder 26 and the coil liner 18. A passage 24a is formed in the air supply pipe 24, and a tip end opening portion 24b of the passage 24a opens into the space 31 and is inclined toward the tip body 25 toward the tip end. A joint 24c is formed at the other end of the air supply pipe 24, and a hose 50 connected to the mixing prevention circuit 13 is connected to the joint 24c.

The air blow nozzle 22 is a cylindrical member made of metal, and a screw 22a which is screwed into the second screw 21b of the nozzle adapter 21 is formed on the outer peripheral surface of the base end portion.
Furthermore, in the opening portion on the tip side of the air blow nozzle 22,
A cylindrical carbon head 23 made of carbon with a collar is screwed. The carbon head 23 is arranged so as to cover the inner peripheral surface from the tip of the air blow nozzle 22 to the inner side of the predetermined portion. The inner peripheral side of the tip of the carbon head 23 is a chamfered surface 23a.

The mixing prevention circuit 13, as shown in FIG.
Shield gas on-off valves 39 and 40 for opening and closing the shield gas supplied from the gas supply device 3, and air on-off valves 41 and 42 for opening and closing high pressure air from the compressor, respectively.
It has mixing prevention valves 43 and 44 connected to the air opening / closing valves 41 and 42, respectively. Shield gas on-off valve 39,
40 is, for example, a direct-acting 2-port valve, and the air opening / closing valves 41, 42 are, for example, pilot-type 2-port piston drive valves. The mixing prevention valves 43 and 44 are, for example, 3-port poppet type valves. The shield gas on-off valve 39 and the mixing prevention valve 44 are connected via a rubber hose 17 to an air connection port (not shown) of a passage 18a of the coil liner 18.
It is connected to the. The shield gas on-off valve 40 and the mixing prevention valve 43 are connected to the passage 24 a of the air supply pipe 24 via a rubber hose 50.

The control unit 10 includes a microcomputer including a CPU, ROM, RAM and the like. As shown in FIG. 5, the control unit 10 is connected to the remote controller 20, the feed roller 16, the shield gas on-off valves 39 and 40, the air on-off valves 41 and 42, the mixing prevention valves 43 and 44, and other input / output devices. Has been done. With the above structure, the operator can easily change various operation settings via the remote controller 20.
For example, the welding time per one time, the timing and time for injecting the spatter blowing air after the welding is completed, and the injection timing and time for the preflow gas can be set to optimum values according to the conditions.

Next, the operation of the above embodiment will be described. In this embodiment, spatter is removed every time welding is completed. Specifically, one cycle is welding (shield gas injection) → spatter removal (high pressure air injection) → residual air ejection (shield gas injection). Welding (shield gas injection) During welding, the air on-off valves 41 and 42 are shut off,
The mixing prevention valves 43 and 44 are put into an exhaust state. Then, the shield gas on-off valves 39, 40 are opened, and the passage 24a of the air supply pipe 24 connected to the nozzle adapter 21.
The shield gas is supplied to the passage 18a in the coil liner 18. This shield gas enters the air blow nozzle 22 through the passage 24a and the small hole 25b of the tip body 25, and further moves through the annular space 31 to the tip side.
As a result, the shield gas supplied from the gas supply device 3 is ejected from the tip of the torch nozzle 19. This allows
The molten material is shielded from the air during the welding operation.

As described above, the mixing prevention valve 4 is used during welding.
Since both 3 and 44 are in the exhaust state, the air opening / closing valve 4
Even if air leaks from the valves 1 and 42, the leaked air is exhausted by the mixing prevention valves 43 and 44. As a result, no air is supplied to the torch 5 during welding. If spatter occurs during this welding, part of it tends to adhere to the tip of the air blow nozzle 22, but since the carbon head 23 made of carbon is arranged there, it is difficult for spatter to adhere. Further, since the chamfered surface 23a is formed on the carbon head 23, it is more difficult for spatter to adhere.

When the spatter removal welding is completed, for example, after waiting for the work to move away from the torch 5 for a predetermined time, the air opening / closing valves 41 and 42 are opened and the mixing prevention valves 43 and 44 are opened. Further, the shield gas on-off valves 39 and 40 are shut off. As a result, high-pressure air from the air source is supplied to the passage 24a of the air supply pipe 24 and the passage 18a in the coil liner 18. The air supplied to the air supply port 24 a is the annular space 31 on the inner peripheral side of the air blow nozzle 22.
Is supplied to.

