JP2000061661A - Method for frictional-stirring joining - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent development of a recessed part on a joining part by thrusting a small diametered part of a rotating body having the small diametered part on a top end of a large diametered part into a butt part and then making the rotating body rotate and shift along the butt part on a condition that a border surface between the large diametered part and the small diametered part is positioned between an extension of a surface of a first member excluding a projecting part and a top surface of the projecting part. SOLUTION: A small diametered part 72 is thrusted into a joining part of a hollow plate- frame work 50, 60 while two joining rotating bodies 70, 70 are being rotated, and at the same time are horizontally shifted in the longitudinal direction of the joining part. The upper side rotating body 70 is positioned so that a boundary surface 73 between a large diametered part 71 and a small diametered part 72 may be positioned at a level 73a a little upper than the upper surface of non-projecting plates 52, 62. The lower rotating body 70 is positioned so that the boundary surface 73 between the large diameter d part 71 and the small diametered part 72 may be positioned within the projecting thick part 56, 66 a little lower than the lower surface of the non-projecting plates 51, 61. Even when a recessed part is generated in the outer side of the jointed part, there are thick parts on both the sides of the recessed part and the bottom surface of the recess is on the side outer than the outer surface of plates 51, 61, so that removal of surplus part in the upper surface of the joined part will cause the same surface as the plates 51, 61 and get rid of the recessed part.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to friction stir welding used for joining, for example, aluminum alloy materials. [0002] In a friction stir welding method, a round bar (referred to as a rotating body) inserted into a joint is moved along a joining line while rotating, so that the joint is heated, softened, and plastically fluidized. ,
This is a solid-phase bonding method. The rotating body is composed of a small-diameter portion inserted into the joint and a large-diameter portion located outside. The small diameter part and the large diameter part are coaxial. Rotate the large diameter side. The joining by the friction stir welding method is applied to the butted portion and the overlapped portion. This is disclosed in Japanese Unexamined Patent Publication No. 7-505090 (EP 06).
15480B1), Welding & Metal Fabrication, Janu
ary 1995 on pages 13-16. [0003] The material of the material to be joined is disclosed in the above-mentioned Japanese Patent Publication No. 7-505090. Material to be joined,
Regarding the material, dimensions, rotation speed and moving speed of the rotating body,
Summary of the National Meeting of the Japan Welding Society Vol.56 ('95 -4) 2
It is shown on pages 08 to 209. According to various experiments of the friction stir welding method, some of the members on the upper surface of the joint between the two members are cut like a facet by the rotation of the large diameter portion of the rotating body. It is skipped and a dent is formed on the upper surface of the joint. On both sides of the recess, swelling occurs due to plastic deformation of the member. [0005] The swelling may be removed, but repair of the dent requires putty and the like, which is expensive. Further, if there is a gap between the end surfaces of the butted portions of the two members before joining, defects such as dents occur in the joined portions. For this reason, the strength is reduced, which is a problem particularly in a large structure. As the size of the member increases, it becomes difficult to manage the gap, the dent increases, and a defect is more likely to occur. If the presence of the dent does not matter because the joint is covered with another member, there is no problem except for the strength. However, dents must be removed from the viewpoint of appearance on the side surface of the vehicle body or the like. In addition, even when it is not visible, the dent may cause a problem in performance. An object of the present invention is to prevent the occurrence of a dent at a joint. The above object can be attained by providing a projecting portion projecting toward the rotating body on an object to be joined. The small diameter part at the tip of the large diameter part of the rotating body enters the thick part including the protruding part, and the large diameter part is located in the thick part between the extension of the non-projecting part and the top of the protruding part. FIG. 1 to FIG. 5 show an embodiment of the present invention.
In the following, application to a vehicle body of a railway vehicle will be described. In FIG. 5, the vehicle body of the railway vehicle includes a side structure 41, a roof structure 42, a floor structure 43, and a wife structure 44 at an end in the longitudinal direction. The side structure 41 has a hollow extruded profile (50, 6).
