JP5862813B2 - Joining method - Google Patents

Description

  The present invention relates to a method for joining metal members using friction stirring.

  Friction stir welding (FSW = Friction Stir Welding) is known as a method for joining metal members. Friction stir welding is a process of rotating a rotating tool along the abutting portion between metal members, and plastically flowing the metal at the abutting portion by frictional heat between the rotating tool and the metal member, so that the metal members are solid-phased. It is what is joined. A rotating tool is generally formed by protruding a stirring pin (probe) on the lower end surface of a shoulder portion having a cylindrical shape. As a conventional rotating tool, for example, the one described in Patent Document 1 is known.

JP 2003-225778 A

  In the conventional joining method, a joining defect may be formed in the deep part of the plasticization area | region formed by friction stirring, and there existed a problem that the airtightness and water-tightness of a joining part fell.

  From such a viewpoint, an object of the present invention is to provide a bonding method that can be suitably bonded.

  This invention which solves such a subject is a tab material arrangement which arranges the 1st tab material and the 2nd tab material on both sides of the abutting process which abuts a pair of metal members, and the abutting part formed in the above-mentioned abutting process A step, a first tab material joining step in which friction agitation is performed on the abutting portion between the metal member and the first tab material, and a friction agitation is performed on the abutting portion between the metal member and the second tab material. A second tab member joining step to be performed, a first main joining step in which friction stir is performed from the surface side of the metal member to the abutting portion, and a friction stirring is performed from the back surface side of the metal member to the abutting portion. A second main joining step to be performed, and in the abutting step, the side surface of the other metal member is brought into close contact with the side surface of the one metal member, and the surface of the one metal member and the other metal member The surface of the metal member is flush with one of the metal members When the metal member is arranged on the right side in the advancing direction of the rotary tool for temporary joining in the first tab material joining step and the second tab material joining step, with the surface and the back surface of the other metal member being flush with each other If the metal member is arranged on the left side of the advancing direction of the temporary bonding rotary tool, the temporary bonding rotary tool is rotated counterclockwise to rotate the temporary bonding rotary tool. In the joining step, a friction stirring start position is provided on the surface side of one tab material, friction stirring is performed from the surface side of the metal member to the butt portion, and friction stirring is completed on the surface side of the other tab material. And a burr generated by friction stirring after completion of the first main joining step, turning the metal member over, and in the second main joining step, the butt portion from the back side of the metal member. Against friction Stirring, and stirring the friction while rotating the stirring pin of the rotary tool for friction stirring into the plasticized region formed in the first main joining step, and the left hole left in the first main joining step The friction stir route in the second main joining step is set so as to avoid this.

  The present invention also includes a butting step of butting a pair of metal members, a tab material disposing step of disposing a first tab member and a second tab member on both sides of the butting portion formed in the butting step, and the metal A first tab material joining step for friction stir with respect to the abutting portion between the member and the first tab material, and a second tab material for friction agitating with respect to the abutting portion between the metal member and the second tab material. A first main joining step in which friction stir is performed from the surface side of the metal member to the abutting portion; and a second book in which friction agitation is performed from the back surface side of the metal member to the abutting portion. A joining step, and in the abutting step, the side surface of the other metal member is brought into close contact with the side surface of the one metal member, and the surface of the one metal member and the surface of the other metal member are flush with each other. The back of one of the metal members and the other of the gold When the metal member is arranged on the right side in the advancing direction of the temporary joining rotary tool in the first tab material joining step and the second tab material joining step with the back surface of the member being flush, When the rotating tool is rotated to the right and the metal member is disposed on the left side in the advancing direction of the temporary joining rotary tool, the temporary joining rotary tool is rotated counterclockwise, and after the first main joining process, The burr generated by stirring is removed, the metal member is turned over, and in the second main joining step, a friction stirring start position is provided on the back side of one of the tab members, and the butt portion is formed from the back side of the metal member. The friction stir is performed on the back surface side of the other tab member, and the stirring pin of the rotary tool for friction stirring is inserted into the plasticized region formed in the first main joining process. Friction while letting Performs 拌, and sets the second route of the friction stir in the welding process so as to avoid the first leaving been punched hole in the bonding step.

  According to this joining method, the deep part of the plasticized region (front side plasticized region) formed in the first main joining step is frictionally stirred again by the stirring pin of the rotary tool in the second main joining step. Therefore, even if a joint defect or the like is formed in the deep part of the front side plasticization region, it becomes possible to correct the joint defect or the like, and it is possible to improve the air tightness and water tightness at the joint. Become. Moreover, by using a tab material, the start position and the end position of friction agitation can be set for the tab material. Furthermore, by setting the friction stir route in the second main joining step so as to avoid the hole, it is possible to prevent the plastic fluidized metal from flowing into the hole and causing a bonding defect.

  According to the joining method according to the present invention, the air tightness and water tightness of the joint can be improved.

It is a figure for demonstrating arrangement | positioning of the metal member which concerns on 1st embodiment, a 1st tab material, and a 2nd tab material, Comprising: (a) is a perspective view, (b) is a top view, (c) is ( b) is a cross-sectional view taken along the line II, and FIG. 4D is a cross-sectional view taken along the line II-II of FIG. (A) is a side view for demonstrating the rotation tool for temporary joining, (b) is a side view for demonstrating this rotation tool for joining. (A) And (b) is a typical side view for demonstrating the condition which inserts the rotary tool for temporary joining in a starting position. It is a top view for demonstrating the 1st tab material joining process, temporary joint process, and 2nd tab material joining process which concern on 1st embodiment. (A) is III-III sectional drawing of FIG. 4, (b) and (c) are sectional drawings for demonstrating the 1st main joining process which concerns on 1st embodiment. It is a figure for demonstrating the area | region which performs friction stirring in the 1st repair process which concerns on 1st embodiment, (a) is a top view, (b) is IV-IV sectional drawing of (a). . It is a top view for demonstrating the 1st repair process which concerns on 1st embodiment. It is a top view for demonstrating the 1st crossing repair process which concerns on 1st embodiment. It is VV sectional drawing of FIG. (A)-(c) is sectional drawing for demonstrating the 2nd main joining process which concerns on 1st embodiment. (A) is a side view which shows the rotation tool for main joining used at the 1st main joining process, (b) is a side view which shows the rotating tool for main joining used at the 2nd main joining process. It is the figure which showed the rotary tool for friction stirring used by 2nd embodiment, Comprising: (a) is a sectional side view, (b) is a bottom view. It is the perspective view which showed the 1st main joining process which concerns on 2nd embodiment.

[First embodiment]
In 1st embodiment, as shown in FIG. 1, the case where the metal members 1 and 1 are joined linearly is illustrated. That is, the first embodiment is a method for joining metal members using friction stirrer, and after performing friction stir as temporary joining to the abutting part between metal members, The joining method which performs friction stirring as this joining with respect to a butt | matching part is illustrated.
First, the metal members 1 and 1 to be joined will be described in detail, and the first tab member 2 and the second tab member 3 used when joining the metal members 1 and 1 will be described in detail.

  The metal member 1 is made of a metal material that can be frictionally stirred, such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, and magnesium alloy. In the present embodiment, one metal member 1 and the other metal member 1 are formed of metal materials having the same composition. Although there is no restriction | limiting in particular in the shape and dimension of the metal members 1 and 1, It is desirable to make the thickness dimension in the abutting part J1 the same at least.

  The first tab member 2 and the second tab member 3 are arranged so as to sandwich the abutting portion J1 of the metal members 1 and 1, and are attached to the metal members 1 and 1, respectively. The seam (boundary line) of the metal members 1 and 1 appearing on the side surface 14 side is covered. Although there is no restriction | limiting in particular in the material of the 1st tab material 2 and the 2nd tab material 3, In this embodiment, it forms with the metal material of the same composition as the metal member 1. FIG. Moreover, there is no restriction | limiting in particular in the shape and dimension of the 1st tab material 2 and the 2nd tab material 3, In this embodiment, the thickness dimension is made the same with the thickness dimension of the metal member 1 in the abutting part J1. Yes.

  Next, with reference to FIG. 2, the temporary bonding rotary tool A used for temporary bonding and the main bonding rotary tool B (also referred to as a friction stirring rotary tool) used for main bonding will be described in detail.

  A rotating tool A for temporary joining shown in FIG. 2A is made of a metal material harder than the metal member 1 such as tool steel, and projects into a shoulder portion A1 having a columnar shape and a lower end surface A11 of the shoulder portion A1. And an agitating pin (probe) A2 provided. The size and shape of the temporary bonding rotary tool A may be set according to the material, thickness, etc. of the metal member 1, but at least the main bonding rotating tool B used in the first main bonding step described later (see FIG. 2 (see (b)). This makes it possible to perform temporary bonding with a smaller load than the main bonding, so that it is possible to reduce the load applied to the friction stirrer at the time of temporary bonding. Since the moving speed (feeding speed) can be made higher than the moving speed of the main welding rotary tool B, the working time and cost required for temporary bonding can be reduced.

The lower end surface A11 of the shoulder portion A1 is a part that plays a role of preventing plastic scattering by pressing the plastic fluidized metal, and is formed in a concave shape in this embodiment. There is no particular limitation on the size of the outer diameter X ₁ of the shoulder portion A1, in the present embodiment, is smaller than the outer diameter Y ₁ of the shoulder portion B1 of the joining rotation tool B.

