JP6777020B2 - Joining method - Google Patents

Description

The present invention relates to a joining method for joining metal members by friction stir welding.

Friction stir welding (FSW) is known as a method of joining metal members to each other. Friction stir welding means that the rotating tool is rotated and moved along the butt portion between the metal members, and the metal in the butt portion is plastically flowed by the frictional heat between the rotating tool and the metal member to solidify the metal members. It is to be phase-bonded.

For example, the joining method according to Patent Document 1 is to perform overlay welding on the inner corners of metal members butted in an L-shaped cross section, and then perform friction stir welding from the outer corners of the metal members. ..

Japanese Unexamined Patent Publication No. 2010-284704

However, in the conventional friction stir welding method, since overlay welding is performed on the inner corners of the metal members, there is a problem that contamination occurs in the inner corners.

From such a viewpoint, it is an object of the present invention to provide a joining method capable of preventing contamination from occurring in the inner corners of metal members and improving watertightness and airtightness.

In order to solve such a problem, the present invention prepares a plate-shaped first metal member having a stepped portion formed on the back surface of the end portion, and also prepares a plate-shaped second metal member. The step bottom surface of the step portion of the first metal member and the end surface of the second metal member are abutted to form the first butted portion, and the step side surface of the step portion and the first of the second metal member. In the butt step of forming the second butt portion by abutting the side surfaces, only the stirring pin of the first rotation tool is inserted from the end face of the first metal member and the second side surface of the second metal member, and the first butt is formed. The outer corner friction stir welding step of friction stir welding of the first butt portion by moving relative to the portion, and the first rotation tool by inserting only the stirring pin from the surface side of the first metal member. The rotary tool is relatively moved along the stepped portion to perform the first butt portion friction stir welding step of friction stir welding of the first butt portion and the outer corner friction stirring step or the first butt portion friction stirring step. Previously, the first butt portion includes an outer corner temporary joining step of temporarily attaching a spot to the first butt portion from the end surface of the first metal member and the second side surface side of the second metal member. In the friction stir welding step, the first butt portion is friction stir welded with only the stirring pin of the first rotating tool in contact with only the first metal member or the first metal member and the second metal member. It is characterized by doing.
Further, the present invention includes a preparatory step of preparing a plate-shaped first metal member having a stepped portion formed on the back surface of the end portion and preparing a plate-shaped second metal member, and the above-mentioned first metal member. The step bottom surface of the step portion and the end surface of the second metal member are abutted to form the first abutting portion, and the step side surface of the step portion and the first side surface of the second metal member are abutted to form a second. In the butt step of forming the butt portion, only the stirring pin of the first rotation tool is inserted from the end face of the first metal member and the second side surface of the second metal member, and is relatively moved along the first butt portion. In the outer corner friction stir welding step of friction stir welding the first butt portion, and by inserting only the stirring pin of the first rotation tool from the surface side of the first metal member, the first rotation tool is inserted into the step portion. Before performing the first butt portion friction stir welding step of friction stir welding of the first butt portion and the outer corner friction stirring step or the first butt portion friction stirring step by moving relative to each other along the first metal. The first butt portion friction stir welding includes an inner corner temporary joining step of temporarily attaching a spot to the second butt portion from the inner corner formed on the back surface of the member and the first side surface of the second metal member. In the step, the first butt portion is friction-stir welded with only the stirring pin of the first rotating tool in contact with only the first metal member or the first metal member and the second metal member. It is characterized by.

According to such a joining method, contamination cannot be prevented because the inner corners of the metal members are not welded to each other. Further, since friction stir welding is performed on the first butt portion from two directions, watertightness and airtightness can be improved. Further, since only the stirring pin is inserted, the load applied to the friction stir device can be reduced. Further, according to such a joining method, since the first metal member and the second metal member can be temporarily fixed, it is possible to prevent the opening in the first butt portion friction stirring step and the outer corner friction stirring step.

