JP2009195949A - Manufacturing method of joined structure - Google Patents

Abstract

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

Description

本発明は、摩擦攪拌を利用した接合構造物の製造方法に関する。   The present invention relates to a method for manufacturing a joint structure using friction stirring.

金属部材同士を突き合わせてなる接合構造物の製造方法としては、摩擦攪拌接合（ＦＳＷ＝Friction Stir Welding）を用いた方法が知られている。この摩擦攪拌接合は、回転ツールを回転させつつ金属部材同士の突合部に沿って移動させ、回転ツールと金属部材との摩擦熱により突合部の金属を塑性流動させることで、金属部材同士を固相接合させるものである。なお、回転ツールは、円柱状を呈するショルダ部の下端面に攪拌ピン（プローブ）を突設したものが一般的である。   As a manufacturing method of a joined structure formed by abutting metal members together, a method using friction stir welding (FSW = Friction Stir Welding) is known. In this friction stir welding, the metal members are fixed to each other by causing the metal at the abutting portion to flow plastically by frictional heat between the rotating tool and the metal member by moving the rotating tool along the abutting portion between the metal members while rotating the rotating tool. Phase joining is performed. In general, a rotating tool is provided with a stirring pin (probe) protruding from the lower end surface of a shoulder portion having a cylindrical shape.

ここで、回転ツールの攪拌ピンの長さに対して金属部材の肉厚が大きい場合には、金属部材の厚みに応じて攪拌ピンの長さを大きくすることで、突合部の深さ方向の全長に亘って隙間なく接合することができる。しかしながら、回転ツールは、金属部材内に攪拌ピンを埋没させて高速で回転しながら移動するため、攪拌ピンの長さを大きくすると、摩擦攪拌装置の駆動手段及び攪拌ピンに作用する負荷が増大し、装置の短寿命化を招来するという問題がある。   Here, when the thickness of the metal member is larger than the length of the stirring pin of the rotary tool, by increasing the length of the stirring pin according to the thickness of the metal member, It can join without a gap over the entire length. However, since the rotary tool moves while rotating at a high speed with the stirring pin embedded in the metal member, increasing the length of the stirring pin increases the load acting on the drive means of the friction stirrer and the stirring pin. There is a problem that the life of the apparatus is shortened.

そこで、回転ツールの攪拌ピンの長さに対して金属部材の肉厚が大きい場合には、厚みの異なる段部を備えた一対の金属部材の間に継手部材を介して段階的に摩擦攪拌を行うことで接合構造物を製造する方法が知られている。
前記した従来の製造方法に用いられる金属部材は、図１５に示すように、第一金属部材１１０ａ及び第二金属部材１１０ｂの本体部１０１，１０１の縁部に、本体部１０１よりも肉厚の小さい段部１０２，１０２が形成されている。 Therefore, when the thickness of the metal member is larger than the length of the stirring pin of the rotary tool, frictional stirring is performed stepwise through a joint member between a pair of metal members having step portions having different thicknesses. A method of manufacturing a joined structure by performing the method is known.
As shown in FIG. 15, the metal member used in the above-described conventional manufacturing method is thicker than the main body 101 at the edge of the main body 101, 101 of the first metal member 110a and the second metal member 110b. Small step portions 102 and 102 are formed.

そして、従来の接合構造物の製造方法は、第一金属部材１１０ａ及び第二金属部材１１０ｂの段部１０２，１０２同士を突き合わせる突合工程と、段部１０２，１０２同士の突合部Ｊｄに対して摩擦攪拌を行う段部摩擦攪拌工程と、突合工程で形成された凹部１０３に継手部材Ｕを配置する継手部材配置工程と、第一金属部材１１０ａと継手部材Ｕとの突合部Ｊａ及び第二金属部材１１０ｂと継手部材Ｕとの突合部Ｊｂに対して摩擦攪拌を行う摩擦攪拌工程と、を備えている。この製造方法によれば、金属部材の肉厚が大きい部材であっても金属部材同士を接合することができる。   And the manufacturing method of the conventional junction structure is the butt | matching process which butt | matches step part 102,102 of the 1st metal member 110a and the 2nd metal member 110b, and butt | matching part Jd of step part 102,102. A step friction stirring step for performing friction stirring, a joint member placement step for placing the joint member U in the recess 103 formed in the abutting step, a butt portion Ja between the first metal member 110a and the joint member U, and a second metal A friction agitation step of performing friction agitation on the abutting portion Jb between the member 110b and the joint member U. According to this manufacturing method, even if it is a member with a large thickness of a metal member, metal members can be joined.

特開２００４−３５８５３５号公報（段落００１９、図２参照）JP 2004-358535 A (see paragraph 0019, FIG. 2)

しかしながら、前記した従来の接合構造物の製造方法では、第一金属部材１１０ａ及び第二金属部材１１０ｂと継手部材Ｕとの継ぎ目が接合構造物の側面に露出しており、この継ぎ目は凹部１０３の底面１０３ａと継手部材Ｕの下面Ｕａとの間の未接合部に通じているため、金属部材１１０ａ，１１０ｂの接合部における気密性及び水密性が低下してしまうという問題がある。   However, in the above-described conventional method for manufacturing a joint structure, the joints of the first metal member 110 a and the second metal member 110 b and the joint member U are exposed on the side surfaces of the joint structure, and this joint is formed in the recess 103. Since it leads to the unjoined portion between the bottom surface 103a and the lower surface Ua of the joint member U, there is a problem that the air tightness and water tightness at the joined portions of the metal members 110a and 110b are lowered.

そこで、本発明では、前記した問題を解決し、金属部材同士の接合部における気密性及び水密性を向上させることができる接合構造物の製造方法を提供することを課題とする。   Then, this invention makes it a subject to solve the above-mentioned problem and to provide the manufacturing method of the joining structure which can improve the airtightness and watertightness in the junction part of metal members.

前記課題を解決するため、本発明は、第一金属部材及び第二金属部材の端面同士を突き合わせてなる接合構造物の製造方法であって、第一金属部材と第二金属部材との突合部に対して、接合構造物の表面から摩擦攪拌を行う第一接合工程と、第一金属部材と第二金属部材との突合部に対して、接合構造物の裏面から摩擦攪拌を行う第二接合工程と、接合構造物の側面において、第一金属部材と第二金属部材との突合部に沿って、接合構造物の表面から裏面に亘って凹溝を形成する凹溝形成工程と、凹溝に継手部材を挿入する継手部材挿入工程と、接合構造物と継手部材との突合部に対して、接合構造物の表面から摩擦攪拌を行う第三接合工程と、接合構造物と継手部材との突合部に対して、接合構造物の裏面から摩擦攪拌を行う第四接合工程と、接合構造物と継手部材との突合部において、第三接合工程で形成された塑性化領域と第四接合工程で形成された塑性化領域との間に形成された未塑性化領域に対して、接合構造物の側面から溶接を行う側面溶接工程と、を含んでいることを特徴としている。   In order to solve the above-mentioned problem, the present invention is a method for manufacturing a joined structure in which end faces of a first metal member and a second metal member are butted together, and a butt portion between the first metal member and the second metal member In contrast, the first joining step of performing frictional stirring from the surface of the bonded structure, and the second bonding of performing frictional stirring from the back surface of the bonded structure to the abutting portion between the first metal member and the second metal member A groove forming step of forming a groove from the front surface to the back surface of the bonding structure along the abutting portion between the first metal member and the second metal member on the side surface of the bonding structure; A joint member inserting step of inserting the joint member into the joint member, a third joining step of performing frictional stirring from the surface of the joint structure to the abutting portion between the joint structure and the joint member, and the joint structure and the joint member A fourth joining step in which friction agitation is performed from the back surface of the joint structure to the butt portion. The unplasticized region formed between the plasticized region formed in the third joining step and the plasticized region formed in the fourth joining step at the abutting portion between the joined structure and the joint member. And a side surface welding step of welding from the side surface of the joint structure.

この構成では、接合構造物の表面、裏面及び側面において、接合構造物と継手部材との突合部が接合され、接合構造物と継手部材との継ぎ目全体が閉じられるため、第一金属部材と第二金属部材との接合部における気密性及び水密性を向上させることができる。   In this configuration, the abutting portions of the joint structure and the joint member are joined on the front surface, the back surface, and the side surface of the joint structure, and the entire joint between the joint structure and the joint member is closed. The airtightness and watertightness at the joint with the two metal members can be improved.

