KR101825939B1 - Metal pipe connection and connection method with different materials - Google Patents

Abstract

The present invention relates to a connection device and a connection method for different kinds of metal pipes, which can increase a welding area and improve tightness by expanding an insertion end when welding pipes with materials different from each other, in particular, a copper pipe and an aluminum pipe in an alloy form through melting by using electricity. More specifically, the present invention relates to the device for connecting the copper pipe and the aluminum pipe through melting and welding in an electric conduction mode, comprising: an expanding fixture which is separated from a copper pipe during melting and welding of the aluminum pipe and the copper pipe; a first and a second clamp which fix the aluminum pipe and the copper pipe; a conduction unit which supplies electric current to the aluminum pipe and the copper pipe; and a discharge unit which operates to separate the expanding fixture. Therefore, the connection device and the connection method can improve bonding force by expanding a diameter of the insertion end when welding a welding unit through a molten alloy by melting a portion of the welding unit in an electric conduction mode which connects different poles to the copper pipe and the aluminum pipe.

Description

Technical Field [0001] The present invention relates to a metal pipe connection method,

More particularly, the present invention relates to an apparatus and method for connecting different types of metal pipes, and more particularly, to an apparatus and a method for connecting different types of pipes by using a semi-automatic method, And an air conditioner, a heterogeneous metal pipe connecting device applicable to household appliances, and a connecting method.

Generally, a product such as a refrigerator and an air conditioner is equipped with a cooling device for performing a cooling function inside. In such a cooling device, a capillary tube called a capillary through which refrigerant flows from a condenser to an evaporator is communicated, A suction pipe through which the refrigerant circulating in the evaporator flows into the compressor is provided, and the refrigerant discharged from the compressor is supplied to the evaporator through the condenser after passing through the condenser.

In addition, when the refrigerant discharged from the compressor is introduced into the evaporator in a state of high temperature and high pressure, the cooling apparatus has a problem that the cooling efficiency of the evaporator is extremely lowered due to the high temperature refrigerant. Therefore, And the refrigerant flowing through the capillary tube is heat-exchanged by the suction tube so that the temperature of the refrigerant is lowered to some extent and flows to the evaporator, thereby increasing the cooling efficiency .

Therefore, in the related art, a capillary tube made of a copper material is welded and fixed to a suction tube made of a copper material so as to perform heat exchange. However, recently, when piping is made of copper (Cu) The cost of manufacturing the refrigerator and the air conditioner is increased because of the high cost and fluctuation of the material cost and the difficulty in procuring the supply and demand. Efforts have been made to manufacture a suction pipe using aluminum (Al).

However, when the suction tube is made of aluminum material and the capillary tube is made of copper material, they are dissimilar metals, which causes shrinkage of the adhesive portion.

Therefore, conventionally, a method of covering the outside of the suction tube with a shrink tube, that is, covering the inside of the suction tube, placing the capillary tube thereon, and coating the suction tube and the capillary tube together using the shrink tube Respectively.

In recent years, in addition to the melting point difference of 400 ° C between the copper pipe and the aluminum pipe, direct chemical bonding between the metal atoms of the two materials is difficult to obtain because the oxide layer is present on the inner surface of the aluminum pipe, It will not form a eutectic structure.

This eutectic structure means a low melting point alloy formed under high pressure and composed of a copper-aluminum metal compound and aluminum. Currently, there are eutectic structures in every weld line of weld joints of the plug-in copper-aluminum pipe.

In some of the external inventions employing the high-frequency heating welding method of the plug-in copper-aluminum here, the thickness of the copper-aluminum eutectic structure at the welding point is within 10 탆 and the weld line may be allowed to consist of a copper-aluminum eutectic structure. In practice, however, it has been demonstrated that the destruction of the welded joints of copper-aluminum pipes is easy to use due to the copper-aluminum eutectic structure and its low peel strength.

