KR101557364B1 - Welding tip - Google Patents

Abstract

The present invention relates to a welding tip and, more specifically, to a welding tip, which comprises a space part and a penetrating part inside a main body of the welding tip, and thus the main body and a member inserted in the main body are barely transformed even at high temperature. Moreover, the welding tip prevents cutting chips and foreign substances from being piled up inside the main body and thus allows a wire to be delivered smoothly. In addition, the present invention prevents welding from being quitted, thereby increasing productivity and reducing unit cost of products.

Description

Welding Tip

The present invention relates to a welding tip, in which a space portion and a penetration portion are formed in a main body of a welding tip so that a member inserted into the main body and the main body is hardly deformed even at a high temperature and cutting substances and foreign matter are not accumulated in the main body, And to a welding tip in which the productivity is improved and the cost of the product is lowered because the welding is not interrupted.

Generally, arc welding using a gas supplies gas such as carbon dioxide, argon, and helium while supplying power to the wire and the welding product (base material), and at the same time, feeding the wire (solid-type copper cord) The welding is performed by using an arc generated between the electrodes.

The welding tips (Contact tip: Co2, MAG, MIG) used for such arc welding are made of a copper material which is a conductive material, and a wire passage for passing the welding wire is formed at the center of the shaft member.

In the welding tip as shown in JP 1996-0215855, the ceramics cylindrical body is press-fitted into the upper end of the base metal member, and the tip end metal member is press-fitted into the fitting portion so that these three members are integrated.

The welding tip shown in FIG. 5 of JP 2002-0011578 is made of chrome, copper alloy or the like, and an annular member such as ceramic having abrasion resistance is placed on the top of the contact chip body.

A tapered surface is formed on one side of the ceramic annular member and an axial gap is formed between the annular member of the ceramic and the contact chip body for the production error and thermal expansion absorption.

A contact tip as shown in JP 2009-0248131 has a receiving portion formed at the outlet portion of the feed hole and inserts the reinforcing member.

The reinforcing member made of a high-hardness material such as ceramics is provided with a notched portion from which the outer edge portion of the upper end is removed.

At this time, a step of applying a pressing force to the reinforcement member inserted into the accommodating portion toward the bottom side of the accommodating portion is performed, and the reinforcing member is fixed to the accommodating portion by plastic deforming the upper end portion of the contact tip so as to surround the notch portion.

JP 1996-0215855 and JP 2009-0248131 discloses a technique in which a ceramic member is placed on the top of the main body or a member made of two materials adjacent to each other while being different from the material of the main body, Located.

In the conventional technique, the conductivity of the welding tip is not good. In the case of welding, there is wear resistance generated when the welding wire passes through the inside of the main body, and high temperature applied to the top of the main body. The wire is out of the position to be welded, welding defect occurs, and cutting particles and foreign matter are formed during the welding, the wire is piled up in the hole through which the wire is fed, and the wire is not smoothly fed out, · Increase in unit price and lower productivity of welding products.

In JP-A 2002-0011578, the conventional technique as shown in Fig. 5 causes welding between the contact chip body and the welding wire due to the axial clearance.

JP 1996-0215855 JP 2002-0011578 JP 2009-0248131

SUMMARY OF THE INVENTION The present invention is conceived to solve the above problems, and it is an object of the present invention to provide a welding tip, in which a space portion and a penetration portion are formed inside a body of a welding tip, The present invention relates to a welding tip in which cutting and foreign substances are not accumulated in a main body, smooth delivery of a wire is achieved, and welding is not interrupted, thereby increasing productivity and reducing the cost of a product.

