JP3449928B2 - Extruded profile joining method and extruded profile for joining - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to relates to a method for joining extruded profiles, particularly, a first face plate, a second face plate, and pressing Dekatachizai that have a pillar connecting in parallel the respective faceplate TECHNICAL FIELD The present invention relates to a method for joining extruded profile members for joining together, and an extruded profile member for joining used for the joining.

[0002]

2. Description of the Related Art In recent years, from the viewpoint of protecting the global environment or saving energy, it has been earnestly desired to suppress nitrogen oxides and carbon dioxide emitted from automobiles and improve fuel consumption. One of the most effective ways to achieve these is to reduce the weight of automobiles,
That is, use of a lightweight material is considered. Therefore, it has been considered to switch the material forming the body and parts of the automobile from steel to aluminum alloy. The aluminum alloy is not only lightweight, but can be increased in rigidity by optimizing the cross-sectional shape, and is suitable as a constituent member of transportation equipment.

However, aluminum alloys are often provided as extruded materials rather than as rolled plates such as steel. Since the extruded material is extruded through a die, the width of the profile is limited. When forming a wide profile or a large structure using an aluminum alloy, the extruded materials are joined by arc welding (MIG or TIG), but when arc welding is performed, the welded portion is deformed and a smooth surface shape is obtained. Be hindered.

For this reason, it is necessary to remove the extra portion formed at the time of welding at the site where the appearance is important. Also, when arc welding is performed, the heat input during welding causes the weld heat affected zone (H
AZ) is softened and the strength is reduced. Further, in arc welding, defects such as peculiar blowholes and solidification cracks may occur, and in this case, the welded portion is re-welded by repairing the defect. In this case, a lot of man-hours are required and the appearance of the welded portion becomes dirty.

In recent years, friction stir welding has been considered as a joining method with a small heat input and a low degree of softening and distortion (for example, Japanese Patent No. 2712838). In this method, a soft material such as an aluminum alloy is butted against a hard backing made of steel or the like, and the hard pin type tool is moved along the butted portion while rotating at high speed. This method is characterized in that the joint does not melt, and the temperature of the heat-affected zone outside the stirring section does not rise so much. Therefore, the strength of the joining member can be ensured relatively well.

In friction stir welding, a large-diameter shoulder portion and
When using a pin type tool consisting of a small diameter column protruding from the lower end of the shoulder and making the length of the column shorter than the thickness of the aluminum alloy to be joined, the side opposite to the side where the joining is performed The surface of the joining member of becomes smooth. Therefore, in the case of joining extruded shape members (so-called double skin members) having a first face plate, a second face plate, and columns that connect the face plates in parallel, for example, as described in JP-A-9-309164. It is conceivable to use such an extruded profile for joining (so-called inner cover).

That is, the first face plate is previously attached to the second face plate.
And a second face plate after the first process, in which the protruding edges of the first face plate are abutted against each other and friction stir welding is performed from the second face plate side. A second extruded profile member having a plate portion capable of bridging the second face plate so that the second face plate is bridged by the plate portion;
The extruded profile is joined by the step and the third step of friction stir welding the ends of the plate and the second face plates bridged by the plate. In this case, the surface of the first face plate on the side opposite to the side where the joining is performed in the first step is smooth. Therefore, by disposing this surface on the surface side of a vehicle or the like, a desired smooth surface shape can be obtained without doing anything other than simple polishing and cleaning.

[0008]

However, in the above joining method, not only the extruded profile members described above are directly joined, but also the extruded profile members for joining must be disposed between them to perform the joining. Therefore, when it is difficult to hold the extruded profile for joining at a desired position, the workability of the joining work is deteriorated. In particular, when there is a dimensional error in the extruded profile to be joined or a dimensional error occurs in the interval between the second face plates due to the first step, it is difficult to hold the extruded profile for joining in the above position. , The workability is significantly reduced.

Therefore, according to the present invention, a plurality of extruded profile members having a first face plate, a second face plate, and columns connecting the face plates in parallel can be easily joined while smoothing one surface. method for joining extruded profiles that may, was made for the purpose of providing a 及 beauty bonding the extruded profile.