Further, the present invention includes a preparatory step of preparing a plate-shaped first metal member having a stepped portion formed on the back surface of the end portion and preparing a plate-shaped second metal member, and the above-mentioned first metal member. The step bottom surface of the step portion and the end surface of the second metal member are abutted to form the first abutting portion, and the step side surface of the step portion and the first side surface of the second metal member are abutted to form a second. In the butt step of forming the butt portion, only the stirring pin of the first rotation tool is inserted from the end face of the first metal member and the second side surface side of the second metal member, and the stir welding pin is relatively moved along the first butt portion. The outer corner friction stir welding step of friction stir welding the first butt portion and the stirring pin of the second rotating tool provided with the shoulder portion and the stirring pin are inserted from the surface side of the first metal member, and the shoulder portion is inserted. The first butt portion friction stir welding step of friction stir welding of the first butt portion by relatively moving the second rotation tool along the step portion in a state where the first metal member is in contact with the surface of the first metal member. Before performing the outer corner friction stir welding step or the first butt portion friction stirring step, spot temporary attachment is applied to the first butt portion from the end surface of the first metal member and the second side surface side of the second metal member. In the first butt portion friction stir welding step, the stirring pin of the second rotation tool is used only for the first metal member, or the first metal member and the second metal member. The first butt portion is subjected to friction stir welding in a state of being in contact with the above.
Further, the present invention includes a preparatory step of preparing a plate-shaped first metal member having a stepped portion formed on the back surface of the end portion and preparing a plate-shaped second metal member, and the above-mentioned first metal member. The step bottom surface of the step portion and the end surface of the second metal member are abutted to form the first abutting portion, and the step side surface of the step portion and the first side surface of the second metal member are abutted to form a second. In the butt step of forming the butt portion, only the stirring pin of the first rotation tool is inserted from the end face of the first metal member and the second side surface side of the second metal member, and the stir welding pin is relatively moved along the first butt portion. The outer corner friction stir welding step of friction stir welding the first butt portion and the stirring pin of the second rotating tool provided with the shoulder portion and the stirring pin are inserted from the surface side of the first metal member, and the shoulder portion is inserted. The first butt portion friction stir welding step of friction stir welding of the first butt portion by relatively moving the second rotation tool along the step portion in a state where the first metal member is in contact with the surface of the first metal member. Before performing the outer corner friction stir welding step or the first butt portion friction stirring step, from the inner corner formed on the back surface of the first metal member and the first side surface of the second metal member to the second butt portion. On the other hand, in the first butt portion friction stir welding step, which includes an inner corner temporary joining step of performing spot temporary attachment, the stirring pin of the second rotation tool is used only for the first metal member, or the first metal member and the first metal member. It is characterized in that the first butt portion is friction-stir welded in a state of being in contact with the second metal member.
Further, the present invention includes a preparatory step of preparing a plate-shaped first metal member having a stepped portion formed on the back surface of the end portion and preparing a plate-shaped second metal member, and the above-mentioned first metal member. The step bottom surface of the step portion and the end surface of the second metal member are abutted to form the first abutting portion, and the step side surface of the step portion and the first side surface of the second metal member are abutted to form a second. The butt step for forming the butt portion and the second rotation tool provided with the shoulder portion and the stirring pin are inserted from the end face of the first metal member and the second side surface side of the second metal member, and the second rotation tool An outer corner friction stir welding step in which the shoulder portion is in contact with the first metal member and the second metal member and is relatively moved along the first butt portion to perform friction stir welding of the first butt portion. Only the stirring pin of the first rotating tool is inserted from the surface side of the first metal member, and the first rotating tool is relatively moved along the step portion to perform friction stir welding of the first butt portion. The first butt portion from the end face of the first metal member and the second side surface side of the second metal member before the partial friction stirring step and the outer corner friction stirring step or the first butt portion friction stirring step. In the friction stir welding step of the first butt portion, only the stirring pin of the first rotating tool is used only for the first metal member, or the first metal, including the outer corner temporary joining step of temporarily attaching the spot to the metal. The first butt portion is friction-stir welded in a state of being in contact with the member and the second metal member.
Further, the present invention includes a preparatory step of preparing a plate-shaped first metal member having a stepped portion formed on the back surface of the end portion and preparing a plate-shaped second metal member, and the above-mentioned first metal member. The step bottom surface of the step portion and the end surface of the second metal member are abutted to form the first abutting portion, and the step side surface of the step portion and the first side surface of the second metal member are abutted to form a second. The butt step for forming the butt portion and the second rotation tool provided with the shoulder portion and the stirring pin are inserted from the end face of the first metal member and the second side surface side of the second metal member, and the second rotation tool An outer corner friction stir step in which the shoulder portion is in contact with the first metal member and the second metal member and is relatively moved along the first butt portion to perform friction stir welding of the first butt portion. Only the stirring pin of the first rotating tool is inserted from the surface side of the first metal member, and the first rotating tool is relatively moved along the step portion to perform friction stir welding of the first butt portion. From the inner corner formed on the back surface of the first metal member and the first side surface of the second metal member before the partial friction stirring step and the outer corner friction stirring step or the first butt portion friction stirring step. In the first butt portion friction stir welding step, which includes an inner corner temporary joining step of temporarily attaching a spot to the second butt portion, only the stirring pin of the first rotating tool is used only for the first metal member. Alternatively, the first butt portion is subjected to friction stir welding in a state of being in contact with the first metal member and the second metal member.

