JP2008272768A - Double kin panel joints and structures - Google Patents

Abstract

An object of the present invention is to provide a joint structure and a structure for a double skin panel that improve productivity.
A joint joint for abutting double skin panels 11A and 11B in the width direction and performing friction stir welding on at least one of an upper surface plate side or a lower surface plate side with a fixed pin type friction stir welding tool, In the first double skin panel, the upper and lower joint portions 25 and 26 formed on the respective extensions of the upper surface plate 21 and the lower surface plate 22 are formed with inclined surfaces that are inclined outwardly in the out-of-plane direction. In the panel, an inclined surface inclined toward the inner side in the out-of-plane direction is formed, and the joint portions are fitted in the width direction, and the friction stir welding tool 1 is connected between the joint portions. A joint joint in which end ribs 24a and 24b for supporting a load are formed on one or both of the first and second double skin panels.
[Selection] Figure 1

Description

  The present invention is configured by joining a double-kin panel that joins double skin panels having a shape in which an upper surface plate and a lower surface plate are connected by a plurality of ribs, and a plurality of double skin panels joined by the joint. Concerning the structure.

  Recently, friction stir welding, which has less heat input compared to arc welding or the like and suppresses welding distortion, has been attracting attention for joining outer plates of railway vehicles and aircraft. FIG. 11 is a conceptual diagram showing a conventional joint joint for a double skin panel. In the double skin panels 100A and 100B as the members to be joined, the upper surface plate 101 and the lower surface plate 102 are connected by a plurality of inclined ribs 103, and vertical end ribs 104 are provided at the joining end portions. Then, the double skin panels 100A and 100B are arranged so that the joining end surfaces of the upper surface plate 101 and the lower surface plate 102 face each other as illustrated, and are joined by the friction stir welding tool 1 respectively.

The fixed pin type friction stir welding tool 1 is pressed by a stirring shaft (probe) 3 projecting from a rotating body 2 while a joint portion where upper surface plates 101 or lower surface plates 102 are butted together is rotated. The part moves along a continuous joining line. As a result, the joint portions of the double skin panels 100A and 100B flow behind the moving probe 3 because the surrounding material plastically flows by mechanical stirring. The plastic materials mixed with each other lose frictional heat and rapidly cool and solidify to complete the joining. In the double skin panels 100A and 100B, after the upper surface plates 101 are joined together, they are reversed and the lower surface plates 102 are joined together in the same manner.
JP 2004-042115 A

  Incidentally, FIG. 12 is a view showing the appearance of the railway vehicle structure. This railcar structure 200 is constructed by joining a side structure 201, a roof structure 202 and a frame 203 in the circumferential direction, and joining a wife structure 204 at the end in the longitudinal direction. In the side structure 201 and the roof structure 202, a plurality of long double skin panels 210 are abutted in the width direction (circumferential direction), and adjacent ones are friction stir welded over a distance of 20 to 25 m of the vehicle body length. . Therefore, the side structure 201 and the roof structure 202 of the railway vehicle structure 200 are constituted by double skin panels 100A and 100B as shown in FIG.

  However, the joint joints of the conventional double skin panels 100A and 100B are configured such that the joint joints face each other perpendicular to the in-plane direction (the horizontal direction when the plate materials to be joined are placed horizontally). Therefore, there is a problem in joining over a long distance. That is, at the time of friction stir welding, a jig for pressing the double skin panels 100A and 100B is necessary so that the butted surfaces do not have a gap and do not shift. Therefore, in addition to the jig for pressing in the in-plane direction, a jig to prevent displacement in the out-of-plane direction (vertical direction when the plates to be joined are placed horizontally) is necessary, and the joining work is complicated. As a result, workability was reduced. Even if many jigs are used, the dimensional control of the joining end faces to be joined over a long distance is strict, which increases the cost of the railway vehicle structure.

  Therefore, an object of the present invention is to provide a double skin panel joint and structure for improving productivity in order to solve such problems.

  The joint joint of a double skin panel according to the present invention is a double skin panel in which an upper surface plate and a lower surface plate are connected by a plurality of ribs arranged in the width direction, the double skin panels are butted together in the width direction, A joint joint for friction stir welding at least one of the face plate side or the bottom plate side with a fixed pin type friction stir welding tool, formed on the respective extensions of the upper surface plate and the lower surface plate of the double skin panel In one first double skin panel, the upper and lower joints are inclined surfaces that are inclined outward in the out-of-plane direction, and in the other second double skin panel, the inclined surfaces are inclined inward in the out-of-plane direction. Is formed, and the joint portion of the first double skin panel is fitted in the width direction with respect to the joint portion of the second double skin panel. The end ribs to support the load of the friction stir welding tool is sintered, characterized in that it is one which is formed in one or both of the first and second double-skin panels.