[0010]

[0011]

[0012]

[0013]

[0014]

[Effect of the means and invention to solve the object described above
The invention according to claim 1, which is made to achieve the above, provides a plurality of extruded profile members having a first face plate, a second face plate, and a column connecting the face plates in parallel with each other. A method of joining extruded shape members, wherein the second face plates are joined so as to be arranged in the same plane, wherein the first face plate is formed in advance by projecting from the second face plate, First above
The protruding edges of the face plate of the
A first step of friction stir welding from the face plate side of the above, and an extruded profile for joining having a plate portion capable of bridging between the second face plates after the first step, the edge of the second face plate and the above A second step of arranging the plate parts at positions bridging between the second face plates by bringing preformed tapered parts into contact with the edges of the plate parts, and both ends of the plate parts and the plate. A third step of friction stir welding the respective second face plates bridged by the section.

[0015] In the present invention thus constituted, by abutting the edges between projecting the first surface plate friction stir joining from the second surface plate side, followed by extrusion bonding the second surface plates After bridging by the plate part of the shape, both are friction stir welded. Therefore, as described above, the surface of the first face plate becomes smooth, and a smooth surface shape suitable for forming the surface of a vehicle or the like can be obtained without doing anything other than simple polishing and cleaning. To be

Further, according to the present invention, the plate portions are placed between the second face plates by bringing the preformed tapered portions into contact with the edge of the second face plate and the edge of the plate portion of the extruded profile for joining. It is placed in a bridged position (second step). For this reason,
Even if there is some dimensional error in the extruded profile after joining in the first step or the extruded profile for joining, it is easy to arrange the plate ends of the extruded profile for joining between the second face plates. it can.
Further, since the second face plate and the plate portion are always in contact with each other at the tapered portion, the friction stir welding in the subsequent third step can be easily performed. That is, if the edge of the second face plate and both ends of the plate portion are vertically raised, and if there is any dimensional error, it is necessary to deform the extruded profile and fit the extruded profile for joining, Although a gap may be formed between the second face plate and the plate portion and friction stir welding may not be performed well, such a situation can be avoided in the present invention.

Therefore, in the present invention, as described above, the surface of the first face plate can be made smooth, and the work of joining the extruded shape members can be facilitated to improve the workability thereof.
The above effect can be obtained if the taper angle of the taper portion is small (that is, if the taper angle is larger than 0 °). However, in order to make friction stir welding in the third step easier and prevent defects from occurring better at that time, it is desirable that the taper angle be 45 ° or less. Further, the taper angle is preferably set to 30 ° or more, and in this case, the effect of improving the workability becomes more remarkable.

The invention according to claim 2 is the pusher according to claim 1.
In the joining method configuration of the molding material, in the second step,
The extruded profile for joining is fixedly engaged with the extruded profile,
The plate portion is bridged between the second face plates by the engagement.
It is characterized in that it is kept in a closed state. In the present invention,
After joining the protruding edges of the first face plate,
Fix the shaped material to the extruded material, and
The plate part is held in a state of being bridged between the second face plates.
(Second step). For this reason, the extruded profile for joining can be
Extruded profile after the 1st process is completed
The extruded profile for joining may come off from the gap or the position may shift.
Can be easily prevented. Therefore, in the present invention
Can further facilitate the work of joining the extruded shape members and improve their workability extremely well. Also, the present invention
Then, when performing the friction stir welding in the third step,
Since the above movement can prevent the material from moving, the joint
It is also possible to prevent a step or a gap from being generated.
Furthermore, in the present invention, the friction stir welding of the third step is performed from the lower side.
Even if it is performed, the extruded profile for joining will fall due to the above engagement.
Can be satisfactorily prevented. Therefore, the extruded profile
You can freely set the direction of arrangement in the factory.
It

The invention according to claim 3 is the invention according to claim 1 or 2.
In the method for joining extruded shape members described above, the tip of the protruding portion of the first face plate is previously formed to be thicker than other portions, and the heat-affected zone of the friction stir welding is formed inside the thick portion. It is characterized in that it is arranged in.

In the present invention, the tip of the protruding portion of the first face plate, that is, the portion that is abutted and friction stir welded in the first step is preliminarily formed to be thicker than the other portions, and the friction stir welding is performed. The heat affected zone is arranged inside the thick portion. It is known that the heat-affected zone of friction stir welding tends to have lower strength than other portions, but in the present invention, the heat-affected zone is disposed inside the thick portion. ing. Therefore, the decrease in the strength can be compensated by the thickness of the extruded profile.

