KR20170043251A

KR20170043251A - Method for rejecting and preventing occurrence of burr for friction stir welding apparatus

Info

Publication number: KR20170043251A
Application number: KR1020150142758A
Authority: KR
Inventors: 김상인; 안민홍; 이진혁; 김덕회
Original assignee: 에코프릭션웰딩 (주)
Priority date: 2015-10-13
Filing date: 2015-10-13
Publication date: 2017-04-21

Abstract

Disclosed is a burr removal and prevention method for a friction stir welding apparatus. The method of the present invention for removing and preventing burrs in a friction stir welding apparatus is characterized in that when a pair of first pipe members and a second pipe member are joined to each other by using a friction stir welding technique, And preventing burrs generated inside the first pipe member and the second pipe member from being buried in the first pipe member and the second pipe member, the method comprising: (a) (B) welding the first pipe member and the second pipe member to the burr removing unit in a state where the first pipe member and the second pipe member are heated to a predetermined temperature or higher by the friction stir welding, And removing the burrs or preventing burrs using the burrs. According to the present invention, it is possible to more easily remove the burrs generated inside the pipe member while the friction welding operation is being carried out, or at the same time or at an appropriate time, Can be improved.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a friction stir welding apparatus,

The present invention relates to a friction stir welding apparatus, and more particularly, to a friction stir welding apparatus capable of performing a friction stir welding operation or removing welding debris at a set time interval, The present invention also relates to a method for preventing the occurrence of burrs in a friction stir welding apparatus capable of processing an inner surface of a pipe member to be welded.

Generally, Friction Stir Welding (FSW) is a method of generating a plasticized zone from the contact surface of a member by generating a sufficient amount of heat using a friction principle, Thereby joining the members. The friction stir welding is a kind of solid-state bonding method in which a welded portion is heated by using heat generated by physical friction between a rotating tool and a material, and a plastic flow is formed in the heated material by using a pin formed at the end of the tool .

Such a friction stir welding technique is widely used for a material having a low melting point such as aluminum and magnesium because it is bonded at a temperature below the melting temperature and is clean and has excellent physical properties of a welded portion.

When a pair of tubular pipes are welded to each other by using a friction stir welding method, welding dirt is generated on the outer side and the inner side of the welded parts to be welded to each other. Such welding poop obstructs the fluid flow by blocking the inside of the pipe, so that the welding poop must be removed for fluid stability and smooth flow of the fluid. Meanwhile, the welding poop formed on the outer side of the pipe can be removed through a separate cutting machine, but the welding poop formed on the inner side of the pipe can not be removed immediately.

Conventionally, in order to remove welding poop formed inside the pipe, the welded pipe is moved to a separate punching machine and then an internal penetration operation is performed. During the friction welding operation, the welding strength is increased due to thermal changes Therefore, in order to perform the penetration work, a high-frequency heating operation is performed on the joint portion in advance.

As a result, the process becomes complicated due to the addition of a high-frequency heating operation and the rigidity of the heated portion of the pipe is weakened during the high-frequency heating operation. In addition, it is inconvenient to carry out additional centering work (centering work with a perforating tool and a pipe) for the substantial penetration after the friction welded pipe is transferred to a separate punching machine.

Korean Registered Patent No. 10-1384408 (registered on Apr. 04, 04)

Accordingly, it is an object of the present invention to solve such a problem, and it is an object of the present invention to provide a welding apparatus and a welding method capable of performing a friction stir welding operation or removing welding burrs at a set time interval, The present invention also provides a method for preventing the occurrence of burrs in a friction stir welding apparatus capable of processing an inner surface of a pipe member to be welded.

In order to achieve the above object, according to the present invention, when a pair of first pipe members and a second pipe member are joined to each other by using a friction stir welding technique, burrs generated inside the first pipe member and the second pipe member, (a) removing the first pipe member and the second pipe member from the first pipe member and the second pipe member to prevent burrs or preventing burrs from being generated inside the first pipe member and the second pipe member, And frictionally agitating and welding the interconnecting parts; And (b) removing the burrs or preventing burrs using the burr removing unit while the first pipe member and the second pipe member are heated to a predetermined temperature or higher by the friction stir welding The present invention provides a method of preventing burrs in a friction stir welding apparatus.

The step (b) includes the steps of: (b1) centering a part of the burr removing unit before the step (a) is performed, the same as that of the first pipe member or the second pipe member; And (b2) inserting a part of the centering-completed burr removing unit into the first pipe member or the second pipe member.

