WO2003039802A1

WO2003039802A1 - Wire guide for welding and contact tip for welding

Info

Publication number: WO2003039802A1
Application number: PCT/JP2001/009808
Authority: WO
Inventors: Koki Suzuki; Masaru Nagasawa; Masashi Suzuki
Original assignee: A.I.O.S Co., Ltd.
Priority date: 2001-11-09
Filing date: 2001-11-09
Publication date: 2003-05-15

Abstract

A cylindrical wire guide for welding (3) used together with a tip body (20) having a through hole (5) allowing a welding wire (W) to pass therethrough and a cylindrical hole (4) formed therein and formed of a tip front part (20a) and a tip rear part (20b) connected to each other with screws (6b, 6c), comprising an eccentric block guide (14) having a through hole (8) allowing the wire to pass through the center thereof and a groove (9) formed along the outer periphery and near the tip thereof and a chevron-shaped pressing spring (15) fitted to the groove of the eccentric block guide and pressing the tip side thereof against the inside wall of the cylindrical hole, wherein the tip side centerline of the eccentric block guide pressed by the pressing spring is positioned eccentrically from the centerline of the tip body, and the eccentric block guide is formed rotatably with the tip side thereof inclined relative to the inside wall of the cylindrical hole.

Description

Welding wire guides and welding contact tips

TECHNICAL FIELD The present invention relates to a welding wire guide and a welding contact tip arranged in a welding contact bright tip.

Field background technology

The welding contact tip (hereinafter referred to as “contact tip” or “tip” as appropriate) placed in a conventional torch nozzle is a straight tip with a slightly larger inside diameter than the welding wire at the center of a single tip that has a screw for connection to the torch body. A hole is provided so that when the wire is sent out, the wire is brought into natural contact with the inner wall surface to supply power to the wire. However, in such a contact tip structure, the contact with the wire is a natural contact, so the contact resistance is large with respect to the large power supplied, and the contact state is unstable, so that the arc can be maintained stably. It is difficult to secure. As a result, a large amount of sludge is generated and accumulates in the chip, causing a double arc and preventing welding of the wire. In addition, there was also a problem that the inner diameter of the through-hole was increased due to wear caused by the wear of the inner wall of the through hole due to the spark discharge, and the contact of the wire was increased. If the inside diameter is enlarged and the wire touches, the so-called aim will occur, and defective welding will be generated.

As a countermeasure, the welding wire is pressed against the inner wall of the chip with a pipe-to-leaf spring to prevent power failure due to abrasion at the tip of the wire through-hole and increase durability. For this reason, as shown in FIG. 5, in Japanese Patent Application Laid-Open No. 9-13466, a contact chip is divided into a chip body 31 of high-conductivity material, a high-hardness guide, and a chip cover for holding them. Power is supplied to the welding wire securely at the tip body, and the guide prevents the hole diameter from expanding at the tip. Is stopped. The welding wire S is guided to the chip body through the pipe 46 in the torch joint 40. The pipe 46 is rotated around the support head 45 by the tension of the tension wire disposed so as to cross the through hole 41 from the hole 67 of the torch joint 40, and the through hole 33 of the chip body is formed. As a result, the contact between the welding wire S and the tip body 31 is ensured. pipe

It has been proposed that the rotation angle of 46 can be adjusted by controlling the tension wire tension with an air cylinder or the like so that an appropriate contact state can be obtained.

However, the contact tip proposed in Japanese Patent Application Laid-Open No. 9-1346 / 1991 is divided into a tip body 31, a high hardness guide 35, and a chip cover 36 for holding these. Furthermore, a nozzle that covers the chip body 31

It is composed of 50, a torch joint 40 and a holder.

In the contact tip, a rotatable pipe 46 for guiding the welding wire S and a tension wire arranged to traverse the tip body 31 are arranged. The pipe 46 is pressed against the inner wall of the chip by the tension wire. In order to press the wire against the inner wall of the chip, the pressure of the pipe pressed against the inner wall of the chip is adjusted by the tension of the tension wire, and the number of parts is large and the structure is complicated. Contact chips are large. Therefore, there are many manufacturing processes and cost.

Therefore, in the present invention, a simple structure in which a wire is guided into a cylindrical hole in a contact tip and a cylindrical welding wire guide having a structure in which the wire is not detached, and a stable current can be supplied. It is intended to provide a wire guide and a contact tip for welding.