前記した接合構造物の製造方法において、凹溝形成工程の後に、第一金属部材と第二金属部材との突合部において、第一接合工程で形成された塑性化領域と第二接合工程で形成された塑性化領域との間に形成された未塑性化領域に対して、凹溝内から溶接を行うように構成することができる。
また、凹溝形成工程の後に、第一金属部材と第二金属部材との突合部において、第一接合工程で形成された塑性化領域と第二接合工程で形成された塑性化領域との間に形成された未塑性化領域に沿って、凹溝内に溝部を形成し、この溝部に溶接金属を充填してもよい。 In the above-described manufacturing method of the bonded structure, after the concave groove forming step, at the abutting portion between the first metal member and the second metal member, the plasticized region formed in the first bonding step and the second bonding step are formed. It can comprise so that welding may be performed from the inside of a ditch | groove with respect to the unplasticized area | region formed between the plasticized area | regions made.
In addition, after the concave groove forming step, at the abutting portion between the first metal member and the second metal member, between the plasticized region formed in the first joining step and the plasticized region formed in the second joining step. A groove portion may be formed in the concave groove along the unplasticized region formed in the step, and the groove portion may be filled with a weld metal.

この構成では、第一金属部材と第二金属部材との突合部に形成された未塑性化領域に対して、凹溝内から溶接が行われた後に、凹溝に継手部材が挿入され、接合構造物と継手部材との突合部に対して側面から溶接が行われる。したがって、接合構造物の側部は肉厚方向において二重に溶接された状態となるため、第一金属部材と第二金属部材との接合部における気密性及び水密性を向上させることができる。
また、未塑性化領域に沿って形成された溝部に溶接金属を充填する構成では、溶接金属の充填作業を容易に行うことができるとともに、未塑性化領域を確実に閉じることができる。 In this configuration, after welding is performed from the inside of the groove to the unplasticized region formed at the abutting portion between the first metal member and the second metal member, the joint member is inserted into the groove and joined. Welding is performed from the side to the abutting portion between the structure and the joint member. Therefore, since the side part of a joining structure will be in the state welded doubly in the thickness direction, the airtightness and watertightness in the junction part of a 1st metal member and a 2nd metal member can be improved.
In the configuration in which the weld metal is filled in the groove formed along the unplasticized region, the welding metal filling operation can be easily performed, and the unplasticized region can be reliably closed.

前記した接合構造物の製造方法において、側面溶接工程では、接合構造物と継手部材との突合部において、第三接合工程で形成された塑性化領域と第四接合工程で形成された塑性化領域との間に形成された未塑性化領域に沿って、接合構造物の側面に溝部を形成し、この溝部に溶接金属を充填してもよい。   In the above-described method for manufacturing a bonded structure, in the side surface welding step, the plasticized region formed in the third bonding step and the plasticized region formed in the fourth bonding step at the abutting portion between the bonded structure and the joint member. A groove portion may be formed on the side surface of the joint structure along the unplasticized region formed between the two and the weld metal.

この構成では、接合構造物と継手部材との突合部に沿って形成された溝部に溶接金属を充填することで、溶接金属の充填作業を容易に行うことができるとともに、未塑性化領域を確実に閉じることができる。   In this configuration, the weld metal can be filled easily by filling the groove formed along the abutting portion between the joint structure and the joint member, and the unplasticized region can be reliably secured. Can be closed.

前記した接合構造物の製造方法において、凹溝内に形成された溝部に充填された溶接金属のうち凹溝の側面から突出した部分を切除することが望ましい。
この構成では、凹溝の側面が平滑に成形され、凹溝の側面と継手部材の外面とを密着させることができるため、接合構造物と継手部材との接合部における気密性及び水密性を向上させることができる。 In the above-described manufacturing method of the joined structure, it is desirable to cut out a portion protruding from the side surface of the groove in the weld metal filled in the groove formed in the groove.
In this configuration, the side surface of the concave groove is formed smoothly, and the side surface of the concave groove and the outer surface of the joint member can be brought into close contact with each other, thereby improving the air tightness and water tightness at the joint portion between the joint structure and the joint member. Can be made.

前記した接合構造物の製造方法において、接合構造物の側面に形成された溝部に充填された溶接金属のうち接合構造物の側面から突出した部分を切除することが望ましい。
この構成では、接合構造物の側面から突出した溶接金属を切除することで、接合構造物の仕上がり面を平滑に成形することができる。 In the above-described method for manufacturing a joint structure, it is desirable to cut away a portion protruding from the side surface of the joint structure of the weld metal filled in the groove formed on the side surface of the joint structure.
In this configuration, the finished surface of the joined structure can be formed smoothly by cutting away the weld metal protruding from the side surface of the joined structure.

本発明の接合構造物の製造方法によれば、接合構造物と継手部材との継ぎ目全体が閉じられるため、第一金属部材と第二金属部材との接合部における気密性及び水密性を向上させることができる。   According to the method for manufacturing a joint structure of the present invention, since the entire joint between the joint structure and the joint member is closed, the airtightness and water tightness at the joint between the first metal member and the second metal member are improved. be able to.

次に、本発明の実施形態について、適宜図面を参照しながら詳細に説明する。
本実施形態の接合構造物の製造方法は、図１に示すように、第一金属部材１ａの端面１１ａ（図２（ａ）参照）と第二金属部材１ｂの端面１１ｂ（図２（ａ）参照）とを突き合わせてなる接合構造物１の製造方法であって、接合構造物１の表面Ａ及び裏面Ｂから摩擦攪拌接合を行った後に、第一側面Ｃ及び第二側面Ｄに形成された凹溝Ｋ１，Ｋ１に継手部材Ｈ，Ｈを挿入して溶接接合を行うものである。 Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 1, the manufacturing method of the bonded structure of the present embodiment includes an end surface 11a of the first metal member 1a (see FIG. 2A) and an end surface 11b of the second metal member 1b (FIG. 2A). 2), and formed on the first side surface C and the second side surface D after performing friction stir welding from the front surface A and the back surface B of the bonded structure 1. The joint members H and H are inserted into the concave grooves K1 and K1 to perform welding joining.

本実施形態の接合構造物の製造方法は、（１）突合工程、（２）第一接合工程、（３）第二接合工程、（４）凹溝形成工程、（５）第一側面溶接工程、（６）継手部材挿入工程、（７）第三接合工程、（８）第四接合工程、（９）第二側面溶接工程を含むものである。以下、各工程について詳細に説明する。なお、本実施形態における上下左右前後は、図１の矢印に従う。   The manufacturing method of the bonded structure of the present embodiment includes (1) a butt process, (2) a first bonding process, (3) a second bonding process, (4) a groove forming process, and (5) a first side surface welding process. , (6) a joint member inserting step, (7) a third joining step, (8) a fourth joining step, and (9) a second side welding step. Hereinafter, each step will be described in detail. Note that the vertical and horizontal directions in the present embodiment follow the arrows in FIG.

（１）突合工程
突合工程は、図２（ａ）及び（ｂ）に示すように、第一金属部材１ａの端面１１ａと第二金属部材１ｂの端面１１ｂとを突き合わせる工程である。
第一金属部材１ａ及び第二金属部材１ｂは、図２（ａ）に示すように、断面視矩形の金属部材であって、略同等の形状となっている。第一金属部材１ａ及び第二金属部材１ｂは、例えば、アルミニウム、アルミニウム合金、銅、銅合金、チタン、チタン合金、マグネシウム、マグネシウム合金など摩擦攪拌可能な金属材料である。 (1) Butting process As shown in FIGS. 2 (a) and 2 (b), the butting process is a process in which the end surface 11a of the first metal member 1a and the end surface 11b of the second metal member 1b are butted.
As shown in FIG. 2A, the first metal member 1a and the second metal member 1b are metal members having a rectangular shape in cross section, and have substantially the same shape. The first metal member 1a and the second metal member 1b are metal materials capable of friction stirring such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, and magnesium alloy.

