JPH0144235Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a consumable electrode type gas-encapsulated arc welding device such as a carbon dioxide arc welding machine or a micro MIG welding machine, and in particular to a welding method that can effectively prevent spatter from adhering to a welding torch. It is related to the device.

Prior Art A type of gas-encapsulated arc welding device is a consumable electrode type welding device that performs welding using a welding wire as one electrode, which is continuously supplied from a wire reel to the current-carrying tip of a welding torch as a supply roller rotates. There is.

In this type of welding equipment, spatters scattered during welding adhere to the welding torch, and when the amount of adhesion increases, the adhering spatters may clog the energizing tip of the welding torch or cause a short circuit between the gas nozzle and the energizing tip. This makes the state of the arc unstable, and also disturbs the gas flow, reducing the gas envelopment effect at the welding point, and causing pinholes, blowholes, craters, etc. For this reason, in the past, the energizing tip and gas nozzle at the tip of the welding torch were directly immersed in a container containing the spatter adhesion preventive agent, and this immersion coated them with the spatter adhesion preventive agent, thereby eliminating spatter. I try not to let it stick. However, in conventional welding equipment in which the anti-spatter adhesion agent is applied to the welding torch by dipping, the effectiveness of the anti-spatter adhesion agent applied to the welding torch only lasts temporarily. It is necessary to perform the dipping operation frequently between welding operations, which is one of the causes of a decrease in the efficiency of welding operations.
In addition, it is common for welding work to continue without realizing that the spatter adhesion prevention agent has lost its effectiveness, resulting in clogging of the current-carrying tip or short circuit between the current-carrying tip and the gas nozzle. In such cases, welding work has to be interrupted for a considerable period of time in order to repair or replace the energizing tip or gas nozzle, which is extremely inconvenient.

Purpose of the invention The present invention was made against the background of the above-mentioned circumstances, and its purpose is to remove spatter adhesion prevention agent from the welding torch without interrupting the welding work as in the past. An object of the present invention is to provide a consumable electrode type gas-encapsulated arc welding device that can be protected at all times by.

Structure of the Invention In order to achieve this object, the consumable electrode type gas-encapsulated arc welding apparatus according to the invention includes a spatter adhesion prevention agent contained in the wire supply path between the supply roller and the current-carrying tip of the welding torch. While an anti-adhesive agent container is provided, the anti-adhesive agent container is provided with a wire passageway extending through the bottom of the anti-adhesive agent container, and the welding wire is supplied to the energizing tip of the welding torch through the wire passageway.

Effects of the invention By doing this, when the welding wire passes through the anti-adhesion agent container, the anti-spatter adhesion agent is applied to the outer surface of the welding wire, and the anti-spatter adhesion agent applied to the outer surface moves the welding wire. It is also guided to the energizing tip of the welding torch. As a result of the viscosity of the anti-spatter agent introduced to the current-carrying tip of the welding torch being reduced by the heat during welding, the spatter adhesion preventive agent is transmitted not only to the current-carrying tip but also to the outer surface of the current-carrying tip, or by evaporation. It also adheres to gas nozzles. In other words, according to the welding device according to the present invention, the welding torch can be constantly protected by the spatter adhesion prevention agent without having to immerse the welding torch one by one in the container containing the spatter adhesion prevention agent as in the conventional case. The efficiency of welding work can be greatly improved. Additionally, since welding work is no longer performed without the protection of spatter adhesion prevention agents, there is no longer any need to interrupt welding work to remove spatters or replace chips. All in all, the efficiency of welding work was greatly improved.

In addition, the welding torch is always protected by the spatter adhesion prevention agent, allowing stable arc generation and complete gas encapsulation, making it possible to consistently obtain products with good welding quality. It is,
Furthermore, since there is no longer a need to repair the welding torch between welding operations, the risk of the repair worker coming into contact with the welding torch that has been heated up by welding heat can be prevented. Furthermore, when repairing, it was necessary to file down the current-carrying chips, etc., but since this is no longer necessary, their lifespan can be extended.

In addition, in the present invention, since the welding wire passes through the bottom of the anti-adhesive agent container, the anti-spatter agent is supplied to the welding torch in the order in which it is stored, and as a result of changes over time. There is also the advantage that degraded anti-spatter agent is not sent to the welding torch, and the welding torch is always protected by fresh anti-spatter agent.

