JP7238418B2 - Wire feeding tip and wire torch - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to wire feeding tips and wire torches, and more particularly to wire feeding tips and wire torches for welding narrow grooves or constrictions.

Conventionally, in TIG welding and the like, a hot wire method is used to increase the amount of melt. The hot wire method is a method in which power is supplied to a welding wire, which is a filler material, and resistance heating is used to feed the welding wire in a semi-molten state into a molten pool. The hot wire process typically uses a wire torch to feed the welding wire. A wire torch is provided with a power supply unit including a spring mechanism or the like for supplying power to a welding wire (see Patent Document 1).

Japanese Patent Application Laid-Open No. 2002-1541

By the way, when TIG welding or the like is performed on a narrow groove or a narrow portion by the hot wire method using the above wire torch, the power supply portion of the wire torch interferes with the groove or the like. Welding needs to be performed with a longer energizing distance (the length from the power feeding point of the welding wire to the tip of the welding wire) than usual.

However, if the current-carrying distance of the welding wire is lengthened, the portion to be heated by resistance heat generation of the welding wire is lengthened, so there is a possibility that the oxidation of the welding wire increases. In addition, when the heated portion of the welding wire becomes longer, the welding wire is softened in a semi-molten state, so it becomes difficult to position the tip of the welding wire in the molten pool, and the feeding position stability of the welding wire decreases. Sometimes. When TIG welding or the like is performed on a narrow gap or a narrow portion by the hot wire method, sound welding may not be possible due to an increase in oxidation of the welding wire and a decrease in the stability of the feeding position of the welding wire. .

SUMMARY OF THE INVENTION An object of the present disclosure is to provide a wire feed tip and a wire torch that are capable of soundly welding a narrow groove or a narrow portion.

A wire-feeding tip according to the present disclosure is a wire-feeding tip for welding a narrow groove or narrow portion, is formed of a conductive material, and has a welding wire insertion hole through which a welding wire is inserted. A main body is provided on the inner peripheral surface of the welding wire insertion hole, the tip main body is arranged apart from each other along the welding wire insertion direction, and is made of a conductive material, and is formed of a conductive material. It has a plurality of current-carrying parts that are in contact with each other and conduct electricity, wherein the plurality of current-carrying parts are composed of two current-carrying parts, one of which is provided on the distal end side of the tip body in the welding wire insertion direction, The other current-carrying part is provided on the base end side of the tip body in the welding wire insertion direction, and when the welding wire is supplied with the wire current, the current-carrying part between the one current-carrying part and the other current-carrying part is closed. An amount of resistance heat generated by the tip body is larger than an amount of resistance heat generated by the welding wire between the one current-carrying portion and the other current-carrying portion.

In the wire feeding tip according to the present disclosure, the plurality of conducting parts may be formed so as to protrude from the inner peripheral surface of the welding wire insertion hole.

In the wire feeding tip according to the present disclosure, the welding wire insertion hole may be filled with inert gas or nitrogen gas.

In the wire feeding tip according to the present disclosure, the tip body may be composed of split bodies divided into two or more in the welding wire insertion direction.

A wire torch according to the present disclosure is characterized by comprising the wire feeding tip described above.

According to the wire feed tip and the wire torch having the above-described configurations, it is possible to suppress heating due to resistance heat generated when the wire current reaches the tip side of the welding wire. It becomes possible.

FIG. 2 is a diagram showing the configuration of a wire feeding tip in the first embodiment of the present disclosure; FIG. FIG. 4 is a diagram for explaining the function of a current-carrying unit in the first embodiment of the present disclosure; FIG. FIG. 4 is a schematic diagram for explaining a welding method for narrow groove welding using a wire feeding tip in the first embodiment of the present disclosure; FIG. 6 is a diagram showing the configuration of a wire feeding tip in the second embodiment of the present disclosure; FIG. 10 is a diagram showing a state in which divided bodies are connected to form a wire feeding tip in the second embodiment of the present disclosure;

[First embodiment]
A first embodiment of the present disclosure will be described in detail below with reference to the drawings. FIG. 1 is a diagram showing the configuration of a wire feeding tip 10. As shown in FIG. The wire feed tip 10 is for welding a narrow groove or a narrow portion by a hot wire method or the like. The narrow groove or narrow portion is, for example, a U-shaped narrow groove or the like. The wire feeding tip 10 can be attached to the torch body 3 of the wire torch 1 by, for example, a connector or the like. The torch body 3 is provided with a power feeding point for feeding power to the welding wire W, and the welding wire W is fed through the torch body 3 from a wire heating power source (not shown). The welding wire W is a welding material used for welding.