突合工程では、図２（ｂ）に示すように、第一金属部材１ａの端面１１ａと第二金属部材１ｂの端面１１ｂとを突き合わせるとともに、第一金属部材１ａの表面１２ａと第二金属部材１ｂの表面１２ｂとを面一にし、第一金属部材１ａの裏面１３ａと第二金属部材１ｂの裏面１３ｂとを面一にする。また、第一金属部材１ａの側面１４ａと第二金属部材１ｂの側面１４ｂとを面一にし、第一金属部材１ａの側面１５ａと第二金属部材１ｂの側面１５ｂとを面一にする。そして、第一金属部材１ａの端面１１ａと第二金属部材１ｂの端面１１ａとの突合せ面には、突合部Ｊ１が形成されている。   In the abutting step, as shown in FIG. 2B, the end surface 11a of the first metal member 1a and the end surface 11b of the second metal member 1b are abutted, and the surface 12a of the first metal member 1a and the second metal member The surface 12b of 1b is flush with the back surface 13a of the first metal member 1a and the back surface 13b of the second metal member 1b. Further, the side surface 14a of the first metal member 1a and the side surface 14b of the second metal member 1b are flush with each other, and the side surface 15a of the first metal member 1a and the side surface 15b of the second metal member 1b are flush with each other. And the abutting part J1 is formed in the abutting surface of the end surface 11a of the 1st metal member 1a, and the end surface 11a of the 2nd metal member 1b.

第一金属部材１ａと第二金属部材１ｂとを突き合わせて形成した部材を以下、接合構造物１とする。また、図２（ｂ）における接合構造物１の上面を表面Ａ、下面を裏面Ｂとし、接合構造物１のうち、第一金属部材１ａの側面１４ａと第二金属部材１ｂの側面１４ｂとで構成される面を第一側面Ｃとする。また、接合構造物１のうち、第一金属部材１ａの側面１５ａと第二金属部材１ｂの側面１５ｂとで構成される面を第二側面Ｄとする。
なお、第一金属部材１ａ及び第二金属部材１ｂの形状・寸法は特に制限はないが、少なくとも突合部Ｊ１における厚さ寸法を同一にすることが望ましい。 A member formed by abutting the first metal member 1a and the second metal member 1b is hereinafter referred to as a joined structure 1. Moreover, the upper surface of the joining structure 1 in FIG.2 (b) is made into the surface A and the lower surface is made into the back surface B, and among the joining structures 1, it is the side surface 14a of the 1st metal member 1a, and the side surface 14b of the 2nd metal member 1b. A surface to be configured is referred to as a first side surface C. Moreover, let the surface comprised by the side surface 15a of the 1st metal member 1a and the side surface 15b of the 2nd metal member 1b among the joining structures 1 be the 2nd side surface D. FIG.
The shape and dimensions of the first metal member 1a and the second metal member 1b are not particularly limited, but it is desirable that at least the thickness dimensions at the abutting portion J1 be the same.

（２）第一接合工程
第一接合工程は、図６に示すように、第一金属部材１ａと第二金属部材１ｂとの突合部Ｊ１に対して、接合構造物１の表面Ａから回転ツールＧ（図４参照）を用いて摩擦攪拌接合を行う工程である。
第一接合工程は、接合構造物１にタブ材２，３を配置するタブ材配置工程（図３参照）と、第一金属部材１ａと第二金属部材１ｂとの突合部Ｊ１に対して表面Ａから摩擦攪拌を行う本接合工程（図６参照）と、を含むものである。 (2) First Joining Step As shown in FIG. 6, the first joining step is a rotating tool from the surface A of the joined structure 1 to the abutting portion J1 between the first metal member 1a and the second metal member 1b. This is a step of performing friction stir welding using G (see FIG. 4).
The first joining step is a tab material arranging step (see FIG. 3) in which the tab materials 2 and 3 are arranged on the joining structure 1, and the surface with respect to the abutting portion J1 between the first metal member 1a and the second metal member 1b And a main joining step (see FIG. 6) in which friction stirring is performed from A.

タブ材配置工程は、図３に示すように、接合構造物１の接合部の左右両側に一対のタブ材２，３を配置する工程である。このタブ材２，３は、後記する摩擦攪拌工程において、回転ツールＧ（図４参照）を押圧させる開始位置、及び回転ツールＧを離脱させる終了位置を設定するものである。   As shown in FIG. 3, the tab material arranging step is a step of arranging a pair of tab materials 2 and 3 on both the left and right sides of the joint portion of the joint structure 1. The tab members 2 and 3 set a starting position for pressing the rotating tool G (see FIG. 4) and an ending position for releasing the rotating tool G in a friction stirring process described later.

第一タブ材２及び第二タブ材３は、直方体の金属部材であり、本実施形態では接合構造物１と同等の素材を用いている。第一タブ材２及び第二タブ材３の表面及び裏面は、接合構造物１の表面Ａ及び裏面Ｂと面一に形成されている。
第一タブ材２は、接合構造物１の第一側面Ｃに当接して配置され、第二タブ材３は、接合構造物１の第二側面Ｄに当接して配置される。
第一タブ材２及び第二タブ材３と接合構造物１とは、それぞれ入り隅部において溶接により仮接合されている。 The 1st tab material 2 and the 2nd tab material 3 are rectangular parallelepiped metal members, and the raw material equivalent to the joining structure 1 is used in this embodiment. The front surface and the back surface of the first tab material 2 and the second tab material 3 are formed flush with the front surface A and the back surface B of the bonded structure 1.
The first tab member 2 is disposed in contact with the first side surface C of the bonded structure 1, and the second tab material 3 is disposed in contact with the second side surface D of the bonded structure 1.
The 1st tab material 2 and the 2nd tab material 3, and the joining structure 1 are each temporarily joined by welding in a corner.

図４に示す回転ツールＧは、工具鋼など接合構造物１よりも硬質の金属材料からなり、円柱状を呈するショルダ部Ｇ１と、このショルダ部Ｇ１の下端面Ｇ１１に突設された攪拌ピン（プローブ）Ｇ２とを備えている。回転ツールＧの寸法・形状は、接合構造物１の材質や厚さ等に応じて設定されている。
ショルダ部Ｇ１の下端面Ｇ１１は、塑性流動化した金属を押えて周囲への飛散を防止する役割を担う部位であり、本実施形態では凹面状に成形されている。
攪拌ピンＧ２は、ショルダ部Ｇ１の下端面Ｇ１１の中央から垂下しており、本実施形態では、先細りの円錐台状に成形されている。また、攪拌ピンＧ２の周面には、螺旋状に刻設された攪拌翼が形成されている。 The rotary tool G shown in FIG. 4 is made of a metal material harder than the joining structure 1 such as tool steel, and has a shoulder part G1 that has a columnar shape, and a stirring pin that protrudes from a lower end surface G11 of the shoulder part G1 ( Probe) G2. The dimensions and shape of the rotary tool G are set according to the material and thickness of the joined structure 1.
The lower end face G11 of the shoulder part G1 is a part that plays a role of preventing the scattering to the periphery by pressing the plastic fluidized metal, and is formed in a concave shape in this embodiment.
The stirring pin G2 hangs down from the center of the lower end surface G11 of the shoulder portion G1, and is formed into a tapered truncated cone shape in this embodiment. In addition, a stirring blade engraved in a spiral shape is formed on the peripheral surface of the stirring pin G2.

本接合工程は、図６に示すように、摩擦攪拌の開始位置Ｐ１に挿入した回転ツールＧの攪拌ピンＧ２を、途中で離脱させることなく終了位置Ｐ２まで移動させて、突合部Ｊ１の摩擦攪拌を行う工程である。   As shown in FIG. 6, in this joining step, the stirring pin G2 of the rotary tool G inserted at the friction stirring start position P1 is moved to the end position P2 without being removed halfway, and the friction stirring of the butt portion J1 is performed. It is a process of performing.

まず、図５（ａ）に示すように、第一タブ材２の適所に設けた開始位置Ｐ１の直上に回転ツールＧを位置させ、続いて、回転ツールＧを回転させつつ下降させて攪拌ピンＧ２を開始位置Ｐ１に押し付ける。
回転ツールＧの回転速度は、攪拌ピンＧ２の寸法・形状、摩擦攪拌される接合構造物１等の材質や肉厚等に応じて設定されている。 First, as shown in FIG. 5 (a), the rotary tool G is positioned immediately above the start position P1 provided at an appropriate position on the first tab member 2, and then the rotary tool G is lowered while rotating to agitation pin. G2 is pressed against the start position P1.
The rotational speed of the rotary tool G is set according to the size and shape of the stirring pin G2, the material of the joint structure 1 to be frictionally stirred, the thickness, and the like.

