JP2009195949A - Manufacturing method of joined structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a joined structure capable of enhancing the airtightness and watertightness at a joining portion of metallic members. <P>SOLUTION: The joining method of the joined structure includes: a first joining step of performing the friction stir welding from a front surface A at a joining portion J1 between a first metal member 1a and a second metal member 1b; a second joining step of performing the friction stir welding from a back surface B at the joining portion J1; a recessed groove forming step of forming a recessed groove K1 along the joining portion J1 at side faces C, D; a joint member inserting step of inserting a joint member H in the recessed groove K1; a third joining step of performing the friction stir welding from the surface A to joining portions J2, J3 between the joined structure 1 and the joint member H; a fourth joining step of performing the friction stir welding from the back surface B to the joining portions J2, J3; and a side welding step of welding a non-plasticized region formed between a plasticized region W3 formed in the third joining step and a plasticized region W4 formed in a fourth joining step. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a joint structure using friction stirring.

  As a manufacturing method of a joined structure formed by abutting metal members together, a method using friction stir welding (FSW = Friction Stir Welding) is known. In this friction stir welding, the metal members are fixed to each other by causing the metal at the abutting portion to flow plastically by frictional heat between the rotating tool and the metal member by moving the rotating tool along the abutting portion between the metal members while rotating the rotating tool. Phase joining is performed. In general, a rotating tool is provided with a stirring pin (probe) protruding from the lower end surface of a shoulder portion having a cylindrical shape.

  Here, when the thickness of the metal member is larger than the length of the stirring pin of the rotary tool, by increasing the length of the stirring pin according to the thickness of the metal member, It can join without a gap over the entire length. However, since the rotary tool moves while rotating at a high speed with the stirring pin embedded in the metal member, increasing the length of the stirring pin increases the load acting on the drive means of the friction stirrer and the stirring pin. There is a problem that the life of the apparatus is shortened.

Therefore, when the thickness of the metal member is larger than the length of the stirring pin of the rotary tool, frictional stirring is performed stepwise through a joint member between a pair of metal members having step portions having different thicknesses. A method of manufacturing a joined structure by performing the method is known.
As shown in FIG. 15, the metal member used in the above-described conventional manufacturing method is thicker than the main body 101 at the edge of the main body 101, 101 of the first metal member 110a and the second metal member 110b. Small step portions 102 and 102 are formed.

  And the manufacturing method of the conventional junction structure is the butt | matching process which butt | matches step part 102,102 of the 1st metal member 110a and the 2nd metal member 110b, and butt | matching part Jd of step part 102,102. A step friction stirring step for performing friction stirring, a joint member placement step for placing the joint member U in the recess 103 formed in the abutting step, a butt portion Ja between the first metal member 110a and the joint member U, and a second metal A friction agitation step of performing friction agitation on the abutting portion Jb between the member 110b and the joint member U. According to this manufacturing method, even if it is a member with a large thickness of a metal member, metal members can be joined.

JP 2004-358535 A (see paragraph 0019, FIG. 2)

  However, in the above-described conventional method for manufacturing a joint structure, the joints of the first metal member 110 a and the second metal member 110 b and the joint member U are exposed on the side surfaces of the joint structure, and this joint is formed in the recess 103. Since it leads to the unjoined portion between the bottom surface 103a and the lower surface Ua of the joint member U, there is a problem that the air tightness and water tightness at the joined portions of the metal members 110a and 110b are lowered.

  Then, this invention makes it a subject to solve the above-mentioned problem and to provide the manufacturing method of the joining structure which can improve the airtightness and watertightness in the junction part of metal members.

  In order to solve the above-mentioned problem, the present invention is a method for manufacturing a joined structure in which end faces of a first metal member and a second metal member are butted together, and a butt portion between the first metal member and the second metal member In contrast, the first joining step of performing frictional stirring from the surface of the bonded structure, and the second bonding of performing frictional stirring from the back surface of the bonded structure to the abutting portion between the first metal member and the second metal member A groove forming step of forming a groove from the front surface to the back surface of the bonding structure along the abutting portion between the first metal member and the second metal member on the side surface of the bonding structure; A joint member inserting step of inserting the joint member into the joint member, a third joining step of performing frictional stirring from the surface of the joint structure to the abutting portion between the joint structure and the joint member, and the joint structure and the joint member A fourth joining step in which friction agitation is performed from the back surface of the joint structure to the butt portion. The unplasticized region formed between the plasticized region formed in the third joining step and the plasticized region formed in the fourth joining step at the abutting portion between the joined structure and the joint member. And a side surface welding step of welding from the side surface of the joint structure.

