KR102365406B1 - Welding torch - Google Patents

Abstract

The present invention relates to a welding torch, which may comprise: a torch body; a first tip unit formed in the torch body and discharging a first welding wire to the outside of the torch body to generate an arc in a welding base material; a second tip unit formed on the side of the first tip unit in the inside of the torch body, and discharging a second welding wire to the outside of the torch body to generate the arc in the welding base material; and a gas lens unit at least a portion of which is formed in a cylindrical shape inside the torch body, in which a penetration unit is formed so that the first tip unit and the second tip unit are penetrated and fixed, and in which a protection gas flow path is formed so as to spray a protection gas supplied from an external protection gas supply unit to the front of the torch body. An objective of the present invention is to provide the welding torch capable of stabilizing volume transfer and improving welding quality.

Description

Welding torch

The present invention relates to a welding torch, and more particularly, to a welding torch used for fusion bonding of various materials such as metal.

In general, in order to combine two or more steel materials and process them into a product of a required shape, a welding method in which a base material or a separate molten member is melted in a connection part of the machining base material to join other steels is the most widely used.

Welding consists of arc welding in which heat generated by arc discharge is used for fusion welding, gas welding in which fusion welding is performed using oxygen and acetylene mixed gas, friction welding using frictional heat generated from the contact surface by relatively rotating the base materials against each other, There are electron beam welding that forms a high-speed electron beam in a vacuum and uses the energy possessed by the electron flow as a welding heat source, and laser beam welding that amplifies and welds light having the same phase with a single wavelength.

Among these welding methods, Gas Metal Arc Welding (GMAW), which uses a consumable electrode, feeds a consumable electrode wire, which acts as a filler metal, to the molten pool at a constant speed while generating an arc between the wire and the welding target through an electric current. It is a welding method that makes it happen.

At this time, gas metal arc welding uses an uncoated metal welding rod, which is a consumable electrode, unlike gas tungsten arc welding, which uses a tungsten rod, which is a non-consumable electrode. We want to improve welding quality by protecting it from

The torch used in the conventional gas metal arc welding method has a problem in that the welding quality is not improved as expected because the protective gas does not flow stably in front of the torch when the protective gas is sprayed, and the protective gas is heated during welding. Deformation may occur in the diffuser that supplies , and there is a problem in that a protective gas must be separately supplied to each electrode when using a tandem electrode.

The present invention is to solve various problems including the above problems, and by applying a gas lens part having a protective gas flow path formed therein to stabilize the flow of protective gas, a welding torch capable of stabilizing volume transfer and improving welding quality is to provide. However, these problems are exemplary, and the scope of the present invention is not limited thereto.

A welding torch according to the spirit of the present invention for solving the above problems, the torch body; a first tip portion formed in the torch body and discharging a first welding wire to the outside of the torch body to generate an arc in the welding base material; a second tip portion formed on the side of the first tip portion in the inside of the torch body, and discharging a second welding wire to the outside of the torch body to generate an arc in the welding base material; and at least a portion is formed in a cylindrical shape inside the torch body, and a penetration part is formed so that the first tip part and the second tip part are penetrated and fixed, and a protective gas supplied from an external protective gas supply part of the torch body It may include; a gas lens unit in which the protective gas flow path is formed to be sprayed to the front.

In addition, according to the present invention, the protective gas flow path portion, the protective gas inlet portion formed by being connected to one surface of the gas lens portion through one hole so that the protective gas flows; a protective gas outlet formed by being connected to the other surface of the gas lens part through a plurality of holes so that the protective gas is sprayed; and a distribution flow path formed to distribute the protective gas from one of the protective gas inlets to the plurality of protective gas outlets.

In addition, according to the present invention, the protective gas inlet may be formed on a side surface of the gas lens unit to be connected to the protective gas supply unit to the outside of the gas lens unit, and may be connected to at least a portion of the distribution flow path inside the gas lens unit. there is.

In addition, according to the present invention, the protective gas inlet is formed on the upper surface of the gas lens part, is connected to the protective gas supply part to the outside of the gas lens part, and can be connected to at least a part of the distribution passage part inside the gas lens part. there is.

In addition, according to the present invention, one side is connected to the protective gas inlet extending to the center of the gas lens unit, and the other side is distributed into a plurality of flow passages and a diffusion passage portion formed to be radially connected to the distribution passage portion; may include more.