From the above, the present invention is used with a tip body in which a through hole through which a welding wire passes and a cylindrical hole are formed, and a tip front portion and a tip rear portion are screwed together, and installed in the cylindrical hole. A cylindrical welding wire for guiding the welding wire in a state of contact with the chip body while maintaining the contact state. An eccentric piece guide having a through hole through which a wire passes through the center of the cylinder and a groove formed along an outer periphery near the tip of the cylinder; and a groove fitted on the eccentric piece guide. A mountain-shaped pressing spring that presses the distal end side against the inner wall of the cylindrical hole, wherein the center line of the distal end side of the eccentric top guide pressed by the pressing spring is closer to the center line of the chip body. The welding wire guide is characterized in that the welding guide is eccentric, and the eccentric top guide is configured so that the tip end side is inclined to the inner wall of the cylindrical hole and is rotatably pressed by the pressing spring. Things.

Further, in the present invention, a through hole through which a welding wire penetrates and a cylindrical hole are formed, and a tip front portion and a tip rear portion are used together with a tip body joined by screws, and are installed in the cylindrical hole. A cylindrical welding wire guide for guiding the welding wire to the chip body while maintaining the contact state, wherein the cylindrical port guides the welding wire while pressing the welding wire against the inner wall of the cylindrical hole. And a roller support for rotatably supporting the roller guide at an angle with respect to the center line of the chip. The roller guide is configured to hold a welding wire from the center line of the chip to the cylindrical hole. And a welding wire guide provided so as to press against the inner wall of the welding wire.

The eccentric piece guide has a conical receiving port for guiding the welding wire, a through hole through which the welding wire passes, and a groove with which a pressing spring is pressed against the outer periphery. The pressing spring has a mountain shape and both ends thereof are fixed to the inner wall of the cylindrical hole, and the top of the mountain shape and the groove of the eccentric frame guide are fitted to each other to form a tip of the eccentric frame guide. It is pressed rotatably against the inner wall of the cylindrical hole.

The roller guide is attached at a predetermined angle to the center line of the chip body.

The present invention further provides a tip body in which a through hole through which a welding wire passes and a cylindrical hole are formed, and a tip body and a tip rear portion are connected by screws. A cylindrical welding wire guide for guiding the welding wire to the chip body while maintaining a contact state with the chip main body, wherein the through hole is provided at a front portion of the chip. Is before The diameter of the welding wire guide is larger than the diameter of the welding wire penetrating from the inlet of the conical welding wire connected to the tip side of the cylindrical hole to the tip of the chip body. An eccentric top guide having a through hole formed therein for guiding a welding wire, and a chevron-shaped section which fits into a groove formed in the eccentric top guide and presses the distal end thereof against the inner wall of the cylindrical hole. The center line of the eccentric top guide pressed by the pressing spring is eccentric from the center line of the chip body, and the eccentric top guide pressed by the pressing spring has the cylindrical hole. A contact tip for welding, wherein the welding wire guide is configured to be inclined and rotatably pressed against an inner wall of the welding wire, and further, the welding wire guide has a cylindrical mouthpiece for guiding a welding wire. Do and before A roller supporting portion that rotatably supports the mouth guide with respect to the chip center line and is configured to press the welding wire against the inner wall of the cylindrical hole from the center line of the chip. It is intended to provide a welding contact tip characterized by the following. Brief description of the drawings

FIG. 1 shows a front view of a contact tip for welding according to the present invention.

FIG. 2 shows a first embodiment, and shows a cross-sectional view between A and A in FIG. 1 with a contact tip in a state where a welding wire W has penetrated.

FIG. 3 shows a second embodiment, and FIG. 3 (a) shows a cross-sectional view between A and A in FIG. (B) is a cross-sectional view of the rear part of the chip of (a) taken along the line X--X. (C) shows a front view as seen from the Y direction (upper surface) between Z and Z in (a).

FIG. 4 is a cross-sectional view illustrating a conventional example. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a front view of a welding contact tip 1 of the present invention. The welding contact tip 1 is a torch on the tip end 20 of the tip body 20 and the tip body 20. A mounting screw 6a for mounting on the side is formed.

The chip body 20 is formed of brass, pure copper, zirconium, machinyu, aluminum aluminum, phosphor bronze, conductive ceramic, beryllium copper, and the like, in addition to chromium copper as a good conductive material. The welding wire W is penetrated from the rear end 2b side of the welding contact tip 1 to the front end 2a.

FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1 in a state where the welding wire W has penetrated the inside of the contact chip 1. As shown in the figure, the contact tip 1 is composed of a tip body 20 and a columnar welding wire guide 3. The chip main body 20 is divided into a chip front part 20a and a chip rear part 20b. A male or female screw 6b is provided at the rear end of the chip front portion 20a, and a female or male screw 6c is provided at the tip end of the chip rear portion 20b. The rear part 20b of the chip and the front part 2◦a of the chip are joined together by screws 6b and 6c. In manufacturing the contact tip 1 for welding, the wire guide 3 b for welding is assembled into the cylindrical hole 4 at the rear portion 20 b of the tip body 20, and then the tip side of the rear portion 20 b of the tip body 20 and the tip The chip body 20 is assembled by joining the screws 6b and 6c provided at the rear end of the front part 20a.

The tip body 20 is formed with a cylindrical hole 4 at the rear portion 20b of the tip for passing a welding wire. The welding wire guide 3 is installed in the cylindrical hole 4. At the rear end side of the tip 20b following the tip front 20a side of the welding wire guide 3, a receiving port for the guided welding wire W forms a conical cone 4a. Is provided. Further, a through hole 5 having an inside diameter slightly larger than the welding wire W is formed from the inlet on the tip side of the cone portion 4a to the tip of the chip body 20. A power supply portion 4b is formed at the entrance of the through hole 5 with which the welding wire W contacts. Further, a portion of the tip 2a of the through hole 5 where the welding wire W contacts is a power supply portion 4c. The conical cone portion 4 a can easily guide the welding wire W to be inserted into the through hole 5. Furthermore, the resistance of the contact surface between the welding wire W and the power supply portions 4b and 4c of the tip body 20 is stabilized.

Here, in the first embodiment of the welding wire guide 3 in the present invention, explain about.

FIG. 2 shows a cross-sectional view between A and A in FIG. As shown in the figure, the contact chip 1 is composed of a chip body 20 and a cylindrical welding wire guide 3. The chip body 20 is composed of a chip front part 20a and a chip rear part 20b. A male or female screw 6b is provided at the rear end of the front portion 20a of the chip, and a female or male screw 6c is provided at the front end of the rear portion 20b of the chip. The tip rear part 20b and the chip front part 20a are joined together by screws 6b and 6c.

The tip main body 20 has a cylindrical hole 4 through which the welding wire W is passed at the tip rear portion 20b. The welding wire guide 3 is installed in the cylindrical hole 4. The welding wire guide 3 includes a cylindrical eccentric top guide 14 and a pressing spring 15. The welding wire guide 3 is usually made of elastic metal, but may be made of a material other than metal (for example, hard rubber or the like) as long as it has elasticity.

The eccentric top guide 14 has a reception port 7 formed in a conical mass at the rear end so as to easily receive the welding wire conveyed from the torch side. In addition, the contact opening 7 can reduce the contact resistance of the welding wire W penetrating through the through hole 8 in this conical mass shape. A through hole 8 through which the welding wire W penetrates from the receiving port 7 to the tip of the eccentric piece guide 14, and a groove 9 for receiving the pressing spring 15 near the outer peripheral tip side of the eccentric piece guide 14 (for example, V-shaped or U-shaped grooves) are formed.

The pressing spring 15 is formed of an elastic metal material, and has a substantially “H” -shaped mountain shape, and both ends thereof are fixed and supported on the wall surface of the cylindrical hole 4. The peaks (convex portions) of the ridges of the pressing springs 15 are fitted into the grooves 9 of the eccentric guides 14, and the tip of the eccentric guides 14 is pressed against the inner wall of the cylindrical hole 4. I have.

The tip of the eccentric top guide 14 pressed by the pressing spring 15 is pressed against the inner wall of the cylindrical hole 4. With this pressing, the center of the tip of the eccentric guide 14 shifts from the center line 10 of the chip 20, and the tip of the eccentric guide 14 is pressed by the inner wall of the cylindrical hole 4 and inclined. Become. In this way, the eccentric top guide 14 is pressed by a pressing spring 15 so as to be rotatable and inclined. The welding wire W comes into contact with the power supply sections 4b and 4c with a stable resistance due to the pressure caused by this inclination. The angle of the inclination can be adjusted by changing the pressing force to a different pressing force or by adjusting the pressing force of the pressing spring.