Moreover, it is preferable that the joint surface of the double skin panel which concerns on this invention WHEREIN: The inclined surface of the said junction part is a plane or a circular arc surface.
Further, in the joint joint of the double skin panel according to the present invention, the inclination angle of the inclined surface of the joint portion is 10 degrees to 60 degrees when the out-of-plane direction perpendicular to the upper surface plate or the lower surface plate is zero degrees. It is preferable to be within the range.
Further, in the joint joint of the double skin panel according to the present invention, the inclined arc surface of the joint portion has an inclination angle of 10 degrees when the out-of-plane direction perpendicular to the upper surface plate or the lower surface plate is zero degrees. And the curvature of the arc surface is preferably 0.7 L or more when the length of the arc surface is L.

Further, in the joint joint of the double skin panel according to the present invention, a protruding portion is formed on one of the upper surface plate and the lower surface plate of the first and second double skin panels on the extension of the upper surface plate or the lower surface plate, It is preferable that the overhang portion is sandwiched by a bobbin tool type friction stir welding tool so as to be friction stir welded.
In the joint joint for a double skin panel according to the present invention, one of the upper surface plate and the lower surface plate of the first and second double skin panels is provided with a projecting portion on the extension of the upper surface plate or the lower surface plate. It is preferable that the superposed protruding portions are joined by arc welding, laser welding, or laser hybrid welding.

  A structure according to the present invention is a double skin panel in which an upper surface plate and a lower surface plate are connected by a plurality of ribs arranged in the width direction, the double skin panels are butted together in the width direction, and the upper surface plate side or lower surface At least one of the face plate side is friction stir welded by a fixed pin type friction stir welding tool, and the upper and lower joints formed on the extensions of the upper surface plate and the lower surface plate of the double skin panel, One first double skin panel is formed with an inclined surface that is inclined outwardly in the out-of-plane direction, and the other second double skin panel is formed with an inclined surface that is inclined inwardly in the out-of-plane direction. The joint portion of the double skin panel is fitted in the width direction with respect to the joint portion of the second double skin panel, and the friction stir welding work is connected between the joint portions. The end ribs supporting the load, characterized in that it is one which is formed in one or both of the first and second double-skin panels.

  Therefore, according to the joint joint of the double skin panel which concerns on this invention, since the inclined junction part is faced | matched, the junction part of a 1st double skin panel fits in the width direction with respect to the junction part of a 2nd double skin panel. . Therefore, it is sufficient if there is a jig for pressing the double skin panel in the in-plane direction because the first and second double skin panels do not shift in the out-of-plane direction by pressing in the in-plane direction. Even without using a jig for preventing displacement, friction stir welding can be performed in an appropriate butted state of the joint joint. Further, since the inclined joints are brought into contact with each other, it is possible to reduce the accuracy of dimensional tolerances, thereby improving the productivity. Therefore, not only the double skin panel itself, which has improved the productivity by reducing the accuracy of dimensional tolerance, but also the jig can be simplified, and the production cost of the structure composed of the double skin panel can be reduced.

Next, an embodiment of a double skin panel joint according to the present invention and a structure to which the double skin panel is connected will be described below with reference to the drawings. FIG. 1 is a view showing a first embodiment of a joint for joining a double skin panel.
The double skin panels 11 </ b> A and 11 </ b> B of this embodiment are extruded hollow shapes, and have a truss structure by the upper surface plate 21 and the lower surface plate 22 and a plurality of inclined ribs 23 that connect the upper surface plate 21 and the lower surface plate 22. Yes. The double skin panels 11A and 11B are configured in the same manner, and are formed with a pair of joint joints as illustrated at both ends in the width direction (left and right direction in the drawing).

