KR102186588B1 - Backing apparatus for friction stir welding and, installation methods thereof - Google Patents

Abstract

The present invention relates to a backing device for friction stir welding, and a method for installing the same. The backing device is installed inside a base material to support a load during welding when the base material having an inner space such as a pipe is welded. The backing device is a prefabricated type so as to be conveniently and easily transported, installed, and disassembled. Moreover, a length and a height of the backing device can be controlled by corresponding to the height of the inner space and the length of the base material.

Description

Backing apparatus for friction stir welding, and installation methods thereof

The present invention relates to a backing device for friction stir welding, and more specifically, when welding a base material having an internal space such as a pipe, it is installed in the internal space to support the load during welding, and because it is an assembly type, transport, installation and disassembly It is convenient and simple, and the length and height of the base material can be adjusted according to the length of the base material and the height of the inner space, and it is about a backing device for friction stir welding.

In addition, the present invention also includes a method of installing such a backing device.

In general, in friction stir welding, a tool consisting of a pin and a shoulder is inserted into a material to be welded while rotating at high speed under a load. It is a solid-phase joining method that realizes welding by softening the material by using the frictional heat generated in and simultaneously generating a high-temperature plastic flow to stir and mix some of the materials disposed on the left and right sides of the tool into the regions opposite to each other.

Since friction stir welding is performed below the melting point of the material, it is possible to prevent the occurrence of various defects that occur during melt welding.

And, during friction stir welding, a backing plate is installed under the base material. The backing plate supports the load applied during friction stir welding. Such a backing plate is disclosed in Korean Patent Application Laid-Open Nos. 10-2011-0078518 and 10-2012-0008802.

However, since the backing plate disclosed in the above publication has a flat plate shape, there is a problem that it cannot be used when welding a base material having an internal space such as a pipe. For example, when welding a pipe, a welding tool must be installed outside the pipe and a backing plate must be installed in the inner space of the pipe, but there is a problem that the flat backing plate is not suitable to be installed in the inner space.

The present invention has been proposed in order to solve the above-described problem, and an object thereof is to provide a backing device installed in the inner space to support a load during welding when welding a base material having an inner space such as a pipe.

Another object of the present invention is to provide a backing device that is easy to transport, install, and disassemble because it is an assembly type.

Another object of the present invention is to provide a backing device capable of adjusting the length and height corresponding to the length of the base material and the height of the inner space.

Another object of the present invention is to provide a method for installing such a backing device.

The backing device 200 for friction stir welding according to a preferred embodiment of the present invention is installed inside the base material to support a load generated during friction stir welding.

Specifically, the backing device 200 is formed by combining a plurality of unit units 100 with each other in the transverse direction. The unit unit 100 includes: a support 110 that directly contacts and supports the inner surface of the base material; A connection part 120 installed under the support part 110 and detachably coupled to the support part 110; And, it is installed under the connection portion 120 and a height adjustment unit detachably coupled to the connection portion 120; includes.

The height adjustment unit, the first height adjustment member 130 is detachably coupled to the connection portion 120, a plurality of first fastening holes 133 formed at a predetermined interval (g) in the vertical direction; And a second height adjusting member 140 installed under the first height adjusting member 130 and having a plurality of second fastening holes 143 formed at a predetermined interval g in the vertical direction. .

The first height adjustment member 130 is inserted into the second height adjustment member 140 or the second height adjustment member 140 is inserted into the first height adjustment member 130, and after adjusting the length of the insertion, By inserting and fastening the fastening pins 149 to penetrate the first and second fastening holes 133 and 143, the height of the unit unit 100 may be adjusted in units of intervals (g).

The height adjustment unit may further include a lower end. Specifically, the lower end, the support bar 151 installed under the second height adjustment member 140; And, a bolt rod 156 screwed to the support bar 151; may include.

By adjusting the length at which the bolt rod 156 is screwed to the support bar 151, the height of the unit unit 100 can be adjusted within a range smaller than the distance g. And, the bolt rod 156 is installed to be supported on the inner surface of the opposite side of the base material.

Rail grooves 121 and 123 may be formed respectively on the upper and lower surfaces of the connection part 120. Protrusions 111 and 131 inserted into the rail grooves 121 and 123 may be formed in the support 110 and the height adjustment part, respectively. Accordingly, the protrusions 111 and 131 may be slid and fastened to the rail grooves 121 and 123.

