JP2019046641A - Junction material of conductive member and junction method - Google Patents

Abstract

To provide a junction material of a conductive member, capable of reducing a space, corresponding to the case where an outer peripheral diameter and a form of both junction members are different, removing waste of intermediate goods, and maintaining an excellent external appearance.SOLUTION: A junction material of a conductive member, includes: a first conductive member W1 constructed by a first metal M1; a second conductive member W2 constructed by a second metal M2; and an intermediate member C1 constructed by a third metal M3 jointing both end surfaces of the first conductive member and the second conductive member. The intermediate member is constructed by a cap member having concave-like engagement parts 101 and 102 each of which is matched to at least one outer peripheral diameter of the first conductive member and the second conductive member. A junction interference L1 of the intermediate member and the first conductive member or a near-field area of the junction interference is constructed by a solid solution S1a of the first metal and the third metal. The junction interference L1 of the intermediate member and the second conductive member or the near-field area of the junction interference is constructed by a solid solution S1b of the second metal and the third metal.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a joined body and a joining method of conductive members.

  Conventionally, various techniques have been proposed in which an intermediate member is provided between conductive members made of aluminum or the like and the both are joined via the intermediate member (for example, Patent Documents 1 to 4 and the like).

Japanese Patent Application Publication No. 2003-229183 Unexamined-Japanese-Patent No. 2004-324677 JP, 2017-034776, A JP, 2017-100139, A

  However, it has been known that when joining the conductive wires together by caulking or melting through the intermediate member, various effects are exerted on the finish of the joined body, etc. by the characteristics of the intermediate member and the like according to the prior art.

  For example, in the prior art according to Patent Document 1, the intermediate member is provided between the aluminum electric wire and the copper electric wire and mechanically caulked and connected in the butting state, but the following problems occur. is there.

  That is, in order to break down a dense and hard aluminum oxide film to ensure conduction, it is difficult to obtain sufficient conduction by mechanical caulking, which causes a problem of high resistance. In addition, when the oxide film is broken by stronger caulking, there is a problem that the member such as the electric wire is reduced in surface and the original conductivity and strength of the member are lost. Furthermore, when an aluminum member having a smaller elastic force than copper or the like is crimped, there is a risk that the member with the reduced surface may be dropped from the crimped portion.

  Further, in the prior art according to Patent Document 2, an Al alloy for thermal diffusion is interposed in a gap between an iron-based shape memory alloy joint which is shrunk by heat and two metal pipes put in a butting state into this joint. Thermal diffusion bonding is performed by applying external heat, but there are the following problems.

  That is, there is a problem that it is not a technique for directly joining metal pipes, but also requires a space for a shape memory alloy.

  Further, in the prior art according to Patent Document 3, the copper conductor or the aluminum conductor for a power cable is inserted into a metal sleeve having insertion holes on both sides, and the conductor having a wedge shape is released from the metal sleeve It is preventing things, but there are the following problems.

  That is, there is a problem that it is not a technique for directly bonding metal conductors to each other, but also requires a space for a metal sleeve.

  Further, in the prior art according to Patent Document 4, when metal (M1 and M2) are butted and joined, a bonded interface is formed by solid solution of M1 and M3 and solid solution of M2 and M3 due to the presence of the third metal (M3). Is a joining technology that is configured, but has the following problems.

  That is, there is a possibility that the joining can not be performed well when the outer diameters and the shapes of the metals M1 and M2 to be butted are different. In addition, when joining stranded wires, there is a space between the strands of the bundled stranded wires, so the nominal cross-sectional area (peripheral diameter or diameter) is greater than the actual cross-sectional area (peripheral diameter or diameter) It is assumed to be large, which may cause problems in bonding due to the solid solution bonding interface.

  In addition, especially in butt bonding of aluminum (Al) strand wire and Al single wire, low melting point metal melts around the interface because zinc (Zn) as an intermediate member other than the butt interface between both members can not be completely eliminated. There is also a problem that it remains, resulting in waste of the intermediate member, and burrs, debris, and the like in the finish of the bonded body to deteriorate the appearance.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to save space, to cope with cases where outer diameters and shapes of bonding materials are different, and to eliminate waste of intermediate members, An object of the present invention is to provide a joined body and a joining method of conductive members capable of maintaining a good appearance.

