JP2023127033A - Manufacturing method of resistive element and resistive element obtained by the same - Google Patents

Abstract

To provide a manufacturing method of a resistive element capable of bonding a resistor and a terminal in a satisfactory state.SOLUTION: A first metal member 10 consisting of a copper-manganese-nickel alloy for general electric resistance and a second metal member 20 consisting of aluminum are prepared. The first metal member 10 and the second metal member 20 are adjacently disposed without a gap. In a state where a rotary tool 30 is inserted to the second metal member 20 in such a manner that an outer peripheral edge of the rotary tool 30 is substantially matched with a boundary 3 of the first metal member 10 and the second metal member 20, the rotary tool 30 is moved along the boundary 3, thereby providing a resistive element 1 in which the first metal member 10 and the second metal member 20 are bonded by frictional stir bonding, the first metal member 10 is defined as a resistive element main body 11, the second metal member 20 is defined as an electrode part 21 and the resistive element main body 11 and the electrode part 21 are bonded via an AL2Cu compound layer.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for manufacturing a resistance element that can be used, for example, in a shunt resistor, and the resistance element obtained thereby.

Electric vehicles and smart meters, which have become popular in recent years, can draw large currents ranging from several tens of amperes to several hundred amperes. Such large currents can be measured quickly, accurately, and inexpensively by using a shunt resistor that converts the current into voltage. Therefore, with the spread of electric vehicles and smart meters, demand for shunt resistors is increasing.

Manganin (registered trademark), whose resistance value has low temperature dependence, is used as a resistance element in such a shunt resistor. A terminal made of metal such as copper is welded to the resistive element to form a resistor.

The applicant is aware of the following Patent Documents 1 and 2 as prior art documents regarding such a resistive element and its manufacturing method.

Japanese Patent Application Publication No. 2007-220714 Patent No. 6671129

The above-mentioned Patent Document 1 discloses a technology related to a resistor, and includes the following description.
[0017]
In the above configuration, the resistor 11 is made of a metal plate made of copper nickel, nichrome, manganin, or the like. The metal terminal 12 is made of a metal having higher electrical conductivity than the resistor 11, such as gold, silver, copper, aluminum, etc., and has a plate shape. It is formed by being bent into a U-shape so as to sandwich both ends. Furthermore, the metal terminal 12 is configured to be electrically connected to at least the upper and lower surfaces of the resistor 11.

The above-mentioned Patent Document 2 discloses a technique related to a method for manufacturing a shunt resistor, and includes the following description.
[0002]
2. Description of the Related Art A resistor is known in which a long plate-shaped metal plate serving as an electrode is bonded to a long plate-shaped resistor, and a predetermined shape is cut out from the bonded plate material (welded plate material). In this case, the resistor is usually a manganin metal alloy such as Cu (copper), Mn (manganese), Ni (nickel), etc., and the terminal plate is usually a copper plate. A method using an electron beam is known as a means for welding such dissimilar metals. This method of using an electron beam requires a vacuum chamber and vacuum equipment because it is necessary to irradiate the joint (the butt part between the resistor and the terminal plate) with the electron beam in a vacuum, making the welding equipment large and expensive. There was also the problem of poor welding efficiency.
[0003]
Therefore, it has been proposed to perform welding using a laser beam instead of an electron beam. Patent Document 1 discloses a method of irradiating a laser beam from the outside onto the abutting end surfaces of a long plate-shaped resistor and a terminal plate to melt and join the contact portion between the resistor and the terminal plate. Among this type of resistors, so-called shunt resistors have been widely used in recent years. This shunt resistor is widely used to detect current in electronic equipment such as automobiles, but in this case, it is desirable that it has a small resistance value and can withstand large currents (large power rating). It is rare.

The above Patent Document 1 discloses a resistor formed by bending a resistor 11 into a U-shape so as to sandwich a metal terminal 12 between both ends thereof. It is described that Manganin (registered trademark) is used as the resistor 11, and copper or aluminum is used as the metal that constitutes the metal terminal 12.