Wire feed tip 10 includes a tip body 12 formed of an electrically conductive material. The tip main body 12 can be formed in a tubular shape such as a cylindrical shape or a rectangular tubular shape. The tip body 12 is preferably formed with a small diameter so that it can be inserted into a narrow groove or a narrow portion. The chip body 12 can be made of a metal material such as copper or steel, or a conductive material such as conductive ceramics. The reason why the tip body 12 is made of a conductive material is that a shunt current obtained by shunting the wire current flows through the tip body 12, as will be described later.

The tip body 12 has a welding wire insertion hole 14 through which the welding wire W can be inserted. The welding wire insertion hole 14 is formed as a through hole along the welding wire insertion direction from the distal end side to the proximal end side of the tip body 12 . The tip side of the tip body 12 is the tip side of the welding wire W, and the base end side of the tip body 12 is the torch body 3 side. The welding wire insertion hole 14 is formed with a diameter larger than the wire diameter of the welding wire W in order to insert the welding wire W therethrough. Thus, the hole diameter of the welding wire insertion hole 14 depends on the wire diameter of the welding wire W to be used. Further, the distal end side of the tip body 12 is formed so that the distal end portion of the welding wire W can protrude. The base end side of the tip body 12 is formed so as to be fittable and connectable to a connector or the like attached to the torch body 3 .

The tip body 12 is made of a conductive material, and has a plurality of conducting parts 16 and 18 that are in contact with the welding wire W and conduct electricity. The plurality of conducting parts 16 and 18 are provided on the inner peripheral surface of the welding wire insertion hole 14 and are spaced apart from each other along the welding wire insertion direction. In the wire feeding tip 10 shown in FIG. 1, two conducting parts 16 and 18 are provided in the tip body 12. One conducting portion 16 is provided on the distal end side of the tip body 12 in the welding wire insertion direction, and the other conducting portion 18 is provided on the proximal end side of the tip body 12 in the welding wire insertion direction.

The conducting parts 16 and 18 are provided on the inner peripheral surface of the welding wire insertion hole 14 and have a function of contacting the welding wire W to conduct electricity. As a result, the wire current flowing through the welding wire W supplied with power from the torch body 3 can be split, and the split wire currents can be merged, so that the wire current can generate resistance heat on the way to the tip side of the welding wire W. can be suppressed.

Next, the functions of the current-carrying sections 16 and 18 will be described in more detail. FIG. 2 is a diagram for explaining the functions of the current-carrying parts 16 and 18. As shown in FIG. The arrows in FIG. 2 indicate the flow of each current. A wire current is supplied to the welding wire W through the torch body 3 from a wire heating power source (not shown). A wire current flowing through the welding wire W is divided into a divided current flowing through the tip body 12 and a divided current flowing through the welding wire W at the conducting portion 18 . The shunt current flowing through the tip body 12 and the shunt current flowing through the welding wire W merge at the conducting portion 16 . As a result, a wire current consisting of the merged shunt current flows from the tip of the welding wire W to the current-carrying portion 16 .

Since a shunt current smaller than the wire current flows through the welding wire W between the current-carrying portion 16 and the current-carrying portion 18, resistance heating of the welding wire W is suppressed. As a result, heating of the welding wire W on the way from the feed point of the welding wire W to the distal end side of the welding wire W can be suppressed, so that oxidation of the welding wire W can be reduced. Moreover, since the wire current can suppress the heating of the welding wire W on the way from the feed point of the welding wire W to the distal end side, the decrease in the hardness of the welding wire W can be suppressed. This increases the positioning accuracy when feeding the tip of the welding wire W into the molten pool, and improves the feeding position stability of the welding wire W.

