KR101589482B1 - Welding equipment using a purge cap - Google Patents

Abstract

The present invention relates to a welding machine comprising: a first pipe which has a primary welding joint primarily welded to one end of a pipe, and a secondary welding joint secondarily welded to an other end of the pipe; a second pipe which has a welding part welded to the primary welding joint of the first pipe; and a third pipe which has a welding part welded to the secondary welding joint of the first pipe. As such, the present invention easily sends nitrogen into the pipe, discharges oxygen from the inside to an opposite side, and prevents oxygen from flowing inside through a welded part.

Description

[0001] Welding equipment using a purge cap [0002]

The present invention relates to a welding apparatus using a purge cap, and more particularly, to a welding apparatus using a purge cap, which is capable of easily introducing nitrogen into a pipe during welding of a pipe, discharging oxygen from the pipe to the opposite side, It prevents the leakage of internal nitrogen and prevents the oxidation of the welded part after welding the pipe. There is no impurities in the welded part and the cleanliness can be maintained, the sealing work of the pipe is made simple, and the strength of the welded part is maintained, The durability of the welded part is improved and the pipe welding of the straight pipe and the straight pipe can be easily done, as well as the pipe welding of the straight pipe and the bending pipe can be easily performed, and the external loss of nitrogen introduced into the pipe can be minimized, To reduce the cost of piping welding One will.

In general, welding is a process of joining metallic base materials by applying heat, pressure or heat and pressure at the same time, and arc welding, gas welding, resistance welding and special welding are among these. Among them, arc welding and gas welding are most widely used.

Double piping welding is required to ensure clean and smooth welding when oxygen is blocked from accessing the area to be welded. That is, as the concentration of oxygen in the welded region increases, soot generated by oxidation of oxygen is formed on the welded portion, and irregular patterns and smooth surface are generated, so that it is not easy to maintain the strength of the pipe. And the durability and quality of the piping are largely deteriorated. In order to prevent such poor quality welding, argon or nitrogen gas is injected into the welded region to cut off the access of oxygen, and then welding is performed.

On the other hand, if there is unburned gas, in the wind, or in other places, ventilation is called purging to discharge it out of the furnace before ignition because it may explode when ignited. Pre-purge is done before ignition, and post-purge is called after stop combustion. This purge operation prevents explosion.

When piping is welded, a shielding film such as a sponge or a styrofoam, for example, a purge jig, is installed in each pipe to be welded in order to prevent oxidation of the bead and ensure welding quality. Insert a purge jig into the pipe to be welded and inject gas such as argon (Ar) or nitrogen (N) to prevent oxidation of the weld bead. This operation is called purge operation, and the purge operation is an important task to prevent oxidation of the internal welded portion of the pipe. After the purge operation as described above, the two pipes are welded, and when the welding operation is completed, the purge jig is removed.

In the conventional jig, a sponge and a water-soluble paper have been used. However, since it is becoming increasingly difficult to apply the jig as the number of the tubular pipes increases, the jig for spreading the pipe with the sponge is required to have a sponge always connected to the pipe There is a problem in that it is difficult to pass through the curved tube because it is moved by contact, and it is almost impossible to block oxygen when the tube must pass through more than one curved tube. The sponge used as such a purge jig is not rigid and resilient enough to pass through more than one bend, and is passed through more than one bend, although the pores are formed such that air can pass therethrough, There is a problem that it is almost incapable of being discharged from the piping after the welding is completed, which is inconvenient to use.

4, a first sealing part 210 inserted into the first tube 211, a first connecting part 220 passing through the first sealing part 210, A second seal 310 inserted into a second tube 311 welded and joined to the first tube 211 and a second seal 310 inserted through the second seal 310, And a gas injection unit for injecting argon gas into the space between the first sealing part 210 and the second sealing part 310 through the second sealing part 310, A connection unit 400 connecting the first connection unit 220 and the second connection unit 320 and a connection unit 400 connecting the second connection unit 320 to the second connection unit 320, And a rope 500 exposed to the outside.

5, the inside purge jig 100 is composed of a rectangular first body 10 and a second body 20 made of a metal, and the first body 10 and the second body 20 are made of metal. A gas inlet 11 and a gas outlet 12 are fixedly attached to one side of the first body 10 and a plurality of And a plurality of screw holes 15 are formed on the outer circumferential surface of the silicone packing 13 so that bolts 18 are inserted into a plurality of screw holes 17 of the coupling member 16, And the bolts 18 penetrating the first body 10 are passed through the respective screw holes 15 'and 17' of the silicone packing 13 'and the engaging member 16' And the second body 20 is made of metal and has a plurality of screw holes 22 formed at equal intervals so as to be able to engage with the silicone packing 21, A plurality of screw holes 22 are formed on the outer circumferential surface of the silicone packing 21 so that the bolts 26 pass through a plurality of screw holes 25 of the engaging member 24, The bolts 25 penetrating through the respective screw holes 20 penetrate through the respective screw holes 23 'and 25' of the silicone packing 21 'and the engaging member 24' to be fixed by the nuts 27, And the main body 10 and the second main body 20 are connected by the connecting member 30.

