JP4957568B2 - 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. In general, the rotating tool is formed by protruding a stirring pin (probe) on the lower end surface of a cylindrical shoulder portion.

For example, when the friction stirrer is performed using a rotary tool on the abutting part of a pair of metal members, a tunnel-like cavity defect (hereinafter also referred to as a tunnel defect) is formed inside the plasticized region formed by the friction stirrer. It may be formed. In addition, for example, when friction stirrer is performed using a rotary tool for the abutting portions of a pair of metal members, a pair of tab members are used on both side surfaces of the abutting portion, and the friction stirring start position and An end position may be set. In such a case, there is a possibility that an oxide film formed between the tab material and the metal member is wound into the metal member by performing frictional stirring.
In either case, there is a possibility that a bonding defect may be formed in the bonded metal member, and there is a problem that the air tightness and water tightness of the metal member are lowered.

  Therefore, Patent Document 1 discloses an invention for repairing a joint defect formed inside a plasticized region by performing frictional stirring again on the plasticized region formed by friction stirring.

Japanese Patent Laid-Open No. 2002-1552

Here, when performing frictional stirring, the rotating tool is moved while pushing the lower end of the shoulder portion of the rotating tool into the metal member at a predetermined depth and pressing the metal member. Therefore, the groove | channel which makes a plasticization area | region a bottom face will generate | occur | produce in the surface of the metal member after joining.
Here, as in the invention according to Patent Document 1, when a rotary tool is pushed into the surface of the plasticized region and friction stir is performed again, a groove is further formed in the repaired portion. There was a problem that would become large.

  From such a point of view, the present invention provides a joining method capable of reliably sealing a joining defect formed in a plasticized region and suppressing the formation of a groove formed when repairing. Is an issue.

  The joining method according to the present invention that solves such a problem includes a main joining step in which friction stir is performed on a butt portion between metal members, and overlay welding on a plasticized region formed in the main joining step. A welding method including a welding step and a repair step in which friction stir is performed on the weld metal formed by the welding step and the plasticized region, and the rotating tool used in the main joining step is When the rotating tool is rotated, the welding process and the repairing process are performed on the plasticizing region on the left side in the traveling direction of the rotating tool, and when the rotating tool used in the main joining process is rotated counterclockwise, the rotating tool The welding step and the repairing step are performed on the plasticized region on the right side in the traveling direction.

  According to this joining method, since the friction stir is performed while the weld metal is pushed into the joint defect inside the plasticized region formed by the friction stir, the joint defect can be reliably sealed. That is, by appropriately welding and friction stir (repair process) according to the rotation direction of the rotating tool on the right or left side of the plasticizing region in the traveling direction, the cavity defects formed inside the plasticizing region can be reliably obtained. It is possible to improve the air tightness and water tightness of the metal member. Also, by performing build-up welding before performing the repair process, and forming the weld metal on the surface of the plasticized region, the metal will be replenished to the groove formed during the main joining process, The generation of grooves during the repair process can be suppressed.

  The present invention also includes a main joining step in which friction stir is performed on the abutting portion between the metal members, a welding step in which overlay welding is performed on the plasticized region formed in the main joining step, and the welding step. And a repairing step of performing friction stir with respect to the weld metal formed by the method and the plasticizing region, and in the main joining step, disposed on the side of the butt portion between the metal members It is preferable that a friction stirring start position is provided in the tab material, and the welding step and the repairing step are performed on at least the plasticizing region adjacent to the tab material.

  According to such a joining method, since the friction stir is performed while the weld metal is pushed into the oxide film wound inside the plasticized region by the friction stir, the joining defect can be reliably sealed. Also, by performing build-up welding before performing the repair process, and forming the weld metal on the surface of the plasticized region, the metal will be replenished to the groove formed during the main joining process, The generation of grooves during the repair process can be suppressed.

  Further, when the rotating tool used in the main joining process is rotated to the right, the welding process and the repairing process are performed on the plasticizing region on the left side in the traveling direction of the rotating tool, and the rotation used in the main joining process is performed. When the tool is rotated counterclockwise, it is preferable to perform the welding step and the repairing step on the plasticizing region on the right side in the traveling direction of the rotary tool. Thus, work efficiency can be improved by repairing according to the area | region where possibility that a joint defect will generate | occur | produce is high.

  The present invention also includes a main joining step in which friction stir is performed on the abutting portion between the metal members, a welding step in which overlay welding is performed on the plasticized region formed in the main joining step, and the welding step. And a repairing step of performing friction stir with respect to the weld metal formed by the method and the plasticizing region, and in the main joining step, disposed on the side of the butt portion between the metal members It is preferable that a friction stir end position is provided in the tab material, and the welding step and the repairing step are performed at least on the plasticized region adjacent to the tab material.

  According to such a joining method, since the friction stir is performed while the weld metal is pushed into the oxide film wound inside the plasticized region by the friction stir, the joining defect can be reliably sealed. Also, by performing build-up welding before performing the repair process, and forming the weld metal on the surface of the plasticized region, the metal will be replenished to the groove formed during the main joining process, The generation of grooves during the repair process can be suppressed.

  Further, when the rotating tool used in the main joining process is rotated to the right, the welding process and the repairing process are performed on the plasticizing region on the right side in the traveling direction of the rotating tool, and the rotation used in the main joining process is performed. When the tool is rotated counterclockwise, it is preferable to perform the welding step and the repairing step on the plasticized region on the left side in the traveling direction of the rotary tool. Thus, work efficiency can be improved by repairing according to the area | region where possibility that a joint defect will generate | occur | produce is high.

  Moreover, it is preferable that this invention performs the said repair process using a rotary tool smaller than the rotary tool used at the said main joining process. According to this joining method, the repair process can be performed smoothly.

  Moreover, it is preferable that this invention includes the temporary joining process of performing friction stirring with respect to the said butt | matching part of the said metal members, before performing the said main joining process. According to this joining method, it is possible to prevent the opening of the metal members when performing the main joining step.

  According to the joining method according to the present invention, it is possible to reliably seal the joining defect formed in the plasticized region and to suppress the generation of grooves formed when repairing.

  The best mode for carrying out the present invention is a method for joining metal members using friction stirrer, which is temporarily joined after performing friction stir as temporary joining to the abutting part between metal members. The joining method which performs the friction stir as the main joining with respect to the butt | matching part of the state which illustrated is illustrated.

[First embodiment]
In 1st embodiment, as shown in FIG. 1, the case where a pair of 1st metal member 1a and 2nd metal member 1b which exhibit flat form are connected linearly is illustrated.
First, the metal member 1 to be joined including the first metal member 1a and the second metal member 1b will be described in detail, and the first tab material 2 and the second tab material used when joining the metal member 1 to be joined. 3 will be described in detail.

  The 1st metal member 1a and the 2nd metal member 1b are metal members which exhibit the plate shape which consists of a substantially equivalent shape. The first metal member 1a and the second metal member 1b are made of a friction-stirring metal material such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, and magnesium alloy. Although there is no restriction | limiting in particular in the shape and dimension of the 1st metal member 1a and the 2nd metal member 1b, The thickness dimension in the butt | matching part J1 formed by abutting the end surface of the 1st metal member 1a and the 2nd metal member 1b is the same It is desirable to make it.

  The 1st tab material 2 and the 2nd tab material 3 are arrange | positioned so that the butt | matching part J1 of the to-be-joined metal member 1 may be pinched | interposed, respectively, are attached to the to-be-joined metal member 1, and to-be-joined metal member The seam (boundary line) appearing on the side surface 14 of 1 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 to-be-joined metal member 1. FIG. Moreover, there is no restriction | limiting in particular also in the shape and dimension of the 1st tab material 2 and the 2nd tab material 3, In this embodiment, the thickness dimension is the same as the thickness dimension of the to-be-joined metal member 1 in the butt | matching part J1. I have to.

  Next, referring to FIG. 2, a rotary tool used for temporary joining (hereinafter referred to as “small rotating tool F”) and a rotating tool used for main joining (hereinafter referred to as “large rotating tool G”) are described in detail. explain.

  A small rotary tool F shown in FIG. 2 (a) is made of a metal material harder than the metal member 1 to be joined, such as tool steel, and projects into a shoulder portion F1 having a cylindrical shape and a lower end surface F11 of the shoulder portion F1. A stirring pin (probe) F2 is provided. The size and shape of the small rotary tool F may be set according to the material and thickness of the metal member 1 to be joined, but at least the large rotary tool G used in the main joining process described later ((b) in FIG. 2). Smaller than reference). This makes it possible to perform temporary bonding with a load smaller than that of the main bonding, so that it is possible to reduce the load applied to the friction stirrer during temporary bonding, and further, the moving speed of the small rotary tool F. Since (feeding speed) can be made higher than the moving speed of the large-sized rotary tool G, the working time and cost required for temporary joining can be reduced.

The lower end surface F11 of the shoulder portion F1 is a portion that plays a role of pressing the plastic fluidized metal and preventing scattering to the surroundings, 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 F1, in this embodiment, is smaller than the outer diameter Y ₁ of the shoulder portion G1 of a large rotating tool G.