The above Patent Document 2 discloses a method of manufacturing a shunt resistor by welding a copper plate to a resistor made of a manganin metal alloy. As means for performing the above-mentioned welding, a method using an electron beam and a method using a laser beam are described.

The typical configuration of a resistor is to combine a Manganin (registered trademark) resistor with a copper metal terminal. A resistor that combines Manganin (registered trademark) and copper has a very small resistance temperature coefficient at room temperature, little change in resistance value or resistance temperature coefficient over time, low thermal power to copper, and can be processed by rolling or fine wire processing. This is because it has advantages such as easy brazing and soldering. On the other hand, it is known to have disadvantages such as poor corrosion resistance, slight processing affects its properties, temperature coefficient of resistance near room temperature is not linear, and a deteriorated layer is easily formed on the surface by heating.

In addition, in the above resistors, Manganin (registered trademark) and copper were mainly joined by electron beam welding, but electron beam welding requires a vacuum environment, and laser beam welding has also been put into practical use. There is still a problem that the equipment is large and expensive.

Patent Document 1 describes that aluminum is used as the metal terminal 12, and the resistor 11 is sandwiched between the metal terminals 12 bent into a U-shape for mechanical connection. Therefore, structural defects are inevitable at the bonding interface between the metal terminal 12 and the resistor 11, and there is a possibility that the characteristics of the various resistors described above cannot be obtained.

The present invention has been made with the following objectives in order to solve the above problems.
The present invention provides a method for manufacturing a resistance element in which a resistor and a metal terminal can be bonded in an extremely good condition with few defects, and a resistance element obtained thereby.

In order to achieve the above object, the method for manufacturing a resistance element according to claim 1 employs the following configuration.
Prepare a first metal member made of a copper-manganese-nickel alloy for general electrical resistance and a second metal member made of aluminum,
the first metal member and the second metal member are arranged adjacent to each other so that there is substantially no gap;
With the rotary tool inserted into the second metal member, the rotary tool is moved along the boundary so that the outer peripheral edge of the rotary tool substantially coincides with the boundary between the first metal member and the second metal member. joining the first metal member and the second metal member by friction stir welding,
A resistance element is obtained in which the first metal member is used as a resistance element body, the second metal member is used as an electrode part, and the resistance element main body and the electrode part are joined via an AL ₂ Cu compound layer.

The method for manufacturing a resistance element according to the second aspect employs the following configuration in addition to the configuration according to the first aspect.
disposing an auxiliary metal material that covers at least a region along the boundary between the first metal member and the second metal member;
The friction stir welding is performed by inserting the rotary tool into the second metal member in a region where the auxiliary metal material is present.

The method for manufacturing a resistance element according to claim 3 employs the following configuration in addition to the configuration described in claim 2.
The auxiliary metal material is arranged above the first metal member and the second metal member that are arranged adjacent to each other,
The friction stir welding is performed by inserting the rotary tool into the second metal member from above the auxiliary metal member.

The method for manufacturing a resistance element according to claim 4 employs the following configuration in addition to the configuration described in claim 2 or 3.
The auxiliary metal material is arranged below the first metal member and the second metal member that are arranged adjacent to each other,
The friction stir welding is performed by inserting the rotary tool into the second metal member from above the second metal member to the auxiliary metal member.

The method for manufacturing a resistance element according to claim 5 employs the following configuration in addition to the configuration described in any one of claims 2 to 4.
The auxiliary metal material is made of substantially the same aluminum as the second metal member.

The method for manufacturing a resistance element according to claim 6 employs the following configuration in addition to the configuration described in any one of claims 1 to 5.
The copper-manganese-nickel alloy has Mn: 10 to 13% by weight, Ni: 1 to 4% by weight, and the balance is Cu, and Cu+Ni+Mn is 98% by weight or more.

In order to achieve the above object, the resistance element according to claim 7 employs the following configuration.
A resistance element body made of a copper-manganese-nickel alloy for general electrical resistance,
an electrode portion made of aluminum bonded to the resistive element body;
The resistive element body and the electrode portion are bonded to each other via an AL ₂ Cu compound layer.