  In this configuration, the abutting portions of the joint structure and the joint member are joined on the front surface, the back surface, and the side surface of the joint structure, and the entire joint between the joint structure and the joint member is closed. The airtightness and watertightness at the joint with the two metal members can be improved.

In the above-described manufacturing method of the bonded structure, after the concave groove forming step, at the abutting portion between the first metal member and the second metal member, the plasticized region formed in the first bonding step and the second bonding step are formed. It can comprise so that welding may be performed from the inside of a ditch | groove with respect to the unplasticized area | region formed between the plasticized area | regions made.
In addition, after the concave groove forming step, at the abutting portion between the first metal member and the second metal member, between the plasticized region formed in the first joining step and the plasticized region formed in the second joining step. A groove portion may be formed in the concave groove along the unplasticized region formed in the step, and the groove portion may be filled with a weld metal.

In this configuration, after welding is performed from the inside of the groove to the unplasticized region formed at the abutting portion between the first metal member and the second metal member, the joint member is inserted into the groove and joined. Welding is performed from the side to the abutting portion between the structure and the joint member. Therefore, since the side part of a joining structure will be in the state welded doubly in the thickness direction, the airtightness and watertightness in the junction part of a 1st metal member and a 2nd metal member can be improved.
In the configuration in which the weld metal is filled in the groove formed along the unplasticized region, the welding metal filling operation can be easily performed, and the unplasticized region can be reliably closed.

  In the above-described method for manufacturing a bonded structure, in the side surface welding step, the plasticized region formed in the third bonding step and the plasticized region formed in the fourth bonding step at the abutting portion between the bonded structure and the joint member. A groove portion may be formed on the side surface of the joint structure along the unplasticized region formed between the two and the weld metal.

  In this configuration, the weld metal can be filled easily by filling the groove formed along the abutting portion between the joint structure and the joint member, and the unplasticized region can be reliably secured. Can be closed.

In the above-described manufacturing method of the joined structure, it is desirable to cut out a portion protruding from the side surface of the groove in the weld metal filled in the groove formed in the groove.
In this configuration, the side surface of the concave groove is formed smoothly, and the side surface of the concave groove and the outer surface of the joint member can be brought into close contact with each other, thereby improving the air tightness and water tightness at the joint portion between the joint structure and the joint member. Can be made.

In the above-described method for manufacturing a joint structure, it is desirable to cut away a portion protruding from the side surface of the joint structure of the weld metal filled in the groove formed on the side surface of the joint structure.
In this configuration, the finished surface of the joined structure can be formed smoothly by cutting away the weld metal protruding from the side surface of the joined structure.

  According to the method for manufacturing a joint structure of the present invention, since the entire joint between the joint structure and the joint member is closed, the airtightness and water tightness at the joint between the first metal member and the second metal member are improved. be able to.

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 1, the manufacturing method of the bonded structure of the present embodiment includes an end surface 11a of the first metal member 1a (see FIG. 2A) and an end surface 11b of the second metal member 1b (FIG. 2A). 2), and formed on the first side surface C and the second side surface D after performing friction stir welding from the front surface A and the back surface B of the bonded structure 1. The joint members H and H are inserted into the concave grooves K1 and K1 to perform welding joining.

  The manufacturing method of the bonded structure of the present embodiment includes (1) a butt process, (2) a first bonding process, (3) a second bonding process, (4) a groove forming process, and (5) a first side surface welding process. , (6) a joint member inserting step, (7) a third joining step, (8) a fourth joining step, and (9) a second side welding step. Hereinafter, each step will be described in detail. Note that the vertical and horizontal directions in the present embodiment follow the arrows in FIG.