The stirring pin A2 hangs down from the center of the lower end surface A11 of the shoulder portion A1, 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 A2. There is no particular limitation on the size of the outer diameter of the stirring pin A2, in the present embodiment, the maximum outer diameter of the maximum outer diameter (upper diameter) X ₂ is stirring pin B2 rotary tool B for the joint (upper end diameter) Y less than _2, and the minimum outer diameter (bottom diameter) _{X 3} is smaller than the minimum outer diameter (bottom diameter) _{Y 3} of the stirring pin B2. The length L _A of the stirring pin A2 is preferably 3 to 15% of the thickness t (see FIG. 2B) of the metal member 1 in the abutting portion J1 (see FIG. 1A). At least, it is desirable to be smaller than the length L ₁ of the stirring pin B2 of the welding rotary tool B.

  2B is made of a metal material harder than the metal member 1 such as tool steel, and projects into a shoulder portion B1 having a cylindrical shape and a lower end surface B11 of the shoulder portion B1. A stirring pin (probe) B2 provided and a stirring blade B3 spirally engraved on the peripheral surface of the stirring pin B2 are provided.

The lower end surface B11 of the shoulder B1 is formed in a concave shape like the temporary joining rotary tool A. The stirring pin B2 hangs down from the center of the lower end surface B11 of the shoulder portion B1, and in the present embodiment, is formed in a tapered truncated cone shape. Further, on the peripheral surface of the stirring pin B2, a stirring blade B3 engraved in a spiral shape is formed. The length _{L 1} of the stirring pin B2 is preferably set to be 1/2 or more 3/4 of the thickness t of the metal member 1 in the butting portion J1 (the (a) see FIG. 1), more Preferably, it is desirable to set so as to satisfy the relationship of 1.01 ≦ 2L ₁ /t≦1.10.

The ratio of the length _{L 1} of the stirring pin B2 to the maximum outer diameter _{Y 2} of the stirring pin B2 is preferably composed of 1.33 to 2.03. The ratio of the maximum outer diameter _{Y 2} of the stirring pin B2 to the smallest outer diameter _{Y 3} of the stirring pin B2 is preferably composed of 2.00 to 2.67. The ratio of the outer diameter _{Y 1} of the shoulder portion B1 to the maximum outer diameter _{Y 2} of the stirring pin B2 is, it is desirable to configure at 1.56 to 2.14.

  Hereinafter, the joining method according to the present embodiment will be described in detail. The joining method according to the present embodiment includes (1) a preparation step, (2) a first preliminary step, (3) a first main joining step, (4) a first repair step, and (5) a first crossing. It includes a repair process, (6) a second preliminary process, (7) a second main joining process, (8) a second repair process, and (9) a second transverse repair process. The first preliminary process, the first main joining process, the first repair process, and the first transverse repair process are executed from the surface 12 side of the metal member 1, and the second preliminary process, The second main joining process, the second repair process, and the second transverse repair process are executed from the back surface 13 side of the metal member 1.

(1) Preparation process:
The preparation process will be described with reference to FIG. The preparation step is a step of preparing metal members 1 and 1 to be joined and a contact member (first tab member 2 and second tab member 3) provided with a friction stirring start position and an end position. A butting step of butting the metal members 1 and 1 to be joined, a tab material arranging step of arranging the first tab material 2 and the second tab material 3 on both sides of the butting portion J1 of the metal members 1 and 1, and a first A welding process in which the tab material 2 and the second tab material 3 are temporarily joined to the metal members 1 and 1 by welding.

  In the abutting process, as shown in FIG. 1C, the side surface 11 of the other metal member 1 is brought into close contact with the side surface 11 of the one metal member 1, and the surface 12 of the one metal member 1 and the other metal member The front surface 12 of one metal member 1 is flush, and the back surface 13 of one metal member 1 and the back surface 13 of the other metal member 1 are flush.

  In the tab material arranging step, as shown in FIG. 1 (b), the first tab material 2 is arranged on one end side of the abutting portion J1 of the metal members 1, 1, and the contact surface 21 is made to be the metal members 1, 1. The second tab member 3 is disposed on the other end side of the abutting portion J1, and the contact surface 31 is brought into contact with the side surfaces 14, 14 of the metal members 1, 1. At this time, as shown in FIG. 1 (d), the surface 22 of the first tab member 2 and the surface 32 of the second tab member 3 are flush with the surface 12 of the metal member 1, and the first tab member 2 The back surface 23 and the back surface 33 of the second tab member 3 are flush with the back surface 13 of the metal member 1.

  In the welding process, as shown in FIGS. 1A and 1B, the corners 2a and 2a formed by the metal member 1 and the first tab member 2 (that is, the side surface 14 of the metal member 1 and the The corners 2a, 2a) formed by the side surface 24 of the one tab member 2 are welded to join the metal member 1 and the first tab member 2, and are formed by the metal member 1 and the second tab member 3. The corner portions 3a, 3a (that is, the corner portions 3a, 3a formed by the side surface 14 of the metal member 1 and the side surface 34 of the second tab member 3) are welded to connect the metal member 1 and the second tab member 3 together. Join. In addition, welding may be performed continuously over the entire length of the corners 2a and 3a, or welding may be performed intermittently.

  When the preparation process is completed, the metal members 1, 1, the first tab material 2 and the second tab material 3 are placed on a frame of a friction stirrer (not shown) and cannot be moved using a jig (not shown) such as a clamp. To be restrained. In addition, when a welding process is abbreviate | omitted, a butt | matching process and a tab material arrangement | positioning process are performed on the mount frame of the friction stirring apparatus which is not shown in figure.

(2) First preliminary process:
The first preliminary process is a process performed prior to the first main joining process. In the present embodiment, the first tab material for joining the abutting portion J2 between the metal members 1 and 1 and the first tab material 2 is used. A joining step, a temporary joining step of temporarily joining the abutting portion J1 of the metal members 1, 1; a second tab material joining step of joining the abutting portion J3 of the metal members 1, 1 and the second tab material 3; A pilot hole forming step of forming a pilot hole at a friction stirring start position in one main joining step.

In the first preliminary process of the present embodiment, as shown in FIG. 4, one temporary joining rotary tool A is moved so as to form a one-stroke writing trajectory (bead), and the abutting portions J 1, J 2, Friction stirring is continuously performed on J3. That is, the stirring pin of temporary joining rotation tool A inserted at the start position S _P output friction stir A2 is moved to the end position E _P without disengaging (in see FIG. 2 (a)) to the middle, first tab member A joining process, a temporary joining process, and a 2nd tab material joining process are performed continuously. In the present embodiment, the start position S _P output friction stir First tab member 2 is provided, although the end position E _P provided on the second tab member 3, the position of the start position S _P and the end position E _P It is not intended to limit.

The procedure of friction stirring in the first preliminary process of this embodiment will be described in more detail with reference to FIGS.
First, as shown in FIG. 3 (a), to position the rotating tool A for temporary bonding directly on the start position S _P provided in place of the first tab member 2, followed by the rotating tool A for temporarily joined It is lowered while rotated clockwise presses the stirring pin A2 to the start position S _P and. The rotational speed of the rotary tool A for temporary joining is set according to the size and shape of the agitating pin A2, the material and thickness of the metal member 1 and the like which are frictionally agitated. It is set within the range of 2000 (rpm).

When the stirring pin A2 comes into contact with the surface 22 of the first tab member 2, the metal around the stirring pin A2 is plastically fluidized by frictional heat, and the stirring pin A2 is moved to the first tab as shown in FIG. Inserted into the material 2. The insertion speed (lowering speed) of the temporary joining rotary tool A is set according to the size and shape of the stirring pin A2, the material and thickness of the member on which the start position _SP is provided, In this case, it is set within a range of 30 to 60 (mm / min).

  When the entire stirring pin A2 enters the first tab member 2 and the entire lower end surface A11 of the shoulder portion A1 contacts the surface 22 of the first tab member 2, as shown in FIG. While A is rotated, it is relatively moved toward the starting point s2 of the first tab material joining step.

  The moving speed (feeding speed) of the temporary bonding rotary tool A is set in accordance with the size and shape of the agitating pin A2, the material and thickness of the metal member 1 to be frictionally agitated, etc. In this case, it is set within a range of 100 to 1000 (mm / min). The rotational speed at the time of movement of the temporary joining rotary tool A is the same as or lower than the rotational speed at the time of insertion. When the temporary joining rotary tool A is moved, the axis of the shoulder part A1 may be slightly inclined to the rear side in the traveling direction with respect to the vertical line. The direction of the joining rotary tool A can be easily changed, and complicated movement is possible. When the rotary tool A for temporary joining is moved, the metal around the stirring pin A2 is sequentially plastically fluidized, and the metal that has been plastically fluidized is hardened again at a position away from the stirring pin A2.

  When the frictional stirring is continuously performed up to the starting point s2 of the first tab material joining process by relatively moving the temporary tool A for rotating, the first tab material joining is performed without removing the temporary joining rotary tool A at the starting point s2. Move to the process.

  In the first tab material joining step, friction agitation is performed on the abutting portion J2 between the first tab material 2 and the metal members 1 and 1. Specifically, by setting a friction stir route on the joint (boundary line) between the metal members 1 and 1 and the first tab member 2, and relatively moving the temporary bonding rotary tool A along the route, Friction stirring is performed on the abutting portion J2. In the present embodiment, the friction stir is continuously performed from the start point s2 to the end point e2 of the first tab material joining step without causing the temporary joining rotary tool A to be detached.

  In addition, when the rotary tool A for temporary joining is rotated to the right, there is a possibility that a fine joining defect may occur on the left side in the traveling direction of the temporary joining rotary tool A. It is desirable to set the positions of the start point s2 and the end point e2 of the first tab material joining step so that the metal members 1 and 1 are positioned on the right side of the first tab material. If it does in this way, since it becomes difficult to generate | occur | produce a joining defect on the metal member 1 side, it becomes possible to obtain a high quality joined body.