The above-described conventional techniques of Patent Documents 1 and 2 have an effect of preventing the inside of the pipe from being oxidized by injecting gas into the inside of the pipe. However, since the gas must be continuously injected according to the welding time, There is a problem in that it is increased.

In addition, since the jigs are positioned on the two pipes for welding, and the respective jigs are connected by the connecting member, when the purge jig after welding is disconnected from the pipe, the connecting member for connecting the jig is separated There is a problem that the jig of the pipe is left inside the pipe and the connection member is connected again.

In order to solve these conventional problems, Patent Document 3 discloses, as shown in Fig. 6, "a pipe which is located inside a joint portion where a first pipe and a second pipe are connected, A plate that is cut at a position corresponding to a cut side of the body and is coupled to both ends of the body, a fastening member for fastening the body and a cut portion of the plate, A gas inlet for injecting a gas between the first pipe and the second pipe and the outside of the body to remove oxygen in the first pipe and the second pipe; And a packing member coupled to an outer side of the plate to closely contact the inner circumferential surface of the first pipe and the second pipe, Jigs for welding fuzzy. " Has been proposed in order to reduce the injection amount of inert gas such as argon, nitrogen, or a mixed gas of argon and nitrogen, which is injected into the pipe to remove oxygen existing in the pipe to prevent oxidation inside the pipe during welding.

The conventional welding purging jig is capable of removing the welding purging jig from the pipe by connecting the rope to the ring formed on the body and the plate after the completion of the welding. The pipe can be welded by straight pipe and straight pipe, However, there is a structural problem in that it is difficult to insert and remove the jigs for welding purging in the piping welding of the bending pipe and the bending pipe.

(1) Korean Utility Model Publication No. 20-2012-0004547 (2) Korean Patent Registration Publication No. 10-1266322 (3) Korea Patent Registration Publication No. 10-1523063

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to facilitate introduction of nitrogen into a pipe during welding of a curved pipe, to discharge oxygen therein to the opposite side, It prevents the leakage of internal nitrogen and prevents the oxidation of weld zone after welding. It is possible to maintain cleanliness because there is no impurities in weld zone and it is easy to seal the pipe, and the strength of weld zone is maintained, It is possible to easily weld piping of straight pipe and straight pipe as well as pipe welding of straight pipe and bend pipe as well as to pipe pipe of curved pipe and bend pipe and minimize external loss of nitrogen introduced into the pipe to reduce the amount of gas injected, A welding apparatus using a purge cap capable of reducing a welding cost is provided, There is.

In order to achieve the above-mentioned object, the present invention provides a welding machine comprising a first pipe having a first welding welded portion welded to one end of a tube body and a second welded joint portion welded to the other end secondarily, A second pipe having a first end surface corresponding to the first welded joint of the first pipe and having a welded surface welded to the first welded surface of the first pipe; And a third pipe having a welded portion welded thereto,

And a check valve is provided at a central portion of the pipe to be connected to the other side of the second pipe. A check valve is provided at one side of the pipe to allow a nitrogen gas to be introduced into the pipe at a predetermined pressure. The other pipe is open. A purge cap in which a sealing ring made of a silicone material is formed to prevent the gap from being inserted into the inner periphery; And

And a discharge port through which oxygen is discharged to the outside at a predetermined pressure is formed on the other side of the pipe, and the other side is opened, and the third pipe is connected to the third pipe And a discharge cap in which a sealing ring made of silicon is formed to seal the gap when the pipe is inserted into the inner periphery of the pipe.

The first welding of the first pipe is welded to the welding part of the second pipe, the second welding of the first pipe is fixed to the outer surface including the welding part of the third pipe by elasticity, During the welding operation to the welded portion of the secondary welded portion of the first pipe and the welded portion of the third pipe, the first welded portion of the first pipe is fixed to the outer surface including the welded portion of the second pipe by elasticity A silicon layer having a predetermined thickness of silicon is formed on the inner surface of the ring body, and a silicon layer having a predetermined thickness is formed on the inner surface of the ring body, And a purge covering unit for sealing each welded portion of the welded joint and the second and third pipe from the outside to prevent the outflow of the internal nitrogen gas and preventing the inflow of external oxygen.

A guide guide cap having a "∩" -shaped section is clogged in the direction of the inlet port and fixed to the second pipe side by a fixing bar so that nitrogen gas introduced into the inside of the purge cap at a certain pressure through the inlet port And at the same time prevents oxygen or nitrogen from being directed to the inlet.