Various welding methods currently known for the welding of copper-aluminum thin wall pipes can not completely prevent the copper-aluminum eutectic structure from being formed in the weld line, and therefore the chemical bonding of the weld structure can not be obtained. Although the energy storage welding and friction welding of butt joints can reduce the amount of covalent structure by reducing the end force prior to welding finishing, the construction of the joints is that the method requires welding of a copper-aluminum thick wall pipe with a wall thickness of 1.25 mm or more Of the total. Thus, the method can not be used for welding of copper-aluminum thin wall pipes in connection with the present invention. The welding method of the plug-in copper-aluminum pipe joint is suitable for the welding of copper-aluminum thin wall pipe, but if high frequency welding or braze welding is adopted, copper-aluminum chemical bond can not be obtained and the pore, It is very difficult to produce in large quantities due to some adverse factors such as eutectic structure and potential corrosion risk.

All these technical deficiencies limit the use of aluminum pipes in the refrigeration industry.

In order to solve this problem, one copper pipe and one aluminum pipe are respectively selected, one end of the copper pipe is processed by noising, a metal rod is preliminarily fixed inside the nozing end of the copper pipe welding part, The copper pipe is placed in the moving electrode group and the copper pipe is fixed in the high pressure cylinder while the aluminum pipe is placed in the fixed electrode group and the aluminum pipe is fixed with the high pressure cylinder The felder is made of a material having a higher heat resistance and a lower thermal conductivity than aluminum and the inner pore shape of the felder corresponds to the outer shape of the aluminum pipe, Ensure that the ends of the pipe are aligned with the edges of the felt , The cylinder pushes the moving electrode group having the copper pipe toward the aluminum pipe and at the same time connects the moving electrode group and the circuit of the fixed electrode group to the power source and the copper pipe is continuously moved into the aluminum pipe under the action of the cylinder, During the movement, the temperature of the copper-aluminum welding can be controlled by controlling the interval of 1 ~ 2mm according to the pressure and the welding current of the one time variable. It is possible to control the temperature of copper-aluminum welding, remove the metal rod from the copper pipe A non-eutectic welded joint manufacturing method is provided.

However, in the conventional method of manufacturing a weld joint of a non-eutectic structure, there is an inconvenient problem that the diameter of the pipe must be increased by inserting the cylinder into the inside of the pipe, and then removed through the inside of the pipe.

As a result, there is a desperate need for an improved technique for quick removal time and simplification of the operation, in which the dissimilar pipes are melt-bonded and the expansion port is withdrawn and removed.

Registration No. 10-1218072 (Corrosion-proof structure of suction tube having inter-metallic interposer in cooling device) Registration No. 10-1388191 (pipe connection method) Open No. 1997-0005490 (Method of joining copper tube and aluminum tube) Registration No. 10-1057068 (Welding Joint of Non-Eutectic Structure of Copper-Aluminum Thin Wall Pipes and Manufacturing Method Thereof)

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems described above, and it is an object of the present invention to provide a method of melting a part of a joint by using an electric current conduction method in which a copper pipe and an aluminum pipe are connected with different poles, And to provide a connection device and a connection method that can increase the bonding force by expanding the diameter of the insertion end at the time of insertion.

The present invention is intended to quickly and precisely separate the expansion port in accordance with the moment of joining by performing a connection operation after previously installing an expansion port in one pipe of the different pipes.

Disclosure of Invention Technical Problem [10] The present invention provides a semiautomatic removal of a detachment operation using a connecting device, thereby shortening a working time.

In the present invention, the expanding ball can separate the expanding ball and the separating end so that they can be easily and individually replaced when wear or deformation occurs.

The present invention provides an eccentric shape of an expanding sphere so that even when the cutting portion of the pipe is not concentric, eccentricity can be dispersed evenly.

