KR20020066818A - Friction stir welding method for structural body, structural body, and extruded shape member - Google Patents

Abstract

PURPOSE: A friction stir welding method for structural body, and extruded shape member for friction stir welding are provided to weld a hollow shape member from one surface thereof irrespective of dimension accuracy of the hollow shape member, and easily perform position determination of lap joint. CONSTITUTION: The friction stir welding method for structural body is characterized in that a plural ribs(13A,13B;23A,23B) are connected between two face plates(11,12;21,22), two hollow shape members(10,20) in which the end part of one side face plate(12,22) is more projected than the end part of the other side face plate(11,21) are prepared, each of the face plates on the outer surface of the hollow shape members are substantially flat, the projected face plates(12b,22b) are welded each other from the other side face plate by friction stir welding method, on connection plate substantially parallel to the projected one side face plate is lapped over the end part of the other side face plate of the respective hollow shape members, position of the connection member(30) for the hollow shape members is determined by the connection member or block parts(16,26) installed on the other side face plate during the overlapping, and friction stir welding is performed on the overlapped part from the outer side of the hollow shape members.

Description

FRICTION STIR WELDING METHOD FOR STRUCTURAL BODY, STRUCTURAL BODY, AND EXTRUDED SHAPE MEMBER

The present invention relates to a structure made of a hollow member and a method of manufacturing the same. For example, it is suitable for the production of a structure made of a hollow extruded shape member made of aluminum alloy used for a railway vehicle or a building.

The friction stir welding method is a method of solid-state joining by moving along a joining line while rotating a round rod (called a rotary tool) inserted into a joining portion to generate heat, soften and plastic flow the joining portion. The rotary tool consists of a small diameter part inserted into the joint and a large diameter part located outside. Small diameter and large diameter are coaxial. The boundary between the small diameter part and the large diameter part is slightly inserted in the joint. This is shown in Japanese Patent Laid-Open No. 9-309164 (EP 0797043A2).

9 of this document shows that the joining of two surfaces of the hollow extruded shape member is performed from one surface. In addition, a seam for preventing deformation of the hollow member is shown.

Consider the case where the frictional stir welding of the hollow member is made from one side as shown in Fig. 9 of Japanese Patent Laid-Open No. 9-309164 (EP 0797043A2). In this case, the accuracy of the gap between the upper plates 33 and 33 of the two hollow members 31 and 32 (that is, the gap between the recesses 39 and 39) and the width of the joint 60 arranged in this portion are It is important. If the space | interval of the upper surface plates 33 and 33 is smaller than the width of the joint 60, the joint 60 cannot be arrange | positioned. On the contrary, when the space | interval of the upper surface plates 33 and 33 is larger than the width of the joint 60, friction stir welding is difficult. In other words, it is important that the gap between the butt portion between the plate 33 and the joint 60 is small.

However, a large gap tends to occur from the manufacturing tolerances of the extrusion processing of the hollow members 31 and 32 and the joint 60. This is remarkable in the case of joining together a plurality of hollow members as in the case of joining a vehicle body of a railway vehicle.

On the other hand, it is conceivable to laminate the joint 60 to the recess 39. According to this, the space | interval (interval of board 33,33) of the recessed parts 39 and 39 can be made larger than the joint 60, and the hollow shape members 31 and 32 can be manufactured easily.

However, it bends in the connection part of the board 33 and the recessed part 39. FIG. For this reason, stress is concentrated in this part, and generation stress rises. In addition, since friction stir welding is performed in the vicinity of the bent portion, the strength is lowered under the influence of heat caused by the joining. As these strength decreasing factors rise, the allowable stress is greatly reduced.

An object of the present invention is to enable a hollow member to be joined from one side, regardless of the dimensional accuracy of the hollow member.

A second object of the present invention is to enable easy positioning of overlap joints.