The stirring pin F2 hangs down from the center of the lower end surface F11 of the shoulder portion F1, 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 F2. There is no particular limitation on the size of the outer diameter of the stirring pin F2, in the present embodiment, than the maximum outer diameter of the maximum outer diameter of the stirring pin G2 of (upper diameter) X ₂ is large rotating tool G (upper end diameter) Y ₂ It is small, and the minimum outer diameter (bottom diameter) X ₃ is smaller than the minimum outer diameter (bottom diameter) Y ₃ of the stirring pin G2. The length L _A of the stirring pin F2 is desirably smaller than the length L _B of the stirring pin G2 of the large rotary tool G.

  A large rotary tool G shown in FIG. 2B is made of a metal material harder than the metal member 1 to be joined, such as tool steel, and projects into a shoulder portion G1 having a columnar shape and a lower end surface G11 of the shoulder portion G1. It comprises a stirring pin (probe) G2 provided.

  The lower end surface G11 of the shoulder portion G1 is formed in a concave shape like the small rotary tool F. The stirring pin G2 hangs down from the center of the lower end surface G11 of the shoulder portion G1, and is formed into a tapered truncated cone shape in this embodiment. In addition, a stirring blade engraved in a spiral shape is formed on the peripheral surface of the stirring pin G2.

  Hereinafter, the joining method according to the present embodiment will be described in detail. The joining method according to this embodiment includes (1) a preparation step, (2) a first preliminary step, (3) a first main joining step, (4) a first welding step, (5) a first repairing step, (6 ) First transverse repair process, (7) Second preliminary process, (8) Second main joining process, (9) Second welding process, (10) Second repair process, (11) Second transverse repair process It is a waste. The first preliminary process, the first main joining process, the first welding process, the first repair process, and the first transverse repair process are performed from the surface A (see FIG. 1C) side of the metal member 1 to be joined. The second preliminary process, the second main joining process, the second welding process, the second repair process, and the second transverse repair process are performed on the back surface B of the metal member 1 to be joined (see FIG. 1C). It is a process executed from the side.

(1) Preparatory process A preparatory process is demonstrated with reference to FIG. A preparation process is a process of preparing the to-be-joined metal member 1 which should be joined, and the contact member (the 1st tab material 2 and the 2nd tab material 3) in which the start position and completion | finish position of friction stirring are provided, and in this embodiment. A butting step for butting the metal members 1 to be joined, and a tab material arranging step for arranging the first tab material 2 and the second tab material 3 on both sides of the butting portion J1 of the metal member 1 to be joined. ing.

  In the abutting step, as shown in FIG. 1C, the end surface 11 of the second metal member 1b is brought into close contact with the end surface 11 of the first metal member 1a, and the surface 12 of the first metal member 1a and the second metal member The front surface 12 of 1b is flush, and the back surface 13 of the first metal member 1a and the back surface 13 of the second metal member 1b 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 member 1 to be bonded, and the contact surface 21 is made to be the metal member 1 to be bonded. 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 member 1 to be joined. 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 A of the metal member 1 to be joined, and the first tab. The back surface 23 of the material 2 and the back surface 33 of the second tab material 3 are flush with the back surface B of the bonded metal member 1.

  Moreover, in this embodiment, as shown to (a) and (b) of FIG. 1, the corners 2a and 2a (namely, to-be-joined metal) formed with the to-be-joined metal member 1 and the 1st tab material 2 are shown. The joined metal member 1 and the first tab material 2 are joined by welding the corners 2a, 2a) formed by the side surface 14 of the member 1 and the side surface 24 of the first tab material 2, and the joined metal member 1 And the corners 3a, 3a formed by the second tab member 3 (that is, the corners 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. Then, the metal member 1 and the second tab member 3 are joined. 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 member 1 to be joined, the first tab member 2 and the second tab member 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 Step The first preliminary step is a step performed prior to the first main joining step, and in this embodiment, the joining portion J2 between the metal member 1 to be joined and the first tab member 2 is joined. First tab material joining step, temporary joining step for temporarily joining the butted portion J1 of the metal member 1 to be joined, and second tab material for joining the butted portion J3 of the metal member 1 to be joined and the second tab material 3 A joining step and a pilot hole forming step of forming a pilot hole at a friction stirring start position in the first main joining step.

In the first preliminary process of the present embodiment, as shown in FIG. 4, one small rotating tool F is moved so as to form a one-stroke writing movement trajectory (bead), and the butt portions J1, J2, J3 are moved. Then, friction stir is performed continuously. That is, the stirring pin small rotary tool F which is inserted into the start position S _P output friction stir F2 is moved to the end position E _P without disengaging (in see FIG. 2 (b)) to the middle, first tab member joining process The temporary joining step and the second tab material joining step are successively performed. 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 (a) of FIG. 3, it is positioned a small rotary tool F immediately above the start position S _P provided in place of the first tab member 2, followed by being rotated clockwise a small rotary tool F It is lowered to press the stirring pin F2 at the start position S _P and. When the stirring pin F2 comes into contact with the surface 22 of the first tab member 2, the metal around the stirring pin F2 is plastically fluidized by frictional heat, and the stirring pin F2 is moved to the first tab as shown in FIG. Inserted into the material 2.

  When the entire stirring pin F2 enters the first tab member 2 and the entire lower end surface F11 of the shoulder portion F1 comes into contact with the surface 22 of the first tab member 2, as shown in FIG. While rotating, relative movement is made toward the starting point s2 of the first tab material joining step. When the small rotary tool F is moved, the metal around the stirring pin F2 is plastically fluidized at the same time, and the plastic fluidized metal is hardened again at a position away from the stirring pin F2.

  When the small rotary tool F is relatively moved and frictional stirring is continuously performed up to the starting point s2 of the first tab material joining process, the small rotating tool F is moved to the first tab material joining process as it is without detaching the small rotating tool F at the start point s2. .

  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 member 1 to be joined. Specifically, a friction stir route is set on the joint (boundary line) between the metal member 1 to be joined and the first tab member 2, and the small rotating tool F is relatively moved along the route. Friction stirring is performed on J2. In the present embodiment, 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 small rotary tool F to be detached on the way.

  In addition, when the small rotary tool F is rotated to the right, there is a possibility that a fine bonding defect may occur on the left side in the traveling direction of the small rotating tool F. 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 member 1 is positioned. If it does in this way, since it becomes difficult to generate | occur | produce a joining defect on the to-be-joined metal member 1 side, it becomes possible to obtain a high quality joined body.

  Incidentally, when the small rotary tool F is rotated counterclockwise, there is a possibility that a fine bonding defect may occur on the right side in the traveling direction of the small rotating tool F. It is desirable to set the positions of the start point and end point of the first tab material joining step so that the member 1 is positioned. Specifically, although not shown, a starting point is provided at the end point e2 when the small rotating tool F is rotated to the right, and an end point is provided at the starting point s2 when the small rotating tool F is rotated to the right. Just do it.

  In addition, when the stirring pin F2 of the small rotary tool F enters the abutting portion J2, a force for separating the bonded metal member 1 and the first tab material 2 acts, but the bonded metal member 1 and the first tab material 2 are applied. Since the entering corner 2a formed by the above is temporarily joined by welding, no opening is generated between the metal member 1 to be joined and the first tab member 2.

  When the small rotary tool F reaches the end point e2 of the first tab material joining process, the friction stir is continuously performed to the start point s1 of the temporary joining process without terminating the friction stirring at the end point e2, and the process proceeds to the temporary joining process as it is. . That is, friction stirring is continued without detaching the small rotary tool F from the end point e2 of the first tab material joining process to the start point s1 of the temporary joining process, and further, temporary joining is performed without detaching the small rotary tool F at the start point s1. Move to the process. This eliminates the need to remove the small rotary tool F at the end point e2 of the first tab material joining process, and further eliminates the need to insert the small rotary tool F at the start point s1 of the temporary joining process. Therefore, it is possible to improve the efficiency and speed of the preliminary joining work.

  In this 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 small rotary tool F is set to the end point of the first tab material joining process. A movement locus when moving from e2 to the starting point s1 of the temporary joining step is formed on the first tab member 2. If it does in this way, since it becomes difficult to generate | occur | produce a joining defect in the to-be-joined metal member 1 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, obtaining a high quality joined body. Is possible.

  In the temporary joining step, friction agitation is performed on the abutting portion J1 of the metal member 1 to be joined. Specifically, a friction stir route is set on the joint (boundary line) of the metal member 1 to be joined, and the small rotary tool F is relatively moved along the route, so that the entire length of the abutting portion J1 is reached. Friction stirring is performed continuously. In the present embodiment, friction stir is continuously performed from the start point s1 to the end point e1 of the temporary joining step without causing the small rotary tool F to be detached halfway. This eliminates the need for removing the small rotary tool F during the temporary joining process, thereby making it possible to further improve the efficiency and speed of the preliminary joining work.

  When the small rotary tool F reaches the end point e1 of the temporary joining step, the friction stir is not completed at the end point e1 and the friction stir is continuously performed until the start point s3 of the second tab member joining step, and the second tab material joining step is performed as it is. Migrate to That is, friction stirring is continued without detaching the small rotary tool F 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 second without detaching the small rotary tool F at the start point s3. Transition to the tab material joining process. This eliminates the need to remove the small rotary tool F at the end point e1 of the temporary joining process, and further eliminates the need to insert the small rotary tool F at the start point s3 of the second tab material joining process. Further, it is possible to further improve the efficiency and speed of the preliminary joining work.