Wherein the first pipe is a curved pipe, and at least one of the second pipe and the third pipe welded and fixed corresponding thereto is a curved pipe.

As described above, the present invention facilitates the introduction of nitrogen into the piping during welding of the pipe, prevents oxygen from flowing into the inside through the welded portion while preventing oxygen from flowing out to the opposite side, Since oxidation of welding part does not occur after welding of pipe, it is possible to maintain cleanliness because there is no impurities in welding part, and it is easy to seal the piping and maintain the strength of welding part intact, thus improving the durability of welding part of pipe. It is possible to easily weld the piping to the pipe and the bend pipe as well as to weld the pipe to the pipe of the straight pipe and the bend pipe to minimize the external loss of the nitrogen introduced into the pipe to reduce the amount of gas to be injected, It is effective.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a welding apparatus using a purge cap according to an embodiment of the present invention,
FIG. 2 is a sectional view of a welding apparatus using a purge cap according to an embodiment of the present invention, in which a first pipe is a bend and a second pipe is intact;
FIG. 3 is a sectional view of a welding apparatus using a purge cap according to another embodiment of the present invention, in which a first pipe is a bend and a first pipe is a bend;
FIG. 4 is a sectional view of a conventional welding purging jig in an installation state of an embodiment of the present invention,
5 is a perspective view showing a state of another embodiment of a conventional welding purge jig,
6 is a perspective view showing another embodiment of a conventional welding purge jig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the user, the intention or custom of the operator, and the like.

Therefore, it goes without saying that the definition should be based on the contents throughout this specification.

A welding apparatus using a purge cap according to the present invention is a welding apparatus having a secondary welded joint 42 having a primary welded joint 41 welded at one end to a first end of the tube body and secondary welded to the other end A second pipe 50 having a welded portion 51 whose one end is connected to the primary welded joint portion 41 of the first welded pipe 40 and is welded to the pipe, A third pipe 60 having a welded portion 61 whose one end is connected to the second welded joint 42 of the first pipe 40 so as to be in surface contact with the second welded joint 42, A purge cap 10 for introducing an inert gas into the first pipe 40 and a purge cap 10 for supplying inert gas through the purge pipe 10 to the second pipe 50, A discharge cap 20 for discharging the internal oxygen to the outside due to charging, and a purge covering 30.

The purge cap 10 is a tubular body coupled to the other side of the second pipe 50. The purge cap 10 is sealed at one side thereof and has a check valve 12 at a central portion thereof to supply a purge gas (neon, argon, etc.) An inlet port 11 through which inert gas, such as carbon dioxide gas, argon gas, and the like, which is a gas lacking in reactivity, is injected into the interior at a predetermined pressure is formed and the other side is opened, and on the other side, A sealing ring 13 made of a silicon material is formed to cover the gap. A guide guiding cap 14 having a cross section of an inverted U shape is clogged in the direction of the charging port 11 and opened to the side of the second pipe 50 in the other open side of the purge cap 10, To guide the inert gas, such as nitrogen gas, flowing into the inside through the inlet 11 at a constant pressure, while preventing the oxygen or the introduced nitrogen from being directed to the inlet 11.

The discharge cap 20 is a tubular body coupled to the other side of the third pipe 60. The discharge cap 20 is sealed at one side thereof and has a check valve 22 at a central portion thereof. The inert gas, which flows into the discharge cap 20 through the purge cap 10, And the other end is opened at the outer circumference of the third pipe 60 to seal the gap when the third pipe 60 is inserted into the inner circumference of the third pipe 60. [ A sealing ring 23 is formed.

The purging cover 30 has a secondary welded portion 44 at the time of welding operation to the welded portion 51 of the first welded joint 41 and the second welded portion 50 of the first pipe 40. [ And the welded portion 61 of the third pipe 60 is welded to the outer surface of the second pipe 60 by elasticity so as to seal the outer surface including the welded portion 61 and the welded portion 61, Is a ring body made of a SUS material having elasticity to be mounted and fixed by elasticity on the outer side surface including the primary welded joint 41 and the welded portion 51. The cut surface 31 is formed in one lateral side And a silicon layer 32 having a predetermined thickness of silicon is formed on the inner surface of the first and second pipes 40 and 40 so that the first and second welding welds 41 and 42 and the second and third pipes 50, and 60 are sealed from the outside, thereby preventing an inert gas such as nitrogen gas, which has been introduced into the inside, from flowing out to the outside, and preventing external inflow of external oxygen.