These air blows off the spatter attached to each member. Here, since air is supplied from the outside of the air blow nozzle 22 via the air supply pipe 24,
The air flow rate is high. As a result, the effect of removing spatter is improved. Further, the air supplied from the passage 24a, after hitting the tip body 25, flows in the annular space 31 almost straight to the tip side. In this way, the air moves straight in the annular space 31 without swirling, so the effect of removing spatter is improved. Further, the spatter attached to the chip body 25 is directly blown off.

Further, since air cools each member of the torch 5, spatter is less likely to adhere during the next welding.
Here, since the flow rate of air is large, the cooling degree of each part is improved. Generally, the temperature of each component is preferably about 100 ° C. or lower. If the temperature is 60 ° C., the amount of spatter adhered is greatly reduced. In this embodiment, during continuous operation, the number of times until the temperature of the tip of the air blow nozzle 22 reaches 60 ° C. is higher than in the conventional case. Furthermore, the temperature does not reach 100 ° C. even if it is continuously operated 100 times.

As described above, when the residual amount of adhered spatter is reduced, the frequency of cleaning the nozzle is reduced, and the continuous operation time of the welding machine can be extended. When a predetermined time (about 2 minutes) for expelling air (shield gas injection) has elapsed and the spattering is completed, the shield gas on-off valves 39, 40 are opened and the air on-off valves 41, 42 are shut off. The mixing prevention valves 43 and 44 are turned off. As a result,
The shield gas is supplied to the passage 24a of the air supply pipe 24 and the passage 18a in the coil liner 18. This shield gas is passed through the passage 24a, the annular space 31 and the passage 18a.
The air remaining therein is expelled to the tip side of the torch 5 to create a shield gas atmosphere in the annular space 31. As a result, residual air is not jetted from the tip of the torch 5 at the next welding. Here, since the shield gas for preflow is supplied from the air supply pipe 24, the flow rate is high. Therefore, the residual air can be removed for a short time (about 3
Minutes) will definitely drive you out.

Maintenance In this embodiment, since the air blow nozzle 22 is removable from the nozzle adapter 21, the tip body 25 and the contact tip 27 can be easily cleaned and replaced. Specifically, when the air blow nozzle 22 is removed from the nozzle adapter 21, the tips of the contact tip 27 and the tip body 25 are exposed. In this state, the contact tip 27 can be easily removed. Further, the tip body 25 and the contact tip 27 can be easily cleaned with the attachment.

Others Since the number of the air supply pipe 24 for supplying the air or the shield gas to the annular space 31 in the air blow nozzle 22 is one, the tip of the torch 5 becomes compact and the workability in a narrow space is improved. Further, the air supply pipe 24 extends obliquely rearward from the nozzle adapter 221, then bends, and extends substantially parallel to the insulating cylinder 26 and the coil liner 18 in the vicinity thereof. Therefore, the tip of the torch 5 is more compact. In addition, it is conceivable that the number of the air supply pipes 24 is reduced to one, compared with the case where the number is two or more. However, since the air supplied from the air supply pipe 24 advances straight in the annular space 31 without swirling, the spatter removing effect does not decrease. Second Embodiment In the torch nozzle 19 shown in FIG. 6, the cylindrical air blow nozzle 22 is formed by integrating the air blow nozzle and the carbon head, which are separate bodies in the above embodiment. The air blow nozzle 22 is made of carbon, and a thin rubber layer 51 is formed on the outer peripheral surface thereof. It The screw 22 a of the air blow nozzle 22 is screwed onto the second screw 21 b of the nozzle adapter 21. That is, the air blow nozzle 22 is detachably fixed to the nozzle adapter 21. As a result, the same effect as that of the above embodiment can be obtained.

Further, since the air blow nozzle 22 is an integrated carbon product, the amount of spatter adhered is greatly reduced. The air blow nozzle 22 may be detached from the nozzle adapter 21 and carried. Moreover, since the air blow nozzle is entirely carbon, it is easily damaged when dropped. However, the air blow nozzle 22
Since the rubber layer 51 is formed on the outer periphery of, it is less likely to be damaged. A titanium layer may be formed on the outer peripheral surface of the carbon air blow nozzle integrated with the third embodiment . In this case, the abrasion resistance of the outer peripheral surface of the carbon air blow nozzle is improved. As a result, even if flying spatters collide during welding, the air blow nozzle is less likely to be damaged and the life is extended.