The current-carrying parts 16 and 18 can be made of a metal material such as copper or steel, or a conductive material such as conductive ceramics. The conducting parts 16 and 18 may be made of the same conductive material as the chip body 12 or may be made of a different conductive material from the chip body 12 . For example, the chip body 12 and the current-carrying parts 16 and 18 may be made of a copper material, or the chip body 12 may be made of a copper material and the current-carrying parts 16 and 18 may be made of a steel material. The conducting parts 16 and 18 may be formed integrally with the tip body 12 or may be formed separately.

Since the current-carrying parts 16 and 18 slide on the welding wire W, they are preferably made of a wear-resistant conductive material. As a result, the wear of the current-carrying parts 16, 18 can be reduced, so that the contact reliability between the current-carrying parts 16, 18 and the welding wire W is improved. Steel or conductive ceramics can be used as the wear-resistant conductive material. For example, the chip body 12 can be made of copper, and the current-carrying parts 16 and 18 can be made of steel or conductive ceramics.

The current-carrying portions 16 and 18 can be formed so as to protrude from the inner peripheral surface of the welding wire insertion hole 14 . Thereby, the contact reliability between the current-carrying portions 16 and 18 and the welding wire W can be further improved. The current-carrying portions 16 and 18 are preferably formed of projections protruding from the inner peripheral surface of the welding wire insertion hole 14 toward the center axis direction of the welding wire insertion hole 14 . The convex portions of the conducting portions 16 and 18 are preferably provided so as to be in contact with the welding wire W through point contact, line contact, surface contact, or the like.

The current-carrying portions 16 and 18 can be formed by annular projections such as annular or square annular projections. The inner diameters of the annular projections of the current-carrying portions 16 and 18 are preferably formed to be substantially the same as or slightly larger than the outer diameter of the welding wire W so that the welding wire W can be inserted through them in contact therewith. The annular protrusions of the current-carrying portions 16 and 18 may be formed by protrusions having a trapezoidal cross-section parallel to the welding wire insertion direction. The welding wire W can be easily passed through the current-carrying portions 16 and 18 by tapering both ends of the annular projection in the welding wire insertion direction. The shape of the current-carrying portions 16 and 18 is not limited to the annular convex portion, and can be formed by a convex portion such as a spherical shape or an arc shape. Also, the current-carrying portions 16 and 18 may be formed by angular projections such as triangular or square projections.

When a wire current is supplied to the welding wire W, the resistance heat generation amount of the tip body 12 between the current-carrying portion 16 and the current-carrying portion 18 is the resistance heat-generation amount of the welding wire W between the current-carrying portion 16 and the current-carrying portion 18. should be larger than This is because the tip body 12 is exposed to the outside air, so even if the tip body 12 is heated, it is cooled by the outside air. On the other hand, since the welding wire W is inserted through the welding wire insertion hole 14 of the tip body 12, it becomes difficult to cool the welding wire W when it is heated.

In order to adjust the amount of resistance heat generated by the tip body 12 and the welding wire W, the shunt current flowing through the tip body 12 and the welding wire W may be adjusted by adjusting the resistance of the tip body 12 and the welding wire W. The resistance of the tip body 12 and the welding wire W depends on the material of the tip body 12 and the welding wire W (specific resistance value, etc.), the dimensions of the tip body 12 and the welding wire W (the cross-sectional area in the direction perpendicular to the welding wire insertion direction, etc.). ) can be adjusted by changing In this way, when the wire current is supplied to the welding wire W, the amount of resistance heat generated by the tip body 12 between the current-carrying portion 16 and the current-carrying portion 18 is determined by the welding wire W between the current-carrying portion 16 and the current-carrying portion 18 . , the heating of the welding wire W due to resistance heat generation can be further suppressed.