  Incidentally, when the temporary bonding rotary tool A is rotated counterclockwise, there is a possibility that a fine bonding defect may occur on the right side of the moving direction of the temporary bonding rotary tool A. It is desirable to set the positions of the start point and end point of the first tab material joining step so that the metal members 1 and 1 are positioned on the left side of the first tab material. Specifically, although not shown, a starting point is provided at the position of the end point e2 when the temporary bonding rotary tool A is rotated to the right, and the position of the starting point s2 when the temporary bonding rotary tool A is rotated to the right. An end point may be provided at.

  Note that, when the stirring pin A2 of the temporary bonding rotary tool A enters the abutting portion J2, a force acts to separate the metal member 1 and the first tab material 2, but the metal member 1 and the first tab material 2 form the force. Since the entered corner portion 2 a is temporarily joined by welding, no opening is generated between the metal member 1 and the first tab material 2.

  When the rotary tool A for temporary joining reaches the end point e2 of the first tab material joining step, the friction stir is continuously performed to the starting point s1 of the temporary joining step without ending the friction stirring at the end point e2, and the temporary joining step is performed as it is. Transition. That is, the frictional stirring is continued without detaching the temporary joining rotary tool A from the end point e2 of the first tab material joining process to the start point s1 of the temporary joining process, and further, the temporary joining rotary tool A is detached at the start point s1. It moves to a temporary joining process without it. If it does in this way, the separation | elimination work of the rotary tool A for temporary joining in the end point e2 of a 1st tab material joining process becomes unnecessary, and also the insertion work of the rotating tool A for temporary joining in the start point s1 of a temporary joining process is unnecessary. Therefore, it becomes possible to improve the efficiency and speed of the preliminary joining work.

  In the present embodiment, the friction stir route from the end point e2 of the first tab material joining process to the start point s1 of the temporary joining process is set to the first tab material 2, and the temporary joining rotary tool A is used as the first tab material joining process. The first tab member 2 is formed with a movement locus when moving from the end point e2 to the start point s1 of the temporary joining step. If it does in this way, since it becomes difficult to generate | occur | produce a joint defect in the metal members 1 and 1 in the process from the end point e2 of a 1st tab material joining process to the start point s1 of a temporary joining process, obtaining a high quality joined body. Is possible.

Of the friction stir route in the first tab material joining step and the friction stir route from the end point e2 of the first tab material joining step to the start point s1 of the temporary joining step, the friction stir route in the first tab material joining step. distance d ₂ between the parallel portions, the securing or outer diameter X ₁ of the shoulder portion A1 of the temporary joining rotation tool a _(see FIG. 2 (a)). That is, the movement trajectory formed when the temporary bonding rotary tool A is moved from the start point s2 to the end point e2 of the first tab material joining process, and the temporary joining rotary tool A is the end point e2 of the first tab material joining process. the distance d ₂ between the movement trajectory formed when moving to the start point s1 of temporary bonding step from securing the outer diameter X ₁ or more shoulder portions A1 of the temporary joining rotation tool a. If it does in this way, even if a joining defect generate | occur | produces in the metal member 1 side of the rotary tool A for temporary joining in the process from the end point e2 of a 1st tab material joining process to the starting point s1 of a temporary joining process, the said joint defect Since it becomes difficult to reach the metal member 1, a high-quality joined body can be obtained.

  In the temporary joining step, friction stir is performed on the abutting portion J1 of the metal members 1 and 1 (see FIG. 1A). Specifically, a route for friction stirring is set on the joint (boundary line) of the metal members 1 and 1, and the temporary tool rotation tool A is moved along the route, so that the total length of the abutting portion J1 is reached. Friction stirring is continuously performed throughout. In the present embodiment, frictional stirring is continuously performed from the start point s1 to the end point e1 of the temporary bonding step without causing the temporary bonding rotary tool A to be detached in the middle. This eliminates the need for removing the temporary joining rotary tool A during the temporary joining process, thereby further increasing the efficiency and speed of the preliminary joining work.

  When the temporary joining rotary tool A reaches the end point e1 of the temporary joining step, the friction stirrer is continuously performed to the start point s3 of the second tab member joining step without ending the friction stirring at the end point e1, and the second tab material is left as it is. Transition to the joining process. That is, the frictional stirring is continued without detaching the temporary joining rotary tool A from the end point e1 of the temporary joining process to the start point s3 of the second tab member joining process, and further, the temporary joining rotary tool A is detached at the start point s3. It shifts to the 2nd tab material joining process, without. If it does in this way, the separation | elimination work of the rotary tool A for temporary joining in the end point e1 of a temporary joining process becomes unnecessary, and also the insertion work of the rotational tool A for temporary joining in the start point s3 of a 2nd tab material joining process is unnecessary. Therefore, it becomes possible to further improve the efficiency and speed of the preliminary joining work.

  In this embodiment, the friction stir route from the end point e1 of the temporary joining step to the start point s3 of the second tab member joining step is set to the second tab member 3, and the temporary joining rotary tool A is set to the end point e1 of the temporary joining step. The second tab member 3 is formed with a movement trajectory when moving from the starting point s3 of the second tab member joining step to the starting point s3. If it does in this way, since it becomes difficult to generate | occur | produce a joining defect in the metal member 1 in the process from the end point e1 of a temporary joining process to the start point s3 of a 2nd tab material joining process, it is possible to obtain a high quality joined body. It becomes.

Of the friction stir route from the end point e1 of the temporary joining step to the start point s3 of the second tab member joining step, a portion parallel to the friction stir route in the second tab member joining step to be described later and the second tab member joining The separation distance d ₃ from the friction stir route in the process is ensured to be equal to or larger than the outer diameter X ₁ (see FIG. 2A) of the shoulder portion A1 of the temporary joining rotary tool A. That is, the movement trajectory formed when the rotary tool A for temporary bonding is moved from the end point e1 of the temporary bonding process to the start point s3 of the second tab material bonding process, and the rotary tool A for temporary bonding are bonded to the second tab material. the distance d ₃ between the movement trajectory that is formed when the starting point s3 of steps moved to the end point e3, to ensure the outer diameter X ₁ or more shoulder portions A1 of the temporary joining rotation tool a. If it does in this way, even if a joint defect generate | occur | produces in the metal member 1 side of the rotary tool A for temporary joining in the process from the end point e1 of a temporary joining process to the start point s3 of a 2nd tab material joining process, the said joint defect Since it becomes difficult to reach the metal member 1, a high-quality joined body can be obtained.

  In the second tab material joining step, friction agitation is performed on the abutting portion J3 between the metal members 1, 1 and the second tab material 3. Specifically, by setting a friction stir route on the joint (boundary line) between the metal members 1 and 1 and the second tab member 3, and relatively moving the temporary joining rotary tool A along the route, Friction stirring is performed on the abutting portion J3. In the present embodiment, the friction stir is continuously performed from the start point s3 to the end point e3 of the second tab material joining step without causing the temporary joining rotary tool A to be detached.

  Since the temporary joining rotary tool A is rotated to the right, the starting point s3 and the end point e3 of the second tab material joining step are set so that the metal members 1 and 1 are positioned on the right side in the traveling direction of the temporary joining rotary tool A. Set the position of. If it does in this way, since it becomes difficult to generate | occur | produce a joining defect on the metal member 1 side, it becomes possible to obtain a high quality joined body. Incidentally, when the temporary joining rotary tool A is rotated counterclockwise, the start and end points of the second tab material joining step are set so that the metal members 1 and 1 are positioned on the left side in the advancing direction of the temporary joining rotary tool A. It is desirable to set the position. Specifically, although illustration is omitted, a starting point is provided at the position of the end point e3 when the temporary bonding rotary tool A is rotated to the right, and the position of the starting point s3 when the temporary bonding rotary tool A is rotated to the right. An end point may be provided at.

  In addition, when the stirring pin A2 (see FIG. 2A) of the temporary tool A for rotating temporarily enters the abutting portion J3, a force for separating the metal member 1 and the second tab member 3 acts. Since the corners 3 a of the first tab member 3 and the second tab member 3 are temporarily joined by welding, no opening is generated between the metal member 1 and the second tab member 3.

Once the temporary joining rotation tool A reaches the end point e3 of the second tab member joining step, without terminating the friction stir at the end point e3, the friction stir continuously until the end position E _P provided on the second tab member 3 Do. In the present embodiment, the end position E _P is provided on the extended line of the joint (boundary line) of the metal members 1 and 1 appearing on the surface 12 side of the metal member 1. Incidentally, the end position E _P is also a friction stirring start position S _M1 in a first main joining process described later.

Once the temporary joining rotation tool A reaches the end position E _P, disengaging the temporary joining rotation tool A is raised while rotating the by stirring pin A2 (see FIG. 2 (a)) from the end position E _P.

Incidentally, the desorption rate of the temporary joining rotation tool A (rising speed), the size and shape of the stirring pin A2, but in which the end position E _P is set according to the material and thickness of the members are provided, In many cases, it is set within a range of 30 to 60 (mm / min). Further, the rotational speed at the time of removal of the temporary joining rotary tool A is the same as or higher than the rotational speed at the time of movement.

Then, a pilot hole formation process is performed. Prepared hole forming step, as shown in FIG. 2 (b), a step of forming a prepared hole P1 at the start position S _M1 of the friction stir in the first of the welding process. That is, the pilot hole forming step is a step of forming the pilot hole P1 at the position where the stirring pin B2 of the main rotating tool B is to be inserted.

  The pilot hole P1 is provided for the purpose of reducing the insertion resistance (press-fit resistance) of the stirring pin B2 of the rotary tool B for main joining, and in this embodiment, the stirring pin A2 (see FIG. 2 (see (a)) is formed by expanding the diameter of the punched hole H1 formed with a drill or the like (not shown). If the punch hole H1 is used, the process of forming the pilot hole P1 can be simplified, and the working time can be shortened. Although there is no restriction | limiting in particular in the form of the pilot hole P1, In this embodiment, it is cylindrical. In addition, in this embodiment, although the pilot hole P1 is formed in the 2nd tab material 3, there is no restriction | limiting in particular in the position of the pilot hole P1, You may form in the 1st tab material 2, and the butt | matching part J2 , J3 may be preferably formed on the extended line of the joint (boundary line) of the metal members 1 and 1 appearing on the surface 12 side of the metal member 1 as in the present embodiment.

