JP2003326373A - Joined body of plurality of linear members with friction- stirring and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform a good friction-stirring joining by preventing the enlarging of a gap caused by thermal-strain (thermal-deformation) with the friction-stirring joining when a plurality of members are subjected to the friction-stirring joining. <P>SOLUTION: The plurality of members are butted along a member joining line and fixed with a width directional deformation preventive means arranged to the next positional member 33 facing a longitudinal wall positioned at the opposite side of a present joining line L1 of the present positional member 32 or the member following to the next member across the next member, and then, the member 31 and the member 32 are subjected to the friction-stirring joining in the longitudinal direction along the present joining line. In this way, the thermal deformation caused by the adjacent member 32 due to the friction- stirring joining, is prevented. For example, the next positional members facing the longitudinal wall positioned at the opposite side to the present joining line of the present positional member are subjected to tack welding each other at a prescribed interval in parallel with the friction-stirring joining, to function as the width directional deformation preventive means. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joined body in which a plurality of members (plates or mold members extending in the longitudinal direction) are friction stir welded and a method for manufacturing the joined body, and particularly to large-sized vehicles such as railway cars, ships, and aircraft. The present invention relates to a friction stir welded body used for a structure and a method for manufacturing the same.

[0002]

2. Description of the Related Art Generally, a two-sided structure (panel) such as a long hollow member that extends in the longitudinal direction is used for a large structure such as a railroad vehicle, a ship, and an aircraft. It is configured by butt-joining the ones arranged in, and when joining such extrusion mold members,
For example, the butt joint is formed by fusion welding using MIG welding or the like. However, problems such as heat distortion occur in the method of joining by fusion welding.

On the other hand, Japanese Patent Publication No. 7-505090 discloses the joining of members by friction stir welding, in which a rotary tool made of a material substantially harder than the work is used to weld the work. There is a joining method in which the work pieces are joined by plastic flow due to frictional heat generated between the rotary tool and the work piece by inserting the work piece into the work piece and moving the rotary tool while rotating the work piece.

When a plurality of hollow mold members, which are members, are friction stir welded, first, as shown in FIG. 5A, the hollow mold members 11 and 12 that are members are formed along their long sides (longitudinal joining lines).
Match along. Then, along this abutting portion, the tool (rotating tool) is moved while being rotated, and the hollow mold members 11 and 12 are friction stir welded to obtain a joined body 13. As described above, the hollow mold member 11 is formed by friction stir welding.
In the joined body 13 in which Nos. 12 and 12 are friction stir welded, thermal strain is unavoidably generated due to frictional heat generated at the time of welding. In addition to the bonded body 13 as described above, the hollow mold member 1 is further added.
When 4 is joined, as shown in FIG. 5B, due to the thermal strain of the joined body 13, a gap G between the hollow mold member 14 and the joined body 13 is generated, and this gap G Due to the existence, it may be extremely difficult to perform friction stir welding between the hollow mold member 14 and the joined body 13.

On the other hand, even when a plurality of members are fixed by friction stir welding with the members fixed to the surface plate, it is often impossible to perform the friction stir welding of the plurality of members due to the above-mentioned thermal strain. . For example, as shown in FIG. 6, plates (long plates) 21 and 22 extending in the longitudinal direction are butted against each other along a joining line in the longitudinal direction and fixed to a surface plate at both ends in the longitudinal direction.
Then, when friction stir welding is performed along the longitudinal joining line to form the joining plate material 23, since the long plates 21 and 22 are fixed at both ends in the longitudinal direction, friction heat and the like at the time of friction stir welding can be applied. Due to the resulting thermal strain, the bonding plate member 23 is distorted in a state in which the vicinity of the central portion thereof is most curved. When the long plate 24 is further joined to such a joining plate member 23, the gap G between the long plate 24 and the joining plate member 23 is caused by the butt joining line due to the thermal strain of the joining plate member 23. It became extremely large near the center,
The presence of this gap G may make it extremely difficult to perform friction stir welding between the long plate 24 and the joining plate member 23. This can be said when the hollow mold member, which is a member, is fixed to the surface plate and friction stir welding is performed.

As described above, when friction stir welding is performed on a plurality of members, the gap may be increased due to thermal strain due to the friction stir welding, and the plurality of members may not be friction stir welded.

By the way, in Japanese Unexamined Patent Application Publication No. 2002-1551 (hereinafter referred to as “conventional example 1”), in order to prevent the opening when continuously performing friction stir welding, the starting point from the end point side when performing friction stir welding is described. It is described that temporary attachment (temporary attachment by friction stir welding) is performed toward the side. Thus, by making the start point and the end point of the temporary attachment opposite to the start point and the end point of the continuous friction stir welding, the expansion direction of the groove by the continuous friction stir welding becomes opposite to the expansion direction by the temporary attachment. The expansion of the groove is suppressed during continuous friction stir welding.