The plurality of unit units 100 are connected to each other by a fastening means 170.

형상의 체결부(171); 및, 제1 체결공(133) 또는 제2 체결공(143)에 삽입된 체결부(171)와 나사 결합되는 너트(173);를 포함할 수 있다. The fastening means 170 is inserted into the first fastening hole 133 or the second fastening hole 143 of the two unit units 100 adjacent at both ends, and threads are formed at both ends,

Shaped fastening portion 171; And a nut 173 screwed with the fastening part 171 inserted into the first fastening hole 133 or the second fastening hole 143.

Another aspect of the present invention, a method of installing a backing device for friction stir welding, includes the steps of: (a) assembling the unit unit 100, and adjusting the height of the unit unit 100 according to the height of the inner space of the base material; And, (b) after step (a), connecting a plurality of unit units 100 to each other in a transverse direction corresponding to the length of the base material.

The step (a) may include: (a1) first adjusting the height of the unit unit; And, (a2) the step of secondaryly adjusting the height of the unit unit; may include. In this case, the (a2) step is preferably a smaller control range than the (a1) step.

The present invention has the following effects.

First, when welding a base material having an internal space such as a pipe, it is installed in the internal space to support the load during welding.

Second, because it is an assembly type, it is convenient to transport, install, and disassemble.

Third, the length and height can be adjusted according to the length of the base material and the height of the inner space. In particular, it is possible to adjust the height first by using the first and second height adjustment members and to finely adjust the height by using the screw connection of the bolt rod.

1 is a perspective view showing that a backing device according to a preferred embodiment of the present invention is installed inside a pipe.
Figure 2 is a cross-sectional view showing that a backing device is installed inside the pipe and a clamping unit fixes the pipe.
3 is a perspective view showing a unit unit constituting a backing device.
4 is an exploded perspective view showing a unit unit.
Figure 5 is an exploded perspective view showing the coupling of two unit units using a fastening means.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventors appropriately explain the concept of terms in order to explain their own invention in the best way. Based on the principle that it can be defined, it should be interpreted as a meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only examples of the present invention, and do not represent all the technical spirit of the present invention, and various equivalents that can replace them at the time of application And it should be understood that there may be variations.

The present invention can be used to support the welding load by being installed in the inner space when friction stir welding the base material having the inner space from the outside. In the following, for convenience of explanation, a case of friction stir welding of a pipe will be described as an example. However, it should be understood that the scope of the present invention is not limited to a specific base material and includes cases applied to various base materials.

On the other hand, in the drawing, x, y, and z axes are added to aid understanding, and are axes of the Cartesian coordinate system and form a right angle to each other.

1 is a perspective view showing that a backing device according to a preferred embodiment of the present invention is installed inside the pipe, and FIG. 2 is a cross-sectional view showing that the backing device is installed inside the pipe and the clamping unit fixes the pipe.

As shown in the drawing, the backing device 200 includes a plurality of unit units 100 installed in the inner space of the pipe 1 and a clamping unit for fixing the pipe 1 from the outside.

A plurality of unit units 100 are connected to each other in the transverse direction so as to correspond to the length of the pipe 1. As shown in FIGS. 3 to 4, the unit unit 100 includes a support part 110, a connection part 120, and a height adjustment part. The unit unit 100 is made by assembling the support part 110, the connection part 120, and the height adjustment part detachably.

The support portion 110 is a portion that directly contacts and supports the inner surface of the pipe 1, and the upper surface thereof preferably has a curvature substantially equal to the curvature of the inner surface of the pipe. Since the support part 110 is detachably installed on the connection part 120, the support part 110 can be replaced according to the curvature of the pipe 1.

단면 형상을 갖는데, 이러한 단면 형상은 지지부(110)를 레일홈(121)에 슬라이딩시켜 설치하기에 편리하고, 지지부(110)가 위쪽으로 임의로 이탈하는 것을 방지할 수 있으므로 유리하다. A protrusion 111 is formed on the lower surface of the support 110 in a lengthwise direction (x direction). The protrusion 111 is

It has a cross-sectional shape, and this cross-sectional shape is advantageous because it is convenient to install by sliding the support part 110 into the rail groove 121, and it is possible to prevent the support part 110 from being arbitrarily separated upward.