Maximum bore diameter Z ₁ of the prepared hole P1 is smaller than the maximum outer diameter (upper end diameter) Y ₂ of the stirring pin B2 of the welding rotary tool B, and preferably, the maximum outer diameter of the stirring pin B2 it is desirable to 50-90% of Y _2. Incidentally, when the maximum hole diameter Z ₁ of the prepared hole P1 is less than 50% of the maximum outer diameter Y ₂ of the stirring pin B2, there is a possibility that the degree of reduction press-in resistance of the stirring pin B2 is reduced, also, the pilot hole P When the maximum hole diameter Z ₁ exceeds 90% of the maximum outer diameter Y ₂ of the stirring pin B2, region plastically fluidized decreases becomes less generation of frictional heat generated by the stirring pin B2, since the heat input is reduced As a result, the load at the time of moving the main rotating tool B for bonding increases, and defects tend to occur.

Incidentally, when the excessively large depth Z ₂ of the prepared hole P1, since the time required for machining of the prepared hole P1 becomes longer, the depth Z ₂ of the prepared hole P1, rather than the length L ₁ of the stirring pin B2 Although it is desirable to reduce, if the depth Z ₂ of the prepared hole P1 is below 70% of the length L ₁ of the stirring pin B2, there is a possibility that the degree of reduction press-in resistance is decreased, also the lower hole P1 If the depth Z ₂ is greater than 90% of the length L ₁ of the stirring pin B2, region plastically fluidized decreases becomes less generation of frictional heat generated by the stirring pin B2, since the heat input is reduced, The load when moving the main rotating tool B for bonding increases, and defects are likely to occur. Therefore, the depth _{Z 2} of the prepared hole P should preferably be 70 to 90% of the length _{L 1} of the stirring pin B2.

  Further, if the volume of the pilot hole P1 is larger than necessary, the plastic fluidizing region is reduced, and the press-fitting resistance when the agitating pin B2 is press-fitted may increase, so the volume of the pilot hole P1 is reduced to the agitating pin B2. However, if the volume of the pilot hole P1 is less than 40% of the volume of the stirring pin B2, there is a possibility that the degree of reduction of the press-fit resistance is lowered, and the volume of the pilot hole P1. If the volume exceeds 80% of the volume of the stirring pin B2, the amount of frictional heat generated by the stirring pin B2 is reduced, the plastic fluidized region is reduced, and the heat input is reduced. The load at the time of carrying out becomes large, and it becomes easy to generate | occur | produce a defect. Therefore, the volume of the pilot hole P1 is desirably 40 to 80% of the volume of the stirring pin B2.

In addition, in this embodiment, although the case where the diameter of the hole H1 of the stirring pin A2 (see (a) of FIG. 2) of the rotary tool A for temporary joining is enlarged to be the prepared hole P1 is illustrated, the maximum outer diameter X ₂ is larger than the minimum outer diameter Y ₃ of the stirring pin B2 rotary tool B for the junction, and the maximum outer diameter X ₂ of the stirring pin A2 is smaller than the maximum outer diameter Y ₂ of the stirring pin B2 In the case of (Y ₃ <X ₂ <Y ₂ ), the hole H1 of the stirring pin A2 may be used as the pilot hole P1 as it is.

(3) First main joining process:
The first main joining step is a step of joining the abutting portions J1 of the metal members 1 and 1 in earnest. In the first main joining step according to the present embodiment, the main joining rotary tool B shown in FIG. 2B is used, and the front surface 12 side of the metal member 1 with respect to the abutting portion J1 in a temporarily joined state. Friction stir.

In a first main bonding step, as shown in (a) ~ (c) of FIG. 5, the stirring pin B2 of the welding rotary tool B inserted (press-fitted) into the prepared hole P1 formed in the start position S _M1 Then, the inserted stirring pin B2 is moved to the end position E _M1 without being removed halfway. That is, in the first main joining step, the friction stirring is started from the pilot hole P1, and the friction stirring is continuously performed up to the end position E _M1 . In this embodiment, the friction stir start position S _M1 is provided on the second tab member 3 and the end position E _M1 is provided on the first tab member 2, but the positions of the start position S _M1 and the end position E _M1 are provided. It is not intended to limit.

The first main joining process will be described in more detail with reference to FIGS.
First, as shown in FIG. 5A, the main welding rotary tool B is positioned immediately above the pilot hole P1 (start position S _M1 ), and then the main welding rotary tool B is rotated while rotating clockwise. The tip of the stirring pin B2 is inserted into the prepared hole P1. When the stirring pin B2 enters the pilot hole P1, the peripheral surface (side surface) of the stirring pin B2 comes into contact with the hole wall of the pilot hole P1, and the metal fluidizes plastically from the hole wall. In such a state, since the stirring pin B2 is press-fitted while pushing the plastic fluidized metal away from the peripheral surface of the stirring pin B2, it is possible to reduce the press-fitting resistance in the initial press-fitting stage. Since the agitating pin B2 comes into contact with the hole wall of the pilot hole P1 before the shoulder B1 of the main rotating tool B comes into contact with the surface 32 of the second tab member 3, plastic heat is generated. Time can be shortened, the load on the friction stirrer can be reduced, and in addition, the work time required for the main joining can be shortened.

The rotational speed (rotational speed at the time of insertion) of the main welding rotary tool B when the stirring pin B2 of the main welding rotary tool B is inserted into the friction stirring start position S _M1 is the size / shape of the stirring pin B2, friction is intended to be set according to the material and thickness of such a metal member 1 to be agitated like, many cases, be set within the range of seventy to seven hundred (rpm), the friction stir from the start position S _M1 It is desirable that the rotational speed of the main welding rotary tool B when moving the main welding rotary tool B toward the end position E _M1 (the rotational speed at the time of movement) is higher. In this case, compared with the case where the rotational speed at the time of insertion is the same as the rotational speed at the time of movement, the time required until the metal is plastically fluidized is shortened, so that the stirring pin B2 is inserted at the start position S _M1 . It becomes possible to work quickly.

  In addition, if the rotational speed at the time of insertion of the rotation tool B for main joining is larger than 3.0 times the rotational speed at the time of movement, the amount of heat input to the metal increases, and the metal temperature rises more than necessary. In addition, if the rotational speed at the time of insertion becomes less than 1.5 times the rotational speed at the time of movement, the effect of shortening the working time is reduced. Is preferably 1.5 to 3.0 times faster than the rotational speed during movement.

The insertion speed (lowering speed) of the main rotating tool B for welding is set in accordance with the size and shape of the stirring pin B2, the material and thickness of the member on which the start position _SM1 is provided, In this case, it is set within a range of 5 to 60 (mm / min).

  When the entire stirring pin B2 enters the second tab member 3 and the entire lower end surface B11 of the shoulder portion B1 comes into contact with the surface 32 of the second tab member 3, as shown in FIG. The main rotating tool B is relatively moved toward one end of the abutting portion J1 of the metal members 1 and 1 while stirring, and further, the abutting portion J3 is traversed to enter the abutting portion J1. When the rotating tool B for main joining is moved, the metal around the stirring pin B2 is plastically fluidized at the same time, and the plastic fluidized metal is hardened again and plasticized at a position away from the stirring pin B2. A region W1 (hereinafter referred to as “front side plasticized region W1”) is formed.

  The moving speed (feeding speed) of the rotating tool B for welding is set in accordance with the size and shape of the stirring pin B2, the material and thickness of the metal member 1 and the like that are frictionally stirred, In this case, it is set within a range of 30 to 300 (mm / min). When the main rotating tool B is moved, the axis of the shoulder B1 may be slightly inclined to the rear side in the traveling direction with respect to the vertical line. The direction of the joining rotary tool B can be easily changed, and complicated movement is possible.

  When there is a possibility that the amount of heat input to the metal member 1 may be excessive, it is desirable to cool the main member rotating tool B by supplying water from the surface 12 side. In addition, when cooling water enters between the metal members 1 and 1, there is a possibility that an oxide film is generated on the joint surface (side surface 11). However, in this embodiment, a temporary joining process is performed to perform the metal members 1 and 1. Since the joint between them is closed, it is difficult for cooling water to enter between the metal members 1 and 1, and therefore there is no possibility of deteriorating the quality of the joint.

At the abutting portion J1 of the metal members 1 and 1, a friction stir route is set on the joint of the metal members 1 and 1 (on the movement trajectory in the temporary joining step), and the main rotating tool B is relatively moved along the route. By moving, friction stir is continuously performed from one end of the abutting portion J1 to the other end. When the main rotating tool B is relatively moved to the other end of the abutting portion J1, the abutting portion J2 is moved across the abutting portion J2 while performing frictional stirring, and is moved relative to the end position E _M1 as it is.

In the present embodiment, the friction stir start position S _M1 is set on the extended line of the joint (boundary line) of the metal members 1 and 1 appearing on the surface 12 side of the metal member 1, so that the first main joining is performed. The route of friction stirring in the process can be made straight. If the route of the friction stirrer is made straight, the moving distance of the main welding rotary tool B can be minimized, so that the first main welding process can be efficiently performed. It becomes possible to reduce the wear amount of the tool B.

