JPH0469512B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a gas shield nozzle for welding, and particularly to the removal of flying objects such as spatter.

[Prior art] In welding methods that generate an arc in a gas atmosphere, such as inert gas arc welding and carbon dioxide arc welding, inert gas (inert gas) or carbon dioxide gas is supplied to the welding part from a gas nozzle through which a welding electrode is inserted. , Gas shielding of welding parts is performed.

[Problems to be Solved by the Invention] When upward welding is performed using the above-described welding method, a problem arises in that scattered objects such as spatter fall and enter the nozzle. In particular, the "high-speed rotating arc welding device" proposed by the applicant of the present application
(For example, Japanese Patent Application Laid-Open No. 104684/1984) has a rotating mechanism such as a bearing above the welding electrode, so there is a problem that if spatters or the like enter, it may cause a failure of the rotating mechanism. Furthermore, if a large amount of spatter enters between the electrode and the nozzle, there is a problem that the electrode and nozzle may be short-circuited, causing a failure. This invention was made in order to solve this problem, and aims to provide a gas shield nozzle that prevents flying objects such as spatter from entering the vicinity of the welding electrode, and even if they do, they do not reach above the electrode. That is.

[Means for Solving the Problems] A gas shield nozzle according to the present invention includes a heat-resistant insulating member through which a welding electrode passes, and a heat-resistant insulating member through which the electrode is inserted through the insulating member. a heat-resistant inner nozzle whose opening diameter is about the range of motion around the axis of the electrode; a shielding member for shielding the opening above the insulating member of the inner nozzle; and a shielding member attached to or integral with the lower half of the inner nozzle. The above-mentioned problem can be solved by providing a heat-resistant outer nozzle formed in the form of a heat-resistant outer nozzle, and a gas supply means provided in each of the inner and outer nozzles to supply shielding gas toward the opening on the tip side of each electrode. This is the solution.

According to a preferred embodiment of the present invention, the present invention is applied to a high-speed rotating arc welding device in which the electrode is rotated by a rotation mechanism provided above the shielding member.

[Function] In this invention, the gas shield nozzle has a double structure consisting of an inner nozzle and an outer nozzle,
Of these two nozzles, the inner diameter of the inner nozzle through which the welding electrode is directly inserted is made as narrow as the range of movement around the axis of the electrode, so that it is possible to reduce the intrusion of flying objects into the inner nozzle. Furthermore, since this inner nozzle has an insulating member and a shielding member, it is possible to more reliably prevent flying objects from reaching above the welding electrode.

Further, the gas shield nozzle according to the present invention includes:
As mentioned above, it has a dual structure of inner and outer parts, and gas supply means are provided in both nozzles, respectively.
Even if the inner diameter of the inner nozzle is made thinner, the amount of shielding gas supplied will not decrease.

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Note that the following description will be made regarding the case where the present invention is applied to a high-speed rotating arc welding device.

In Fig. 1, 1 is a welding electrode, 2 is a welding wire, 2a is a welding arc, 3 is an inner nozzle, 4 is an outer nozzle, 3a and 4a are inner (outer) nozzle openings, and 3b and 4b are inner (outer) Gas supply port, 3
c, 4c are inner (outer) gas jet ports, 5 is an insulating member, 6 is a packing (shielding member), 7 is a partition wall, 7a
8 indicates the pores of the partition wall, and 8 indicates the reservoir (protrusion).

First, the high-speed rotating arc welding device will be briefly explained.

A rotation mechanism (not shown) such as a self-aligning bearing is provided above the electrode 1, and when this rotation mechanism is driven, the electrode 1 performs a pestle rotation movement using its upper end as a fulcrum. Due to the movement, the tip of the welding wire 2 sent out from the lower end of the electrode 1 and the welding arc 2a perform a rotating circular motion. Note that since the electrode 1 is supported using the upper end as a fulcrum, when the lower end of the electrode 1 is rotating, the electrode 1 itself does not rotate about its axis. For more information on high-speed rotating arc welding equipment,
Please refer to the above-mentioned Japanese Patent Application Laid-Open No. 104684/1984.