According to such a joining method, contamination cannot be prevented because the inner corners of the metal members are not welded to each other. Further, since friction stir welding is performed on the first butt portion from two directions, watertightness and airtightness can be improved. Further, when only the stirring pin is inserted, the load applied to the friction stir device can be reduced. Further, when friction stir welding is performed with the shoulder portions in contact with each other, the generation of burrs can be suppressed. Further, according to such a joining method, since the first metal member and the second metal member can be temporarily fixed, it is possible to prevent the opening in the first butt portion friction stirring step and the outer corner friction stirring step.

Further, the present invention includes a preparatory step of preparing a plate-shaped first metal member having a stepped portion formed on the back surface of the end portion and preparing a plate-shaped second metal member, and the above-mentioned first metal member. The step bottom surface of the step portion and the end surface of the second metal member are abutted to form the first abutting portion, and the step side surface of the step portion and the first side surface of the second metal member are abutted to form a second. The butt step of forming the butt portion and the stirring pin of the second rotating tool provided with the shoulder portion and the stirring pin are inserted from the end surface of the first metal member and the second side surface side of the second metal member, and the shoulder portion is formed. The outer corner friction stir welding step of friction stir welding the first butt portion by relatively moving the first metal member and the second metal member in contact with the first butt portion and the first butt portion. (1) With the shoulder portion of the second rotating tool in contact with the surface of the first metal member from the surface side of the metal member, the second rotating tool is relatively moved along the stepped portion to obtain the first. Before performing the first butt portion friction stir welding step of friction stir welding of the butt portions and the outer corner friction stirring step or the first butt portion friction stirring step, the end face of the first metal member and the second metal member The outer corner temporary joining step of temporarily attaching a spot to the first butt portion from the second side surface side is included, and in the first butt portion friction stir welding step, the stirring pin of the second rotating tool is used as the first. It is characterized in that the first butt portion is friction-stir welded with only the metal member or in contact with the first metal member and the second metal member.
Further, the present invention includes a preparatory step of preparing a plate-shaped first metal member having a stepped portion formed on the back surface of the end portion and preparing a plate-shaped second metal member, and the above-mentioned first metal member. The step bottom surface of the step portion and the end surface of the second metal member are abutted to form the first abutting portion, and the step side surface of the step portion and the first side surface of the second metal member are abutted to form a second. The butt step of forming the butt portion and the stirring pin of the second rotating tool provided with the shoulder portion and the stirring pin are inserted from the end surface of the first metal member and the second side surface side of the second metal member, and the shoulder portion is formed. The outer corner friction stir welding step of friction stir welding the first butt portion by relatively moving the first metal member and the second metal member in contact with the first butt portion and the first butt portion. (1) With the shoulder portion of the second rotating tool in contact with the surface of the first metal member from the surface side of the metal member, the second rotating tool is relatively moved along the stepped portion to obtain the first. Before performing the first butt portion friction stir welding step of friction stir welding of the butt portions and the outer corner friction stirring step or the first butt portion friction stirring step, the back surface of the first metal member and the second metal member In the first butt portion friction stir welding step, the second rotary tool is agitated, including an inner corner temporary joining step of temporarily attaching a spot from the inner corner formed on the first side surface to the second butt portion. The first butt portion is friction-stir welded with the pin in contact with only the first metal member or the first metal member and the second metal member.

According to such a joining method, contamination cannot be prevented because the inner corners of the metal members are not welded to each other. Further, since friction stir welding is performed on the first butt portion from two directions, watertightness and airtightness can be improved. Further, in the outer corner friction stir welding step and the first butt portion friction stir welding step, the generation of burrs can be suppressed by performing friction stir welding with the shoulder portions in contact with each other. Further, according to such a joining method, since the first metal member and the second metal member can be temporarily fixed, it is possible to prevent the opening in the first butt portion friction stirring step and the outer corner friction stirring step.

According to the joining method according to the present invention, it is possible to prevent contamination from occurring in the inner corners of the metal members and to improve watertightness and airtightness.

It is sectional drawing which shows the preparation process and the butt process which concerns on 1st Embodiment. It is a perspective view which shows the tab material arrangement process which concerns on 1st Embodiment. It is a perspective view which shows the friction stir welding process of the 1st butt part which concerns on 1st Embodiment. It is sectional drawing which shows the 1st butt part friction stirring process which concerns on 1st Embodiment. It is a perspective view which shows the outer corner friction stir welding process which concerns on 1st Embodiment. It is sectional drawing which shows the outer corner friction stirring process which concerns on 1st Embodiment. It is a perspective view which shows the 1st butting part friction stir welding process which concerns on 2nd Embodiment. It is sectional drawing which shows the 1st butt part friction stirring process which concerns on 2nd Embodiment. It is a perspective view which shows the outer corner friction stir welding process which concerns on 3rd Embodiment. It is sectional drawing which shows the outer corner friction stirring process which concerns on 3rd Embodiment. It is a perspective view which shows the outer corner temporary joining process. It is a perspective view which shows the inner corner temporary joining process.