The through-hole 8 of the eccentric top guide 14 and the through-hole 5 of the tip front part 20a in the first embodiment are formed as holes having a diameter enough to allow the welding wire W to pass therethrough. I have. The present welding wire can be applied to various sizes. For example, when the diameter of the welding wire W is 1.0 mm, the inner diameter of the through holes 5 and 8 is 1.5. mm. In the through holes 5 and 8, the welding wire W and the through holes 5 and 8 are in surface contact. Since the welding wire W is always in surface contact with the through holes 5 and 8, the contact resistance is stabilized, so that the fluctuation of the applied voltage is suppressed. Since the welding arc is controlled by constant current, the current is stable and a good arc can be obtained.

Further, the surface of the welding wire W is provided with plating. For example, copper or aluminum plating. If the welding wire W and the welding wire guide 3 are disengaged from the welding wire guide 3 and are rubbed in the cylinder, the plating will be scraped off.

The shaved film or the like closes the through hole 5 and adheres to the power supply portion 4b and the like, causing a double arc and causing a trap in which the welding wire W is welded. In the welding wire guide 3 of the present invention, since the welding wire W passes through the through hole 8 of the eccentric piece guide 14, the welding wire W does not come off from the eccentric piece guide 14. The welding wire can be guided in a stable state. Here, the operation of the welding wire W and the welding contact chip 1 in the first embodiment will be described.

The welding wire W inserted into the cylindrical hole 4 is guided to the cylindrical welding wire guide 3 and is conveyed from the conical receiving port 7 to the through hole 8 of the eccentric piece guide 14. The welding wire W is guided into the through hole 8 in the eccentric guide 14, and is guided to the inner wall of the chip body 20 by the inclination of the eccentric guide 14. At this time, the eccentric top guide 3 is rotated by the resistance of the through hole 8 and the wire W. I do.

The welding wire W conveyed in the direction of the inner wall from the through hole 8 of the eccentric top guide 14 penetrates while contacting the feed part 4 b at the entrance of the through hole 5 from the cone part 4 a of the chip front part 20 a. Proceeding to the hole 5, power is supplied while contacting the power supply portion 4c at the tip 2a of the through hole 5. At this time, the welding wire W is supplied with power, and can be welded by melting the material to be welded by the arc. In this manner, power is reliably supplied by being pressed by the power supply portion 4c at the outlet of the through hole 5. The eccentric guide 14 is rotatably pressed by a pressing spring 15. The welding wire is not necessarily straight, but may be bent due to storage. Therefore, the eccentric top guide 14 rotates due to frictional resistance with the through hole 8 through which the welding wire W is conveyed. By rotating, the resistance between the welding wire W and the through-hole 8 is weakened, the stable conveyance of the welding wire W is facilitated, and the deformation of the through-holes 5, 8 due to wear can be reduced. .

The eccentric top guide of the present invention has a through hole 8, and the welding wire W is conveyed in the through hole 8, so that it does not come off from the welding wire guide 3. It does not get caught in the welding wire guide 3 in the cylindrical hole 4. The welding wire W can be always stably guided.

Further, since the eccentric guide 14 presses the welding wire W near the tip in the cylindrical hole 4, the pressing can be performed for a long time even if the power supply portion 4d is worn. By being able to press for a long time, a stable current can be supplied, and power can be saved.

Next, a second embodiment of the welding wire guide 3 will be described. FIG. 3 shows a cylindrical welding wire guide 3, and FIG. 3 (a) shows a cross-sectional view of the welding tip 1 shown in FIG. (B) is a cross-sectional view of the rear part of FIG. (C) shows a front view as seen from the Y direction (upper surface) between Z and Z in (a).

As shown in the figure, the contact tip 1 is composed of a tip body 20 and a columnar welding wire guide 3b. The chip main body 20 is divided into a chip front part 20a and a chip rear part 20b. This tip front Male or female screw 6b is provided at the rear end of 20a, and female or male screw 6c is provided at the distal end of chip rear portion 20b. The tip rear part 2 Ob and the chip front part 20a are joined together by screws 6b and 6c. In the manufacture of the chip, after assembling the welding wire guide 3b into the cylindrical hole 4 at the rear part 20b of the chip, the tip side of the rear part 20b of the chip and the rear end of the front part 20a of the chip Assemble the chip by connecting the chip front 20a and the chip rear 20b with the screws 6b and 6c provided on the chip.