  In order to achieve the above object, a joined body of conductive members according to claim 1 comprises a first conductive member composed of a first metal, a second conductive member composed of a second metal, and the second conductive member. An intermediate member composed of a third metal joining end faces of the first conductive member and the second conductive member, the intermediate member including the first conductive member and the second conductive member The cap member has a recess-like engagement portion matched to the outer diameter of at least one of the above, and the bonding interface between the intermediate member and the first conductive member or the region near the bonding interface is the first metal And a region in the vicinity of the bonding interface between the intermediate member and the second conductive member or the bonding interface is made of a solid solution of the second metal and the third metal. It is characterized by

  According to the joined body of the conductive members described in claim 1, the intermediate member is a cap member having a recess-like engagement portion matching the outer diameter of at least one of the first conductive member and the second conductive member. As it is configured, even when the outer diameters of the first conductive member and the second conductive member are different, the engaging portion of the intermediate member can be reliably engaged, and the bonding via the solid solution is more It can be done surely.

  The joined member of the conductive member according to claim 2 is characterized in that the cap member constituting the intermediate member has the recessed engaging portions on both sides of the cap member.

  Thereby, since the cap member which comprises an intermediate member has a concave-shaped engaging part in both surfaces, a 1st electrically-conductive member and a 2nd electrically-conductive member can be reliably engaged and it can fix temporarily. .

  The joined member of the conductive member according to claim 3 is characterized in that the cap member constituting the intermediate member has the depressed engaging portion only on one side of the cap member.

  Thus, since the hollow engaging portion is provided only on one side of the cap member, the first conductive member or the second conductive member can be reliably engaged and temporarily fixed.

  In the joined body of the conductive member according to claim 4, the recess-like engaging portion also serves as a positioning portion for aligning the axial centers of the first conductive member or the second conductive member as an engagement target. It features.

  As a result, by engaging the first conductive member or the second conductive member to be engaged with the recess-like engaging portion, the axial center can be aligned, and bonding can be performed more favorably. .

  The joined member of the conductive member according to claim 5 is characterized in that the recessed engaging portion is an end of the first conductive member or the second conductive member to be engaged before the bonding with the solid solution is performed. It is characterized in that it is set to a depth that can be temporarily fixed to a part.

  As a result, since the recessed engaging portion can temporarily fix the end portion of the first conductive member or the second conductive member before bonding with a solid solution, the bonding operation can be performed in a stable state.

  The joined body of the conductive member according to claim 6 forms the partition portion between the first conductive member as the engagement target and the second conductive member when bonding with the solid solution is performed. The three metals are characterized in that the thickness is set such that the entire amount can be melted and consumed.

  As a result, the waste of the intermediate member can be eliminated to reduce the cost, and a joined body of conductive members capable of maintaining a good appearance can be obtained.

  The bonded member of the conductive member according to claim 7 is characterized in that at least one of the first conductive member and the second conductive member is a stranded electric wire obtained by bundling a plurality of core wires.

  As a result, it is possible to reliably join the stranded wires having different outer peripheral diameters, or the twisted wires having different outer peripheral diameters and other types of wires.

  The bonded body of a conductive member according to claim 8 is characterized in that the third metal is made of a low melting point metal having a melting point lower than that of the first metal and the second metal.

  Thereby, a solid solution can be formed relatively easily by the temperature environment below the melting point of the first metal and the second metal and the melting point of the third metal or more.

  In the joined body of a conductive member according to claim 9, the first metal and the second metal are made of Al, the third metal is made of Zn, and the solid solution is a solid solution of Al and Zn. It is characterized by

  Thereby, a bonded body of conductive members can be obtained relatively easily.

  In the joined body of the conductive member according to claim 10, in the intermediate member, one or more protrusions are formed on the surface facing the end of the first conductive member or the second conductive member. It is characterized by

  Thereby, a solid solution can be formed at a relatively deep depth in the bonding interface or in the region near the bonding interface.

  A method of bonding a conductive member according to claim 11 comprises the steps of: preparing a first conductive member composed of a first metal and a second conductive member composed of a second metal; Engaging an end portion with a recess-shaped engaging portion according to the outer peripheral diameter of the intermediate member made of the third metal, and using the third metal at the end portion of the second conductive member Engaging the other engaging portion in the form of a recess corresponding to the outer diameter of the intermediate member, and temporarily fixing the first conductive member and the second conductive member through the intermediate member Heating in a fixed state to a predetermined temperature.