The present invention relates to an apparatus for melting and joining a copper tube and an aluminum tube of different materials according to an embodiment of the present invention in an electrically energized manner and is inserted through an insertion end of a copper tube connected to an aluminum tube, A main body to which the first and second clamps for fixing the aluminum tube and the copper tube are installed in a straight line, and a main body And a discharging portion formed at one side of the main body so as to pressurize and expand the inner surface of the inserting end when the inserting end and the aluminum pipe are connected by fusion to the aluminum pipe and the copper pipe and to discharge the expanding port to the outside of the copper pipe. Thereby providing a connection device.

The expanding ball may include an expanding ball having a spherical shape larger than the inner diameter of the insertion end of the copper tube and a distal end connected to one side of the expansion ball and inserted through the insertion end to expose to the end of the copper pipe Thereby providing a heterogeneous metal pipe connection device.

The extension ball is formed in a shape of an elliptical shape formed of a material harder than a copper tube, and the diameter of the expansion ball is formed to be 0.5 to 1 mm larger than the inner diameter of the insertion end of the copper tube, And a ring is formed at the end of the connecting end to be connected, or a hooking end is formed.

In addition, the connecting end of the releasing end is configured to be disassembled and assembled into the extended ball in an integrated manner or a spiral manner.

The first and second clamps may include first and second fixed ends in the form of semicircular rings fixed to the main body, first and second fixed ends disposed on the first and second fixed ends, And the first and second movable ends of the ring shape are constituted.

The discharge portion may include a latching portion connected to a third actuator formed on a side surface of a body of the copper tube and hooked to a releasing end of the expanding port and moving back and forth, a latching portion formed to be rotated by the third cylinder rod of the third actuator, The present invention provides a dissimilar metal pipe connecting apparatus.

The present invention also provides a method of connecting a dissimilar metal pipe using an apparatus for melting and joining copper (copper) pipes of different materials and an aluminum pipe in an electrically energized manner, the method comprising the steps of: And the extension bulb is exposed on the front surface of the insertion end, an aluminum tube installation step of fixing the aluminum tube by using the first clamp after the extension hole installation step, A step of installing a copper tube in which the insertion end of the copper pipe is inserted into the one end of the aluminum pipe and fixing the same using the second clamp after the step of passing through the copper pipe, A connecting step of connecting the conductive parts to the aluminum pipe and the copper pipe after the mounting step, After passing through the connection part of the conduit, the aluminum pipe which is in contact with the outer surface of the insertion end of the copper pipe is melted to form a molten alloy while applying electric current to the aluminum pipe and the copper pipe. A step of disengaging the clamping force of the first and second clamps by releasing the clamping force of the expanding ball after the expanding and releasing step; And a disassembling step of disassembling the dissimilar metal pipe connecting device.

In addition, in the expanding and separating step, the inner surface of the insertion end of the extension ball is pressed, and the outer surface of the insertion end and the inner surface of the aluminum tube are in contact with each other at the time of separation, Thereby providing a connection method using a dissimilar metal pipe connection device.

According to an embodiment of the present invention, a part of a joint is melted by using an electric conduction method in which a copper (copper) pipe and an aluminum pipe are connected with different poles, and the diameter of the insert is increased So that the bonding force can be increased.

In addition, the present invention has the effect of quickly and accurately separating the expanding port in accordance with the moment of bonding by performing the connecting operation after previously installing the expanding port in one pipe of the different pipes.

In addition, according to the present invention, it is possible to remove the disengagement operation using the connecting device in a semiautomatic manner, thereby shortening the operation time.

In addition, according to the present invention, the expanding ball can separate the expanding ball and the releasing end so that they can be easily and individually replaced when wear or deformation occurs.

In addition, the present invention has an effect of making the expanding sphere be in the form of an elliptical shape so that even when the cutting portion of the pipe does not form a concentric circle but is eccentric, the force can be evenly dispersed.