  In the present 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 small rotary tool F is moved from the end point e1 of the temporary joining step to the first point. A movement locus when moving to the start point s3 of the two tab material joining step is formed in the second tab material 3. If it does in this way, since it becomes difficult to generate | occur | produce a joining defect in the to-be-joined 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, obtaining a high quality joined body. Is possible.

  In the second tab material joining step, friction agitation is performed on the abutting portion J3 between the metal member 1 to be joined and the second tab material 3. Specifically, a friction stir route is set on the joint (boundary line) between the metal member 1 to be joined and the second tab member 3, and the small rotary tool F is relatively moved along the route. Friction stirring is performed on J3. In the present embodiment, 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 small rotary tool F to be detached halfway.

  Since the small rotary tool F is rotated to the right, the positions of the start point s3 and the end point e3 of the second tab material joining process are set so that the metal member 1 to be joined is located on the right side in the traveling direction of the small rotary tool F. To do. If it does in this way, since it becomes difficult to generate | occur | produce a joining defect on the to-be-joined metal member 1 side, it becomes possible to obtain a high quality joined body. By the way, when the small rotary tool F is rotated counterclockwise, the positions of the start and end points of the second tab material joining process are set so that the metal member 1 to be joined is located on the left side in the traveling direction of the small rotary tool F. It is desirable.

  Note that when the stirring pin F2 (see FIG. 2A) of the small rotary tool F enters the abutting portion J3, a force acts to separate the to-be-joined metal member 1 and the second tab member 3 from each other. Since the corner portion 3 a of the metal member 1 and the second tab member 3 is temporarily joined by welding, no opening is generated between the metal member 1 to be joined and the second tab member 3.

When small rotary tool F reaches the end point e3 of the second tab member joining process, carried out 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. In the present embodiment, the end position E _P is provided on the extended line of the joint (boundary line) of the metal member 1 to be bonded that appears on the surface A side of the metal member 1 to be bonded. Incidentally, the end position E _P is also a friction stirring start position S _M1 in the first main joining process described later.

When small rotary tool F reaches the end position E _P, it is detached small rotary tool F is raised while rotating the stirring pin F2 (in see FIG. 2 (a)) from the end position E _P.

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 single bonding step. That is, the pilot hole forming step is a step of forming the pilot hole P1 at a position where the stirring pin G2 of the large rotary tool G 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 G2 of the large rotary tool G. In this embodiment, the stirring pin F2 of the small rotary tool F ((a of FIG. ) See)) is formed by expanding the diameter of the hole H1 formed by a drill (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 seam (boundary line) appearing on the surface A side of the bonded metal member 1 as in the present embodiment.

(3) 1st main joining process A 1st main joining process is a process of joining the butt | matching part J1 of the to-be-joined metal member 1 in earnest. In the first main joining step according to the present embodiment, the large rotating tool G shown in FIG. 2B is used, and from the surface A side of the joined metal member 1 to the abutting portion J1 in a temporarily joined state. Friction stirring is performed.

In the first one bonding step, as shown in (a) ~ (c) of FIG. 5, the stirring pin G2 of the large rotating tool G inserted (press-fitted) into the prepared hole P1 formed in the start position S _M1, inserted The stirring pin G2 is moved to the end position E _M1 without being removed halfway. That is, in the first main joining process, the friction stirring is started from the pilot hole P1, and the friction stirring is continuously performed up to the end position _EM1 . 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. 5 (a), the large rotary tool G is positioned immediately above the pilot hole P1 (start position S _M1 ), and then the large rotary tool G is moved downward while being rotated to the right. Insert the tip of G2 into the pilot hole P1. When the stirring pin G2 enters the pilot hole P1, the peripheral surface (side surface) of the stirring pin G2 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, the agitation pin G2 is press-fitted while pushing the plastic fluidized metal away from the peripheral surface of the agitation pin G2, so that it is possible to reduce the press-fitting resistance in the initial press-fitting stage. Since the stirring pin G2 contacts the hole wall of the pilot hole P1 before the shoulder part G1 of the large rotary tool G contacts the surface 32 of the second tab member 3, frictional heat is generated. Time can be shortened. That is, it is possible to reduce the load on the friction stirrer, and in addition, it is possible to shorten the work time required for the main joining.

  When the entire stirring pin G2 enters the second tab member 3 and the entire lower end surface G11 of the shoulder portion G1 comes into contact with the surface 32 of the second tab member 3, as shown in FIG. While stirring, the large rotary tool G is relatively moved toward one end of the abutting part J1 of the metal member 1 to be joined, and further, the abutting part J3 is traversed to enter the abutting part J1. When the large rotary tool G is moved, the metal around the stirring pin G2 is plastically fluidized in sequence, and at a position away from the stirring pin G2, the plastic fluidized metal is hardened again and is plasticized region W1. (Hereinafter, referred to as “front side plasticization region W1”).

  When there is a possibility that the amount of heat input to the metal member 1 to be joined may be excessive, it is desirable to cool the large rotating tool G by supplying water or the like. In addition, when cooling water enters between the first metal member 1a and the second metal member 1b, an oxide film may be generated on the joint surfaces (end surfaces 11 and 11). Since the joints between the metal members 1 to be bonded are closed by executing the process, it is difficult for cooling water to enter between the metal members 1 to be bonded, and therefore there is no possibility of deteriorating the quality of the bonded portion.

At the abutting portion J1 of the metal member 1 to be bonded, a route for friction stirring is set on the joint of the metal member 1 to be bonded (on the movement locus in the temporary bonding process), and the large rotary tool G is relatively moved along the route. Thus, friction stirring is continuously performed from one end to the other end of the abutting portion J1. When the large rotary tool G is relatively moved to the other end of the abutting portion J1, the abutting portion J2 is traversed while performing frictional stirring, and is relatively moved toward the end position E _M1 as it is.

In the present embodiment, the friction stirring start position S _M1 is set on the extension line of the joint (boundary line) of the metal member 1 to be bonded that appears on the surface A side of the metal member 1 to be bonded. The friction stir route in the joining process can be made straight. If the friction stir route is made straight, the moving distance of the large rotating tool G can be minimized, so that the first main joining process can be performed efficiently, and the amount of wear of the large rotating tool G is further improved. Can be reduced.

When the large rotary tool G reaches the end position E _M1 , as shown in FIG. 5C, the large rotary tool G is raised while rotating to move the stirring pin G <b _> 2 to the end position E _M1 (FIG. 5B). (See below). If the stirring pin G2 is separated upward at the end position E _M1 , a punch hole Q1 having the same shape as the stirring pin G2 is inevitably formed. However, in this embodiment, it is left as it is.

  Here, in the first main joining step, the shoulder portion G1 of the large rotary tool G is pushed into the metal member 1 to be frictionally agitated, so that a groove 50 is formed on the surface A of the metal member 1 to be joined. The

(4) 1st welding process A 1st welding process is a process of welding with respect to the front side plasticization area | region W1 formed in the surface A of the to-be-joined metal member 1 by a 1st main joining process. In the first welding process according to the present embodiment, as shown in FIGS. 6A and 6B, at least the first repair region R1, the second repair region R2, and the third of the front side plasticization region W1. Welding is performed on the repair region R3.

  The first repair region R1 refers to a region in which tunnel defects are formed in the front side plasticized region W1. That is, when the large rotating tool G is rotated to the right, there is a risk that a tunnel defect will occur on the left side of the traveling direction, and when it is rotated to the left, a tunnel defect may be generated on the right side of the traveling direction. In this embodiment in which the large rotary tool G is rotated to the right, the first repair region R1 may be set so as to include at least the upper portion of the front side plasticizing region W1 located on the left side in the traveling direction in plan view.

The second repair region R2 is formed on the oxide film (the side surface 14 of the metal member 1 to be bonded and the contact surface 21 of the first tab member 2) when the large rotary tool G crosses the abutting portion J2 in the front side plasticizing region W1. This refers to the area where the oxide film) has been taken into consideration. That is, when the friction stir end position E _M1 in the main joining step is provided in the first tab member 2 as in the present embodiment, when the large rotary tool G is rotated to the right, the front side plasticity on the right side in the traveling direction thereof. 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 large rotary tool G is rotated to the right, the front side plasticizing region W1 located on the right side in the traveling direction in a plan view among the front side plasticizing regions W1 adjacent to the first tab member 2 is shown. The second repair region R2 may be set so as to include at least the upper part. The distance d ₄ from the joint between the metal member 1 and the first tab member 2 to the edge of the second repair region R2 on the metal member 1 side is the maximum outer diameter Y of the stirring pin G2 of the large rotary tool G. It is desirable to make it larger than ₂ .

The third repair region R3 is formed on the oxide film (the side surface 14 of the metal member 1 to be bonded and the contact surface 31 of the second tab member 3 when the large rotating tool G crosses the abutting portion J3 in the front side plasticizing region W1. This refers to the area where the oxide film) has been taken into consideration. That is, when 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 rotated clockwise a large rotating tool G is 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 large rotary tool G is rotated to the right, among the front side plasticizing regions W1 adjacent to the second tab member 3, the front side plasticizing region W1 located on the left side in the traveling direction in plan view. The third repair region R3 may be set so as to include at least the upper part. The distance d ₅ from the joint between the metal member 1 and the second tab member 3 to the edge of the third repair region R3 on the metal member 1 side is the maximum outer diameter Y of the stirring pin G2 of the large rotary tool G. It is desirable to make it larger than ₂ .