The tip body 20 has a cylindrical hole 4 formed in the rear portion 20b of the tip for passing a welding wire. The welding wire guide 3 b is installed in the cylindrical hole 4. A conical cone portion 13 is provided at the rear end side of the tip rear part 2 Ob for receiving the welding wire in the tip body to facilitate receiving the welding wire W. The receiving end of the welding wire W forms a conical cone portion 4a at the rear end side of the tip front portion 20a.

A through hole 5 having an inner diameter larger by a predetermined diameter than the welding wire W is formed from the inlet on the tip side of the cone portion 4a to the tip end. A power supply portion 4b is formed at the entrance of the through hole 5 with which the welding wire W contacts. Further, a power supply portion 4c is provided at a portion of the tip 2a of the through hole 5 where the welding wire W contacts. The conical cone portion 4 a can easily guide the welding wire W to be inserted into the through hole 5. Furthermore, the resistance of the contact surface between the welding wire W and the power supply sections 4b and 4c of the tip body 20 is stabilized.

In the second embodiment, the welding wire guide 3 b is composed of a roller guide 16 and a mouth guide support 17. The roller guide support portions 17 are provided at both ends of the mouth guide 16 and are configured to rotatably support the roller guide 16. The roller guide support portion 17 is fixed to the inner wall of the cylindrical hole such that the mouth guide is inclined at a predetermined angle with respect to the center line of the chip body 20. The contact surface between the welding wire and the mouth guide is eccentrically installed closer to the inner wall than the center line of the chip body.

The roller guide 16 is provided with a through hole through which the roller support 17 can pass. The roller support 17 may be passed through the through-hole and both ends may be fixed to the inner wall of the cylinder to rotatably support the mouth guide.

The mouth guide 16 is supported by a support portion 17 fixed to the inner wall of the cylindrical hole 4 and is rotatably installed. The mouth guide 16 presses the welding wire W against the inner wall side of the cylindrical portion while rotating by the contact of the welding wire W. As shown in FIG. 3B, the roller guide 16 is attached at a predetermined angle with respect to the center line of the chip body. Due to this inclination, the contact surface between the welding wire W and the roller guide 16 can move its contact position with respect to the magnitude or bending of the welding wire W. By moving the contact position, it is possible to reduce and stabilize the resistance of the welding wire W to contact portions such as the through holes 5 and 8 and the power supply portion on the inner wall of the chip. In addition, since the contact surface is movable, there is no wear at only one place. Further, since the roller guide is rotatable, the conveyance of the welding wire W is performed while rotating, so that there is little resistance to contact with the mouth guide. Therefore, stable conveyance of the welding wire W becomes possible.

Then, as shown in FIG. 3 (c), the contact surface of the opening guide 16 presses the guided welding wire W against the inner wall of the cylindrical hole 4 from the center line of the tip 20a and the through hole 5. The center line is set at a position shifted from the center line.

Here, the operation of the welding wire W and the welding contact chip 1 in the second embodiment will be described.

The welding wire W inserted into the cylindrical hole 4 advances from the receiving port 13 to the roller guide 16. The welding wire W is pressed by the contact surface of the roller guide 16 and guided toward the inner wall of the cylindrical hole 4.

At this time, even if the tension of the welding wire W changes due to the transfer resistance or bending of the welding wire W, the contact surface moves along the slope of the inclined roll guide 16 so that the tension can be adjusted. The welding wire W can be conveyed without giving a temporary strong tension or strong resistance to the contact surface of the chip.

Welding from roller guide 16 toward inner wall of cylindrical hole 4 of chip body 20 The wire for use W is guided by the conical cone portion 4 a provided on the tip side of the cylindrical hole 4 and advances to the through hole 5 while contacting the power supply portion 4 b on the inner wall of the chip body 20. At this time, the welding wire W is fed and melted by the arc to perform welding.0

Since the roller guide 16 has a roller shape and a predetermined length, the welding wire W does not come off from the mouth guide 16. It does not get caught by the welding guide 3 b in the cylindrical hole 4. The welding wire W can always be guided stably.

Further, since the roller guide 16 presses the welding wire W near the tip in the cylindrical hole 4, the pressing can be performed for a long time even if the power supply portion 4d is worn. By being able to press for a long time, a stable current can be supplied and power can be saved.

As described above, the present invention has a columnar structure in which the welding wire W penetrating through the inside of the welding contact tip 1 does not come off from the welding wire guide 3 installed in the tip body 20, and is small and simple. A welding wire guide 3 and a welding contact tip 1 having a simple structure and capable of supplying a stable current can be provided.