The interval between the current-carrying portion 16 and the current-carrying portion 18 is preferably provided with a predetermined length so that the wire current can be diverted. This is because if the distance between the current-carrying portion 16 and the current-carrying portion 18 becomes too small, it becomes difficult to shunt the wire current. The conducting portion 16 is preferably provided on the distal end side of the tip body 12 in the welding wire insertion direction, and the conducting portion 18 is preferably provided on the proximal end side of the tip body 12 in the welding wire insertion direction. By arranging the current-carrying portion 16 and the current-carrying portion 18 on the distal end side and the base end side of the tip body 12 in the welding wire insertion direction, the distance between the current-carrying portion 16 and the current-carrying portion 18 becomes longer. , the wire current can be further suppressed from heating due to resistance heating on the way from the feed point of the welding wire W to the tip side. Moreover, the conducting portion 16 is preferably provided at a position 70 mm to 80 mm from the tip of the welding wire W. As shown in FIG. As a result, the distance through which the wire current flows from the conducting portion 16 to the tip of the welding wire W can be substantially the same as the distance through which the wire current flows in normal welding. In addition, although the tip body 12 is composed of two current-carrying parts 16 and 18, it is not limited to the two current-carrying parts 16 and 18, and a plurality of current-carrying parts such as three or five may be provided. good.

The welding wire insertion hole 14 is preferably filled with inert gas or nitrogen gas. Thereby, the oxidation of the welding wire W can be further suppressed. For example, the entire length of the welding wire insertion hole 14 may be filled with an inert gas or the like, or only the welding wire insertion hole 14 between the current-carrying portion 16 and the current-carrying portion 18 may be filled with the inert gas or the like. good too. Argon gas or the like may be used as the inert gas. In order to fill the welding wire insertion hole 14 with the inert gas or nitrogen gas, the welding wire insertion hole 14 may be supplied with or filled with the inert gas or nitrogen gas.

In the above configuration, the wire feeding tip 10 is attached to the torch body 3 of the wire torch 1 with a connector or the like, but the wire feeding tip 10 itself can also be used as a wire torch. is. More specifically, when the wire feeding tip 10 is used as the wire torch 1, for example, a wire heating power source (not shown) and the conducting portion 18 on the base end side of the tip body 12 are connected by an electric cable or the like. Make an electrical connection. As a result, the welding wire W is supplied with power from a wire heating power source (not shown) through the current-carrying portion 18 . The supplied wire current is split into a split current flowing through the tip body 12 and a split current flowing through the welding wire W at the conducting portion 18 . The shunt current flowing through the tip body 12 and the shunt current flowing through the welding wire W merge at the conducting portion 16 on the tip side of the tip body 12 . By using the wire feeding tip 10 itself as the wire torch in this manner, the configuration of the wire torch can be simplified, and the welding cost can be reduced.

Next, a welding method for narrow gap welding using the wire feed tip 10 will be described. Narrow groove welding can be applied to butt joints, corner joints, and the like in welding positions such as downward, sideways, vertical, and upward, for example. A narrow groove is, for example, a groove having a groove angle of 0° to 30°, a groove depth of 40 mm or more, and a groove width of 20 mm or less. FIG. 3 is a schematic diagram for explaining a welding method for narrow gap welding using the wire feed tip 10, FIG. 3(a) is a schematic diagram of the welding direction, and FIG. It is a schematic diagram of the groove front. FIG. 3 shows a case where the wire feeding tip 10 is attached to the torch body 3 of the wire torch 1 with a connector or the like. Moreover, FIG. 3 shows the case of performing narrow gap welding by TIG welding by the hot wire method.

The members to be welded 20 and 22 are formed of thick plates having a thickness of 40 mm or more, for example. The members to be welded 20 and 22 are provided with grooves for welding. This groove is formed as a U-shaped narrow groove.

A welding torch 30 for TIG welding and members to be welded 20, 22 are electrically connected to a TIG welding power supply (not shown) by an electric cable or the like. The wire torch 1 and the members to be welded 20 and 22 are electrically connected to a wire heating power source (not shown) by an electric cable or the like. The wire torch 1 is connected to a wire feeder (not shown), and is configured to be able to feed the welding wire W from the wire feeder (not shown).