[First Embodiment]
The joining method according to the first embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, in the joining method according to the first embodiment, the first metal member 1 and the second metal member 2 are butted against each other in an L shape and joined. The joining method according to the first embodiment includes a preparation step, a butt step, a tab material arranging step, a first butt portion friction agitation step, and an outer corner friction agitation step. The "front surface" in the description means the surface opposite to the "back surface".

As shown in FIG. 1, the preparatory step is a step of preparing the first metal member 1 and the second metal member 2. The first metal member 1 and the second metal member 2 are plate-shaped metal members. The materials of the first metal member 1 and the second metal member 2 are appropriately selected from frictionally agitable metals such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium and magnesium alloy. A step portion 11 is formed on the back surface 1c of the end portion of the first metal member 1. The step portion 11 is composed of a step bottom surface 11a and a step side surface 11b that rises vertically from the step bottom surface 11a. The width dimension of the step bottom surface 11a is the same as the plate thickness dimension of the second metal member 2.

As shown in FIG. 1, the butt step is a step of butt-butting the first metal member 1 and the second metal member 2 in an L shape. In the butt step, the end surface 2a of the second metal member 2 is abutted against the step bottom surface 11a of the first metal member 1 to form the first butt portion J1, and the first side surface 2b of the second metal member 2 is formed on the step side surface 11b. They are butted to form the second butted portion J2. The end surface 1a of the first metal member 1 and the second side surface 2c of the second metal member 2 are flush with each other. An inner corner is formed by the back surface 1c of the first metal member 1 and the first side surface 2b of the second metal member 2.

As shown in FIG. 2, the tab material arranging step is a step of arranging the tab materials T and T at both ends of the first metal member 1 and the second metal member 2 (only one is drawn in FIG. 2). The tab member T is a plate-shaped metal member made of the same material as the first metal member 1. The plate thickness dimension of the tab material T is the same as the plate thickness dimension of the first metal member 1. In the tab material arranging step, the side surface of the tab material T is abutted against the side surface 1d of the first metal member 1, and the butt portion is joined by welding. The front surface Ta of the tab material T and the front surface 1b of the first metal member 1 are flush with each other, and the back surface Tb of the tab material T and the back surface 1c of the first metal member 1 are flush with each other. Further, the side surface Tc of the tab member T and the end surface 1a of the first metal member 1 are made flush with each other.

As shown in FIGS. 3 and 4, the first butt portion friction stir welding step is a step of inserting the first rotation tool F from the surface 1b of the first metal member 1 and friction stir welding the first butt portion J1. .. The first rotation tool F is composed of a connecting portion F1 and a stirring pin F2, and is made of, for example, tool steel. The connecting portion F1 is a portion attached to a friction stir device (not shown) and exhibits a columnar shape. The stirring pin F2 hangs down from the connecting portion F1 and is coaxial with the connecting portion F1. The stirring pin F2 is tapered as it is separated from the connecting portion F1. A spiral groove is engraved on the outer peripheral surface of the stirring pin F2. In the present embodiment, in order to rotate the first rotation tool F clockwise, the spiral groove is formed counterclockwise from the base end to the tip end.

When the first rotation tool F is rotated counterclockwise, it is preferable to form the spiral groove clockwise from the base end to the tip end. By setting the spiral groove in this way, the metal plastically fluidized during friction stir welding is guided to the tip end side of the stirring pin F2 by the spiral groove. As a result, the amount of metal that overflows to the outside of the metal member to be joined (first metal member 1, second metal member 2) can be reduced.

In the friction stir welding step of the first butt portion, as shown in FIG. 3, the first rotation tool F rotated clockwise is inserted into the start position Sp set on the surface Ta of the tab material T, and the step portion 11 (second metal). The first rotation tool F is relatively moved along the member 2). As shown in FIG. 4, the insertion depth of the first rotation tool F is set so that the stirring pin F2 contacts the first metal member 1 and the second metal member 2 in the present embodiment. A plasticized region W1 is formed in the movement locus of the first rotation tool F. The insertion depth of the stirring pin F2 may be set so as to come into contact with only the first metal member 1. In this case, the frictional heat between the stirring pin F2 and the first metal member 1 causes plastic fluidization around the first butt portion J1 to join them.