The resistance element according to claim 8 employs the following configuration in addition to the configuration described in claim 8.
The copper-manganese-nickel alloy has Mn: 10 to 13% by weight, Ni: 1 to 4% by weight, and the balance is Cu, and Cu+Ni+Mn is 98% by weight or more.

In the method for manufacturing a resistance element according to the first aspect, first, a first metal member made of a copper-manganese-nickel alloy for general electrical resistance and a second metal member made of aluminum are prepared. Then, the first metal member and the second metal member are placed adjacent to each other so that there is substantially no gap between them. Next, the rotary tool is inserted into the second metal member so that the outer peripheral edge of the rotary tool substantially coincides with the boundary between the first metal member and the second metal member, and the rotary tool is inserted into the second metal member. By moving the metal member along the boundary, the first metal member and the second metal member are joined by friction stir welding. Thereby, a resistance element is obtained in which the first metal member serves as the resistance element body and the second metal member serves as the electrode portion.
Due to the friction stir welding, plastic flow occurs in the second metal member and the second metal member comes into close contact with the boundary with the first metal member, thereby joining the first metal member and the second metal member. At this time, plastic flow occurs only in the second metal member, and almost no plastic flow occurs in the first metal member. Further, since the resistive element main body and the electrode portion are bonded via the AL ₂ Cu compound layer, an extremely good bonding state with few defects such as mixing of two types of metals and voids can be obtained. In other words, the formation of the AL ₂ Cu compound layer causes aluminum and copper to be metallically bonded. Moreover, the AL ₂ Cu compound layer is formed in the form of a film at the bonding interface without mixing the two types of metals, and the electrical resistance value of the bonded portion is stabilized. Furthermore, if the thickness of the AL ₂ Cu compound layer is made as thin as about 1 micron, the bonded portion becomes difficult to break brittlely.

In the method for manufacturing a resistance element according to a second aspect of the present invention, an auxiliary metal material is arranged to cover at least a region along a boundary between the first metal member and the second metal member. Then, the friction stir welding is performed by inserting the rotary tool into the second metal member in the area where the auxiliary metal material is present.
By doing this, even if the material is scattered due to intense plastic flow, the auxiliary metal material joins the plastic flow to compensate for the material, and as a result, the occurrence of voids can be significantly reduced. . Therefore, it is possible to obtain an extremely good bonding state with few defects such as coexistence of two types of metals and voids. Further, even if the first metal member and the second metal member are thin plates (for example, about 2 mm or less), the first metal member and the second metal member are held by the auxiliary metal member, thereby providing a good performance. A bonded state is obtained.

In the method for manufacturing a resistance element according to a third aspect of the present invention, the auxiliary metal material is arranged above the first metal member and the second metal member that are arranged adjacent to each other. Then, the friction stir welding is performed by inserting the rotary tool into the second metal member from above the auxiliary metal member.
By doing this, even if the material is scattered due to intense plastic flow, the auxiliary metal material joins the plastic flow to compensate for the material, and as a result, the occurrence of voids can be significantly reduced. . Therefore, it is possible to obtain an extremely good bonding state with few defects such as coexistence of two types of metals and voids. Further, even if the first metal member and the second metal member are thin plates (for example, about 2 mm or less), the first metal member and the second metal member are held by the auxiliary metal member, thereby providing a good performance. A bonded state is obtained.

In the method for manufacturing a resistance element according to a fourth aspect of the present invention, the auxiliary metal material is arranged below the first metal member and the second metal member that are arranged adjacent to each other. Then, the friction stir welding is performed by inserting the rotary tool into the second metal member from above the second metal member to the auxiliary metal material.
By doing this, even if the material is scattered due to intense plastic flow, the auxiliary metal material joins the plastic flow to compensate for the material, and as a result, the occurrence of voids can be significantly reduced. . Therefore, it is possible to obtain an extremely good bonding state with few defects such as coexistence of two types of metals and voids. Further, even if the first metal member and the second metal member are thin plates (for example, about 2 mm or less), the first metal member and the second metal member are held by the auxiliary metal member, thereby providing a good performance. A bonded state is obtained.