(1) Butting process As shown in FIGS. 2 (a) and 2 (b), the butting process is a process in which the end surface 11a of the first metal member 1a and the end surface 11b of the second metal member 1b are butted.
As shown in FIG. 2A, the first metal member 1a and the second metal member 1b are metal members having a rectangular shape in cross section, and have substantially the same shape. The first metal member 1a and the second metal member 1b are metal materials capable of friction stirring such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, and magnesium alloy.

  In the abutting step, as shown in FIG. 2B, the end surface 11a of the first metal member 1a and the end surface 11b of the second metal member 1b are abutted, and the surface 12a of the first metal member 1a and the second metal member The surface 12b of 1b is flush with the back surface 13a of the first metal member 1a and the back surface 13b of the second metal member 1b. Further, the side surface 14a of the first metal member 1a and the side surface 14b of the second metal member 1b are flush with each other, and the side surface 15a of the first metal member 1a and the side surface 15b of the second metal member 1b are flush with each other. And the abutting part J1 is formed in the abutting surface of the end surface 11a of the 1st metal member 1a, and the end surface 11a of the 2nd metal member 1b.

A member formed by abutting the first metal member 1a and the second metal member 1b is hereinafter referred to as a joined structure 1. Moreover, the upper surface of the joining structure 1 in FIG.2 (b) is made into the surface A and the lower surface is made into the back surface B, and among the joining structures 1, it is the side surface 14a of the 1st metal member 1a, and the side surface 14b of the 2nd metal member 1b. A surface to be configured is referred to as a first side surface C. Moreover, let the surface comprised by the side surface 15a of the 1st metal member 1a and the side surface 15b of the 2nd metal member 1b among the joining structures 1 be the 2nd side surface D. FIG.
The shape and dimensions of the first metal member 1a and the second metal member 1b are not particularly limited, but it is desirable that at least the thickness dimensions at the abutting portion J1 be the same.

(2) First Joining Step As shown in FIG. 6, the first joining step is a rotating tool from the surface A of the joined structure 1 to the abutting portion J1 between the first metal member 1a and the second metal member 1b. This is a step of performing friction stir welding using G (see FIG. 4).
The first joining step is a tab material arranging step (see FIG. 3) in which the tab materials 2 and 3 are arranged on the joining structure 1, and the surface with respect to the abutting portion J1 between the first metal member 1a and the second metal member 1b And a main joining step (see FIG. 6) in which friction stirring is performed from A.

  As shown in FIG. 3, the tab material arranging step is a step of arranging a pair of tab materials 2 and 3 on both the left and right sides of the joint portion of the joint structure 1. The tab members 2 and 3 set a starting position for pressing the rotating tool G (see FIG. 4) and an ending position for releasing the rotating tool G in a friction stirring process described later.

The 1st tab material 2 and the 2nd tab material 3 are rectangular parallelepiped metal members, and the raw material equivalent to the joining structure 1 is used in this embodiment. The front surface and the back surface of the first tab material 2 and the second tab material 3 are formed flush with the front surface A and the back surface B of the bonded structure 1.
The first tab member 2 is disposed in contact with the first side surface C of the bonded structure 1, and the second tab material 3 is disposed in contact with the second side surface D of the bonded structure 1.
The 1st tab material 2 and the 2nd tab material 3, and the joining structure 1 are each temporarily joined by welding in a corner.

The rotary tool G shown in FIG. 4 is made of a metal material harder than the joining structure 1 such as tool steel, and has a shoulder part G1 that has a columnar shape, and a stirring pin that protrudes from a lower end surface G11 of the shoulder part G1 ( Probe) G2. The dimensions and shape of the rotary tool G are set according to the material and thickness of the joined structure 1.
The lower end face G11 of the shoulder part G1 is a part that plays a role of preventing the scattering to the periphery by pressing the plastic fluidized metal, and is formed in a concave shape in this embodiment.
The stirring pin G2 hangs down from the center of the lower end surface G11 of the shoulder portion G1, and is formed into a tapered truncated cone shape in this embodiment. In addition, a stirring blade engraved in a spiral shape is formed on the peripheral surface of the stirring pin G2.