0) are arranged in parallel and joined.
Joining is performed as shown in FIG. Roof structure 42, floor structure 4
3 is similarly configured. The connection between the side structure 41 and the roof structure 42 and the connection between the side structure 41 and the floor structure 43 are performed by MIG welding or the like. FIG. 1 shows a joint portion (joining portion) of a hollow material constituting the side structure 41. Hollow members 50 and 60
Is an extruded aluminum alloy. Hollow shape material 5
Numerals 0 and 60 are composed of two plates 51, 52, 61 and 62 and diagonal plates (ribs) 53 and 63 connecting them. There are a plurality of oblique plates 53 and 63, respectively, which are arranged in a truss shape. The directions of inclination of the plates 53 and 63 are alternate. The end of one (first) hollow mold 50 is inserted into the end of the other (second) hollow mold 60. Near the end of the hollow section 50 is a vertical plate 54 joining the plates 51 and 52 together. Reference numeral 55 denotes a projecting piece that supports the end of the hollow mold member 60. On the extension of the center of the plate 54 in the thickness direction (the left-right direction in FIG. 1), the ends of the thick portions (projections) 56, 66 for joining the two hollow members 50, 60 (ie, the ends). , End portions of the butted portions of the hollow members 50 and 60 (joint portions W
Center)) is located. Plates 51, 5 near joint W
2, 61, 62 project from the front side (the outer side in the thickness direction of the hollow mold member, the side on which the joining operation is performed, that is, the rotating body 70 side of the joining tool) at a predetermined width and a predetermined height, and have a thickness. It is a meat part. Thus, the thick portions 56 and 66 are composed of the protruding portions and other portions. The size of the thick portions 56 and 66 is determined by the size of the rotating body 70 and the gap between the two hollow mold members 50 and 60, as described later. Thick portions 56, 66 are at each end of plates 51, 52, 61, 62. The front surface (outer surface) of the thick portions 56, 66 and the plate (non-projecting portion) 51,
The front surfaces (outer surfaces) of 52, 61, and 62 are smoothly connected and inclined. When the two thick portions 56 and 66 are abutted, the shape is trapezoidal. Note that the butting of the mold members 50 and 60 or the butting of the thick portions 56 and 66 means that the end portions 5 of the two mold members
6a and 66a are in contact with each other, and also when there is a gap between the ends 56a and 66a of the two mold members. Rotating bodies 70, 70, which are joining tools, are arranged above and below the joint of the hollow material. The rotating body 70 has a small-diameter round bar (small-diameter portion) 72 installed at the tip of a large-diameter round bar (large-diameter portion) 71 at the base. The large diameter portion 71 and the small diameter portion 72 are coaxial. Upper rotating body 70
Is located substantially vertically below the rotating body 70. The two rotating bodies 70, 70 may be separated from each other along the joining line, but it is better not to be largely separated in order to prevent the bending of the hollow mold members 50, 60. The rotating body 70 is a material harder than the hollow mold members 50 and 60. While rotating the two rotating bodies 70, 70, the small-diameter portion 72 is inserted into the joint between the hollow members 50, 60. Then, the two hollow mold members 50 and 60 are moved in the horizontal direction along the longitudinal direction of the joint. Two rotating bodies 7
0 and 70 are moved simultaneously. At the time of friction stir welding, the upper rotating body 7
0, the boundary (substantially flat) 73 between the large-diameter portion 71 and the small-diameter portion 72 is connected to the plate 5 of the general portion (non-projecting portion).