In the first welding process, when the first repair region R1, the second repair region R2, and the third repair region R3 are set, as shown in FIG. 6B, these repair regions are subjected to TIG welding or MIG welding. Overlay welding is performed. That is, as shown in (c) of FIG. 6, the surface A to be joined metal member 1, the surface of the front plasticized region W1 and the bottom surface, consisting of an outer diameter Y ₁ substantially equal to the width of the shoulder portion G1 A groove 50 is formed. Therefore, overlay welding is performed on the bottom surface of the groove 50 (the surface of the front side plasticized region W1). The filler material used in the first welding step preferably has a composition equivalent to that of the metal member 1 to be joined.
In addition, as shown in FIG. 7, let the weld metal formed in 1st repair area | region R1, 2nd repair area | region R2, and 3rd repair area | region R3 be the weld metal T1, the weld metal T2, and the weld metal T3, respectively.

(5) First repairing step The first repairing step is a step of performing frictional stirring on the front side plasticized region W1 and the weld metals T1 to T3 formed on the bonded metal member 1 by the first main joining step. This is performed for the purpose of repairing a joint defect that may be included in the front side plasticized region W1.

  In the first repair process according to the present embodiment, as shown in FIGS. 7 and 8, at least the first repair region R1, the second repair region R2, and the third repair region R3 in the front side plasticized region W1. And friction stir. 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 large rotary tool G. Moreover, the friction stir with respect to 2nd repair area | region R2 and 3rd repair area | region R3 aims at parting the oxide film caught in the front side plasticization area | region W1 when the large sized rotary tool G crosses the butt | matching part J2 or J3. Is to be done.

  In the first repairing process according to the present embodiment, friction stirring is performed using a repairing rotating tool E (see FIG. 7) that is smaller than the large rotating tool G. 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 E is made of a metal material harder than the metal member 1 to be joined, such as tool steel. As shown in FIG. 7, a cylindrical shoulder portion E1 and a lower end surface of the shoulder portion E1 project. And a stirring pin (probe) E2.

In this embodiment, the outer diameter of the shoulder portion E1 is set to about one half of the shoulder portion G1 of the large rotary tool G. The stirring pin E2 hangs down from the lower end surface of the shoulder portion E1, and is formed in a tapered truncated cone shape in the present embodiment. In addition, a stirring blade engraved in a spiral shape is formed on the peripheral surface of the stirring pin E2. Since the joining defect due to the large rotating tool G is often formed in the range from the upper end of the stirring pin G2 to 1/3, the length of the stirring pin E2 of the repair rotating tool E is equal to that of the large rotating tool G. Although it is desirable to set it to 1/3 or more of the length L _B of the pin G2 (see FIG. 2B), if it exceeds 1/2, the plasticized region may spread more than necessary. / 2 or less is desirable. 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 E2, in this embodiment, the maximum outer diameter of the stirring pin G2 of the large sized rotary tool G, respectively. It is smaller than (upper end diameter) _{Y 2} and minimum outer diameter (bottom diameter) _{Y 3.}

In the first repair process, the repair rotary tool E may be detached every time friction stirring for one repair area is completed, or a repair rotary tool E having a different form may be used for each repair area. In this embodiment, as shown in FIG. 8, one repair rotary tool E is moved so as to form a one-stroke writing movement trajectory (bead), and the first repair region R 1, the second repair region R 2, and Friction stirring is continuously performed on the third repair region R3.
That is, a first repairing step according to the present embodiment, is moved to the end position E _R without disengaging the stirring pin E2 of repairing rotating tool E inserted into the starting position S _R of the friction stir halfway. 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, a three in the order of the repair region R3 illustrates a case of performing friction stir, but 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, inserting the stirring pin E2 of repairing rotating tool E to the starting position S _R provided in place of the first tab member 2 (pressed). The lower end surface E11 (see FIG. 7) of the repair rotary tool E is pushed into the weld metal T2, and the pushing amount is set so that the stirring pin E2 reaches the surface plasticizing region W1. At this time, it is preferable to push the lower end surface E11 of the repair rotary tool E into the weld metal T2 so that the lower end surface E11 of the repair rotary tool E comes into contact with the surface of the front plasticizing region W1. Accordingly, it is possible to ensure the indentation pressure (pressing force) when performing frictional stirring, and to form the surface of the plasticized region formed by the first repair process and the surface of the front side plasticized region W1 flush with each other. Then, the rotating tool E for repair is relatively moved to perform friction stirring on the second repair region R2.

  When friction stir is performed while the weld metal T2 is being pushed into the second repair region R2, the oxide film on the side surface 14 of the metal member 1 to be bonded and the contact surface 21 of the first tab member 2 becomes the front side plasticization region W1. Even when it is caught, the oxide film can be reliably divided, so that it is difficult for a bonding defect to occur even in the front side plasticized region W1 adjacent to the first tab member 2. If the second repair region R2 is larger than the region where frictional stirring can be performed with the repairing rotary tool E, the repairing rotary tool E may be U-turned several times while shifting the frictional stirring route.

  When the friction agitation for the second repair region R2 is completed, the repair rotary tool E is moved to the first repair region R1 as it is without being detached, and continuously along the friction agitation route in the first main joining step. Friction stirring is performed. When the friction stir is performed while the weld metal T1 is being pushed into the first repair region R1, even if tunnel defects are continuously formed along the route of the friction stir in the main joining process, this is ensured. Since it becomes possible to divide, it becomes difficult to produce a joint defect.

  When the friction agitation with respect to the first repair region R1 is completed, the repair rotary tool E is moved to the third repair region R3 without being detached, and the friction agitation is performed with respect to the third repair region R3. When the friction stir is performed while pushing the weld metal T3 against the third repair region R3, the oxide film on the side surface 14 of the metal member 1 to be bonded and the contact surface 31 of the second tab member 3 becomes the front-side plasticized region W1. Even when it is caught, the oxide film can be reliably divided, so that a bonding defect is hardly generated even in the front side plasticized region W1 adjacent to the second tab member 3. If the third repair region R3 is larger than the region where frictional stirring can be performed with the repair rotating tool E, the repairing rotating tool E may be U-turned several times while shifting the friction stirring route.

When the friction stir for the third repairing region R3 is finished, move the repairing rotating tool E to the end position E _R, is raised while rotating the repairing rotating tool E and stirring pin E2 (see FIG. 7) to the end position E _Remove from _R.

(6) 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 in the metal member 1 to be joined by the first main joining process. This is to increase the bonding strength.

  In the first transverse repair process according to the present embodiment, as shown in FIG. 9, the repair rotary tool E is moved so as to cross the front plasticization region W1 a plurality of times, so that the front plasticization region W1 is moved. Friction stirring is performed. That is, in the first transverse repair process, a friction stir route is set so as to traverse the front side plasticized 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.

  The friction stir route in the first transverse repair process is that a plurality of plasticization regions (hereinafter referred to as “replasticization regions”) W3, W3,... Formed in the front side plasticization region W1 are in the first main joining step. It sets so that it may mutually space apart on the route (namely, center line of the front side plasticization area | region W1) of friction stirring.

  The friction stir route in the first transverse repair process is provided with a plurality of intersecting routes F12 crossing the front side plasticizing region W1 and a transition route F13 connecting the ends on the same side of the adjacent intersecting routes F12 and F12. ing. 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 this intersection route F12, starting from the transition route F13 set along the friction stir route (joint of the metal member 1 to be joined) in the first main joining process, and from the end point s10 of this transition route F13 And at least a second intersection route F12 set so as to face the opposite side across the front side plasticized region W1.

  The intersection route F12 is a friction stir route set so as to cross the front side plasticization region W1, and is orthogonal to the friction stir route in the first main joining step in the present embodiment. The start point s10 and the end point e10 of the intersection route F12 are located on the side of the front side plasticization region W1, and face each other across the front side plasticization region W1.

The positions of the start point s10 and the end point e10 of the intersection route F12 are preferably set so that the entire repair rotary tool E exits from the front side plasticization region W1, but is more than necessary from the front side plasticization region W1. When the position is set, the moving distance of the repair rotary tool E is increased. Therefore, in the present embodiment, the distance from the start point s10 to the side edge of the front plasticizing region W1 and the end point from the side edge of the front plasticizing region W1. distance to e10 is the outer diameter X ₄ of the shoulder portion E1 of repairing rotating tool E is set to half the equal such a position _(see FIG. 10). That is, (the distance from the start point s10 to end point e10) the length of the cross route F12 is 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 E1. Incidentally, plasticized region width d of ₉ formed by repairing rotating tool E, since substantially equal to the outer diameter X ₄ of the shoulder portion D2, the length of the cross route F12, the width of the front plasticized region W1 This is approximately equal to the value obtained by adding the width d ₉ of the plasticized region formed by the repair rotary tool E to the dimension d ₆ .