1 is an exploded perspective view of an aluminum pipe, a copper pipe, and an expanding mouth according to the present invention,
FIG. 2 is an exploded perspective view of an aluminum pipe and a copper pipe according to the present invention,
FIG. 3 is a perspective view showing a copper pipe inserted into an aluminum pipe according to the present invention,
Fig. 4 is a sectional view of Fig. 3,
Fig. 5 is a perspective view of an extension sphere according to another embodiment,
FIG. 6 is an exploded perspective view of an enlarged sphere according to a form in which an extension sphere and a latching end are separated,
7 is a schematic side view of a dissimilar metal pipe connecting apparatus according to the present invention,
FIG. 8 is an operation diagram of the first and second clamps in the dissimilar metal pipe connecting apparatus according to the present invention,
FIG. 9 is a side view showing a discharging portion in the dissimilar metal pipe connecting apparatus according to the present invention. FIG.
10 is a side view showing an aluminum pipe and a copper pipe installed in the dissimilar metal pipe connecting apparatus according to the present invention,
11 is a sectional view of an aluminum pipe and a copper pipe connected to the dissimilar metal pipe connecting apparatus according to the present invention,
FIG. 12 is a side view of a drawer of a dissimilar metal pipe connecting apparatus according to the present invention,
FIG. 13 shows the conceptual change of the melting point and the diameter of the insertion end of the copper pipe when the expansion port is pulled out using the discharge portion,
FIG. 14 is a cross-sectional view showing a welding spot welded to an aluminum pipe and a copper pipe by a melting action,
15 is a flowchart of a connection method using a dissimilar metal pipe connecting apparatus according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Like parts are designated with like reference numerals throughout the specification.

As shown in FIGS. 1 to 10, the configuration of a dissimilar metal pipe connecting apparatus of the present invention will be described below with reference to the accompanying drawings. In the following, an apparatus for connecting a copper (copper) pipe and an aluminum pipe by electric welding An expansion port 10 in which the aluminum pipe 1 and the copper pipe 2 are detached from the copper pipe 2 at the time of the melting and bonding and a first and second clamps 10 and 10 for fixing the aluminum pipe 1 and the copper pipe 2, A connection part 30 for supplying an electric current to the aluminum pipe 1 and the copper pipe 2 and a discharge part 40 for operating to release the expansion hole 10, Thereby constituting the apparatus 100.

The connection pipe 100 connects the aluminum pipe 1 with the insertion end 3 of the copper pipe 2 and forms an opening 10 for exposing the front end of the insertion end 3.

The expansion hole 10 forms an enlarged ball 11 having a spherical shape larger than the inner diameter of the insertion end 3 of the copper tube 2.

It is preferable that the extension ball 11 is formed in the shape of an ellipse formed of a material harder than the copper tube 2 and that the outer surface accuracy of the extension ball 11 is such that friction with the insertion end 3 does not occur.

The diameter of the expansion ball 11 is larger than the inner diameter of the insertion end 3 of the copper tube 2. The diameter of the expansion ball 11 is larger than the diameter of the aluminum tube 1 and the copper tube 2 And the thickness of the aluminum tube 1 and the copper tube 2, respectively.

The detachment end 12 is connected to one side of the expansion ball 11 and inserted through the insertion end 3 to expose the end of the copper tube 2. The detachment end 12 is made of a metal material And may be made of a synthetic resin material having excellent rigidity.

The releasing end 12 forms a ring 14 or an engaging end 15 at the end of a connecting end 13 connected to the extending ball 11. [

The connecting end 13 of the releasing end 12 can be configured to be disassembled and assembled into the expanding ball 11 in an integrated manner or in a spiral manner. The expanding opening 10 can be repeatedly used, The expansion ball 11 or the separation end 12 can be individually replaced when the abrasion of the separation plate 11 or the breakage of the separation plate 12 occurs.

The main body 20 is provided with the first and second clamps 21 and 22 for fixing the aluminum tube 1 and the copper tube 2 in a straight line.

The first and second clamps 21 and 22 include first and second fixed ends 21a and 22a in the form of a semicircular ring fixed to the main body 20, 21c (22c).