Therefore, in the present invention, in addition to the effect of the invention described in claim 1 or 2, the effect that the joint strength of the joining member can be satisfactorily ensured is produced. Claim 4
The invention described in the joining method of the extruded profile according to any one of claims 1 to 3, wherein the friction stir welding in the third step is performed along the insertion direction of the extruded profile for joining. The feature is that it is performed while pressing.

In the present invention, the friction stir welding in the third step is carried out while pressing the joint portion along the insertion direction of the extruded profile for welding (that is, toward the first face plate). Therefore, even if the plate portion or the second face plate is lifted due to dimensional error or the like, it is possible to perform friction stir welding while pressing and deforming the plate portion or the second face plate.

Therefore, according to the present invention, in addition to the effect of the invention described in any one of claims 1 to 3, the friction stir welding in the third step can be more easily performed when there is a dimensional error or the like. As a result, there is an effect that the workability can be further improved. In particular, when the above configuration is added to the invention according to claim 2, slippage occurs between the tapered portions in response to the pressing, and dimensional error and the like can be absorbed better. Therefore, in this case, the workability can be further improved, and the surface shape on the second face plate side can be more favorably adjusted.

[0024]

[0025]

[0026]

[0027]

[0028]

[0029]

According to a fifth aspect of the present invention, the first face plate and the second face plate are provided.
An extruded profile for joining an extruded profile formed by projecting the first face plate projecting from the second face plate and having a pillar connecting the face plates in parallel with each other. A plate portion capable of bridging the second face plates after the joining when the projecting edges of the first face plate are butted against each other, and both end edges of the plate portion , First
And a taper portion that comes into contact with the edge of the second face plate .

As described above, the extruded profile material for joining of the present invention is provided with the plate portion and the tapered portion. Therefore, the first
Butt the protruding edges of the face plate of
If the plate portion is arranged between the second face plates after the joining, the tapered portion comes into contact with the edge of the second face plate. For this reason,
As described in relation to the invention described in claim 1, it is possible to easily dispose both ends of the plate portion between the second face plates of the extruded profile even if there is some dimensional error. It can be easily joined. Therefore, if the extruded profile for joining of the present invention is used, the workability can be improved. In particular, all of the above extruded profiles are attached to the edge on the side where the first face plate projects.
If you have a tapered portion may be a bonding method of the extruded profile of claim 1, wherein the (especially second step) was easily performed, favorably improve workability.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. In the following description, the case where the pair of extruded profile members 1 shown in FIG. 1 are connected using the extruded profile members 11 for joining will be described as an example.

The extruded profile 1 has a thickness of 2.
It is provided with a pair of face plates 3 and 5 of 5 mm, and one face plate 5 projects from both sides of the face plate 3. Between the face plates 3 and 5,
A swash column 7 and a column 9 having a thickness of 2 mm are arranged, and the swash column 7 and the column 9 keep the distance between the face plates 3 and 5 constant.
The pillar 9 is vertically lowered from both ends of the face plate 3 to the face plate 5, and the tip of the outermost oblique pillar 7 is connected to the connecting portion between the pillar 9 and the face plate 3. Further, a thick portion 5b is formed at the tip of the protruding portion 5a of the face plate 5 which protrudes from the face plate 3. Further, a hook-shaped engaging portion 9a that engages with the engaging portion 13 of the joining extruded shape member 11 is formed on the outside of the column 9. Furthermore, as shown in FIG.
A tapered portion 3a facing upward is formed.

In the present embodiment, the extruded profile 1 having such a cross-sectional shape is made of T5 of aluminum alloy 6N01.
By extruding the material, the overall height is 60mm,
It was molded into a width of 220 mm and a length of 15 m. On the other hand, the extruded profile for joining 11 is a plate part 15 capable of bridging between the face plates 3 of the pair of joined extruded profiles 1 when the end edges of the face plates 5 are joined to each other and the pair of joined parts. It is provided with a pair of hook-shaped engaging portions 13 that engage with the engaging portions 9a of the extruded profile 1 and is similarly formed by extrusion. A thick portion 15a is formed at both ends of the plate portion 15, and a taper portion 15b facing downward in FIG. 1 is formed at an edge of the thick portion 15a. The plate portions 15 other than the thick portion 15a have basically the same thickness as the face plate 3, but may have different thicknesses.