Distance d ₇ between the adjacent cross route F12, F12 is the root of the friction stir in the single bonding step (i.e., the center line of the front plasticized region W1) re plasticized region W3, W3, ... are spaced apart from each other on the Set to the size you want. 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 F13 is a friction stir route from the end point e10 of one cross route F12 to the start point s10 of another cross route F12 located on the friction stir end position E _C side from the cross route F12. 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 F13 is desirably set to a position where the plasticized region W4 formed by moving the repair rotary tool E along the transition route F13 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 F12 that is the start point of the transition route F13 and the side edge of the front plasticizing region W1 and the start point of the intersection route F12 that is the end point of the transition route F13. the distance between the side edges of s10 and front plasticized region W1 is because is equal to the half of the plasticized region of width d ₉ which are respectively formed by repairing rotating tool E, plasticized region W4 is necessarily In addition, the side edge of the front side plasticized region W1 comes into contact.

As described above, after setting the routes of the first transverse repairing step, the continuous friction stir from the start position S _C to the end position S _E is relatively moved along the repairing rotating tool E the route. When the first transverse repair process is completed, burrs generated by friction stir in the first main joining process, the first repair process, and the first transverse repair process are removed, and as shown in FIG. Turn over and face B up.

(7) Second preliminary step The second preliminary step is a step performed prior to the second main joining step, and in this embodiment, as shown in FIG. 11, the friction stirring start position in the second main joining step. A pilot hole forming step of forming pilot holes P2 in S _M2 is provided. 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.

(8) 2nd main joining process A 2nd main joining process is a process of joining the butt | matching part J1 of the to-be-joined metal member 1 in earnest. In the second main joining step according to the present embodiment, as shown in FIGS. 11A and 11B, the large rotating tool G used in the first main joining step is used, and the abutting portion J1 is used. Friction stirring is performed from the back surface B side of the bonded metal member 1.

In the second main joining step, the stirring pin G2 of the large rotary tool G is inserted (press-fitted) into the pilot hole P2 (starting position S _M2 ) provided in the second tab member 3, and the inserted stirring pin G2 is removed halfway. Without being moved to the end position E _M2 provided in the first tab member 2. That is, in the second main joining process, the friction stirring is started from the pilot hole P2, and the 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. 11 (a), the large rotary tool G is positioned immediately above the pilot hole P2, and then the large rotary tool G is lowered while rotating clockwise, so that the tip of the stirring pin G2 is positioned at the pilot hole. Insert into P2.

  When the entire stirring pin G2 enters the second tab member 3 and the entire lower end surface G11 of the shoulder portion G1 comes into contact with the surface of the second tab member 3, as shown in FIG. The large rotary tool G is relatively moved toward one end of the abutting portion J1 of the bonded metal member 1 while performing the above. When the large rotating tool G is moved, the metal around the stirring pin G2 is plastically fluidized in sequence, and at a position away from the stirring pin G2, the plastic fluidized metal is hardened again and is plasticized region W2. (Hereinafter referred to as “back side plasticized region W2”).

When reaching one end of the butted portion J1 of the metal member 1 to be joined, the large rotary tool G is relatively moved along the joint of the metal member 1 to be continuously frictionally stirred to the other end of the butted portion J1, and further Then, 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 G2 of the large rotary tool G enters the front side plasticizing region W1 formed in the first main joining process. In this way, 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 G2, so that the joint defects are continuously formed in the deep portion of the front side plasticized region W1. Even if it is formed in this manner, it becomes possible to divide the junction defect and make it discontinuous, and as a result, it is possible to improve the air tightness and water tightness at the joint.

When the large rotary tool G reaches the end position E _M2 , the large rotary tool G is raised while rotating to disengage the stirring pin G2 from the end position E _M2 (see FIG. 11C).
Here, in the second main joining step, the shoulder 51 G1 of the large rotary tool G is pushed into the metal member 1 to be frictionally stirred, so that a groove 51 is formed on the back surface B of the metal member 1 to be joined. The

When using a large rotary tool having a different form in the first main joining step and the second main joining step, for example, as shown in FIGS. 12A and 12B, a large rotation used in the first main joining step. large rotating tools G 'stirring pin G2 of' the sum of the length L _{B ',} to be joined metal member 1 in the butting portion J1 meat used in the stirring pin G2 of the tool G length L _B and the two bonding step It is desirable to set the thickness t or more. Incidentally, the stirring pin G2, 'the length _L B of, L _B' G2 is of course each less than the wall thickness t. If it does in this way, the deep part of the front side plasticization area | region W1 formed at the 1st main joining process will be friction-stirred again by the stirring pin G2 'of the large rotary tool G' used at the 2nd main joining process. 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. As a result, the air tightness and the water tightness in the joint part can be obtained. Can be improved.

Incidentally, more preferably, as shown in FIG. 12 (a) and 12 (b), large rotating tool G, 'stirring pin G2 of, G2' G length of _L B, the L _{B ',} respectively, butting It is desirable to set it to 1/2 or more of the thickness t of the metal member 1 to be joined in the part J1, and it is desirable to set it to 3/4 or less of the thickness t. When the lengths L _B and L _{B ′} of the stirring pins G2 and G2 ′ are set to ½ or more of the wall thickness t, the front side plasticized region W1 and the back side plasticized region W2 are made thicker. Overlap in the center of the direction, 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 stirring pins G2, G2 ' When the lengths L _B and L _{B ′} are set to 3/4 or less of the wall thickness t, a backing material is not required when performing frictional stirring, and thus it is possible to improve work efficiency.

More preferably, the lengths L _B and L _{B ′} of the stirring pins G2 and G2 ′ may be set so as to satisfy the relationship of 1.01 ≦ (L _B + L _{B ′} ) /t≦1.10. If (L _B + L _{B ′} ) / t is set to 1.01 or more, even if there is a dimensional tolerance or the like in the metal member 1 to be bonded, the stir pin G2 ′ is surely subjected to front side plasticity in the second main bonding step. It is possible to enter the conversion area W1. When (L _B + L _{B ′} ) / t is larger than 1.10, each rotary tool becomes larger than necessary and the load applied to the friction stirrer increases, but (L _B + L _{B ′} ) / t If it is 1.10 or less, the load applied to the friction stirrer will be small.

(9) Second welding step The second welding step is a step of performing welding on a predetermined region of the back side plasticized region W2 formed on the back surface B of the metal member 1 to be joined by the second main joining step. The second welding process according to the present embodiment is the same as the first welding process described above except that welding is performed from the back surface B of the metal member 1 to be joined, and thus detailed description thereof is omitted.

(10) Second repairing step The second repairing step is friction stirring on the back side plasticized region W2 formed on the metal member 1 to be joined by the second main joining step and the weld metal formed in the second welding step. This step is performed for the purpose of repairing a bonding defect that may be included in the back side plasticized region W2. Since the second repair process is the same as the first repair process described above except that the friction stir is performed from the back surface B side of the metal member 1 to be joined, detailed description thereof is omitted.

(11) Second transverse repair process The second transverse repair process is a process in which friction agitation is performed on the back side plasticized region W2 formed in the metal member 1 to be joined by the second main joining process. This is to increase the bonding strength. Since the second transverse repair process is the same as the first transverse repair process described above except that the friction stir is performed from the back surface B side of the metal member 1 to be joined, detailed description thereof is omitted.

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

By going through the steps (1) to (11) as described above, friction stir is performed while pushing the weld metals T1, T2, T3 against the joining defects inside the plasticized region W1 formed by the main joining step. As a result, the bonding defects can be reliably sealed.
That is, in this embodiment, since the large-sized rotary tool G is rotated to the right, the friction stir (repair process) is performed on the repair region R1 (welded metal T1) set on the left side in the traveling direction of the front side plasticization region W1. By performing, the tunnel defect formed in the inside of the front side plasticization area | region W1 can be sealed reliably, and the airtightness and watertightness of the to-be-joined metal member 1 can be improved.
Further, by performing friction stir (repair process) on the repair regions R2 and R3 of the front side plasticization region W1, the oxide film formed inside the front side plasticization region W1 is surely sealed, and the metal member to be joined 1 airtightness and watertightness can be enhanced.

  Moreover, since welding is performed before performing the repairing process, and after performing overlay welding on the surface of the front-side plasticized region W1, the generation of grooves generated by the repairing process can be suppressed. That is, since the metal is replenished to the groove 50 formed during the main joining process, the generation of the groove during the repair process can be suppressed. Thereby, the operation | work which shape | molds the surface A of the to-be-joined metal member 1 smoothly can be performed easily. In addition, although illustration is not carried out concretely, the effect equivalent to the surface A side can be acquired also in the back surface B side of the to-be-joined metal member 1. FIG.

  Further, according to the first main joining step and the second main joining step, the front end side of the front side plasticizing region W1 and the back side plasticizing region W2 can be overlapped, so that the water tightness and air tightness of the metal member 1 to be joined are obtained. Can be further enhanced.

  In addition, although the friction stirring route as described above has been described as an example in the friction stirring in the present embodiment, the present invention is not limited to this, and another route may be set. For example, in the above-described transverse repair process, the cross route F12 that is a part of the friction stir route is illustrated as being orthogonal to the friction stir route in the main joining step (see FIG. 9). You may let them cross. By making the intersection route F12 obliquely crossed, the number of direction changes can be reduced, so that the movement of the repair rotary tool E can be further eliminated, and tunnel defects can be more efficiently divided.

