JP2000158139A - Welding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a sound arc stability for a long period by installing an adherent removal means on a contact chip side of supply rollers for removing the adherents on a welding wire surface while spraying a gas to it, and arranging a flow inlet and a flow outlet of the gas linearly in a manner to cross a supply route of the welding wire. SOLUTION: A liner 2 is installed to a supply path of a wire 3 in a torch body 1, and a wire guide 7 is installed between supply rollers 6 and the torch body 1. A flow inlet for spraying a gas 4, and a flow outlet 11 for discharging an adherent 5 on the surface of the wire 3 are linearly installed to the torch body 1. Then, a hole 12 with enough dimension for working as a passage of the gas 4 and discharging the adherent 5, is provided to the liner 2. The wire 3 is sequentially fed by the supply rollers 6, passed through the wire guide 7 and the liner 2, and discharged from a contact chip in a nozzle 9. On the way for passing the liner 2, the gas 4 is sprayed to the flow outlet 11 from the flow inlet 10 and the adherent 5 of the wire 3 is discharged at once, so as to prevent accumulation of the wire on the liner 2 and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding apparatus for feeding a welding wire (hereinafter referred to as a wire) to a welding torch (hereinafter referred to as a torch) and performing arc welding.

[0002]

2. Description of the Related Art Conventionally, in a consumable electrode type arc welding using a wire, a deposit on the surface of the wire has hindered the feedability of the wire and the energization of the wire from a contact tip to the wire, thus making the arc unstable. The wire feeding device is provided with a cover that covers the entire spool wound wire, or a lid is placed on the top of the pack wound wire to prevent dust adhering to the surface of the wire.

In the torch cleaning device described in Japanese Patent Application Laid-Open No. 7-124748, air increased in pressure by an air-driven intensifier is introduced from the root of a conduit cable, and is separated from a wire through a welding gas flow path. The accumulated powder was involved and discharged from the tip of the torch.

[0004]

However, the conventional welding apparatus provided with a cover or a lid to prevent dust from adhering to the surface of the wire cannot sufficiently prevent the adhering matter on the surface of the wire. During the repetition, deposits accumulate on the wire feed path and the contact tip, hindering the wire feedability and energizing from the contact tip to the wire,
Since the sound arc stability cannot be maintained for a long time, it is necessary to frequently replace the liner which is a replacement part of the contact tip and the wire feeding path.

On the other hand, the torch cleaning device disclosed in Japanese Patent Application Laid-Open No. 7-124748 is difficult to use during the welding operation because the adherence is discharged from the tip of the torch by using air, and even if the welding operation was performed. Even if air is mixed into the welding gas, blow holes are generated, and the welding quality is significantly deteriorated. In addition, the powder that has been separated from the wire and accumulated may not be guided to the tip of the torch, but may be clogged in the middle. Sex cannot be kept long.

An object of the present invention is to solve the above-mentioned problems and to provide a welding apparatus that maintains a sound arc stability for a long time.

[0007]

In order to solve the above-mentioned problems, as a result of studying the wire feeding path and the deposits on the surface of the wire deposited in the contact tip, most of them are generated on the feeding roller. I found out.

Therefore, in the welding apparatus of the present invention, a deposit removing means for removing deposits on the surface of the welding wire by blowing gas is provided on the contact tip side of the feeding roller, and the feeding route of the welding wire is provided. The gas inlet and outlet are arranged in a straight line so as to cross.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The welding apparatus according to the present invention has the above-described structure, in which a gas is blown linearly from an inlet to an outlet across the welding wire after the welding wire passes through the feed roller. By removing deposits on the surface of the welding wire at a stretch, it is possible to prevent deposits from accumulating on the feed path and the contact tip, thereby preventing the feedability of the welding wire and preventing the contact tip from energizing the welding wire. You can do it.