In the present embodiment, this pair of extruded profile members 1
The joined extruded profile 11 was joined by friction stir welding as follows. First, the edges of the protruding portions 5a of the extruded shape member 1 were butted against each other, and friction stir welding was performed from the side indicated by the arrow A (first step). Here, friction stir welding refers to FIG.
As schematically shown in Fig. 2, while restraining the protruding portions 5a by abutting them on a hard backing (not shown) such as steel, while rotating the hard pin type tool 28 at a high speed along the abutting portions. It is a joining method of moving.

As shown in FIG. 3, the pin type tool 28 is composed of a large-diameter shoulder portion 28a and a small-diameter column 28b protruding from the lower end of the shoulder portion 28a, and a driving force is supplied from a drive system (not shown). By being transmitted, it rotates around the central axis of the column 28b and moves along the abutting portion of the protrusion 5a. Then, at the abutting portion, as shown in FIG. 2, the stirring portion 30 is formed in which the metals forming the respective protruding portions 5a are stirred and joined by the columns 28b. Further, heat-affected parts 33 affected by the heat generated by the stirring are formed on the protrusions 5a outside the stirring part 30, respectively.

In the present embodiment, the diameter D of the shoulder portion 28a is 12 mm, the diameter d of the pillar 28b is 4 mm, and the length H of the pillar 28b is 90 to 95% of the thickness of the thick portion 5b. 28
Was driven at a rotation speed of 3000 rpm and a moving speed of 500 mm / min to perform friction stir welding. The projecting portion 5a is designed so that the heat-affected zone 33 formed at this time is entirely disposed inside the thick portion 5b. In addition, the length H of the pillar 28b is a range in which the stirring portion 30 is formed over the entire thickness direction of the protrusion 5a and the surface of the protrusion 5a (lower side in FIG. 2) is not impaired. Is the length of.

Returning to FIG. 1, subsequently, a joining extruded profile 11 was inserted between the pair of extruded profiles 1 after joining. That is, the pair of engaging portions 13 are engaged and fixed to the engaging portions 9a of each extruded shape member 1, and thereby the plate portion 15 is held in a state of being bridged between the pair of face plates 3 (second step). . Further, both ends of the plate portion 15 and the pair of face plates 3 were friction stir welded from the side indicated by the arrow B (third step). In addition, in this friction stir welding, as shown in FIG.
The overlapping portion of 5b is pressed by the roller 37, and the roller 37
Joining was performed by moving the pin type tool 28 attached after the.

As a result of observing the cross section of the joint portion of the joint member 50 obtained as described above, no defect was found. In addition, in the tensile test and the static four-point bending test of the entire joining member 50, the joining member 50 has face plates 3 and 5 separated from the joining portion.
It broke at. Further, as a result of the four-point fatigue bending test of the entire joint member 50, the face plates 3 and 5 apart from the joint part were fractured, and the fracture load was higher than that of the same shape member welded by MIG welding.

As described above, in the present embodiment,
The edges of the projecting portions 5a of the face plate 5 are abutted against each other and friction stir welding is performed from the side indicated by the arrow A. Subsequently, the face plates 3 are bridged by the plate portion 15 of the extruded profile 11 for joining, and then the plate portion 15 Both ends and the face plate 3 are friction stir welded. For this reason, the surface of the face plate 5 (the lower surface in FIG. 1) becomes smooth, and the desired smooth surface shape can be obtained without doing anything other than simple polishing and cleaning. Therefore, a joining member suitable for forming the surface of a vehicle or the like can be obtained.

Further, in the present embodiment, after the protruding portions 5a of the face plate 5 are joined together, the joining extruded profile 11 is fixed to the extruded profile 1 by the engagement of the engaging parts 9a and 13, and the engagement thereof is performed. According to the combination, the plate portion 15 is held in a state of being bridged between the pair of face plates 3. For this reason, the extruded profile for joining 11
Can be easily held at a desired position, and the joining extruded shape member 11 can be removed from the space between the pair of extruded shape members 1 having the protrusions 5a joined to each other, or the disposition position thereof can be displaced. It can be easily prevented. Therefore, the friction stir welding shown by the arrow B is facilitated, and by extension, the welding operation of the extruded profile 1 can be facilitated and the workability thereof can be improved.