  The double skin panels 11A and 11B are for constituting the railway vehicle structure 200 shown in FIG. 12, and in particular, the joint is a shape for joining with the fixed pin type friction stir welding tool 1. It is what you did. Then, as shown in the drawing, the joined portions butted together are joined from the upper and lower sides by the friction stir welding tool 1, and for example, the upper surface plate 21 is on the outer side of the vehicle body of the railcar structure 200 and the lower surface plate 22 is on the inner side of the vehicle body. In the friction stir welding tool 1, a stirring shaft (probe) 3 is provided coaxially from a rotating body 2, and the probe 3 is pushed into the joint while being rotated, so that the material is softened and plasticized to be joined. It is a thing.

  The joints of the double skin panels 11A and 11B are provided with end ribs 24a and 24b perpendicular to the substantially parallel upper surface plate 21 and lower surface plate 22, respectively. Then, at the connecting portions of the upper surface plate 21 and the lower surface plate 22 and the end ribs 24a and 24b, joint portions 25, 25 and 26, 26 having mirror symmetry shapes are formed on the upper and lower sides where the inclined surfaces are formed. ing. The upper and lower joint portions 25 formed on the end rib 24a side are formed with inclined surfaces facing outward in the out-of-plane direction so as to receive the opposite joint portions 26. On the other hand, the upper and lower joint portions 26 formed on the end rib 24b side protrude so that the upper surface and the lower surface of the double skin panel 11B protrude, and an inclined surface facing inward in the out-of-plane direction is formed.

  Thus, the joint portions 25 and 26 protrude from the end ribs 24a and 24b with inclined surfaces having the same angle in the in-plane direction, and the joint portions 25 and 25 between the pair of upper and lower joint portions 26 and 26 are in the in-plane direction. It is configured to fit. A gap 28 is formed between the end ribs 24a and 24b at the joint between the fitted double skin panels 11A and 11B as shown in the figure.

  In the joint joint of the double skin panels 11A and 11B, the thicknesses of the end ribs 24a and 24b are different, and the thickness of the end rib 24a side where the joint portion 25 is formed is thick. This is because the friction stir welding is performed at a position where the central axis of the friction stir welding tool 1 is biased toward the end rib 24a. This is because the seams appearing on the surfaces of the double skin panels 11A and 11B must be frictionally stirred.

  As shown in FIG. 9, when the inclination angle θ of the inclined surfaces of the joint portions 25 and 26 is considered with reference to the central axis of the friction stir welding tool 1, if the inclination angle θ is large, the friction stir welding The in-plane width T of the joint is too large with respect to the diameter of the probe 3 of the tool 1. On the other hand, if the inclination angles of the joint portions 25 and 26 are small, the effect of fitting in the in-plane direction and enabling stable joining cannot be obtained sufficiently. Therefore, as a result of investigation, a preferable result was obtained when the inclination angle θ was between 10 degrees and 60 degrees.

Therefore, the joint joint of the double skin panels 11A and 11B configured as described above has solved the conventional problems and has improved productivity.
First, the joint portions 25 and 26 having inclined surfaces are fitted like wedges and pressed in the in-plane direction, so that the double skin panels 11A and 11B are not displaced in the out-of-plane direction. Therefore, it is sufficient if there is a jig for pressing the double skin panels 11A and 11B in the in-plane direction, and the friction stirrer can be performed with the joint joint properly butted without using a jig for preventing the out-of-plane displacement. It became possible to join. In particular, when the structure for a railway vehicle is constituted by the double skin panels 11A and 11B, the butted state as shown in FIG. 1 must be maintained for 20 m or more, but in this embodiment, only pressing in the in-plane direction is required. As a result, it became extremely easy to work.

In addition, by inclining the joint end faces of the joint portions 25 and 26, the permissible opening size in the in-plane direction is widened as compared to the butting of the vertical joint end faces. Therefore, when performing friction stir welding with the friction stir welding tool 1, it is possible to reduce the accuracy of dimensional tolerances on the joining end surfaces of the double skin panels 11A and 11B, thereby improving productivity. Became.
Therefore, not only the double skin panels 11A and 11B themselves that have reduced the production tolerance by reducing the accuracy of the dimensional tolerance, but also the production cost of the railway vehicle structure that can be manufactured by simplifying the jig can be suppressed. It was.

  Next, another embodiment of the joint joint will be described. 2 to 8 are views showing second to eighth embodiments of a joint for joining a double skin panel. The double skin panel is an extruded hollow member as in the first embodiment, and is composed of an upper surface plate 21, a lower surface plate 22, and a plurality of inclined ribs 23. A pair of joint joints as shown in the figure are formed at both ends in the width direction (left and right direction in the drawing). Therefore, the joint joint of the double skin panel is friction stir welded to form a railway vehicle structure 200 shown in FIG.