攪拌ピンＧ２が第一タブ材２の表面に接触すると、摩擦熱によって攪拌ピンＧ２の周囲にある金属が塑性流動化し、図５（ｂ）に示すように、攪拌ピンＧ２が第一タブ材２に挿入される。
なお、回転ツールＧの挿入予定位置に予め下穴を形成した場合には、回転ツールＧを押し込む際の圧入抵抗を低減することができ、摩擦攪拌接合の精度を高めるとともに、迅速に接合作業を行うことができる。 When the stirring pin G2 comes into contact with the surface of the first tab member 2, the metal around the stirring pin G2 is plastically fluidized by frictional heat, and the stirring pin G2 is moved to the first tab member 2 as shown in FIG. Inserted into.
In addition, when a pilot hole is formed in advance at the position where the rotary tool G is to be inserted, the press-fitting resistance when the rotary tool G is pushed in can be reduced, and the accuracy of friction stir welding can be increased and the joining operation can be performed quickly. It can be carried out.

攪拌ピンＧ２全体が第一タブ材２に入り込み、かつ、ショルダ部Ｇ１の下端面Ｇ１１の全面が第一タブ材２の表面に接触したら、図６に示すように、回転ツールＧを回転させつつ突合部Ｊ１に向けて移動させる。
回転ツールＧの移動速度（送り速度）は、攪拌ピンＧ２の寸法・形状、摩擦攪拌される接合構造物１等の材質や肉厚等に応じて設定されている。
回転ツールＧを移動させると、その攪拌ピンＧ２の周囲にある金属が順次塑性流動化するとともに、攪拌ピンＧ２から離れた位置では、塑性流動化していた金属が再び硬化して塑性化領域Ｗ１が形成される（図５（ｂ）参照）。 When the entire stirring pin G2 enters the first tab member 2 and the entire lower end surface G11 of the shoulder portion G1 contacts the surface of the first tab member 2, the rotating tool G is rotated as shown in FIG. Move toward the abutting portion J1.
The moving speed (feeding speed) of the rotary tool G is set in accordance with the size and shape of the stirring pin G2, the material and thickness of the joined structure 1 to be frictionally stirred, and the like.
When the rotary tool G is moved, the metal around the stirring pin G2 is plastically fluidized in sequence, and at the position away from the stirring pin G2, the plastic fluidized metal is hardened again and the plasticized region W1 is formed. It is formed (see FIG. 5B).

本接合工程では、開始位置Ｐ１から第一金属部材１ａと第二金属部材１ｂとの継ぎ目（境界線）上に設定したルートに沿って、回転ツールＧを連続して移動させることで、第一金属部材１ａと第二金属部材１ｂとの突合部Ｊ１に対して摩擦攪拌を行う。   In the main joining step, the rotating tool G is continuously moved along the route set on the joint (boundary line) between the first metal member 1a and the second metal member 1b from the start position P1, thereby Friction stirring is performed on the abutting portion J1 between the metal member 1a and the second metal member 1b.

そして、回転ツールＧが突合部Ｊ１を通過し、第二タブ材３の適所に設けた終了位置Ｐ２に達したら、回転ツールＧを回転させつつ上昇させて攪拌ピンＧ２を終了位置Ｐ２から離脱させる。これにより、接合構造物１の表面Ａ側の摩擦攪拌接合が完了する。   Then, when the rotary tool G passes through the abutting portion J1 and reaches the end position P2 provided at an appropriate position of the second tab member 3, the rotary tool G is raised while rotating to disengage the stirring pin G2 from the end position P2. . Thereby, the friction stir welding on the surface A side of the bonded structure 1 is completed.

なお、本実施形態では、第一タブ材２に開始位置Ｐ１を設け、第二タブ材３に終了位置Ｐ２設けているが、第二タブ材３に開始位置Ｐ１を設け、第一タブ材２に終了位置Ｐ２を設けてもよい。   In the present embodiment, the first tab material 2 is provided with the start position P1 and the second tab material 3 is provided with the end position P2. However, the second tab material 3 is provided with the start position P1 and the first tab material 2 is provided. May be provided with an end position P2.

（３）第二接合工程
第二接合工程は、図７に示すように、第一金属部材１ａと第二金属部材１ｂとの突合部Ｊ１に対して、接合構造物１の裏面Ｂから摩擦攪拌接合を行う工程である。
第二接合工程では、第一接合工程が終了したら、接合構造物１を図示せぬ摩擦攪拌装置から一旦取り外し、裏面Ｂを上方に向けて再度固定する。
第二接合工程は、タブ材配置工程が含まれないこと以外は、前記した第一接合工程と同等であるため、その詳細な説明は省略する。
なお、第二接合工程で形成された塑性化領域を塑性化領域Ｗ２とする。また、第二接合工程が終了したら、接合構造物１からタブ材２，３を切削して除去する。 (3) 2nd joining process A 2nd joining process is friction stirring from the back surface B of the joining structure 1 with respect to the abutting part J1 of the 1st metal member 1a and the 2nd metal member 1b, as shown in FIG. This is a process of joining.
In the second joining step, when the first joining step is completed, the joining structure 1 is once removed from a friction stirrer (not shown) and fixed again with the back surface B facing upward.
Since the second joining step is the same as the first joining step described above except that the tab material arranging step is not included, detailed description thereof is omitted.
In addition, the plasticization area | region formed at the 2nd joining process is made into the plasticization area | region W2. When the second joining process is completed, the tab members 2 and 3 are cut from the joined structure 1 and removed.

（４）凹溝形成工程
凹溝形成工程は、図８に示すように、接合構造物１の第一側面Ｃ及び第二側面Ｄにおいて、第一金属部材１ａと第二金属部材１ｂとの突合部Ｊ１に沿って凹溝Ｋ１，Ｋ１を形成する工程である。本実施形態では、公知のエンドミル等の切削工具を用いて、一定の幅及び深さで表面Ａから裏面Ｂに亘って連続して凹溝Ｋ１，Ｋ１を形成している。また、本実施形態では、両側の凹溝Ｋ１，Ｋ１の間に残された突合部Ｊ１の幅が、接合構造物１の最大幅の半分程度になるように凹溝Ｋ１の深さを設定している。 (4) Concave groove forming step In the concavity forming step, as shown in FIG. 8, the first metal member 1 a and the second metal member 1 b are abutted on the first side surface C and the second side surface D of the bonded structure 1. This is a step of forming the concave grooves K1, K1 along the portion J1. In this embodiment, the concave grooves K1 and K1 are continuously formed from the front surface A to the back surface B with a constant width and depth using a known cutting tool such as an end mill. In this embodiment, the depth of the groove K1 is set so that the width of the abutting portion J1 remaining between the grooves K1 and K1 on both sides is about half of the maximum width of the bonded structure 1. ing.

（５）第一側面溶接工程
第一側面溶接工程は、第一金属部材１ａと第二金属部材１ｂとの突合部Ｊ１に沿って、両側の凹溝Ｋ１，Ｋ１内に第一溝部Ｋ２を形成する溝部形成工程（図９参照）と、第一溝部Ｋ２に溶接金属を充填する溶接金属充填工程（図１０参照）と、を含むものである。 (5) 1st side surface welding process The 1st side surface welding process forms the 1st groove part K2 in the concave groove K1, K1 of both sides along the abutting part J1 of the 1st metal member 1a and the 2nd metal member 1b. And a weld metal filling step (see FIG. 10) for filling the first groove portion K2 with a weld metal.

溝部形成工程では、図９に示すように、両側の凹溝Ｋ１，Ｋ１内の側面に露出した突合部Ｊ１に沿って、凹状の第一溝部Ｋ２を形成する。本実施形態では、公知のエンドミル等の切削工具を用いて、一定の幅及び深さで表面Ａから裏面Ｂに亘って連続して第一溝部Ｋ２を形成している。
第一溝部Ｋ２の溝幅は限定されるものではないが、本実施形態では塑性化領域Ｗ１，Ｗ２の幅よりも小さい溝幅に設定されている。なお、塑性化領域Ｗ１，Ｗ２に空洞欠陥が形成される虞がある場合には、空洞欠陥を含むように第一溝部Ｋ２内の溝幅を設定することが望ましい。 In the groove forming step, as shown in FIG. 9, a concave first groove K2 is formed along the abutting portion J1 exposed on the side surfaces of the concave grooves K1, K1 on both sides. In the present embodiment, the first groove K2 is continuously formed from the front surface A to the back surface B with a constant width and depth using a known cutting tool such as an end mill.
Although the groove width of the first groove portion K2 is not limited, in this embodiment, the groove width is set to be smaller than the width of the plasticized regions W1, W2. In addition, when there exists a possibility that a cavity defect may be formed in plasticization area | region W1, W2, it is desirable to set the groove width in the 1st groove part K2 so that a cavity defect may be included.