The step (b) may be performed simultaneously with the friction stir welding.

In the step (b), the burr may be removed by using a drill or a punching pin, or a weld generated during the friction stir welding may be prevented from being introduced into the first pipe member and the second pipe member have.

In the step (b), a part of the burr removing unit is positioned in the vicinity of the mutual joining part of the first pipe member and the second pipe member, and the first pipe member and the second pipe The bur can be removed while pushing or pushing the burr a plurality of times while reciprocating the inside of the member.

In the step (b), a part of the burr removing unit is positioned in the vicinity of the mutual joining part of the first pipe member and the second pipe member, and the first pipe member and the second pipe The burr may be melted and removed while reciprocating the inside of the member, or the burr may be removed by air cutting using high-pressure air.

Wherein in the step (b), a part of the burr removing unit is positioned inside the first pipe member and the second pipe member corresponding to the mutual joining portions of the first pipe member and the second pipe member So that the welding material generated during the friction stir welding can be prevented from being introduced into the first pipe member and the second pipe member.

A part of the burr removing unit that can be contacted with the weld may be made of a ceramic material having a melting temperature higher than the temperature of the weld.

Wherein the burr removing unit includes a first pipe member and a second pipe member which are provided in end regions of the first pipe member or the second pipe member and are capable of receiving a welding member guided to the inner circumferential surface side of the first pipe member and the second pipe member by driving the friction stir welding unit And a welding member receiving groove.

Wherein the first pipe member is formed to have the same inner diameter, and the second pipe member comprises: a pipe body having an inner diameter smaller than that of the first pipe member; And a pipe insertion end connected to an end of the second pipe body and insertable into the first pipe member, wherein the welding member receiving groove is provided at a connection portion between the pipe body and the pipe insertion end, The first pipe member and the second pipe member can be communicated with the connection portion between the first pipe member and the second pipe member.

According to the burr removal and occurrence prevention method of the friction stir welding apparatus of the present invention described above, it is possible to provide a friction stir welding apparatus and a friction stir welding apparatus, The burr can be removed more easily, so that the burr removal efficiency can be improved and the inner surface of the pipe member as a welding target can be processed.

In addition, during the friction welding operation, the introduction of the welding material to the inside of the pipe member is originally cut off, thereby preventing burrs from being generated on the inner surface of the pipe member, thereby eliminating the need for separate burr removing operations.

Further, since the friction stir welding operation is performed in a state where at least a part of the burr removing unit is inserted into the inside of the pipe member, a separate centering operation for removing the burr formed on the inner side of the pipe member is not needed, And the work can proceed.

In addition, the burr formed inside the pipe member can be removed by a drill with breakage or breakage, pushing by punching, oxygen plasma cutting, air cutting or the like. Therefore, the high frequency heating process The occurrence of thermal deformation of the pipe member can be minimized.

FIG. 1 and FIG. 2 are flowcharts showing a burr removal and prevention method of a friction stir welding apparatus according to an embodiment of the present invention.
3 is a view schematically showing a friction stir welding apparatus for carrying out a burr removal and occurrence prevention method of a friction stir welding apparatus according to an embodiment of the present invention.
FIGS. 4 to 8 are views showing various examples for carrying out a method of preventing burrs and failures of a friction stir welding apparatus according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know. Wherein like reference numerals refer to like elements throughout.

(Hereinafter, referred to as a "burr removing and preventing method") of a friction stir welding apparatus according to a preferred embodiment of the present invention is characterized in that a burr generated on the inner surface of a pipe during friction stir welding is rapidly It is possible not only to efficiently remove it but also to minimize burrs on the inner surface of the pipe in some cases.

Prior to the description below, the term "Friction Stir Welding" refers to a solid-state welding process using a frictional heat in which a material is welded by reverse flow in a material. Therefore, compared with melting welding such as arc welding, laser welding, and electron beam welding, And there is little deformation due to welding. Incidentally, friction stir welding is a technique in which a plurality of materials to be bonded are brought into contact with each other by using a phenomenon in which the deformation resistance of the material to be welded near the tool is lowered by the frictional heat generated between the rotating tool and the welded material . Here, when the material to be welded is in the form of a tube, welds due to melting of the materials to be welded rapidly solidify on the outer and inner surfaces of the tubular material to be welded during the friction stir welding operation, resulting in burrs. The present invention provides a structure that quickly and efficiently removes burrs generated during friction stir welding, and particularly prevents occurrence of burrs on the inner surface side. The term 'welded product' means a melt in a liquid state generated by melting a base material at the time of welding.