In addition, according to the present invention, the through portion may include: a first through hole portion to which the first tip portion is fixed; and a second through-hole portion to which the second tip portion is fixed, wherein the protective gas flow path portion may be formed to surround the through portion around the through portion.

In addition, according to the present invention, the gas lens support portion which protrudes to the inside of the torch body at the upper and lower positions of the gas lens unit to fix the gas lens unit; may further include.

In addition, according to the present invention, the gas lens unit, the outer diameter of at least one section in the longitudinal direction is formed to be larger, the stepped portion is formed so that the torch body is inserted; includes, the at least one section of the gas lens section may be formed on the outside of the torch body.

According to the welding torch according to the present invention, when using the tandem electrode, it is possible to supply the protective gas from one protective gas supply part, maintain the insulation between the tandem electrodes, and prevent deformation of the electrode due to heat generated during the process. It has the effect of stabilizing the volume transfer and improving the welding quality by stabilizing the flow of the protective gas and enabling excellent welding quality with a lower gas flow rate than before. The scope of the present invention is not limited by these effects.

1 is a view showing a welding torch according to an embodiment of the present invention.
2 is a perspective view showing a gas lens unit according to an embodiment of the present invention.
3 is a cross-sectional view illustrating the gas lens unit of FIG. 2 .
FIG. 4 is a bottom view showing the gas lens unit of FIG. 2 .
5 is a perspective view showing a gas lens unit according to another embodiment of the present invention.
6 is a perspective view showing a gas lens unit according to another embodiment of the present invention.
7 is a view showing a welding torch according to another embodiment of the present invention.
8 (a) and 8 (b) are photographs comparing the gas flow of the welding torch to which the conventional gas stove part is not applied and the welding torch to which the gas stove part of the present invention is applied.
9 is a graph showing the porosity of a welding part using a conventional welding torch.
10 is a graph showing the porosity of a welding part using a welding torch according to an embodiment of the present invention.

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

Examples of the present invention are provided to more completely explain the present invention to those of ordinary skill in the art, and the following examples may be modified in various other forms, and the scope of the present invention is as follows It is not limited to an Example. Rather, these embodiments are provided so as to more fully and complete the present disclosure, and to fully convey the spirit of the present invention to those skilled in the art. In addition, in the drawings, the thickness or size of each layer is exaggerated for convenience and clarity of description.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings schematically illustrating ideal embodiments of the present invention. In the drawings, variations of the illustrated shape can be envisaged, for example depending on manufacturing technology and/or tolerances. Accordingly, embodiments of the spirit of the present invention should not be construed as limited to the specific shape of the region shown in the present specification, but should include, for example, changes in shape caused by manufacturing.

In the welding method, one welding target portion and at least a portion of the other welding target portion are disposed to overlap each other. Here, the region where the welding target portion and the other welding target portion overlap each other may be widened or narrowed according to welding conditions. The welding target portion and the other welding target portions may be disposed to be spaced apart from each other without overlapping within a welding range, or may be disposed to be in contact with each other.

1 is a view showing a welding torch according to an embodiment of the present invention.

First, as shown in FIG. 1 , the welding torch according to an embodiment of the present invention largely includes a torch body 100 , a first tip part 200 , a second tip part 300 , and a gas lens part 400 . can do.

The torch body 100 has a first tip part 200 , a second tip part 300 , and a gas lens part 400 formed therein. At this time, the wire supplied from the wire supply device formed on the outside of the torch body 100 passes through the first tip part 200 and the second tip part 300 and protrudes to the outside of the torch body 100, and the gas lens part ( 400), the protective gas may be injected from the inside of the torch body 100 to the outside.

The torch body 100 may include a gas nozzle, the gas nozzle being formed at one end of the torch body 100 to guide the protective gas, and the first tip 200 and the second tip 300 of the Shear can be protected.

That is, the torch body 100 may have a housing structure surrounding each component of the torch for welding to the welding base material.

1, the first tip portion 200 is formed inside the torch body 100, and discharges the first welding wire to the outside of the torch body 100 to generate an arc in the welding base material, The second tip part 300 is formed on the side of the first tip part 200 in the inside of the torch body 100, and discharges the second welding wire to the outside of the torch body 100 to generate an arc in the welding base material. there is.

Specifically, the first tip portion 200 is formed in the front of the welding proceeding direction, the second tip portion 300 is formed in the rear of the welding proceeding direction with a first interval on one side of the first tip portion 200, the wire supply By supplying wires to the first tip portion 200 and the second tip portion 300 , respectively, it is possible to discharge the first welding wire and the second welding wire to the front of the torch body 100 .