The first rotation tool F is preferably attached to a robot arm having a driving means such as a spindle unit at its tip. As a result, the rotation center axis of the first rotation tool F can be easily tilted when the outer corner friction stir welding step described later is performed.

As shown in FIG. 5, the outer corner friction stir welding step is a step of inserting a stirring pin F2 from the outer corner and friction stir welding the first butt portion J1. The outer corner means the opposite side of the inner corner, and in the present embodiment, it is composed of a surface 1b of the first metal member 1, an end surface 1a, and a second side surface 2c of the second metal member 2. In the outer corner friction stir welding step, the first rotation tool F rotated clockwise is inserted into the start position Sp set on the side surface Tc of the tab material T, and the first butt portion J1 is inserted from the front side to the back side in FIG. The first rotation tool F is relatively moved along the above. A plasticized region W2 is formed in the movement locus of the first rotation tool F. As shown in FIG. 6, the insertion depth of the stirring pin F2 may be appropriately set, but for example, the plasticization region W1 and the plasticization region W2 may be set to overlap. When the outer corner friction stir welding step is completed, the tab material T is cut off.

According to the joining method according to the present embodiment described above, welding is not performed from the inner corners of the first metal member 1 and the second metal member 2, but friction stir welding is performed from the outer corners. It is possible to prevent contamination from occurring in the corners. Further, since friction stir welding is performed on the first butt portion J1 from two directions, watertightness and airtightness can be improved.

Further, since only the stirring pin F2 is inserted, the load applied to the friction stir device can be reduced. Further, by providing the step portion 11, it is possible to prevent the position shift between the first metal member 1 and the second metal member 2 in the butt step. In the present embodiment, the outer corner friction stirring step is performed after the first butt portion stirring step, but the first butt portion stirring step may be performed after the outer corner friction stirring step.

[Second Embodiment]
Next, the joining method according to the second embodiment of the present invention will be described. The joining method according to the second embodiment is different from the first embodiment in that the first rotation tool F and the second rotation tool G shown in FIG. 7 are used. In the second embodiment, the parts different from the first embodiment will be mainly described.

In the joining method according to the second embodiment, a preparation step, a butt step, a tab material arranging step, a first butt portion friction stirring step, and an outer corner friction stirring step are performed. Since the preparation step, the butt step, and the tab material placement step are the same as those in the first embodiment, the description thereof will be omitted.

The first butt portion friction stir welding step is a step of friction stir welding the first butt portion J1 using the second rotation tool G. As shown in FIGS. 7 and 8, the second rotation tool G includes a columnar shoulder portion G1 and a stirring pin G2 hanging from the lower end surface G1a of the shoulder portion G1. In the friction stir welding step of the first butt portion, as shown in FIG. 7, the second rotation tool G rotated clockwise from the start position Sp set on the surface Ta of the tab material T is inserted, and the first butt portion J1 (second). The lower end surface G1a of the shoulder portion G1 is relatively moved along the metal member 2) while being in contact with the surface 1b of the first metal member 1.

The insertion depth of the second rotation tool G may be appropriately set, but in the present embodiment, the stirring pin G2 is set so as to come into contact with the first metal member 1 and the second metal member 2. The insertion depth may be set so that the stirring pin G2 comes into contact with only the first metal member 1. In this case, the metal around the first butt portion J1 is plastically fluidized and joined by the frictional heat between the stirring pin G2 and the first metal member 1. In the outer corner friction stir welding step, as in the first embodiment, the first rotation tool F is inserted from the end surface 1a of the first metal member and the second side surface 2c of the second metal member 2 into the first butt portion J1. On the other hand, it is a step of performing friction stir welding.

The joining method according to the second embodiment described above can also obtain substantially the same effect as that of the first embodiment. Further, by bringing the shoulder portion G1 of the second rotation tool G into contact with the surface 1b of the first metal member 1, the generation of burrs can be suppressed. In the present embodiment, the outer corner friction stirring step is performed after the first butt portion stirring step, but the first butt portion stirring step may be performed after the outer corner friction stirring step.

[Third Embodiment]
Next, the joining method according to the third embodiment of the present invention will be described. In the joining method according to the third embodiment, the rotation tool used is different from that of the second embodiment. In the third embodiment, the parts different from the second embodiment will be mainly described.

In the joining method according to the third embodiment, a preparation step, a butt step, a tab material arranging step, an outer corner friction stirring step, and a first butt portion friction stirring step are performed. Since the preparation step, the butt step, and the tab material placement step are the same as those in the first embodiment, the description thereof will be omitted.