  As shown in FIG. 6, in this joining step, the stirring pin G2 of the rotary tool G inserted at the friction stirring start position P1 is moved to the end position P2 without being removed halfway, and the friction stirring of the butt portion J1 is performed. It is a process of performing.

First, as shown in FIG. 5 (a), the rotary tool G is positioned immediately above the start position P1 provided at an appropriate position on the first tab member 2, and then the rotary tool G is lowered while rotating to agitation pin. G2 is pressed against the start position P1.
The rotational speed of the rotary tool G is set according to the size and shape of the stirring pin G2, the material of the joint structure 1 to be frictionally stirred, the thickness, and the like.

When the stirring pin G2 comes into contact with the surface of the first tab member 2, the metal around the stirring pin G2 is plastically fluidized by frictional heat, and the stirring pin G2 is moved to the first tab member 2 as shown in FIG. Inserted into.
In addition, when a pilot hole is formed in advance at the position where the rotary tool G is to be inserted, the press-fitting resistance when the rotary tool G is pushed in can be reduced, and the accuracy of friction stir welding can be increased and the joining operation can be performed quickly. It can be carried out.

When the entire stirring pin G2 enters the first tab member 2 and the entire lower end surface G11 of the shoulder portion G1 contacts the surface of the first tab member 2, the rotating tool G is rotated as shown in FIG. Move toward the abutting portion J1.
The moving speed (feeding speed) of the rotary tool G is set in accordance with the size and shape of the stirring pin G2, the material and thickness of the joined structure 1 to be frictionally stirred, and the like.
When the rotary tool G is moved, the metal around the stirring pin G2 is plastically fluidized in sequence, and at the position away from the stirring pin G2, the plastic fluidized metal is hardened again and the plasticized region W1 is formed. It is formed (see FIG. 5B).

  In the main joining step, the rotating tool G is continuously moved along the route set on the joint (boundary line) between the first metal member 1a and the second metal member 1b from the start position P1, thereby Friction stirring is performed on the abutting portion J1 between the metal member 1a and the second metal member 1b.

  Then, when the rotary tool G passes through the abutting portion J1 and reaches the end position P2 provided at an appropriate position of the second tab member 3, the rotary tool G is raised while rotating to disengage the stirring pin G2 from the end position P2. . Thereby, the friction stir welding on the surface A side of the bonded structure 1 is completed.

  In the present embodiment, the first tab material 2 is provided with the start position P1 and the second tab material 3 is provided with the end position P2. However, the second tab material 3 is provided with the start position P1 and the first tab material 2 is provided. May be provided with an end position P2.

(3) 2nd joining process A 2nd joining process is friction stirring from the back surface B of the joining structure 1 with respect to the abutting part J1 of the 1st metal member 1a and the 2nd metal member 1b, as shown in FIG. This is a process of joining.
In the second joining step, when the first joining step is completed, the joining structure 1 is once removed from a friction stirrer (not shown) and fixed again with the back surface B facing upward.
Since the second joining step is the same as the first joining step described above except that the tab material arranging step is not included, detailed description thereof is omitted.
In addition, the plasticization area | region formed at the 2nd joining process is made into the plasticization area | region W2. When the second joining process is completed, the tab members 2 and 3 are cut from the joined structure 1 and removed.

(4) Concave groove forming step In the concavity forming step, as shown in FIG. 8, the first metal member 1 a and the second metal member 1 b are abutted on the first side surface C and the second side surface D of the bonded structure 1. This is a step of forming the concave grooves K1, K1 along the portion J1. In this embodiment, the concave grooves K1 and K1 are continuously formed from the front surface A to the back surface B with a constant width and depth using a known cutting tool such as an end mill. In this embodiment, the depth of the groove K1 is set so that the width of the abutting portion J1 remaining between the grooves K1 and K1 on both sides is about half of the maximum width of the bonded structure 1. ing.

(5) 1st side surface welding process The 1st side surface welding process forms the 1st groove part K2 in the concave groove K1, K1 of both sides along the abutting part J1 of the 1st metal member 1a and the 2nd metal member 1b. And a weld metal filling step (see FIG. 10) for filling the first groove portion K2 with a weld metal.