Although not shown, the first tip part 200 and the second tip part 300 may be inclined at a predetermined angle with respect to the vertical line of the welding base material.

As shown in FIG. 1 , the welding torch according to an embodiment of the present invention may further include a gas lens support part 500 .

The gas lens support part 500 may be formed so that the gas lens part 400 is fixed to the inside of the torch body 100 at the upper and lower positions of the gas lens part 400 .

Specifically, the gas lens support part 500 may be formed to protrude inward from the inside of the torch body 100 , and the gas lens support part 500 is formed in a ring shape and inserted into the inside of the torch body 100 , or can be joined.

The gas lens unit 400 is inserted into the torch body 100 in which the upper first gas lens support part is formed, and the gas lens part 400 is installed in the torch body 100 by installing the lower second gas lens support part. can be fixed In addition, the gas lens part 400 can be fixed through the gas lens support part 500 in various other ways, and the gas lens part inside the torch body 100 in addition to the gas lens support part 500 by bonding, sealing, etc. (400) can be fixed.

2 is a perspective view showing the gas lens unit 400 according to an embodiment of the present invention, FIG. 3 is a cross-sectional view showing the gas lens unit 400 of FIG. 2 , and FIG. 4 is the gas lens unit 400 of FIG. 2 . ) is a bottom view showing

The gas lens unit 400 may be formed in a cylindrical shape so that at least a portion thereof is inserted into the torch body 100 .

As shown in FIG. 2, the gas lens unit 400 is spaced apart from the central axis by a predetermined distance in both directions so that the first tip part 200 and the second tip part 300 can be inserted thereinto. In this case, the through portion 410 may include a first through hole portion 411 to which the first tip portion 200 is fixed and a second through hole portion 412 to which the second tip portion 300 is fixed.

Since the first through-hole part 411 and the second through-hole part 412 are fixed to be spaced apart from each other by a predetermined distance, insulation between the first tip part 200 and the second tip part 300 may be maintained.

In the gas lens unit 400 , a protection gas flow path portion may be formed so as to spray the protection gas supplied from the external protection gas supply unit 600 toward the front (downward in FIG. 1 ) of the torch body 100 .

2 to 4 , the protective gas flow passage formed in the gas lens unit 400 according to an embodiment of the present invention includes a protective gas inlet 420 , a protective gas outlet 430 and a distribution passage. part 440 may be included.

The protective gas inlet 420 may be formed by being connected to one surface of the gas lens unit 400 through one hole so that the protective gas supplied from the outside flows into the gas lens unit 400 .

Specifically, the protective gas inlet 420 is formed on the side of the gas lens unit 400 , the protective gas supply unit 600 is connected to the outside of the gas lens unit 400 , and the gas lens unit 400 is inside the gas lens unit 400 . may be connected to at least a portion of the distribution passage 440 to be described later.

The distribution passage 440 may be formed so that the protective gas is distributed from one protective gas inlet 420 to a plurality of protective gas outlets 430 .

Specifically, the distribution flow path part 440 is formed as a donut-shaped flow path part to surround the first through-hole part 411 and the second through-hole part 412, and at least part of it communicates with the protective gas inlet part 420, The other portion is divided into a plurality of flow passages and is connected to the lower surface of the distribution passage portion 440 .

As shown in FIG. 2 , the protective gas inlet 420 may be formed at the same height as the distribution passage 440 , and, although not shown, may be formed at different heights to communicate with each other.

The protective gas outlet 430 may be formed by being connected to a plurality of holes on the lower surface of the gas lens unit 400 so that the protective gas is sprayed to the front of the torch body 100 . Specifically, the protective gas outlet 430 may be divided into a plurality of passages in the distribution passage 440 inside the gas lens unit 400 to communicate with a hole in the lower surface of the gas lens unit 400 .

The protective gas flow path part may be formed to surround the penetration part 410 around the penetration part 410 . That is, the first tip part 200 and the second tip part 300 are fixed to the protective gas outlet 430 so that the protective gas can be injected around the first tip part 200 and the second tip part 300 . It may be formed so as to surround the periphery of the through-portion 410 to be.

In addition, the protective gas outlet 430 may protect each tip coupled to the plurality of penetration parts 410 by spraying the protective gas between the plurality of penetration parts 410 .