When the main welding rotary tool B reaches the end position E _M1 , as shown in FIG. 5C, the main welding rotary tool B is raised while rotating and the stirring pin B <b> 2 is moved to the end position E _M1 (FIG. 5). (See (b)). If the stirring pin B2 is separated upward at the end position E _M1 , a punch hole Q1 having substantially the same shape as the stirring pin B2 is unavoidably formed, but in this embodiment, it is left as it is.

The rotational speed of the main welding rotary tool B when the stirring pin B2 of the main welding rotary tool B is detached from the end position _EM1 (the rotational speed at the time of separation) may be higher than the rotational speed at the time of movement. desirable. In this case, the separation resistance of the stirring pin B2 becomes smaller than when the rotational speed at the time of separation is the same as the rotational speed at the time of movement, so that the work of removing the stirring pin B2 at the end position E _M1 can be performed quickly. Can be done.

  In addition, if the rotational speed at the time of detachment of the rotating tool B for main joining is larger than 3.0 times the rotational speed at the time of movement, the amount of heat input to the metal increases, and the metal temperature rises more than necessary. In addition, if the rotational speed at the time of detachment is less than 1.5 times the rotational speed at the time of movement, the effect of shortening the working time is reduced. Is preferably 1.5 to 3.0 times faster than the rotational speed during movement.

The disengagement speed (rising speed) of the main rotating tool B is set according to the size and shape of the stirring pin B2, the material and thickness of the member on which the starting position _SM1 is provided, In this case, it is set within a range of 5 to 60 (mm / min).

(4) First repair process:
The first repairing step is a step of performing frictional stirring on the front side plasticizing region W1 formed on the metal member 1 by the first main joining step, and may be included in the front side plasticizing region W1. This is done for the purpose of repairing certain bonding defects.

  In the first repair process according to the present embodiment, as shown in FIGS. 6A and 6B, at least the first repair region R1 and the second repair region R2 in the front side plasticized region W1. And friction stirring is performed with respect to 3rd repair area | region R3.

  Friction stirring with respect to the first repair region R1 is performed for the purpose of dividing a tunnel defect that may be formed along the traveling direction of the main rotating tool B for welding. If the rotation tool B for this welding is rotated to the right, there is a risk that a tunnel defect will occur on the left side in the traveling direction, and if it is rotated to the left, a tunnel defect may occur on the right side in the traveling direction. In the present embodiment in which the main joining rotary tool B is rotated to the right, the first repair region R1 is set so as to include at least the upper portion of the front plasticizing region W1 located on the left side in the traveling direction in plan view. Good.

Friction agitation with respect to the second repair region R2 is performed by the oxide film (the side surface 14 of the metal member 1 and the first tab member 2 of the metal member 1 being wound on the front side plasticizing region W1 when the main rotating tool B crosses the abutting portion J2. This is performed for the purpose of dividing the oxide film formed on the contact surface 21. If the end position E _M1 of the friction stir in the welding process as in the present embodiment is provided on the first tab member 2, when the main bonding rotating tool B was rotated clockwise in front plastic on the right side of the traveling direction There is a high possibility that an oxide film is caught in the upper part of the plasticizing region W1, and when it is rotated counterclockwise, there is a high possibility that the oxide film is caught in the upper part of the front plasticizing region W1 on the left side in the traveling direction. Therefore, in the present embodiment in which the rotation tool B for main joining is rotated to the right, the front side plasticizing region located on the right side in the traveling direction in plan view in the front side plasticizing region W1 adjacent to the first tab member 2. The second repair region R2 may be set so as to include at least the upper portion of W1. Note that the distance d ₄ from the joint between the metal member 1 and the first tab member 2 to the edge on the metal member 1 side of the second repair region R2 is the maximum outer diameter Y ₂ of the stirring pin B2 of the rotating tool B for welding. It is desirable to make it larger.

Friction stirring with respect to the third repair region R3 is performed by the oxide film (the side surface 14 of the metal member 1 and the second tab member 3 of the metal member 1 being wound on the front side plasticizing region W1 when the main rotating tool B crosses the abutting portion J3. This is performed for the purpose of dividing the oxide film formed on the contact surface 31. If the start position S _M1 of the friction stir in the welding process as in the present embodiment is provided on the second tab member 3, when this joining rotation tool B was rotated clockwise in front plastic to the left of the traveling direction There is a high possibility that an oxide film is caught in the upper part of the plasticizing region W1, and when it is rotated counterclockwise, there is a high possibility that the oxide film is caught in the upper part of the front plasticizing region W1 on the right side in the traveling direction. Therefore, in the present embodiment in which the main rotating tool B is rotated to the right, the front side plasticizing region located on the left side in the traveling direction in plan view in the front side plasticizing region W1 adjacent to the second tab member 3. The third repair region R3 may be set so as to include at least the upper portion of W1. The maximum outer diameter Y ₂ of the distance d ₅ is stirring pin B2 of the welding rotary tool B from the seam of the metal member 1 and the second tab member 3 to the edge of the third metallic member 1 side of the repaired region R3 It is desirable to make it larger.

  In the first repairing process according to the present embodiment, friction agitation is performed using a repairing rotating tool C smaller than the main joining rotating tool B. If it does in this way, it will become possible to prevent that a plasticization area | region spreads more than necessary.

  The repair rotary tool C is made of a metal material harder than the metal member 1, such as tool steel, like the temporary joining rotary tool A, and as shown in FIG. 6B, the shoulder C1 having a cylindrical shape. And a stirring pin (probe) C2 projecting from the lower end surface of the shoulder C1.

The stirring pin C2 hangs down from the lower end surface of the shoulder portion C1, and in this embodiment, the stirring pin C2 is formed in a tapered truncated cone shape. In addition, a stirring blade engraved in a spiral shape is formed on the peripheral surface of the stirring pin C2. The joining defect due to the main rotating tool B shown in FIG. 2 (b) is often formed in the range from the upper end of the stirring pin B2 to 1/3. The length is preferably 1/3 or more of the length L ₁ (see FIG. 2B) of the stirring pin B2 of the main rotating tool B for bonding, but when it becomes larger than 1/2, it becomes plasticized. Since there is a possibility that the area may be unnecessarily widened, it is desirable to set it to ½ or less. In addition, although there is no restriction | limiting in particular in the magnitude | size of the maximum outer diameter (upper end diameter) and minimum outer diameter (lower end diameter) of the stirring pin C2, in this embodiment, the maximum of the stirring pin B2 of the rotation tool B for this connection, respectively. It is smaller than the outer diameter (upper end diameter) Y ₂ and the minimum outer diameter (bottom diameter) Y _3.

In the first repair process, the repair rotary tool C may be detached every time frictional stirring for one repair area is completed, or a repair rotary tool C having a different form for each repair area may be used. However, in the present embodiment, as shown in FIG. 7, the first repair rotation tool C is moved so as to form a one-stroke writing movement trajectory (bead), so that the first repair region R1 and the second repair are performed. Friction stirring is continuously performed on the region R2 and the third repair region R3. That is, in the first repairing process according to the present embodiment, the end without the start position of the friction stir S for repairing and inserted into the _R rotation tool C of the stirring pin C2 (see (b) of FIG. 6) is detached in the middle It is moved to a position _{E R.} In the present embodiment, provided with a starting position S _R of the friction stir in the first tab member 2, the end position E _R provided on the second tab member 3, the second repairing region R2, the first repairing region R1 , illustrate the case where the friction stir in the order of the third repair area R3, are not intended to limit the order of the position and the friction stir start position S _R and the end position E _R.

The friction stir procedure in the first repair process will be described in more detail with reference to FIG.
First, insert the ((b) see Figure 6) first tab member start position provided in place of the 2 S _R in repairing rotating tool C of the stirring pin C2 (press-fitting) to the start of friction stir, second Friction stirring is performed on the repair region R2.

The rotational speed and the insertion speed (lowering speed) when inserting the repairing rotating tool C to start position S _R, the size and shape of the stirring pin C2, material and thickness such as metal member 1 to be friction stir However, in many cases, the rotation speed is set within a range of 300 to 2000 (rpm), and the insertion speed is set within a range of 30 to 60 (mm / min).

  Further, the moving speed (feeding speed) of the repair rotary tool C is set according to the size and shape of the stirring pin C2, the material and thickness of the metal member 1 etc. that are frictionally stirred, In the case of, it is set within a range of 100 to 1000 (mm / min). The rotational speed when the repair rotary tool C is moved is the same as or lower than the rotational speed at the time of insertion.

  When friction stir is performed on the second repair region R2, the oxide film on the side surface 14 of the metal member 1 and the contact surface 21 of the first tab member 2 becomes the front plasticization region W1 (see FIG. 6B). ), The oxide film can be divided. Therefore, even in the front side plasticized region W1 adjacent to the first tab member 2, it is difficult to generate a bonding defect. When the second repair region R2 is larger than the region where friction stirring can be performed with the repair rotary tool C, the repair rotary tool C may be U-turned several times while shifting the friction stirring route. .

  When the friction agitation with respect to the second repair region R2 is completed, the repair rotary tool C is moved to the first repair region R1 without being detached, and along the friction agitation route in the first main joining step described above. Friction stirring is performed continuously. In this way, even when tunnel defects are continuously formed along the friction stir route in the main joining process, it is possible to reliably divide the tunnel defects, so that it is difficult for joint defects to occur. Become.

  When the friction agitation with respect to the first repair region R1 is completed, the repair rotary tool C is moved to the third repair region R3 without being detached, and friction agitation is performed with respect to the third repair region R3. If it does in this way, even if it is a case where the oxide film in the side surface 14 of the metal member 1 and the contact surface 31 of the 2nd tab material 3 is wound in the front side plasticization area | region W1 (refer FIG.6 (b)). Since the oxide film can be divided, bonding defects are less likely to occur in the front side plasticized region W1 adjacent to the second tab member 3. When the third repair region R3 is larger than the region where friction stirring can be performed with the repair rotating tool C, the repair rotating tool C may be turned several times while shifting the friction stirring route. .