In order to attain the above object, the welding tip according to claim 1 of the present invention includes a main body having a first through hole formed in the longitudinal direction, wherein the main body has a hole (150) The gas passing through the outer circumferential surface of the main body passes through the hole (150) because the first through hole communicates with the space outside the main body.
The welding tip according to claim 2 of the present invention further includes an insertion member in which a second through hole 360 is formed in a longitudinal direction and a part or the whole of which is located inside the body, The members are different from each other in material, the one side of the second through hole 360 communicates with the first through hole, and the other side of the second through hole 360 communicates with the space outside the main body .
In the welding tip according to the third aspect of the present invention, a space is formed in the body so that cuttings and foreign substances gathered in the space can be discharged to the outside through the hole (150), and one side of the space And is communicated with the first through-hole.
In the welding tip according to claim 4 of the present invention, a depression is formed in a part of the center of the insertion member.
In the welding tip according to claim 5 of the present invention, the insert member is any one of alloy steel, which is one of tungsten, cemented carbide, nickel, and chrome, and artificial diamond.

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According to the welding tip of the present invention as described above, the following effects can be obtained.

When one of the tungsten alloy, cemented carbide, molybdenum alloy, nickel alloy, chromium alloy, artificial diamond, ceramic is used for the insertion member in the welding tip with good abrasion resistance, heat resistance and conductivity, Long-time welding is possible.

The first inserting member may be made of an alloy steel such as a cemented carbide alloy, a tungsten alloy, a molybdenum alloy, a nickel alloy, a chromium alloy, or the like having good conductivity, abrasion resistance, and heat resistance and the second inserting member may be made of a silver tungsten alloy, When the alloy is used, the deformation of the metal used for the insert member is reduced, thereby improving the welding performance.

A high strength ceramic or artificial diamond is used for the first insertion member and a second insertion member in which the portion to which the wire is fed out is selected to be a silver tungsten alloy or a copper tungsten alloy which is a metal having high conductivity The performance of the welding tip is improved.

When the first inserting member is made of ceramic or artificial diamond and the second inserting member in which the wire is fed out from the body is used, the use of silver tungsten alloy or copper tungsten alloy, which is a metal with high conductivity, The performance is improved.

The taper formed in the insertion member has an effect of preventing a large difference in thermal expansion between the main body and the insertion member due to a high temperature generated during welding.

When the insert member having the stepped portion is press-fitted into the main body and then the main body is subjected to the drawing process, a part of the main body moves to the depressed portion and is firmly brought into close contact with the insertion member.

When cutting and foreign substances generated while the wire passes through the through hole are received in the space portion and the cutting and foreign substances gathered in the space portion are discharged through the penetration portion, the cutting effect and the foreign matter are not accumulated in the body, have.

The space portion absorbs the difference in thermal expansion generated between the main body and the insertion member due to the high temperature generated during welding at the thickness portion of the main body outside the space portion so that the insertion member is not easily separated from the main body due to the difference in thermal expansion.

The penetrating portion absorbs a difference in thermal expansion that appears between the main body and the insertion member due to the high temperature generated during welding, thereby preventing the insertion member from being easily separated from the main body.

In addition, a cooling effect is generated by the gas passing through the penetrating portion of the outer circumferential surface of the body during welding, so that the high temperature to be transmitted to the alloy steel is reduced, and deformation of the insert member is reduced.

In other words, since the wire is smoothly fed out of the welding tip 500 without any interference, it is not necessary to replace the welding tip even if the welding is performed for a long time, thereby saving time and cost as well as producing a good quality welding product.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view and partial enlarged view of an insert member of an alloy steel of the welding tip of the present invention. Fig.
Fig. 2 is an embodiment in which the insertion member of the welding tip of the present invention is made of one material of alloy steel and silver tungsten alloy / copper tungsten alloy.
Fig. 3 is an embodiment in which the insertion member of the welding tip of the present invention is made of one of ceramic and artificial diamonds and one of silver tungsten alloy and tungsten alloy.
Fig. 4 shows an embodiment in which the welding tip of the present invention is forged.
Fig. 5 shows an embodiment in which a drawing method is applied to a welding tip into which a stepped insert member is press-fitted.
6 is a partially enlarged view of Fig.
FIG. 7 is an exploded sectional view of FIG. 1. FIG.
Fig. 8 is an embodiment in which the drawing method is applied to Fig.
Fig. 9 is an embodiment of the drawing method shown in Fig.