[Modification]
In the above-described repair process, friction stir was performed on the first repair region R1, the second repair region R2, and the third repair region R3 (see FIG. 8), but the second repair region R2 and the third repair region. Friction stirring may be performed only on R3.

In this case, as shown in FIG. 13, the second repair region R2 (welded metal T2) or the third repair region set in the plasticizing region formed in the main joining process at each of both ends of the abutting portion J1. The repair rotary tool E ′ may be moved so as to cross R3 (welded metal T3). That is, by moving the repair rotary tool E ′ along the abutting portion J2 at one end of the abutting portion J1, friction stir is performed on the second repair region R2, and the other end of the abutting portion J1 is performed. In the part, the frictional stirring may be performed on the third repair region R3 by moving the repair rotary tool E ′ along the abutting part J3. Specifically, provided the starting position S _R of the friction stir in the first metal member 1a, by moving the second metal member 1b to the headed rotating repairing tools E ', the side edges of the joined metal member 1 What is necessary is just to perform friction stirring with respect to this. Even in this case, since the oxide film wound when the large rotary tool G crosses the abutting portions J2 and J3 is divided, it is possible to obtain a joined body with extremely few joining defects.

In addition, when performing the friction stir along the abutting portion J2, when the repair rotating tool E ′ is rotated to the right, the friction stir route is set so that the first tab member 2 is positioned on the left side in the traveling direction. When set and rotated counterclockwise as shown, the friction stir route is set so that the first tab member 2 is positioned on the right side in the traveling direction. Similarly, when performing frictional stirring along the abutting portion J3, when the repair rotary tool E ′ is rotated to the right as illustrated, the second tab member 3 is positioned on the left side in the traveling direction. When the friction stir route is set and rotated counterclockwise, the friction stir route is set so that the second tab member 3 is positioned on the right side in the traveling direction. In either case, the end position E _R of the friction stir, as vent holes of the stirring pin repairing rotating tool E 'does not remain to be joined metal member 1, the first tab member 2 or the second tab member 3 It is good to provide.

[Second Embodiment]
In the first embodiment described above, the case where the metal members 1 to be joined are joined in a straight line is illustrated, but the above-described method is also applied to the case where the metal members 1 to be joined are joined in an L shape or a T shape. be able to. In addition, below, the case where the to-be-joined metal member 1 is joined in L shape is illustrated.

  Similarly to the bonding method according to the first embodiment, the bonding method according to the second embodiment is (1) a preparation step, (2) a first preliminary step, (3) a first main bonding step, and (4) a first. One welding process, (5) first repair process, (6) first transverse repair process, (7) second preliminary process, (8) second main joining process, (9) second welding process, (10) first It includes two repair steps, (11) a second transverse repair step. Note that the first preliminary process, the first main joining process, the first welding process, the first repair process, and the first transverse repair process are executed from the surface A side of the metal member 1 to be joined, and the second preliminary process. The process, the second main joining process, the second welding process, the second repair process, and the second transverse repair process are executed from the back surface B side of the metal member 1 to be joined.

(1) Preparatory process A preparatory process is demonstrated with reference to FIG. The preparatory process according to the present embodiment includes a butting process in which the first metal member 1a and the second metal member 1b are butted, and a first tab material 2 and a second tab material on both sides of the butting portion J1 of the metal member 1 to be joined. And a tab material arranging step of arranging 3.

  In the abutting step, the first metal member 1a and the second metal member 1b are arranged in an L shape, and the end surface of the second metal member 1b is brought into close contact with the side surface of the first metal member 1a to form the bonded metal member 10. . The surface of the bonded metal member 10 is also referred to as the front surface A, and the back surface is also referred to as the back surface B.

  In the tab material arranging step, the first tab material 2 is arranged on one end side (outside) of the abutting portion J1 of the bonded metal member 10, and the contact surface 21 of the first tab material 2 (see FIG. 14B). Is brought into contact with the outer side surface of the metal member 10 to be joined, and the second tab member 3 is disposed on the other end side of the abutting portion J1, so that the contact surfaces 31, 31 (see FIG. b) is brought into contact with the inner side surface of the metal member 10 to be joined. When the bonded metal members 10 are combined in an L shape, one of the first tab material 2 and the second tab material 3 (the second tab material 3 in the present embodiment) is moved by the bonded metal member 10. It arrange | positions in the formed corner part (corner part formed by the side surface inside the to-be-joined metal member 10).

  Moreover, in this embodiment, the corners 2a and 2a formed by the metal member 10 to be joined and the first tab member 2 are welded to join the metal member 10 and the first tab member 2 to be joined. The corners 3 a and 3 a formed by the metal member 10 and the second tab material 3 are welded to join the metal member 10 to be joined and the second tab material 3.

  When the preparation process is completed, the metal member 10 to be joined, the first tab member 2 and the second tab member 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.

(2) First Preliminary Step The first preliminary step includes a first tab material joining step for joining the abutting portion J2 between the metal member 10 to be joined and the first tab material 2, and a butt portion J1 of the metal member 10 to be joined. A pilot hole is provided at the friction stir starting position in the temporary joining step, the second tab material joining step for joining the butted portion J3 of the metal member 10 to be joined and the second tab material 3, and the first main joining step. And a prepared hole forming step to be formed.

  Even in the first preliminary joining step of the present embodiment, as shown in FIGS. 15A and 15B, the one small rotary tool F is moved so as to form a one-stroke writing movement trajectory (bead), Friction stirring is continuously performed on the abutting portions J1, J2, and J3.

The procedure of friction stirring in the first pre-joining step of this embodiment will be described in more detail.
First, a small rotating tool stirring pin F2 of F is inserted into the start position S _P provided in place of the first tab member 2 while the left rotation starts friction stir small rotary tool F the first tab member joining process Relative movement toward the starting point s2.

  When the small rotary tool F is relatively moved and frictional stirring is continuously performed up to the start point s2 of the first tab material joining process, the process proceeds to the first tab material joining process without removing the small rotary tool F at the start point s2. .

  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 member 10 to be joined. Specifically, a route of friction stirring is set on the joint between the metal member to be bonded 10 and the first tab member 2, and the small rotary tool F is relatively moved along the route, so that the butt portion J2 is moved. And friction stir. In the present embodiment, 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 small rotary tool F to be detached on the way.

  When the small rotary tool F is rotated counterclockwise, there is a possibility that a fine bonding defect may occur on the right side in the traveling direction. Therefore, the metal member 10 to be bonded is located on the left side in the traveling direction of the small rotary tool F. Thus, it is desirable to set the positions of the start point s2 and the end point e2 of the first tab material joining step. If it does in this way, since it becomes difficult to generate | occur | produce a joining defect on the to-be-joined metal member 1 side, it becomes possible to obtain a high quality joined body.

  When the small rotary tool F reaches the end point e2 of the first tab material joining process, the friction stir is continuously performed to the start point s1 of the temporary joining process without terminating the friction stirring at the end point e2, and the process proceeds to the temporary joining process as it is. . 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.

  In the temporary joining step, friction agitation is performed on the abutting portion J1 of the metal member 10 to be joined. Specifically, a friction stir route is set on the joint of the metal member 10 to be joined, and the small rotary tool F is relatively moved along the route, whereby the stir portion J1 is subjected to friction stir. In the present embodiment, the friction stir is continuously performed from the start point s1 to the end point e1 of the temporary joining step without causing the small rotary tool F to be detached on the way.

  When the small rotary tool F reaches the end point e1 of the temporary joining process, the process proceeds to the second tab material joining process as it is. That is, the process proceeds to the second tab material joining step without detaching the small rotary tool F at the end point e1 of the temporary joining step which is also the starting point s3 of the second tab material joining step.

  In the second tab material joining step, friction agitation is performed on the abutting portions J3 and J3 between the metal member to be joined 10 and the second tab material 3. In the present embodiment, since the start point s3 of the second tab material joining step is located in the middle of the abutting portions J3 and J3, it is turned back to the friction stir route from the start point s3 to the end point e3 of the second tab material joining step. By providing the point m3 and moving the small rotating tool F from the starting point s3 to the turning point m3 (see FIG. 15A), the small rotating tool F is moved from the turning point m3 to the end point e3 (FIG. 15). (B)), the friction stir is performed continuously from the start point s3 to the end point e3 of the second tab material joining step. That is, after the small rotary tool F is reciprocated between the start point s3 and the turning point m3, the small rotary tool F is moved from the start point s3 to the end point e3 in the second tab material joining step by moving the small rotary tool F to the end point e3. Stir. The route of friction stirring from the start point s3 to the turning point m3 and the route of friction stirring from the turning point m3 to the end point e3 are set on the joint between the metal member 10 to be joined and the second tab member 3, respectively.

