JP2008036648A - Method for joining member to be joined, and joined structure of member to be joined - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for joining a member to be joined by which even thick members different in the friction stir welding can be reliably joined with each other by applying the friction stir welding and there is no possibility of degrading the mechanical strength of a joined structure, and to provide the joined structure foof the member to be joined. <P>SOLUTION: In the joined structure of the members to be joined, the members 11, 11 having a portion which is thick-walled and cannot be subjected to the friction stir welding on a joining face 11A are joined with each other via joining faces 11A, 11A. A joined portion of the members 11, 11 comprises a first joined portion 12 formed by the friction stir welding along a boundary line of the members 11, 11 and a second joined portion 14 with other portion which cannot be subjected to the friction stir welding than the first joined portion 12 being joined therewith via a first brazing filler metal 13 making use of the remaining heat of the friction stir welding. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for joining materials to be joined using a friction stir welding method and a joining structure for materials to be joined, and more specifically, without leaving an unjoined part using friction stir welding even for thick materials to be joined. The present invention relates to a method for joining materials to be joined and a joining structure for materials to be joined.

  The friction stir welding technique has attracted attention as a technique for joining materials to be joined. The friction stir welding technique is advantageous in that it can prevent a decrease in strength at the joint because solid-phase joining can be performed without melting the materials to be joined. However, when the thickness of the materials to be joined exceeds a predetermined thickness, there are portions where the friction stir welding does not reach, and the materials to be joined may not be joined by friction stir welding. In other words, the thickness of the material to be joined by friction stir welding is determined by the tool to be friction stir welded. If the thickness capable of friction stir welding is, for example, 10 mm, the thickness of the material to be joined can be increased. There wasn't. Friction stir welding means that a tool having a protrusion is brought into contact with a material to be joined while rotating at high speed, and frictional heat is applied to the material to be joined, and the material is fluidized by plasticization and viscosity to be solid-phase joined. That means.

  Therefore, as a technique for solving such inconvenience, Patent Document 1 proposes a friction stir welding method for thick materials to be joined and a joining structure thereof. In this technique, stepped portions are formed along the joining ends of the thick materials to be joined, and the outermost end surfaces in surface contact with each other in a state where a plurality of end surfaces formed by the stepped portions are adjacent to each other. The friction stir welding is performed along the gap, and the same kind of metal as the material to be joined or a metal capable of friction stir welding is formed in a concave groove formed on at least one side of the end face and between the inner end faces of each stepped portion. A connecting plate is inserted, and friction stir welding is performed along each of the connecting plate and each inner end face of each of the materials to be joined.

  In other words, in the case of thick materials to be joined that cannot be subjected to a single friction stir welding, stepped portions are provided on the joining surfaces of the materials to be joined, leaving a thickness that allows friction stir welding, and joining surfaces other than the stepped portions are connected to each other. Make surface contact. Then, the surface contact portions are friction stir welded to join the materials to be joined. By this joining, a concave groove is formed on one surface of each material to be joined. After inserting the connection plate into the groove, the wall surface of the groove of each material to be joined and both side surfaces of the connection plate are friction stir welded. As a result, each material to be joined is completely joined via the connection plate.

JP-A-11-342481

However, in the friction stir welding method for thick-walled workpieces described in Patent Document 1, a step portion is provided in a portion that does not reach the friction stir welding, and the joining surfaces of the respective workpieces are brought into contact with each other to provide a gap between the step portions. After forming a concave groove and performing friction stir welding along the boundary line formed on the bottom surface of the concave groove, a connecting plate is inserted into the concave groove, and friction stir welding is performed along both side surfaces of the connecting plate. Therefore, a step that becomes a groove is provided in the part where friction stir welding does not reach the joint surface, and a connecting plate is inserted into the groove to friction stir the both wall surfaces of the groove and both sides of the connection plate. Must be joined. Furthermore, since there exists an unjoined portion that does not reach the friction stir welding between the bottom surface of the concave groove and the lower surface of the connecting plate, the mechanical strength of the joining structure of the materials to be joined may be reduced. If the wall thickness is even thicker, leave a part that can be friction stir welded on the joint surface, and provide the groove on the other part of the joint surface in multiple steps, with the groove gradually widening. Since each connecting plate is inserted into each concave groove and friction stir welding is performed each time, an unjoined portion as described above remains between the connecting plate and the material to be joined each time. As the width increases, the unbonded area increases, and the mechanical strength of the bonded structure of the materials to be bonded decreases more and more significantly.