  The joint for joint of the second embodiment formed on the double skin panels 12A and 12B shown in FIG. 2 is provided with end ribs 31a and 31b having different thicknesses in the in-plane direction as in the first embodiment. Joints 32 and 33 are formed so as to protrude into the area. However, in this embodiment, the circular arc surface which inclined in the junction parts 32 and 33 is formed, and the upper and lower junction parts 32 and 32 and 33 and 33 are each formed in the mirror symmetrical shape. The inclination direction is the same as in the first embodiment, the joint portion 32 is formed facing outward in the out-of-plane direction, and the joint portion 33 is formed facing inward in the out-of-plane direction. Accordingly, the joint portions 32 and 33 are configured such that the joint portions 32 and 32 between the pair of upper and lower joint portions 33 and 33 are fitted in the in-plane direction.

  Here, as shown in FIG. 10, when the arc surfaces of the joint portions 32 and 33 are straight lines and the inclination angle θ is considered with respect to the central axis of the friction stir welding tool 1, the same as in the first embodiment. In addition, the oblique angle θ is preferably between 10 degrees and 60 degrees. Further, the curvature R of the arc surface is preferably 0.7 L or more when the length of the arc surface is L as shown in the figure.

  According to the present embodiment, the joint portions 32 and 33 having arcuate surfaces are fitted like wedges and pressed in the in-plane direction, so that the double skin panels 12A and 12B are not displaced in the out-of-plane direction. For this reason, even if the distance between the joint portions is long so as to constitute a railway vehicle structure, the joint can be made by simply pressing in the in-plane direction, which makes it extremely easy to work. In addition, due to the matching of the inclined circular arc surfaces, the in-plane opening size tolerance is wider than that of the vertical joining end surfaces, so that the accuracy of dimensional tolerances on the joining end surfaces can be reduced, thereby producing It became possible to improve the performance. Therefore, not only the double skin panels 12A and 12B themselves, which have been reduced in production accuracy by reducing the accuracy of dimensional tolerances, but also the production cost of a railway vehicle structure that can be manufactured by simplifying a jig can be suppressed. It was.

  The joint for coupling of the third embodiment formed on the double skin panels 13A and 13B shown in FIG. 3 is provided with end ribs 35 only on one side, and during friction stirring by the friction stir welding tool 1 (see FIG. 1). To receive the load. The other contact end is an open end without end ribs. The joint portions 36 and 37 are formed with inclined surfaces as in the first embodiment, and the upper and lower joint portions 36 and 36 and 37 and 37 are formed in a mirror-symmetric shape. Therefore, at the time of joining, the joining parts 36 and 36 are fitted between the pair of upper and lower joining parts 37 and 37 in the in-plane direction.

  Further, in the joint for joint of the fourth embodiment formed on the double skin panels 14A and 14B shown in FIG. 4, the end rib 41 is provided only on one side, and the friction by the friction stir welding tool 1 (see FIG. 1) is provided. The load at the time of stirring is received. The other contact end is an open end without end ribs. And the circular arc surface which inclined like the 2nd Embodiment is formed in the junction parts 42 and 43, and the upper and lower junction parts 42 and 42 and 43 and 43 are each formed in the mirror symmetrical shape. Therefore, at the time of joining, the joining parts 42 and 42 are fitted in the in-plane direction between the pair of upper and lower joining parts 43 and 43.

  Therefore, according to the third and fourth embodiments, the joint portion having the inclined surface or the arc surface is fitted like a wedge and pressed in the in-plane direction, so that the double skin panels 13A, 13B or 14A, 14B are No longer out of plane. Therefore, even if the distance between the joints is long so as to constitute a railway vehicle structure, it can be joined by simply pressing in the in-plane direction, and the workability is extremely easy. In addition, due to the matching of the inclined circular arc surfaces, the in-plane opening size tolerance is wider than that of the vertical joining end surfaces, so that the accuracy of dimensional tolerances on the joining end surfaces can be reduced, thereby producing It became possible to improve the performance. Furthermore, since the end rib of the joint portion is made one, the dimensional accuracy in the out-of-plane direction of the double skin panels 13B and 14B is lowered, but the weight can be reduced accordingly.