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

For reference, the same components as those of the conventional art will be described with reference to the above-described prior art, and a detailed description thereof will be omitted.

In the present invention, alloy steel (tungsten, carbide, molybdenum, nickel, chrome, etc.) having good wear resistance, heat resistance, and conductivity is used in order to eliminate deformation of the upper end 160 of the main body 100, A high strength ceramic artificial diamond is used as the insertion member 300. [

The copper used as the material for the conventional welding tip 500 has an operating time of 1 to 10 hours or more. Nickel alloy is 10 to 30 hours. The molybdenum alloy is 20 to 50 hours. The chromium alloy is used for 30 to 60 hours · Tungsten alloy is 50 ~ 70 hours · Cemented carbide is 80 ~ 120 hours · Ceramic is 100 ~ 240 hours · Artificial diamond is more than 100 ~ 500 hours (Depending on working conditions and environment, use time can be shortened and extended) Alloy steel, ceramic and artificial diamonds can last a long time without stopping the welding.

============= Example 1 =====================

1, a welding tip 500 according to a preferred embodiment of the present invention includes a main body 100 having a first through hole 130 formed in a longitudinal direction thereof, The body 100 and the insertion member 300 are made of materials different from each other and the second through holes 360 are formed in the body 100, And the other side of the second through hole 360 communicates with a space outside the main body 100. A hole is formed in the main body 100 so that the first through hole 130 130 and the outer space of the main body 100 communicate with each other.

The main body 100 is composed of a coupling part 115, a first main body 120, and a second main body 125.

The first through hole 130 formed in the main body 100 is composed of a wire delivery port 130a and a wire passage 130b.

One side of the wire delivery port 130a is connected to the lower end 110 of the main body 100 and the other side is connected to the wire passage 130b.

The inner diameter of the wire delivery port 130a decreases from the lower end 110 of the main body 100 toward the longitudinal direction, and tapered when the end surface of the wire delivery port 130a is cut as shown in FIG.

One side of the wire passage 130b having a constant circular cross section is connected to the other side of the wire delivery port 130a and the other side is connected to the other side of the space portion 140. [

The fastening portion 115 is formed in a cylindrical shape and has threads on its outer peripheral surface.

The first body 120 has a polygonal outer diameter larger than the outer diameter of the coupling part 115, and one side of the first body 120 is connected to the coupling part 115.

The second body 125 extends in a curved or straight line shape with the first body 120.

The outer diameter of the second body 125 is smaller than the outer diameter of the first body 120.

A through hole 150 is formed in the second body 125 to allow the first through hole 130 to communicate with the outer space of the main body 100.

The penetrating portion 150 is linear in the side view and radially in the center of the main body 100 when viewed from the front side.

Also, 3 to 6 pieces are formed to be spaced from each other according to the characteristics of the welding product and the diameter of the wire (0.6 to 1.6 mm).

The penetration part 150 is formed so that the extension of the center and the longitudinal direction of the main body 100 are inclined at an acute angle.

One side of the penetrating part 150 is connected to the space surface 145 to be described later and the other side is connected to the outer circumferential surface of the main body 100 to allow the external space of the main body 100 and the inside of the main body 100 to communicate with each other.

The body 100 has a space 140 through which the first and second through holes 130 and 360 and the through hole 150 communicate with the external space of the main body 100.

The space 140 formed with a maximum space inside the main body 100 is connected to the first through hole 130 and the second through hole 360 on one side.

The space portion 140 has an area of a surface perpendicular to the longitudinal direction being larger than an area of a surface perpendicular to the longitudinal direction of the first through hole 130.

The space portion 140 is formed concavely in a curved shape when viewed from the side.

The space portion 140 serves to prevent the difference in thermal expansion between the main body 100 and the insertion member 300 from occurring due to the penetration portion 150, the space contact portion 305 and the tapered portion 310.