Further, in Japanese Patent Laid-Open No. 2000-233284 (hereinafter referred to as Conventional Example 2), when performing friction stir welding,
It is described that temporary tacking is performed in advance. That is, during friction stir welding, a large force is applied to the members to be joined,
In order to prevent the groove size of the butt portion from increasing due to this, friction stir welding is performed after temporary attachment. Then, in Conventional Example 2, in order to prevent the temporary joining mark from being seen, the mold members having the protruding portions at the ends are butted against each other, and the protruding portions are temporarily friction stir welded with a rotary tool having a small insertion margin. Next, perform main joining with a rotating tool with a large insertion allowance,
The protrusion is removed so that the temporary joining mark cannot be seen.

Further, in Japanese Patent Application Laid-Open No. 2002-35966 (hereinafter referred to as Conventional Example 3), when a plurality of rows of joining lines are simultaneously friction stir welded, a portion such as a window which does not require friction stir welding is mixed. The friction stir welding method is described.

[0010]

In the above-mentioned conventional example 1,
Although temporary attachment is performed before friction stir welding to prevent the expansion of the groove during continuous friction stir welding, in Conventional Example 1, when heat stir welding of a plurality of rows is performed, friction heat, etc. There is no description about the fact that the friction stir welding of a plurality of rows cannot be performed due to the expansion of the gap due to the thermal strain caused by the above. In the conventional example 1, it is possible to prevent the expansion of the groove when performing the single row friction stir welding Can only be done. That is, in the method described in Conventional Example 1, when performing friction stir welding of a plurality of rows, it is possible to prevent the gap from widening due to thermal strain caused by friction heat or the like, and to perform the friction stir welding of a plurality of rows well. There is a problem that you cannot do it.

Further, in the conventional example 2, it is only described that the temporary attachment mark is made invisible. In the method described in the conventional example 2, friction heat or the like is generated when friction stir welding of a plurality of rows is performed. There is a problem that the gap cannot be expanded satisfactorily due to the thermal strain caused by the above and the friction stir welding of a plurality of rows cannot be performed well.

Further, although the conventional example 3 describes that a plurality of rows of joining lines are simultaneously friction stir welded, here, when a portion such as a window that does not require friction stir welding is mixed, a plurality of rows are joined. Only the control method of the rotary tool in the case of simultaneously performing the friction stir welding of the welding lines of No. 3 is described, and in Conventional Example 3 also, when performing friction stir welding of a plurality of rows, thermal strain caused by friction heat or the like is caused. There is a problem that it is not possible to satisfactorily perform friction stir welding of a plurality of rows by preventing the gap from expanding due to.

As described above, conventionally, when a plurality of members are friction stir welded, there is a problem that the gap becomes large due to thermal strain due to the friction stir welding, and the plurality of members cannot be friction stir welded.

An object of the present invention is to provide a joined body in which a plurality of members are satisfactorily friction stir welded and a method for producing the same, by preventing the gap from widening due to thermal strain (thermal deformation) due to the friction stir welding. To do.

[0015]

According to the present invention, a plurality of long plates and molds (hereinafter referred to as members) extending in parallel are formed by friction stir welding using a tool having one or more shoulder surfaces. When a plurality of members are abutted along a member joining line in a wide joined body to be joined, and the adjacent preceding member and present member are friction stir welded in the longitudinal direction along the present joining line At least one of fitting or fixing means provided on the next-order member facing the longitudinal wall located on the opposite side of the current joining line of the current-order member or sandwiching the next-order member. A plurality of means for friction stir welding, which are fixed or sandwiched by means for preventing deformation in the width direction, and are provided with means for preventing thermal deformation between adjacent members next to each other caused by friction stir welding in the longitudinal direction. A joined body of row members is obtained.

According to this invention, the next-order member facing the longitudinal wall positioned on the opposite side of the current joining line of the current-order member or the next-order member is sandwiched between the next-order members. At least one widthwise deformation preventing means of the fitting or fixing means is fixed or sandwiched to prevent thermal deformation between adjacent members next to each other caused by friction stir welding in the longitudinal direction. A gap due to thermal deformation due to stirring and welding can be prevented, and a plurality of members can be satisfactorily frictionally stir welded.

In the present invention, the width direction deformation preventing means is
For example, temporary joining welding is performed at a predetermined interval in parallel with the friction stir welding of the next member facing the longitudinal wall located on the opposite side of the current joining line of the current member.

In this way, as the width direction deformation preventing means,
Since the next member facing the longitudinal wall located on the opposite side of the current joining line of the current member is tack welded at a predetermined interval in parallel with the friction stir welding, the tack welding is performed. Welding and friction stir welding can proceed at the same time, and as a result, a plurality of members can be satisfactorily friction stir welded in a short time.

In the present invention, the thin plate material which is plasticized by the friction stir welding is interposed at the tack welding positions performed at the predetermined intervals. As a result, not only the dent due to tack welding can be prevented, but also the tack welding trace can be made invisible.

In the present invention, the thin plate material is a thin plate end plate existing only at the temporary joining position. As described above, by providing the thin plate end plate only at the temporary joining position, not only the dent due to the temporary welding can be prevented but also the temporary welding trace can be made invisible.