Accordingly, the protective gas is injected into the front of the welding part of the welding torch through the gas lens unit 400 to increase the straightness of the gas injection. Accordingly, the occurrence of turbulence of the protective gas is small, the flow is stabilized, and the gas consumption can be reduced. there is.

In addition, when a protective gas is supplied from the diffuser formed on the conventional welding tip, thermal deformation may occur in the tip or the diffuser due to the welding heat, but the gas lens unit 400 is formed to fix the tip, and the gas lens unit 400 ) to prevent deformation of the diffuser by not forming a plurality of holes in the diffuser by supplying the protective gas.

5 is a perspective view showing a gas lens unit 400 according to another embodiment of the present invention.

As shown in FIG. 5 , the protective gas flow passage formed in the gas lens unit 400 according to another embodiment of the present invention includes a protective gas inlet 420 , a protective gas outlet 430 , and a distribution passage 440 . ) may be included.

Specifically, the protective gas inlet 420 is formed on the upper surface of the gas lens unit 400 , and is connected to the protective gas supply unit 600 outside the gas lens unit 400 , and the gas lens unit 400 is inside the gas lens unit 400 . It may be connected to at least a portion of the distribution passage 440 .

The protective gas outlet 430 and the distribution flow path 440 are the same as described above, and thus will be omitted.

6 is a perspective view showing a gas lens unit according to another embodiment of the present invention.

As shown in FIG. 6 , the gas lens unit 400 according to another embodiment of the present invention may include a diffusion passage unit 450 .

One side of the diffusion passage 450 is connected to the protective gas inlet 420 extending to the center of the gas lens unit 400 , and the other end is distributed into a plurality of passages so as to be radially connected to the distribution passage 440 . can be formed.

Specifically, the protective gas inlet 420 extends to the central portion of the gas lens unit 400, and from the center of the gas lens unit 400 to the distribution passage 440 is a diffusion path formed of a plurality of symmetrical flow passages. A portion 450 may be formed.

The protective gas introduced from the protective gas inlet 420 is equally distributed from the center through the diffusion passage 450 to both sides of the distribution passage 440, and the protective gas is applied at the same pressure at the protective gas outlet 430. can be sprayed.

7 is a view showing a welding torch according to another embodiment of the present invention.

7 , the gas lens unit 400 according to another embodiment of the present invention may include a stepped portion 460 .

The gas lens unit including the protective gas inlet 420 , the protective gas outlet 430 , and the distribution flow path 440 may be formed by coupling the first torch body and the second torch body to the front and rear sides. That is, the torch body 100 may be coupled to both sides of the gas lens unit.

Specifically, the gas lens unit may have a larger outer diameter of at least one section (A) in the longitudinal direction, so that the stepped portion 460 may be formed so that the torch body 100 can be inserted.

A stepped portion 460 is formed in the gas lens portion, and the torch body 100 is coupled to both sides of the stepped portion 460 so that at least one section (A) of the gas lens portion is formed on the outside of the torch body 100 . can be Thus, the gas lens unit may be connected to the external protective gas supply unit 600 from the side of at least one section (A) of the gas lens unit to which the outer surface is exposed to receive the protective gas and spray it to the front of the welding torch.

That is, by forming the stepped portion 460, it is easy to assemble the torch body 100, and the side of the gas lens part is exposed to the outside, so that it is easy to connect with the protective gas supply part 600, and it is sprayed to the front of the welding part of the welding torch. As a result, the straightness of the gas injection is increased, the occurrence of turbulence of the protective gas is less, the flow is stabilized, the gas consumption can be reduced, and the deformation of the diffuser can be prevented.

8 is a photograph comparing the gas flow of the welding torch to which the gas stove part is not applied and the welding torch to which the gas stove part of the present invention is applied.

As shown in Fig. 8 (a), the protective gas sprayed from the conventional welding torch in which the gas stove part is not formed has a wide diffusion range of the protective gas, and a vortex flow can be generated to make the arc unstable during welding. .

However, as shown in FIG. 8(b), the protective gas sprayed from the welding torch to which the gas stove according to an embodiment of the present invention is applied has a narrow diffusion range of the protective gas, and the vortex flow is much reduced, Since the injection is shown in a straight line, the arc can be made stable during welding.

9 is a graph showing the porosity of a welding part using a welding torch according to an embodiment of the present invention, and FIG. 10 is a graph showing the porosity of a welding part using a conventional welding torch.

Under the welding conditions using the conventional welding torch, the supply amount of the protective gas of the preceding welding torch and the following welding torch was 6 L/min, 8 L/min, and 10 L/min, respectively.