1 and 2 are flowcharts showing a burr removal and occurrence prevention method of a friction stir welding apparatus according to an embodiment of the present invention. FIG. 3 is a schematic view illustrating a burr removal and occurrence prevention method of a friction stir welding apparatus according to an embodiment of the present invention. FIGS. 4 to 8 are views showing various examples for carrying out a method of preventing burrs and failures of a friction stir welding apparatus according to an embodiment of the present invention. Referring to FIG.

Hereinafter, the present invention will be described with reference to Examples.

As shown in FIGS. 1 and 2, a burr removal and occurrence prevention method according to an embodiment of the present invention includes a pair of first pipe member 100 and a second pipe member 200 The burrs 300 burr formed inside the first pipe member 100 and the second pipe member 200 are removed or the first pipe member 100 and the second pipe member 200 are removed, To prevent the occurrence of burrs 300 toward the inner side.

Specifically, the burr removal and occurrence prevention method according to an embodiment of the present invention includes a step (S100) of preparing a first pipe member 100 and a second pipe member 200 and welding them by friction stir welding The burrs 300 are removed by using the burr removing unit 500 in the state where the first pipe member 100 and the second pipe member 200 are heated to a predetermined temperature or more by friction stir welding, (S200). &Lt; / RTI >

In step S200, a part of the burr removing unit 500, specifically, the burr removing part 510 to be described later is inserted into the first pipe member 100 or the second pipe member 200, And a step S220 of inserting a part of the burr-removing unit 500 that has been centered into the first pipe member 100 or the second pipe member 200 .

Therefore, according to the present invention, the welding shit can be removed at the same time as or when the friction stir welding operation is performed, so that the removing operation can be performed more easily and quickly.

3, the welding apparatus for carrying out the burr removing and preventing method according to the embodiment of the present invention includes a pair of first pipe members 100 and a second pipe member 200, (Not shown) that can fix and rotate the first pipe member 100, and a second rotation fixing unit (not shown) that fixes and fixes the second pipe member 200 A friction stir welding part 400 for friction stir welding the connection parts between the first pipe member 100 and the second pipe member 200 and a second rotation fixing part 400 for rotating the first and second pipe parts 100 and 200, At least a part of the first pipe member 100 and the second pipe member 200 are provided so as to be able to move at least partly inside the pipe member 100 or the second pipe member 200. When the friction stir welding unit 400 is driven, The burrs generated inside the semiconductor chip 200 are removed, And a burr removing unit 500 capable of preventing burrs from being generated inside the pipe member 100 and the second pipe member 200.

First, the first and second rotation fixing parts (not shown) are configured to move in a direction in which the first pipe member 100 and the second pipe member 200 are fixed, respectively. The first and second rotation fixing parts include a collet chuck structure capable of fixing the first pipe member 100 and the second pipe member 200, respectively, and press the respective pipe members in a direction approaching each other As shown in FIG.

More specifically, the first and second rotation fixing parts include a rotation motor capable of rotating the first pipe member 100 and the second pipe member 200, respectively, and a first pipe member 100 and a second pipe member (E.g., applicable as a gear-rack module, a cylinder, an LM guide, a ball screw, etc.) for moving the lugs 200 in a direction approaching or separating one another, It can be applied to a general structure used in a friction stir welding apparatus, so a detailed description thereof will be omitted.

3, the friction stir welding part 400 welds the first pipe member 100 and the second pipe member 200 to each other by friction stir and integrally welds the first pipe member 100 and the second pipe member 200, Friction stir welding is performed by friction heat generated between the first pipe member 100 and the surface of the second pipe member 200 and between the first pipe member 100 and the second pipe member 200, A shoulder rotating part 420 for rotating the friction stirrer shoulder 410 and a shoulder rotating part 420 for moving the friction stirrer shoulder 410 to the first pipe member 100 and the second pipe member 200 (430). That is, the first pipe member 100 and the second pipe member 200 are partially melted by the frictional heat generated between the first pipe member 100 and the second pipe member 200 in a state of being pressed and moved together with the friction stirrer shoulder 410,

3, the burr removing unit 500 is provided so as to be movable at least partially inside the first pipe member 100 or the second pipe member 200, and the friction stir welding part 400 The first pipe member 100 and the second pipe member 200 can be operated simultaneously to remove burrs generated inside the first pipe member 100 and the second pipe member 200. [ In addition, the burr removal unit 500 may selectively prevent burrs inward of the first pipe member 100 and the second pipe member 200 in advance.