  There is no particular limitation on the positional relationship between the start point s3, the turning point m3, and the end point e3. However, when the small rotary tool F is rotated counterclockwise as in the present embodiment, the friction stir from at least the turning point m3 to the end point e3 is performed. It is desirable to set the positions of the start point s3, the turning point m3, and the end point e3 of the second tab member joining step so that the metal member 10 to be joined is located on the left side in the traveling direction of the small rotary tool F. In this case, between the starting point s3 and the turning point m3, a route for friction stirring is set on the joint between the metal member 10 to be joined and the second tab member 3 in both the forward path and the return path, and small rotation is performed along the route. It is desirable to move the tool F. If it does in this way, between the starting point s3 and the turning point m3, the to-be-joined metal member 10 is located in the right side of the advancing direction of the small rotary tool F, and a joining defect has occurred on the to-be-joined metal member 10 side. However, since the metal member 10 to be joined is positioned on the left side in the traveling direction of the small rotary tool F in the subsequent frictional stirring from the turning point m3 to the end point e3, the above-described joining defect is corrected and high quality is achieved. It becomes possible to obtain the joined body.

  By the way, when the small rotating tool F is rotated to the right, the second tab is arranged so that the metal member 10 to be joined is positioned on the right side in the traveling direction of the small rotating tool F in the friction stirring route from the turning point to the end point. It is desirable to set the positions of the starting point, turning point and end point of the material joining process. Specifically, although illustration is omitted, a turn is provided at the position of the end point e3 when the small rotating tool F is rotated counterclockwise, and the end point is set at the position of the turning point m3 when the small rotating tool F is rotated counterclockwise. What is necessary is just to provide.

As shown in FIG. 15B, when the small rotary tool F reaches the end point e3 of the second tab material joining step, the end position provided on the second tab material 3 without ending the friction stirring at the end point e3. E to _P continuously carry out the friction stir. When small rotary tool F reaches the end position E _P, disengaging the stirring pin F2 from the end position E _P is raised while rotating the small rotary tool F.

  Then, a pilot hole formation process is performed. The pilot hole forming step is a step of forming the pilot hole P1 at the friction stirring start position in the first main joining step. In the prepared hole forming step according to the present embodiment, the hole is formed at the abutting portion J3 between the metal member to be bonded 10 and the second tab member 3.

  The formation method of the pilot hole P1 is not limited. For example, it can be formed by rotating and inserting a known drill (not shown), but in addition, the stirring pin F2 of the small rotary tool F ((a) in FIG. 2) It can also be formed by inserting and removing while rotating a rotating tool that is larger than the agitating pin G2 of the large rotating tool G (see (b) of FIG. 2).

  Further, the position of the pilot hole P1 (that is, the friction stirring start position in the first main joining process) is not limited, and may be formed on the first tab material 2 or the second tab material 3, or the abutting portion J2. However, it may be formed on the extended line of the joint (boundary line) of the metal member 10 to be bonded that appears on the surface A side of the metal member 10 to be bonded as in this embodiment, or although not shown, It is desirable to form it at the end of the joint of the metal member 10 (that is, the end of the abutting portion J1).

When forming a prepared hole P1 on an extension of the seam to be joined metal member 10, as shown in FIG. 16, the end position E _P of the friction stir in the first preliminary step is provided on the extension line, small The punched hole formed when the stirring pin F2 of the rotary tool F is removed may be used as a pilot hole as it is, or the pilot hole may be formed by expanding the diameter of the punched hole with a drill (not shown). In this way, it is possible to omit or simplify the work for preparing the pilot hole, so that the work time can be shortened.

(3) 1st main joining process After the 1st preliminary process is completed, the 1st main joining process which joins butt part J1 of joined metal member 10 in earnest is performed. In the first main joining step according to the present embodiment, the large rotating tool G shown in FIG. 2A is used, and from the surface A side of the metal member 10 to be joined to the abutting portion J1 in a temporarily joined state. Friction stirring is performed.

In the first main joining step, first, as shown in FIG. 17, the stirring pin G2 is inserted into the start position S _M1 (that is, the pilot hole P1 shown in FIG. 15B) while rotating the large rotary tool G counterclockwise. Then, friction stirring is started. In the present embodiment, since the start position S _M1 provided in the butting portion J3 between the bonded metal member 10 and the second tab member 3, when press-fitting the stirring pin G2 of large rotating tools G, plastically fluidized Since a part of the metal flows into a fine gap between the metal member to be joined 10 and the second tab member 3, and the dissipation of the plastic fluidized metal into the gap is reduced, the meat is insufficient. This makes it difficult to cause bonding defects.

  Note that, when the stirring pin G2 of the large rotary tool G is press-fitted into the prepared hole P1, a force for separating the bonded metal member 10 and the second tab material 3 acts, but the bonded metal member 10 and the second tab material. Since the corners 3 a and 3 a formed by 3 are temporarily joined by welding, no openings are generated between the metal member to be joined 10 and the second tab member 3.

When the friction stir is performed up to one end of the abutting portion J1 of the metal member 10 to be joined, the large rotary tool G is entered into the abutting portion J1 as it is, and along the friction agitation route set on the joint of the metal member 10 to be joined. By relatively moving the large rotating tool G, friction stirring is continuously performed from one end to the other end of the abutting portion J1. When the large rotary tool G is relatively moved to the other end of the abutting portion J1, the abutting portion J2 is traversed while performing frictional stirring, and is relatively moved toward the end position E _M1 as it is.

When the large rotary tool G reaches the end position E _M1 , the large rotary tool G is raised while rotating to disengage the stirring pin G2 from the end position E _M1 . Here, in the first main joining step, the shoulder portion G1 of the large rotary tool G is pushed into the metal member 1 to be friction-stirred, so that the groove 50 (FIG. 19) is formed on the surface A of the metal member 1 to be joined. (See (c)) is formed. If the stirring pin G2 is separated upward at the end position E _M1 , a punch hole Q1 having the same shape as the stirring pin G2 is inevitably formed. However, in this embodiment, it is left as it is.

  In the present embodiment, the case where the friction stirring start position in the first main joining step is provided in the abutting portion J3 is illustrated, but the second tab member 3 is provided as shown in FIG. Alternatively, as shown in FIG. 18B, the first tab member 2 may be provided.

(4) 1st welding process A 1st welding process is a process of welding with respect to the front side plasticization area | region W1 formed in the surface A of the to-be-joined metal member 10 by a 1st main joining process. In the first welding step according to the present embodiment, as shown in FIGS. 19A and 19B, at least the first repair region R1 and the second repair region R2 of the front side plasticized region W1. Weld.

  The first repair region R1 refers to a region in which tunnel defects are formed in the front side plasticized region W1. That is, when the large rotating tool G is rotated to the right, there is a risk that a tunnel defect will occur on the left side of the traveling direction, and when it is rotated to the left, a tunnel defect may be generated on the right side of the traveling direction. In the present embodiment in which the large rotary tool G is rotated to the left, the first repair region R1 may be set so as to include at least the upper portion of the front side plasticizing region W1 located on the right side in the traveling direction in plan view.

The second repair region R2 is formed on the oxide film (the side surface 14 of the metal member 10 to be bonded and the contact surface 21 of the first tab member 2) when the large rotary tool G crosses the abutting portion J2 in the front side plasticizing region W1. This refers to the area where the oxide film) has been taken into consideration. That is, when the friction stir end position E _M1 in the main joining step is provided in the first tab member 2 as in the present embodiment, when the large rotary tool G is rotated to the right, the front side plasticity on the right side in the traveling direction thereof. 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 large rotary tool G is rotated counterclockwise, the front side plasticizing region W1 located on the left side in the traveling direction in plan view among the front side plasticizing regions W1 adjacent to the first tab member 2 is shown. The second repair region R2 may be set so as to include at least the upper part.

In the first welding process, when the first repair region R1 and the second repair region R2 are set, as shown in FIG. 19C, overlay welding such as TIG welding or MIG welding is performed on these repair regions. Do. That is, as shown in (c) of FIG. 19, on the surface A of the bonding metal member 1, the surface of the front plasticized region W1 and the bottom surface, consisting of an outer diameter Y ₁ substantially equal to the width of the shoulder portion G1 A groove 50 is formed. Therefore, overlay welding is performed on the bottom surface of the groove 50 (the surface of the front side plasticized region W1). The filler material used in the first welding step preferably has a composition equivalent to that of the metal member 1 to be joined.
As shown in FIG. 19B, the weld metals formed in the first repair region R1 and the second repair region R2, respectively, are referred to as a weld metal T1 and a weld metal T2.

(5) 1st repair process The 1st repair process is a process of carrying out friction stir with respect to front side plasticization field W1 and weld metal T1 and T2 which were formed in to-be-joined metal member 10 by the 1st main joining process, This is performed for the purpose of repairing a bonding defect that may be included in the front side plasticized region W1.

  In the first repair process according to the present embodiment, as shown in FIG. 20, friction stir is performed on at least the first repair region R1 and the second repair region R2 in the front side plasticized region W1. 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 large rotary tool G. Further, the friction agitation with respect to the second repair region R2 is performed for the purpose of dividing the oxide film caught in the front side plasticizing region W1 when the large rotary tool G crosses the abutting portion J2.

  In the first repairing process according to the present embodiment, friction stirring is performed using a repairing rotating tool E (see FIG. 7) that is smaller than the large rotating tool G. If it does in this way, it will become possible to prevent that a plasticization area | region spreads more than necessary. Since the repair rotary tool E is the same as that of the first embodiment, detailed description thereof is omitted.