Furthermore, since the welding wire guide 3 contacts the welding wire W and presses it near the tip of the chip while rotating, the pressing can be performed for a long time even if the power supply portion 4d is worn. By being able to press for a long time, a stable current can be supplied and power can be saved. Further, the durability of the chip body has been further increased. Industrial applicability

The present invention has made it possible to use a welding wire guide and a welding contact tip having an eccentric top guide and a roller guide arranged in the welding contact tip.

Claims

The scope of the claims

1. A through hole through which the welding wire penetrates and a cylindrical hole are formed, and the front part of the chip and the rear part of the chip are used together with the chip body that is screwed together. Cylindrical welding wire guide for guiding the welding wire to the chip body while maintaining the contact state,

An eccentric guide having a through hole through which a welding wire passes through the center of the cylinder and a groove formed along the outer periphery near the tip of the cylinder;

A mountain-shaped pressing spring that fits into the groove of the eccentric piece guide and presses the distal end side against the inner wall of the cylindrical hole.

The center line on the distal end side of the eccentric guide guided by the pressing spring is eccentric from the center line of the chip body, and the eccentric top guide is rotatable with the distal end inclined to the inner wall of the cylindrical hole. A welding wire guide configured to be pressed by the pressing spring.

2. A through hole through which the welding wire penetrates and a cylindrical hole are used, and the front part of the tip and the rear part of the chip are used together with the chip body that is screwed together. Cylindrical welding wire guide for guiding the welding wire to the chip body while maintaining the contact state,

A cylindrical roller guide for guiding the welding wire while pressing it against the inner wall of the cylindrical hole;

An opening for supporting the roller guide so as to be rotatable at an angle with respect to the chip center line;

Wherein the roller guide is configured to press the welding wire against the inner wall of the cylindrical hole from the center line of the tip, and the welding wire guide (

3. The eccentric guide has a conical receiving hole for guiding the welding wire, a through hole through which the welding wire passes, and a groove on the outer periphery of which the pressing spring is pressed. The welding wire guide according to claim 1, wherein

4-The pressing spring has a mountain shape and both ends thereof are fixed to the inner wall of the cylindrical hole, and the top of the mountain shape fits with the groove of the eccentric guide and the eccentric top guide is fitted. 2. The welding wire guide according to claim 1, wherein the tip of the guide is pressed against the inner wall of the cylindrical hole, and the eccentric guide is rotatably pressed.

5. The welding wire guide according to claim 2, wherein the mouth guide is attached at a predetermined angle with respect to a center line of the chip body.

6. A through hole through which the welding wire penetrates and a cylindrical hole are formed, and a tip body in which the tip front and the tip rear are screwed together, and the welding wire in a state of being installed in the cylindrical hole. A welding contact tip comprising a cylindrical welding wire guide for guiding while maintaining a contact state with the tip body,

The through-hole at the front of the tip has a larger diameter than the welding wire penetrating from the inlet of the conical welding wire connected to the tip side of the cylindrical hole to the tip of the tip body,

The welding wire guide has an eccentric top guide having a through hole formed in the center of a cylinder to guide the welding wire;

A mountain-shaped pressing spring that fits into a groove formed in the eccentric piece guide and presses a tip end thereof against an inner wall of the cylindrical hole,

The center line on the tip side of the eccentric coma guide is eccentrically provided on the inner wall from the center line of the tip so as to press the welding wire against the inner wall of the cylindrical hole. Contact tip for welding.

7. A tip body formed by a good conductive material, a through hole through which a welding wire passes and a cylindrical hole are formed, and a tip front portion and a tip rear portion are connected by screws, and the tip body is formed at the tip rear portion. A welding contact tip comprising a cylindrical welding wire guide for guiding the welding wire in a state of being placed in the cylindrical hole while maintaining a contact state with the chip body. The through hole at the front of the tip has a diameter larger than the diameter of a welding wire penetrating from the conical inlet port connected to the tip side of the cylindrical hole to the tip of the tip body, The welding wire guide comprises: a cylindrical roller guide for guiding the welding wire;

An opening for supporting the roller guide so as to be rotatable at an angle with respect to the center line of the chip;

The contact tip for welding, wherein the mouth guide is configured to press a welding wire against an inner wall of the cylindrical hole from a center line of a tip.