  The joint for joint of the fifth embodiment formed on the double skin panels 15A and 15B shown in FIG. 5 is provided with an end rib 45 only on one side so as to receive a load during friction stirring. In this embodiment, the upper surface plate 21 side is joined by the fixed pin type friction stir welding tool 1, while the lower surface plate 22 side is joined by the bobbin tool type friction stir welding tool. Then, joint portions 46 and 47 having inclined surfaces are formed on the upper surface plate 21 side, and overhang portions 48 and 49 are formed on the lower surface plate 22 side, and the inclined surfaces are formed with each other. It has been hit.

  In addition, the joint for joint of the sixth embodiment formed on the double skin panels 16A and 16B shown in FIG. 6 is also provided with the end rib 51 only on one side so as to receive the load at the time of friction stirring. The upper surface plate 21 side is joined by the fixed pin type friction stir welding tool 1, while the lower surface plate 22 side is joined by the bobbin tool type friction stir welding tool. Similar to the second embodiment, joints 52 and 53 having inclined arc surfaces are formed on the upper surface plate 21 side, and overhang portions 54 and 55 are formed on the lower surface plate 22 side, and the arc surfaces protrude from each other. It has been applied.

  Therefore, according to the fifth and sixth embodiments, the joint portion having the inclined surface or the arc surface fits like a wedge and presses in the in-plane direction, so that the double skin panels 15A, 15B / 16A, 16B It will not slip out of the plane. Therefore, even if the distance between the joints is long so as to constitute a railway vehicle structure, it can be joined by simply pressing in the in-plane direction, and the workability is extremely easy. In addition, due to the matching of the inclined circular arc surfaces, the in-plane opening size tolerance is wider than that of the vertical joining end surfaces, so that the accuracy of dimensional tolerances on the joining end surfaces can be reduced, thereby producing It became possible to improve the performance. Furthermore, since the end ribs of the joint portion are made one, the dimensional accuracy in the out-of-plane direction of the double skin panels 15B and 16B is lowered, but the weight can be reduced accordingly.

  The joint for coupling of the seventh embodiment formed on the double skin panels 17A and 17B shown in FIG. 7 is provided with end ribs 56a and 56b having different thicknesses. And while the upper surface plate 21 side is joined by the fixed pin type friction stir welding tool 1, the lower surface plate 22 side is joined by arc welding such as MIG welding or TIG welding, or laser welding or laser hybrid welding. It is a thing. Therefore, joint portions 57 and 58 having inclined surfaces are formed on the upper surface plate 21 side as in the first embodiment, and the inclined surfaces are abutted against each other. Further, projecting portions 59 and 60 are formed on the lower surface plate 22 side, and the projecting portion 59 side is configured to enter the inside of the projecting portion 60 as shown in the figure.

  Further, the joint for coupling of the eighth embodiment formed on the double skin panels 18A and 18B shown in FIG. 8 is provided with end ribs 61a and 61b having different thicknesses. In this embodiment, the upper plate 21 side is joined by the fixed pin type friction stir welding tool 1, while the lower plate 22 side is joined by arc welding such as MIG welding or TIG welding, or laser welding or laser hybrid. They are joined by welding. Therefore, on the upper surface plate 21 side, joints 62 and 63 having inclined arc surfaces are formed as in the second embodiment, and the arc surfaces are abutted against each other. Further, projecting portions 64 and 65 are formed on the lower surface plate 22 side, and the projecting portion 64 side is configured to enter inside the projecting portion 65 as shown in the figure.

  Therefore, according to the seventh and eighth embodiments, one of the upper and lower sides is overlapped, and the other is joined like a wedge with a joint having an inclined surface or an arc surface, and pressed in the in-plane direction. The skin panels 17A, 17B / 18A, 18B are not displaced in the out-of-plane direction. Therefore, even if the distance between the joints is long so as to constitute a railway vehicle structure, it can be joined by simply pressing in the in-plane direction, and the workability is extremely easy. In addition, since the tolerance of the opening dimension in the in-plane direction is widened by the butting of the inclined arc surfaces, compared with the butting of the vertical joining end surfaces, the accuracy of the dimensional tolerance can be reduced for the joining end surfaces. Furthermore, since the bottom plate 22 side to be joined later is arc welding or the like, the dimensional accuracy can be lowered also in this respect, and the productivity can be improved.

  As mentioned above, although embodiment was described about the joint joint and structure of the double skin panel which concern on this invention, this invention is not limited to these, A various change is possible in the range which does not deviate from the meaning.