The burr removing unit 500 includes a burr removing unit 510 which can be inserted into the first pipe member 100 or the second pipe member 200 to remove the burr 300 or prevent the burr 300, A rotating part 520 capable of rotating the rotating part 520 in a linear reciprocating manner to approach or separate the first pipe member 100 and the second pipe member 200, And includes a reciprocating unit 530 and a lifting unit 540 that lifts and rotates the rotating unit 520 and the reciprocating unit 530 with respect to the mounting floor.

First, the deburring unit 510 may be configured to cut or push the burrs 300 generated inside the welded portions of the first pipe member 100 and the second pipe member 200, for example, Before the friction stir welding is performed, it is sufficiently inserted into the first pipe member 100 and the second pipe member 200 to prevent the welding material generated in the friction stir welding from being guided to the inside of the pipe, It is possible to prevent it from occurring beforehand.

In other words, during the friction stir welding operation, the deburring 510 simultaneously removes the burrs 300 inside the first pipe member 100 and the second pipe member 200, The burr 300 can be removed in a state where the first pipe member 100 and the second pipe member 200 are heated to a predetermined temperature or higher by friction stir, so that the burr 300 can be more easily removed.

That is, in the present invention, in step S200, the deburring unit 510 of the burr removing unit 500 is located near the mutual joining position of the first pipe member 100 and the second pipe member 200, It is possible to remove the burr 300 while passing through the first pipe member 100 and the second pipe member 200 while passing or pushing the burr 300 a plurality of times.

In the present invention, after the positioning of the detergent 510 by the lifting portion 540 is completed by centering the center pipe of the first pipe member 100 and the second pipe member 200, There is an advantage that a separate additional centering operation is not required when the burr removing operation is actually performed. That is, when the friction stir welding part 400 is driven in the standby state for the burr removing operation in a state where the burr removing part 510 is centered in the correct position by the elevating part 540, can do. The deburring unit 510 may operate immediately upon stopping the operation of the friction stir welding part 400 to remove the bur.

When the burr 300 is removed by cutting or pushing the burr 300, the rotating unit 520 rotates the burr removing unit 510, In order to prevent the occurrence of burrs toward the inside, the burr removing unit 510 may not be rotated. The rotation unit 520 may be a kind of a driving motor, and is preferably applied to a servomotor capable of controlling the rotation in the forward and reverse directions and controlling the rotation speed freely.

It is preferable that the detaching unit 510 and the rotating unit 520 are provided with a detachable coupling structure so that the detachable unit 510 can be easily replaced when the detachable unit 510 is damaged or damaged.

Next, the reciprocating unit 530 linearly reciprocates the rotary unit 520 so as to approach or separate the first pipe member 100 and the second pipe member 200. Specifically, the reciprocating unit 530 can move the rotating unit 520 and the detergent 510 backward so as to be spaced apart from the pipe member for repairing, replacing, and standby for the detergent 510, For the burr removing operation, the rotating part 520 and the burr removing part 510 may be moved forward so that the burr removing part 510 is partially inserted into the pipe member. In the practice of the present invention, the reciprocating unit 530 can be applied to reciprocating a target body such as a cylinder, an L-guide module, a gear-rack module, a ball screw, or the like.

Next, the elevating and lowering unit 540 moves the rotating unit 520 and the reciprocating unit 530 up and down with respect to the mounting floor. Specifically, before the actual burr removing operation is performed, the rotating unit 520 and the reciprocating unit 530 430 to complete the centering adjustment operation between the deburring unit 510 and the pipe member. As with the reciprocating unit 530, the elevating unit 540 can also be adapted to reciprocate a target object such as a cylinder, an EL guide module, a gear-rack module, and a ball screw.

Hereinafter, the deburring unit 510 will be described in detail. First, a structure for removing the burr 300 by cutting or pushing will be described.

4 and 5, for example, the deburring unit 510 contacts the burr 300 generated inside the first pipe member 100 and the second pipe member 200, Or as a punching pin 512. The punching pins 512 and 512 may be of the same shape.

When the deburring 510 is applied to the drill 511, the drill 511 is shredded while cutting the burr 300 having a certain temperature or more by the friction stir during the friction stir welding. At this time, the rotation unit 520 rotates the drill 511 in the forward and reverse directions, thereby improving the efficiency of the burr removal operation.