단면형상을 갖고 레일홈(123)은

단면형상을 갖는데, 이러한 단면형상은 지지부(110)와 제1 높이조절부재(130)를 슬라이딩시켜 조립하기 용이하고 지지부(110)와 제1 높이조절부재(130)가 상하 방향으로 이탈하는 것을 방지할 수 있다.The connection part 120 is installed under the support part 110. Rail grooves 121 and 123 are formed long in the longitudinal direction (x direction) on the upper and lower surfaces of the connection part 120, respectively. The rail groove 121 is

Having a cross-sectional shape, the rail groove 123 is

It has a cross-sectional shape, and this cross-sectional shape is easy to assemble by sliding the support part 110 and the first height adjustment member 130 and prevents the support part 110 and the first height adjustment member 130 from deviating in the vertical direction. can do.

The height adjustment unit includes first and second height adjustment members 130 and 140 and a lower end.

The first height adjustment member 130 is a flat plate having a predetermined thickness. A protrusion 131 is formed at an upper end of the first height adjustment member 130 in the lateral direction (y direction). The protrusion 131 may be slid and fastened to the rail groove 123.

In addition, the first height adjustment member 130 is formed with a first fastening hole 133 in a plurality of rows and columns. That is, the first fastening hole 133 is formed at a predetermined interval g along the vertical direction (z direction) and at a predetermined interval s along the length direction (x direction).

The second height adjustment member 140 includes a hollow 141 and a second fastening hole 143. The hollow 141 is a portion into which the first height adjustment member 130 is inserted.

The second height adjustment member 140 is formed with a second fastening hole 143 in a plurality of rows and columns. That is, the second fastening hole 143 is formed at a predetermined interval g along the vertical direction (z direction) and at a predetermined interval s along the length direction (x direction). In this way, the second fastening hole 143 is formed at the same distance (g) (s) as the first fastening hole 133 in the vertical direction and the length direction. In addition, it is preferable that the diameters of the first and second fastening holes 133 and 143 are the same.

And, after the first height adjustment member 130 is inserted into the hollow 141, the first and second heights are adjusted by installing the fastening pins 149 to penetrate the first and second fastening holes 133, 143 The members 130 and 140 are fastened and the height of the unit unit 100 is adjusted in units of intervals (g). That is, by adjusting the length of the first height adjusting member 130 inserted into the hollow 141, the height of the unit unit 100 may be adjusted. In this case, the height adjustment is performed in units of the interval (g).

Meanwhile, in the above, it has been described that the first height adjustment member 130 is inserted into the hollow 141 of the second height adjustment member 140, but a hollow is formed in the first height adjustment member 130 and the second height adjustment The member 140 may be inserted into the hollow of the first height adjustment member 130.

The lower end includes a support bar 151 and a bolt bar 156. The support bar 151 is installed at the lower end of the second height adjustment member 140. At least two or more support bars 151 may be installed.

Further, a bolt hole is formed along the vertical direction (z direction) at the lower end of the support bar 151, and a bolt rod 156 is inserted into the bolt hole.

The bolt rod 156 includes a threaded portion 157 and a head portion 158. The screw part 157 is a part that is screwed with the screw thread of the bolt hole, and the height of the unit unit 100 can be finely adjusted by adjusting the screwed length. That is, by adjusting the height in units of intervals (g) using the fastening of the first and second height adjustment members 130 and 140, and adjusting the screwing length of the threaded portion 157, within a range smaller than the intervals (g) Height can be adjusted. Therefore, it is possible to easily and quickly adjust the height of the unit unit 100.

The head 158 is preferably formed in a spherical shape, but is not limited thereto.

형상의 체결부(171)와 너트(173)를 포함한다. 체결부(171)는 제1,2 체결공(133)(143)과 동일한 직경을 갖는 것이 바람직하다. The unit units 100 are connected to each other in the transverse direction by a fastening means 170, as shown in FIG. 5. Fastening means 170

It includes a fastening part 171 and a nut 173 of the shape. It is preferable that the fastening part 171 has the same diameter as the first and second fastening holes 133 and 143.

Threads are formed at both ends of the fastening part 171. The unit units 100 may be coupled to each other by being fastened with the nut 173 after the fastening part 171 is inserted through the first fastening hole 133. As an alternative to this, the fastening part 171 may be inserted through the second fastening hole 143 and then fastened with the nut 173. In addition, the fastening part 171 may be fastened to both the first and second fastening holes 133 and 143.