The outer corner friction stir welding step is a step of friction stir welding the first butt portion J1 using the second rotation tool G. In the outer corner friction stir welding step, as shown in FIGS. 9 and 10, the second rotation tool G rotated clockwise is inserted into the start position Sp set on the side surface Tc of the tab member T, and is inserted into the first butt portion J1. Along the same direction, the lower end surface G1a of the shoulder portion G1 is relatively moved while being in contact with the end surface 1a of the first metal member 1 and the second side surface 2c of the second metal member 2. A plasticized region W1 is formed in the movement locus of the second rotation tool G. The first butt portion friction stir welding step is a step of inserting the first rotation tool F from the surface 1b of the first metal member 1 and performing friction stir welding with the first butt portion J1 as in the first embodiment. Is.

The same effect as that of the second embodiment can be obtained by the joining method according to the third embodiment described above. Further, in the outer corner friction stir welding step, the occurrence of burrs is suppressed by bringing the shoulder portion G1 of the second rotation tool G into contact with the end surface 1a of the first metal member 1 and the second side surface 2c of the second metal member 2. be able to. In the present embodiment, the first butt portion stirring step is performed after the outer corner friction stirring step, but the outer corner friction stirring step may be performed after the first butt portion stirring step.

Although the embodiments of the present invention have been described above, the design can be appropriately changed within a range not contrary to the gist of the present invention. For example, as shown in FIG. 11, the outer corner temporary joining step may be performed before the first butt portion friction stirring step or the outer corner friction stirring step. In the outer corner temporary joining step, the first rotation tool F (also possible with the second rotation tool G) is inserted from the end surface 1a of the first metal member 1 and the second side surface 2c of the second metal member 2, and the stirring pin F2 is made shallow. It is inserted and temporarily joined to the first butt portion J1 at a spot. A point-shaped plasticized region W0 is formed in the first butt portion J1.

Further, for example, as shown in FIG. 12, an inner corner temporary joining step may be performed before the first butt portion friction stirring step or the outer corner friction stirring step. In the inner corner temporary joining step, the first rotation tool F is inserted from the inner corner formed by the back surface 1c of the first metal member 1 and the first side surface 2b of the second metal member 2, and the stirring pin F2 is inserted shallowly. Temporarily join the second butt portion J2 with a spot. A point-shaped plasticized region W0 is formed in the second butt portion (inner corner).

According to the outer corner temporary joining step and the inner corner temporary joining step, it is necessary to prevent the first metal member 1 and the second metal member 2 from opening when performing the first butt portion friction stir welding step and the outer corner friction stir welding step. Can be done. In addition, the joining cycle can be shortened by performing temporary joining at the spot. The outer corner temporary joining step may be performed by welding such as MIG welding, TIG welding, or laser welding. Further, in addition to the first butt portion friction stirring step and the outer corner friction stirring step, the first rotation tool F is formed by the back surface 1c of the first metal member 1 and the first side surface 2b of the second metal member 2. An inner corner joining step of inserting from a corner, inserting the stirring pin F2 deeply, and continuously performing friction stir welding to the second butt portion J2 may be performed.

1 1st metal member 1b front surface 1c back surface 2 2nd metal member 2b 1st side surface 2c 2nd side surface J1 1st butt part J2 2nd butt part F rotation tool F1 connection part F2 stirring pin G rotation tool G1 shoulder part G2 stirring pin W1 plasticization area W2 plasticization area

Claims (8)