  The present invention has been made in order to solve the above-described problem. Even when the materials to be joined are not thick enough to be subjected to friction stir welding, the friction stir welding between the materials to be joined can be achieved by applying the friction stir welding. An object of the present invention is to provide a bonding method for a material to be bonded and a bonding structure for a material to be bonded, which can be reliably bonded without leaving an unbonded portion in a non-bonded portion, and which does not reduce the mechanical strength of the bonding structure. It is said.

  According to a first aspect of the present invention, there is provided a method for joining materials to be joined, in which the materials to be joined having thick portions that do not reach friction stir welding on the joining surfaces are joined via the joining surfaces. A method for joining materials, a step of interposing a brazing material between the joining surfaces of each of the materials to be joined, a step of bringing the joining surfaces of the materials to be joined together through the brazing material, and the above Friction stir welding of each of the materials to be bonded along the boundary line of each of the materials to be bonded from one surface side of each of the materials to be bonded, and residual heat of the friction stir welding at a portion of the bonding surface that does not reach the friction stir welding And joining each of the materials to be joined via the brazing material.

  Moreover, the joining method of the to-be-joined material of Claim 2 of this invention is along the boundary line of each said to-be-joined material in the invention of Claim 1 from the other surface side of each to-be-joined material. It comprises a step of friction stir welding.

  Moreover, the joining method of the to-be-joined material of Claim 3 of this invention joins the to-be-joined materials which have a part which does not reach friction stir welding on the joining surface through each said joining surface. A bonding method for a material to be bonded, the step of providing a step on at least one of the upper and lower sides of each of the bonding surfaces of each of the bonded materials, and a bonding surface other than the step of each of the bonded materials A step of interposing one brazing material, a step of bringing the bonding surfaces other than the stepped portions of the respective bonded materials into contact with each other via the first brazing material, and forming a groove by the stepped portions, Friction stir welding is performed on each of the materials to be bonded along a boundary line of each of the materials to be bonded formed in the groove, and a portion that does not reach the friction stir welding is used for the first heat using the residual heat of the friction stir welding. The step of joining via the brazing material and the groove A step of laying a second brazing material on the surface; a step of fitting the complementary material into the groove to fill the groove; and at least along a boundary line between the side surfaces of the complementary material and the bonded materials. Friction stir welding is performed for each material to be joined and the complementary material, and at the bottom surface of the groove, each of the materials to be joined and the complementary material are respectively connected via the second brazing material using the residual heat of the friction stir welding. And a joining step.

  According to a fourth aspect of the present invention, there is provided a method for joining a material to be joined according to the invention according to the third aspect, wherein a plurality of step portions are formed in a stepped manner on at least one of the upper and lower sides of the joining surface of each of the materials to be joined. And a step of providing a complementary material sequentially through a second brazing material in a plurality of grooves formed by bringing the joining surfaces of the materials to be joined into contact with each other through the first brazing material. And a step of friction stir welding the at least both side surfaces of each of the complementary materials and each of the materials to be joined to each other.

  Moreover, the joining structure of the to-be-joined material of Claim 5 of this invention is joined to each to-be-joined material which has a part which does not reach friction stir welding on a joining surface through each said joining surface. In the joining structure of the materials to be joined, the joining portion of each of the materials to be joined includes a first joining portion formed by the friction stir welding along the boundary line of each of the materials to be joined, A portion other than the joint portion where the friction stir welding does not reach has a second joint portion joined via a first brazing material using the residual heat of the friction stir welding. .

  According to a sixth aspect of the present invention, there is provided a bonded structure for a material to be bonded according to the fifth aspect, in which the first bonding portion is vertically moved from the upper and lower surfaces of each bonded material toward the inside. It is formed in two places, and the second joint portion is formed continuously between the first joint portions in the upper and lower two places.