  In the first repairing process, as shown in FIG. 20, one repairing rotating tool E is moved so as to form a one-stroke writing trajectory (bead), and the first repairing region R1 (welded metal T1) and the first repairing tool are moved. Friction stirring is continuously performed on the second repair region R2 (welded metal T2). In addition, in this embodiment, although the case where friction stirring is performed in the order of 1st repair area | region R1 and 2nd repair area | region R2 is illustrated, it is not the meaning which limits the order of friction stirring.

The friction stir procedure in the first repair process will be described in more detail with reference to FIG.
First, to insert the stirring pin repair rotation tool E to the starting position S _R provided in place of the bonding metal member 1 (press-fit) to the start of friction stir, first repairing region R1 (see FIG. 20) And friction stir. In the present embodiment, the start position S _M1 of the friction stir in the welding process is provided with the starting position S _R in the vicinity _(see FIG. 17), the start position S across the _R end position E _R opposite the turning point on the side M the _R provided, after moved relative toward the folding point M _R a repairing rotating tool E, folded at folding points M _R, then, by relative movement along the butting portion J1 (see FIG. 17), the Friction stirring is performed on the repair region R1 (see FIG. 20). From the start position S _R to the turn-around point M _R by the friction stir, that dividing the oxide film caught when inserting the stirring pin G2 of the large rotating tool G to the starting position S _{M1 (see} FIG. 17) It becomes possible.

  The pushing amount of the repair rotary tool E is set so that the stirring pin E2 (see FIG. 7) reaches the surface plasticization region W1. At this time, it is preferable to push the lower end surface E11 of the repair rotary tool E into the weld metal T1 so that the lower end surface E11 of the repair rotary tool E and the surface of the front side plasticizing region W1 are in contact with each other. Accordingly, it is possible to ensure the indentation pressure (pressing force) when performing frictional stirring, and to form the surface of the plasticized region formed by the first repair process and the surface of the front side plasticized region W1 flush with each other.

  When the friction agitation for the first repair region R1 is completed, the repair rotary tool E is moved to the second repair region R2 without being detached, and the friction agitation is performed on the second repair region R2. If the second repair region R2 is larger than the region where frictional stirring can be performed with the repairing rotary tool E, the repairing rotary tool E may be U-turned several times while shifting the frictional stirring route.

When the second repairing region R2 friction stir is finished for, moving the repairing rotating tool E to the end position E _R, is raised while rotating the repairing rotating tool E disengaging the stirring pin E2 from the end position E _R.

(6) First transverse repair process When the first repair process is completed, the repair rotary tool E is moved so as to cross the front plasticization region W1 a plurality of times, and friction stirring is performed on the front plasticization region W1. Perform the first crossing repair process. Since the first transverse repair process is substantially the same as the first transverse repair process according to the first embodiment, detailed description thereof is omitted.

  When the first transverse repair process is completed, burrs generated by friction stir in the first preliminary joining process, the first main joining process, the first repair process, and the first transverse repair process are removed, and as shown in FIG. The metal member 10 to be joined is turned over, and the back surface B is turned up.

(7) Second Preliminary Step When the metal member to be bonded 10 is turned over, the second preliminary step is executed. Second preliminary step of the present embodiment is provided with a prepared hole forming step of forming a prepared hole in the start position S _M2 friction stir in the two bonding step (not shown).

(8) Second Main Joining Step When the second preliminary step is completed, as shown in FIG. 21, the large rotating tool G used in the first main joining step is rotated counterclockwise, and the metal to be joined to the abutting portion J1. A second main joining step in which friction stirring is performed from the back surface B side of the member 10 is executed. In the present embodiment, the start position S _M2 is set on the abutting portion J3 and on the extension line of the abutting portion J1, and the friction stir is continuously performed to the end position E _M2 on the first tab member 2. Since the procedure of the second main joining step is substantially the same as that of the second main joining step according to the first embodiment, detailed description thereof is omitted.

(9) Second Welding Step When the second main joining step is completed, as shown in FIG. 21, the second side joining step among the back side plasticized regions W2 formed on the back surface B of the metal member 10 to be joined by the second main joining step. Welding is performed on the first repair region R1 and the second repair region R2. Since the second main joining process is the same as the case of the second welding process according to the first embodiment described above, detailed description thereof is omitted.

(10) Second repair process When the second welding process is completed, a second repair process is performed in which friction stir is performed on the weld metals T1 and T2 and the back side plasticized region W2. Since the second repair process is the same as the first repair process described above except that the friction stir is performed from the back surface B side of the metal member 10 to be joined, detailed description thereof is omitted.

(11) Second transverse repair process When the second repair process is completed, a second transverse repair process is performed in which friction stir is performed on the back side plasticized region W2 formed in the metal member 10 to be joined by the second main joining process. To do. The second transverse repair process is the same as the first transverse repair process described above except that the friction stir is performed from the back surface B side of the metal member 10 to be joined, and thus detailed description thereof is omitted.

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

  Through the steps (1) to (11) as described above, it is possible to obtain substantially the same effect as that of the first embodiment, and to cope with a case where a pair of metal members are joined in an L shape. .

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 of FIG. (A) is a side view for demonstrating a small rotation tool, (b) is a side view for demonstrating a large rotation tool. (A) And (b) is a typical side view for demonstrating the condition which inserts a small rotation tool 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. (A) is a top view for demonstrating the area | region which performs friction stirring in the 1st repair process which concerns on 1st embodiment, (b) is the top view which showed the 1st welding process, (c) is It is VV sectional drawing of (b). It is IV-IV sectional drawing of (b) of FIG. 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 VI-VI 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 large sized rotary tool used at a 1st main joining process, (b) is a side view which shows the large sized rotating tool used at a 2nd main joining process. It is a top view for demonstrating the modification of the repair process which concerns on 1st embodiment. It is a figure for demonstrating arrangement | positioning of the metal member which concerns on 2nd embodiment, a 1st tab material, and a 2nd tab material, Comprising: (a) is a perspective view, (b) is a top view. (A) And (b) is a figure for demonstrating the 1st preliminary process which concerns on 2nd embodiment. It is a top view for demonstrating the modification of the 1st preliminary process which concerns on 2nd embodiment. It is a top view for demonstrating the 1st main joining process concerning 2nd embodiment. (A) And (b) is a top view for demonstrating the modification of the 1st main joining process which concerns on 2nd embodiment. (A) is a top view for demonstrating the area | region which performs friction stirring in the 1st repair process which concerns on 2nd embodiment, (b) is the top view which showed the 1st welding process, (c) is It is VII-VII sectional drawing of (b). It is a top view for demonstrating the 1st repair process which concerns on 2nd embodiment. It is sectional drawing for demonstrating the 2nd main joining process which concerns on 2nd embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal member to be joined 1a 1st metal member 1b 2nd metal member 2 1st tab material 3 2nd tab material E Repair rotation tool F Small rotation tool F1 Shoulder part F2 Agitation pin G Large rotation tool G1 Shoulder part G2 Agitation pin J1-J3 Butt part R Repair area T Weld metal W1, W2 Plasticization area

Claims (7)

A main joining step in which friction stir is performed on the abutting portion between the metal members;
A welding step of performing overlay welding on the plasticized region formed in the main joining step;
A repairing step of performing frictional stirring on the weld metal formed by the welding step and the plasticized region,
When the rotating tool used in the main joining process is rotated to the right, the welding process and the repairing process are performed on the plasticized region on the left side in the traveling direction of the rotating tool,
When the rotating tool used in the main joining process is rotated counterclockwise, the welding process and the repairing process are performed on the plasticized region on the right side in the traveling direction of the rotating tool. A main joining step in which friction stir is performed on the abutting portion between the metal members;
A welding step of performing overlay welding on the plasticized region formed in the main joining step;
A repairing step of performing frictional stirring on the weld metal formed by the welding step and the plasticized region,
In the main joining step, a friction stir starting position is provided on a tab member disposed on the side of the abutting portion between the metal members, and at least the plasticizing region adjacent to the tab member is the welding step. And performing the repair step. When the rotating tool used in the main joining process is rotated to the right, the welding process and the repairing process are performed on the plasticized region on the left side in the traveling direction of the rotating tool,
The said welding process and the said repair process are performed with respect to the said plasticization area | region of the advancing direction of the said rotation tool when the rotation tool used at the said main joining process is rotated counterclockwise. Joining method. A main joining step in which friction stir is performed on the abutting portion between the metal members;
A welding step of performing overlay welding on the plasticized region formed in the main joining step;
A repairing step of performing frictional stirring on the weld metal formed by the welding step and the plasticized region,
In the main joining step, a friction stir end position is provided on a tab member arranged on the side of the abutting portion between the metal members, and at least the plasticizing region adjacent to the tab member is the welding step. And performing the repair step. When the rotating tool used in the main joining process is rotated to the right, the welding process and the repairing process are performed on the plasticized region on the right side in the traveling direction of the rotating tool,
The said welding process and the said repair process are performed with respect to the said plasticization area | region on the left side of the advancing direction of the said rotation tool when the rotation tool used at the said main joining process is rotated counterclockwise. Joining method.   The joining method according to claim 1, wherein the repairing step is performed using a rotating tool that is smaller than the rotating tool used in the main joining step.   The joining method according to any one of claims 1 to 6, further comprising a temporary joining step in which friction stir is performed on the abutting portions of the metal members before the main joining step.

Images