When the deburring 510 is applied to the punching pin 512, the punching pin 512 likewise pushes the burr 300 having a certain temperature or more by friction stir welding during the friction stir welding, It is removed from the inner surface and removed. At this time, the reciprocating moving unit 530 can appropriately reciprocate the punching pin 512 along the longitudinal direction of the pipe member, thereby improving the efficiency of removing the burr 300.

5, in order to more reliably remove the burrs 300 attached to the inner surfaces of the first pipe member 100 and the second pipe member 200 in the embodiment of the present invention, the punching pins 512 It is preferable that a concave recessed portion is formed in the central region of the end portion.

Modifications of burr removal may be arc air cutting, or simple high pressure air cutting, plasma cutting, and the like. 6, the burr removing unit 510 includes oxygen and plasma nozzles (not shown) for melting and removing the burrs 300 generated inside the first pipe member 100 and the second pipe member 200 513). The oxygen and plasma nozzles 513 inject oxygen to the burrs 300 as a plasma jet and a working gas to cut and remove the burrs 300. The deburring 510 may include a plasma generator (not shown) for supplying a plasma jet to the oxygen and plasma nozzles 513 and an oxygen supply tank (not shown) for supplying oxygen, Will be omitted because they are obvious to those skilled in the art of the present invention. In addition, there is a difference in strength between the burr-generating portion and the welded portion, so that an air-cutting method of removing the burr using a high-pressure air stream may be used.

That is, in step S200 of the present invention, the deburring unit 510 of the burr removing unit 500 is located near the mutual joining position of the first pipe member 100 and the second pipe member 200, The burr 300 can be melted and removed while reciprocally moving inside the first pipe member 100 and the second pipe member 200.

As shown in FIG. 7, as another example, the burr removing unit 510 may be configured such that the burr 300 is generated inside the first pipe member 100 and the second pipe member 200 during the friction stir welding operation In order to prevent it from coming out. Specifically, the deburring unit 510 may be formed of a cylindrical ceramic rod 514 having an outer diameter equal to the inner diameter of the first pipe member 100 and the second pipe member 200, It is possible to prevent the welding material inserted into the connection portions of the first pipe member 100 and the second pipe member 200 from being introduced into the pipe member during welding. When the friction stir welding operation is completed, the deburring unit 510 may move backward and be detached from the pipe member.

That is, in step S200 of the present invention, the deburring unit 510 of the burr removing unit 500 is disposed above the mutual joining parts of the first pipe member 100 and the second pipe member 200 and the corresponding first pipe member 100 And the second pipe member 200 so as to prevent the welding material generated during the friction stir welding from being guided to the inside of the first pipe member 100 and the second pipe member 200 .

Meanwhile, during the friction stir welding, the first pipe member 100 and the second pipe member 200 are heated to a predetermined temperature or higher, and the generated welding material is also formed at a considerably high temperature. Due to such a high temperature, Preferably, the deburring unit 510 is made of a material having a certain level of heat resistance so as not to melt, and the same applies to the three cases described above.

Next, the burr 300 is not cut or pushed to remove it. Instead of a method in which a friction welding operation is performed in a state in which a cylindrical inner work preventing structure is inserted into a pipe member as described above, The occurrence of burrs is prevented.

The prevention of burrs in the above description and the following description means that burrs are prevented from being generated on the inner surfaces of the first pipe member 100 and the second pipe member 200, And burrs generated on the outer surface are removed by cutting through a separate burr remover (not shown).

8, the burr removing unit 500 is provided in the end region of the first pipe member 100 or the second pipe member 200 and is driven by the friction stir welding part 400, And a welding member receiving groove 550 capable of receiving a welding member guided to the inner circumferential surface side of the first pipe member 100 and the second pipe member 200. In this structure, when a friction stir welding operation is performed, a part of the welded material generated through partial melting of the welded portions of the first pipe member 100 and the second pipe member 200 is partially solidified at the outer surface of the pipe member The burr 300 may be formed of the same material as the burr 300. However, the remaining part of the burr 300 may be moved to the inside of the pipe member, Therefore, there is an advantage that no burr 300 is generated on the inner surfaces of the first pipe member 100 and the second pipe member 200.

8, the second pipe member 200 has an inner diameter smaller than that of the first pipe member 100, and the inner diameter of the second pipe member 200 is smaller than the inner diameter of the first pipe member 100. In other words, And a pipe inserting end 570 connected to the end of the second pipe body 560 and insertable into the first pipe member 100. [

The welding member receiving groove 550 is provided at a connecting portion between the pipe body 560 and the pipe inserting end 570 and is capable of communicating with the connecting portion between the first pipe member 100 and the second pipe member 200 So that the weld is received in the weld receiving groove 550 and is prevented from being exposed to the inner surface side of the pipe member.

