KR20110111934A

KR20110111934A - Contact tip of welding torch

Info

Publication number: KR20110111934A
Application number: KR1020100031264A
Authority: KR
Inventors: 박상흡
Original assignee: 공주대학교 산학협력단
Priority date: 2010-04-06
Filing date: 2010-04-06
Publication date: 2011-10-12

Abstract

The present invention is accomplished by providing a contact tip, a consumable used for a torch of a gas metal arc welder, which is connected to the anode and is a contact tip of the torch having a passage for supplying a welding wire to the center of the fuselage. Guide tip for wire transfer guide interchangably interposed between the binding tip and the fuser tip and the binder and screw-removably installed at the tip of the contact tip fuselage, guiding when the contact tip part is consumed Alternatively, each of the binders can be partially replaced to reduce the maintenance and maintenance costs of the welder.

Description

Contact tip of welding torch}

The present invention relates to an improvement of a contact tip which is a consumable used for a torch of a gas metal arc welder.

A gas metal arc automatic welding or semi-automatic arc welding machine applies current to the tip of a welding torch to generate an arc to weld the metal. The contact tip of the torch used in such an arc welding machine is connected to the anode, and the center of the torch is connected. It is structured to supply a welding wire. Accordingly, the tip forms an arc plasma between the material of the anode by hot electron emission from the end of the welding wire to perform a desired welding operation.

The torch constructed as described above has a passage in the longitudinal direction at the center of the body made of a conductive copper alloy, and the welding wire is supplied through the passage to achieve a desired arc welding at the tip of the torch, wherein the torch tip Contact tip of consumables is exposed to high temperature during arc welding, and consumes badly at the end, and at the same time, the wire is automatically supplied by a separate wire feeder in the passage. Abrasion phenomenon inevitably occurs in which the leading end shape of the passage is deformed from a garden shape to an elliptical shape due to friction with wires or the like on the inner wall of the passage.

When the tip of the passage is worn out in this way, not only the supply of the welding wire, but also its position is shifted, the arc becomes unstable, and a welding defect occurs. Such a misalignment of the wire position occurs and a good arc welding cannot be performed. A lot of sputters are generated, and the generated spatter flows into the nozzles and is attached to the nozzles, which causes welding defects by interrupting the flow of gas during welding.

Therefore, in recent years, various techniques have been proposed to solve the drawback caused by the uneven wear of the tip passage tip described above. For example, techniques such as pressing or enclosing a ring of wear-resistant material at the tip of a heavy contact tip for welding, or applying a ceramic cap to the tip surface of the contact tip, or on the surface of the contact tip. Techniques such as performing a heat resistant resin coating, and techniques such as making the tip of a contact tip a double tube structure and the inner side of the wire passage to a ceramic tube are known.

However, such a technique as press-fitting or enclosing a wear-resistant material in addition to the tip portion of the welding contact tip is prone to defects such as cracking and loosening in the press-fitted or enclosed portion of the ring, and at the same time, it is cumbersome and workable. (Precision) also has problems such as not being good, and techniques such as putting a ceramic cap on the tip surface of the contact tip or applying a heat-resistant resin coating on the surface of the contact tip have a spatter pattern on the contact tip surface. Although somewhat effective in preventing adhesion, fundamental problems such as deformation and wear of wire passageways could not be improved, and due to increased durability, they were not practical, and the entire tip was worn when the ring was pressed into the fuselage. There is also an uneconomical problem because the replacement cost is high.

And the conventional tip is made of a copper alloy material only for the role of simply generating the arc by connecting the anode with a welding wire, causing the loss of the arc heat source due to heat transfer. That is, as the tip is made of a copper alloy material having a high heat transfer rate, a heat source of the arc plasma is transferred to the inside of the torch through the tip, causing a loss.

In addition, the welding transition is performed at the end of the welding wire by the arc plasma, where the wire feeding speed is proportional to the melting speed of the wire. As the wire feed rate increases, the welding efficiency increases and the production speed also increases. Therefore, the melting speed of the wire end by the arc plasma is directly related to the welding efficiency and also related to the welding stability.

In view of this, conventionally, as heat loss occurs due to heat transfer through the tip as described above, the melt rate of the wire is lowered and the welding efficiency and the welding stability are deteriorated.

The present invention has been made in view of the above circumstances, and an object thereof is to include a screw assembly detachable binder at the tip of the tip fuselage and a wire transfer guide ring interchangably interposed between the binder and the fuselage tip. In order to provide a contact tip of the welder torch, the tip, which is a consumable, can partially replace each of the guide ring or the binder, thereby reducing the replacement cost.

Another object of the present invention is to improve the durability of the guide ring to reduce the replacement frequency, even if the cost is slightly higher, the overall cost of the torch maintenance can be reduced, in the case of the welding contact tip of the present invention, the guide ring is made of hard and durable It is to provide a contact tip of the welder torch, which can improve the maintenance and maintenance cost of the welder.

Still another object of the present invention is to provide a tip for arc welding, which is made of a heat insulating material at the tip of the tip to block heat transfer of the arc plasma heat source through the tip, thereby minimizing heat loss and thereby increasing the melting speed of the welding wire.

This object of the present invention is achieved by providing a contact tip, which is a consumable used for the torch of a gas metal arc welder, which is connected to the anode and has a passage for supplying a welding wire to the center of the fuselage. As a contact tip, the contact tip has a coupling threadably detachably installed at the tip of the body of the contact tip, and a guide ring for guiding wire transfer that is replaceably interposed between the binding body and the tip of the fuselage. When consumed, each of the guides or binders can be partially replaced, reducing the maintenance and maintenance costs of the welder.