The other side of the space surface (145) having a concave shape in section is in contact with one side of the insertion member (300).

The diameter of the cross-section when viewing the space surface 145 from the front is 0.6 to 2.0 mm.

Inside the main body 100, an insertion space 105 in which an insertion member 300 to be described later is located is formed.

The contact portion 155 of the insertion space 105 contacts the contact peripheral surface 320 of the insertion member 300 to be described later.

The insertion member 300 has a cylindrical shape with an inner surface penetrating.

The insertion member 300 has a through-hole inner surface 350 through which the wire contacts the second through hole 360.

One side of the penetrating inner surface 350 is connected to a space contact portion 305 to be described later, and the other side is connected to a top contact portion 340 to be described later.

The insertion member 300 includes a contact peripheral surface 320, a tapered portion 310 having a tapered outer peripheral surface at one side thereof, a space contact portion 305 connected to the space surface 145, a top contact portion 340, (330).

The tapered portion 310 is connected to the inner surface of the main body 100 and the penetrating portion 150.

The tapered portion 310 functions to facilitate the insertion of the insertion member 300, in which a portion of the wire 100 is discharged from the main body 100, to the main body 100.

The inner surface of the main body 100 to which the tapered portion 310 touches serves as a stopper for preventing the insertion of the insertion member 300 into the main body 100 when the insertion member 300 is pressed into the main body 100 more than necessary.

The space contact portion 305 constitutes a part of the space surface 145 when the insertion member 300 is pushed into the main body 100.

The press-fit portion 330 is machined to form 45 degrees with the upper end 160.

The upper contact portion 340 is exposed to the outside, and the press-fit portion 330 is wrapped around the upper portion 160.

One end of the upper contact portion 340 is connected to the penetrating inner surface 350 and the other end is connected to the press-in portion 330.

One side of the contact peripheral surface 320 is connected to the tapered portion 310 and the other side is connected to the press-fit portion 330.

As the material of the insertion member 300, one of alloy steel (tungsten, carbide, molybdenum, nickel, chromium, etc.) and artificial diamond ceramics is used in accordance with the characteristics of the product to be welded.

As shown in FIG. 7, the upper end 160 of the main body 100 has an inner peripheral surface and an outer peripheral surface formed at right angles, and is deformed into a shape that is curled toward the center of the main body 100 through forging.

Forging is applied to all embodiments of the present invention.

The structure of the main body 100 of Embodiment 1 is the same in all embodiments.

============= Example 2 =====================

In order to solve the problem of deformation of the upper end of the main body 100 due to the high temperature generated during welding, the second embodiment uses two different materials for the insertion member 300 as shown in FIG. 2, The member 300 is composed of a first insertion member 300a and a second insertion member 300b.

The first insertion member 300a is located near the first through hole 130 and has a longer length in the longitudinal direction than the second insertion member 300b.

The second insertion member 300b is located adjacent to the first insertion member 300a.

The first insertion member 300a selects one of tungsten alloy, cemented carbide, molybdenum alloy, and nickel alloy alloy steel, and the second insertion member 300b selects one of silver tungsten alloy and copper tungsten alloy.

============= Example 3 =====================

Embodiment 3 is similar to Embodiment 2 in that the insertion member 300 is made of two different materials.

As shown in FIG. 3, the first insertion member 300c is located near the first through hole 130 and has a shorter length in the longitudinal direction than the second insertion member 300b.

The second insertion member 300b is located adjacent to the first insertion member 300a.

The first insertion member 300c selects one of the ceramic artificial diamonds and the second insertion member 300b selects one of silver tungsten alloy and tungsten alloy.

============= Example 4 =====================

As shown in FIGS. 5 and 6, the fourth embodiment prevents the insertion member 300 from being detached from the main body 100 due to deformation of the upper end 160 due to high temperature, which is a problem of the forging method.

The recessed portion 321 is formed in the insert member 300 made of one material by stepping.