Next, the gas shield nozzle of the present invention will be explained. The electrode 1 passes through a heat-resistant insulating member 5, and is inserted into a heat-resistant inner nozzle 3 made of ceramic, for example, through the insulating member 5. The inner diameter of the opening 3a of this inner nozzle is made as narrow as possible to the range of movement around the axis of the electrode 1, but here it is about the rotation diameter of the pestle rotation. By reducing the opening diameter, that is, reducing the opening area, the rate at which flying objects such as spatter enter the inner nozzle is reduced. Even if spatter gets into the inner nozzle, the heat is absorbed by the heat-resistant insulating member (for example, Bakelite) 5, and adhesion of spatter can be prevented. Furthermore, since the upper part of the inner nozzle is shielded by the packing 6, spatter does not reach the rotating mechanism such as the self-aligning bearing above the packing 6. In addition, in the lower half of the inner nozzle,
An outer nozzle 4 made of the same material as the inner nozzle is attached or integrally formed, and a partition wall 7 is provided on the inner surface of the outer nozzle 4 to separate the opening 4a of the outer nozzle and the gas outlet 4b. The partition wall 7 has gas circulation pores 7a.

These inner and outer nozzles 3 and 4 each have gas jet ports 3b and 4b and gas supply ports 3c and 4c,
Shielding gas is supplied from an external gas supply source (not shown) to the welding portion through these gas jet ports 3b, 4b, gas supply ports 3c, 4c, and respective openings 3a, 4a. The amount of gas supplied from the inner nozzle is limited by the small opening area of the opening 3a as described above, but this can be supplemented by the gas supplied from the outer nozzle 4.

As shown in FIG. 1, if the shape of the inner nozzle 3 is approximately Ψ-shaped in cross section and a reservoir 8 is provided to surround the insulating member 5, spatter that has entered the inner nozzle during upward welding will be removed from the reservoir 8. can be collected in. The spatters collected in the reservoir 8 do not stick to the insulating member 5 because the heat is absorbed by the insulating member 5, and fall when welding starts downward, openings 3a and 4a.
can be naturally excreted from

[Effects of the Invention] As explained above, the present invention has a simple configuration in which the gas shield nozzle has a double structure consisting of an outer nozzle and a small diameter inner nozzle, and an insulating member and a shielding member are provided, thereby making it possible to perform upward welding. When this process is carried out, it is difficult for flying objects such as spatter to enter the vicinity of the welding electrode, and even if they do, they can be prevented from reaching or adhering to the upper part of the welding electrode.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a gas shield nozzle according to an embodiment of the present invention. In the figure, 1 is a welding electrode, 3 is an inner nozzle,
4 is an outer nozzle, 3a and 4a are inner (outer) nozzle openings, 3b and 4b are inner (outer) gas supply ports, 3c and 4c are inner (outer) gas jet ports, 5 is an insulating member, and 6 is a packing ( shielding member), 7 is a partition wall,
7a is a pore of the partition wall, and 8 is a reservoir (protrusion). Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A heat-resistant insulating member through which the welding electrode passes; the electrode is inserted through the insulating member, and the opening diameter on the tip side of the electrode moves about the axis of the electrode. a heat-resistant inner nozzle of about 100 liters, a shielding member that shields an opening above the insulating member of the inner nozzle, a heat-resistant outer nozzle attached to or integrally formed with the lower half of the inner nozzle; Each of the inner and outer nozzles is provided with a
A gas shield nozzle comprising: gas supply means for supplying shielding gas toward the opening on the tip side of each of the electrodes. 2. The electrode is an electrode that can be freely rotated by a rotation mechanism provided above the shielding member, and the range of movement around the axis is the rotation range of this rotation. A gas shield nozzle according to claim 1. 3. The gas shield nozzle according to claim 1, wherein the inner and outer nozzles are made of ceramic. 4. The gas shield nozzle according to claim 1, wherein the insulating member includes Bakelite.