Furthermore, when the joining extruded profile 11 is engaged and fixed as described above, the taper portion 3a and the taper portion 15b are provided.
And abut. Therefore, even if there is some dimensional error in the pair of extruded profile members 1 or the joining extruded profile members 11 after the protrusions 5a are joined together, the extruded profile member 11 for joining is provided between the pair of face plates 3. Both ends of the plate portion 15 can be easily arranged. Further, the face plate 3 and the plate portion 15 are tapered portions 3a and 15b.
Therefore, the subsequent friction stir welding can be easily performed. That is, when the edge of the face plate 3 and both ends of the plate portion 15 are vertically raised, if there is a dimensional error, it is necessary to deform the extruded profile 1 to fit the extruded profile 11 for joining, or the face plate. Although a gap may be formed between the plate 3 and the plate portion 15 and the friction stir welding may not be performed well, such a situation can be avoided in the present embodiment. Therefore, the workability can be further improved.

Further, in the present embodiment, since the friction stir welding is performed while pressing the roller 37, even if the plate portion 15 or the face plate 3 is lifted up due to a dimensional error or the like, the plate portion 15 or the face plate 3 can be connected to the taper portion 3a, Friction stir welding can be performed while sliding and deforming along 15b. Therefore,
The friction stir welding shown by the arrow B can be performed more easily, and the workability can be further improved. The taper angles of the taper portions 3a and 15b have the above-mentioned effects as long as they are attached (that is, if the taper angle is larger than 0 °). However, in order to make friction stir welding shown by arrow B easier and prevent defects from occurring better at that time, it is desirable that the taper angle be 45 ° or less. In this embodiment, the taper angle is set to 3
Since it is set to 0 °, the effect of improving the workability becomes more remarkable.

Further, in the present embodiment, when the friction stir welding shown by the arrow B is performed, the movement of the welding extruded profile 11 can be prevented by the engagement of the engaging portions 9a and 13, and the friction stirring The joining is performed while pressing the roller 37 as described above. Therefore, it is possible to prevent a step or a gap from being formed in the joint portion. The extruded shape member 1 is configured such that the vicinity of the tapered portion 3a pressed by the roller 37 is supported by both the slanted column 7 and the column 9. Therefore, even if friction stir welding is performed while pressing the roller 37 as described above, it is possible to favorably prevent the portion from buckling. However, in order to prevent the buckling more reliably, it is desirable to adjust the pressing force of the roller 37 so that the deformation rate of the extruded profile 1 becomes 0 to 5%.

Further, in this embodiment, even when the friction stir welding shown in FIG. 1 is turned upside down and the friction stir welding is performed from the lower side, the engaging extruded profile members are engaged by the engagement of the engaging portions 9a and 13a. The fall of 11 can be satisfactorily prevented. For this reason,
The arrangement direction and the like of the extruded profile 1 and the extruded profile 11 for joining in a factory can be freely set.

Furthermore, in this embodiment, the thick portion 5b formed on the projecting portion 5a of the face plate 5 is arranged so that the heat-affected portion 33 in the friction stir welding shown by the arrow A is arranged inside thereof. I am configuring. For this reason, the joint strength of the joining member 50 can be favorably ensured. Moreover, in the present embodiment, both ends of the face plate 3 and the plate portion 15 on which the friction stir welding shown by the arrow B is performed are also formed thick as shown in FIG. Therefore, as shown by the above-mentioned test results, the joint strength can be more favorably secured.

The present invention is not limited to the above-described embodiments, and can be implemented in various forms without departing from the scope of the present invention. For example, the extruded profile 1 and the joining extruded profile 11 are 6000 other than 6N01.
It may be made of a system alloy (Al-Mg-Si alloy), an aluminum alloy other than that, or a metal other than the aluminum alloy.