Third After friction stir termination for repairing region R3, to move the repairing rotating tool C to the end position E _R, repairing rotating tool C is raised while rotating the stirring pin C2 (shown in FIG. 6 (b) see ) is detached from the end position _{E R.}

The rotational speed and the desorption rate (increase rate) when disengaging the repairing rotating tool C from the end position E _R, the size and shape of the stirring pin C2, material and thickness such as metal member 1 to be friction stir However, in many cases, the rotation speed is set within a range of 300 to 2000 (rpm), and the separation speed is set within a range of 30 to 60 (mm / min). The rotational speed at the time of removal of the repair rotary tool C is the same as or higher than the rotational speed at the time of movement.

(5) First transverse repair process:
The first transverse repair process is also a process of performing frictional stirring on the front side plasticized region W1 formed on the metal member 1 by the first main joining step, and may be included in the front side plasticized region W1. This is done for the purpose of breaking a certain tunnel defect.

  In the first transverse repair process according to the present embodiment, as shown in FIG. 8, the transverse rotation tool D is moved so as to traverse the front side plasticization region W1 a plurality of times, so that the front side plasticization region W1 is moved. And friction stir. That is, in the first transverse repair process, the friction stir route is set so as to traverse the front plasticization region W1 a plurality of times. In this way, even if a tunnel defect is formed along the front-side plasticized region W1, the tunnel defect can be divided with sufficient certainty.

  In the first transverse repair process, the friction stir route is a plurality of plasticized regions (hereinafter referred to as “replasticized regions”) W3, W3,... Formed in the front side plasticized region W1. The friction stir route in the process (that is, the center line of the front side plasticizing region W1) is set so as to be separated from each other.

  The friction stir route in the first transverse repair process is provided with a plurality of intersecting routes F1 crossing the front side plasticizing region W1 and a transition route F2 connecting the same ends of the adjacent intersecting routes F1, F1. It has been. That is, the friction stir route in the first transverse repair process starts from the side of the front side plasticization region W1 and is set to go to the opposite side across the front side plasticization region W1. Starting from the end point e10 of the intersection route F1, a transition route F2 set along the friction stir route (the joint of the metal members 1 and 1) in the first main joining process, and an end point s10 of the transition route F2 And at least a second intersection route F1 set so as to go to the opposite side across the front plasticizing region W1.

  The intersection route F1 is a friction stir route set so as to cross the front side plasticization region W1, and in the present embodiment, is perpendicular to the friction stir route in the first main joining step. The start point s10 and the end point e10 of the intersection route F1 are located on the side of the front side plasticization region W1, and face each other with the front side plasticization region W1 interposed therebetween.

The positions of the start point s10 and the end point e10 of the intersection route F1 are preferably set to positions where the entire transverse rotary tool D exits from the front side plasticization region W1, but it is more than necessary from the front side plasticization region W1. When the position is set, the moving distance of the transverse rotation tool D increases. In this embodiment, the distance from the start point s10 to the side edge of the front side plasticization region W1 and the end point from the side edge of the front side plasticization region W1. distance to e10 is the outer diameter X ₄ of the shoulder portion D2 of the traversing rotating tool D is set to half the equal such a position _(see FIG. 9), the length of the cross route F1 (the end point from the start point s10 distance to e10) is to the width _{d 6} of the front plasticized region W1, equal to the value obtained by adding the outside diameter _{X 4} of the shoulder portion D2. Incidentally, since the width d ₉ of the plasticized region formed by the transverse rotation tool D is substantially equal to the outer diameter X ₄ of the shoulder portion D2, the length of the intersection route F1 is the width of the front plasticizing region W1. It becomes substantially equal to the value obtained by adding the width d ₉ of the plasticized region formed by the transverse rotary tool D to the dimension d ₆ .

The separation distance d ₇ between the adjacent intersecting routes F1, F1 is such that the replasticization regions W3, W3,... On the friction stir route (that is, the center line of the front plasticizing region W1) in the first main joining process are mutually different. The size is set so as to be separated. Incidentally, the distance d ₈ of the re-plasticized region W3, W3 Adjacent than the width d ₉ of re-plasticized region W3, more preferably it is desirable to secure more than twice the width dimension d _9.

The transition route F2 is a friction stir route from the end point e10 of one cross route F1 to the start point s10 of the other cross route F1 located on the friction stir end position E _C side from the cross route F1. In the form, it is provided on the right side or the left side of the front side plasticizing region W1, and is parallel to the route of friction stirring in the first main joining step.

The transition route F2 is desirably set at a position such that the plasticized region W4 formed by moving the transverse rotation tool D along the transition route F2 contacts the side edge of the front-side plasticized region W1. In the present embodiment, as described above, the distance between the end point e10 of the intersection route F1 that is the start point of the transition route F2 and the side edge of the front side plasticized region W1, and the start point of the intersection route F1 that is the end point of the transition route F2. the distance between the side edges of s10 and front plasticized region W1 is because is equal to the half of the plasticized region width d ₉ of which are formed by respectively traversing rotating tool D, plasticized region W4 is necessarily In addition, the side edge of the front side plasticized region W1 comes into contact.

The procedure of friction stirring in the first transverse repair process will be described in detail.
In the present embodiment, the above-described repair rotary tool C (see FIG. 6) is used as the transverse rotary tool D, and the detailed description thereof is omitted. Further, since the rotation speed, insertion speed, movement speed, separation speed, and the like of the transverse rotation tool D are the same as those of the repair rotation tool C, detailed description thereof is omitted.

In this embodiment, the traversing rotating tool D one, is moved in a zigzag shape so as to form a one-stroke movement locus (bead), continuously from the start position S _C of the friction stir to the end position E _C And friction stir. That is moved to the end position E _C without disengaging stirring pin D2 of traversing rotating tool D which has been inserted into the start position S _C of the friction stirring (see FIG. 9) in the middle. Note that the transverse rotating tool D may be detached every time the front side plasticizing region W1 is crossed. Further, in the present embodiment, provided with a start position S _C of the friction stir the metal member 1, illustrate the case in which the end position E _C in the second tab member 3, the start position S _C and the end position E _C It is not intended to limit the position of.

The procedure of friction stirring in the first transverse repair process will be described in more detail.
In a first transverse repairing step, first, inserting the stirring pin D2 (see FIG. 9) of the traversing rotating tool D to the start position S _C provided in place of the metal member 1 (press-fit) to the start of friction stir, Friction stirring is continuously performed along the first intersection route F1.

  When the crossing rotation tool D is moved along the intersection route F1, the metal at the upper part of the front side plasticizing region W1 is frictionally stirred again (see FIG. 9). Therefore, in the first repair process described above, Tunnel defects that could not be divided or tunnel defects formed at a position outside the friction stir route in the first repair process can be divided with sufficient certainty.

  When the crossing rotation tool D reaches the end point e10 of the first intersection route F1, the moving direction of the crossing rotation tool D is changed to the direction along the friction stir route in the main joining process, and along the transition route F2. While moving, the transverse rotating tool D is moved as it is along the transition route F2 without being detached at the end point e10, and the friction stir is continuously performed on the metal on the side of the front plasticizing region W1. In this embodiment, since the transfer route F2 is parallel to the friction stir route in the first main joining step, the distance of the transfer route F2 is shorter than when the transfer route F2 is inclined.

  When the crossing rotation tool D reaches the start point s10 of the second intersection route F1, the moving direction of the crossing rotation tool D is changed to a direction crossing the front plasticizing region W1, and the crossing rotation tool D is separated. Without moving, it is moved along the second crossing route F1 as it is, and the friction stir is continuously performed on the front side plasticizing region W1.

Repeating a process as described above, rise After traversing rotating tool D reaches the end point e10 of the last crossing routes F1, moves the traversing rotating tool D to the end position E _C, while rotating the traversing rotating tool D It is allowed to disengage the stirring pin D2 (see FIG. 9) from the end position E _C.

As described above, if the plurality of replasticization regions W3, W3,... Are separated from each other on the friction stir route in the first main joining step, a replasticization region is formed in the entire front side plasticization region W1. Compared to the case, the number of crossings and the number of direction changes of the crossing rotary tool D are reduced. As a result, the total length of the friction stir route in the first crossing repair process is shortened. There is no waste in movement, and as a result, tunnel defects can be efficiently divided. Particularly in this embodiment, the distance d ₈ of the re-plasticized region W3, W3 adjacent, since the width d ₉ or more re-plasticized region W3, more waste is eliminated by the movement of the traversing rotating tool D.

Note that a rotating tool different from the repairing rotating tool C may be used as the transverse rotating tool D, but even in this case, it is desirable that the rotating tool be smaller than the main rotating tool B shown in FIG. Further, since the tunnel defect due to the rotating tool B for main joining is often formed in the range from the upper end of the stirring pin to 1/3, the length of the stirring pin of the transverse rotating tool D is the same as that for main joining. it is desirable that the rotating stirring pin tool B B2 (see FIG. 2) 1/3 or more the length L ₁ of the larger than 1/2, since the plasticized region there is a risk to spread more than necessary, It is desirable to make it 1/2 or less.

  When the first transverse repair process is completed, burrs generated by friction stir in the first preliminary process, the first main joining process, the first repair process, and the first transverse repair process are removed, and further, FIG. As shown in (a), the metal members 1 and 1 are turned over, and the back surface 13 is turned up.

(6) Second preliminary process:
The second preliminary step is a step carried out prior to the second of the welding process, in the present embodiment, the lower hole to form a prepared hole P2 to the starting position S _M2 friction stir in the second of the welding process Forming step. In addition, you may include an above described 1st tab material joining process, a temporary joining process, and a 2nd tab material joining process in a 2nd preliminary | backup process.