The object is to connect two face plates between a plurality of ribs, and to prepare two hollow profile members whose ends of one face plate protrude from the ends of the other face plate, each of the face plates on the outer surface of the hollow shape member. Is substantially flat, and the protruding face plates are joined together by friction stir welding from the other face plate side, and then one connecting plate substantially parallel to the protruding one face plate of each of the hollow shaped members. It overlaps with the end of the said other face plate of, and when this overlaps, the said connection member with respect to the said hollow member is located by the convex part provided in the said connection member or the said other face plate, and the said overlapped part of the said hollow shape member This can be achieved by performing friction stir welding from the outside.

The second object overlaps an end portion of the first member with an end portion of the second member, and when the overlapping portion overlaps the first member with respect to the second member by a convex portion provided on the first member or the second member. This position can be achieved by friction stir welding the overlapped portion.

1 is a longitudinal sectional view of a main portion of a junction of an embodiment of the present invention;

Figure 2 is a longitudinal cross-sectional view of the junction of an embodiment of the present invention,

3 is a longitudinal sectional view of one set of hollow members of one embodiment of the present invention;

4 is a perspective view of a vehicle body of a railway vehicle,

5 is a longitudinal sectional view of a main part of another embodiment of the present invention;

6 is a longitudinal sectional view of a main part of another embodiment of the present invention;

7 is a longitudinal sectional view of main parts of another embodiment of the present invention.

※ Explanation of symbols for main parts of drawing

10, 10C, 20: hollow member

11, 11C, 12, 11b, 12C, 21, 22, 22b: faceplate

Rib: 13, 13A, 13B, 13C, 23, 23A, 23B

16, 19, 26, 28, 29: convex portion 30: connecting member

35, 37: convex portion 39: concave portion

201: side structure 202: roof structure

203: underframe 240: bed

250: rotary tool

An embodiment of the present invention will be described with reference to FIGS. In the following description, the part number which is not described in FIG. 1 may be used. In that case, the part number obtained by subtracting 10 from the part number corresponds to the part of the right half part number. 1 is an enlarged view of the main part of FIG. 2, FIG. 2 is an enlarged view of the main part of FIG. 3, and FIG. 3 is a longitudinal sectional view of the main part of the side structure of FIG. 4.

The vehicle body 200 includes a side structure 201 constituting a side, a roof structure 202 constituting a roof, an underframe 203 constituting a floor, and a gable structure 204 constituting a longitudinal end. The side structure 201, the roof structure 202, and the underframe 203 are each formed by joining a plurality of extruded shape members. The longitudinal direction of the extruded shape member is the longitudinal direction of the vehicle body. The extruded shape member is a hollow shape member made of aluminum alloy.

The structure and joining method of the hollow shape members 10 and 20 which comprise the side structure 201 are demonstrated. The same applies to other places and other structures.

The hollow members 10 and 20 consist of two face plates 11, 12; 21 and 22 and a plurality of ribs 13 and 23 arranged in a truss shape. The two face plates 11, 12; 21, 22 are substantially parallel. The pitch of the trusses by the ribs 13 and 23 is the same. The truss is comprised by the center line of the plate thickness of the ribs 13 and 23 and the face plates 11 and 12; The vertices are on the face plates 11, 12; 21, 22.

Near the apex of the truss inside the car, rails 19 and 29 for installing the device are integrally installed. The rails 19 and 29 consist of two L-shaped members. The rail serves as an installation place for equipment such as a built-in plate or a chair.

End portions of the face plates 12 and 22 located on the outer surface side of the vehicle body protrude from the hollow members 20 and 10 adjacent to the ends of the face plates 11 and 21 inside the car. This protruding face plates are called 12b and 22b. The end faces of the face plates 12b and 22b are abutted by friction stir welding. The gaps between the butts are smaller. The plate thickness of the face plates 12b and 22b is thicker than the plate thickness of the face plates 12 and 22 in other parts.

The hollow members 10 and 20 are placed on the bed 240 with the face plates 12 and 22 downward. The face plates 11 and 21 are faced upward. The rotary tool 250 is inserted into the joint portion from the top to perform friction stir welding. Friction stir welding from the inside of the car can be said.