The contact tip of the welder torch according to the present invention has a replaceable guide ring between the fuselage and the binder, so that only part of the guide ring, which is a part of the fuselage, can be used by replacing parts of the fuselage, thereby reducing the cost of maintaining and maintaining the equipment. There is an advantage to this.

In addition, if the durability is improved and the frequency of exchange is reduced, the overall cost can be reduced even if the unit price is slightly higher, but in the case of the contact tip of the present invention, the durability can be more than doubled, and the manufacturing cost can be reduced, thereby reducing the overall cost. Can be reduced.

In addition, as the insulation at the tip of the contact tip is insulated, the arc plasma heat source generated at the end of the welding wire is blocked, so that the tip is not transferred into the torch through the tip, thereby minimizing heat loss due to heat transfer, as well as the melting speed of the welding wire. It can improve the welding efficiency.

1 is an exploded perspective view of a contact tip of the welder torch of the present invention;
Figure 2 is a cross-sectional view showing the assembly configuration of the contact tip of the welder torch of the present invention.
Figure 3 is a cross-sectional view showing another embodiment of the contact tip of the welder torch of the present invention.

Next, an embodiment of the present invention will be described with reference to the drawings.

The present invention is a gas metal arc automatic welding or semi-automatic arc welding machine, that is, a method in which a current is supplied to a contact tip of a welder torch to generate an arc discharge to weld metal, thereby providing a contact tip of a torch used in such an arc welding machine. .

1 and 2 show a contact tip according to the present invention, the contact tip is connected to the anode, and has a structure for supplying a welding wire to the center of the contact tip. Accordingly, the tip forms an arc plasma between the material of the positive electrode by hot electron emission from the end of the welding wire to perform a desired welding operation.

The core technology of the present invention is to innovate the structure of the contact tip, the contact tip body is divided into two parts in the longitudinal direction consisting of the fuselage 10 and the binder 20, these fuselage 10 and the binder The guide ring 30 provided separately for the wire supply guide between 20 is interposed so that replacement is possible.

First, the body 10 is provided with a passage 12 that forms a rod-shaped tapering gradually toward the front end as usual, and provides a feed path for wire supply along the longitudinal direction in the center thereof.

In addition, the distal end of the body 10 has a screw engaging portion 14 which protrudes forward from the distal end of the body 10 for the detachable coupling of the binder 20 to be described later. The screw coupling part 14 supports the rear end of the guide ring 30 interposed between the fuselage 10 and the binder 20 as well as the detachment of the binder 20, and the screw tightening force of the binder 20 and Cooperation will be performed together with the local area to reliably embed the guide ring (30).

In addition, the guide ring 30 installed between the fuselage 10 and the binder 20 so as to be interchangeably receives the wire supplied along the passage 12 of the fuselage 10 and passes through the passage 32 to guide the welding. ), And the center of the tip of the guide ring 30 partially protrudes so as to penetrate through the front of the binder 20 and be exposed. In this case, the guide ring 30 may be made of the same material as the fuselage, or may use a somewhat harder material than the material of the fuselage.

Since the separate guide ring 30 is easy to drill the passage 32, the processing cost can be reduced, and the precision is good and the wire can be smoothly guided, thereby improving the durability, such as reducing wear. There will be.

In addition, the wire is accurately and stably supplied using the guide ring 30 having excellent precision, thereby completely preventing defects from deviating from the target position during the welding or zigzag of the beads.

In addition, the present invention has the effect of reducing the economic burden of replacing the tip fuselage as a whole when the tip is consumed as in the prior art by only partially replacing the guide ring 30 in the fuselage 10 of the tip.

In addition, the contact tip of the present invention can be used to share the product, that is, the body 10 is made of a common product that accommodates all the various wire thicknesses of a predetermined range, the guide ring 30 corresponds to different wire thicknesses By manufacturing a variety of standards by using the corresponding guide ring 30 in accordance with the thickness of the wire will be able to achieve the effect of reducing the purchase of equipment by using a common contact tip.

On the other hand, since the temperature of the arc plasma generated at the end of the welding wire is about 3,000 to 5,000 degrees or more, the binder 20 is located at a close distance from the end of the welding wire and is also placed in a very high temperature environment. Therefore, the binder 20 at the tip of the tip 10 needs to be made of a heat insulating material having a very high durability and heat resistance. At this time, the heat insulating material of the binder 20 is made of a ceramic material, and is not particularly limited as long as it is a material having heat resistance and durability.

As described above, by attaching the binder 30 which is a heat insulating material to the tip of the tip body 10 of the contact, the arc plasma heat source generated at the end of the wire is blocked and is not transmitted to the body 10 of the tip. The heat loss through the heat transfer through the tip will not occur.

3 shows another embodiment of the present invention, in the present embodiment, the inner wall of the passage 32 of the guide ring 30 is provided with a hard layer 34 made of abrasion resistance such as cemented carbide. In addition to improving durability, the service life of the guide ring can be extended by delaying the replacement time.

As described above, an embodiment of the present invention has been described, but the present invention is not limited thereto and may be changed within the scope of the claims.

10: body 12: passage
20: binder 30: guide ring
32: passage 34: hard layer

Claims

A contact tip of a torch having a passage for supplying a welding wire to the center of the fuselage, including:
Welder torch, characterized in that it is provided with a binding thread detachably installed at the distal end of the contact tip fuselage and a guide ring for guiding the wire transfer replaceably between the binder and the fuselage tip Contact tips.

The method of claim 1,
The guide ring is a contact tip of a welder torch that is harder than the material of the tip fuselage.

The method of claim 1,
A contact tip of a welder torch having a hard layer on the inner wall of the guide ring.

The method of claim 1,
The binder is the contact tip of the welder torch made of insulation.