溶接金属充填工程では、図１０に示すように、第一溝部Ｋ２にＭＩＧ溶接等の肉盛溶接を行うことで、第一溝部Ｋ２に溶接金属Ｌ１を充填する。これにより、表面Ａ側の塑性化領域Ｗ１と裏面Ｂ側の塑性化領域Ｗ２との間に形成された未塑性化領域が閉じられる。また、第一溝部Ｋ２内に空洞欠陥が含まれる場合には、その空洞欠陥が溶接金属Ｌ１によって閉塞される。
なお、溶接金属充填工程は、ＭＩＧ溶接に限定するものではなく、他の公知の溶接を行ってもよい。また、溶接材料は、接合構造物１と異なっていてもよいが、本実施形態では同一の材料を用いている。
また、第一溝部Ｋ２に溶接金属Ｌ１を充填した後に、第一溝部Ｋ２に充填された溶接金属Ｌ１のうち凹溝Ｋ１内の側面から突出している部分を切除する。 In the weld metal filling step, as shown in FIG. 10, the first groove K2 is filled with the weld metal L1 by performing overlay welding such as MIG welding in the first groove K2. Thus, the unplasticized region formed between the plasticized region W1 on the front surface A side and the plasticized region W2 on the back surface B side is closed. Moreover, when a cavity defect is contained in the 1st groove part K2, the cavity defect is obstruct | occluded with the weld metal L1.
Note that the weld metal filling step is not limited to MIG welding, and other known welding may be performed. Moreover, although the welding material may differ from the joining structure 1, the same material is used in this embodiment.
In addition, after filling the first groove K2 with the weld metal L1, a portion of the weld metal L1 filled in the first groove K2 that protrudes from the side surface in the groove K1 is cut out.

（６）継手部材挿入工程
継手部材挿入工程は、図１１に示すように、両側の凹溝Ｋ１，Ｋ１に継手部材Ｈを挿入する工程である。
継手部材Ｈは、直方体の金属部材であり、その上下高さ寸法、左右幅寸法、前後幅寸法を、凹溝Ｋ１の各寸法と同一にしている。本実施形態では、接合構造物１と同一組成の金属材料で継手部材Ｈを形成しているが、摩擦攪拌可能な金属材料であればよい。
第一側面Ｃ側の凹溝Ｋ１に挿入された継手部材Ｈでは、表面（上面）と接合構造物１の表面Ａとを面一にし、側面と接合構造物１の側面Ｃとを面一にし、裏面（下面）と接合構造物１の裏面Ｂとを面一にする。
同様に、第二側面Ｄ側の凹溝Ｋ１に挿入された継手部材Ｈでは、表面（上面）と接合構造物１の表面Ａとを面一にし、側面と接合構造物１の側面Ｄとを面一にし、裏面（下面）と接合構造物１の裏面Ｂとを面一にする。 (6) Joint member insertion step The joint member insertion step is a step of inserting the joint member H into the concave grooves K1, K1 on both sides, as shown in FIG.
The joint member H is a rectangular parallelepiped metal member, and the vertical height dimension, the horizontal width dimension, and the front-rear width dimension thereof are the same as the dimensions of the concave groove K1. In the present embodiment, the joint member H is formed of a metal material having the same composition as the bonded structure 1, but any metal material that can be frictionally stirred may be used.
In the joint member H inserted into the concave groove K1 on the first side surface C side, the surface (upper surface) and the surface A of the joined structure 1 are flush with each other, and the side surface and the side surface C of the joined structure 1 are flush with each other. The back surface (lower surface) and the back surface B of the bonded structure 1 are flush with each other.
Similarly, in the joint member H inserted into the concave groove K1 on the second side surface D side, the surface (upper surface) and the surface A of the bonded structure 1 are flush with each other, and the side surface and the side surface D of the bonded structure 1 are aligned. The back surface (lower surface) and the back surface B of the bonded structure 1 are flush with each other.

（７）第三接合工程
第三接合工程は、図１３に示すように、接合構造物１と各継手部材Ｈ，Ｈとの突合部Ｊ２，Ｊ３に対して、接合構造物１の表面Ａから回転ツールＧ（図４参照）を用いて摩擦攪拌接合を行う工程である。
第三接合工程は、接合構造物１にタブ材４，５を配置するタブ材配置工程（図１２参照）と、接合構造物１と各継手部材Ｈ，Ｈとの突合部Ｊ２，Ｊ３に対して表面Ａから摩擦攪拌を行う本接合工程（図１３参照）と、を含むものである。 (7) Third Joining Process As shown in FIG. 13, the third joining process is performed from the surface A of the joined structure 1 to the abutting portions J2 and J3 between the joined structure 1 and the joint members H and H. This is a step of performing friction stir welding using the rotary tool G (see FIG. 4).
In the third joining step, the tab material arranging step (see FIG. 12) for arranging the tab materials 4 and 5 on the joined structure 1 and the abutting portions J2 and J3 between the joined structure 1 and the joint members H and H are provided. And a main joining step (see FIG. 13) in which friction stirring is performed from the surface A.

タブ材配置工程は、図１２に示すように、接合構造物１の接合部の左右両側に一対のタブ材４，５を配置する工程である。このタブ材４，５は、後記する本接合工程において、回転ツールＧ（図４参照）を押圧させる開始位置Ｐ３，Ｐ５、及び回転ツールＧを離脱させる終了位置Ｐ４，Ｐ６を設定するものである（図１３参照）。   As shown in FIG. 12, the tab material arranging step is a step of arranging a pair of tab materials 4 and 5 on both the left and right sides of the joint portion of the joint structure 1. The tab members 4 and 5 set start positions P3 and P5 for pressing the rotary tool G (see FIG. 4) and end positions P4 and P6 for releasing the rotary tool G in a main joining process described later. (See FIG. 13).

第三タブ材４及び第四タブ材５は、直方体の金属部材であり、本実施形態では接合構造物１と同等の素材を用いている。第三タブ材４及び第四タブ材５の表面及び裏面は、接合構造物１の表面Ａ及び裏面Ｂと面一に形成されている。
第三タブ材４は、接合構造物１の第一側面Ｃに当接して配置され、第四タブ材５は、接合構造物１の第二側面Ｄに当接して配置される。
第三タブ材４及び第四タブ材５と接合構造物１とは、それぞれ入り隅部において溶接により仮接合されている。 The 3rd tab material 4 and the 4th tab material 5 are rectangular parallelepiped metal members, and the raw material equivalent to the joining structure 1 is used in this embodiment. The front surface and the back surface of the third tab material 4 and the fourth tab material 5 are formed flush with the front surface A and the back surface B of the bonded structure 1.
The third tab member 4 is disposed in contact with the first side surface C of the bonded structure 1, and the fourth tab material 5 is disposed in contact with the second side surface D of the bonded structure 1.
The 3rd tab material 4 and the 4th tab material 5, and the joining structure 1 are each temporarily joined by welding in a corner.

本接合工程では、図１３に示すように、第三タブ材４の表面に設定された開始位置Ｐ３に挿入した回転ツールＧ（図４参照）の攪拌ピンＧ２を、接合構造物１と右側の継手部材Ｈとの継ぎ目を通過して、第三タブ材４の表面に設定された終了位置Ｐ４まで移動させることで、接合構造物１と右側の継手部材Ｈとの突合部Ｊ２の摩擦攪拌を行う。
同様に、第四タブ材５の表面に設定された開始位置Ｐ５に挿入した回転ツールＧの攪拌ピンＧ２を、接合構造物１と左側の継手部材Ｈとの継ぎ目を通過して、第四タブ材５の表面に設定された終了位置Ｐ６まで移動させることで、接合構造物１と左側の継手部材Ｈとの突合部Ｊ３の摩擦攪拌を行う。
なお、第三接合工程で行われる摩擦攪拌接合は、第一接合工程及び第二接合工程で行われた摩擦攪拌接合と同等であるため、その詳細な説明は省略する。 In this joining step, as shown in FIG. 13, the stirring pin G2 of the rotary tool G (see FIG. 4) inserted at the start position P3 set on the surface of the third tab member 4 is connected to the joining structure 1 and the right side. By passing through the joint with the joint member H and moving to the end position P4 set on the surface of the third tab member 4, the friction stir of the abutting portion J2 between the joint structure 1 and the right joint member H is performed. Do.
Similarly, the stirring pin G2 of the rotary tool G inserted at the start position P5 set on the surface of the fourth tab member 5 passes through the joint between the joint structure 1 and the left joint member H, and the fourth tab. By moving to the end position P <b> 6 set on the surface of the material 5, the friction stir of the abutting portion J <b> 3 between the joint structure 1 and the left joint member H is performed.
Note that the friction stir welding performed in the third joining step is equivalent to the friction stir welding performed in the first joining step and the second joining step, and thus detailed description thereof is omitted.