At the ends of the face plates 12b and 22b, there are convex portions 16 and 26 that protrude toward the inside of the vehicle (that is, the face plates 11 and 21 side). The width heights of the convex portions 16 and 26 are substantially the same.

The end of the face plate 11 inside the vehicle and the end of the face plate 21 are joined via a connecting member 30. The connection member 30 is mounted on the face plates 11 and 21 (overlaid). The junction is at the intersection of the ribs 23A, 13A and the ribs 23B, 13B. At both ends of the connecting member 30 there is a convex portion 35 projecting upward. The upper surface of the convex portion 35 has a V-shaped groove 36. The groove 36 is at the center of the width of the convex portion 35. The width of the convex portion 35 is larger than the diameter of the large diameter portion 252 of the rotary tool 250. The groove 36 is an object for position detection for guiding the rotary tool 250. The groove 36 is detected by a laser sensor so that the shaft center of the rotary tool 250 coincides with the groove 36. There is an intersection of two ribs 13A, 23A and 13B, 23B on an extension line of the groove 36, that is, on the axis of the rotary tool 250.

On the surface on the opposite side to the convex portions 35 and 35, there are convex portions 37 and 37. The spacing of the convex parts 37 and 37 is smaller than the spacing of the ends of the face plates 11 and 21. The width of the convex portion 37 is smaller than the width of the convex portion 35.

The overlapping surface of the connection member 30 and the face plates 11 and 21 is flat and there is no undulation, and both contact. The connection member 30 is an extruded shape member of the same material as the hollow shape members 10 and 20. The length of the connection member 30 is the same as the length of the hollow member (10, 20).

The distance P from the end of the face plate 11 to the end of the face plate 21 (the distance from the apex of the truss at the end of the hollow shape member to the apex of the truss at the end of the hollow shape 20) is a truss at another position. Is equal to the pitch P of. The truss of the hollow member is an isosceles triangle when the side plates 11, 12; 21, 22 are used as vertices. However, the trusses at the ends of the hollow members 10 and 20 are not isosceles triangles. The angle formed by the ribs 13A and 23A constituting the trusses at the ends of the hollow members 10 and 20 with respect to the vertical line is θ1. The angle which the ribs 13A and 23B which comprise the truss of the said end make with respect to a perpendicular line is (theta) 2. θ1 <θ2.

For this reason, the ribs 13A and 23A are connected in the middle of the face plates 12 and 22. A space for inserting the friction stir welding device is formed between the connecting portion of the rib 13A and the face plate 12 and the connecting portion of the rib 23A and the face plate 22.

Since the ribs 13A and 23A are erected (θ1 is smaller) than the ribs 13B and 23B, the plate thicknesses of the ribs 13A and 23A are larger than the plate thicknesses of the ribs 13B and 23B. The plate thickness of the ribs 13B and 23B is larger than the plate thickness of the other ribs 13. The connecting portion of the ribs 13A, 13B, 13 and the face plates 11, 12; 21, 22 is arcuate. In addition, the thickness of the connection part is determined from the viewpoint of strength.

The construction method of this structure is demonstrated. The hollow members 10 and 20 are mounted on the bed 240 and fixed. The abutting portions of the ends of the face plates 12b and 22b are in contact with or in proximity to each other. The convex portions 16 and 26 of the butt portions of the face plates 12 and 22 are temporarily fixed by arc welding from above. Temporary fixation welding is intermittent.

The upper surface of the bed 240 on which the butts of the face plates 12b and 22b are placed is flat. Near the abutment of the face plates 12b, 22b, near the intersection of the ribs 13A, 23A and the face plates 12b, 22b, and near the intersection of the ribs 13B, 23B and the face plates 12, 22 with the same height. It is placed on the bed 240.