[Modification] (a) In the above embodiment, the spatter is removed every time welding is performed, but the spatter may be removed after performing the welding a plurality of times. Even in this case, the sputter can be sufficiently removed by using the present invention. (B) Although high-pressure air is used as the gas for removing spatter, other gas such as nitrogen gas may be used. (C) In the above embodiment, high-pressure air was supplied into the annular space 31 to blow off the spatters.
The inside may be suctioned to remove the spatter.

[0038]

In the torch nozzle of the present invention, since the entire nozzle body is made of carbon, the amount of spatter adhered is reduced. Since the nozzle body is detachable from the mounting portion, cleaning and replacement of the filler material support portion and the nozzle body become easy.

Since the shock absorbing member is formed on the outer circumference of the nozzle body, even if the removed nozzle body is dropped, the nozzle body is not easily damaged. Since the wear resistant layer is formed on the outer peripheral surface of the nozzle body, the outer peripheral surface of the nozzle body is less likely to be damaged even if high-temperature spatter collides during welding.

For example, the fluid is supplied from the fluid passage portion and moves toward the tip side through the space in the nozzle body. Since the amount of passage of the fluid is large, the spatter attached to each member is sufficiently removed. Since the fluid passage portion is composed of one fluid passage pipe, workability in a narrow space is improved.

The torch nozzle is used for welding vehicle parts and can obtain the above-mentioned excellent effects.

[Brief description of drawings]

FIG. 1 is a side view of an inert gas shielded arc welder adopting a first embodiment of the present invention.

FIG. 2 is a partial sectional view of a torch.

FIG. 3 is a partially enlarged view of FIG.

FIG. 4 is a circuit diagram of a mixing prevention circuit.

FIG. 5 is a block diagram showing a control configuration of the present invention.

FIG. 6 is a partial sectional view of a nozzle according to a second embodiment.

[Explanation of symbols]

 1 Inert gas shield arc welder 5 Torch 18 Coil liner 19 Torch nozzle 21 Nozzle adapter 22 Air blow nozzle 23 Carbon head 24 Air supply pipe 25 Tip body 26 Insulation cylinder 27 Contact tip 46 Wire support

Claims (11)

[Claims] 1. A nozzle used in a gas shielded arc welder torch for performing arc welding in a shield gas atmosphere by a wire-shaped filler material continuously supplied from a filler material supporting portion extending in one direction, comprising: A torch nozzle comprising: an attachment portion attached to the tip of the torch; and a carbon cylindrical nozzle body fixed to the attachment portion and arranged around the filler material support portion. 2. The torch nozzle according to claim 1, wherein the nozzle body is detachably fixed to the mounting portion. 3. The torch nozzle according to claim 1, further comprising a shock absorbing member formed on the outer periphery of the nozzle body. 4. The torch nozzle according to claim 3, wherein the shock absorbing member is made of rubber. 5. The torch nozzle according to claim 1, wherein a wear resistant layer is formed on an outer peripheral surface of the nozzle body. 6. The torch nozzle according to claim 1, further comprising a fluid passage portion provided outside the mounting portion. 7. The torch nozzle according to claim 6, wherein the fluid passage portion comprises one fluid passage pipe. 8. The torch nozzle according to claim 1, wherein the nozzle is used for welding vehicle parts. 9. A filler material support portion extending in one direction to support a wire filler material, an attachment portion attached to the tip of the torch, and a periphery of the filler material support portion fixed to the attachment portion. For a gas shielded arc welder including a nozzle including a carbon-made cylindrical nozzle body arranged and a shield gas supply section for supplying a shield gas between the filler material supporting section and the nozzle body. torch. 10. The torch for a gas shielded arc welder according to claim 9, wherein the nozzle body is detachably fixed to the mounting portion. 11. The torch for a gas shielded arc welder according to claim 9, wherein the nozzle further includes a shock absorbing member formed on an outer periphery of the nozzle body.