  Thereby, even when the outer diameters of the first conductive member and the second conductive member are different, the engaging portion of the intermediate member can be reliably engaged, and bonding via a solid solution is performed more reliably. be able to.

  In the method for joining conductive members according to claim 12, when one of the first conductive member and the second conductive member is a stranded wire obtained by bundling a plurality of core wires, the end portion on the stranded wire side is not The step of engaging the intermediate member may be performed prior to the step of engaging the intermediate member with the other conductive member.

  Thereby, it is possible to avoid the situation in which the twisted wires are separated and to securely bond.

  According to the present invention, space saving can be achieved, and it is possible to cope with cases where outer diameters and shapes of bonding materials are different, and waste of intermediate goods can be eliminated, and a good appearance can be maintained. Junctions and joining methods can be provided.

They are a side view (a), a front view (b), and a rear view (c) which show an intermediate member used for a joined object of an electric conduction member concerning a 1st embodiment of the present invention. It is process drawing which shows the joining process of the joined body of the electrically-conductive member which concerns on 1st Embodiment. It is process drawing which shows the continuation of the process shown in FIG. It is an image figure showing the joined state of the joined object of the electric conduction member concerning a 1st embodiment. It is a typical sectional view showing the joined state of the joined object of the electric conduction member concerning a 1st embodiment. It is a graph which shows concentration distribution of Al and Zn of the solid solution in the near field of a junction interface. It is a partially expanded sectional view which shows the principal parts, such as an intermediate member etc. which are used for the joined object of the conductive member concerning a 2nd embodiment of the present invention. It is a typical sectional view showing the joined state of the joined object of the electric conduction member concerning a 2nd embodiment. It is a side view (a) and a front view showing an intermediate member used for a joined object of electric conduction members concerning a 3rd embodiment of the present invention. It is process drawing which shows the joining process of the joined body of the electrically-conductive member which concerns on 3rd Embodiment. It is process drawing which shows the continuation of the process shown in FIG. It is an image figure showing the joined state of the joined object of the electric conduction member concerning a 3rd embodiment.

First Embodiment
Hereinafter, a method of joining conductive members according to the first embodiment of the present invention, a joined body 1A, and an intermediate member (cap member) used for the joined body 1A will be described with reference to FIGS.

  Here, FIG. 1 (a) is a side view showing an intermediate member (cap member) C1 used for the joined body 1A of the conductive members according to the first embodiment of the present invention, and FIG. 1 (b) is a front view thereof. 1 (c) is a rear view thereof, FIG. 2 and FIG. 3 are process drawings showing a bonding process of a joined body 1A of conductive members, and FIG. 4 is an image view showing a joined state of joined body 1A of conductive members, FIG. 5 is a schematic cross-sectional view showing the joined state of the joined body 1A of the conductive members.

(About the intermediate member)
First, referring to FIG. 1, an intermediate member used for the joined member 1A of the conductive members according to the first embodiment will be described.

  The intermediate member is a member for joining the end faces of a first conductive member W1 composed of a first metal M1 described later and a second conductive member W2 composed of a second metal M2, and the third metal M3 It consists of

  The intermediate member is formed of a cap member C1 having a recess-like engaging portion matching the outer diameters of the first conductive member W1 and the second conductive member W2.

  That is, as shown in FIG. 1, the cap member C1 constituting the intermediate member has recessed engaging portions 101 and 102 with different diameters on both surfaces of the cap member C1.

  In the example shown in FIG. 1, the inner diameter of the engaging portion 101 is set to D1, the inner diameter of the engaging portion 102 is set to D2, and D1> D2.

  The engaging portions 101 and 102 have a predetermined depth, and between the engaging portions 101 and 102, partition walls 105 having a predetermined thickness are formed.

  The recessed engaging portions 101 and 102 provided in the cap member C1 also serve as positioning portions for aligning the axes of the first conductive member W1 or the second conductive member W2 to be engaged.

  As a result, by engaging the first conductive member W1 or the second conductive member W2 to be engaged with the engaging portions 101 and 102 of the cap member C1, both axial centers can be aligned, and bonding is achieved. Can do better.