In the groove forming step, as shown in FIG. 9, a concave first groove K2 is formed along the abutting portion J1 exposed on the side surfaces of the concave grooves K1, K1 on both sides. In the present embodiment, the first groove K2 is continuously formed from the front surface A to the back surface B with a constant width and depth using a known cutting tool such as an end mill.
Although the groove width of the first groove portion K2 is not limited, in this embodiment, the groove width is set to be smaller than the width of the plasticized regions W1, W2. In addition, when there exists a possibility that a cavity defect may be formed in plasticization area | region W1, W2, it is desirable to set the groove width in the 1st groove part K2 so that a cavity defect may be included.

In the weld metal filling step, as shown in FIG. 10, the first groove K2 is filled with the weld metal L1 by performing overlay welding such as MIG welding in the first groove K2. Thus, the unplasticized region formed between the plasticized region W1 on the front surface A side and the plasticized region W2 on the back surface B side is closed. Moreover, when a cavity defect is contained in the 1st groove part K2, the cavity defect is obstruct | occluded with the weld metal L1.
Note that the weld metal filling step is not limited to MIG welding, and other known welding may be performed. Moreover, although the welding material may differ from the joining structure 1, the same material is used in this embodiment.
In addition, after filling the first groove K2 with the weld metal L1, a portion of the weld metal L1 filled in the first groove K2 that protrudes from the side surface in the groove K1 is cut out.

(6) Joint member insertion step The joint member insertion step is a step of inserting the joint member H into the concave grooves K1, K1 on both sides, as shown in FIG.
The joint member H is a rectangular parallelepiped metal member, and the vertical height dimension, the horizontal width dimension, and the front-rear width dimension thereof are the same as the dimensions of the concave groove K1. In the present embodiment, the joint member H is formed of a metal material having the same composition as the bonded structure 1, but any metal material that can be frictionally stirred may be used.
In the joint member H inserted into the concave groove K1 on the first side surface C side, the surface (upper surface) and the surface A of the joined structure 1 are flush with each other, and the side surface and the side surface C of the joined structure 1 are flush with each other. The back surface (lower surface) and the back surface B of the bonded structure 1 are flush with each other.
Similarly, in the joint member H inserted into the concave groove K1 on the second side surface D side, the surface (upper surface) and the surface A of the bonded structure 1 are flush with each other, and the side surface and the side surface D of the bonded structure 1 are aligned. The back surface (lower surface) and the back surface B of the bonded structure 1 are flush with each other.

(7) Third Joining Process As shown in FIG. 13, the third joining process is performed from the surface A of the joined structure 1 to the abutting portions J2 and J3 between the joined structure 1 and the joint members H and H. This is a step of performing friction stir welding using the rotary tool G (see FIG. 4).
In the third joining step, the tab material arranging step (see FIG. 12) for arranging the tab materials 4 and 5 on the joined structure 1 and the abutting portions J2 and J3 between the joined structure 1 and the joint members H and H are provided. And a main joining step (see FIG. 13) in which friction stirring is performed from the surface A.

  As shown in FIG. 12, the tab material arranging step is a step of arranging a pair of tab materials 4 and 5 on both the left and right sides of the joint portion of the joint structure 1. The tab members 4 and 5 set start positions P3 and P5 for pressing the rotary tool G (see FIG. 4) and end positions P4 and P6 for releasing the rotary tool G in a main joining process described later. (See FIG. 13).

The 3rd tab material 4 and the 4th tab material 5 are rectangular parallelepiped metal members, and the raw material equivalent to the joining structure 1 is used in this embodiment. The front surface and the back surface of the third tab material 4 and the fourth tab material 5 are formed flush with the front surface A and the back surface B of the bonded structure 1.
The third tab member 4 is disposed in contact with the first side surface C of the bonded structure 1, and the fourth tab material 5 is disposed in contact with the second side surface D of the bonded structure 1.
The 3rd tab material 4 and the 4th tab material 5, and the joining structure 1 are each temporarily joined by welding in a corner.

