JP2003290930A - Welding torch for consumable electrode gas shielded arc welding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the conventional problem that a welding torch is unable to fully shield an arc and molten metal from atmospheric air when welding speed is increased in CO<SB>2</SB>gas shielded arc welding of steel, and is unable to fully shield a molten pool from air with shielding gases when aluminum is an object to be welded. <P>SOLUTION: In the welding torch, a filter is attached around the orifice, with the wire gauze of the filter situated at the tip end of the nozzle. As a result, the shielding gas provided for the tip body passes through the shielding gas jetting port of the tip body and that of the orifice and further through the wire gauze of the filter, and is then supplied from the tip end of the nozzle. Consequently, the shielding gas flowing inside the nozzle is straightened, uniformized in the speed distribution, and elongated in the length of laminar flow of the shielding gas to be supplied from the tip end of the nozzle. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a consumable electrode gas shielded arc welding torch for feeding two consumable electrodes (hereinafter referred to as wires) in one torch for consumable electrode gas shielded arc welding. Regarding improvement.

[0002]

2. Description of the Related Art Conventionally, in the construction of various welded structures,
In order to improve the work efficiency of thin plate high-speed welding or thick plate high welding welding, a consumable electrode gas shielded arc welding method of a two-electrode one-torch type in which two wires are fed from one torch is adopted.

FIG. 1 is a view showing a consumable electrode gas shielded arc welding torch of the conventional two-electrode one-torch type, which is the consumable electrode gas shielded arc torch of Japanese Patent Application No. 2001-051481 filed by the present applicant. is there. In the figure, tip bodies 3 and 4 are attached to torch bodies 1 and 2, respectively, and tip bodies 3 and 4 are insulated by a torch body bottom plate 5 made of an insulating material such as ceramics. The power supply tips 6 and 7 are screwed into the tips of the tip bodies 3 and 4, respectively, to guide the wire to the welding portion and the wire is inscribed in the power supply tips 6 and 7. Through the torch bodies 1 and 2 and the tip bodies 3 and 4, the feeding tip 6,
The currents respectively supplied to 7 are supplied to the wires. Further, the shield gas ejection ports 6a, 7 of the tip bodies 3, 4 are
Orifices 8 and 9 provided with shield gas ejection ports 8a and 9a on the side surfaces are provided around a, respectively. By providing these orifices 8 and 9, the shield gas 10 is supplied with the shield gas jet ports 8 a and 9 a of the orifices 8 and 9.
Since it passes through a, the flow of the shield gas 10 can be further stabilized. Furthermore, the orifice 8,
The chip body 8 is formed by forming 9 with an insulating material.
It insulates between 9 and 9. The nozzle 11 surrounds the chip bodies 8 and 9 and the power supply chips 6 and 7, and the orifices 8 and
Shield gas is ejected from the shield gas ejection ports 8a and 9a of 9 respectively, and the shield gas 10 is emitted from the nozzle tip 11a.
Is supplied. Nozzle 1 for downsizing the welding torch
The shape of 1 is a flat truncated cone shape.

Further, chambers 12 and 13 are provided at portions of the orifices 8 and 9 of the nozzle 11 which are close to the shield gas ejection ports 8a and 9a. These chambers 12, 13
By providing the shield gas 10, since the shield gas 10 ejected from the shield gas ejection ports 8a and 9a of the orifices 8 and 9 temporarily stays in the chambers 12 and 13, respectively, and then flows along the inner wall of the nozzle 11, The flow can be made more stable. However, it has the following problems.

[0005]

The consumable electrode gas shielded arc welding torch of the prior art two-electrode one-torch type shown in FIG. 1 is used for carbon dioxide gas arc welding of steel materials. Insufficient shielding from the atmosphere. Therefore, welding defects such as blowholes occur in the weld metal. Further, when the atmosphere is mixed in the arc, the load of the arc fluctuates, the arc voltage and the arc current change, it becomes impossible to perform stable arc length control, and there is a problem that the welding bead shape is not aligned. It was