The first and second movable ends 21b, which are disposed on the first and second fixed ends 21a and 22a and are lifted up and down by the first and second actuators 23 and 24, And the first and second cylinder rods 23b and 24b that draw and insert the first cylinder rod 22b from the first and second cylinders 23a and 24a are separated from the first and second fixed ends 21a and 22a So as to move upward.

When the aluminum pipe 1 and the copper pipe 2 are installed on the first and second fixed ends 21a and 22a respectively and the first and second actuators 23 and 24 are operated, 21b 22b clamp the aluminum tube 1 and the copper tube 2 between the first and second fixed ends 21a, 22a.

A conductive part 30 is formed on one side of the main body 20 so as to electrically conduct different polarities to the aluminum tube 1 and the copper tube 2. The conductive part 30 includes an aluminum tube 1, And the current is supplied to the copper tube 2 at different polarities.

When the insertion end 3 and the aluminum pipe 1 are fused and joined to the aluminum pipe 1 and the copper pipe 2 by electric current, the inner surface of the insertion end 3 is expanded and the expansion port 10 The discharge unit 40 is formed on one side of the main body 20 so as to discharge the discharge gas.

The discharge unit 40 is connected to the third actuator 41 formed on the side of the main body 20 provided with the copper pipe 2 and is engaged with the releasing end 12 of the expanding opening 10, And constitutes a sphere 42.

It is preferable that the stopper 42 is formed in a shape of a hook or a hook so as to be engaged with a stop 15 formed at the end 12 of the expanding mouth 10,

And the third cylinder 41b constitutes a stopper 42 for fixing the third cylinder 41a to the third cylinder 41b of the third actuator 41. The third cylinder 41b is connected to the main body 20 And fixed to the cylinder fixing body 43 formed on the cylinder fixing member 43.

The main body 20 is provided with a clamp switch for operating the first and second clamps 21 and 22 and a switch for actuating the first, second and third actuators 23, 24 and 41, (Button) for controlling power supply, and a power switch (button) for controlling the power supply.

The use state of the repairing method using the repair device of the unconfirmed settlement structure having the above structure will be described as follows.

1 to 15, the present invention relates to a method of connecting a dissimilar metal pipe using an apparatus for melting and joining copper (copper) pipes of different materials and aluminum pipes in an electrically energized manner.

The distal end 12 of the expanding port 10 is inserted from the insertion end 3 side of the copper tube 2 and exposed to the opposite end of the copper tube 2. The extension ball 11 is inserted into the insertion end 3 (S1) is carried out.

At this time, since the extension hole 10 is installed so as not to be detached from the copper tube 2, the connection operation between the aluminum tube 1 and the copper tube 2 is simplified by preliminarily performing the pre- Can be saved.

Thereafter, the aluminum tube installation step S2 is performed in which the aluminum tube 1 is fixed by using the first clamp 21 after the expansion hole setting step S1.

A copper tube mounting step S3 for fixing the insertion end 3 of the copper tube 2 by inserting the aluminum tube 1 into one end of the aluminum tube 1 using the second clamp 22 after the step of installing the aluminum tube 2, ).

The first and second clamps 21 and 22 increase or decrease the number of the first and second clamps 21 and 22 according to the length of the aluminum tube 1 and the copper tube 2,

The aluminum tube 1 and the copper tube 2 are pressed in such a manner that the extension ball 11 and the insertion end 3 are completely inserted into the aluminum tube 1 while being positioned on a straight line.

Next, after the copper pipe installation step S3 is performed, the retaining end 15 formed on the end 12 of the expansion port 10 is engaged with the retaining hole 42 of the ejection part 40 Step S4 is executed.

At this time, the latching end (15) is stably held in the latching hole (42) so as not to be separated.

Next, a connection step S5 of connecting the conductive parts 30 to the aluminum pipe 1 and the copper pipe 2 is carried out after the above-mentioned latching operation setting step S4.

Here, in the present invention, the positive electrode of the conductive unit 30 is connected to the aluminum pipe 1, and the negative electrode is connected to the negative electrode of the copper pipe 2 to control the application of current by the operation of the control unit 25, do.