In this joining step, as shown in FIG. 13, the stirring pin G2 of the rotary tool G (see FIG. 4) inserted at the start position P3 set on the surface of the third tab member 4 is connected to the joining structure 1 and the right side. By passing through the joint with the joint member H and moving to the end position P4 set on the surface of the third tab member 4, the friction stir of the abutting portion J2 between the joint structure 1 and the right joint member H is performed. Do.
Similarly, the stirring pin G2 of the rotary tool G inserted at the start position P5 set on the surface of the fourth tab member 5 passes through the joint between the joint structure 1 and the left joint member H, and the fourth tab. By moving to the end position P <b> 6 set on the surface of the material 5, the friction stir of the abutting portion J <b> 3 between the joint structure 1 and the left joint member H is performed.
Note that the friction stir welding performed in the third joining step is equivalent to the friction stir welding performed in the first joining step and the second joining step, and thus detailed description thereof is omitted.

(8) Fourth Joining Process As shown in FIG. 14, the fourth joining process starts from the back surface B of the joined structure 1 with respect to the abutting portions J2 and J3 between the joined structure 1 and the joint members H and H. This is a step of performing frictional stirring using the rotary tool G (see FIG. 4).
In the fourth joining step, when the third joining step is finished, the joining structure 1 is once removed from a friction stirrer (not shown) and fixed again with the back surface B facing upward.
Since the fourth joining step is the same as the third joining step described above except that the tab material arranging step is not included, detailed description thereof is omitted.
Note that the plasticized region formed in the fourth joining step is referred to as a plasticized region W4. When the fourth joining process is completed, the tab members 4 and 5 are removed from the joined structure 1 by cutting.

(9) Second side surface welding step In the second side surface welding step, on both side surfaces C and D of the joined structure 1, along the abutting portions J2 and J3 between the joined structure 1 and the joint member H, the second groove portion K3 is provided. And a weld metal filling step (see FIG. 1) for filling the second groove K3 with a weld metal.

In the groove forming step, as shown in FIG. 14, a concave second groove K3 is formed along the abutting portions J2 and J3 exposed on both side surfaces C and D of the bonded structure 1. In the present embodiment, the second groove portion K3 is continuously formed from the front surface A to the back surface B with a constant width and depth using a known cutting tool such as an end mill.
Although the groove width of the second groove portion K3 is not limited, in the present embodiment, the groove width is set to be smaller than the widths of the plasticized regions W3 and W4. In addition, when there exists a possibility that a cavity defect may be formed in plasticization area | region W3, W4, it is desirable to set the groove width in the 2nd groove part K3 so that a cavity defect may be included.

In the weld metal filling step, as shown in FIG. 1, the second groove K3 is filled with weld metal L2 by performing overlay welding such as MIG welding. As a result, the unplasticized region formed between the plasticized region W3 on the front surface A side and the plasticized region W4 on the rear surface B side is closed. Moreover, when a cavity defect is contained in the 2nd groove part K3, the cavity defect is obstruct | occluded with the weld metal L2.
Note that the weld metal filling step is not limited to MIG welding, and other known welding may be performed. Moreover, although the welding material may differ from the joining structure 1, the same material is used in this embodiment.
Further, after the second groove K3 is filled with the weld metal L2, portions of the weld metal L2 filled in the second groove K3 that protrude from the side surfaces C and D of the joined structure 1 are cut off.

  Through the above steps, as shown in FIG. 1, the end surface 11a of the first metal member 1a (see FIG. 2A) and the end surface 11b of the second metal member 1b (see FIG. 2A) are formed. A joined structure 1 is formed.

  According to the method for manufacturing a bonded structure of the present embodiment, as shown in FIG. 1, the bonded structure 1 and the joint members H, H are provided on the front surface A, the back surface B, and both side surfaces C, D of the bonded structure 1. Are joined together, and the entire joint between the joint structure 1 and each joint member H, H is closed, so that the airtightness at the joint between the first metal member 1a and the second metal member 1b and Water tightness can be improved.