(7) Second main joining process:
The second main joining step is a step of joining the abutting portions J1 of the metal members 1 and 1 in earnest. In the second main joining step according to the present embodiment, as shown in FIGS. 10A and 10B, the main joining rotary tool B used in the first main joining step is used, and a butt portion Friction stirring is performed on J1 from the back surface 13 side of the metal member 1.

In the second main joining step, the stirring pin B2 of the main welding rotating tool B is inserted (press-fitted) into the pilot hole P2 (start position S _M2 ) provided in the second tab member 3, and the inserted stirring pin B2 is inserted in the middle. _Is moved to the end position E _M2 provided on the first tab member 2 without being separated. That is, in the second main joining step, friction stirring is started from the pilot hole P2, and friction stirring is continuously performed up to the end position _EM2 .

The second main joining process will be described in more detail with reference to FIGS.
First, as shown in FIG. 10 (a), the main welding rotary tool B is positioned directly above the pilot hole P2, and then the main welding rotary tool B is lowered while rotating clockwise to rotate the stirring pin B2. Insert the tip into the pilot hole P2. The rotational speed at the time of insertion of the main welding rotary tool B is preferably higher than the rotational speed at the time of movement of the main welding rotary tool B, as in the case of the first main welding process described above. .

  When the entire stirring pin B2 enters the second tab member 3 and the entire lower end surface B11 of the shoulder portion B1 comes into contact with the surface of the second tab member 3, friction stirring is performed as shown in FIG. The rotating tool B for welding is relatively moved toward one end of the abutting portion J of the metal members 1 and 1 while performing the above. When the rotating tool B for main joining is moved, the metal around the stirring pin B2 is plastically fluidized at the same time, and the plastic fluidized metal is hardened again and plasticized at a position away from the stirring pin B2. A region W2 (hereinafter referred to as “back side plasticized region W2”) is formed. In the present embodiment, since the same main joining rotary tool B is used in the first main joining step and the second main joining step, the cross-sectional area of the back side plasticizing region W2 is the same as that of the front side plasticizing region W1. It is equivalent to the cross-sectional area. As in the case of the first main joining step, when moving the main welding rotating tool B, the axis of the shoulder B1 may be slightly inclined backward in the traveling direction with respect to the vertical line. Although it is good, if it makes it vertical without making it incline, the direction change of this rotation tool B for joining will become easy, and a complicated motion will be attained. Further, when there is a possibility that the amount of heat input to the metal member 1 becomes excessive, it is desirable to cool by supplying water from the back surface 13 around the rotary tool B for bonding.

When it reaches one end of the abutting portion J1 of the metal members 1, 1, the main rotating tool B is relatively moved along the joint of the metal members 1, 1 to continuously stir the other end of the abutting portion J1. Further, relative movement is performed to the end position E _M2 while performing frictional stirring.

When the friction stir is performed on the abutting portion J1, the friction stir is performed while the stirring pin B2 of the main welding rotary tool B is inserted into the front side plasticizing region W1 formed in the first main joining step. In this case, the deep portion of the front side plasticized region W1 formed in the first main joining step is frictionally stirred again by the stirring pin B2, so that the joining defect continues in the deep portion of the front side plasticized region W1. Even if it is formed as a result, it is possible to divide the junction defect and make it discontinuous, thereby improving the air tightness and water tightness at the joint. In the present embodiment, the length _{L 1} of the stirring pin B2 of the welding rotary tool B is because it is set so as to satisfy the relationship of 1.01 ≦ _2L 1 /t≦1.10 (2 (See (b)), the stirring pin B2 surely enters the front side plasticizing region W1 only by moving the main rotating tool B along the joint between the metal members 1 and 1.

When the main welding rotary tool B reaches the end position E _M2 , the main welding rotary tool B is raised while rotating to disengage the stirring pin B2 from the end position E _M2 (see FIG. 10C). As in the case of the first main joining step described above, it is desirable that the rotational speed when the main joining rotary tool B is detached be higher than the rotational speed during movement.

In addition, when the left hole Q1 left in the first main joining process and the moving route of the main welding rotary tool B in the second main joining process overlap, the plastic fluidized metal flows into the hole Q1, Since a defect may occur, the friction stirring end position E _M2 (punch hole Q2) in the second main joining step is provided at a position away from the punch hole Q1, and the second so as to avoid the punch hole Q1. It is desirable to set a friction stirring route in the main joining step and move the stirring pin B2 of the main welding rotary tool B along the route.

Further, even when the stirring pin B2 of the rotary tool B for main joining used in the second main joining process does not pass through the through hole Q1 in the first main joining process, if the separation distance is small, it is plastic. Since the fluidized metal is pushed out into the hole Q1 and a joining defect may occur, more preferably, the friction stirring end position E _M1 in the first main joining step and the second main joining step the shortest distance d ₁ in a plan view of the movement trajectory of the joining rotation tool B (terminated in this embodiment the position E _M2), it is desirable to equal to or greater than the outer diameter of the shoulder portion B1 of the joining rotation tool B .

  If the second main joining process is performed using the main joining rotary tool B used in the first main joining process as in the present embodiment, the work efficiency can be improved and the cost can be reduced. Furthermore, since the cross-sectional area of the front side plasticized region W1 and the cross-sectional area of the back side plasticized region W2 are equal, the quality of the joint becomes uniform, but the first main joining step and the second There is no problem even if a rotating tool for main bonding having a different form from that of the main bonding process is used.

When the rotary tool for main joining having different forms is used in the first main joining process and the second main joining process, for example, as shown in FIGS. the sum of the lengths L ₂ of the 'stirring pin B2' of length L ₁ of the stirring pin B2 of the welding rotary tool B and the second rotating tool B for the bonding used in this bonding process the used in the step, butting portion It is desirable to set it to the thickness t or more of the metal member 1 in J1. Needless to say, the lengths L ₁ and L _{2 of} the stirring pins B2 and B2 ′ are each less than the wall thickness t. By doing so, the deep part of the front side plasticized region W1 formed in the first main joining step is again frictionally stirred by the stirring pin B2 ′ of the main welding rotary tool B ′ used in the second main joining step. Therefore, even if the joint defect is continuously formed in the deep part of the front side plasticized region W1, the joint defect can be divided and made discontinuous. And water tightness can be improved.

More preferably, as shown in FIGS. 11A and 11B, the lengths L ₁ and L ₂ of the stirring pins B2 and B2 ′ of the main rotating tools B and B ′ are respectively set as follows. It is desirable to set it to 1/2 or more of the thickness t of the metal member 1 at the abutting portion J1, and it is desirable to set it to 3/4 or less of the thickness t. When the lengths L ₁ and L ₂ of the stirring pins B 2 and B 2 ′ are set to ½ or more of the wall thickness t, the front side plasticization region W 1 and the back side plasticization region W 2 are centered in the thickness direction of the metal member 1. And the difference between the cross-sectional area of the front-side plasticized region W1 and the cross-sectional area of the back-side plasticized region W2 becomes small, so that the quality of the joint becomes uniform and the length L of the stirring pins B2 and B2 ′ _1, the L _2, is set to 3/4 or less of the thickness t, since the backing material is not necessary when performing friction stir, it is possible to improve work efficiency.

More preferably, the lengths L ₁ and L ₂ of the stirring pins B2 and B2 ′ may be set so as to satisfy the relationship of 1.01 ≦ (L ₁ + L ₂ ) /t≦1.10. If (L ₁ + L ₂ ) / t is set to 1.01 or more, even if the metal member 1 has a dimensional tolerance or the like, in the second main joining step, the agitating pin B2 ′ is surely attached to the front side plasticizing region. It becomes possible to enter W1. If (L ₁ + L ₂ ) / t is larger than 1.10, each rotary tool becomes larger than necessary and the load applied to the friction stirrer increases, but (L ₁ + L ₂ ) / t becomes 1 If it is set to 10 or less, the load applied to the friction stirrer becomes small.

(8) Second repair process:
The second repairing step is a step of performing frictional stirring on the back side plasticized region W2 formed on the metal member 1 by the second main joining step, and may be included in the back side plasticized region W2. This is done for the purpose of repairing certain bonding defects. The second repair process is the same as the first repair process described above except that the friction stirring is performed from the back surface 13 side of the metal member 1, and thus detailed description thereof is omitted.

(9) Second transverse repair process:
The second transverse repair process is a process of performing frictional stirring on the back side plasticized region W2 formed on the metal member 1 by the second main joining step, and may be included in the back side plasticized region W2. This is done for the purpose of breaking a certain tunnel defect. The second transverse repair process is the same as the first transverse repair process described above except that the friction stirring is performed from the back surface 13 side of the metal member 1, and thus detailed description thereof is omitted.

  When the second transverse repair process is completed, burrs generated by friction stir in the second preliminary process, the second main joining process, the second repair process, and the second transverse repair process are removed. The tab material 2 and the second tab material 3 are excised.

  Even when the extremely thick metal members 1 and 1 having a thickness exceeding 40 (mm) are joined through the steps (1) to (9) as described above, the airtightness at the joined portion is obtained. And water tightness can be improved.

[Second embodiment]
In the second embodiment, when performing the first main joining step and the second main joining step, the main welding rotating tool K (also referred to as a friction stirring rotary tool K) shown in FIG. 12 is used as a rotating tool. And the case where friction stirring is performed in the state provided with the cooling plate under the metal members 1 and 1 is illustrated.
The second embodiment is the same as the first embodiment and the second embodiment except that the rotating tool K for friction stirring and the cooling plate 40 are used. Omitted.

  First, the configuration of the friction stirring rotary tool K used in the second embodiment will be described. FIGS. 12A and 12B are views showing a friction stirring rotary tool used in the second embodiment, in which FIG. 12A is a side sectional view and FIG. 12B is a bottom view.