In this state, the rotating tool 250 of the friction stir welding device is moved along the joining line in a state where the rotary tool 250 is inserted from the upper side to the butt portion of the convex portions 16 and 26, and then friction stir welding. The axis of the rotary tool 250 is in the vertical direction (direction along the normal of the joint). However, in the advancing direction of the rotary tool 250, the shaft center is inclined as known. The abutment portions of the two convex portions 16, 26 are detected by the sensor to find the position of the gap of the butt portion, and the shaft center of the rotary tool 250 is positioned in this gap.

The rotary tool 250 is composed of a large diameter portion 252 and a small diameter portion 251 at its tip. The tip of the small diameter portion 251 is located near the lower surface of the face plates 12b and 22b. The lower end of the large diameter part 252 is located between the top of the convex parts 16 and 26 and the inside surface (face of the face plates 11 and 21 side) of the face plates 12b and 22b. The diameter of the large diameter portion 252 is smaller than the width consisting of the two convex portions 16 and 26. The small diameter part 251 is a screw.

By this friction stir welding, the gap between the butt parts of the face plates 12b and 22b is filled and joined. The outer surface side of the butt portion (outside the car) is joined flatly. There is no concave portion of the joining line on the outer surface side of the face plates 12b and 22b.

The upper surfaces of the convex portions 16 and 26 are concave by the large diameter portion 252 of the rotary tool 250. On both sides of the recess there is an unbonded portion.

Next, the connecting member 30 is placed on the face plates 11 and 21. The amount of overlap of the connection member 30 and the face plates 11 and 21 by the convex parts 37 and 37 becomes a predetermined amount. Next, the ends of the connecting member 30 are temporarily fixed to the face plates 11 and 21 by arc welding. Temporary fixation welding is intermittent. This is fillet welding.

Next, the joint member 30 and the face plates 11 and 21 are overlapped by using the friction stir welding device used for the friction stir welding of the butt portions of the face plates 12b and 22b. The rotary tool 250 is moved by friction stir welding by moving along the joining line (that is, along the groove 36) in a state where the rotary tool 250 is inserted into the overlapping portions of the connecting member 30 and the face plates 21 and 11 from above. The seam is in the longitudinal direction of the profile.

The width of the convex portion 35 is larger than the diameter of the large diameter portion 252 of the rotary tool 250. The groove 36 is at the center of the width of the convex portion 35. The axis of rotation of the rotary tool 250 coincides with the groove 36. For this reason, the position of the rotary tool 250 is an inner position which has the part which is not friction stir welded to the edge part of the connection member 30. FIG. The tip of the small diameter portion 251 of the rotary tool 250 is inserted deeper than the outer surfaces of the face plates 11 and 21. Thereby, overlapping joining is performed. The lower end of the large diameter portion 252 is between the upper surface of the non-convex portion connecting member 30 and the top of the convex portion 35.

The upper surface of the convex portion 35 is concave by the large diameter portion 252 of the rotary tool 250. On both sides of the recess there is an unbonded portion. The sensor of the friction stir welding device detects the groove 36 and moves the rotary tool 250 along the groove 36. For this reason, the positional relationship of the rotary tool 250 and a sensor at the time of joining the butt | matching part of the faceplates 12b and 22b can be utilized as it is. The relationship between the other rotary tool and the joint is as described above.

The shaft center of the rotary tool 250 is in a vertical line passing through or near the top of the truss by the two ribs 13A, 13B; 23A, 23B. The eccentricity corresponds to an increase in the plate thickness of the ribs 13A, 13B; 23A, 23B, an arc shape connecting the ribs and the face plate, the thickness of the connecting portion, and the like.

The joining of the connection member 30 performs the joining of the face plate 11, and then joins the face plate 21. By using two rotary tools, both ends of the connecting member 30 can be joined at the same time.

According to this, the junction of the connection member 30 is an overlap junction, and is not butt junction. For this reason, the connection member 30 can be joined even if the clearance gap between the two hollow members 10 and 20 changes due to the manufacturing tolerances of the two hollow members 10 and 20 and the tolerance of the arrangement interval of the two hollow members. will be. In particular, when a large number of hollow members are lined up and joined at once, the error becomes large. In this case, since it is an overlap joint, it can join easily.