By fastening the fastening means 170, the support part 110 is in close contact with the support part 110 of the neighboring unit unit 100, and the connection part 120 is connected to the connection part 120 of the neighboring unit unit 100. The second height adjustment member 140 is in close contact with each other and the second height adjustment member 140 of the neighboring unit unit 100 is in close contact with each other, so that the overall structure is stable.

On the other hand, as shown in Fig. 2, the pipe 1 is fixed by a clamping unit. The clamping unit includes a lower support part 188 that supports the lower end of the pipe 1, a side support part 183 that supports and fixes both sides of the pipe 1, and an upper fixing part that presses and fixes both sides of the welding target area ( 181).

The side support 183 is reciprocally movable with respect to the side of the pipe 1, and the tip 184 is formed of a surface having the same curvature as the outer surface of the pipe 1. In addition, the tip 184 is preferably replaceable according to the curvature of the pipe (1).

The upper fixing part 181 is capable of reciprocating with respect to the welding target part, and the tip 182 of the upper fixing part 181 is made of a surface having the same curvature as the outer surface of the pipe 1. In addition, the tip 182 is preferably replaceable according to the curvature of the pipe (1).

Then, a method of installing the backing device 200 in the inner space of the pipe 1 will be described below.

First, the unit unit 100 is assembled, and the height of the unit unit 100 is adjusted according to the height of the inner space of the pipe 1. Assembly of the unit unit 100 is fastened by sliding the support portion 110 to the rail groove 121, and the first height adjustment member 130 is slid and fastened to the rail groove 123. And, after adjusting the length into which the first height adjustment member 130 is inserted into the hollow 141, the fastening pins 149 are inserted and fastened into the first and second fastening holes 133, 143, thereby increasing the height at intervals ( The height is adjusted in a range smaller than the interval (g) by adjusting the length of the bolt rod 156 to the bolt hole.

Next, a plurality of assembled unit units 100 are connected in the transverse direction. A plurality of unit units 100 are connected so that the connected unit unit 100 is the same as the length of the pipe 1 or longer than the length of the pipe 1.

The transverse connection may be made by inserting the fastening portion 171 of the fastening means 170 through the first fastening hole 133 of the neighboring unit unit 100 and then fastening it with a nut 173. . As an alternative to this, the transverse connection may be made by inserting the fastening part 171 through the second fastening hole 143 and then fastening it with a nut 173.

Subsequently, after the pipe 1 is positioned on the lower support part 188, the unit units 100 connected in the transverse direction are inserted into the inner space of the pipe 1. Next, the pipe 1 is fixed using a clamping unit. Specifically, both side support portions 183 are operated to support and fix both sides of the pipe 1, and both sides of the welding target portion 2 are pressed and fixed using the upper end fixing portions 181.

When the fixing work is completed, welding is performed by operating the head of friction stir welding (not shown in the drawing). In this case, the movement of the head may be performed according to the previously input coordinates. For example, when the coordinates of the start point and the coordinates of the end point are input, the head part may be welded while moving along a straight line connecting the two coordinates.

1: pipe 2: part to be welded
100: unit unit
110: support 111: protrusion
120: connection part 121, 123: rail groove
130: first height adjustment member 131: protrusion
133: first fastening hole 140: second height adjustment member
141: hollow 143: second fastening hole
149: fastening pin 151: support bar
156: bolt rod 157: threaded portion
158: head 170: fastening means
171: fastening part 173: nut
181: upper fixing part 182: the tip of the upper fixing part
183: side support 184: front end of side support
188: lower support
200: backing apparatus
g: The vertical gap between the first fastening holes and the vertical gap between the second fastening holes
s: Lengthwise spacing between the first fastening holes, and the lengthwise spacing between the second fastening holes