In summary, the present invention can more easily remove burrs generated inside the pipe member in a state where a certain temperature or more is formed on the pipe member at the same time or with an appropriate time difference during the friction welding operation, The removal efficiency can be improved.

Further, according to the present invention, it is possible to prevent the occurrence of burrs on the inner surface of the pipe member by preventing the welding of the pipe to the inner side of the pipe member while the friction welding operation is performed, There is an advantage.

Further, since the friction stir welding operation is performed in a state where at least a part of the burr removing unit is inserted into the inside of the pipe member, a separate centering operation for removing the burr formed inside the pipe member is not required The burr removal operation can be performed more quickly.

Further, since the burr formed on the inner side of the pipe member can be removed by rupture and breakage of the burr, pushing by punching, or cutting by oxygen plasma, the present invention omits the high frequency heating process for burr removal The occurrence of thermal deformation of the pipe member can be further minimized.

Although the present invention has been described with reference to the accompanying drawings and the preferred embodiments described above, the present invention is not limited thereto but is limited by the following claims. Accordingly, those skilled in the art will appreciate that various modifications and changes may be made thereto without departing from the spirit of the following claims.

100: first pipe member 200: second pipe member
300: Burr 400: Friction stir welding part
500: burr removal unit 510:
520: rotating part 530: reciprocating part
540: lifting part 550: welding material receiving groove

Claims

When a pair of the first pipe member and the second pipe member are joined to each other by using the friction stir welding technique, burrs generated inside the first pipe member and the second pipe member are removed, A method for preventing burrs and preventing generation of burrs and burrs toward the inside of the second pipe member,
(a) preparing the first pipe member and the second pipe member and welding the interconnection parts by friction stir welding; And
(b) removing the burrs or preventing burrs using the burr removing unit in a state where the first pipe member and the second pipe member are heated to a predetermined temperature or higher by the friction stir welding; A method of preventing burr removal and occurrence of friction stir welding apparatus.

The method according to claim 1,
The step (b)
(b1) centering a part of the burr removing unit before the step (a) is performed in the same manner as the penetrating axis of the first pipe member or the second pipe member; And
(b2) inserting a part of the burr removing unit, which has been centered, into the first pipe member or the second pipe member. .

The method according to claim 1,
Wherein the step (b) is performed at the same time during the friction stir welding.

The method according to claim 1,
In the step (b), the burr may be removed by using a drill or a punching pin, or welding material generated during the friction stir welding may be prevented from being introduced into the first pipe member and the second pipe member And a method for preventing and removing burrs from a friction stir welding apparatus.

The method according to claim 1,
In the step (b), a part of the burr removing unit is positioned in the vicinity of the mutual joining part of the first pipe member and the second pipe member, and the first pipe member and the second pipe Wherein the burr is removed while pushing or pushing the burr a plurality of times while reciprocating the inside of the member.

The method according to claim 1,
In the step (b), a part of the burr removing unit is positioned in the vicinity of the mutual joining part of the first pipe member and the second pipe member, and the first pipe member and the second pipe Wherein the burr is melted and removed while reciprocating inside the member, and the burr is removed by an air cutting method.

The method according to claim 1,
Wherein in the step (b), a part of the burr removing unit is positioned inside the first pipe member and the second pipe member corresponding to the mutual joining portions of the first pipe member and the second pipe member Thereby preventing the welding material generated during the friction stir welding from being guided to the inside of the first pipe member and the second pipe member.

8. The method of claim 7,
Wherein a part of the burr removing unit that can be brought into contact with the weld material is made of a ceramic material having a melting temperature higher than the temperature of the weld material.

The method according to claim 1,
Wherein the burr removing unit comprises:
And a welding material receiving groove provided in an end region of the first pipe member or the second pipe member and capable of receiving a welding material guided to the inner circumferential surface side of the first pipe member and the second pipe member by driving the friction stir welding portion Wherein the friction stir welding apparatus is provided with a burr.

10. The method of claim 9,
Wherein the first pipe member has the same inner diameter,
Wherein the second pipe member comprises:
A pipe body having an inner diameter smaller than that of the first pipe member; And
And a pipe insertion end connected to an end of the second pipe body and insertable into the first pipe member,
Wherein the welded member receiving groove is provided at a connection portion between the pipe body and the pipe insertion end and is capable of communicating with a connection portion between the first pipe member and the second pipe member. How to remove and avoid burrs.