  In addition, the engaging portions 101 and 102 of the cap member C1 have a depth that can be temporarily fixed to the end of the first conductive member W1 or the second conductive member W2 to be engaged before joining by the solid solution. It is set to.

  Specifically, for example, when the outer diameter of the cap member C1 is about 6.7 mm, the inner diameter of the engagement portion 101 is about 5.7 mm, and the inner diameter of the engagement portion 102 is about 4.5 mm, the engagement portion 101 is , 102 are set to about 1.5 mm.

  In addition, when the concave engagement portions 101 and 102 of the cap member C1 perform bonding with a solid solution, the thickness in the longitudinal direction of the first conductive member W1 or the second conductive member W2 as the engagement target (partition wall It is desirable that the thickness of the whole of the third metal M3 constituting the thickness of the portion 105 be set to a value that can be melted and consumed.

  As a result, waste of the intermediate member (cap member C1) can be eliminated, and the cost can be reduced. Moreover, generation | occurrence | production of the burr | flash etc. after joining can be reduced and the favorable external appearance of a joined body can be maintained.

  Further, at least one of the first conductive member W1 and the second conductive member W2 can be a stranded electric wire in which a plurality of core wires are bundled.

  As a result, it becomes possible to reliably join the stranded wires having different outer peripheral diameters or the other types of wires with different outer peripheral diameters by using the intermediate member (cap member C1).

  The third metal M3 is composed of a low melting point metal having a melting point lower than that of the first metal M1 and the second metal M2.

  More specifically, the first metal M1 and the second metal M2 can be made of Al (aluminum), and the third metal M3 can be made of Zn (zinc).

  Thereby, a bonded body of conductive members can be obtained relatively easily.

(About bonding process etc.)
Next, with reference to FIGS. 2 to 5, a bonding process and the like of the conductive member bonding body 1A will be described.

  In the bonding step, first, a first conductive member W1 composed of a first metal M1 and a second conductive member W2 composed of a second metal M2 are prepared.

  In the example shown in FIG. 2, the first conductive member W <b> 1 is a stranded wire (having a diameter of about D <b> 1) in which core wires of a plurality of aluminums are bundled.

  Further, the second conductive member W2 is a single core wire of aluminum (having a diameter of about D2).

  Then, the end portion of the first conductive member W1 is pressed in the B1 direction, and engaged with one hollow engaging portion 101 provided in the intermediate member (cap member C1) formed of the third metal M3.

  As described above, the step of engaging the cap member C1 with the end on the first conductive member W1 side constituted by the stranded wire and the step of engaging the cap member C1 with the other second conductive member W2 As a result, it is possible to avoid the situation in which the twisted wires break up and ensure reliable bonding.

  Then, the end of the second conductive member W2 is pressed in the B2 direction to engage with the other engaging portion 102 of the cap member C1.

  As a result, as shown in FIG. 3, the first conductive member W1 and the second conductive member W2 are temporarily fixed via the cap member C1.

  Then, in this state, the region including the temporary fixing portion is heated to a predetermined temperature.

  Although the heating method is not particularly limited, for example, predetermined power is supplied between the first conductive member W1 and the second conductive member W2 to heat by resistance heat generation, or by a high frequency induction heating device or the like. It can be heated.

  In addition, it may be made to press in B1 and B2 direction at the time of heating.

  Thereby, as shown to the image figure of FIG. 4, 1st electrically-conductive member W1 and 2nd electrically-conductive member W2 are joined by a solid solution.

  Here, FIG. 5 is a schematic cross-sectional view showing a bonding state of the joined body of the conductive members according to the first embodiment.

  As shown in FIG. 5, Zn constituting the intermediate member (cap member C1) shown in FIG. 3 is melted and then solidified to join the end portions of the first conductive member W1 and the second conductive member W2 from the outside. Do.

  On the other hand, before the bonding, the bonding interface L1 between the bonding portion C1a and the first conductive member W1, which is formed by the partition 105, or the region near the bonding interface L1 is Al which is the first metal M1 and the third metal It is comprised by solid solution S1a with Zn which is M3.