The inner surface of the aluminum pipe 1 which contacts the outer surface of the insertion end 3 of the copper pipe 2 while applying current to the aluminum pipe 1 and the copper pipe 2 after passing through the conductive part connection step S5 When the molten alloy is formed, the releasing end 12 engaged with the engaging member 42 is pulled by the operation of inserting the third actuator 41 of the discharging portion 40 so that the extending ball 11 is inserted into the inserting end 3, (S6) for releasing the inner surface of the base plate (10) by press contact.

The outer surface of the insertion end 3 and the inner surface of the aluminum pipe 1 are brought into contact with each other while the inner side of the insertion end 3 of the expansion ball 11 is pressed in the expanding and separating step S6, Part is welded.

That is, in the present invention, a method of connecting the aluminum tube 1 and the copper tube 2 adopts a high-frequency heating welding method of the plug-in copper-aluminum. And the inner surface of the aluminum pipe 1 are referred to as the welding point 4, the thickness at which the copper-aluminum melts at the welding point is about 10 占 퐉 and the welding point is the melting alloy made of copper- (Welded).

However, when the aluminum pipe 1 is connected to the copper pipe 2 by welding, the breakage of the welding point 4 is weakened by the peeling strength. Therefore, when the welding action is generated, 4) and increasing the welding area by increasing the welding area.

Next, the clamping force of the first and second clamps 21 and 22 is released after the extension shedding step S6, and the disassembling step of disassembling the aluminum tube 1 and the copper tube 2 integrally connected S7) to complete the product.

In the present invention, the connecting part 100 is formed by melting a part of a joint part using an electric current conduction method in which a copper pipe 2 and an aluminum pipe 1 are connected with different current poles, 3) can be enlarged to increase the bonding force.

The connecting device 100 of the present invention is characterized in that it is possible to quickly and accurately separate the expanding port in accordance with the moment of connection by performing the connecting operation after previously installing the expanding port on one of the pipes of different kinds have.

In addition, since the disconnecting operation of the expanding mouth 10 can be removed using the semi-automatic mode, the connecting apparatus 100 of the present invention can shorten the working time and increase the production amount.

In addition, the connecting device 100 of the present invention is capable of separating the extension ball 11 and the separation end 12 of the expansion port 10 so that they can be easily and individually replaced when wear or deformation occurs .

The connecting pipe 100 of the present invention can form the elliptical shape of the expansion ball 11 of the expansion hole 10 so that even if the cut portion of the insertion end 3 is eccentric and eccentric, So that the welding bonding force is uniform.

While the present invention has been described with reference to the accompanying drawings, it is to be understood that the present invention is not limited to the specific forms and orientations, and various modifications and changes may be made by those skilled in the art. Should be construed as being included in the scope of the present invention.

1: aluminum tube 2: copper tube
3: Insertion end 10: Extension hole
11: Expansion ball 12: Disengagement stage
13: Linking stage 14: Link
15: latching end 20:
21: first clamp 21a: first fixed end
21b: first movable end 22: second clamp
22a: second fixed end 22b: second movable end
23: first actuator 23a: first cylinder
23b: first cylinder rod 24: second actuator
24a: second cylinder 24b: second cylinder rod
30:
40: discharging part 41: third actuator
41a: third cylinder rod 41b: third cylinder
42: latching member 43: cylinder fixing body
100: connecting pipe
S1: Expansion hole installation step S2: Aluminum pipe installation step
S3: Copper tube installation step S4: Jamming installation step
S5: Connection part of connection step S6: Extension port departure step
S7: Disassembly phase

Claims (8)