In the present invention, when the member is a long plate and the tool is a bobbin tool in which shoulder surfaces are located on both front and back surfaces of the current joining line, the friction stir welding is performed in parallel. This is a width direction deformation preventing means in which temporary welding is performed on both front and back surfaces at predetermined intervals.

As described above, when the member is a long plate and the friction stir welding is performed using the bobbin tool, the long plate is not deformed by the pressing force, and in parallel with the friction stir welding. Since the temporary welding is performed on both the front and back sides at the predetermined intervals, it is possible to reliably prevent thermal deformation during friction stir welding.

In the present invention, the widthwise deformation preventing means is
On the vertical cross section of the joining line or on both sides of the joining line, the preceding and present members, and the adjacent next member that is formed by friction stir welding in the longitudinal direction connecting the present and next members. It is constituted by fitting means for preventing thermal deformation between the two.

By using such fitting means, the members can be easily fitted together, and moreover, thermal deformation during friction stir welding can be easily prevented.

In the present invention, the member is a hollow member such as a double skin, and the fitting means is a fitting means located on both sides of the member diagonally across the joining line. By using such a fitting means, it is possible to easily prevent the member from being deformed in the width direction due to the sandwiching.

In the present invention, when the member is a hollow member such as a double skin, and the tool is a tool in which the shoulder surfaces are located only on the front and both surfaces of the current joining line, the adjacent members are fitted together. The means is a fitting means alternately provided on the diagonal with the hollow portion of the hollow mold member sandwiched therebetween. If such a fitting means is used, it is possible to prevent the member from being deformed in the width direction by being clamped on one side.

In the present invention, in the case of a joining line having no fitting means on the joining line vertical line, at least both ends in the longitudinal direction are temporarily fixed. By temporarily fixing both ends in the longitudinal direction in this manner, it is possible to prevent the member from being deformed in the width direction.

In the present invention, a thin plate material which is plastically fluidized by the friction stir welding is interposed at a temporary fixing position on the joining line. This makes it possible to improve friction stir welding at the temporary fixing position.

According to the present invention, in a manufacturing method for forming a wide joined body by friction stir welding a plurality of members extending in parallel using a tool having one or a plurality of shoulder surfaces, This member is abutted along the member joining line, and the next member facing the longitudinal wall located on the opposite side of the present joining line of the present member or the next member sandwiching the next member is provided on the next member. At least one of the fitting or fixing means is fixed or sandwiched by the width direction deformation prevention means, so that the adjacent front and current members are friction stir welded in the longitudinal direction along the present welding line. A method for manufacturing a joined body of a plurality of rows of members by friction stirring is obtained.
Then, temporary welding at a predetermined interval is used as the width direction deformation preventing means, and the temporary welding is used to rub the next member facing the longitudinal wall located on the opposite side of the current joining line of the current member. Performed in parallel with stir welding. Further, as the width direction deformation preventing means, a fitting means for connecting the front and present members and the present and next members on a vertical cross section of the joining line or sandwiching the joining line is used. The fitting means may prevent thermal deformation between an adjacent next member caused by friction stir welding in the longitudinal direction.

[0030]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the drawings. It should be noted that the dimensions, materials, shapes, relative arrangements, and the like of the components described in the illustrated examples are not intended to limit the scope of the present invention thereto unless otherwise specified, but are merely illustrative examples. Absent.

With reference to FIGS. 1 (a) and 1 (b), a case where a plurality of long plates (for example, flat plates of about 25 meters) are friction stir welded will be described here. In the illustrated example, a plurality of long plates extending in the long direction are butted along a long plate joining line. First, the plate member 41 is tack-welded at a predetermined interval along the joining line L1 which is the abutting portion of the long plate 31 and the long plate 32. The width of this plate material is B. After the plate material 41 is tack-welded along the joining line L1, friction stir welding is performed along the joining line L1 using the tool 42. The tool 42 has a shoulder portion 42a having a circular shoulder surface for applying frictional heat to the work piece, and a probe 42b vertically provided on the central axis of the circular shoulder surface, and the probe 42 is provided while rotating the tool 42. 42b is inserted and the tool 42 is moved along the joining line L1. Now
Assuming that the diameter of the circular shoulder surface (that is, the shoulder portion 42a) is A, A ≧ B. In friction stir welding, for example, the rotation speed of the tool 42 is 800 to 20.
00 rpm, feed speed (moving speed of tool 42) is 100
~ 1000 mm / min.

In this way, while the friction stir welding is performed along the joining line L1, that is, in parallel with the friction stir welding of the joining line L1, the abutting portion between the long plate 32 and the long plate 33 is formed. The plate member 41 is tack-welded at predetermined intervals along the joining line L2. When the tack welding of the joining line L2 is completed, friction stir welding is performed along the joining line L2.
After that, the friction stir welding is performed along the joining line after the tack welding while the tack welding of the long plates is sequentially performed. After friction stir welding the front sides of the long plates,
It is desirable to reverse and similarly perform friction stir welding on the back side as well. In this way, a joined body obtained by friction stir welding a plurality of long plates is obtained.