  According to a seventh aspect of the present invention, there is provided a joining structure for a material to be joined according to the invention according to the fifth or sixth aspect, wherein at least one of the joining surfaces of each of the materials to be joined is at least above or below the joining surface. One step portion is formed, and a complementary material is fitted through a second brazing material laid on the bottom surface of the groove composed of the respective step portions facing each other, and each of the materials to be joined And the joint portion of the complementary material is a third part in which each of the material to be joined and the complementary material is formed by friction stir welding along at least a boundary line between each of the materials to be joined and both side surfaces of the complementary material. A bonding portion; and a fourth bonding portion in which each of the materials to be bonded and the lower surface of the complementary material are bonded via the second brazing material using the residual heat of the friction stir welding. It is what.

  Moreover, the joining structure of the to-be-joined material of Claim 8 of this invention WHEREIN: The invention in Claim 5 or Claim 6 WHEREIN: At least one of the upper and lower sides of the joining surface of each said to-be-joined material has several steps | paragraphs. Each part is formed in a staircase shape, and is inserted into a plurality of upper and lower grooves made up of stepped parts facing each other so that the supplementary material overlaps with the second brazing material interposed therebetween, and The joining portion between the joining material and each complementary material is formed by friction stir welding between each of the joined materials and each of the other materials along at least a boundary line between each of the joined materials and the both side surfaces of the complementary materials. The 4th junction part by which the formed 3rd joined part, each said joined material, and the lower surface of each said complementary material were joined by said 2nd brazing material using the residual heat of said friction stir welding, respectively. It is characterized by having.

  According to the present invention, even if the materials to be welded are not thick enough to be subjected to friction stir welding, by performing the friction stir welding, there is no unjoined part left in the portion where the friction stir welding between the materials to be joined does not reach. It is possible to provide a bonding method for a material to be bonded and a bonding structure for a material to be bonded, which can be surely bonded and have no fear of reducing the mechanical strength of the bonding structure.

  Hereinafter, the present invention will be described based on the embodiment shown in FIGS. In each figure, FIG. 1 is a perspective view showing an embodiment of the joining structure of the material to be joined according to the present invention, and FIGS. 2A to 2C are each an embodiment of the joining method of the material to be joined according to the present invention. The perspective view which shows the principal part of this invention in order of a process, FIG. 3 is a perspective view which shows the joining structure of the to-be-joined material produced by other embodiment of the to-be-joined material of this invention, (a)-(c) of FIG. The perspective view which shows the principal part of further another embodiment of the joining method of the to-be-joined material of this invention in order of a process, FIG. 5 is joining of the to-be-joined material produced by other embodiment of the to-be-joined material of this invention. It is a perspective view which shows a structure.

1st Embodiment First, the joining structure of the to-be-joined material of this embodiment is demonstrated. As shown in FIG. 1, for example, the joining structure 10 of the materials to be joined according to the present embodiment includes one surface of the materials to be joined (for example, made of a metal material such as copper and aluminum) 11 and 11 (upper surface in FIG. Through the first joint 12 formed by friction stir welding along the boundary line between the workpieces 11 and 11 and the brazing material 13 melted by the residual heat generated during the friction stir welding of the first joint 12. And a second joint portion 14 joined together. And the 2nd junction part 14 has reached | attained from the 1st junction part 12 to the other surface (lower surface in the same figure) of the to-be-joined materials 11 and 11. FIG. The depth L of the second joint portion 14 may be a depth at which the brazing filler metal 13 is melted by the residual heat of the friction stir welding. The left and right materials 11 and 11 are not particularly limited as long as they are metal materials that can be joined to each other by friction stir welding, and these materials 11 and 11 are different metals even if they are the same metal material. It may be a material. The brazing material 13 is not particularly limited as long as it can join the materials 11 and 11 to be joined. In the present embodiment, for example, copper metal is used as the material to be joined 11, and silver solder is used as the brazing material 13, for example.