（８）第四接合工程
第四接合工程は、図１４に示すように、接合構造物１と各継手部材Ｈ，Ｈとの突合部Ｊ２，Ｊ３に対して、接合構造物１の裏面Ｂから回転ツールＧ（図４参照）を用いて摩擦攪拌を行う工程である。
第四接合工程では、第三接合工程が終了したら、接合構造物１を図示せぬ摩擦攪拌装置から一旦取り外し、裏面Ｂを上方に向けて再度固定する。
第四接合工程は、タブ材配置工程が含まれないこと以外は、前記した第三接合工程と同等であるため、その詳細な説明は省略する。
なお、第四接合工程で形成された塑性化領域を塑性化領域Ｗ４とする。また、第四接合工程が終了したら、接合構造物１からタブ材４，５を切削して除去する。 (8) Fourth Joining Process As shown in FIG. 14, the fourth joining process starts from the back surface B of the joined structure 1 with respect to the abutting portions J2 and J3 between the joined structure 1 and the joint members H and H. This is a step of performing frictional stirring using the rotary tool G (see FIG. 4).
In the fourth joining step, when the third joining step is finished, the joining structure 1 is once removed from a friction stirrer (not shown) and fixed again with the back surface B facing upward.
Since the fourth joining step is the same as the third joining step described above except that the tab material arranging step is not included, detailed description thereof is omitted.
Note that the plasticized region formed in the fourth joining step is referred to as a plasticized region W4. When the fourth joining process is completed, the tab members 4 and 5 are removed from the joined structure 1 by cutting.

（９）第二側面溶接工程
第二側面溶接工程は、接合構造物１の両側面Ｃ，Ｄにおいて、接合構造物１と継手部材Ｈとの突合部Ｊ２，Ｊ３に沿って、第二溝部Ｋ３・・・を形成する溝部形成工程（図１４参照）と、第二溝部Ｋ３に溶接金属を充填する溶接金属充填工程（図１参照）と、を含むものである。 (9) Second side surface welding step In the second side surface welding step, on both side surfaces C and D of the joined structure 1, along the abutting portions J2 and J3 between the joined structure 1 and the joint member H, the second groove portion K3 is provided. And a weld metal filling step (see FIG. 1) for filling the second groove K3 with a weld metal.

溝部形成工程では、図１４に示すように、接合構造物１の両側面Ｃ，Ｄに露出した突合部Ｊ２，Ｊ３に沿って、凹状の第二溝部Ｋ３を形成する。本実施形態では、公知のエンドミル等の切削工具を用いて、一定の幅及び深さで表面Ａから裏面Ｂに亘って連続して第二溝部Ｋ３を形成している。
第二溝部Ｋ３の溝幅は限定されるものではないが、本実施形態では塑性化領域Ｗ３，Ｗ４の幅よりも小さい溝幅に設定されている。なお、塑性化領域Ｗ３，Ｗ４に空洞欠陥が形成される虞がある場合には、空洞欠陥を含むように第二溝部Ｋ３内の溝幅を設定することが望ましい。 In the groove forming step, as shown in FIG. 14, a concave second groove K3 is formed along the abutting portions J2 and J3 exposed on both side surfaces C and D of the bonded structure 1. In the present embodiment, the second groove portion K3 is continuously formed from the front surface A to the back surface B with a constant width and depth using a known cutting tool such as an end mill.
Although the groove width of the second groove portion K3 is not limited, in the present embodiment, the groove width is set to be smaller than the widths of the plasticized regions W3 and W4. In addition, when there exists a possibility that a cavity defect may be formed in plasticization area | region W3, W4, it is desirable to set the groove width in the 2nd groove part K3 so that a cavity defect may be included.

溶接金属充填工程では、図１に示すように、第二溝部Ｋ３にＭＩＧ溶接等の肉盛溶接を行うことで、第二溝部Ｋ３に溶接金属Ｌ２を充填する。これにより、表面Ａ側の塑性化領域Ｗ３と裏面Ｂ側の塑性化領域Ｗ４との間に形成された未塑性化領域が閉じられる。また、第二溝部Ｋ３内に空洞欠陥が含まれる場合には、その空洞欠陥が溶接金属Ｌ２によって閉塞される。
なお、溶接金属充填工程は、ＭＩＧ溶接に限定するものではなく、他の公知の溶接を行ってもよい。また、溶接材料は、接合構造物１と異なっていてもよいが、本実施形態では同一の材料を用いている。
また、第二溝部Ｋ３に溶接金属Ｌ２を充填した後に、第二溝部Ｋ３に充填された溶接金属Ｌ２のうち接合構造物１の側面Ｃ，Ｄから突出している部分を切除する。 In the weld metal filling step, as shown in FIG. 1, the second groove K3 is filled with weld metal L2 by performing overlay welding such as MIG welding. As a result, the unplasticized region formed between the plasticized region W3 on the front surface A side and the plasticized region W4 on the rear surface B side is closed. Moreover, when a cavity defect is contained in the 2nd groove part K3, the cavity defect is obstruct | occluded with the weld metal L2.
Note that the weld metal filling step is not limited to MIG welding, and other known welding may be performed. Moreover, although the welding material may differ from the joining structure 1, the same material is used in this embodiment.
Further, after the second groove K3 is filled with the weld metal L2, portions of the weld metal L2 filled in the second groove K3 that protrude from the side surfaces C and D of the joined structure 1 are cut off.

以上のような各工程により、図１に示すように、第一金属部材１ａの端面１１ａ（図２（ａ）参照）と第二金属部材１ｂの端面１１ｂ（図２（ａ）参照）とが接合された接合構造物１が形成される。   Through the above steps, as shown in FIG. 1, the end surface 11a of the first metal member 1a (see FIG. 2A) and the end surface 11b of the second metal member 1b (see FIG. 2A) are formed. A joined structure 1 is formed.

本実施形態の接合構造物の製造方法によれば、図１に示すように、接合構造物１の表面Ａ、裏面Ｂ及び両側面Ｃ，Ｄにおいて、接合構造物１と各継手部材Ｈ，Ｈとの突合部Ｊ２，Ｊ３が接合され、接合構造物１と各継手部材Ｈ，Ｈとの継ぎ目全体が閉じられるため、第一金属部材１ａと第二金属部材１ｂとの接合部における気密性及び水密性を向上させることができる。   According to the method for manufacturing a bonded structure of the present embodiment, as shown in FIG. 1, the bonded structure 1 and the joint members H, H are provided on the front surface A, the back surface B, and both side surfaces C, D of the bonded structure 1. Are joined together, and the entire joint between the joint structure 1 and each joint member H, H is closed, so that the airtightness at the joint between the first metal member 1a and the second metal member 1b and Water tightness can be improved.

また、第一側面溶接工程において、第一金属部材１ａと第二金属部材１ｂとの突合部Ｊ１に対して、凹溝Ｋ１内から溶接が行われた後に、凹溝Ｋ１に継手部材Ｈが挿入され、第二側面溶接工程において、接合構造物１と継手部材Ｈとの突合部Ｊ２，Ｊ３に対して側面Ｃ，Ｄから溶接が行われる。したがって、接合構造物１の側部は肉厚方向において二重に溶接された状態となるため、第一金属部材１ａと第二金属部材１ｂとの接合部における気密性及び水密性を向上させることができる。
特に、本実施形態のように、突合部Ｊ１の幅が接合構造物１の最大幅の半分程度となるように設定した場合には、接合構造物１の中心部で溶接が行われるため、第一金属部材１ａと第二金属部材１ｂとの接合部における気密性及び水密性を向上させることができる。 Further, in the first side surface welding step, after the welding is performed from the inside of the groove K1 to the abutting portion J1 between the first metal member 1a and the second metal member 1b, the joint member H is inserted into the groove K1. In the second side surface welding step, welding is performed from the side surfaces C and D to the abutting portions J2 and J3 between the joined structure 1 and the joint member H. Therefore, since the side part of the joining structure 1 will be in the state double-welded in the thickness direction, improving the airtightness and watertightness in the junction part of the 1st metal member 1a and the 2nd metal member 1b. Can do.
In particular, as in this embodiment, when the width of the abutting portion J1 is set to be about half of the maximum width of the bonded structure 1, welding is performed at the center of the bonded structure 1, It is possible to improve the air tightness and water tightness at the joint between the one metal member 1a and the second metal member 1b.