1. An apparatus for melting and joining copper (copper) pipes and aluminum pipes of different materials by electric conduction,
An expansion port 10 inserted through the insertion end 3 of the copper tube 2 connected to the aluminum tube 1 and exposed forward of the insertion end 3,
A main body 20 having first and second clamps 21 and 22 for fixing the aluminum tube 1 and the copper tube 2 in a straight line,
(30) formed on one side of the main body (20) so as to energize different poles respectively in the aluminum pipe (1) and the copper pipe (2)
When the insertion end 3 and the aluminum pipe 1 are fused and joined to the aluminum pipe 1 and the copper pipe 2 by electric current, the inner surface of the insertion end 3 is expanded and the expansion port 10 (40) formed at one side of the main body (20) so as to discharge the main body (20)
The first and second clamps 21 and 22 include first and second fixed ends 21a and 22a having a semicircular ring shape fixed to the main body 20 and first and second fixed ends 21a and 22a, And the first and second actuators 23 and 24 constitute first and second movable ends 21b and 22b in the form of semicircular rings which are lifted and lowered by the lifting operation of the first and second actuators 23 and 24. [ Device.
[2] The apparatus according to claim 1, wherein the expansion hole (10) comprises an enlarged ball (11) having a spherical shape larger than an inner diameter of the insertion end (3) of the copper tube (2)
Is connected to one side of the expansion ball (11) and inserted through the insertion end (3) to form a separation end (12) exposed to the end of the copper pipe (2).
[3] The apparatus of claim 2, wherein the extension ball (11) is formed in an elliptical shape formed of a harder material than the copper tube (2)
The diameter of the enlarged ball 11 is formed to be 0.5 to 1 mm larger than the inner diameter of the insertion end 3 of the copper tube 2,
Wherein the releasing end (12) forms a ring (14) or an engaging end (15) at an end of a connecting end (13) connected to the expansion ball (11).
The apparatus of claim 3, wherein the connection end (13) of the detachable end (12) is disassembled and assembled into the expansion ball (11) in an integral or spiral manner.
delete The exhaust apparatus according to claim 1, wherein the discharge port (40) is connected to a third cylinder rod (41a) of a third actuator (41) formed on a side surface of a main body (20) , And is configured to engage with the releasing end (12) of the engaging portion (42) to move back and forth.
A method of connecting a dissimilar metal pipe using an apparatus for melting and joining copper (copper) pipes made of different materials and an aluminum pipe by electric conduction,
The distal end 12 of the expanding port 10 is inserted from the insertion end 3 side of the copper tube 2 and exposed to the opposite end of the copper tube 2, (S1), (S2),
An aluminum tube installation step S2 for fixing the aluminum tube 1 using the first clamp 21 after the expansion hole installation step S1,
A copper tube mounting step S3 for fixing the insertion end 3 of the copper tube 2 by inserting the aluminum tube 1 into one end of the aluminum tube 1 using the second clamp 22 after the step of installing the aluminum tube 2, ),
(S4) for engaging the releasing end (12) of the expanding port (10) with the retaining opening (42) of the discharge port (40) after the copper pipe installation step (S3)
A conductive connection step S5 for connecting the conductive part 30 to the aluminum pipe 1 and the copper pipe 2 after the engagement operation step S4,
The inner surface of the aluminum pipe 1 which is in contact with the outer surface of the insertion end 3 of the copper pipe 2 is melted while applying current to the aluminum pipe 1 and the copper pipe 2 after passing through the conductive part connection step S5 When the molten alloy is formed, the releasing end 12 engaged with the engaging hole 42 is pulled by the third actuator 41 of the discharging portion 40 so that the enlarged ball 11 is pressed against the inner surface of the inserting end 3 An extension shedding step (S6) for releasing the squeezing contact while being in pressure contact,
A disassembling step S7 in which the clamping force of the first and second clamps 21 and 22 is released after the expanding and releasing step S6 to disassemble the aluminum tube 1 and the copper tube 2 integrally connected thereto And connecting the different metal pipe connection apparatuses. The method according to claim 7, wherein in the expanding and separating step (S6), the inner side of the insertion end (3) of the extension ball (11) is pressed and the outer surface of the insertion end (3) Wherein a portion to be melted and alloyed by energization is joined by a welding method.

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