Further, in the first side surface welding step, after the welding is performed from the inside of the groove K1 to the abutting portion J1 between the first metal member 1a and the second metal member 1b, the joint member H is inserted into the groove K1. In the second side surface welding step, welding is performed from the side surfaces C and D to the abutting portions J2 and J3 between the joined structure 1 and the joint member H. Therefore, since the side part of the joining structure 1 will be in the state double-welded in the thickness direction, improving the airtightness and watertightness in the junction part of the 1st metal member 1a and the 2nd metal member 1b. Can do.
In particular, as in this embodiment, when the width of the abutting portion J1 is set to be about half of the maximum width of the bonded structure 1, welding is performed at the center of the bonded structure 1, It is possible to improve the air tightness and water tightness at the joint between the one metal member 1a and the second metal member 1b.

  Further, in the first side surface welding step, the first groove K2 formed along the abutting portion J1 is filled with the weld metal F1, and in the second side surface welding step, the second groove formed along the abutting portions J2 and J3. By filling the groove portion K3 with the weld metal L2, the work of filling the weld metals L1 and L2 can be easily performed, and the abutting portions J1, J2, and J3 can be reliably closed.

  Further, in the first side surface welding step, the side surface of the concave groove K1 is formed smoothly by cutting away the portion of the weld metal L2 filled in the first groove portion K2 that protrudes from the side surface of the concave groove K1. Since the side surface of K1 and the outer surface of the joint member H can be brought into close contact with each other, the air tightness and water tightness at the joint portion between the joint structure 1 and the joint member H can be improved.

  Further, in the second side surface welding step, the finished surface of the joint structure 1 is smoothed by cutting out the portions protruding from the side surfaces C and D of the joint structure 1 in the weld metal filled in the second groove K3. Can be molded.

The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the spirit of the present invention.
For example, in the first side surface welding step of the present embodiment, as shown in FIG. 10, the first groove portion K2 is formed from the front surface A to the back surface B along the abutting portion J1, but on the front surface A side. A groove is formed in a portion corresponding to the unplasticized region formed between the plasticized region W1 and the plasticized region W2 on the back surface B side, and the unplasticized region is closed by filling the groove with weld metal. May be.

  Further, in the second side surface welding step of the present embodiment, as shown in FIG. 14, the second groove portion K3 is formed from the front surface A to the back surface B along the abutting portions J2 and J3. A groove portion is formed in a portion corresponding to the unplasticized region formed between the plasticizing region W3 on the side B and the plasticizing region W4 on the back surface B side, and the weld metal is filled in the groove portion to thereby form the unplasticized region. May be closed.

  Moreover, you may perform the temporary joining process of carrying out friction stir welding of the abutting part J1 using a rotary tool smaller than rotating tool G (refer FIG. 4) before a 1st joining process and a 2nd joining process. Thus, by temporarily joining the abutting portion J1, it is possible to prevent the opening of the mesh when the rotary tool G is pushed into the abutting portion J1. Similarly, by temporarily joining the abutting portions J2 and J3 before the third joining step, it is possible to prevent the opening from being generated when the rotary tool G is pushed into the abutting portions J2 and J3.

Moreover, in the 1st joining process of this embodiment, and a 2nd joining process, as shown in FIG. 6, although a pair of tab materials 2 and 3 are arrange | positioned at the right-and-left both sides of the joining structure 1, tab material is not necessarily required. It does not have to be provided. Thus, when a tab material is omitted, the start and end positions of friction stirring are set at both ends of the abutting portion J1 between the first metal member 1a and the second metal member 1b, and the first side surface welding step In this case, it is desirable to form the first groove portion K2 so that the start position and the end position of friction stirring are cut off.
Similarly, the start and end positions of friction stirring are set at both ends of the abutting portions J2 and J3 without providing a tab material in the third joining step and the fourth joining step, and the second side welding step is started. It is desirable to form the third groove portion K3 so that the position and the end position are cut off.

  Further, in this embodiment, as shown in FIG. 11, the cross-sectional shape of the concave groove K1 is formed in a rectangular shape, and a rectangular parallelepiped joint member H is inserted into the concave groove K1, but the concave groove K1 and the joint member H The shape is not limited and may be other shapes.