In addition, the present invention has the advantage that the welding torch can be more effectively protected with a smaller amount of spatter adhesion inhibitor. That is, as is clear from the relationship between the welding current and the spatter occurrence rate when the welding wire is made of mild steel with a diameter of 1.2 mm as shown in Figure 1,
Since the incidence of spatter increases with the increase of welding current, in order to more effectively protect the welding torch with a smaller amount of spatter adhesion inhibitor, it is necessary to prevent spatter adhesion on the welding torch according to the welding current. However, according to the present invention, the amount of spatter adhesion prevention agent applied to the welding wire is kept almost constant, and the welding wire supply rate increases with the welding current. Such adjustment is automatically performed because the amount of spatter adhesion prevention agent supplied increases as the amount increases.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

FIG. 2 is a diagram showing the welding torch 10. In this figure, reference numeral 12 denotes a holder, and an energizing tip 16 is attached to the tip of the holder, which guides the welding wire 14 and supplies welding current to the welding wire 14. A cylindrical gas nozzle 18 is attached so as to cover and separate from the cylindrical gas nozzle 18. Further, the holder 12 is provided with a feed switch 20, and when the feed switch 20 is operated, the welding wire 14 is fed out from the tip of the energizing tip 16, and the tip of the welding wire 14 and the workpiece (base metal) are fed out. ), and an encapsulating gas such as an inert gas, carbon dioxide gas, or a predetermined mixed gas to encapsulate the welded portion is blown out from the open end of the gas nozzle 18. Arc welding is now being performed on the base metal. Note that 2 is a guard member for protecting the worker's hands.

At the base end of such a welding torch 10, a third
As shown in the figure, a wire tube 24 for guiding the welding wire 14 and a gas tube 26 for guiding the encapsulated gas are connected, and a wire supply device 28 and a gas cylinder 30 are connected through these tubes. The welding wire 14 and the encapsulating gas are supplied from respectively. Further, a power cord 32 is connected to the welding torch 10, and welding current is supplied from a power source 34.

The wire supply device 28 includes, in its case 35,
a wire reel 36 around which welding wire 14 is wound;
It is provided with a supply roller 38 that rotates when the feed switch 20 is operated, and draws out the welding wire 14 from the wire reel 38 and supplies it to the wire tube 24 according to the rotation amount, and when the feed switch 20 is operated, At this time, the welding wire 14 is supplied to the welding torch 10 via the wire tube 24. As a result, the welding wire 14 is fed out from the tip of the current-carrying tip 16. In this embodiment, there is a gap between the supply roller 38 and the wire tube 24, which is the passage for the welding wire 14 supplied in this way.
A spatter adhesion prevention agent 44 (described later) is applied to the welding wire 14.
Spatter adhesion prevention agent coating device 4 for coating on
0 is provided, and the welding wire 14 coated with the spatter adhesion preventive agent 44 by the spatter adhesion preventive agent application device 40 is supplied to the welding torch 10 via the wire tube 24.

That is, in the spatter adhesion prevention agent coating device 40 shown in FIGS. 4 to 6, 42 is a main body of the device, the upper part of which is an adhesion prevention agent container 46 that accommodates a grease-like spatter adhesion prevention agent 44.
A lower base portion 48 formed integrally with the container 46 is fixed to the case 35 of the wire feeding device 28 . Note that the base portion 48 may be separate from the container 46. The accommodating portion 50 for accommodating the spatter anti-adhesion agent 44 of the anti-adhesion agent container 46 has a cylindrical shape with a vertical axis, and the bottom thereof has a conical shape with a downward taper as shown in FIG. It is said to be the shape. In addition, in FIG. 7, the top of the cone is shaped like an acute angle, but it may be shaped like an arc.

A through hole 52 having a diameter slightly larger than the diameter of the welding wire 14 is provided horizontally through the container 46 so as to pass through the vicinity of the top of the cone of the housing portion 50 . The welding wire 14 sent out from the welding wire 14 passes through the through hole 52 and is supplied to the wire tube 24. That is, when the welding wire 14 passes through the storage part 50 of the anti-adhesion agent container 46, the spatter adhesion prevention agent 44 is applied to the surface of the welding wire 14, and the welding wire 14 coated with the spatter adhesion prevention agent 44 is Welding torch 1 via tube 24
The current is supplied to the energizing chip 16 of 0. A wire tube holding member 54 is provided on the side wall of the apparatus main body 42 and extends to the opposite side of the supply roller 38, so that the end of the wire tube 24 is held by the wire tube holding member 54. It's getting old. In this embodiment, the through hole 52 is formed on a straight line connecting the center of the opening of the wire tube holding member 54 and the supply roller 38, so that the welding wire 14 from the supply roller 38 is tube 2
4 is now being supplied smoothly.