  Further, in the region near the bonding interface L1 of the bonding portion C1a formed of the partition wall portion 105 and the first conductive member W1 before bonding or the bonding interface L1, Al as the second metal M2 and the third metal are used. It is comprised by solid solution S1b with Zn which is M3.

  The concentration distribution of Al and Zn of the solid solution in the region near the bonding interface L1 is as shown in the graph of FIG.

  Here, FIG. 6 is a graph showing the concentration distribution of Al and Zn in solid solution in the region near the bonding interface L1.

  In this graph, the horizontal axis indicates the distance (μm) with the bonding interface L1 as the reference point “0”, and the vertical axis indicates the concentrations of Al and Zn.

  Thus, as schematically shown in FIG. 5, in the junction interface L1 or in a region near the junction interface L1, the concentration of Zn decreases as it departs from the junction interface L1, and conversely, the concentration of Al as it departs from the junction interface L1. A solid solution S1a, S1b in the form of gradation is formed.

  As described above, according to the joined member 1A of the conductive members according to the present embodiment, the intermediate member is in the shape of a recess that matches the outer diameter of at least one of the first conductive member W1 and the second conductive member W2. Since the first conductive member W1 and the second conductive member W2 have different outer diameters, the engaging portion 101 of the cap member C1 has , 102 can be reliably engaged, and bonding via a solid solution can be performed more reliably.

  Further, since the cap member C1 has recessed engaging portions 101 and 102 on both surfaces, the first conductive member W1 and the second conductive member W2 can be reliably engaged and temporarily fixed.

  The recessed engaging portions 101 and 102 also serve as positioning portions for aligning the axes of the first conductive member W1 and the second conductive member W2 to be engaged. As a result, by engaging the first conductive member W1 and the second conductive member W2 to be engaged with the engaging portions 101 and 102, the axial centers can be aligned, and bonding can be performed better. Can.

  Also, the engaging portions 101 and 102 are set to a depth that can be temporarily fixed to the end portions of the first conductive member W1 and the second conductive member W2 to be engaged before joining by the solid solution. There is.

  As a result, since the engaging portions 101 and 102 can temporarily fix the end portions of the first conductive member W1 and the second conductive member W2 before bonding by the solid solution, the bonding operation can be performed in a stable state. it can.

  In addition, when bonding with a solid solution is performed, the entire third metal M3 constituting the partition between the first conductive member W1 and the second conductive member W2 to be engaged is melted and consumed. It can be set to the thickness obtained. In this case, waste of the intermediate member (cap member C1) can be eliminated to reduce the cost, and a joined member A1 of conductive members capable of maintaining a good appearance can be obtained.

  Moreover, joined body A1 shown in FIG. 3 etc. is using the 1st electrically-conductive member W1 as the twist electric wire which bundled several core wire W1a. The second conductive member W2 may also be a stranded wire with the same configuration.

  As a result, it is possible to reliably join the stranded wires having different outer peripheral diameters, or the stranded wires having different outer peripheral diameters and other types of wires (single core wire etc.).

Second Embodiment
Next, with reference to FIG. 7 and FIG. 8, the joined member 1B of the conductive member according to the second embodiment of the present invention will be described.

  Here, FIG. 7 is a partially enlarged cross-sectional view showing the main parts of the intermediate member and the like used for the joined body 1B of the conductive members according to the second embodiment, and FIG. 8 is a conductive according to the second embodiment. It is a typical sectional view showing the joined state of joined object 1B of a member.

  As shown in FIG. 7, the cap member C2 as an intermediate member used for the joined body 1B of the conductive members according to the second embodiment has a surface opposite to the first conductive member W1 formed of a stranded wire, One or more protrusions 111 are formed.

  As a result, as shown in FIG. 8, the solid solution S1a can be formed at a relatively deep depth in the bonding interface L1 or a region near the bonding interface L2.

  That is, Zn or a solid solution intrudes also into the gap 115 of the core wire W1a of the first conductive member W1, and the core wires W1a can be strongly joined.

  When the second conductive member W2 is formed of a stranded wire, the protrusion 111 may be formed on the opposing surface of the second conductive member W2.

  Further, as in the first embodiment, by changing the diameter of the engaging portion of the cap member C2, stranded wires having different outer peripheral diameters or stranded wires having different outer peripheral diameters and other types of wires (single core wire etc.) It is possible to make bonding with the

Third Embodiment
A joined body 1C of conductive members according to a third embodiment of the present invention will be described with reference to FIGS. 9 to 12.