As described above, since the long plates are tack-welded together via the plate member 41 and then the friction stir welding is performed along the joining line, the friction heat generated during the friction stir welding, etc. This prevents the long plates 31 and 32 from being thermally deformed. As a result, the joining line L2 between the long plate 32 and the long plate 33
Therefore, a large gap does not occur, and the friction stir welding can be satisfactorily performed along the joining line L2. In addition, in the above-mentioned example, since the plate member 41 is tack-welded along the joining line at a predetermined interval, the plate member 41 can fill the concave portion generated by the tack-welding in the friction stir welding.

Furthermore, since temporary welding and friction stir welding are simultaneously performed on a plurality of rows of joining lines,
As a result, a plurality of long plates can be satisfactorily friction stir welded in a short time.

As described above, in the example shown in FIG. 1, since a large gap is prevented from occurring in the joining line, joining defects do not occur, and furthermore, tack welding and friction stir welding are performed simultaneously in parallel. Since this is performed, it is possible to obtain a joined body by joining a plurality of long plates by friction stir welding in a short time without causing a joining defect. In addition, in the example shown in FIG. 1, the plate member 41 is arranged at the welding position. However, without using the plate member 41, the long plates are temporarily joined together by spot welding or the like at a predetermined interval along the joining line. You may make it join.

As is apparent from the above description, in the example shown in FIG. 1, a plurality of long plates extending in parallel are friction stir welded using a tool having one shoulder surface to obtain a joined body. At this time, a plurality of long plates are butted together along the member joining line, and the adjacent front long plate 31 and current long plate 32 are friction stir welded in the longitudinal direction along the current joining line L1. In this case, the longitudinal wall located on the opposite side of the current joining line L1 of the member 32 is temporarily welded to the next long plate 33 facing the longitudinal wall and the adjacent member 33 produced by friction stir welding in the longitudinal direction. The thermal deformation between them is prevented. Then, this tack welding functions as a width direction deformation preventing means, and tack welding is performed in parallel with the friction stir welding. Further, a thin plate material which is plasticized by friction stir welding is interposed at the temporary welding position, and the thin plate material is, for example, a thin plate end plate existing only at the temporary bonding position.

Referring to FIG. 2, a so-called bobbin tool 43 may be used when friction stir welding a plurality of long plates. The bobbin tool 43 includes a thin probe 43a and a pair of shoulder portions 4 having a circular cross section that sandwich the probe 43a.
3b and 43c are provided, and circular shoulder surfaces are defined on the lower surface of the shoulder portion 43b and the upper surface of the shoulder portion 43c, respectively, and the shoulder surface rubs against the abutting portion of the long plates that are the workpieces. Heat is applied.
The diameter of the shoulder portions 43b and 43c is larger than the diameter of the probe 43a, and the distance between the shoulder portions 43b and 43c (that is, the distance between the shoulder surfaces) is set according to the thickness of the long plate.

First, spot welding 44 is performed on both front and back surfaces of the long plate 31 and the long plate 32 at predetermined intervals along a joining line L1 which is a butted portion, so that the long plate 31 and the long plate 3 are joined together.
2 and 2 are tack welded. Join line L1 (not shown in FIG. 2)
After the temporary welding along with, the long plates 31 and 32 are sandwiched by the shoulder portions 43b and 43c using the bobbin tool 43, the bobbin tool 43 is rotated, and the bobbin tool 43 is moved along the joint line L1 to be joined. Friction stir welding is performed along the line L1. In friction stir welding, for example, the rotation speed of the tool 42 is 800 to 2000 rpm, and the feed speed (the tool 42
Moving speed) is set to 100 to 1000 mm / min.

In this manner, while the friction stir welding is performed along the joining line L1, that is, in parallel with the friction stir welding of the joining line L1, the abutting portion between the long plate 32 and the long plate 33 is formed. Spot welding 44 is performed on both front and back surfaces at predetermined intervals along the joining line L2, and the long plate 32 and the long plate 33 are temporarily welded together. When the tack welding of the joining line L2 is completed, friction stir welding is performed along the joining line L2 using the bobbin tool 43. After that, friction welding is performed along the joining line after the tack welding while sequentially tack-welding the long plates to each other on both front and back surfaces thereof. In this way, a joined body obtained by friction stir welding a plurality of long plates is obtained.

As described above, since the long plates are tack welded together and then the friction stir welding is performed along the joining line, the long plates 31 are generated by the friction heat generated during the friction stir welding. And 32 are not thermally deformed. As a result, a large gap does not occur in the joining line L2 between the long plate 32 and the long plate 33, and the friction stir welding can be satisfactorily performed along the joining line L2. Further, since tack welding and friction stir welding are simultaneously performed in parallel for a plurality of rows of joining lines, as a result, a plurality of long plates can be satisfactorily friction stir welded in a short time.

As described above, in the example shown in FIG. 2, since a large gap is prevented from occurring in the joining line, joining defects do not occur, and furthermore, tack welding and friction stir welding are performed simultaneously in parallel. Since this is performed, it is possible to obtain a joined body by joining a plurality of long plates by friction stir welding in a short time without causing a joining defect.

As is clear from the above description, in the example shown in FIG. 2, when the friction stir welding is performed using the bobbin tool, the tack welding functioning as the width direction deformation preventing means is
This is done on both the front and back sides in parallel with friction stir welding.