In the method for manufacturing a resistance element according to a fifth aspect of the present invention, the auxiliary metal material is made of substantially the same aluminum as the second metal member.
By doing this, even if the material is scattered due to intense plastic flow, the auxiliary metal material joins the plastic flow to compensate for the material, and as a result, the occurrence of voids can be significantly reduced. . Therefore, it is possible to obtain an extremely good bonding state with few defects such as coexistence of two types of metals and voids.

The method for manufacturing a resistance element according to claim 6, wherein the copper-manganese-nickel alloy contains Mn: 10 to 13% by weight, Ni: 1 to 4% by weight, and the balance is Cu, and Cu+Ni+Mn is 98% by weight or more. Therefore, the resistance element can be constructed from a copper-manganese-nickel alloy that is available on the market, and one of constant quality can be obtained at low cost.

A resistive element according to a seventh aspect of the present invention includes a resistive element body made of a copper-manganese-nickel alloy for general electrical resistance, and an electrode part made of aluminum joined to the resistive element body. The resistive element body and the electrode portion are bonded to each other via an AL ₂ Cu compound layer. Therefore, it is possible to obtain an extremely good bonding state with few defects such as coexistence of two types of metals and voids. In other words, the formation of the AL ₂ Cu compound layer causes aluminum and copper to be metallically bonded. Moreover, the AL ₂ Cu compound layer is formed in the form of a film at the bonding interface without mixing the two types of metals, and the electrical resistance value of the bonded portion is stabilized. Furthermore, if the thickness of the AL ₂ Cu compound layer is made as thin as about 1 micron, the bonded portion becomes difficult to break brittlely.

In the resistor element according to claim 8, the copper-manganese-nickel alloy contains Mn: 10 to 13% by weight, Ni: 1 to 4% by weight, and the balance is Cu, and Cu+Ni+Mn is 98% by weight or more.
Therefore, the resistor element can be constructed from a copper-manganese-nickel alloy that is available on the market, and a resistor element of constant quality can be obtained at a low cost.

1 is a diagram illustrating a first embodiment of a method for manufacturing a resistance element of the present invention. FIG. It is a figure explaining the resistance element obtained by the said method. It is a figure explaining 2nd Embodiment of the manufacturing method of the resistance element of this invention. A cross-sectional micrograph of a resistance element of an example is shown.

Next, a mode for carrying out the present invention will be explained.

[Process]
FIG. 1 is a diagram illustrating a first embodiment of the method for manufacturing a resistance element of the present invention. (A) shows the state seen from the front, and (B) shows the state seen from above.

In this manufacturing method, first, a first metal member 10 made of a copper-manganese-nickel alloy for general electrical resistance and a second metal member 20 made of aluminum are prepared.

The copper-manganese-nickel alloy constituting the first metal member 10 has Mn: 10 to 13% by weight, Ni: 1 to 4% by weight, and the balance is Cu, and preferably Cu+Ni+Mn is 98% by weight or more. Can be used. For example, it is possible to use what is defined as copper manganese GCM44 for general electrical resistance in JIS C 2532, or what is distributed as Manganin (registered trademark).

As the aluminum constituting the first metal member 10, various aluminum-based materials (including alloys) used as terminal materials for electrical connections can be used.

In the illustrated example, the first metal member 10 and the second metal member 20 both have a quadrilateral shape (square or rectangle).

Next, the first metal member 10 and the second metal member 20 are placed adjacent to each other so that there is substantially no gap between them. In the illustrated example, the first metal member 10 and the second metal member 20, each of which is a rectangular plate, are placed on an anvil 40 and arranged with their sides butted against each other. A boundary 3 is formed where the first metal member 10 and the second metal member 20 abut against each other.

The anvil 40 has a rectangular shape that is slightly larger than the state in which the first metal member 10 and the second metal member 20 are butted together. In this example, a gap 41 is formed in the anvil 40 along the boundary 3 between the first metal member 10 and the second metal member 20 that are butted against each other.