A preparatory step for preparing a plate-shaped first metal member having a stepped portion formed on the back surface of the end portion and preparing a plate-shaped second metal member, and
The step bottom surface of the step portion of the first metal member and the end surface of the second metal member are abutted to form the first butted portion, and the step side surface of the step portion and the first of the second metal member. A butt process that butt the sides to form a second butt,
Only the stirring pin of the first rotation tool is inserted from the end surface of the first metal member and the second side surface of the second metal member, and the first butt portion is frictionally agitated by being relatively moved along the first butt portion. The outer corner friction stirring process to be joined and
Only the stirring pin of the first rotating tool is inserted from the surface side of the first metal member, the first rotating tool is relatively moved along the step portion, and the first butt portion is friction stir welded. One butt part friction stirring process and
Before performing the outer corner friction stirring step or the first butt portion friction stirring step, spot temporary attachment is applied to the first butt portion from the end surface of the first metal member and the second side surface side of the second metal member. Including the outer corner temporary joining process ,
In the first butt portion friction stir welding step, the first butt is held in a state where only the stirring pin of the first rotation tool is in contact with only the first metal member or the first metal member and the second metal member. A joining method characterized by friction stir welding of parts. A preparatory step for preparing a plate-shaped first metal member having a stepped portion formed on the back surface of the end portion and preparing a plate-shaped second metal member, and
The step bottom surface of the step portion of the first metal member and the end surface of the second metal member are abutted to form the first butted portion, and the step side surface of the step portion and the first of the second metal member. A butt process that butt the sides to form a second butt,
Only the stirring pin of the first rotation tool is inserted from the end surface of the first metal member and the second side surface of the second metal member, and the first butt portion is frictionally agitated by being relatively moved along the first butt portion. The outer corner friction stirring process to be joined and
Only the stirring pin of the first rotating tool is inserted from the surface side of the first metal member, the first rotating tool is relatively moved along the step portion, and the first butt portion is friction stir welded. One butt part friction stirring process and
Before performing the outer corner friction stirring step or the first butt portion friction stirring step, from the inner corner formed on the back surface of the first metal member and the first side surface of the second metal member to the second butt portion. On the other hand, including the inner corner temporary joining process of performing spot temporary attachment ,
In the first butt portion friction stir welding step, the first butt is held in a state where only the stirring pin of the first rotation tool is in contact with only the first metal member or the first metal member and the second metal member. A joining method characterized by friction stir welding of parts. A preparatory step for preparing a plate-shaped first metal member having a stepped portion formed on the back surface of the end portion and preparing a plate-shaped second metal member, and
The step bottom surface of the step portion of the first metal member and the end surface of the second metal member are abutted to form the first butted portion, and the step side surface of the step portion and the first of the second metal member. A butt process that butt the sides to form a second butt,
Only the stirring pin of the first rotation tool is inserted from the end surface of the first metal member and the second side surface side of the second metal member, and the first metal member is moved relative to the first butt portion to rub the first butt portion. The outer corner friction stirring process for stirring and joining,
The stirring pin of the second rotation tool provided with the shoulder portion and the stirring pin is inserted from the surface side of the first metal member, and the second rotation is performed in a state where the shoulder portion is in contact with the surface of the first metal member. The first butt portion friction stirring step in which the tool is relatively moved along the step portion and the first butt portion is friction-stir welded.
Before performing the outer corner friction stirring step or the first butt portion friction stirring step, spot temporary attachment is applied to the first butt portion from the end surface of the first metal member and the second side surface side of the second metal member. Including the outer corner temporary joining process ,
In the first butt portion friction stirring step, the first butt portion is in contact with the stirring pin of the second rotation tool only for the first metal member or the first metal member and the second metal member. A joining method characterized by friction stir welding. A preparatory step for preparing a plate-shaped first metal member having a stepped portion formed on the back surface of the end portion and preparing a plate-shaped second metal member, and
The step bottom surface of the step portion of the first metal member and the end surface of the second metal member are abutted to form the first butted portion, and the step side surface of the step portion and the first of the second metal member. A butt process that butt the sides to form a second butt,
Only the stirring pin of the first rotation tool is inserted from the end surface of the first metal member and the second side surface side of the second metal member, and the first metal member is moved relative to the first butt portion to rub the first butt portion. The outer corner friction stirring process for stirring and joining,
The stirring pin of the second rotation tool provided with the shoulder portion and the stirring pin is inserted from the surface side of the first metal member, and the second rotation is performed in a state where the shoulder portion is in contact with the surface of the first metal member. The first butt portion friction stirring step in which the tool is relatively moved along the step portion and the first butt portion is friction-stir welded.
Before performing the outer corner friction stirring step or the first butt portion friction stirring step, from the inner corner formed on the back surface of the first metal member and the first side surface of the second metal member to the second butt portion. On the other hand, including the inner corner temporary joining process of performing spot temporary attachment ,
In the first butt portion friction stirring step, the first butt portion is in contact with the stirring pin of the second rotation tool only for the first metal member or the first metal member and the second metal member. A joining method characterized by friction stir welding. A preparatory step for preparing a plate-shaped first metal member having a stepped portion formed on the back surface of the end portion and preparing a plate-shaped second metal member, and