With reference to FIG. 3, a description will be given here of the case of friction stir welding a plurality of long mold members extending in the longitudinal direction. In the illustrated example, an example in which the long mold members 51, 52, 53 are joined is shown, and the vertical portion 51a of the long mold member 51 is shown.
A cutout portion 51b extending in the longitudinal direction is formed at the lower end portion, and a protruding portion 51d extending in the longitudinal direction and projecting downward is formed at one end portion (the left end portion in the drawing) of the upper surface plate portion 51c. On the other hand, a notch 52b extending in the longitudinal direction is formed at the upper end of the vertical portion 52a of the long mold member 52, and a fitting piece 52c is formed. Then, one end (the right end in the drawing) of the lower surface plate portion 52d of the long shape member 52 is locked to the above-mentioned cutout portion 51b, and one end (the left end in the drawing) of the upper surface plate portion 51c engages with the cutout portion 52b. Stopped, mating piece 5
The protrusion 51d is fitted in the fitting groove defined by 2c.

Further, a cutout portion 52f extending in the longitudinal direction is formed at the upper end of the vertical portion 52e of the long die member 52, and the other end portion (the left end portion in the drawing) of the lower surface plate portion 52d extends in the longitudinal direction. A protrusion 52g protruding upward is formed. A notch 53b extending in the longitudinal direction is formed at the lower end of the vertical portion 53a of the long die member 53, and the fitting piece 5 is formed.
3c is formed. Then, one end (the right end in the drawing) of the upper surface plate portion 53d of the long die member 53 is locked to the cutout portion 52f, and the above-mentioned protrusion portion 52g is fitted in the fitting groove defined by the fitting piece 53c. To be done.

In this way, the long die members 51, 52, 5
After combining 3, the plate members 61 extending in the longitudinal direction along the joining line L1 between the long die member 51 and the long die member 52 are tack-welded along the joining line L1 at a predetermined welding interval. At this time, it is desirable to perform tack welding at both ends of the joining line L1. The width of the plate 61 is B. After the plate material 61 is temporarily welded along the joining line L1, friction stir welding is performed along the joining line L1 using the tool 42. That is, the probe 42b is inserted while rotating the tool 42, and the tool 42 is moved along the joining line L1. Now, assuming that the diameter of the circular shoulder surface (that is, the shoulder portion 42a) is A, A ≧ B is defined. In friction stir welding, for example, the rotation speed of the tool 42 is 800 to 2000.
rpm, feed speed (moving speed of the tool 42) is 100 to 1
It is set to 000 mm / min.

In this manner, while the friction stir welding is performed along the joining line L1, that is, in parallel with the friction stir welding of the joining line L1, the abutting portion of the long mold member 52 and the long mold member 53 is formed. The plate member 61 extending in the longitudinal direction along the joining line L2 is tack welded at a predetermined welding interval. The order (direction) of tack welding and the direction of friction stir welding are preferably the same. Furthermore, it is desirable to perform tack welding at both ends of the joining line L2. When the tack welding of the joining line L2 is completed, friction stir welding is performed along the joining line L2. After that, friction stir welding is performed along the joining line after the tack welding while sequentially performing the tack welding of the long shape members. In addition, after friction stir welding of the front surfaces of the long-sized members, they are reversed, and similarly, friction stir welding is performed also on the back side. In this way, a joined body obtained by friction stir welding of a plurality of long mold members is obtained.

As described above, since the long material plates are fitted to each other, the plate material 61 is temporarily welded along the joining line, and the friction stir welding is performed along the joining line. The long mold members 51 and 52 are not thermally deformed by frictional heat generated at that time. As a result, a large gap does not occur in the joining line L2 between the long mold material 52 and the long mold material 53, and the friction stir welding can be satisfactorily performed along the joining line L2. In the above example, the plate material 61
Since it was tack-welded along the longitudinal direction, even if there is some gap during friction stir welding,
The gap can be filled with the plate material 61.

Further, with respect to the joining lines of a plurality of rows, the plate member 6
Since the temporary welding of No. 1 and the friction stir welding are simultaneously performed in parallel, as a result, a plurality of long plates can be satisfactorily friction stir welded in a short time.

As described above, in the example shown in FIG. 3, since the fitting structure prevents a large gap from being formed in the joining line, no joining defect occurs, and the plate material is temporarily welded and friction stir welding is performed. Since the joining is performed in parallel, it is possible to obtain a joined body by joining a plurality of long-sized members by friction stir welding in a short time without causing a joining defect. In the example shown in FIG. 3, the plate member 61 is temporarily welded along the joining line, but the plate member 6
The friction stir welding may be simultaneously performed on a plurality of joining lines without arranging 1 along the joining line.