It is the perspective view which showed the joining structure joined by the manufacturing method of this embodiment. It is the figure which showed the butt | matching process of this embodiment, (a) is a perspective view before matching a 1st metal member and a 2nd metal member, (b) is a butt | matching 1st metal member and a 2nd metal member. FIG. It is the perspective view which showed the tab material arrangement | positioning process in the 1st joining process of this embodiment. It is the side view which showed the rotation tool of this embodiment. It is the figure which showed the use condition of the rotary tool of this embodiment, (a) is a side view when a rotary tool is made to contact a tab material, (b) is a side view when a rotary tool is pushed into a tab material. It is. It is the top view which showed the main joining process in the 1st joining process of this embodiment. It is the perspective view which showed the joining structure of the state which removed the tab material after finishing the 2nd joining process of this embodiment. It is the perspective view which showed the ditch | groove formation process of this embodiment. It is the perspective view which showed the groove part formation process in the 1st side surface welding process of this embodiment. It is the perspective view which showed the weld metal filling process in the 1st side surface welding process of this embodiment. It is the perspective view which showed the joint member insertion process of this embodiment. It is the perspective view which showed the tab material arrangement | positioning process in the 3rd joining process of this embodiment. It is the top view which showed the main joining process in the 3rd joining process of this embodiment. It is the perspective view which showed the groove part formation process in the 2nd side surface welding process of this embodiment. It is sectional drawing which showed the manufacturing method of the conventional joining structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Joining structure 1a 1st metal member 1b 2nd metal member A surface B back surface C 1st side surface D 2nd side surface H joint member J1 butt | matching part (1st metal member and 2nd metal member)
J2 butt (joint structure and joint member)
J3 butt (joint structure and joint member)
K1 Groove K2 First groove K3 Second groove L1 Weld metal L2 Weld metal G Rotary tool G2 Stirring pin W1 Plasticization region (surface)
W2 Plasticization region (back side)
W3 Plasticization region (surface)
W4 Plasticization region (back side)

Claims (6)

It is a manufacturing method of a joined structure formed by abutting end surfaces of a first metal member and a second metal member,
A first joining step in which friction agitation is performed from the surface of the joined structure with respect to the abutting portion between the first metal member and the second metal member;
A second joining step in which friction agitation is performed from the back surface of the joined structure with respect to the abutting portion between the first metal member and the second metal member;
On the side surface of the bonded structure, along the abutting portion between the first metal member and the second metal member, a groove forming step for forming a groove from the surface to the back surface of the bonded structure;
A joint member inserting step of inserting a joint member into the concave groove;
A third joining step in which friction stir is performed from the surface of the joined structure, with respect to the abutting portion between the joined structure and the joint member;
For the abutting portion between the joint structure and the joint member, a fourth joining step of performing frictional stirring from the back surface of the joint structure;
An unplasticized region formed between the plasticized region formed in the third joining step and the plasticized region formed in the fourth joining step at the abutting portion between the joined structure and the joint member. On the other hand, the manufacturing method of the junction structure characterized by including the side surface welding process which welds from the side surface of the said junction structure.   After the concave groove forming step, at the abutting portion between the first metal member and the second metal member, the plasticized region formed in the first joining step and the plasticized region formed in the second joining step The method for manufacturing a joined structure according to claim 1, wherein welding is performed from the inside of the groove to an unplasticized region formed between the two.   After the concave groove forming step, at the abutting portion between the first metal member and the second metal member, the plasticized region formed in the first joining step and the plasticized region formed in the second joining step 2. The method for manufacturing a joint structure according to claim 1, wherein a groove portion is formed in the concave groove along an unplasticized region formed between and a weld metal in the groove portion. .   In the side surface welding step, formed at the abutting portion between the joint structure and the joint member between the plasticized region formed in the third joining step and the plasticized region formed in the fourth joining step. The groove part is formed in the side surface of the said joining structure along the made unplasticized area | region, and this groove part is filled with a weld metal, It is any one of Claims 1-3 characterized by the above-mentioned. A method for manufacturing a joined structure.   4. The method for manufacturing a joint structure according to claim 3, wherein a portion of the weld metal filled in the groove formed in the groove is protruded from a side surface of the groove.   The method for manufacturing a joined structure according to claim 4, wherein a portion of the weld metal filled in a groove formed on the side surface of the joined structure is projected from the side surface of the joined structure.

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