また、第一側面溶接工程では、突合部Ｊ１に沿って形成された第一溝部Ｋ２に溶接金属Ｆ１を充填し、第二側面溶接工程では、突合部Ｊ２，Ｊ３に沿って形成された第二溝部Ｋ３に溶接金属Ｌ２を充填することで、溶接金属Ｌ１，Ｌ２の充填作業を容易に行うことができるとともに、各突合部Ｊ１，Ｊ２，Ｊ３を確実に閉じることができる。   Further, in the first side surface welding step, the first groove K2 formed along the abutting portion J1 is filled with the weld metal F1, and in the second side surface welding step, the second groove formed along the abutting portions J2 and J3. By filling the groove portion K3 with the weld metal L2, the work of filling the weld metals L1 and L2 can be easily performed, and the abutting portions J1, J2, and J3 can be reliably closed.

また、第一側面溶接工程では、第一溝部Ｋ２に充填された溶接金属Ｌ２のうち凹溝Ｋ１の側面から突出した部分を切除することで、凹溝Ｋ１の側面が平滑に成形され、凹溝Ｋ１の側面と継手部材Ｈの外面とを密着させることができるため、接合構造物１と継手部材Ｈとの接合部における気密性及び水密性を向上させることができる。   Further, in the first side surface welding step, the side surface of the concave groove K1 is formed smoothly by cutting away the portion of the weld metal L2 filled in the first groove portion K2 that protrudes from the side surface of the concave groove K1. Since the side surface of K1 and the outer surface of the joint member H can be brought into close contact with each other, the air tightness and water tightness at the joint portion between the joint structure 1 and the joint member H can be improved.

また、第二側面溶接工程では、第二溝部Ｋ３に充填された溶接金属のうち接合構造物１の側面Ｃ，Ｄから突出した部分を切除することで、接合構造物１の仕上がり面を平滑に成形することができる。   Further, in the second side surface welding step, the finished surface of the joint structure 1 is smoothed by cutting out the portions protruding from the side surfaces C and D of the joint structure 1 in the weld metal filled in the second groove K3. Can be molded.

以上、本発明の実施形態について説明したが、本発明は前記実施形態に限定されることなく、その趣旨を逸脱しない範囲で適宜に設計変更が可能である。
例えば、本実施形態の第一側面溶接工程では、図１０に示すように、突合部Ｊ１に沿って、表面Ａから裏面Ｂに亘って第一溝部Ｋ２を形成しているが、表面Ａ側の塑性化領域Ｗ１と裏面Ｂ側の塑性化領域Ｗ２との間に形成された未塑性化領域に対応する部位に溝部を形成し、この溝部に溶接金属を充填することで未塑性化領域を閉じてもよい。 The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the spirit of the present invention.
For example, in the first side surface welding step of the present embodiment, as shown in FIG. 10, the first groove portion K2 is formed from the front surface A to the back surface B along the abutting portion J1, but on the front surface A side. A groove is formed in a portion corresponding to the unplasticized region formed between the plasticized region W1 and the plasticized region W2 on the back surface B side, and the unplasticized region is closed by filling the groove with weld metal. May be.

また、本実施形態の第二側面溶接工程では、図１４に示すように、突合部Ｊ２，Ｊ３に沿って、表面Ａから裏面Ｂに亘って第二溝部Ｋ３を形成しているが、表面Ａ側の塑性化領域Ｗ３と裏面Ｂ側の塑性化領域Ｗ４との間に形成された未塑性化領域に対応する部位に溝部を形成し、この溝部に溶接金属を充填することで未塑性化領域を閉じてもよい。   Further, in the second side surface welding step of the present embodiment, as shown in FIG. 14, the second groove portion K3 is formed from the front surface A to the back surface B along the abutting portions J2 and J3. A groove portion is formed in a portion corresponding to the unplasticized region formed between the plasticizing region W3 on the side B and the plasticizing region W4 on the back surface B side, and the weld metal is filled in the groove portion to thereby form the unplasticized region. May be closed.

また、第一接合工程及び第二接合工程の前に、回転ツールＧ（図４参照）よりも小型の回転ツールを用いて、突合部Ｊ１を摩擦攪拌接合する仮接合工程を行ってもよい。このように、突合部Ｊ１を仮接合することで、突合部Ｊ１に回転ツールＧが押し込まれたときに、目開きが生じるのを防ぐことができる。同様に、第三接合工程の前に、突合部Ｊ２，Ｊ３を仮接合することで、突合部Ｊ２，Ｊ３に回転ツールＧが押し込まれたときに、目開きが生じるのを防ぐことができる。   Moreover, you may perform the temporary joining process of carrying out friction stir welding of the abutting part J1 using a rotary tool smaller than rotating tool G (refer FIG. 4) before a 1st joining process and a 2nd joining process. Thus, by temporarily joining the abutting portion J1, it is possible to prevent the opening of the mesh when the rotary tool G is pushed into the abutting portion J1. Similarly, by temporarily joining the abutting portions J2 and J3 before the third joining step, it is possible to prevent the opening from being generated when the rotary tool G is pushed into the abutting portions J2 and J3.

また、本実施形態の第一接合工程及び第二接合工程では、図６に示すように、接合構造物１の左右両側に一対のタブ材２，３を配置しているが、タブ材は必ずしも設けなくてもよい。このように、タブ材を省略する場合には、第一金属部材１ａと第二金属部材１ｂとの突合部Ｊ１の両端部に摩擦攪拌の開始位置及び終了位置を設定し、第一側面溶接工程において、摩擦攪拌の開始位置及び終了位置が切除されるように第一溝部Ｋ２を形成することが望ましい。
同様に、第三接合工程及び第四接合工程においてもタブ材を設けることなく、突合部Ｊ２，Ｊ３の両端部に摩擦攪拌の開始位置及び終了位置を設定し、第二側面溶接工程において、開始位置及び終了位置が切除されるように第三溝部Ｋ３を形成することが望ましい。 Moreover, in the 1st joining process of this embodiment, and a 2nd joining process, as shown in FIG. 6, although a pair of tab materials 2 and 3 are arrange | positioned at the right-and-left both sides of the joining structure 1, tab material is not necessarily required. It does not have to be provided. Thus, when a tab material is omitted, the start and end positions of friction stirring are set at both ends of the abutting portion J1 between the first metal member 1a and the second metal member 1b, and the first side surface welding step In this case, it is desirable to form the first groove portion K2 so that the start position and the end position of friction stirring are cut off.
Similarly, the start and end positions of friction stirring are set at both ends of the abutting portions J2 and J3 without providing a tab material in the third joining step and the fourth joining step, and the second side welding step is started. It is desirable to form the third groove portion K3 so that the position and the end position are cut off.

また、本実施形態では、図１１に示すように、凹溝Ｋ１の断面形状を矩形に形成し、この凹溝Ｋ１に直方体の継手部材Ｈを挿入しているが、凹溝Ｋ１及び継手部材Ｈの形状は限定されるものではなく、他の形状であってもよい。   Further, in this embodiment, as shown in FIG. 11, the cross-sectional shape of the concave groove K1 is formed in a rectangular shape, and a rectangular parallelepiped joint member H is inserted into the concave groove K1, but the concave groove K1 and the joint member H The shape is not limited and may be other shapes.