It should be located slightly above (inside the protruding portions of the thick portions 56, 66) 73a the upper surface (the outer surface in the thickness direction of the hollow mold members 50, 60) of the first and first members 61. Lower rotating body 70
In (2), the boundary 73 between the large diameter portion 71 and the small diameter portion 72 is slightly lower (thick wall) than the lower surface (outer surface in the thickness direction of the hollow mold material) of the plates 51, 61 of the general portion (non-projecting portion). Part 5
6, 66). That is,
The boundary 73 between the upper and lower rotating bodies 70, 70 is the non-projecting plate 51,
61 (thick portions 56 and 66)
At the top of the thick portions 56 and 66. The line 73a in FIG. As described above, the small-diameter portion 72 is located at the abutting portion, and the boundary 73 between the large-diameter portion 71 and the small-diameter portion 72 is the extension of the outer surface of the plates 51 and 61 except for the thick portions 56 and 66 and the thickness. Meat part 56, 66
It is located between the top of During the joining operation, the mold members 50 and 60 are placed on a gantry and fixed. There is no mount around the thick part on the lower surface. The center of rotation of the rotating body 70 is at the center of the joint, that is, at the center of the thickness of the plate 54. Referring to FIG. 4, the relationship between the sizes of the parts will be described. The width W1 of the top of the thick parts 56, 66 when the two thick parts 56, 66 are abutted is determined by the diameter d of the small diameter part 72. And is smaller than the diameter D of the large diameter portion 71. Two thick parts 5
The widths W2 of the bases 6 and 66 are larger than the diameter D of the large diameter portion 71. The height H1 of the protruding portions of the thick portions 56 and 66 is smaller than the small diameter portion 72.
Is greater than the length. The lower end of the large diameter portion 71 is the thick portion 56,
When located at the position 73 a of 66, the tip of the small diameter portion 72 reaches the protruding piece 55 or is located in the vicinity thereof. The top plates 51, 61 of the joints 56, 66 and the base plates 51, 6
The first side is connected to slopes 56c and 66c. FIG. 2 shows a state in which the friction stir welding has been completed. FIG. 2 shows the upper joint of FIG. The lower joint is symmetrical to the upper joint. A concave K is formed on the outer surface side of the joint W toward the inside of the hollow mold member.
There are thick portions 56T, 66T on both sides of the recess K. The thick portions 56T and 66T are the rest of the thick portions 56 and 66. The thick portions 56T and 66T include those that have been plastically deformed. The bottom surface of the recess K is located at a position 73a outside the outer surfaces of the plates 51 and 61 of the general portion. Assuming that the upper surface side in FIG. 1 is the outer surface side of the body of the railway car, an extra portion of the joint portion on the upper surface (the plate 51 of the general portion,
The upper side of the upper surface of 61 is cut with a grinder so as to be flush with the upper surfaces of the plates 51 and 61 of the general part. Since the upper surface is cut, the cutting operation is easy. Similarly, the recess K and the thick portions 56T, 66 are formed on the lower surface side.
Although there is T, if it is on the inner surface side of the vehicle body, it is covered with a decorative board, so no cutting is required. FIG. 3 shows a profile 50 placed on a gantry 111,
60 shows a state in which the thick parts 56T and 66T on the upper surface side are deleted while being mounted on the gantry 111. According to this, generation of the dent K can be substantially prevented. For this reason, overlay welding and repair with putty can be eliminated. In the above embodiment, the end portions 56a and 66a of the thick portions 56 and 66 are in contact with each other, but if there is a gap between them, the thick portion 56 fluidized by friction stir welding is used. , 66 are pushed into this gap. For this reason, even if there is a gap, no defect occurs at the joint. Specifically, the height of the thick portion (the plates 51, 52, 6
When the protrusion of the first and second projections 62 from the outer surface) is set to 1 mm, even if the gap is 1 mm, joining can be performed without defects. Further, the position of the recess K can be located outside from an extension of the outer surface of the plates 51, 52, 61, 62. That is, the occurrence of the dent can be substantially easily prevented. The width W2 of the base of the thick portions 56, 66 is larger than the diameter D of the large diameter portion 71. The width W1 of the tops of the thick portions 56 and 66 is larger than the diameter d of the small diameter portion 72. When the center of the rotating body 70 is deviated from the center of the thick portions 56, 56,
And the gap between the two mold members is determined. The tops and bases of the thick portions 56, 66 are connected by slopes 56c, 66c. That is, when the two thick portions 56 and 66 are abutted, they have a trapezoidal shape. For this reason, there is no extra portion in the hollow mold member as compared with the case where the thick portions 56 and 66 are projected in a square shape without the slopes 56c and 66c. For this reason, the material of the hollow mold member can be reduced, and the manufacturing cost can be reduced. In addition, the amount of cutting by the grinder can be reduced and can be easily performed. Thick part 5
6 and 66 are for replenishing the metal at the junction of the two mold members, and may be trapezoidal. In addition, as shown in FIG.