As is apparent from the above description, in the example shown in FIG. 3, as the width direction deformation preventing means, the long and long elongate members 51 on the front side and the current side are provided on the vertical cross section of the joining line or on both sides of the joining line. A fitting means is used to prevent thermal deformation between the 52 and the long and long strips 52 and 53 of the present position and the next and connect the long strips 53 adjacent to each other by friction stir welding in the longitudinal direction. When the long shape material is a hollow shape material such as double skin,
This fitting means is located on both sides of the member diagonally across the joining line. Further, when there is no fitting means on the joining line vertical line, thermal deformation can be completely prevented by temporarily fixing the joining line at both ends in the longitudinal direction. At this time, if a thin plate material that is plasticized by friction stir welding is interposed at a temporary fixing position on the joining line,
As a result of joining the thin plate materials by the friction stir welding, it is possible to prevent the temporary fixing traces and the like from remaining.

In the example shown in FIG. 3, the elongated member is provided with the projection and the fitting piece, and the projection is fitted to the fitting piece to prevent the deformation in the width direction. And, it is not necessary to provide a fitting piece, and if notches are formed in the upper surface plate and the lower surface plate and the long shape members (one end) are locked at these notches, the deformation in the width direction can be achieved. You can almost stop.

With reference to FIG. 4, the illustrated example shows an example in which the long-shaped members 71, 72, 73 are joined, and the vertical portion 71a of the long-shaped member 71 has a long portion at the lower end thereof. A cutout portion 71b extending in the direction is formed, and the upper surface plate portion 71c
A projection 71d extending in the longitudinal direction and projecting downward is formed at one end (the left end in the drawing) of the. On the other hand, the long shape material 7
A notch 72b extending in the longitudinal direction is formed at the upper end of the second vertical portion 72a, and a fitting piece 72c is formed. Then, one end (the right end in the drawing) of the lower surface plate portion 72d of the long shape member 72 is locked to the above-mentioned cutout portion 71b, and one end (the left end in the drawing) of the upper surface plate portion 71c engages with the cutout portion 72b. The projection 71d is fitted into the fitting groove defined by the fitting piece 72c.

Further, a cutout portion 72f extending in the longitudinal direction is formed at the lower end portion of the vertical portion 72e of the long die member 72, and a fitting piece 72g is formed. Long material 7
A notch 73b extending in the longitudinal direction is formed at the upper end of the vertical portion 73a of FIG. 3, and a protrusion 73d extending in the longitudinal direction and projecting downward is formed at one end (the right end in the drawing) of the lower surface plate portion 73c. . Then, the upper surface plate portion 72 of the long shape member 72
One end (the right end in the figure) of h is locked to the cutout portion 73b, and the protrusion 73d is fitted in the fitting groove defined by the fitting piece 72g.

In this way, the long shape members 71, 72, 7
After combining 3, the plate member 61 extending in the longitudinal direction along the joining line L1 between the long-shaped members 71 and 72 is temporarily welded along the joining line L1 at a predetermined welding interval using spot welding 74. To do. At this time, it is desirable to perform tack welding at both ends of the joining line L1. After the plate material 61 is temporarily welded along the joining line L1, friction stir welding is performed along the joining line L1 using the tool 42. That is, the probe 42b is inserted while rotating the tool 42, and the tool 42 is moved along the joining line L1.

In this way, while the friction stir welding is performed along the joining line L1, that is, in parallel with the friction stir welding of the joining line L1, it is the abutting portion of the long mold member 72 and the long mold member 73. The plate member 61 extending in the longitudinal direction along the joining line L2 is tack welded at a predetermined welding interval. The order (direction) of tack welding and the direction of friction stir welding are preferably the same. Furthermore, it is desirable to perform tack welding at both ends of the joining line L2. When the tack welding of the joining line L2 is completed, friction stir welding is performed along the joining line L2. After that, friction stir welding is performed along the joining line after the tack welding while sequentially performing the tack welding of the long shape members. In addition, after friction stir welding of the front surfaces of the long-sized members, they are reversed, and similarly, friction stir welding is performed also on the back side. In this way, a joined body obtained by friction stir welding of a plurality of long mold members is obtained.

As described above, the long material plates are fitted to each other, the plate material 61 is temporarily welded along the joining line, and the friction stir welding is performed along the joining line. The long mold members 71 and 72 are not thermally deformed by frictional heat generated at that time. As a result, a large gap does not occur in the joining line L2 between the long mold material 72 and the long mold material 73, and the friction stir welding can be satisfactorily performed along the joining line L2. In the above example, the plate material 61
Since it was tack-welded along the longitudinal direction, even if there is some gap during friction stir welding,
The gap can be filled with the plate material 61.

Further, with respect to the joining lines of a plurality of rows, the plate member 6
Since the temporary welding of No. 1 and the friction stir welding are simultaneously performed in parallel, as a result, a plurality of long plates can be satisfactorily friction stir welded in a short time.

As described above, in the example shown in FIG. 4, since the fitting structure prevents the occurrence of a large gap in the joining line, no joining defect occurs, and the plate material is tack-welded and friction stir welded. Since the joining is performed in parallel, it is possible to obtain a joined body by joining a plurality of long-sized members by friction stir welding in a short time without causing a joining defect. In the example shown in FIG. 4, the plate member 61 is temporarily welded along the joining line, but the plate member 6
The friction stir welding may be simultaneously performed on a plurality of joining lines without arranging 1 along the joining line.