  As shown in FIG. 12A, the friction stirring rotary tool K is made of a metal material harder than the metal member 1 such as tool steel, and has a cylindrical shoulder portion K1 and a lower end surface of the shoulder portion K1. It comprises a stirring pin (probe) K2 projecting from K11, a stirrer projection K3 projecting from the lower end surface K11, and a stirring blade K4 engraved on the peripheral surface of the stirring pin K2. Yes.

The stirring pin K2 hangs down from the center of the lower end surface K11 of the shoulder portion K1, and is formed into a tapered truncated cone shape in this embodiment. On the peripheral surface of the stirring pin K2, a stirring blade K4 that is spirally engraved to increase the stirring effect is formed. The length _{L 1} of the stirring pin K2, the maximum outer diameter _{Y 2} of the stirring pin K2, may be appropriately set according to the outside diameter _{Y 1} of the smallest outer diameter _{Y 3} and shoulder K1.

  On the lower end surface K11 of the shoulder portion K1 formed flat, a stirring ridge K3 is projected. As shown in FIG. 12B, the stirring protrusion K3 is formed in a spiral shape on the lower end surface K11 so as to surround the periphery of the stirring pin K2. By providing the stirring protrusion K3, the plastically fluidized metal flows toward the stirring pin K2, so that the efficiency of friction stirring can be increased. In addition, what is necessary is just to set suitably the length, the frequency | count, etc. of the stirring protrusion K3.

  As shown in FIG. 13, the cooling plate 40 includes a plate-like base member 41 made of a metal member, a flow path 42 penetrating the inside of the base member 41, and a heat medium tube 43 inserted through the flow path 42. Have The heat medium pipe 43 is linearly arranged inside the base member 41.

In the first main joining step or the second main joining step according to the second embodiment, the abutting portion J1 of the metal members 1 and 1 is positioned directly above the heat medium pipe 43 of the cooling plate 40. The metal members 1 and 1 are disposed on the cooling plate 40. Then, the friction stir welding is performed along the abutting portion J1 from the start position S _M1 to the end position E _M1 using the friction stir rotating tool K while flowing the heat medium (for example, cooling water) into the heat medium pipe 43. .

  According to the joining method according to the second embodiment, the amount of heat input to the metal members 1 and 1 at the time of friction stir welding can be reduced. Therefore, the distortion generated in the metal members 1 and 1 after the friction stir welding is reduced. Can be suppressed. Further, in the present embodiment, the shape of the abutting portion J1 and the planar shape of the heat medium pipe 43 through which the heat medium flows are substantially equal, and the abutting portion J1 is located directly above the heat medium pipe 43. Therefore, the cooling efficiency can be increased. In this embodiment, the heat medium pipe 43 is inserted into the flow path 42, but the heat medium may be directly flowed into the flow path 42 without using the heat medium pipe 43. In this case, it is preferable that the planar shapes of the abutting portion J1 and the flow path 42 are formed equally.

  Further, in the friction stirring rotary tool K according to the second embodiment, since the stirring protrusion K3 protrudes from the lower end surface K11, the plastic fluidized metal is gathered to the central portion of the stirring pin. Friction stirring can be performed. Thereby, while improving the efficiency of friction stirring, generation | occurrence | production of a joining defect can be suppressed. In addition, the rotating tool K for friction stirrer has a base end portion of the stirrer pin K2 that is thick and a tip end side that is tapered. The press-fit resistance can be reduced. Moreover, since the stirring blade K4 is engraved on the outer peripheral surface of the stirring pin K2, friction stirring can be performed more efficiently.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention.

  Specific bonding conditions of the bonding method according to the first embodiment described above are exemplified in Tables 1 and 2. Table 1 shows the type of alloy of the metal member 1, the first tab material 2 and the second tab material 3, the thickness, the dimensions of each rotary tool, and the dimensions of the pilot holes. The rotational speed, insertion speed, and movement speed of each rotary tool in the process are shown. In the present embodiment, the joining conditions of the first main joining process and the second main joining process are made the same, and the joining conditions of the first repair process and the second repair process are made the same. In Table 1, “JIS 5052-O” is a symbol indicating the type of aluminum alloy specified in the Japanese Industrial Standard, and is an aluminum alloy containing 2.2 to 2.8% Mg (Al—Mg series). Alloy) and an annealed aluminum alloy. “C1020” is a symbol indicating the type of copper (copper alloy) defined in Japanese Industrial Standards, and means high-purity oxygen-free copper (Cu 99.96% or more).

  Table 3 shows conditions (dimensions) of each element of the rotary tool K for friction stirrer according to the second embodiment. Table 3 shows the dimensions of the pin (stirring pin) length, the maximum pin diameter, the minimum pin diameter, and the shoulder diameter in the tools I to IV having the same configuration as the friction stirring rotary tool K. The ratio, number of rotations and welding speed are shown. Using the tools I to IV described in Table 3, friction stir welding was performed on a pair of aluminum alloys (5052 aluminum alloy), and the status of each tool in each of the tools I to IV was observed.

  When the value of pin length / pin maximum diameter exceeded 2.03, the pin was damaged. On the other hand, if the value of pin length / maximum pin diameter is less than 1.33, the load on the friction stirrer is increased, which is inappropriate and friction stirring cannot be performed to a deep position.

  When the value of the maximum pin diameter / minimum pin diameter exceeded 2.67, the maximum pin diameter was too large and the metal overflowed, resulting in surface defects. On the other hand, if the value of the maximum pin diameter / minimum pin diameter is less than 2.00, the maximum pin diameter is too small, heat input at the tip of the pin is insufficient, and bonding defects occur.

  When the value of the shoulder diameter / the maximum pin diameter exceeds 2.14, the occurrence of surface defects can be prevented, but the load on the friction stirrer is increased, which is inappropriate. On the other hand, when the value of the shoulder diameter / the maximum pin diameter was less than 1.56, the metal overflowed from the shoulder portion and surface defects occurred.

DESCRIPTION OF SYMBOLS 1 Metal member 2 1st tab material 3 2nd tab material J1-J3 Abutting part A Temporary joining rotation tool A1 Shoulder part A2 Stirring pin B Main joining rotating tool (rotating tool for friction stirring)
B1 Shoulder part B2 Stirring pin C Repair rotating tool D Crossing rotating tool G Overlaying part K Main joining rotating tool (rotating tool for friction stirring)
K1 Shoulder part K2 Stirring pin K3 Stirring rod for stirring K4 Stirring blade P1 Pilot hole W1, W2 Plasticizing region W3 Replasticizing region

Claims (2)

A butting step of butting a pair of metal members;
A tab material arrangement step of arranging the first tab material and the second tab material on both sides of the abutting portion formed in the abutting step;
A first tab material joining step of performing friction stirring on the abutting portion between the metal member and the first tab material;
A second tab material joining step of performing friction stirring on the abutting portion between the metal member and the second tab material;
A first main joining step in which friction stir is performed from the surface side of the metal member to the abutting portion;
A second main joining step of performing friction stir from the back surface side of the metal member with respect to the abutting portion,
In the abutting step, the side surface of the other metal member is brought into close contact with the side surface of the one metal member, and the surface of the one metal member and the surface of the other metal member are flush with each other. The back surface of the metal member and the back surface of the other metal member are flush with each other,
In the first tab material joining step and the second tab material joining step, when the metal member is disposed on the right side in the advancing direction of the temporary joining rotary tool, the temporary joining rotary tool is rotated to the right to When the metal member is arranged on the left side of the traveling direction of the joining rotary tool, rotate the temporary joining rotary tool counterclockwise,
In the first main joining step, a friction stirring start position is provided on the surface side of one tab material, the friction stirring is performed from the surface side of the metal member to the butt portion, and the surface side of the other tab material In addition to providing a friction stirring end position,
After completion of the first main joining step, the burrs generated by friction stirring are removed, the metal member is turned over,
In the second main joining step, friction stir is performed on the abutting portion from the back side of the metal member, and the stirring pin of the rotary tool for friction stirring is formed in the plasticized region formed in the first main joining step. And a friction stir route in the second main joining step is set so as to avoid a hole left in the first main joining step. A butting step of butting a pair of metal members;
A tab material arrangement step of arranging the first tab material and the second tab material on both sides of the abutting portion formed in the abutting step;
A first tab material joining step of performing friction stirring on the abutting portion between the metal member and the first tab material;
A second tab material joining step of performing friction stirring on the abutting portion between the metal member and the second tab material;
A first main joining step in which friction stir is performed from the surface side of the metal member to the abutting portion;
A second main joining step of performing friction stir from the back surface side of the metal member with respect to the abutting portion,
In the abutting step, the side surface of the other metal member is brought into close contact with the side surface of the one metal member, and the surface of the one metal member and the surface of the other metal member are flush with each other. The back surface of the metal member and the back surface of the other metal member are flush with each other,
In the first tab material joining step and the second tab material joining step, when the metal member is disposed on the right side in the advancing direction of the temporary joining rotary tool, the temporary joining rotary tool is rotated to the right to When the metal member is arranged on the left side of the traveling direction of the joining rotary tool, rotate the temporary joining rotary tool counterclockwise,
After completion of the first main joining step, the burrs generated by friction stirring are removed, the metal member is turned over,
In the second main joining step, a friction agitation start position is provided on the back surface side of one tab member, the friction stir is performed from the back surface side of the metal member to the abutting portion, and the back surface side of the other tab material In addition to providing a friction stirring end position, the friction stirring is performed while the stirring pin of the rotary tool for friction stirring is inserted into the plasticized region formed in the first main joining step, and the first main joining step is performed. A friction stir route in the second main joining step is set so as to avoid the left-over punch holes.

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