  Here, FIG. 9 (a) is a side view showing an intermediate member (cap member C3) used for the bonded body 1C of the conductive members according to the third embodiment of the present invention, and FIG. 9 (b) is a front view thereof. 10 and 11 are process diagrams showing the bonding process of the joined body 1C of the conductive members, and FIG. 12 is an image view showing the joined state of the joined body 1C of the conductive members.

(About the intermediate member)
First, with reference to FIG. 9, the intermediate member used for the joined body 1C of the conductive members according to the third embodiment will be described.

  The intermediate member is a member for joining the end faces of the first conductive member W1 composed of the first metal M1 and the second conductive member W2 composed of the second metal M2, and the third metal M3 It consists of

  This intermediate member is a cap member C3 having a recess-like engaging portion 110 that matches the outer diameter (D3, for example, about 5.7 mm) of the first conductive member W1 only on the first conductive member W1 side. It is configured.

  The engaging portion 110 has a predetermined depth, and a wall portion 120 having a predetermined thickness (for example, about 0.4 mm) is formed.

  Moreover, the engaging part 110 of the cap member C3 is set to the depth which can be temporarily fixed to the edge part of 1st electrically-conductive member W1 as engagement object, before joining by a solid solution.

  Moreover, as for the thickness of the wall part 120 of the cap member C3, it is desirable to set to the thickness which the whole quantity of the 3rd metal M3 which comprises the cap member C3 can fuse | melt and be consumed.

  Thereby, the waste of the intermediate member (cap member C3) can be eliminated, and the cost can be reduced. Moreover, generation | occurrence | production of the burr | flash etc. after joining can be reduced and the favorable external appearance of a joined body can be maintained.

  Further, as in the first embodiment and the like, the third metal M3 is composed of a low melting point metal having a melting point lower than that of the first metal M1 and the second metal M2. More specifically, the first metal M1 and the second metal M2 can be made of Al (aluminum), and the third metal M3 can be made of Zn (zinc).

  Thereby, a bonded body of conductive members can be obtained relatively easily.

(About bonding process etc.)
Next, with reference to FIG. 10 and FIG. 11, the bonding process etc. of the joined body 1C of the conductive member will be briefly described.

  In the bonding step, first, a first conductive member W1 composed of a first metal M1 and a second conductive member W2 composed of a second metal M2 are prepared.

  In the example shown in FIG. 10, the first conductive member W1 is a stranded wire (having a diameter of about D3) obtained by bundling a plurality of core wires of aluminum.

  Further, the second conductive member W2 is a single core wire of aluminum (with a diameter of, for example, about D2 shown in the second embodiment).

  Then, the end portion of the first conductive member W1 is pressed in the B1 direction to engage with the depressed engaging portion 110 provided in the intermediate member (cap member C3) formed of the third metal M3.

  As described above, the step of engaging the cap member C1 with the end portion on the first conductive member W1 side constituted by the stranded wire is earlier than the step of bringing the other second conductive member W2 into contact with the cap member C3. As a result, it is possible to avoid the situation in which the twisted wires break up and ensure reliable bonding.

  Then, the end of the second conductive member W2 is pressed in the B2 direction to abut on the surface 120a of the cap member C3.

  As a result, as shown in FIG. 11, in a state in which the first conductive member W1 is temporarily fixed via the cap member C3, the second conductive member W2 is in a contact state.

  Then, in this state, the region including the temporary fixing portion is heated to a predetermined temperature.

  Although the heating method is not particularly limited, for example, predetermined power is supplied between the first conductive member W1 and the second conductive member W2 to heat by resistance heat generation, or by a high frequency induction heating device or the like. It can be heated.

  In addition, it may be made to press in B1 and B2 direction at the time of heating.

  Thereby, as shown to the image figure of FIG. 12, the 1st electrically-conductive member W1 and the 2nd electrically-conductive member W2 are joined by a solid solution.

  The bonding principle and the like of the bonded member 1C of the conductive member are the same as the bonded member 1A of the conductive member according to the first embodiment.