After slightly raising a and 61a, trapezoidal portions of the protruding portions 56 and 66 may be provided. The plate 54 prevents the thick portions 56, 66 from being bent inward by the compressive force of the rotating bodies 70, 70. In FIG. 1, the shape of the right end of the hollow mold 50 may be the shape of the left end or the shape of the right end of the hollow mold 60. The same applies to the hollow mold member 60. In short, it is only necessary that two mold members can be joined. The rotating body 70 moves by detecting the butted portion with an optical sensor. Slope 56c, 66 of thick portion 56, 66
By detecting c, the position of the rotating body 70 in the width direction is determined. FIG. 7 shows a configuration in which slopes 56n and 66n for sensing are provided at portions where two thick portions 56m and 66m face each other. The slopes 56n (66n) are thick portions 56m and 66m, respectively.
Or one of them. In each of the above embodiments, the end surfaces 56 of the two joints
Although a and 66a are parallel to the axis of the rotating body 70, the two end faces 56a and 66a may be inclined with respect to the axis of the rotating body 70. For example, the end surface 56a of one member 50 may be inclined, and the end surface 66a of the other member 60 may be overlapped with the upper surface. According to this, even if the interval between the two end surfaces is large, the metal fluidized by the rotation of the rotating body 70 can be prevented from flowing out from between the piece 55. This shape is suitable for connecting pipes. The joining device will be described with reference to FIG. The hollow members 50 and 60 are mounted on the gantry 111 and fixed by clamps 113. Two hollow profiles 50, 60
Have a predetermined gap. The butted portions of the two hollow members 50, 60 are appropriately temporarily welded. The upper rotating body 70 is suspended from a traveling body 121 traveling in the width direction. The traveling body 121 moves along the upper frame of the portal traveling body 122. The traveling body 122 travels along a rail 123 along the longitudinal direction on both sides of the hollow mold members 50 and 60. The lower rotating body 70 is installed on the traveling body 131 between the two mounts 111, 111. The traveling body 131 is mounted on the traveling body 132,
Move in the width direction. The traveling body 132 travels along the rail 133 along the longitudinal direction of the hollow members 50 and 60. Below the upper rotating body 70 is a lower rotating body 70. The traveling bodies 121 and 131 move the joining devices 70 and 70 up and down. The traveling members 121 and 131 have hollow members 50,
A plurality of rollers 124 and 134 for holding the roller 60 are provided. Rollers 124 and 134 are rotating bodies 70 and 70
And on both sides of the thick portions 56, 66 in front of the front. The rollers 124 and 134 are provided in a plurality of rows along the running direction as necessary. Rollers can be added before and after the rotator 70. Sensors (not shown) for detecting positions to be joined are installed on the traveling bodies 121 and 131. The traveling bodies 121 and 131 are moved in the width direction by the sensors. When a laser is used as the sensor, the slope 56c,
56c, 66c, and 66c are obtained, and the center of the parts to be joined is detected. After joining the upper and lower surfaces of the moldings 50 and 60 with the rotating bodies 70 and 70, the moldings 50 and 60 are
Is placed, and the thick part on the upper surface is cut to smooth finish. The cutting grinder work can be made smoother if done manually. For this reason, the thick part to be cut is preferably located on the upper surface. It is to be noted that the cutting operation can be shortened by first cutting the thick-walled portion with a machine and then cutting it manually. In this case, a cutting tool is installed on the traveling body 121 slightly behind the rotating body 70. Rotating body 70
When the tool rotates, the cutting tool also performs a cutting operation. For example, as shown in FIG. 9 and FIG. 10, the end mill 126 is installed on the traveling body 121 on the upper side behind the rotating body 70 on the upper side. The end mill 126 cuts the thick portions 56 and 66. The position of the lower end of the end mill 126 is slightly higher than the upper surfaces of the plates 51, 61 on the upper surfaces of the hollow mold members 50, 60. The diameter of the end mill 126 is sufficiently larger than the width of the thick portions 56 and 66 at the positions.