As is apparent from the above description, in the example shown in FIG. 4, as the width direction deformation preventing means, the long and long elongate members 71 on the front and the current positions are formed on the vertical cross section of the joining line or sandwiching the joining line. A fitting means is used to prevent thermal deformation between the 72 and the long and long materials 72 and 73, which are present and next, and prevent the thermal deformation between the long materials 73 adjacent to each other caused by friction stir welding in the longitudinal direction. When the long shape material is a hollow shape material such as double skin,
When the tool is a tool in which the shoulder surface is located only on the surface side of the current joining line, the fitting means for adjoining long form materials is alternately provided on the diagonal line with the hollow part of the hollow form material sandwiched therebetween. Will be there. Further, when there is no fitting means on the joining line vertical line, thermal deformation can be completely prevented by temporarily fixing the joining line at both ends in the longitudinal direction. At this time, if a thin plate material that is plastically fluidized by friction stir welding is interposed at the temporary fixing position on the joining line, it is possible to prevent the temporary fixing mark etc. from remaining as a result of the thin plate material being joined by friction stir welding. can do.

In the example shown in FIG. 4, the protrusion and the fitting piece are provided on the long-sized material, and the protrusion is fitted to the fitting piece to prevent the deformation in the width direction. And, it is not necessary to provide a fitting piece, and if notches are formed in the upper surface plate and the lower surface plate and the long shape members (one end) are locked at these notches, the deformation in the width direction can be achieved. You can almost stop.

[0061]

As described above, according to the present invention,
At least one of fitting or fixing means provided on the next-order member sandwiching the next-order member facing the longitudinal wall located on the opposite side of the current joining line of the current-order member or the next-order member. Since it is fixed or sandwiched by the width direction deformation prevention means to prevent thermal deformation between the adjacent next member caused by friction stir welding in the longitudinal direction, a gap caused by thermal deformation by friction stir welding is formed. It is possible to prevent the above, and it is possible to satisfactorily perform friction stir welding of a plurality of members.

In the present invention, as the width direction deformation preventing means,
Since the next member facing the longitudinal wall located on the opposite side of the current joining line of the current member is tack welded at a predetermined interval in parallel with the friction stir welding, the tack welding is performed. There is an effect that welding and friction stir welding can proceed simultaneously, and as a result, a plurality of members can be satisfactorily friction stir welded in a short time.

In the present invention, since the thin plate material which is plasticized by friction stir welding is interposed at the tack welding positions which are performed at the predetermined intervals, it is possible to prevent the dent due to the tack welding. Moreover, there is an effect that the tack welding trace can be made invisible.

In the present invention, since the thin plate member is the thin plate end plate existing only at the temporary joining position, not only the dent due to the temporary tack welding can be prevented but also the temporary tack welding trace can be made invisible. There is an effect.

In the present invention, when the member is a long plate, when the tool is a bobbin tool in which shoulder surfaces are located on both the front and back surfaces of the current joining line, temporary welding used as width direction deformation prevention means is used. Since it is performed on both the front and back sides, if friction stir welding is performed using a bobbin tool, the long plate will not be deformed by the pressing force, and furthermore, thermal deformation during friction stir welding can be reliably prevented. effective.

In the present invention, as the width direction deformation preventing means,
On the vertical cross section of the joining line or on both sides of the joining line, between the preceding and present members, and the adjacent next member that is formed by longitudinal friction stir welding connecting the present and next members Since it is composed of fitting means that prevents thermal deformation between
The members can be easily fitted to each other, and further, the thermal deformation at the time of friction stir welding can be easily prevented.

In the present invention, when the member is a hollow member such as a double skin, the fitting means is positioned on both sides of the member diagonally across the joining line. There is an effect that deformation can be easily prevented.

In the present invention, when the member is a hollow mold member such as a double skin, when the tool is a tool in which the shoulder surface is located only on the surface side of the current joining line, adjacent members are hollow mold members. Since the hollow portions are sandwiched so as to be fitted by the fitting means provided alternately on the diagonal line, there is an effect that the deformation in the width direction of the member can be prevented by the one-side sandwiching.

In the present invention, in the case of the joining line having no fitting means on the joining line vertical line, provisional fixing is performed at least at both ends in the longitudinal direction, so that the deformation of the member in the width direction can be prevented. There is an effect.

In the present invention, since the thin plate material which is plasticized by friction stir welding is interposed at the temporary fixing position on the joining line, there is an effect that the friction stir welding at the temporary fixing position can be improved. .

[Brief description of drawings]

FIG. 1 is a diagram for explaining a first example of manufacturing a joined body of a plurality of row members by friction stirring according to the present invention,
(A) is a perspective view and (b) is a sectional view.

FIG. 2 is a sectional view for explaining a second example of manufacturing a joined body of a plurality of rows members by friction stirring according to the present invention.

FIG. 3 is a perspective view for explaining a third example of manufacturing a joined body of a plurality of rows members by friction stirring according to the present invention.

FIG. 4 is a perspective view for explaining a fourth example of manufacturing a joined body of a plurality of row members by friction stirring according to the present invention.