  As described above, according to the joined body 1C of the conductive members according to the present embodiment, the intermediate member is the cap member C3 having the recessed engaging portion 110 matched to the outer diameter of the first conductive member W1. Therefore, even if the outer diameters of the first conductive member W1 and the second conductive member W2 are different, they can be reliably engaged via the cap member C3, and bonding via a solid solution is performed. Can be done more reliably.

  The joined member 1C of the conductive member can exhibit the same effects as the joined member 1A of the conductive member according to the first embodiment.

  Further, similarly to the joined member 1B of the conductive member according to the second embodiment, one or more protrusions 111 are formed on the surface of the cap member C3 facing the first conductive member (twisted wire) W1. You may do so. In that case, it is possible to bond more firmly.

(Others)
Although the case where Al (aluminum) is used as a 1st metal which comprises the 1st electrically-conductive member M1 and a 2nd metal which comprises the 2nd electrically-conductive member M2 was shown in embodiment mentioned above, it does not restrict to this At least one of the first metal and the second metal can be Cu (copper) or the like.

1A to 1C: Bonded body of conductive member 30: connector terminal 101, 102, 110: engaging portion 105: partition portion 111: projection portion 120: wall portion C1 to C3: intermediate member (cap member)
L1 junction interface M1 first metal M2 second metal M3 third metal S1a, S1b solid solution W1 first conductive member (twisted wire)
W2: second conductive member W1a: core wire 111: projection 115: gap

Claims (12)

A first conductive member made of a first metal;
A second conductive member made of a second metal;
An intermediate member composed of a third metal joining end faces of the first conductive member and the second conductive member;
Including
The intermediate member is formed of a cap member having a recess-like engaging portion that matches the outer diameter of at least one of the first conductive member and the second conductive member.
A junction interface between the intermediate member and the first conductive member or a region near the junction interface is formed of a solid solution of the first metal and the third metal,
A bonded body of a conductive member, wherein a bonding interface between the intermediate member and the second conductive member or a region near the bonding interface is formed of a solid solution of the second metal and the third metal.   The joined member of a conductive member according to claim 1, wherein the cap member constituting the intermediate member has the recessed engaging portions on both sides of the cap member.   The joined member of a conductive member according to claim 1, wherein the cap member constituting the intermediate member has the recessed engaging portion only on one side of the cap member.   The concave-shaped engaging portion also serves as a positioning portion for aligning the axial centers of the first conductive member or the second conductive member to be engaged. A bonded body of the conductive member according to any one of the items 1 to 4.   The recessed engaging portion is set to a depth that can be temporarily fixed to the end of the first conductive member or the second conductive member to be engaged before the bonding with the solid solution is performed. The joined member of the conductive member according to any one of claims 2 to 4, characterized in that.   When bonding with the solid solution, the entire amount of the third metal constituting the partition between the first conductive member and the second conductive member to be engaged may be consumed by melting. It sets to thickness, The joined body of the electrically-conductive member in any one of the Claims 1-5 characterized by the above-mentioned.   The conductive member according to any one of claims 1 to 6, wherein at least one of the first conductive member and the second conductive member is a stranded wire in which a plurality of core wires are bundled. Zygote.   The conductive member according to any one of claims 1 to 7, wherein the third metal is composed of a low melting point metal having a melting point lower than that of the first metal and the second metal. Zygote. The first metal and the second metal are made of Al,
The third metal is made of Zn,
The joined body of a conductive member according to any one of claims 1 to 7, wherein the solid solution is a solid solution of Al and Zn.   In the intermediate member, one or more protrusions are formed on the surface facing the end of the first conductive member or the second conductive member. A bonded body of the conductive member according to any one of 9. Providing a first conductive member composed of a first metal and a second conductive member composed of a second metal;
Engaging one recessed engaging portion provided in the intermediate member made of the third metal with the end portion of the first conductive member;
Engaging the other engaging portion of the intermediate member with the end of the second conductive member;
Heating to a predetermined temperature in a state in which the first conductive member and the second conductive member are temporarily fixed via the intermediate member;
And a method of joining conductive members.   When one of the first conductive member and the second conductive member is a stranded wire obtained by bundling a plurality of core wires, the step of engaging the intermediate member with the end on the stranded wire side is the other conductive The method according to claim 11, wherein the step of engaging the intermediate member with the member is performed prior to the step of engaging the intermediate member.