The rollers 124, 124 are pressed from above and below in the vicinity of the end mill 126 so that the amount of cutting by the end mill 126 is the same. In the above embodiment, the thick portions are provided at the ends of the pair of hollow members to be joined. However, as shown in FIG. The metal of the thick portion 66 moves to the gap between the hollow mold members 50 and 60 and the upper surface of the plate of the hollow mold member 50. Also, in one hollow mold member 60, the upper plate 61 has a thick portion,
In the other hollow mold member 50, the same applies to the case where the lower plate 61 has a thick portion. Although the case where the extruded mold material of the above embodiment is a hollow mold material has been described, the present invention can be applied to a solid extruded mold material. Examples will be described below. FIG. 12 shows a flat extruded shape 31, 32 having thick portions 34, 35 at its ends, respectively.
The example of the joint shape which joins and joins 4 and 35 is shown. At this time, a backing jig (stand) 36 is disposed on the extruded members 31 and 32. The backing jig 36 is made of a material that is harder than the extrusion members 31 and 32 in order to prevent joining with the joining portion W. The joint W shown in FIG. 13 is obtained by moving the rotating body 70 while rotating along the mating surface of the joint. Thick parts 34, 3
The condition of the rotating body 70 with respect to 5 is the same as that of the above embodiment. Next, as shown in FIG. 14, the dent K and the thick portion are removed smoothly using a grinder or the like. Roller 12 of joining device
4 and the like are the same as in the above embodiment. In the case of an extruded member having only one joint, a roller for supporting the extruded member can be arranged instead of the lower rotating body 70 in the embodiment of FIG. According to this, it is not necessary to support all surfaces of the mold members 31 and 32, and the structure of the gantry can be simplified. FIGS. 15 to 17 show that a plate has a plurality of ribs 39 on one surface and a thick portion 34 on a surface opposite to the rib 39.
This is a case where the extrusion members 37 and 38 having the b and 35b are friction stir welded. The gantry 36B places the lower end of the rib 39 and the lower surfaces of the thick portions 34 and 35 thereon. The friction stir welding is the same as in the above embodiment. The embodiment shown in FIGS. 18 to 19 shows the extruded members 37c, 3c having thick portions 34b, 35b on the rib 39 side.
8c. According to this, the gantry 36C side becomes flat. For this reason, when there may be some unevenness on the side opposite to the rib 39, the finishing process for smoothing can be omitted, and the manufacturing can be performed at low cost. The joining portion W becomes a good joining portion and can obtain a predetermined thickness. In the embodiment shown in FIGS. 18 to 19, when the shape members 37c, 38c are applied to the vehicle body, the thick portions 34b,
Since 35b is located inside the vehicle, cutting of the thick portions 34b and 35b can be omitted. However, an unjoined portion is likely to be formed on the vehicle outside of the joined portion, and it is necessary to fill the space between the end of the thick portion 34b and the end of the thick portion 35b with a putty and paint. However, in the embodiment of FIGS. 15 to 17, there is no unjoined portion on the outside of the vehicle, and there is no need for painting. In the embodiment shown in FIGS. 15 to 17, the ribs 3 are provided around the thick portions 34b and 35b.