  That is, in the bonded structure 10 of the material to be bonded according to the present embodiment, the materials to be bonded 11 and 11 are basically bonded as the first bonding portion 12 by friction stir welding. A portion of the materials to be joined 11, 11 that does not reach the friction stir welding is joined as a second joint 14 via a brazing material 13. The brazing filler metal 13 is melted by the residual heat generated during the friction stir welding, and then solidifies to form the second joint portion 14. Therefore, the to-be-joined materials 11 and 11 are joined by forming the first joint portion 12 by one friction stir welding, and the brazing material 13 in which the portion that does not reach the friction stir welding is melted by the residual heat during the friction stir welding. Is solidified and joined as the second joint 14.

  Next, a procedure for obtaining the bonded structure 10 for bonding materials shown in FIG. 1 using one embodiment of the bonding method for bonded materials according to the present invention will be described with reference to FIGS. To do.

  In the joining method of the materials to be joined according to the present embodiment, first, as shown in FIG. 2A, the two materials to be joined 11 and 11 are arranged on the left and right so that the joining surfaces 11A and 11A face each other. In addition, for example, a foil-like brazing material 13 (for example, a silver brazing material) is disposed between the joint surfaces 11A and 11A. As shown in the figure, the foil-like brazing material 13 is formed in the same area as the joining surface 11A. In the present embodiment, the brazing material 13 has a size that covers the entire region of the bonding surface 11A of the material 11 to be bonded, but may have a size that covers only a region that does not reach the friction stir welding.

  Next, the left and right workpieces 11 and 11 are moved as indicated by arrows in FIG. 2 (a), and the left and right workpieces 11 and 11 are foil-shaped as shown in FIG. 2 (b). After sandwiching the material 13, the friction stir welding tool 20 is disposed at one end of the boundary line between the materials to be joined 11, 11 (the front end in the figure), that is, the front end of the brazing material 13. . The tool 20 includes a columnar tool body 21 and a probe 22 formed on the distal end surface of the tool main body 21, and the tool body 21 and the probe 22 are configured to share an axis. . Although not shown, for example, a groove is formed in a spiral shape on the peripheral surface of the probe 22, and the material to be joined 11 fluidized by the probe 22 is agitated. Further, the shoulder portion of the tool main body 21 has a function of preventing the bonded material 11 from being discharged to the outside when the probe 22 enters the bonded material 11 and rotates.

Thus, when the tool 20 is rotated at a high speed and pressed against the front end portion of the boundary line between the workpieces 11 and 11 with a predetermined load, the probe 22 and the workpieces 11 and 11 as shown in FIG. The to-be-joined materials 11 and 11 are fluidized by frictional heat with 11. As a result, the probe 22 of the tool 20 enters the boundary end portion, and the materials to be joined 11 and 11 are solid-welded together while stirring the materials 11 and 11 fluidized by the frictional heat. By moving the tool 20 from the front end portion of the boundary line to the back end portion thereof, the first joint portion 12 by friction stir welding centering on the boundary line on the upper surface side of the materials 11 and 11 to be joined. Can be formed on the upper surface side. At this time, the metal material is prevented from scattering from the first joint 12 at the shoulder of the tool body 21. Further, the frictional heat at the time of friction stir welding is transmitted to the lower surface side of the boundary line between the left and right workpieces 11, 11, and the brazing material 13 sandwiched between the respective workpieces 11, 11 is melted by this frictional heat. The materials to be joined 11 and 11 are joined via the material 13 to form the second joint portion 14. As a result, the left and right workpieces 11 and 11 are completely joined as the first and second joining portions 12 and 14 without leaving unjoined portions.

  As described above, according to the present embodiment, when the materials to be joined 11 and 11 having thick portions that do not reach the friction stir welding on the joining surface 11A are joined via the joining surfaces 11A and 11A, respectively. In addition, the step of interposing the brazing material 13 between the joining surfaces 11A and 11A of the left and right workpieces 11 and 11 and the joining surfaces 11A and 11A of the respective joining materials 11 and 11 are brought into contact with each other through the brazing material 13. And the step of friction stir welding of the members to be bonded 11 and 11 along the boundary line of the members to be bonded 11 and 11 from the upper surface of the members to be bonded 11 and 11 and the friction stir welding of the bonding surfaces 11A and 11A. In a portion that does not reach, a step of joining each of the materials to be joined 11 and 11 through the brazing material 13 using the residual heat of friction stir welding is provided. Boundary line of each material 11 and 11 Along the first joint 12 formed by friction stir welding and a portion other than the first joint 12 where the friction stir welding does not reach is joined via the brazing filler metal 13 using the residual heat of the friction stir welding. The joining structure 10 of the to-be-joined material which has the 2nd junction part 14 can be obtained. The joining structure 10 of the materials to be joined is capable of covering even a portion where the friction stir welding cannot be achieved only by performing the friction stir welding, even if the thick materials 11 and 11 having a portion where the friction stir welding is not achieved. The joining materials 11 and 11 can be completely joined to each other through the brazing material 13 without leaving an unjoined portion, and the mechanical strength is sufficient without reducing the mechanical strength of the joining structure 10 of the materials to be joined. Can be secured.