In addition, since the connecting member 30 is bonded to the face plates 11 and 21 so as to be bonded to each other, the curved portions on the face plate side of the mold members 10 and 20 are eliminated, and stress concentration is eliminated.

Moreover, joining of both surfaces of a hollow shape member can be performed from one surface side. For this reason, it is not necessary to reverse the structure which joined one side. Therefore, it can be manufactured inexpensively and with high precision.

Moreover, the outer surface of the junction part of the face plates 12b and 22b can be joined flatly. The convex portions 16, 26, and 35 are not in the place (outer side, outside of the car) where a smooth surface is required in the structure or inside the car. In addition, there is no concave portion formed by the rotary tool on the outside of the vehicle. For this reason, cutting of a convex part etc. becomes unnecessary, and a vehicle body can be manufactured at low cost.

Moreover, the insertion force at the time of joining of the connection member 30 is supported by the two ribs 13A, 13B; 23A, 23B arrange | positioned toward the axial center of the rotary tool 250. As shown in FIG. For this reason, the bending of the ribs 13A, 13B; 23A, 23B can be suppressed. The board thickness of 13A, 13B, 23A, 23B can be made thin, and it can be made light. Of course, the bending of the face plates 11, 21, 30 can also be suppressed.

Since the bed 240 supporting the ribs 13A, 13B; 23A, 23B is at the same height, bending of the face plates 12, 22 can also be prevented.

Moreover, considering the case where it is used as a structure after joining, it becomes what comprised substantially all the truss structure. The joints of the hollow members 10 and 20 are also truss structures. For this reason, the bending rigidity out of surface improves and it can be made light.

Further, since the connecting members 30, the face plates 12b and 22b between the ribs 13A and 23A, and the ribs 13A and 23A substantially constitute a truss, this part is not particularly weak. However, the plate thickness should be examined.

Further, the inclination angle θ1 of the ribs 13A and 23A can be made larger than the inclination angle θ2 of the ribs 13B and 23B. According to this, the width | variety of the connection member 30 becomes large, and the board thickness needs to be thickened, and weight becomes large. However, it can be used where a large opening is required for the insertion of the friction stir welding device.

The inclination angles θ1 and θ2 of the ribs can be made the same so as to be an isosceles triangle. According to this, the plate | board thickness of rib 13A, 13B, 23A, 23B can be made the same. Moreover, the plate | board thickness of rib 13A, 23A can be made thinner than the case of FIG. However, when the size of the truss of this isosceles triangle is made the same as the size of the truss of other places, the width of the connecting member 30 is increased.

However, if the inclination angles θ1 and θ2 of the two ribs 13A, 13B; 23A, 23B are the inclination angles θ1 of Fig. 1, the trusses at the ends can be made into small isosceles triangles. The size of the base of the truss at this end is smaller than the size of the bottom of the truss at other points. According to this, the distance from the intersection of the ribs 13B and 23B and the face plates 12 and 22 to the ends of the hollow members 10 and 20 can be made small. Therefore, the width of the connection member 30 can be the same as the width of the connection member 30 of FIG.

The pitch of all trusses is the same, including part of the connecting member 30. Except for the trusses at the ends, the size of the trusses is the same. For this reason, the design of a hollow shape member can be standardized. The vertices by the two ribs 13A, 13B; 23A, 23B may be located outside the face plates 21, 31. The rotary tool 250 may be inserted at an angle toward the middle of the angle formed by the two ribs 13A, 13B; 23A, 23B. The axis in this case is directed to the top of the truss.

In the above embodiment, the connecting member 30 is joined by friction stir welding, but may be used in combination with arc welding. Since the friction stir welding is an overlapping joint, the joint strength is weak compared to the butt joint. For this reason, the arc welding part of the edge part of the connection member 30 and the face plates 21 and 31 is arc-welded. The arc welding point is an area of weak strength, for example. Moreover, arc welding can be used for repair.