Since there is no 9, it is easy to press with the roller 124. The embodiment shown in FIGS. 20 to 22 will be described. In FIG. 22, the side structure 416 of the railway vehicle is configured by combining a plurality of extrusion members 150 and 160. Extruded profiles 150, 15 between doorway 171 and window 172
0 and the extruded profile 1 between windows 172
The extrusion direction of each of 50 and 150 is the vertical direction in FIG. Extruded profile 160 at the bottom of window 172,
160, and the extruded profile 160 at the top of the window 172;
Each extrusion direction of 160 is the lateral direction in FIG. In other words, the extrusion direction of the extrusion 150 and the extrusion of the extrusion 160 are orthogonal to each other. The extruded mold members 150 having the same extrusion direction are joined together, and the extruded mold members 16 are joined together.
The joining portions of 0 and 160 are provided with a thick portion and joined as in the above embodiment. FIG. 21 shows a portion where the pushing direction is orthogonal. FIG. 21 is before friction stir welding. Extruded profiles 150, 160 have ribs 153, 16 on one side of the plate.
3 It is not a hollow material. Extruded profile 150, 1
Plate 1 near the tip of 60 ribs 153, 163, joint
51, 161 are mounted on the gantry 36B. Rib 153,
The 163 side is the inside of the vehicle, and the plates 151 and 161 are the outside of the vehicle. The end of the extrusion 150 protrudes toward the rib 153 to form a thick portion 153. The thick portion 153 further protrudes toward the extruded die 160 to be joined to form a protruding portion 157. The protrusion 157 overlaps the outer surface of the plate 161 of the extrusion 160. Stand 36B
The rib 163 in the vicinity of is no longer cut. The protrusion amount L2 (shown in FIG. 23) of the protrusion portion 157 is determined by the width L of the thick portion.
Same as 1. In other words, the protruding portion 157 is not
Is equivalent to The tip of the protruding portion 157 is inclined like the thick portion 156. When the rotary stirrer 70 is inserted from above to perform friction stir welding, the end portions 1 of the two extruded members 150 and 160
Since the protruding portion 157 is located above the portion 150c (shown in FIG. 23) between the portions 50b and 160b, metal such as the protruding portion 157 is supplied to the gap 150c. The metal is also supplied above the extrusion 160. Therefore, better bonding can be obtained than when there is no thick portion 156 and no protrusion 157, or when there is no protrusion only. Since the rib 153 of the extrusion 160 is cut out and overlaps the projection, the plate 161 near the projection 157 can be pressed (supported), and good joining can be achieved. FIG. 23 shows the thick part 156 and the protruding part 1.