Further, in this embodiment, a cylindrical guide protrusion 56 is formed protruding from the opening portion of the through hole 52 of the container 46 on the supply roller 38 side toward the supply roller 38 .
The distance between the welding wire 14 and the through hole 52 is narrowed as much as possible.
The supply to the 2nd floor is now carried out smoothly. Further, the opening of the guide protrusion 56 is chamfered so that the welding wire 14 can be fed more smoothly.

According to such a welding device, the supply roller 38
Due to the rotation of the welding wire 14, the welding torch 10
When moving to the energizing tip 16, welding wire 1
The spatter adhesion prevention agent 44 applied to the welding torch 10 is also guided to the energizing tip 16 of the welding torch 10. As a result of the viscosity of the spatter adhesion prevention agent 44 being reduced by the heat during welding, the spatter adhesion prevention agent 44 is transmitted not only to the current-carrying chip 16 but also to the outer surface of the current-carrying chip 16, or evaporates due to the welding heat. It also adheres to the gas nozzle 18 by, for example. In other words, the welding torch 10 is always protected by the spatter adhesion prevention agent 44. In addition, in this embodiment, as described above, the adhesion prevention agent container 46 containing the spatter adhesion prevention agent 44 is used.
The container 46 has a conical bottom with a conical shape, and the welding wire 14 is allowed to pass near the top of the conical shape.
There is an advantage in that the welding torch 10 is protected until the spatter adhesion prevention agent 44 inside is almost exhausted.

Although one embodiment of the present invention has been described above, this is literally an illustration, and the present invention should not be interpreted as being limited to the above embodiment.

For example, in the embodiment, the anti-adhesion agent container 4
6 was supposed to contain the grease-like spatter adhesion prevention agent 44 as it is, but the adhesion prevention agent container 46 is equipped with heating means such as a heater, thereby preventing spatter adhesion. The agent 44 may be heated to reduce its viscosity appropriately in advance.

Further, in the embodiment described above, the welding wire 14 from the supply roller 38 is transferred to the through hole 5 of the anti-adhesion agent container 46.
A guide protrusion 56 was integrally formed on the side wall of the container 46 in order to smoothly guide the container 46 into the container 2.
This guide protrusion 56 may be a separate member from the container 46, and such a guide protrusion 56 may not be provided.

Furthermore, in the embodiment, the anti-adhesion agent container 46
is provided immediately downstream of the supply roller 38, but it may also be provided in the middle of the wire tube 24 or in the welding torch 10.

Although not listed in detail, it goes without saying that the present invention can be implemented with various modifications and improvements without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is a graph for explaining the relationship between welding current and spatter occurrence rate. FIG. 2 is a partially cutaway front view showing the welding torch. FIG. 3 is a schematic diagram showing a welding device according to an embodiment of the present invention. 4 to 6 are a perspective view, a plan view, and a front view, respectively, showing an example of a spatter adhesion prevention agent coating device of the welding apparatus shown in FIG. 3. Figure 7 is the 4th
FIG. 7 is an enlarged cross-sectional view showing the bottom portion of the anti-adhesion agent container shown in FIGS. 6 to 7. FIG. 10...Welding torch, 14...Welding wire, 1
6...Electricity chip, 18...Gas nozzle, 24...
...Wire tube, 36...Wire reel, 38
... Supply roller, 40 ... Spatter adhesion prevention agent applicator, 44 ... Spatter adhesion prevention agent, 46 ...
Anti-adhesion agent container, 52...through hole (wire passage).

Claims (1)

[Claims for Utility Model Registration] Consumable electrode type gas encapsulation that performs gas encapsulation arc welding using a welding wire that is continuously supplied from a wire reel to the energizing tip of a welding torch as one electrode as the supply roller rotates. In the arc welding apparatus, an anti-adhesion agent container containing an anti-spatter agent is provided on the wire supply path between the supply roller and the current-carrying tip of the welding torch, and the anti-adhesion agent container is provided with an anti-adhesive agent container containing a spatter anti-adhesive agent through the bottom thereof. 1. A consumable electrode type gas-encapsulated arc welding apparatus, characterized in that a wire passage is formed in which the welding wire is supplied to a current-carrying tip of the welding torch through the wire passage.