The tip side of the wire feeding tip 10 is inserted into the groove. Power is supplied to the welding wire W from a wire heating power supply (not shown) through the torch body 3 of the wire torch 1 . A wire current flowing through the welding wire W is divided into a divided current flowing through the tip body 12 and a divided current flowing through the welding wire W at the conducting portion 18 . The shunt current flowing through the tip body 12 and the shunt current flowing through the welding wire W merge at the conducting portion 16 . From the tip of the welding wire W to the current-carrying portion 16 , a wire current consisting of the merged shunt current flows. As a result, the tip of the welding wire W to the current-carrying portion 16 are heated to a high temperature and are in a semi-molten state. The welding torch 30 generates an arc A between the tungsten electrode 32 and the members to be welded 20, 22 in, for example, an inert gas atmosphere, and the members to be welded 20, 22 are melted by the arc heat to form a molten pool M. Form. The wire feed tip 10 is positioned so that the tip of the welding wire W is positioned near the molten pool M. As shown in FIG.

In this way, narrow gap welding can be performed by the hot wire method using the wire feed tip 10 . By dividing the wire current by the current-carrying portion 16 and the current-carrying portion 18, it is possible to suppress the wire current from heating due to resistance heat generated on the way from the feed point of the welding wire W to the distal end side. As a result, oxidation of the welding wire W can be reduced, and the feed position stability of the welding wire W can be improved, so that narrow gap welding can be performed soundly by the hot wire method. In the above, the welding method for narrow gap welding using the wire feeding tip 10 has been described as an example, but welding of a narrow portion using the wire feeding tip 10 can also be performed in the same manner as narrow gap welding. is possible. In the above, welding is performed by TIG welding by the hot wire method, but the welding method to which the hot wire method can be applied is not limited to TIG welding, and can also be applied to plasma arc welding, laser welding, etc. is.

As described above, according to the above configuration, the tip body is formed of a conductive material and has a welding wire insertion hole through which the welding wire is inserted. It has a plurality of current-carrying parts that are spaced apart from each other along the wire insertion direction, are made of a conductive material, and are in contact with the welding wire to conduct current, so that the wire current reaches the feeding point of the welding wire. It is possible to suppress heating due to resistance heat generation on the way from the tip to the tip side. As a result, even when a narrow groove or a narrow portion is welded by the hot wire method, it is possible to reduce the oxidation of the welding wire and improve the stability of the feeding position of the welding wire, thereby enabling sound welding.

[Second embodiment]
Next, a second embodiment of the present disclosure will be described in detail with reference to the drawings. The wire feeding tip of the second embodiment differs from the wire feeding tip of the first embodiment in that the tip body is composed of two or more divided bodies. FIG. 4 is a diagram showing the configuration of the wire feeding tip 40. As shown in FIG. In addition, the same code|symbol is attached|subjected to the same element and detailed description is abbreviate|omitted.

The wire feed tip 40 is constructed by connecting split bodies 42 and 44 that are split into two or more in the welding wire insertion direction. The wire feeding tip 40 shown in FIG. 4 is composed of two divided bodies 42,44. Since the wire feeding tip 40 is configured by connecting a plurality of divided bodies 42 and 44, the length of the wire feeding tip 40 in the welding wire insertion direction can be easily adjusted.

A split body 42 on the distal end side of the wire feeding tip 40 is made of a conductive material. As the conductive material forming the divided body 42, the same conductive material as the conductive material forming the chip body 12 of the first embodiment can be used. The split body 42 has a welding wire insertion hole 46 through which the welding wire is inserted. The welding wire insertion holes 46 of the split body 42 can be formed in the same manner as the welding wire insertion holes 14 of the tip body 12 of the first embodiment.

On one end side of the split body 42 in the welding wire insertion direction, there is a conducting portion 48 which is provided on the inner peripheral surface of the welding wire insertion hole 46, is formed of a conductive material, and contacts the welding wire to conduct electricity. ing. The conducting portion 48 of the divided body 42 can be configured in the same manner as the conducting portion 16 of the tip body 12 of the first embodiment. A connecting portion 50 for connecting to another split body 44 is provided on the other end side of the split body 42 in the welding wire insertion direction. The connection portion 50 of the divided body 42 is formed by a fitting hole in which a female screw is formed on the inner peripheral surface of the welding wire insertion hole 46 .

A split body 44 on the proximal side of the wire feeding tip 40 is made of a conductive material. As the conductive material forming the divided body 44, the same conductive material as the conductive material forming the chip body 12 of the first embodiment can be used. The split body 44 has a welding wire insertion hole 52 through which the welding wire is inserted. The welding wire insertion hole 52 of the split body 44 can be formed in the same manner as the welding wire insertion hole 14 of the tip body 12 of the first embodiment. The length of the split body 44 in the welding wire insertion direction may be the same as or different from the length of the split body 42 in the welding wire insertion direction.