(Embodiment 1) Embodiment 1
This will be described with reference to FIG. The torch body 1 is provided with a nozzle 9 via a torch holder 8. A contact tip (not shown) is provided in the nozzle 9, and the liner 2 is provided in the wire 3 feeding path in the torch main body 1. A wire guide 7 is provided between the feed roller 6 and the torch main body 1. As an attached matter removing means, an inflow port 10 for blowing the gas 4 to the torch body 1 and an outflow port 11 for discharging the attached matter 5 on the surface of the wire 3 are provided in a straight line. , A hole 12 large enough to discharge the deposit 5 is provided. The gas 4 has the same composition as the shielding gas.

The operation of the above configuration will be described. The wire 3 is sequentially fed by the feed roller 6, passes through the wire guide 7 and the liner 2, and exits from the contact tip in the nozzle 9.
In the course of passing through the liner 2, the gas 4 is blown from an inlet 10 arranged linearly to an outlet 11, and the deposits 5 on the surface of the wire 3 are discharged at a stretch.

In the pulse mig welding apparatus having the above configuration, the welding current was set to 200 A, the welding voltage was set to 23 V, and the welding was repeated using Ar as the shielding gas. A welding wire having a diameter of 1.2 mm was used for 20 kg welding. After that, the arc was stable.

According to such a welding device, after the wire 3 passes through the feed roller 6, the gas 4 is blown so as to cross the fed wire 3, and the attached matter 5 on the surface of the wire 3 is blown at once. Since the gas is discharged to the outlet, the deposits 5 do not accumulate on the liner 2 or the contact tip, and the stability of the sound arc can be maintained for a long time. Further, the gas 4 uses a shielding gas used for welding, so that it is not necessary to particularly provide a separate supply unit. At this time, the pressure of the shielding gas is desirably 0.1 MPa or more.

If the outlet 11 has an area larger than that of the inlet 10, the attached matter 5 blown off from the surface of the wire 3 can be discharged more reliably. When the outlet 11 is disposed closer to the feed roller 6 than the inlet 10, it is possible to prevent the attached matter 5 from being blown off in the feed direction of the wire 3. Also, blowing the gas 4 as soon as the wire 3 passes through the feed roller 6 where most of the deposits 5 are generated can prevent the liner 2 from clogging and remove the deposits 5 more effectively. Can be. In this case, the arc stability was similarly maintained even when compressed air was used as the gas 4. At this time, it is desirable to take measures to prevent compressed air from entering the liner 2 by providing an obstacle in the gap between the liner 2 and the wire 3 or increasing the internal pressure of the liner 2.

(Embodiment 2) Regarding Embodiment 2,
This will be described with reference to FIG. About the structure similar to Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted. In the second embodiment, a gas blowing mechanism 17 having an inflow port 15 and an outflow port 16 is provided between the feed roller 6 and the torch main body 13 separately from the welding torch, as a deposit removing means. It is not necessary to make a hole in the liner 14 as in the first embodiment.

(Embodiment 3) Regarding Embodiment 3,
This will be described with reference to FIG. About the structure similar to Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted. A path for sending the gas 4 from the outlet 21 to the shield gas flow path 24 is provided outside the torch main body 18 as the deposit accumulating means 25, and a portion 23 for accumulating the deposit 5 and the deposit 5 are provided in the middle of the path. A filter 22 for separation is provided.

The operation of the above configuration will be described. Gas 4
Is sprayed on the wire 3 and flows together with the deposit 5 on the surface of the wire 3 to separate the deposit 23 on the surface of the wire 3 removed by the filter 22 from the portion 23 where the deposit 5 on the surface of the wire 3 accumulates. Then, it is sent to the shield gas channel 24.

According to such a welding device, the deposit 5 on the surface of the wire 3 is guided to the accumulation portion 23 by blowing the gas 4, and separated from the deposit 5 by the filter 22. While preventing deposition, the gas 4 is sent to the shielding gas flow path 24 and can be used as a shielding gas.

(Embodiment 4) Investigation of the effect on the wire feed when there is a partial feed resistance increase portion in the liner shows that the effect closer to the torch tip is greater. all right. Therefore, it is considered that even if there is a partial feed resistance increase portion near the feed roller, it does not greatly affect the wire feed, and the following embodiment was performed. I was able to keep.