In the above embodiment, both ends of the connecting member 30 are joined by friction stir welding, but one end may be friction stir welded, and the other end may be joined by arc welding. Since the arc welding side has a large distortion, friction stir welding is performed first.

The above embodiment corresponds to the case where the face plates 11, 12; 21, 22 are parallel, but one face plate is inclined with respect to the other face plate. In the plate | board thickness of rib 13A, 13B; 23A, 23B, the plate | board thickness of the side plate 11, 21 side is made thicker than the side plate 12, 22 side. The thickening of the side plates 11 and 21 is because the temperature tends to be high at the time of joining.

Although the face plate of a junction part was horizontal in the said Example, it can join similarly even if the normal of the face plate of a junction part is inclined. This is likely to occur at the junction of the end of the side structure 201. In this case, the axis of the rotating body follows the normal of the face plate.

The groove 36 can be changed into a convex portion.

The embodiment of FIG. 5 will be described. The convex portions 37 and 37 of the connecting member 30 are removed and a triangular convex portion 28 is provided on the upper surface of the face plate 21. The face plate 11 also has a convex portion. The interval of the pair of convex parts 28 is larger than the width of the connection member 30. According to this, the distance between the ends of the convex part 28 and the connection member 30 can be easily confirmed by visually seeing, and it is easy for the connection member 30 to overlap with the face plates 11 and 21 at a predetermined position. You can check.

The embodiment of FIG. 6 will be described. A convex portion 29 is provided on the upper surface of the face plates 21 and 11 at the position where the rotary tool 250 is inserted (near the intersection of the two ribs 23A and 23B). There is a concave portion 39 into which the convex portion 29 enters. The width of the concave portion 39 is sufficiently larger than the width of the convex portion 29 in consideration of the tolerance of the interval between the pair of convex portions 29. The width of the recess 39 is smaller than the diameter of the small diameter portion 251 of the rotary tool 250. The rotary tool 250 is inserted until the lower end of the small diameter portion 251 is lower than the base of the convex portion 29 (below the upper surface of the face plate 21). The width of the concave portion 39 and the convex portion 29 is smaller than the width of the convex portion 35. According to this, the space between the recessed part 39 and the convex part 29 is filled with the material of the convex part 35 as a supplementary source. The space is filled up because the material of the convex portion is pressed downward by the large diameter portion 252 of the rotary tool 250. The material of the convex part 30 is not limited to moving to the said space.

When joining the connection member 30 and the hollow shape member 20 by friction stir welding, it makes contact so that a clearance may not arise between them. However, there is a space between the concave portion 39 and the convex portion 29 to absorb the manufacturing tolerances. If friction stir welding is carried out with this space present, the material to be replenished is likely to be insufficient. Therefore, defects are likely to occur inside or outside the joint.

Therefore, after filling the space between the concave portion 39 and the convex portion 29 with powder or fibrous supplementary materials, friction stir welding is performed. This material is made of the same material or the same material as the connection member 30 or the hollow member 20. Since the powdery or fibrous material is easily deformed, the space can be filled by absorbing a tolerance regardless of the positional relationship between the concave portion 39 and the convex portion 29. A concave portion may be provided on the upper surface of the face plate 31, and a convex portion that enters the concave portion may be provided on the lower surface of the connecting member 30. In this case, the thickness of the junction part on the hollow member 20 side becomes thick.

The embodiment of FIG. 7 will be described. The rib 13C at the end of the hollow member 10C is orthogonal to the face plates 11C and 12C (following the normal of the face plate). Within the range of the plate thickness of the rib 13C, there is a rotary shaft center of the rotary tool 250, a groove 36, a recess 39, and a convex portion 19. The convex portion 19 corresponds to the convex portion 29. In this case, the insertion force at the time of friction stir welding is supported by the rib. 17Cb is a protrusion piece on which the connecting member 30 is placed. The rib at the end of the other hollow shape member can be likewise performed.

Although the convex portion 37, the convex portion 28, the concave portion 39, and the convex portion 29 have been described as a means of alignment, this can not be used only for friction stir welding of hollow members, but overlapping members. It can be used for joining.