Next, the rotary tool 30 is inserted into the second metal member 20 such that the outer peripheral edge of the rotary tool 30 substantially coincides with the boundary 3 between the first metal member 10 and the second metal member 20. By moving the rotary tool 30 along the boundary 3, the first metal member 10 and the second metal member 20 are joined by friction stir welding.

FIG. 2 shows a state in which a pair of second metal members 20 are joined to both sides of the first metal member 10 by the above-described friction stir welding. (A) is a plan view, and (B) is a front view.

In this way, it is possible to obtain the resistance element 1 in which the first metal member 10 is the resistance element main body 11 and the second metal member 20 is the electrode part 21.

As described above, the first metal member 10 constituting the resistance element main body 11 is made of a copper-manganese-nickel alloy for general electrical resistance. Preferably, the above-mentioned copper-manganese-nickel alloy may be one in which Mn: 10 to 13% by weight, Ni: 1 to 4% by weight, and the balance is Cu, and Cu+Ni+Mn is 98% by weight or more. The second metal member 20 constituting the electrode section 21 is made of aluminum. Then, due to the action of friction stirring, the copper in the first metal member 10 (copper-manganese-nickel alloy) and the second metal member 20 (aluminum) react to form a compound layer at the interface between the two. . Thereby, the resistive element main body 11 and the electrode section 21 are joined via the AL ₂ Cu compound layer.

[Effects of the first embodiment]
In the method for manufacturing a resistance element according to the first embodiment, first, a first metal member 10 made of a copper-manganese-nickel alloy for general electrical resistance and a second metal member 20 made of aluminum are prepared. Next, the first metal member 10 and the second metal member 20 are placed adjacent to each other so that there is substantially no gap between them. Next, the rotary tool 30 is inserted into the second metal member 20 so that the outer peripheral edge of the rotary tool 30 substantially coincides with the boundary 3 between the first metal member 10 and the second metal member 20. By moving the rotary tool 30 along the boundary 3, the first metal member 10 and the second metal member 20 are joined by friction stir welding. Thereby, a resistance element is obtained in which the first metal member 10 is used as the resistance element body 11 and the second metal member 20 is used as the electrode part 21.
Through the friction stir welding, plastic flow occurs in the second metal member 20 and it comes into close contact with the boundary 3 with the first metal member 10, thereby joining the first metal member 10 and the second metal member 20. At this time, plastic flow occurs only in the second metal member 20, and almost no plastic flow occurs in the first metal member 10. Furthermore, since the resistive element main body 11 and the electrode portion 21 are bonded via the AL ₂ Cu compound layer, an extremely good bonding state can be obtained with few defects such as mixing of two types of metals and voids. . In other words, the formation of the AL ₂ Cu compound layer causes aluminum and copper to be metallically bonded. Moreover, the AL ₂ Cu compound layer is formed in the form of a film at the bonding interface without mixing the two types of metals, and the electrical resistance value of the bonded portion is stabilized. Furthermore, if the thickness of the AL ₂ Cu compound layer is made as thin as about 1 micron, the bonded portion becomes difficult to break brittlely.

In the method for manufacturing the resistance element of the first embodiment, the copper-manganese-nickel alloy contains Mn: 10 to 13% by weight, Ni: 1 to 4% by weight, and the balance is Cu, and Cu+Ni+Mn is 98% by weight or more. Therefore, the resistance element can be constructed from a copper-manganese-nickel alloy that is available on the market, and one of constant quality can be obtained at low cost.

The resistance element of the first embodiment includes a resistance element body 11 made of a copper-manganese-nickel alloy for general electrical resistance, and an electrode part 21 made of aluminum bonded to the resistance element body 11. There is. The resistive element main body 11 and the electrode section 21 are bonded to each other via an AL ₂ Cu compound layer. Therefore, it is possible to obtain an extremely good bonding state with few defects such as coexistence of two types of metals and voids. In other words, the formation of the AL ₂ Cu compound layer causes aluminum and copper to be metallically bonded. Moreover, the AL ₂ Cu compound layer is formed in the form of a film at the bonding interface without mixing the two types of metals, and the electrical resistance value of the bonded portion is stabilized. Furthermore, if the thickness of the AL ₂ Cu compound layer is made as thin as about 1 micron, the bonded portion becomes difficult to break brittlely.