The depressed portion 321 formed in a part of the center of the insertion member 300 is composed of the first · 2 · 3 depressions 321a, 321b and 321c.

The second depressed portion 321b has a smaller outer diameter than the first and second depressed outer surfaces 322a and 322b and a straight shape parallel to the depressed outer surface 322 when viewed from the side.

The first depressed portion 321a connects the first depressed outer surface 322a and the second depressed portion 321b and the third depressed portion 321c connects the second depressed outer surface 322b and the second depressed portion 321b, Lt; / RTI >

The depressed portion 321 is formed while surrounding the insertion member 300 in a circular shape.

The first and second concave external surfaces 322a and 322b are linear in a side view.

A step of 10% is formed in the center of the insertion member 300 to be placed on the main body 100, and the main body 100 is press-fitted.

A space is formed between the second depressed portion 321b and the main body 100 due to the difference in outer diameter between the depressed outer surface 322 and the second depressed portion 321b.

After the insert member 300 is stepped, the main body 100 is drawn.

In the drawing process, the main body 100 on which the stepped insertion member 300 is placed is forced to pass through a die having an inner diameter smaller than the outer diameter of the main body by 15% or more.

Then, a part of the main body 100 fills the space, and the main body 100 strongly contacts the insertion member 300.

============= Example 5 =====================

In Embodiment 5, as shown in FIG. 8, the insertion member 300 is composed of first and second insertion members 300a and 300b using two different materials.

The length of the first insertion member 300a in the longitudinal direction is longer than that of the second insertion member 300b.

The welding tip 500 of the second embodiment in which the insertion member 300 is placed is stepped and then subjected to a drawing process.

A depression 321 having the same shape as that formed in the fourth embodiment is formed in the central portion of each of the first and second insertion members 300a and 300b through stepped processing.

That is, grooves are formed in the outer circumferential surfaces of the first and second insertion members 300a and 300b by stepped machining.

The main body 100 is strongly adhered to the depressions 321 formed in the first and second insertion members 300a and 300b by drawing the main body 100 in the same manner as in the fourth embodiment.

============= Example 6 =====================

In Embodiment 6, as shown in FIG. 9, the insertion member 300 is composed of first and second insertion members 300a and 300b using two different materials.

At this time, the length of the second insertion member 300b in the longitudinal direction is longer than that of the first insertion member 300c.

The welding tip 500 of the third embodiment in which the insertion member 300 is placed is stepped and then subjected to a drawing process.

Since the material used for the second insertion member 300b is a material that is easier to process than the first insertion member 300c, the depression 321 is formed only in the second insertion member 300b.

Since the number of depressions 321 is the same as that of the fourth embodiment, the degree to which the insertion member 300 is fixed to the main body 100 will be the same as that of the fourth embodiment.

A depression 321 having the same shape as that formed in the fourth and fifth embodiments is formed in the central portion of the second insertion member 300b through stepped processing.

The first insertion member 300c has a flat surface having no groove on the outer circumferential surface and the second insertion member 300b has a groove or depression 321 formed at the center of the outer circumferential surface.

After stepwise machining of the insertion member 300, the main body 100 is drawn as in the fourth embodiment.

The welding tip 500 according to the present invention having the structure described above forms the first through hole 130, the space portion 140, and the penetration portion 150 in the main body 100.

When the insertion member 300 having one or two different materials is tapered and inserted into the main body 100 after the second through hole 360 is formed and positioned in the insertion space 105 of the main body 100 , One side of the insertion member (300) is brought into close contact with the inner surface of the main body (100).

Thereafter, the upper end 160 is plastically deformed through forging.

Therefore, the taper formed on the insertion member 300 has an effect of preventing a large difference in thermal expansion between the main body 100 and the insertion member 300 due to the high temperature generated during welding.

The space portion 140 receives cuttings and foreign substances generated when the wire passes through the first and second through holes 130 and 360 and cuts and foreign substances gathered in the space portion 140 are passed through the through portion 150 So that the cutting powder and the foreign matter are not accumulated in the main body 100, so that the wire can be smoothly fed out.