Further, the extruded profile 1 and the extruded profile 11 for joining.
Various shapes other than those shown in FIG. 1 are conceivable. For example, as shown in FIG.
May be configured to have a wide width, and the engaging portions 9a and 13 and the tapered portions 3a and 15b may have different shapes. When the extruded shape material 1 of this shape was made of T6 material of aluminum alloy 6061 and was joined in the same manner as in the above-mentioned embodiment and the joint portion was observed in cross section, no defect was found. Also,
In the tensile test and the static four-point bending test of the entire joining member 50, the joining member 50 is the face plates 3 and 5 separated from the joining portion.
It broke at.

[0049] Further, the engagement portion 9a or the engaging portion 13, if also configured engagable form generally common extruded profile 1 formed with the joining extrusions 11 or protrusions 5a of engagement The joining portion 13 or the engaging portion 9a can be omitted.

[0050] Furthermore, the extruded profile 1 and bonding the extruded profile 11, may be formed only of the tapered portion. Again, effects of the invention of claim 1 Symbol placement occurs. Further, the present invention is not limited to the case where the planar extruded profile 1 is joined to obtain the planar joining member 50 as shown in FIG. 1 or FIG. 5, and the extruded profile curved in an arc shape is joined. The present invention can be applied to various methods for joining extruded shape members, such as when a cylindrical joining member is obtained. In each of the above embodiments, the face plate 5 corresponds to the first face plate, the face plate 3 corresponds to the second face plate, and the slanted columns 7 and 9 correspond to the columns.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing configurations of an extruded profile and a joining extruded profile to which the present invention is applied.

FIG. 2 is an explanatory diagram showing friction stir welding applied to the joining of the extruded shape members.

FIG. 3 is a side view showing a configuration of a pin type tool used for the friction stir welding.

FIG. 4 is an explanatory diagram illustrating a method of performing friction stir welding while pressing with a roller.

FIG. 5 is a cross-sectional view showing a configuration of another extruded profile and a joining extruded profile.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Extruded shape member 3, 5 ... Face plate 3a, 15b ... Tapered part 5a ... Projection part 5b ... Thick part 7 ... Oblique column 9 ... Column 9a, 13 ...
Engaging portion 11 ... Extruded shape member for joining 15 ... Plate portion 28 ... Pin type tool 28a ... Shoulder portion 28b ... Pillar 33 ... Heat-affected zone 37 ... Roller
50 ... Joining member

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-9-309164 (JP, A) JP-A-10-175089 (JP, A) JP-A-9-221024 (JP, A) JP-A-6- 269877 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B21D 41/00 B23K 20/12 B61D 17/04

Claims (5)

(57) [Claims] 1. A plurality of extruded profile members having a first face plate, a second face plate, and columns connecting the face plates in parallel, wherein the first face plate and the second face plate are the same. A method for joining extruded shape members, which is joined so as to be arranged in a plane shape, wherein the first face plate is formed in advance by projecting from the second face plate, and the first face plate is projected. A first abutting end edge and friction stir welding from the second face plate side
And a taper formed by previously forming an extruded profile for joining having a plate portion capable of bridging between the step and the second face plate after the first step on the edge of the second face plate and the edge of the plate portion. A second step of arranging the plate portion at a position bridging between the second face plates by bringing the parts into contact with each other, and both ends of the plate portion and the respective second bridges bridged by the plate portion. A third step of friction stir welding with a face plate, and a method of joining extruded shape members, comprising: 2. In the second step, the extrusion type for joining is used.
Material is engaged and fixed to the extruded profile, and by the engagement, the above
The plate portion is held in a state of being bridged between the second face plates.
The method for joining extruded shape members according to claim 1, wherein 3. The protruding tip of the first face plate is
The extruded profile joining method according to claim 1 or 2, wherein the extruded profile is formed in a thicker thickness than other portions in advance, and the heat-affected zone of the friction stir welding is disposed inside the thick section. . 4. The friction stir welding in the third step,
The extruded profile joining method according to any one of claims 1 to 3, wherein the joining part is pressed while being pressed along the insertion direction of the extruded profile for joining. 5. An extruded shape member having a first face plate, a second face plate, and a column connecting the face plates in parallel, wherein the first face plate is formed to project from the second face plate. An extruded profile for joining, which is capable of bridging between the second face plates after the joining when the projecting edges of the first face plate are butted and joined. , Which are formed on both edges of the plate portion and contact with the edges of the second face plate.
An extruded profile for joining, comprising: a taper portion that is in contact with.