In the resistance element of the first embodiment, the copper-manganese-nickel alloy has Mn: 10 to 13% by weight, Ni: 1 to 4% by weight, and the balance is Cu, and Cu+Ni+Mn is 98% by weight or more.
Therefore, the resistor element can be constructed from a copper-manganese-nickel alloy that is available on the market, and a resistor element of constant quality can be obtained at a low cost.

FIG. 3 is a diagram illustrating a second embodiment of the method for manufacturing a resistance element of the present invention. (A) is the first example, (B) is the second example, and (C) is the third example.

In the second embodiment, auxiliary metal members 50A/50B are arranged to cover at least a region along the boundary 3 between the first metal member 10 and the second metal member 20. Then, the friction stir welding is performed by inserting the rotary tool 30 into the second metal member 20 in the region where the auxiliary metal materials 50A/50B are present.

By doing this, even if the material is scattered due to intense plastic flow, the auxiliary metal material joins the plastic flow to compensate for the material, and as a result, the occurrence of voids can be significantly reduced. . Therefore, it is possible to obtain an extremely good bonding state with few defects such as coexistence of two types of metals and voids.

In the second embodiment, the auxiliary metal material 50A/50B can be made of substantially the same aluminum as the second metal member 20.

By doing this, even if the material is scattered due to intense plastic flow, the auxiliary metal material joins the plastic flow to compensate for the material, and as a result, the occurrence of voids can be significantly reduced. . Therefore, it is possible to obtain an extremely good bonding state with few defects such as coexistence of two types of metals and voids.

FIG. 3(A) is a first example of the second embodiment.

In this example, the auxiliary metal member 50A is placed above the first metal member 10 and the second metal member 20 that are arranged adjacent to each other. Further, an auxiliary metal material 50B is also arranged below the first metal member 10 and the second metal member 20. The lower auxiliary metal material 50B is fitted into a groove 42 formed in the anvil 40A. Then, the rotary tool 30 is inserted into the second metal member 20 from above the auxiliary metal material 50A to the auxiliary metal material 50B, and the friction stir welding is performed.

FIG. 3(B) is a second example of the second embodiment.

In this example, the auxiliary metal member 50A is placed above the first metal member 10 and the second metal member 20, which are arranged adjacent to each other, and the rotary tool 30 is moved from above the auxiliary metal member 50A to the second metal member 20. The above-mentioned friction stir welding is performed by inserting it into the two metal members 20.

FIG. 3(C) is a third example of the second embodiment.

In this example, the auxiliary metal member 50B is arranged below the first metal member 10 and the second metal member 20 which are arranged adjacent to each other, and the rotary tool 30 is inserted from above the second metal member 20. The friction stir welding is performed by inserting the auxiliary metal member 50B into the second metal member 20.

[Effects of the second embodiment]
In the method for manufacturing a resistance element of the second embodiment, auxiliary metal materials 50A/50B are arranged to cover at least a region along the boundary 3 between the first metal member 10 and the second metal member 20. Then, the friction stir welding is performed by inserting the rotary tool 30 into the second metal member 20 in the region where the auxiliary metal materials 50A/50B are present.
By doing this, even if the material is scattered due to intense plastic flow, the auxiliary metal material 50A/50B joins the plastic flow to compensate for the material, and as a result, the occurrence of voids is significantly reduced. be able to. Therefore, it is possible to obtain an extremely good bonding state with few defects such as coexistence of two types of metals and voids. Further, even if the first metal member 10 and the second metal member 20 are thin plates (for example, about 2 mm or less), the first metal member 10 and the second metal member 20 can be By holding it, a good bonding state can be obtained.

In the method for manufacturing a resistance element of the second embodiment, the auxiliary metal material 50A/50B is made of substantially the same aluminum as the second metal member 20.
By doing this, even if the material is scattered due to intense plastic flow, the auxiliary metal material 50A/50B joins the plastic flow to compensate for the material, and as a result, the occurrence of voids is significantly reduced. be able to. Therefore, it is possible to obtain an extremely good bonding state with few defects such as coexistence of two types of metals and voids.