57 is provided on the rib 153 side. Board 151, 1
61 is mounted on the gantry 36C. The rib 163 near the end 160b is notched. The thick portion 156 and the protruding portion 157 of the extrusion 160 are located on the rib 153 side (the inner side of the vehicle). There is a triangular groove 158 on the outer surface of the thick portion 156 at a position corresponding to between the end 150b of the extrusion 150 and the end 160b of the extrusion 160. This is a position mark when the position of the rotating body 70 is determined first. It also serves as a sensor mark. In the case of an extruded profile in which the extrusion directions are orthogonal to each other, it is possible to use only the thick portion 156. Providing a protruding portion toward an adjacent member can also be applied to a hollow mold member or the like. Further, the present invention can be applied to a case where two extruded members are not orthogonal to each other, that is, between two parallel members. The present invention can be applied to joining of known honeycomb panels. The honeycomb panel has two face plates, a honeycomb-shaped core material between the two face plates, and an edge material disposed around the core material,
Consists of The object to be joined can be applied to a pipe or the like. In this case, the terms of the plate and the like in the above-mentioned embodiment are appropriately read as cylinders. The technical scope of the present invention is not limited to the language described in the claims or the language described in the section for solving the problems, and is easily replaced by those skilled in the art. It extends to a wide range. According to the present invention, the joining can be carried out by substantially eliminating the dent at the joining portion. In addition, even when the gap between the joints is large, the joint can be substantially removed by removing the dent of the joint.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a joint according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view after friction stir welding in FIG. FIG. 3 is a longitudinal sectional view showing a state where finishing processing is performed after friction stir welding in FIG. FIG. 4 is a diagram illustrating the size of each part. FIG. 5 is a perspective view of a vehicle body of a railway vehicle. FIG. 6 is a longitudinal sectional view of a main part of a joint according to another embodiment of the present invention. FIG. 7 is a longitudinal sectional view of a main part of a joint according to another embodiment of the present invention. FIG. 8 is a longitudinal sectional view of a joining device according to one embodiment of the present invention. FIG. 9 is a side view of a main part of the joining device of FIG. 8; FIG. 10 is a left side view of FIG. 9; FIG. 11 is a longitudinal sectional view of a joint according to another embodiment of the present invention. FIG. 12 is a longitudinal sectional view of a joint according to another embodiment of the present invention. FIG. 13 is a longitudinal sectional view after friction stir welding in FIG. FIG. 14 is a longitudinal sectional view of FIG. 12 after a thick portion is finished to be smooth. FIG. 15 is a longitudinal sectional view of a joint according to another embodiment of the present invention. FIG. 16 is a longitudinal sectional view after the friction stir welding in FIG. FIG. 17 is a longitudinal sectional view of FIG. 13 after finishing a thick part smoothly. FIG. 18 is a longitudinal sectional view of a joint according to another embodiment of the present invention. FIG. 19 is a longitudinal sectional view after friction stir welding in FIG. 18. FIG. 20 is a right side view of FIG. 21. 21 is a longitudinal sectional view of a joint according to another embodiment of the present invention, and is a sectional view taken along line 21-21 of FIG. 22. FIG. 22 is a front view of a side structure of the railway vehicle. FIG. 23 is a longitudinal sectional view of a joint according to another embodiment of the present invention. [Explanation of Signs] 31, 32, 37, 37c, 38, 38c: Form member, 3
6, 36B, 36C: gantry, 39: rib, 70: rotating body for joining, 71: large diameter part, 72: small diameter part, 50, 60:
Hollow mold material, 51, 52, 53, 54, 61, 62, 6
3: plate, 56, 66: thick portion, 56c, 66c: slope,
111: stand, 150, 160: extruded material, 151,
161: plate, 153, 163: rib, 156: thick part
157: Projection.

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Yasuo Ishimaru             794 Kudamatsu City, Yamaguchi Prefecture             Inside the Kasado Plant of Hitachi, Ltd. (72) Inventor Hisanobu Okamura             Hitachi, Ibaraki Pref.             Hitachi, Ltd., Hitachi Laboratory (72) Inventor Kinya Aota             Hitachi, Ibaraki Pref.             Hitachi, Ltd., Hitachi Laboratory F term (reference) 4E067 AA05 BG02 DA04 DA13 EA07                       EA08 EA10 EC01

Claims (1)

Claims: 1. An end of a first member and an end of a second member are abutted, and the end of the first member is on one side along the abutting portion. And the end of the second member abuts at least the end of the first member except for the protrusion, and the end of the large diameter portion An extension of the surface of the first member in a portion excluding the protrusion and the protrusion, wherein the small-diameter portion of the rotating body having the small-diameter portion is inserted into the butting portion including the protrusion; In the state where the boundary between the large-diameter portion and the small-diameter portion is located between the tops of the portions, the rotary body is relatively moved along the butting portion while rotating the rotating body. Friction stir welding method.