It is the figure which showed 1st Embodiment about the coupling joint of a double skin panel. It is the figure which showed 2nd Embodiment about the coupling joint of a double skin panel. It is the figure which showed 3rd Embodiment about the coupling joint of a double skin panel. It is the figure which showed 4th Embodiment about the coupling joint of a double skin panel. It is the figure which showed 5th Embodiment about the coupling joint of a double skin panel. It is the figure which showed 6th Embodiment about the coupling joint of a double skin panel. It is the figure which showed 7th Embodiment about the coupling joint of a double skin panel. It is the figure which showed 8th Embodiment about the coupling joint of a double skin panel. It is the figure which showed the inclination-angle of the inclined surface formed in the junction part. It is the figure shown about the curvature of the circular arc surface formed in the junction part. It is the conceptual diagram which showed the conventional joint joint about the double skin panel. It is the figure which showed the external appearance of the structure for rail vehicles.

Explanation of symbols

1 Friction stir welding tool 2 Rotating body 3 Stirring shaft (probe)
11A, 11B Double skin panel 21 Upper surface plate 22 Lower surface plate 23 Ribs 24a, 24b End ribs 25, 26 Junction 200 Structure for railway vehicle

Claims (7)

A double skin panel in which an upper surface plate and a lower surface plate are connected by a plurality of ribs arranged in the width direction, the double skin panels are butted together in the width direction, and at least one of the upper surface plate side or the lower surface plate side is fixed pin In a joint for friction stir welding with a friction stir welding tool of the formula,
In the first double skin panel, the upper and lower joints formed on the respective upper and lower surface plates of the double skin panel are formed with an inclined surface inclined toward the outside in the out-of-plane direction, and the other In the second double skin panel, an inclined surface that is inclined inward in the out-of-plane direction is formed so that the joint portion of the first double skin panel fits in the width direction with respect to the joint portion of the second double skin panel. Is,
An end rib connected between the joints and supporting the load of the friction stir welding tool is formed on one or both of the first and second double skin panels. Skin panel joints. In the joint joint of the double skin panel according to claim 1,
The joint of the double skin panel, wherein the inclined surface of the joint is a flat surface or an arc surface. In the joint joint of the double skin panel according to claim 1 or claim 2,
The angle of inclination of the inclined surface of the joint portion is in the range of 10 degrees to 60 degrees when the out-of-plane direction orthogonal to the upper surface plate or the lower surface plate is zero degrees. Joint joint. In the joint joint of the double skin panel according to any one of claims 1 to 3,
The inclined arc surface of the joint portion has an inclination angle within a range of 10 degrees to 60 degrees when the out-of-plane direction orthogonal to the upper surface plate or the lower surface plate is zero degrees, and the arc surface The double-skin panel joint is characterized in that the curvature is 0.7 L or more when the length of the arc surface is L. In the joint joint of the double skin panel according to any one of claims 1 to 4,
One of the upper surface plate and the lower surface plate of the first and second double skin panels is formed with an overhang portion on the extension of the upper surface plate or the lower surface plate, and the overhang portion is a bobbin tool type friction stir welding tool. A joint joint for a double skin panel, characterized by being sandwiched and friction stir welded. In the joint joint of the double skin panel according to any one of claims 1 to 4,
One of the upper surface plate or the lower surface plate of the first and second double skin panels is provided with a protruding portion on the extension of the upper surface plate or the lower surface plate, and the overlapping protruding portion is arc welded or laser welded. Alternatively, a joint joint for double skin panels, which is joined by laser hybrid welding. A double skin panel in which an upper surface plate and a lower surface plate are connected by a plurality of ribs arranged in the width direction, the double skin panels are butted together in the width direction, and at least one of the upper surface plate side or the lower surface plate side is fixed pin In the structure subjected to friction stir welding by the friction stir welding tool of the formula,
In the first double skin panel, the upper and lower joints formed on the respective upper and lower surface plates of the double skin panel are formed with an inclined surface inclined toward the outside in the out-of-plane direction, and the other In the second double skin panel, an inclined surface that is inclined inward in the out-of-plane direction is formed so that the joint portion of the first double skin panel fits in the width direction with respect to the joint portion of the second double skin panel. End ribs connected between the joints and supporting the load of the friction stir welding tool are formed on one or both of the first and second double skin panels. A structure consisting of a characteristic double skin panel.

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