FIG. 4 shows a cross-sectional micrograph of the resistance element 1 of the example.

Resistance element 1 of the above example was obtained under the following conditions.
▽First metal member 10:
Copper-manganese-nickel alloy for general electrical resistance (Mn: 10-13% by weight, Ni: 1-4% by weight, balance: Cu, Cu+Ni+Mn is 98% by weight or more) (plate thickness 3mm)
▽Second metal member 20:
Aluminum (plate thickness 3mm)
▽Friction stir welding:
Rotary tool diameter: 6mm
Rotation speed: 2000rpm
Traveling speed: 200mm/min
Auxiliary metal material: aluminum

The two photographs have different magnifications. In both photographs, the phase visible on the left side of the screen is a copper-manganese-nickel alloy, and the phase visible on the right side of the screen is aluminum.

As can be seen from the figure, by joining the first metal member 10 (resistance element body 11) and the second metal member 20 (electrode part 21) by the above-described friction stir welding, the resistance element 1 The element body 11 and the electrode section 21 are bonded to each other via an AL ₂ Cu compound layer. The thickness of the AL ₂ Cu compound layer was as thin as about 1 micron.

[Modified example]
Although particularly preferred embodiments of the present invention have been described above, the present invention is not intended to be limited to the illustrated embodiments, but can be modified and implemented in various ways, and the present invention includes various modified examples. The purpose is to

1: Resistance element 3: Boundary 10: First metal member 11: Resistance element body 20: Second metal member 21: Electrode section 30: Rotary tool 40: Anvil 41: Gap 42: Groove 50A: Auxiliary metal material 50B: Auxiliary metal material

Claims (8)

Prepare a first metal member made of a copper-manganese-nickel alloy for general electrical resistance and a second metal member made of aluminum,
the first metal member and the second metal member are arranged adjacent to each other so that there is substantially no gap;
With the rotary tool inserted into the second metal member, the rotary tool is moved along the boundary so that the outer peripheral edge of the rotary tool substantially coincides with the boundary between the first metal member and the second metal member. joining the first metal member and the second metal member by friction stir welding,
The first metal member serves as a resistor element body, the second metal member serves as an electrode portion, and the resistor element body and the electrode portion are bonded via an AL ₂ Cu compound layer. A method for manufacturing a resistive element. disposing an auxiliary metal material that covers at least a region along the boundary between the first metal member and the second metal member;
The method for manufacturing a resistance element according to claim 1, wherein the friction stir welding is performed by inserting the rotary tool into the second metal member in a region where the auxiliary metal material is present. The auxiliary metal material is arranged above the first metal member and the second metal member that are arranged adjacent to each other,
The method for manufacturing a resistance element according to claim 2, wherein the friction stir welding is performed by inserting the rotary tool into the second metal member from above the auxiliary metal member. The auxiliary metal material is arranged below the first metal member and the second metal member that are arranged adjacent to each other,
4. The method of manufacturing a resistance element according to claim 2, wherein the friction stir welding is performed by inserting the rotary tool into the second metal member from above the second metal member to the auxiliary metal member. The method for manufacturing a resistance element according to claim 2, wherein the auxiliary metal material is substantially the same aluminum as the second metal member. The copper-manganese-nickel alloy has Mn: 10 to 13% by weight, Ni: 1 to 4% by weight, and the balance is Cu, and Cu+Ni+Mn is 98% by weight or more. A method of manufacturing the resistance element described above.
A resistance element body made of a copper-manganese-nickel alloy for general electrical resistance,
an electrode portion made of aluminum bonded to the resistive element body;
The resistance element, wherein the resistance element main body and the electrode portion are joined via an AL ₂ Cu compound layer. The resistance element according to claim 7, wherein the copper-manganese-nickel alloy has Mn: 10 to 13% by weight, Ni: 1 to 4% by weight, and the balance is Cu, and Cu+Ni+Mn is 98% by weight or more.

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