Further, when aluminum or aluminum alloy (hereinafter referred to as aluminum) is welded as an object to be welded, in order to perform a cleaning action for removing an oxide film existing on the surface of aluminum, compared with welding of mild steel, It is necessary to shield a wide range. However, in the conventional two-electrode one-torch type consumable electrode gas shielded arc welding torch shown in FIG. 1, a schematic diagram showing the flow of the shield gas 10 supplied from the nozzle tip 11a of the torch of FIG. 2 is shown. As described above, the flow of the shield gas 10 cannot shield a wide range when aluminum is welded as an object to be welded. FIG. 2 shows the nozzle tip 11a of the conventional consumable electrode gas shielded arc welding torch shown in FIG.
It is a schematic diagram showing the flow of the shield gas 10 supplied from the above, and is a view of the nozzle tip 11a seen from a direction perpendicular to the welding direction. 14 and 15 are wire tips. Therefore, when aluminum is welded as the object to be welded, the molten metal entrains air because the shield gas 10 cannot sufficiently shield the molten pool from the air.
There is a problem in that the quality of welding is degraded, such as the occurrence of pore defects such as blowholes.

The material of the orifices 8 and 9 shown in FIG. 1 is ceramic, which is heat-resistant but hard and brittle. Therefore, when the nozzle 11 is cleaned, the orifices 8 and 9 may be dropped and cracked or chipped. Further, the orifices 8 and 9 are also vulnerable to thermal shock and may break when exposed to a sudden temperature change. If the orifices 8 and 9 are cracked or chipped, the flow of the shield gas 10 is disturbed at that portion, and the shielding property is deteriorated.

[0008]

According to a first aspect of the present invention, two tip bodies 3 and 4 each having an axial insertion hole for inserting a wire are provided side by side, and the tip end portions of the tip bodies 3 and 4 are arranged. When the wire is inscribed in the power supply tips 6 and 7, the power supply tips 6 and 7 that supply power to the wire are screwed together, the power supply tips 6 and 7 are surrounded by the nozzle 11, and the chip body 3
4 are provided with orifices 8 and 9 made of an insulating material, which are provided with shield gas outlets 8a and 9a on the side surfaces, around the shield gas outlets 3a and 4a, respectively, and the shields supplied to the chip bodies 3 and 4 are provided. Consumable electrode gas shield arc welding in which the gas 10 is ejected from the tip of the nozzle 11 after passing through the shield gas ejection openings 3a and 4a of the tip bodies 3 and 4 and the shield gas ejection openings 8a and 9a of the orifices 8 and 9. In the torch, a consumable electrode gas shield arc welding torch is provided with a filter 16 provided with a net, a fiber or a non-woven fabric of fibers, around the shield gas ejection ports 8a, 9a of the orifices 8, 9.

According to a second aspect of the present invention, two chip bodies 3 and 4 each having an axial insertion hole for inserting a wire are arranged side by side, and a wire is provided with a feeding chip 6 at the tips of the chip bodies 3 and 4. , 7 for supplying electric power to the wire by inscribing the wires, the power supply tips 6, 7 are surrounded by the nozzle 11, and the tip body 3, 4 is surrounded by the shield gas outlets 3a, 4a. On the side, the shield gas outlet 8
an orifice 8 formed of an insulating material provided with a and 9a,
9 are provided respectively, and the shield gas 10 supplied to the tip bodies 3 and 4 passes through the shield gas outlets 3a and 4a of the tip bodies 3 and 4 and the shield gas outlets 8a and 9a of the orifices 8 and 9, respectively. The above nozzle 11
In a consumable electrode gas shielded arc welding torch ejected from the tip of a wire, a wire mesh 17 and a filter 16 provided with a metal fiber or a non-woven fabric of a metal fiber are provided around the shield gas outlets 8a, 9a of the orifices 8, 9 described above. Electrode gas shield arc welding torch.

According to a third aspect of the present invention, two chip bodies 3 and 4 each having an axial insertion hole for inserting a wire are arranged side by side, and the wire has a power feeding chip 6 at the tips thereof. , 7 are screwed into the power supply tips 6 and 7 for supplying electric power to the wire, the power supply tips 6 and 7 are surrounded by the nozzle 11, and the shield gas 10 supplied to the tip bodies 3 and 4 is In the consumable electrode gas shield arc welding torch that is ejected from the tip of the nozzle 11 after passing through the shield gas ejection ports 3a and 4a of the tip bodies 3 and 4, the shield gas ejection ports 3a and 4a of the tip bodies 3 and 4 are A consumable electrode gas shielded arc welding torch provided with a filter 16 provided with glass fiber, ceramic fiber or alumina fiber having insulation and heat resistance in the periphery.