The technical scope of the present invention is not limited to the words described in the claims of the claims or the means for solving the problems, but also to the range that can be easily replaced by those skilled in the art.

According to the present invention, the hollow member can be joined from one side without being limited in the dimensional accuracy of the hollow member, and the joint can be made high in strength.

In addition, positioning in the friction stir welding can be facilitated.

Claims (14)

Two face plates are connected between two face plates with a plurality of ribs, and an end portion of one face plate is provided with two hollow profile members which protrude from an end portion of the other face plate, and each of the face plates on the outer surface of the hollow shape member is substantially Flat, The protruding face plates are joined by friction stir welding from the other face plate side, Next, one connecting plate substantially parallel to the protruding one face plate is overlapped at the end of each of the other face plates of the hollow member, and is provided on the connecting member or the other face plate at the time of overlapping. The convex part determines the position of the connecting member with respect to the hollow member, and performs friction stir welding of the overlapped portion from the outside of the hollow member. The method of claim 1, There is a recess in the surface of the connecting member which overlaps the other face plate, and the convex portion provided on the other surface is inserted into the recess, A friction stir welding method for a structure comprising performing friction stir welding of a portion inserted by the friction stir welding. Two hollow shape members are joined Each of the hollow shaped members is connected between two face plates with a plurality of ribs, the end of one face plate protrudes from the end of the other face plate, The protruding face plates are friction stir welded, One connecting plate substantially parallel to the one protruding face plate overlaps with the end of each of the other face plate of the hollow member, and the overlapped portion is friction stir welded, And a convex portion on an outer surface of the other face plate along an end portion of the connecting member. Two hollow shape members are joined Each of the hollow members is connected between two face plates with a plurality of ribs, and one end of the face plate protrudes from the other end of the face plate. The protruding face plates are friction stir welded, One connecting plate substantially parallel to the one protruding face plate overlaps the end of each of the other face plates of the hollow member, and the overlapping portion is friction stir welded, And a convex portion protruding from a surface of the connecting member facing the protruding face plate, wherein the convex portion is proximate to the other face plate. The end of the first member overlaps with the end of the second member, and when the overlap is overlapped, the position of the first member relative to the second member is determined by the convex portion provided on the first member or the second member, Friction stir welding method of the structure, characterized in that for performing the friction stir welding the overlapped portion. The method of claim 5, There is a recessed portion in the overlapping surface of the first member, and a convex portion provided on the overlapping surface of the second member is inserted into the recessed portion, Friction stir welding method of a structure, characterized in that the friction stir welding the inserted portion by the friction stir welding. The method of claim 6, A friction stir welding method for constructing a structure wherein a powdered or fibrous material is disposed between the concave portion and the convex portion to perform the friction stir welding. The method of claim 6, The friction stir welding method of the structure, characterized in that the friction stir welding is performed from the first member side. The surface where the two members overlap is friction stir welded, And a convex portion on an outer surface of the other face plate along an end portion of the connecting member. I connect two faceplates with plural ribs, The end of one face plate is near the rib at the end of the hollow member, The end of the other face plate protrudes from the end of the one face plate, An extruded shape member for friction stir welding, characterized in that a convex portion is provided along an end of the face plate on an outer surface of the face plate. The method of claim 10, As for the said rib of the edge part and the rib adjacent to this, the said one faceplate is connected to the substantially one point, And said convex portion is substantially on the outer surface of said one point. The method of claim 10, The rib at the end is substantially orthogonal to the one face plate, And said convex portion is within the range of the plate thickness of the rib of said end portion. An extruded shape member for friction stir welding, characterized in that a first convex portion is provided on one side at both ends of the plate, and a second convex portion having a width smaller than the first convex portion is provided on the side opposite to the first convex portion. At both ends of the plate there is a convex on one side, An extruded shape member for friction stir welding, characterized in that a concave portion is provided on an opposite side to the first convex portion, and the width of the concave portion is smaller than the width of the convex portion.