Second Embodiment Also in this embodiment, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and this embodiment will be described. For example, as illustrated in FIG. 3, the bonded structure 10 </ b> A of the present embodiment is thicker than the first embodiment, and bonds the bonded materials 11, 11 that cannot be bonded by one friction stir welding. Applies to

  For example, as shown in FIG. 3, the bonded structure 10 </ b> A according to the present embodiment includes first bonded portions 12, 12 formed from upper and lower surfaces of the left and right bonded materials 11, 11. Except that the 2nd junction part 14 is continuously formed between the 1st junction parts 12 and 12 between 12 and 12, it is constituted according to the 1st embodiment. That is, when the upper and lower first joints 12 and 12 are formed by friction stir welding, the second joint 14 is joined to the materials to be joined 11 and 11 by melting the brazing material 13 with the respective residual heat. Thus, the first joints 12 and 12 are formed continuously. The depth L1 of the second joint portion 14 is a length within a range in which the brazing material 13 is melted by the residual heat at the time of friction stir welding of the upper and lower first joint portions 12 and 12 and the joint surfaces 11A and 11A can be joined. If it is good.

  The brazing material 13 melts when the upper first joint portion 12 is formed by friction stir welding, and joins the upper half that does not reach the friction stir welding. The lower first joint portion 12 frictionally stirs. When formed by joining, the lower half melts and joins the remaining half. As shown in FIG. 3, the upper and lower first joints 12 and 12 may be friction stir welded at the same time by moving the upper and lower tools 20 synchronously. Stir welding may be used. The bonded structure 10A of the material to be bonded according to the present embodiment is applied when the material to be bonded 11 is thicker than that of the first embodiment, as is apparent from FIG. In FIG. 3, the region indicated by the alternate long and short dash line indicates the joint portion of the first joint portion 12 formed by friction stir welding.

  In the present embodiment, the same effects as those of the first embodiment can be expected, and even when the thickness of the material 11 to be joined is larger than that of the first embodiment, the materials 11 and 11 to be joined can be connected to each other. It can be reliably joined.

Third Embodiment Also in this embodiment, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and this embodiment will be described.

  The joining method of the to-be-joined materials of this embodiment joins the to-be-joined materials 11 and 11 which are thicker than 1st Embodiment similarly to 2nd Embodiment, and cannot be joined by one friction stir welding. Applied to the case, it is possible to obtain a joint structure instead of the second embodiment.

  In the present embodiment, first, as shown in FIGS. 4A and 4B, two members to be bonded 11 each having a step portion 11 </ b> B formed on the upper end portion of the bonding surface 11 </ b> A are prepared, and the members to be bonded 11 are prepared. , 11 is prepared as a complementary material 15 to be used for joining together. The complementary material 15 is preferably the same metal material as the material to be bonded 11, but may be a metal material different from the material to be bonded 11. Then, the bonding surfaces 11A and 11A of the two bonded materials 11 and 11 are opposed to each other, and the bonding surfaces 11A and 11A are brought into contact with each other through the first brazing material 13. Thereby, as shown to (a) of FIG. 4, the step parts 11B and 11B of each of the left and right to-be-joined materials 11 and 11 oppose, and the groove | channel 11C is formed. The first brazing material 13 appears in a linear shape at the center in the width direction of the groove 11 </ b> C, and is formed as a boundary line between the materials to be joined 11 and 11.