The invention according to claim 4 is the gas shielded arc of a consumable electrode according to claim 3, wherein the filter 16 is a filter 16 provided with a non-woven fabric of glass fiber, ceramic fiber or alumina fiber having insulation and heat resistance. It is a welding torch.

A fifth aspect of the present invention is the consumable electrode gas shielded arc welding torch according to the third aspect, wherein the filter 16 is a filter 16 made of a porous ceramic having insulation and heat resistance.

The invention according to claim 6 is characterized in that chambers 12 and 13 are provided on the inner wall of the nozzle 11 near the shield gas ejection ports 3a and 4a of the tip bodies 3 and 4, respectively. The consumable electrode gas shield arc welding torch according to Item 3.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described based on examples with reference to the drawings. [Embodiment 1] FIG. 3 is a partial cross-sectional view of a consumable electrode gas shielded arc welding torch of Embodiment 1 of the present invention, and FIG. 4 is a bottom view of the consumable electrode gas shielded arc welding torch of Embodiment 1 of the present invention. FIG. 5 is a diagram as viewed, and FIG. 5 is a diagram showing the filter 16 according to the first embodiment of the present invention. In FIG. 3, the filter 16 is attached so as to surround the orifices 8 and 9, and the wire mesh 17 of the filter 16 shown in FIG.
It is installed so that it is located on the 11a side. Further, the filter 16 has a hole 1 for inserting the orifices 8 and 9.
8 and 19 are provided. Therefore, the tip body 3,
4, the shielding gas 10 supplied to the chip body 3,
4, the shield gas ejection ports 3a, 4a and the orifice 8,
It is supplied from the nozzle tip 11a after passing through the shield gas ejection ports 8a and 9a of 9 and further through the wire net 17 of the filter 16. For the description of the other functions, the same functions as those shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 6 is a schematic diagram showing the flow of the shield gas 10 supplied from the nozzle tip 11a of the consumable electrode gas shielded arc welding torch of the present invention. The nozzle tip is seen from the direction perpendicular to the welding direction. It is the figure which looked at 11a.
In the consumable electrode gas shield arc welding torch of the present invention, by providing the filter 16, the shield gas 10 flowing inside the nozzle 11 is rectified and the velocity distribution becomes uniform. As a result, the laminar flow length of the shield gas 10 supplied from the nozzle tip 11a becomes long. In the figure, the flow of the shield gas 10 has a laminar flow length that is considerably longer than that of the conventional consumable electrode gas shielded arc welding torch shown in FIG. Therefore,
The torch shield property is improved, and even in the case of welding at a high welding speed, the arc and the molten metal can be shielded from the atmosphere, so that the welding quality is improved. Further, since the shield gas 10 can sufficiently shield the molten pool from the atmosphere even for an object to be welded, such as aluminum, which is required to have a high shielding property, the molten metal does not involve the atmosphere, There is no problem of degrading the quality of welding such as generation of pore defects such as blowholes.

The filter 16 shown in FIG. 5 is provided with one wire net 17, but the number of the wire net 17 is not limited to one. Further, the filter 16 may be filled with metal fibers or a non-woven fabric of metal fibers. Further, as the filter 16, a filter 16 made of an insulating net or fibers or a nonwoven fabric of fibers may be used.

[Embodiment 2] A consumable electrode gas shielded arc welding torch according to Embodiment 2 of the present invention has tip bodies 3 and 4.
Instead of providing an orifice around the periphery, the filter 16 is directly provided around the shield gas ejection ports 3a, 4a of the chip bodies 3, 4. In this case, when the filter 16 formed of a conductive material is provided around the shield gas ejection ports 3a and 4a of the chip bodies 3 and 4, a short circuit may occur between the two electrodes in the nozzle 11. . There is no problem in the method of using the two electrodes with the same potential, but there is a problem in the welding method in which the two electrodes are insulated from each other and different voltages are applied to the two electrodes, or different current values are applied. Occurs. In such a case, as the filter 16, instead of using metal fibers, glass fibers, ceramic fibers, alumina fibers having insulating properties and heat resistance, or non-woven fabrics thereof are used. Further, the filter 16 formed of a fibrous material having these insulating properties and heat resistance is formed into a cylindrical shape by a method such as sintering, and the shield gas ejection ports 3a and 4a of the chip bodies 3 and 4 are formed. It may be provided around the. Further, the filter 16 may be formed of porous ceramics and provided around the shield gas ejection ports 3a, 4a of the chip bodies 3, 4.