The step bottom surface of the step portion of the first metal member and the end surface of the second metal member are abutted to form the first butted portion, and the step side surface of the step portion and the first of the second metal member. A butt process that butt the sides to form a second butt,
A second rotation tool provided with a shoulder portion and a stirring pin is inserted from the end surface of the first metal member and the second side surface side of the second metal member, and the shoulder portion of the second rotation tool is inserted into the first metal member and the shoulder portion. An outer corner friction stir welding step of friction stir welding of the first butt portion by relatively moving along the first butt portion in a state of being in contact with the second metal member.
Only the stirring pin of the first rotating tool is inserted from the surface side of the first metal member, and the first rotating tool is relatively moved along the step portion to perform friction stir welding of the first butt portion. Partial friction stirring process and
Before performing the outer corner friction stirring step or the first butt portion friction stirring step, spot temporary attachment is applied to the first butt portion from the end surface of the first metal member and the second side surface side of the second metal member. Including the outer corner temporary joining process ,
In the first butt portion friction stir welding step, the first butt is held in a state where only the stirring pin of the first rotation tool is in contact with only the first metal member or the first metal member and the second metal member. A joining method characterized by friction stir welding of parts. A preparatory step for preparing a plate-shaped first metal member having a stepped portion formed on the back surface of the end portion and preparing a plate-shaped second metal member, and
The step bottom surface of the step portion of the first metal member and the end surface of the second metal member are abutted to form the first butted portion, and the step side surface of the step portion and the first of the second metal member. A butt process that butt the sides to form a second butt,
A second rotation tool provided with a shoulder portion and a stirring pin is inserted from the end surface of the first metal member and the second side surface side of the second metal member, and the shoulder portion of the second rotation tool is inserted into the first metal member and the shoulder portion. An outer corner friction stir welding step of friction stir welding of the first butt portion by relatively moving along the first butt portion in a state of being in contact with the second metal member.
Only the stirring pin of the first rotating tool is inserted from the surface side of the first metal member, and the first rotating tool is relatively moved along the step portion to perform friction stir welding of the first butt portion. Partial friction stirring process and
Before performing the outer corner friction stirring step or the first butt portion friction stirring step, from the inner corner formed on the back surface of the first metal member and the first side surface of the second metal member to the second butt portion. On the other hand, including the inner corner temporary joining process of performing spot temporary attachment ,
In the first butt portion friction stir welding step, the first butt is held in a state where only the stirring pin of the first rotation tool is in contact with only the first metal member or the first metal member and the second metal member. A joining method characterized by friction stir welding of parts. A preparatory step for preparing a plate-shaped first metal member having a stepped portion formed on the back surface of the end portion and preparing a plate-shaped second metal member, and
The step bottom surface of the step portion of the first metal member and the end surface of the second metal member are abutted to form the first butted portion, and the step side surface of the step portion and the first of the second metal member. A butt process that butt the sides to form a second butt,
A stirring pin of a second rotation tool provided with a shoulder portion and a stirring pin is inserted from the end surface of the first metal member and the second side surface side of the second metal member, and the shoulder portion is inserted into the first metal member and the first metal member. (Ii) An outer corner friction stir step in which the first butt portion is subjected to friction stir welding by relatively moving along the first butt portion in contact with the metal member.
With the shoulder portion of the second rotation tool in contact with the surface of the first metal member from the surface side of the first metal member, the second rotation tool is relatively moved along the step portion to obtain the above. Friction stir welding process of the first butt section and friction stir welding of the first butt section
Before performing the outer corner friction stirring step or the first butt portion friction stirring step, spot temporary attachment is applied to the first butt portion from the end surface of the first metal member and the second side surface side of the second metal member. Including the outer corner temporary joining process ,
In the first butt portion friction stirring step, the first butt portion is in contact with the stirring pin of the second rotation tool only for the first metal member or the first metal member and the second metal member. A joining method characterized by friction stir welding. A preparatory step for preparing a plate-shaped first metal member having a stepped portion formed on the back surface of the end portion and preparing a plate-shaped second metal member, and
The step bottom surface of the step portion of the first metal member and the end surface of the second metal member are abutted to form the first butted portion, and the step side surface of the step portion and the first of the second metal member. A butt process that butt the sides to form a second butt,
A stirring pin of a second rotation tool provided with a shoulder portion and a stirring pin is inserted from the end surface of the first metal member and the second side surface side of the second metal member, and the shoulder portion is inserted into the first metal member and the first metal member. (Ii) An outer corner friction stir step in which the first butt portion is subjected to friction stir welding by relatively moving along the first butt portion in contact with the metal member.
With the shoulder portion of the second rotation tool in contact with the surface of the first metal member from the surface side of the first metal member, the second rotation tool is relatively moved along the step portion to obtain the above. Friction stir welding process of the first butt section and friction stir welding of the first butt section
Before performing the outer corner friction stirring step or the first butt portion friction stirring step, from the inner corner formed on the back surface of the first metal member and the first side surface of the second metal member to the second butt portion. On the other hand, including the inner corner temporary joining process of performing spot temporary attachment ,
In the first butt portion friction stirring step, the first butt portion is in contact with the stirring pin of the second rotation tool only for the first metal member or the first metal member and the second metal member. A joining method characterized by friction stir welding.

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