  Next, as shown in FIG. 4 (a), the tool 20 is rotated at a predetermined number of rotations while being pressed against the front end portion of the first brazing material 13 with a predetermined load, and the first brazing material in the groove 11C. 13, that is, the tool 20 is moved at a predetermined speed along the boundary line between the left and right workpieces 11, 11, and the first workpiece 12 is formed by friction stir welding of the workpieces 11, 11 with the probe 21. To do. Thereby, the 1st brazing material 13 fuse | melts with the residual heat at the time of friction stir welding similarly to the 1st, 2nd embodiment, and forms the 2nd junction part 14. FIG. A groove 11 </ b> C is formed between the left and right workpieces 11 and 11. Since the surface of the first bonding portion 12 formed on the bottom surface of the groove 11C is rough, it is flattened by cutting the bottom surface.

  Subsequently, as shown in FIG. 4B, for example, a foil-like second brazing material 13A is laid on the bottom surface of the groove 11C formed by the left and right workpieces 11 and 11, and then complemented in the groove 11C. The material 15 is fitted and the groove 11 </ b> C is filled with the complementary material 15. And as shown in (c) of the figure, using the tool 20, the left and right side surfaces of the complementary material 15 and both wall surfaces of the groove 11C are friction stir welded to form the third joint portion 16. Both ends of the second brazing material 13A interposed between the bottom surface of the groove 11C and the supplementary material 15 are melted by the residual heat during the friction stir welding, and the bottom surface of the groove 11C and the complementary material of the materials to be joined 11 and 11 are melted. The fourth joint portion 17 is formed by joining the lower surface of 15. When the residual heat during the friction stir welding does not reach the center in the width direction of the second brazing material 13A, the tool 20 is used to friction stir along the center in the width direction of the complementary material 15 as shown in FIG. By joining, the unmelted portion of the second brazing material 13A is melted, and the materials to be joined 11 and 11 and the complementary material 15 are completely joined.

  By the above operation, the left and right workpieces 11 and 11 are joined to each other through the first and second joining portions 12 and 14, and the respective joining surfaces 11A and 11A of the left and right workpieces 11 and 11 are joined. Steps 11B and 11B are formed on the upper portion of the upper portion, and a complementary material 15 is fitted through a second brazing material 13A laid on the bottom surface of the groove 11C made up of the step portions 11B and 11B facing each other. In addition, the joined portions of the materials to be joined 11 and 11 and the supplementary material 15 are complementary to the materials to be joined 11 and 11 along the boundary lines between the materials to be joined 11 and 11 and both sides of the supplementary material 15. A third joining portion 16 in which the material 15 is formed by friction stir welding, and each of the materials to be joined 11 and 11 and the lower surface of the complementary material 15 are interposed via a second brazing material 13A using residual heat of friction stir welding. And a fourth joint 17 joined together. , The left and right of the joining material 11 and 11, it is possible to obtain a joint structure 10B of the bonding material be integrated fully joined without leaving any unbonded portion between the complementary member 15.

  As described above, according to the present embodiment, in the case of the material to be joined 11 that cannot be joined to each other by the first brazing material 13 alone, the first brazing material 13 is used. The left and right workpieces 11 and 11 are arranged so as to be sandwiched, and the grooves 11C are formed by the left and right step portions 11B and 11B, and then the first and second are joined by friction stir welding along the first brazing material 13. The second brazing material 13A and the complementary material 15 are sequentially arranged in the groove 11C, and the friction stir welding is performed along the left and right side surfaces of the complementary material 15 to form the joints. The materials 11 and 11 and the complementary material 15 can be joined by the third and fourth joining portions 16 and 17, and the joined materials 11 and 11 are not reduced without reducing the mechanical strength of the joined structure 10B of the joined materials. Can be reliably joined.

4th Embodiment As shown in FIG. 5, for example, as shown in FIG. 5, the bonded structure 10C of the material to be bonded according to the present embodiment is vertically arranged with the first bonding portion 14 of the bonded structure 10B of the bonded material in between. Each has a structure in which third and fourth joint portions 16 and 17 are formed, and the joint structure is formed substantially symmetrical in the vertical direction. This joining structure 10C is employed when it is thicker than the thickness of the material 11 to be joined in the third embodiment.