A connecting portion 54 for connecting to another split body 42 is provided on one end side of the split body 44 in the welding wire insertion direction. The connection portion 54 of the divided body 44 is formed by a fitting protrusion having a male screw formed on the outer peripheral surface of the divided body 44 . The connecting portion 54 of the divided body 44 is formed so as to be fittable with the connecting portion 50 of the divided body 42 . On the other end side of the split body 44 in the welding wire insertion direction, a conducting portion 56 is provided on the inner peripheral surface of the welding wire insertion hole 52, is formed of a conductive material, and contacts the welding wire W to conduct electricity. have. The conducting portion 56 of the divided body 44 can be configured in the same manner as the conducting portion 18 of the tip body 12 of the first embodiment.

FIG. 5 is a diagram showing a state in which the split bodies 42 and 44 are connected to form the wire feeding tip 40. As shown in FIG. 5 shows a case where the wire feeding tip 40 is attached to the torch body 3 of the wire torch 1 by means of a connector or the like. The wire feeding tip 40 can be assembled by fitting and connecting the connecting portion 50 of the divided body 42 and the connecting portion 54 of the divided body 44 .

Although the wire feeding tip 40 shown in FIGS. 4 and 5 is divided into two parts, the number of divisions of the wire feeding tip 40 is not particularly limited, and may be three parts, five parts, or the like. For example, when the wire feeding tip is divided into three parts, another intermediate split body may be connected between the split bodies 42 and 44 . In such an intermediate split body, one end side in the welding wire insertion direction is configured similarly to the connection portion 54 of the split body 44, and the other end side in the welding wire insertion direction is configured similarly to the connection portion 50 of the split body 42. Just do it. As a result, one end side of the intermediate split body can be connected to the connection portion 50 of the split body 42 , and the other end side of the intermediate split body can be connected to the connection portion 54 of the split body 44 .

As described above, according to the above configuration, the effects of the first embodiment can be obtained, and since the wire feeding tip is composed of a plurality of divided bodies, the wire feeding tip can be adjusted according to the shape of the narrow groove or narrow portion. The length in the welding wire insertion direction can be adjusted. As a result, there is no need to provide a wire feed tip for each shape of the narrow groove or narrow portion, so welding costs can be reduced.

Reference Signs List 1 wire torch 3 torch main body 10, 40 wire feeding tip 12 tip main body 14, 46, 52 welding wire insertion hole 16, 18, 48, 56 current-carrying part 42, 44 split body 50, 54 connecting part

Claims (5)

A wire feeding tip for welding narrow grooves or constricted parts,
A tip body made of a conductive material and having a welding wire insertion hole through which the welding wire is inserted;
The tip body is provided on the inner peripheral surface of the welding wire insertion hole, is arranged apart from each other along the welding wire insertion direction, and is made of a conductive material. having a plurality of current-carrying parts that
The plurality of current-carrying parts are composed of two current-carrying parts,
One conducting portion is provided on the distal end side of the tip body in the welding wire insertion direction, and the other conducting portion is provided on the proximal end side of the tip body in the welding wire insertion direction,
When a wire current is supplied to the welding wire, the amount of resistance heat generated by the tip body between the one current-carrying part and the other current-carrying part is equal to that between the one current-carrying part and the other current-carrying part. A wire feeding tip , wherein the resistance heating value of said welding wire is larger than that of said welding wire. The wire feeding tip of claim 1, comprising:
The wire feeding tip, wherein the plurality of conducting parts are formed so as to protrude from an inner peripheral surface of the welding wire insertion hole. 3. A wire feeding tip according to claim 1 or 2 ,
A wire feeding tip, wherein the welding wire insertion hole is filled with inert gas or nitrogen gas. A wire feeding tip according to any one of claims 1 to 3 ,
A wire feeding tip, wherein the tip body is composed of two or more divided bodies in the welding wire insertion direction. A wire torch comprising the wire feeding tip according to any one of claims 1 to 4 .

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