本実施形態の製造方法によって接合された接合構造物を示した斜視図である。It is the perspective view which showed the joining structure joined by the manufacturing method of this embodiment. 本実施形態の突合工程を示した図で、（ａ）は第一金属部材と第二金属部材とを突き合わせる前の斜視図、（ｂ）は第一金属部材と第二金属部材とを突き合わせた後の斜視図である。It is the figure which showed the butt | matching process of this embodiment, (a) is a perspective view before matching a 1st metal member and a 2nd metal member, (b) is a butt | matching 1st metal member and a 2nd metal member. FIG. 本実施形態の第一接合工程におけるタブ材配置工程を示した斜視図である。It is the perspective view which showed the tab material arrangement | positioning process in the 1st joining process of this embodiment. 本実施形態の回転ツールを示した側面図である。It is the side view which showed the rotation tool of this embodiment. 本実施形態の回転ツールの使用状態を示した図で、（ａ）は回転ツールをタブ材に当接させたときの側面図、（ｂ）は回転ツールをタブ材に押し込んだときの側面図である。It is the figure which showed the use condition of the rotary tool of this embodiment, (a) is a side view when a rotary tool is made to contact a tab material, (b) is a side view when a rotary tool is pushed into a tab material. It is. 本実施形態の第一接合工程における本接合工程を示した平面図である。It is the top view which showed the main joining process in the 1st joining process of this embodiment. 本実施形態の第二接合工程を終了した後に、タブ材を除去した状態の接合構造物を示した斜視図である。It is the perspective view which showed the joining structure of the state which removed the tab material after finishing the 2nd joining process of this embodiment. 本実施形態の凹溝形成工程を示した斜視図である。It is the perspective view which showed the ditch | groove formation process of this embodiment. 本実施形態の第一側面溶接工程における溝部形成工程を示した斜視図である。It is the perspective view which showed the groove part formation process in the 1st side surface welding process of this embodiment. 本実施形態の第一側面溶接工程における溶接金属充填工程を示した斜視図である。It is the perspective view which showed the weld metal filling process in the 1st side surface welding process of this embodiment. 本実施形態の継手部材挿入工程を示した斜視図である。It is the perspective view which showed the joint member insertion process of this embodiment. 本実施形態の第三接合工程におけるタブ材配置工程を示した斜視図である。It is the perspective view which showed the tab material arrangement | positioning process in the 3rd joining process of this embodiment. 本実施形態の第三接合工程における本接合工程を示した平面図である。It is the top view which showed the main joining process in the 3rd joining process of this embodiment. 本実施形態の第二側面溶接工程における溝部形成工程を示した斜視図である。It is the perspective view which showed the groove part formation process in the 2nd side surface welding process of this embodiment. 従来の接合構造物の製造方法を示した断面図である。It is sectional drawing which showed the manufacturing method of the conventional joining structure.

符号の説明Explanation of symbols

１ 接合構造物
１ａ 第一金属部材
１ｂ 第二金属部材
Ａ 表面
Ｂ 裏面
Ｃ 第一側面
Ｄ 第二側面
Ｈ 継手部材
Ｊ１ 突合部（第一金属部材と第二金属部材）
Ｊ２ 突合部（接合構造物と継手部材）
Ｊ３ 突合部（接合構造物と継手部材）
Ｋ１ 凹溝
Ｋ２ 第一溝部
Ｋ３ 第二溝部
Ｌ１ 溶接金属
Ｌ２ 溶接金属
Ｇ 回転ツール
Ｇ２ 攪拌ピン
Ｗ１ 塑性化領域（表面）
Ｗ２ 塑性化領域（裏面）
Ｗ３ 塑性化領域（表面）
Ｗ４ 塑性化領域（裏面） DESCRIPTION OF SYMBOLS 1 Joining structure 1a 1st metal member 1b 2nd metal member A surface B back surface C 1st side surface D 2nd side surface H joint member J1 butt | matching part (1st metal member and 2nd metal member)
J2 butt (joint structure and joint member)
J3 butt (joint structure and joint member)
K1 Groove K2 First groove K3 Second groove L1 Weld metal L2 Weld metal G Rotary tool G2 Stirring pin W1 Plasticization region (surface)
W2 Plasticization region (back side)
W3 Plasticization region (surface)
W4 Plasticization region (back side)

Claims (6)

第一金属部材及び第二金属部材の端面同士を突き合わせてなる接合構造物の製造方法であって、
前記第一金属部材と前記第二金属部材との突合部に対して、前記接合構造物の表面から摩擦攪拌を行う第一接合工程と、
前記第一金属部材と前記第二金属部材との突合部に対して、前記接合構造物の裏面から摩擦攪拌を行う第二接合工程と、
前記接合構造物の側面において、前記第一金属部材と前記第二金属部材との突合部に沿って、前記接合構造物の表面から裏面に亘って凹溝を形成する凹溝形成工程と、
前記凹溝に継手部材を挿入する継手部材挿入工程と、
前記接合構造物と前記継手部材との突合部に対して、前記接合構造物の表面から摩擦攪拌を行う第三接合工程と、
前記接合構造物と前記継手部材との突合部に対して、前記接合構造物の裏面から摩擦攪拌を行う第四接合工程と、
前記接合構造物と前記継手部材との突合部において、前記第三接合工程で形成された塑性化領域と前記第四接合工程で形成された塑性化領域との間に形成された未塑性化領域に対して、前記接合構造物の側面から溶接を行う側面溶接工程と、を含んでいることを特徴とする接合構造物の製造方法。 It is a manufacturing method of a joined structure formed by abutting end surfaces of a first metal member and a second metal member,
A first joining step in which friction agitation is performed from the surface of the joined structure with respect to the abutting portion between the first metal member and the second metal member;
A second joining step in which friction agitation is performed from the back surface of the joined structure with respect to the abutting portion between the first metal member and the second metal member;
On the side surface of the bonded structure, along the abutting portion between the first metal member and the second metal member, a groove forming step for forming a groove from the surface to the back surface of the bonded structure;
A joint member inserting step of inserting a joint member into the concave groove;
A third joining step in which friction stir is performed from the surface of the joined structure, with respect to the abutting portion between the joined structure and the joint member;
For the abutting portion between the joint structure and the joint member, a fourth joining step of performing frictional stirring from the back surface of the joint structure;
An unplasticized region formed between the plasticized region formed in the third joining step and the plasticized region formed in the fourth joining step at the abutting portion between the joined structure and the joint member. On the other hand, the manufacturing method of the junction structure characterized by including the side surface welding process which welds from the side surface of the said junction structure. 前記凹溝形成工程の後に、前記第一金属部材と前記第二金属部材との突合部において、前記第一接合工程で形成された塑性化領域と前記第二接合工程で形成された塑性化領域との間に形成された未塑性化領域に対して、前記凹溝内から溶接を行うことを特徴とする請求項１に記載の接合構造物の製造方法。   After the concave groove forming step, at the abutting portion between the first metal member and the second metal member, the plasticized region formed in the first joining step and the plasticized region formed in the second joining step The method for manufacturing a joined structure according to claim 1, wherein welding is performed from the inside of the groove to an unplasticized region formed between the two. 前記凹溝形成工程の後に、前記第一金属部材と前記第二金属部材との突合部において、前記第一接合工程で形成された塑性化領域と前記第二接合工程で形成された塑性化領域との間に形成された未塑性化領域に沿って、前記凹溝内に溝部を形成し、この溝部に溶接金属を充填することを特徴とする請求項１に記載の接合構造物の製造方法。   After the concave groove forming step, at the abutting portion between the first metal member and the second metal member, the plasticized region formed in the first joining step and the plasticized region formed in the second joining step 2. The method for manufacturing a joint structure according to claim 1, wherein a groove portion is formed in the concave groove along an unplasticized region formed between and a weld metal in the groove portion. . 前記側面溶接工程では、前記接合構造物と前記継手部材との突合部において、前記第三接合工程で形成された塑性化領域と前記第四接合工程で形成された塑性化領域との間に形成された未塑性化領域に沿って、前記接合構造物の側面に溝部を形成し、この溝部に溶接金属を充填することを特徴とする請求項１から請求項３のいずれか一項に記載の接合構造物の製造方法。   In the side surface welding step, formed at the abutting portion between the joint structure and the joint member between the plasticized region formed in the third joining step and the plasticized region formed in the fourth joining step. The groove part is formed in the side surface of the said joining structure along the made unplasticized area | region, and this groove part is filled with a weld metal, It is any one of Claims 1-3 characterized by the above-mentioned. A method for manufacturing a joined structure. 前記凹溝内に形成された溝部に充填された溶接金属のうち前記凹溝の側面から突出した部分を切除することを特徴とする請求項３に記載の接合構造物の製造方法。   4. The method for manufacturing a joint structure according to claim 3, wherein a portion of the weld metal filled in the groove formed in the groove is protruded from a side surface of the groove. 前記接合構造物の側面に形成された溝部に充填された溶接金属のうち前記接合構造物の側面から突出した部分を切除することを特徴とする請求項４に記載の接合構造物の製造方法。   The method for manufacturing a joined structure according to claim 4, wherein a portion of the weld metal filled in a groove formed on the side surface of the joined structure is projected from the side surface of the joined structure.

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