  As shown in FIG. 5, the bonded structure 10 </ b> C of the bonded material according to the present embodiment includes a second bonded portion 14 formed at the center of the thickness of the boundary between the bonded materials 11 and 11, and a second bonded structure. The first joints 12 and 12 formed on the upper and lower ends of the part 14 and the upper and lower ends of the upper and lower first joints 12 and 12 are formed continuously via the fourth joint 17. A third joint 16. Moreover, the 3rd, 4th junction part, 16 and 17 has joined the complementary material 15 engage | inserted in the groove | channel formed in the step part of the to-be-joined materials 11 and 11 with respect to a groove | channel. The first and third joints 12 and 16 are each formed by friction stir welding. The other second and fourth joints 14 and 17 are respectively formed by the first and second brazing materials 13 and 13A that have received residual heat when the first and third joints 12 and 14 are friction stir welded. Is formed.

  In order to obtain the bonded structure 10C of the material to be bonded according to the present embodiment, for example, the first and second bonding portions 12 and 14 from the upper surface side of the materials to be bonded 11 and 11 in the same manner as the third embodiment. Then, the complementary material 15 is fitted into the groove formed by the step portion on the upper surface of the materials to be joined 11 and 11 through the second brazing material 13A, and thereafter. The complementary material 15 is friction stir welded to form the third and fourth joints 16 and 17, thereby joining the upper half of the materials to be joined 11 and 11. Next, after reversing the materials 11 and 11 to be bonded, the remaining half of the materials 11 and 11 are bonded in the same manner as in the third embodiment, and the bonded structure 10C of the material to be bonded according to the present embodiment is obtained. obtain.

  The bonded structure 10C of the bonded material obtained by the bonding method of the bonded material of the present embodiment can also be completely bonded without leaving an unbonded portion, and the mechanical strength of the bonded structure 10C of the bonded material is lowered. There is nothing to do.

  Note that the present invention is not limited to the above-described embodiments, and each component can be appropriately changed in design as necessary. For example, in each of the above embodiments, a brazing material is used as the brazing material. However, the brazing material of the present invention is not limited to a foil shape, and other forms of brazing material such as a paste or a wire. There may be. The brazing material may be a brazing material made of a metal other than silver. Moreover, if a to-be-joined material and a complementary material are metal materials which can carry out friction stir welding, it will not be restrict | limited to a specific metal material. Further, if the thickness of the material to be joined is increased, a plurality of step portions are provided on the joining surface of the material to be joined, and the respective complementary materials are fitted into the plurality of grooves having different widths composed of the plurality of step portions, It can join via a 2nd brazing material. Of course, the materials to be joined are joined by the first and second joints except for the portion to be joined by the complementary material. Further, when the brazing material is not melted by the residual heat of friction stir welding, the material to be joined may be heated. Moreover, although the said embodiment demonstrated the case where a brazing material was interposed in the same area as the whole joining surface, the brazing material may be interposed only in the part which does not reach friction stir welding. In short, as far as the friction stir welding does not reach, the joining method of the material to be joined and the joining structure of the material to be joined, which are joined via the brazing material that melts with the residual heat during friction stir welding, are included in the present invention. Is done.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used when friction stir welding is performed on thick materials to be joined.

It is a perspective view which shows one Embodiment of the joining structure of the to-be-joined material of this invention. (A)-(c) is a perspective view which shows the principal part of one Embodiment of the joining method of the to-be-joined material of this invention in order of a process. It is a perspective view which shows the joining structure of the to-be-joined material produced by other embodiment of the to-be-joined material of this invention. (A)-(c) is a perspective view which shows the principal part of other embodiment of the joining method of the to-be-joined material of this invention in order of a process, respectively. It is a perspective view which shows the joining structure of the to-be-joined material produced by further another embodiment of the to-be-joined material of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 10A, 10B Joining structure of to-be-joined material 11 To-be-joined material 11A Joining surface 11B Step part 11C Groove 12 1st joining part 13 Brazing material, 1st brazing material 13A 2nd brazing material 14 2nd joining part 15 Supplementary material 16 Third joint 17 Fourth joint

Claims (8)