Although the first pipe 40 is a curved pipe and the second pipe 50 and the third pipe 60 welded and fixed thereto are illustrated as being straight pipes as shown in FIGS. 1 and 2, When the at least one of the second pipe 50 and the third pipe 60 is constituted by a fourth pipe 70 which is a curved line, the feature of the welding apparatus of the present invention becomes more prominent.

1 and 2, the first pipe 40, which is a curved pipe, and the second pipe 50, which is intruded by the purge cap 10, are welded to the second pipe 50 The first pipe 40 welded by the purge cap 10 and the inert gas such as nitrogen gas into the second pipe 50 can be more easily introduced into the third pipe 60, The oxygen in the first pipe 40, the second pipe 50 and the third pipe 60 is smoothly flowed out to the outside by the discharge cap 20, It is possible to prevent oxygen from flowing into the interior through the welded portions of the first pipe 40 and the third pipe 60 and to prevent the outflow of the inert gas such as nitrogen gas introduced into the first pipe 40, Since the oxidation of the welded portion does not occur after the welding operation of the first pipe 50 and the first pipe 40 and the third pipe 60, there is no impurity on the welded portion and the cleanliness can be maintained, The durability of the first piping 40 and the second piping 50 is improved and the sealing operation of the welded portions of the first piping 40 and the second piping 50 and the first piping 40 and the third piping 60 is made easier, As well as the piping welding of the straight pipe or the piping of the second pipe 50 or the third pipe and the first pipe 40 which is a curved line as well as the first pipe 40 of the first pipe 40, It is easy to weld the pipe to the welded joint 41 of the car welded joint 41 and the welded portion 71 of the fourth pipe 70 which is a bendable pipe and the like such as nitrogen gas flowing into the first pipe 40 and the fourth pipe 70 The external loss of the inert gas is minimized and the amount of the inert gas injected into the inside can be further reduced, thereby further reducing the welding cost of the piping.

10: purge cap 11: inlet
12: Check valve 13: Sealing ring
14: guide guide cap 15: fixed bar
20: discharge cap 21: discharge port
22: check valve 23: sealing ring
30: purge covering 31: cut surface
32: silicon layer
40: first pipe 41: primary weld joint
42: secondary welded joint
50: second pipe 51: welded part
60: third pipe 61: welded part
70: fourth pipe 71: welded part

Claims (4)

delete A first pipe having a first welded joint connected to one end of the pipe by a pipe and a second welded joint having a second welded joint connected to the other end of the pipe at one end thereof, A second pipe having a welded portion that is in surface contact and welded in correspondence with the joint portion; and a third pipe having a welded portion whose one end is in surface contact with the second welded joint of the first pipe, A purge cap which is hermetically sealed at one side by a pipe connected to the other side of the second pipe and has a check valve at a central portion thereof and in which a charging port into which nitrogen gas is injected at a predetermined pressure is formed and the other side is opened, In a welding apparatus using a purge cap which is hermetically sealed at one side thereof and has a check valve at the center thereof and has a discharge port in which oxygen is released to the outside at a predetermined pressure and the other end is opened book,
The first welding of the first pipe is welded to the welding part of the second pipe, the second welding of the first pipe is fixed to the outer surface including the welding part of the third pipe by elasticity, During the welding operation to the welded portion of the secondary welded portion of the first pipe and the welded portion of the third pipe, the first welded portion of the first pipe is fixed to the outer surface including the welded portion of the second pipe by elasticity A silicon layer having a predetermined thickness of silicon is formed on the inner surface of the ring body, and a silicon layer having a predetermined thickness is formed on the inner surface of the ring body, Further comprising a purge cover for sealing each welded portion of the welded joint and the second and third pipe from the outside to prevent the outflow of the internal nitrogen gas and preventing the inflow of external oxygen into the inside of the purge cap. Used welding equipment. A first pipe having a first welded joint connected to one end of the pipe by a pipe and a second welded joint having a second welded joint connected to the other end of the pipe at one end thereof, A second pipe having a welded portion that is in surface contact and welded in correspondence with the joint portion; and a third pipe having a welded portion whose one end is in surface contact with the second welded joint of the first pipe, A purge cap which is hermetically sealed at one side by a pipe connected to the other side of the second pipe and has a check valve at a central portion thereof and in which a charging port into which nitrogen gas is injected at a predetermined pressure is formed and the other side is opened, In a welding apparatus using a purge cap which is hermetically sealed at one side thereof and has a check valve at the center thereof and has a discharge port in which oxygen is released to the outside at a predetermined pressure and the other end is opened book,
A guide guide cap having a "∩" -shaped section is clogged in the direction of the inlet port and fixed to the second pipe side by a fixing bar so that nitrogen gas introduced into the inside of the purge cap at a certain pressure through the inlet port Is directed in the outward direction and at the same time, the oxygen or nitrogen in the inside is prevented from being directed to the inlet. delete

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