The space portion 140 absorbs the difference in thermal expansion between the main body 100 and the insertion member 300 due to the high temperature generated during welding at the thickness of the main body 100 outside the space portion 140.

That is, the insertion member 300 is not easily separated from the main body 100 due to a difference in thermal expansion between the insertion member 300 and the main body 100.

The penetration part 150 absorbs a difference in thermal expansion occurring between the main body 100 and the insertion member 300 due to a high temperature generated during welding so that the insertion member 300 is not easily separated from the main body 100.

In addition, a cooling effect is generated by the gas passing through the penetration portion 150 of the outer circumferential surface of the main body 100 during welding, so that the high temperature transmitted to the insertion member 300 is reduced and the deformation is reduced.

As in Embodiment 1, if one of the alloy steel (tungsten, carbide, molybdenum, nickel, chrome, etc.) or diamond (artificial) ceramic is used for the insert member 300, good performance can be used for a long time.

When one of the first insertion members 300a and 300c is made of an alloy steel and the second insertion member 300b is made of a silver tungsten alloy or a tungsten alloy as in Embodiment 2, 300) is reduced.

The first insertion members 300a and 300c may be made of ceramic or artificial diamond and the second insertion member 300b in which the wire is to be fed out from the body 100 may be a metal having a high conductivity If the tungsten alloy or the tungsten alloy is selected, the conductivity of the welding tip 500 is increased and the performance is improved.

A part of the main body 100 moves to the depressed portion 321 and the main body 100 and the insertion member 300 are moved in the drawing process after the stepped insertion member 300 is press- It is possible to completely prevent the insertion member 300 from being separated from the main body 100 by the step formed on the insertion member 300. [

When the depression 321 is formed in each of the first and second insertion members 300a and 300b as in the fifth embodiment, unlike the fourth embodiment, one depression 321 is formed in the insertion member 300, This will increase to four.

In other words, since the main body 100 is caught by the end of the insertion member 300, the insertion member 300 can be more securely fixed to the main body 100 than in the fourth embodiment.

That is, according to the present invention, since the wire is fed smoothly without any interference from the welding tip 500, there is no need to replace the welding tip even if the welding is performed for a long time, .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be apparent to those skilled in the art.

** Explanation of key codes **
100: main body 105: insertion space
110: lower end 115: fastening portion
120: first main body 125: second main body
130: first through hole 130a: wire delivery port
130b: wire passage 140:
145: space surface 150:
155: contact portion 160: top
300: insertion member 300a, 300c: first insertion member
300b: second insertion member 305: space contact portion
310: tapered portion 320: contact peripheral surface
321: depression 321a: first depression
321b: second depression part 321c: third depression part
322: depression external surface 322a: first depression external surface
322b: Second concave outer surface 330:
340: upper contact portion 350: penetrating inner surface
360: second through hole 500: welding tip
A: longitudinal direction

Claims (5)

And a body having a first through hole formed in the longitudinal direction,
A hole (150) is formed in the body,
Wherein the first through hole communicates with the space outside the body by the hole (150), so that gas passing through the outer circumferential surface of the body passes through the hole (150). The method according to claim 1,
Further comprising an insertion member in which a second through hole 360 is formed in the longitudinal direction and a part or the whole of the second through hole 360 is located inside the body,
Wherein the main body and the insertion member are made of different materials,
Wherein one side of the second through hole 360 communicates with the first through hole and the other side of the second through hole 360 communicates with a space outside the main body. The method according to claim 1 or 2,
A space is formed in the main body to allow cuttings and foreign substances collected in the space to be discharged to the outside through the hole 150,
And one side of the space portion communicates with the first through hole. The method of claim 2,
And a depression is formed in a part of a center portion of the insertion member. The method according to claim 2 or 4,
Wherein the insert member is one of an alloy steel of any one of tungsten, cemented carbide, nickel or chrome, and artificial diamond.

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