Claims (12)

delete delete In the backing device installed inside the base material during friction stir welding to support the load during welding,
The backing device is made by combining a plurality of unit units with each other in the transverse direction,
The unit unit,
A support for supporting by directly contacting the inner surface of the base material;
A connection part installed under the support part and detachably coupled to the support part; And,
Including; a height adjustment part installed under the connection part and detachably coupled to the connection part,
The height adjustment part,
A first height adjustment member detachably coupled to the connection portion, wherein a plurality of first fastening holes are formed at predetermined intervals (g) in the vertical direction and formed at predetermined intervals (s) in the length direction of the base material; And,
Including; a second height adjustment member installed under the first height adjustment member, a plurality of second fastening holes formed at a predetermined interval (g) in the vertical direction and a predetermined interval (s) in the length direction of the base material; and
The first height adjustment member is inserted into the second height adjustment member or the second height adjustment member is inserted into the first height adjustment member,
After adjusting the length of the insertion, by inserting and fastening a plurality of fastening pins to pass through the first and second fastening holes, the height of the unit unit is adjusted in units of intervals (g). The method of claim 3,
The height adjustment unit further includes a lower portion,
The lower part,
A support bar installed under the second height adjustment member; And,
Includes; bolt rods screwed to the support,
A backing device, characterized in that the height of the unit unit is adjusted within a range smaller than the distance (g) by adjusting the length at which the bolt rod is screwed to the support, and the bolt rod is installed to be supported on an inner surface opposite to the base material. The method of claim 4,
Rail grooves are respectively formed on the upper and lower surfaces of the connection part,
Protrusions inserted into the rail grooves are formed in the support part and the height adjustment part, respectively,
A backing device, characterized in that the protrusion is slid and fastened to the rail groove. The method according to any one of claims 3 to 5,
A plurality of unit units are connected to each other by a fastening means,
Fastening means,
Both ends are inserted into the first or second fastening holes of two adjacent unit units, and threads are formed at both ends,

A shaped fastening part; And,
A backing device comprising: a nut screwed with a fastening part inserted into the first fastening hole or the second fastening hole. (a) assembling the unit unit, but adjusting the height of the unit unit according to the height of the inner space of the base material; And,
(b) after the step (a), connecting a plurality of unit units to each other in the transverse direction corresponding to the length of the base material; including,
The unit unit is
A support part for directly contacting and supporting a welding target part of the inner surface of the base material;
A connection part installed under the support part and detachably coupled to the support part; And,
Includes; a height adjustment part installed under the connection part and detachably coupled to the connection part,
The step (a) is achieved by assembling the support part, the connection part, and the height adjusting part, and the height adjustment in step (a) is performed using a height adjusting part. The method of installing a backing device for friction stir welding. The method of claim 7,
The step (a),
(a1) first adjusting the height of the unit unit; And,
(a2) step of secondly adjusting the height of the unit unit; Including,
The step (a2) is characterized in that the adjustment range is smaller than that of the step (a1), the method of installing a backing device for friction stir welding. The method of claim 8,
The height adjustment part,
A first height adjustment member detachably coupled to the connection portion and having a plurality of first fastening holes formed in the vertical direction at a predetermined interval (g); And,
Including; a second height adjustment member installed under the first height adjustment member, a plurality of second fastening holes formed in the vertical direction at a predetermined interval (g),
In the step (a1), after adjusting the length at which the first height adjusting member is inserted into the second height adjusting member or adjusting the length at which the second height adjusting member is inserted into the first height adjusting member according to the inner height of the base material, , A method of installing a backing device for friction stir welding, characterized in that the height is adjusted in units of the interval (g) by installing a fastening pin to penetrate the first and second fastening holes. The method of claim 9,
The height adjustment unit further includes a lower portion,
The lower part,
A support bar installed under the second height adjustment member; And,
Includes; bolt rods screwed to the support,
The step (a2) is characterized in that the height of the unit unit is finely adjusted within a range smaller than the distance g by adjusting the length at which the bolt rod is screwed to the support part. The method of installing a backing device for friction stir welding. The method according to any one of claims 7 to 10,
The base material is a pipe,
A method of installing a backing device for friction stir welding, characterized in that the upper surface of the support is curved equal to the curvature of the inner surface of the pipe. The method of claim 11,
Including a clamping unit for fixing the pipe,
The clamping unit,
A lower support part supporting the lower end of the pipe;
A side support portion capable of reciprocating with respect to both side surfaces of the pipe and supporting and fixing the both side surfaces; And,
A method of installing a backing device for friction stir welding, comprising: an upper fixing portion capable of reciprocating with respect to both sides of the welding target portion and fixing by pressing both sides.

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