The consumable electrode gas shielded arc welding torch of Example 2 of the present invention was formed of a fibrous material having insulation and heat resistance instead of providing orifices around the tip bodies 3 and 4. By directly providing the filter 16 around the shield gas outlets 3a, 4a of the tip bodies 3, 4, the shield gas 10 flowing inside the nozzle 11 is rectified and the velocity distribution becomes uniform. As a result, the laminar flow length of the shield gas 10 supplied from the nozzle tip 11a becomes long. Therefore, the shielding property of the torch is improved, and even in the case of welding at a high welding speed, the arc and the molten metal can be shielded from the atmosphere, so that the welding quality is improved. Further, since the shield gas 10 can sufficiently shield the molten pool from the atmosphere even for an object to be welded, such as aluminum, which is required to have a high shielding property, the molten metal does not involve the atmosphere, There is no problem of degrading the quality of welding such as generation of pore defects such as blowholes.

Further, since the filter made of the fibrous material is lightweight and has elasticity, it does not break even if dropped. Further, since it is made of flexible fiber, it does not crack even when subjected to thermal shock.

The consumable electrode gas shielded arc welding torch described above is a two-electrode one-torch type consumable electrode gas-shielded arc welding torch for feeding two wires from one torch. It can also be applied to a torch type consumable electrode gas shielded arc welding torch.

[0021]

Since the present invention is constructed as described above, it has the following effects.

In the consumable electrode gas shielded arc welding torch according to the first embodiment of the present invention, the filter 16 is attached around the orifices 8 and 9 in a state where the wire net 17 of the filter 16 is located on the nozzle tip 11a side. Therefore, the shield gas 10 supplied to the tip bodies 3 and 4 passes through the shield gas outlets 3a and 4a of the tip bodies 3 and 4 and the shield gas outlets 8a and 9a of the orifices 8 and 9,
Further, the nozzle tip 11 is passed through the wire mesh 17 of the filter 16.
supplied from a. As a result, the shield gas 10 flowing inside the nozzle 11 is rectified and the velocity distribution becomes uniform,
The laminar flow length of the shield gas 10 supplied from the nozzle tip 11a becomes long. Therefore, the shielding property of the torch is improved, and even in the case of welding where the welding speed is fast, it becomes possible to shield the arc and the molten metal from the atmosphere,
Welding quality is improved. In addition, the shielding gas 1
Since 0 can sufficiently shield the molten pool from the atmosphere, the molten metal does not entrain the atmosphere, and there is no problem of degrading the welding quality such as generation of pore defects such as blowholes.

The consumable electrode gas shielded arc welding torch of Example 2 of the present invention was formed of a fibrous material having insulation and heat resistance instead of providing orifices around the tip bodies 3 and 4. The filter 16 is provided directly around the shield gas ejection ports 3a, 4a of the chip bodies 3, 4. Therefore, the shielding property of the torch is improved, and even in the case of welding at a high welding speed, the arc and the molten metal can be shielded from the atmosphere, so that the welding quality is improved. Further, since the shield gas 10 can sufficiently shield the molten pool from the atmosphere even for an object to be welded, such as aluminum, which is required to have a high shielding property, the molten metal does not involve the atmosphere, There is no problem of degrading the quality of welding such as generation of pore defects such as blowholes.

Further, since the filter made of the fibrous material is lightweight and has elasticity, it does not break even if dropped. Further, since it is made of flexible fiber, it does not crack even when subjected to thermal shock.

[Brief description of drawings]

FIG. 1 is a view showing a conventional two-electrode one-torch type consumable electrode gas shielded arc welding torch.