  A method for joining materials to be joined, each having a thick portion that does not reach friction stir welding on the joining surface, via each joining surface, wherein each of the joining materials is joined. A step of interposing the brazing material between the surfaces, a step of bringing the bonding surfaces of the bonded materials into contact with each other via the brazing material, and a boundary between the bonded materials from one surface side of the bonded materials The members to be joined are friction stir welded along a line, and the parts to be joined are joined to each other through the brazing material using the residual heat of the friction stir welding at the portion of the joint surface where the friction stir welding does not reach. And a step of bonding the material to be bonded.   2. The method for joining materials to be joined according to claim 1, further comprising a step of friction stir welding along the boundary line of each material to be joined from the other surface side of each material to be joined.   A method for joining materials to be joined, each of which has a thick part and has a portion that does not reach friction stir welding on the joining surface, via each joining surface, wherein the joining surfaces of the respective joining materials are A step of providing a step portion on at least one of the upper and lower sides, a step of interposing a first brazing material on a joining surface other than the step portion of each of the materials to be joined, and the first brazing material The bonding surfaces other than the stepped portions of the materials to be bonded are brought into contact with each other and a groove is formed by the stepped portions, and each of the objects to be bonded is formed along a boundary line of the material to be bonded formed in the groove. A step of joining the joining material by friction stir welding and joining a portion that does not reach the friction joining by using the residual heat of the friction stir welding through the first brazing material; and a second brazing material on the bottom surface of the groove And the complementary material in the groove The step of burying and filling the groove, and at the bottom surface of the groove, at the bottom surface of the groove, at the same time, friction welding and joining the material to be joined and the complementary material along the boundary line between the side surfaces of the complementary material and the materials to be joined Joining each of the materials to be joined and the complementary material through the second brazing material using the residual heat of the friction stir welding, and a method for joining the materials to be joined .   A step of providing a plurality of stepped portions on at least one of the upper and lower sides of the bonding surface of each of the materials to be bonded and a bonding surface of each of the materials to be bonded are formed through contact with the first brazing material. A step of fitting the complementary materials sequentially into the plurality of grooves through the second brazing material to fill the grooves, and friction stir welding the at least both side surfaces of the complementary materials and the materials to be joined, respectively. And a joining structure for joining materials according to claim 3.   The materials to be joined, which are thick and have a portion where the friction stir welding does not reach the joint surfaces, are joined structures of the materials to be joined that are joined via the joint surfaces, and the joint portions of the respective materials to be joined Are the first joint formed by the friction stir welding along the boundary line of each of the materials to be joined, and the remaining portion of the friction stir welding other than the first joint is the residual heat of the friction stir welding And a second joining portion joined via a first brazing material using a bonding material.   The first joint portion is formed at two upper and lower portions from the upper and lower surfaces of each material to be joined inward, and the second joint portion is continuous between the first and second joint portions. The bonded structure for a material to be bonded according to claim 5, wherein the bonded structure is formed as follows.   At least one step is formed on at least one of the upper and lower sides of each of the bonding surfaces of each of the members to be bonded, and the second brazing material is laid on the bottom surface of the groove formed of the steps facing each other. And a joining portion of each of the materials to be joined and the complementary material is at least along the boundary line between each of the materials to be joined and both sides of the complementing material. The second brazing material in which the third joining portion in which the joining material and the complementary material are formed by friction stir welding, and the respective joined materials and the lower surface of the complementary material utilize the residual heat of the friction stir welding. And a fourth joint portion joined through the joint structure. A plurality of step portions are formed in a step shape on at least one of the upper and lower sides of the joining surface of each of the materials to be joined, and a second brazing material is interposed in a plurality of upper and lower grooves composed of the step portions facing each other. The complementary materials are respectively fitted so that they overlap each other, and the joint portion between each of the materials to be joined and each of the complementary materials is at least at the boundary line between each of the materials to be joined and both side surfaces of each of the complementary materials. Along with each of the above-mentioned materials to be joined and each of the above-mentioned other materials is formed by friction stir welding, and each of the materials to be joined and the lower surface of each of the complementary materials uses the residual heat of the friction stir welding And a fourth joint portion joined by the second brazing material, respectively. 7. The joining structure for joining materials according to claim 5.
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