Embodiment 4 will be described with reference to FIG. About the structure similar to Embodiment 3, the same code | symbol is attached | subjected and description is abbreviate | omitted. The gas 4 passes through an inlet 28 provided in the torch main body 26 and is introduced from the inside of the liner 27, and guides the deposit 5 on the surface of the wire 3 through the outlet 29 to the deposit accumulating means 30.

[0021]

As is apparent from the above description, a deposit removing means for removing deposits on the surface of the welding wire by blowing gas is provided on the contact tip side of the feeding roller, and the feeding of the welding wire is performed. By arranging the gas inlet and outlet linearly across the path, the deposits on the surface of the welding wire are removed at a stretch, and the deposits accumulate on the feed path and contact tip, and the welding wire is fed. Therefore, it is possible to provide a welding device that can maintain a healthy arc stability for a long time because it can prevent the electric current from flowing from the contact tip to the welding wire. Further, since it is not necessary to stop the welding operation, the arc stability can be maintained for a long time without lowering the operation efficiency.

If the outlet is larger than the inlet, the deposits blown off from the surface of the welding wire can be more reliably discharged. In addition, when the outlet is disposed closer to the feed roller than the inlet, it is possible to prevent the attached matter from being blown off in the feed direction of the welding wire. In addition, if the deposit removing means is provided as soon as the welding wire passes through the feed roller, the clogging of the feed path is further reduced,
The deposit can be effectively removed.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a welding device according to a first embodiment of the present invention.

FIG. 2 is an explanatory view of a welding device according to the second embodiment.

FIG. 3 is an explanatory view of a welding device according to the third embodiment.

FIG. 4 is an explanatory view of a welding apparatus according to the fourth embodiment.

[Explanation of symbols]

 Reference Signs List 3 Wire 4 Gas 5 Deposit 6 Feed roller 10, 15, 20, 28 Inlet 11, 16, 21, 29 Outlet 17 Gas blowing mechanism (deposit removal means) 24 Shield gas flow path 25, 30 Deposit accumulation means

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Satoshi Saito 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 3B116 AA07 AB13 AB42 AB53 BB22 4E001 AA03 BB06 LA05 LH01 LH03 MB07

Claims (12)

[Claims] 1. A feed roller for feeding a welding wire to a welding torch, a contact tip provided at a tip of the welding torch, and a deposit removal that removes deposits on a surface of the welding wire by blowing gas. And means,
A welding device provided on the contact tip side of the feed roller, wherein the gas inlet and the gas outlet are arranged substantially linearly across the feed path of the welding wire; 2. The welding apparatus according to claim 1, wherein the outlet has a larger area than the inlet. 3. The welding apparatus according to claim 1, wherein the outlet is located closer to the feed roller than the inlet. 4. The welding apparatus according to claim 1, wherein the attached matter removing means is provided immediately after the welding wire passes through the feed roller. 5. The welding apparatus according to claim 1, wherein the extraneous matter removing means is provided closer to the feed roller than at least an intermediate portion between the feed roller and the contact tip. 6. The welding apparatus according to claim 1, wherein the attached matter removing means is provided separately from the welding torch. 7. The welding apparatus according to claim 1, further comprising a deposit accumulating means for accumulating deposits on the surface of the welding wire removed by the deposit removing means. 8. The welding apparatus according to claim 1, wherein a shielding gas is used as a gas for removing deposits on the surface of the welding wire. 9. The welding apparatus according to claim 1, wherein the gas for removing deposits on the surface of the welding wire is compressed air. 10. The welding apparatus according to claim 1, wherein a gas for removing deposits on the surface of the welding wire is used as a shielding gas. 11. The method according to claim 7, wherein a shield gas is used as a gas for removing the deposits on the surface of the welding wire, and the gas is separated from the deposits by the deposit storage means, and the path is sent to a shield gas flow path. Welding equipment. 12. A feed roller for feeding a welding wire to a welding torch, a contact tip provided at a tip of the welding torch, and a deposit removal for removing deposits on a surface of the welding wire by blowing gas. And a deposit storage means for accumulating the removed deposits, wherein the deposit removal means is provided on the contact tip side of the feed roller and uses the gas as a shielding gas.