FIG. 2 is a schematic diagram showing a flow of a shield gas 10 supplied from a nozzle tip 11a of the conventional consumable electrode gas shielded arc welding torch shown in FIG.

FIG. 3 is a partial cross-sectional view of the consumable electrode gas shielded arc welding torch according to the first embodiment of the present invention.

FIG. 4 is a view of the consumable electrode gas shielded arc welding torch according to the first embodiment of the present invention as seen from below.

FIG. 5 is a diagram showing a filter 16 according to the first embodiment of the present invention.

FIG. 6 is a schematic diagram showing the flow of the shield gas 10 supplied from the nozzle tip 11a of the consumable electrode gas shielded arc welding torch of the present invention.

[Explanation of symbols]

1, 2 torch body 3 chip body 3a Shield gas ejection port of tip body 3 4 chip body 4a Shield gas ejection port of chip body 4 5 Torch body bottom plate 6, 7 Power supply chip 8 orifices 8a Shield gas ejection port of orifice 8 9 orifice 9a Shield gas ejection port of orifice 9 10 Shield gas 11 nozzles 11a Nozzle tip 12 and 13 chambers 14,15 Wire tip 16 filters 17 wire mesh 18 Hole for inserting the orifice 8 19 Hole for inserting the orifice 9

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Akashi Kasaishi             2-11-1, Tagawa, Yodogawa-ku, Osaka-shi, Osaka             Daihen Co., Ltd. F-term (reference) 4E001 LB05 LB06 LH02 LH06 MB01

Claims (6)

[Claims] 1. A power feeding chip for supplying electric power to a wire by arranging two chip bodies each having an axial insertion hole for inserting the wire in parallel, and the wire being inscribed in the power feeding chip at the tip of the chip body. The nozzles were screwed together, surrounded by a nozzle surrounding the power supply tip, and orifices made of an insulating material having a shield gas jet on the side surface were provided around the shield gas jet on the tip body, respectively, and were supplied to the tip body. In a consumable electrode gas shield arc welding torch in which the shield gas passes through the shield gas jet port of the tip body and the shield gas jet port of the orifice and is jetted from the tip of the nozzle, around the shield gas jet port of the orifice. A consumable electrode gas shielded arc welding torch provided with a filter comprising a mesh, fibers or a non-woven fabric of fibers. 2. A power feeding chip for supplying electric power to a wire by arranging two chip bodies each having an insertion hole in the axial direction for inserting the wire in parallel, and the wire being inscribed in the power feeding chip at the tip of the chip body. The nozzles were screwed together, surrounded by a nozzle surrounding the power supply tip, and orifices made of an insulating material having a shield gas jet on the side surface were provided around the shield gas jet on the tip body, respectively, and were supplied to the tip body. In a consumable electrode gas shield arc welding torch in which the shield gas passes through the shield gas jet port of the tip body and the shield gas jet port of the orifice and is jetted from the tip of the nozzle, around the shield gas jet port of the orifice. Consumable electrode gas shielded arc welding torch with a filter equipped with wire mesh, metal fiber or non-woven fabric of metal fiber . 3. A power feeding chip for supplying electric power to a wire by arranging two chip bodies each having an insertion hole in the axial direction for inserting the wire side by side, and the wire being inscribed in the power feeding chip at the tip of the chip body. In a consumable electrode gas shield arc welding torch in which a nozzle surrounds a power supply tip, which is screwed, and the shield gas supplied to the tip body passes through a shield gas ejection port of the tip body and is ejected from the tip of the nozzle. A consumable electrode gas shield arc welding torch provided with a filter provided with glass fiber, ceramic fiber or alumina fiber having insulating properties and heat resistance around the shield gas ejection port of the tip body. 4. The consumable electrode gas shield arc welding torch according to claim 3, wherein the filter is a filter provided with a non-woven fabric of glass fiber, ceramic fiber or alumina fiber having insulation and heat resistance. 5. The consumable electrode gas shield arc welding torch according to claim 3, wherein the filter is a filter made of porous ceramics having insulation and heat resistance. 6. The consumable electrode gas shield arc welding torch according to claim 1, wherein a chamber is provided on each inner wall of the nozzle near the shield gas ejection port of the tip body.