5A and 5B are views for explaining an example of manufacturing a joined body of a plurality of row members by conventional friction stir welding, in which FIG. 5A is a diagram showing a state before friction stir welding, and FIG. It is a figure which shows the gap of.

FIG. 6 is a diagram for explaining another example of manufacturing a joined body of a plurality of row members by conventional friction stirring.

[Explanation of symbols]

31, 32, 33 long plate 41 plate material 42 tool 43 bobbin tool 44 spot welding 51, 52, 53, 71, 72, 73 long shape material (hollow shape material) 61 long length plate material

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yasuhiro Kanagawa             Hiroshima Prefecture Mihara City Itozakicho 5007 Mitsubishi Heavy Industries             Mihara Machinery & Transportation Systems Factory (72) Inventor Hiromi Etsumi             4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima Mitsubishi             Heavy Industry Co., Ltd. Hiroshima Laboratory (72) Inventor Yukio Manabe             4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima Mitsubishi             Heavy Industry Co., Ltd. Hiroshima Laboratory F-term (reference) 4E065 CA01                 4E067 DA12 DA17

Claims (13)

[Claims] 1. A wide joint formed by friction stir welding of a plurality of members extending in parallel by using a tool having one or a plurality of shoulder surfaces, the plurality of members being along a member joining line. The front wall member and the current member that are adjacent to each other and are friction stir welded in the longitudinal direction along the current welding line, the longitudinal wall located on the opposite side of the current welding line of the current member. Is fixed or clamped by at least one width-direction deformation prevention means of fitting or fixing means provided on the next-order member sandwiching the next-order member facing the second-order member, and friction stir welding in the longitudinal direction. A joined body of a plurality of rows of members by friction stir is provided with a means for preventing thermal deformation between adjacent members next to each other. 2. The width direction deformation prevention means is provided at a predetermined interval in parallel with the friction stir welding of the next member facing the longitudinal wall located on the opposite side of the current joining line of the current member. 2. The joined body of a plurality of row members according to claim 1, wherein the joined body is a temporary welding. 3. The joining of a plurality of rows of members according to claim 2, wherein a thin plate material that is plasticized by the friction stir welding is interposed at the tack welding positions performed at the predetermined intervals. body. 4. The joined body of a plurality of row members according to claim 3, wherein the thin plate member is a thin plate end plate existing only at a temporary joining position. 5. When the member is a plate extending in the longitudinal direction and the tool is a bobbin tool in which shoulder surfaces are located on both front and back surfaces of the current joining line, the friction stir welding is performed in parallel. The joined body of a plurality of rows of members according to claim 2, wherein the temporary welding performed at a predetermined interval is a width direction deformation prevention means performed on both front and back surfaces. 6. The width direction deformation preventing means connects the front and current members and the current and next members on a vertical cross section of the joining line or sandwiching the joining line, and longitudinally connecting the members. 2. The joined body of a plurality of row members according to claim 1, wherein the joined body is configured by a fitting means that prevents thermal deformation between the adjacent member and the next-order member caused by the friction stir welding. 7. The joined body of a plurality of rows of members according to claim 6, wherein said member is a hollow mold member, and said fitting means is a fitting means located on both front and back surfaces of the member diagonally across the joining line. 8. When the member is a hollow mold member and the tool is a tool whose shoulder surface is located only on the surface side of the current joining line, the fitting means for adjoining members is a hollow mold member. The joined body of a plurality of row members according to claim 6, which is a fitting means that is alternately provided on the diagonal with the portion sandwiched therebetween. 9. The joined body of a plurality of row members according to claim 6, wherein a joining line having no fitting means on the joining line vertical line is temporarily fixed at both ends in the longitudinal direction. 10. The joined body of a plurality of row members according to claim 9, wherein a thin plate material which is plasticized by the friction stir welding is interposed at a temporary fixing position on the joining line. 11. A manufacturing method for forming a wide joined body by friction stir welding a plurality of members extending in parallel using a tool having one or a plurality of shoulder surfaces, wherein the plurality of members are Butt along the member joining line and the next member facing the longitudinal wall located on the opposite side of the current joining line of the current member, or the fitting provided on the next member sandwiching the next member Alternatively, at least one widthwise deformation preventing means of the fixing means is fixed or sandwiched, and the adjacent front member and current member are friction stir welded in the longitudinal direction along the current welding line. A method for producing a joined body of a plurality of rows of members by frictional stirring. 12. Temporary welding at a predetermined interval is used as the width direction deformation preventing means, and the temporary welding is applied to a next-order wall facing a longitudinal wall located on the opposite side of the current joining line of the current member. The method for manufacturing a joined body of a plurality of row members according to claim 11, wherein the members are joined in parallel with the friction stir welding. 13. A fitting for connecting the front and present members and the present and next members on the vertical cross section of the joining line or sandwiching the joining line as the width direction deformation preventing means. 12. The multi-row member according to claim 11, wherein the means is used to prevent thermal deformation between the adjacent next member caused by friction stir welding in the longitudinal direction by the fitting means. Of manufacturing the joined body of.