As shown in FIG. 9 , in the welding part welded in the conventional welding torch in which the gas stove part is not formed, the porosity when the protective gas supply amount of the preceding welding torch and the following welding torch is respectively supplied at 6 L/min + 6 L/min was 2.7%, and when supplied at 8 L/min + 8 L/min, the porosity was 1.09%, and when supplied at 10 L/min + 10 L/min, the porosity was 0.76%.

However, as shown in FIG. 10, the welding part welded in the welding torch to which the gas stove according to an embodiment of the present invention is applied has a porosity of 0.45% when the supply amount of the protective gas is supplied at 12L/min, 16 When supplied at L/min, the porosity was 0.41%, and when supplied at 10 L/min, the porosity was 0.43%.

As shown in the porosity of the weld welded using the conventional welding torch of FIGS. 9 and 10 and the welding torch to which the gas lens part of the present invention is applied, when the same flow rate is supplied, the defect rate of the conventional welding torch is the maximum Although it was shown to be 0.76% to 2.7%, the defect rate of the welding torch to which the gas lens unit of the present invention is applied is only 0.6%, which is a very good level.

In particular, in order to minimize the defect rate in the conventional welding torch, 0.76% is generated when the supply amount of the protective gas is controlled to 10 L/min + 10 L/min, but in the welding torch to which the gas lens unit of the present invention is applied, a total of 12 L/ Even if controlled by min, the flow rate can be reduced by about 40% compared to the conventional welding torch by 0.45%.

Accordingly, according to various embodiments of the present invention, the protective gas is injected to the front of the welding part of the welding torch through the gas lens unit 400 to increase the straightness of the gas injection. It is stabilized, gas consumption can be reduced, and a welding torch capable of preventing deformation of the diffuser can be implemented by supplying a protective gas through the gas lens unit 400 without forming a plurality of holes in the diffuser. Of course, the scope of the present invention is not limited by these effects.

Although the present invention has been described with reference to the embodiments shown in the drawings, which are merely exemplary, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

100: torch body
200: first tip portion
300: second tip portion
400: gas lens unit
410: penetrating part
411: first through-hole portion
412: second through-hole portion
420: protective gas inlet
430: protective gas outlet
440: distribution passage unit
450: diffusion passage unit
460: stepped portion
500: gas lens support
600: protective gas supply unit

Claims (8)

torch body;
a first tip formed in the torch body and discharging a first welding wire to the outside of the torch body to generate an arc in the welding base material;
a second tip portion formed on the side of the first tip portion in the inside of the torch body, and discharging a second welding wire to the outside of the torch body to generate an arc in the welding base material; and
At least a portion is formed in a cylindrical shape inside the torch body, a penetration portion is formed so that the first tip portion and the second tip portion are penetrated and fixed, and a protective gas supplied from an external protective gas supply unit is applied to the front of the torch body. a gas lens unit in which a protective gas flow path unit is formed to be injected into
including,
The protective gas flow path part,
a protective gas inlet part connected to one surface of the gas lens part through a single hole so that the protective gas is introduced;
a protective gas outlet formed by being connected to the other surface of the gas lens part through a plurality of holes so that the protective gas is sprayed; and
a distribution flow path formed to distribute the protective gas from one of the protective gas inlets to a plurality of the protective gas outlets;
including,
The protective gas inlet,
A welding torch formed on a side surface of the gas lens unit and connected to the protective gas supply unit outside the gas lens unit and connected to at least a portion of the distribution passage unit inside the gas lens unit. delete delete delete The method of claim 1,
a diffusion passage portion having one side connected to the protective gas inlet extending to the center of the gas lens portion, and the other side being distributed into a plurality of passages and formed to be radially connected to the distribution passage portion;
Further comprising, a welding torch. The method of claim 1,
The penetrating part,
a first through-hole portion to which the first tip portion is fixed; and
a second through-hole portion to which the second tip portion is fixed;
including,
The protective gas flow passage portion is formed around the through portion to surround the through portion, the welding torch. The method of claim 1,
a gas lens support part protruding from the upper and lower positions of the gas lens part to the inside of the torch body to fix the gas lens part;
Further comprising, a welding torch. The method of claim 1,
The gas lens unit,
At least one section of the outer diameter in the longitudinal direction is formed to be larger, the step portion is formed so that the torch body is inserted;
including,
The at least one section of the gas lens part is formed on the outside of the torch body, welding torch.

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