JP5744649B2 - Conductor wire - Google Patents

Description

  The present invention relates to a conductor wire and a manufacturing method thereof, and a stranded conductor, an insulated wire, a welded structure, and a welding method using the conductor wire.

  In a wire harness routed in an automobile, the intermediate portion or the terminal portion of each of the pair of insulated wires may be peeled to expose the stranded conductors and welded by ultrasonic welding to form a splice portion. (For example, refer to Patent Document 1).

JP 2009-1167 A

  The weight reduction of automobiles for the purpose of reducing exhaust gas and improving fuel efficiency has been promoted, and therefore, there is a demand for weight reduction and miniaturization of each component mounted on the automobile. Among them, wire harnesses are no exception, and the diameter of electric wires has been reduced for weight reduction.

  By the way, in the past, a stranded wire conductor in which a conductor wire mainly made of soft copper was concentrically twisted was used in an electric wire for an automobile. However, disconnection at the time of in-vehicle or wiring due to insufficient strength due to the diameter reduction of the wire. Because of concern, at present, a conductor wire made of a hard material (including a strength improving material) such as a copper alloy is employed.

  However, in the assembly of wire harnesses, intermediate joints that form splices are used. However, a thin wire using a conductor wire made of a hard material is replaced with a general wire using a conductor wire made of soft copper. When jointing by sonic welding, there is a problem that welding strength is insufficient and variation is large.

  The subject of this invention is providing the conductor wire which can obtain the high and stable welding strength.

The conductor wire of the present invention is made of tough pitch copper or oxygen-free copper , and an oxide film having an average thickness of 20 nm or less is formed on the surface, the tensile strength is 350 MPa or more, and from the surface toward the center. From the surface of the Vickers hardness of the outer layer portion of 2.0 μm or less toward the center, the ratio of the inner layer portion of 5.0 μm or more to the Vickers hardness is 1.05 or less and the outer diameter is 0.08 to 0.26 mm. is there.

  The method for producing a conductor wire of the present invention performs a surface layer removing process for removing the surface layer of the conductor wire material.

  The stranded wire conductor of the present invention is constituted by collecting and twisting a plurality of conductor wires including the conductor wire of the present invention.

  The insulated wire of the present invention is constituted by covering the stranded conductor of the present invention with an insulating layer.

  The welded structure of the present invention is constructed by welding the stranded wire conductor exposed by partially peeling the insulating layer of the insulated wire of the present invention to another metal material.

  In the welding method of the present invention, the stranded wire conductor exposed by partially peeling the insulating layer of the insulated wire of the present invention is welded to another metal material.

  According to the present invention, although it is a thin conductor wire having an outer diameter of 0.08 to 0.26 mm, it is made of copper or a copper alloy, and an oxide film having an average thickness of 20 nm or less is formed on the surface. Moreover, the Vickers hardness of the inner layer portion of 5.0 μm or more from the surface to the center of the Vickers hardness of the outer layer portion having a tensile strength of 350 MPa or more and 2.0 μm or less from the surface toward the center. When the ratio to is 1.05 or less, it is possible to obtain a welding strength that is sufficiently high and has little variation.

It is a perspective view which shows the conductor wire which concerns on embodiment. It is explanatory drawing of the manufacturing method of the conductor wire which concerns on embodiment. It is sectional drawing of the insulated wire which concerns on embodiment. It is sectional drawing of the insulated wire of a modification. It is a top view which shows the welding structure which concerns on embodiment. It is explanatory drawing of the measuring method of welding strength.

  Hereinafter, embodiments will be described in detail based on the drawings.

  FIG. 1 shows a conductor wire 10 according to this embodiment.

  The conductor wire 10 according to the present embodiment is made of copper or a copper alloy, which is a hard material (including a strength improving material), and has a circular cross section. Examples of copper include tough pitch copper and oxygen-free copper. Examples of the copper alloy include a Cu-0.3% Sn alloy, a Cu-2.5% Ni-0.6% Si-0.35% Cr alloy (C18000), and the like. The outer diameter of the conductor wire 10 is 0.08 to 0.26 mm, preferably 0.08 to 0.22 mm, and more preferably 0.08 to 0.18 mm. The cross-sectional shape of the conductor wire 10 is preferably a perfect circle, but is not necessarily a perfect circle and may be a flat circle. In this case, the outer diameter is the maximum outer diameter of the cross section of the conductor wire 10.

The conductor wire 10 has an oxide film having an average thickness of 20 nm or less on the surface. The thickness of the oxide film is preferably 15 nm or less, and more preferably 10 nm or less. The thickness of the oxide film was measured by a cathodic reduction method using a 0.1N KCl aqueous solution as the electrolyte and platinum as the counter electrode, with an exposed area of 1.5 cm ² and a current density of 0.5 A / dm ^2. The The oxide film on the surface of the conductor wire 10 actually contains CuO and Cu ₂ O, and in the case of a copper alloy, it also contains oxides of other elements. Then, all shall be regarded as Cu ₂ O. Therefore, the thickness of the oxide film in the present application means the thickness of the oxide film in terms of Cu ₂ O.

  The conductor wire 10 has a tensile strength of 350 MPa or more, preferably 400 MPa or more, and more preferably 450 MPa or more. The tensile strength of the conductor wire 10 is measured based on JIS Z2241.

  The conductor wire 10 has a ratio of the outer layer portion Vickers hardness of 2.0 μm or less from the surface toward the center to the Vickers hardness of the inner layer portion 5.0 μm or more from the surface to the center of 1.05 or less. The ratio is preferably 1.04 or less, and more preferably 1.03 or less.

  The Vickers hardness of the outer layer portion and the inner layer portion is measured based on JIS K2244 as a test load of 5 mN for the outer layer portion and a test load of 50 mN for the inner layer portion.

  Next, the manufacturing method of the conductor wire 10 which concerns on this embodiment is demonstrated.

  As shown in FIG. 2A, the manufacturing method of the conductor wire 10 according to the present embodiment is a surface layer removing process for removing the surface layer of the conductor wire material, and then the conductor wire material from which the surface layer is removed is circular. And after the surface layer removal that is drawn in the cross section (cold drawing after the surface layer removal). In the surface layer removal processing, it is preferable to remove the surface layer of 3 to 8% of the outer diameter of the conductor wire material, and it is more preferable to remove the surface layer of 5 to 8%. By performing this surface layer removal processing, an oxide film having an average thickness of 20 nm or less is finally formed on the surface, and the tensile strength is 350 MPa or more and 2.0 μm from the surface toward the center. The ratio of the Vickers hardness of the inner layer portion of 5.0 μm or more from the surface of the Vickers hardness of the following outer layer portion toward the center is 1.05 or less, and the outer diameter is 0.08 to 0.26 mm. Thus, the above-described conductor wire 10 can be obtained. Examples of the surface layer removing process include a peeling process in which the conductor wire material is passed through a peeling die, a polishing process for polishing the surface of the conductor wire material, and an acid cleaning process in which the conductor layer material is immersed in an acid to etch the surface layer. It is done. Of these, skinning is preferable from the viewpoint that the surface layer of the conductor wire material can be removed uniformly and easily.

  The manufacturing method of the conductor wire 10 according to the present embodiment is performed in the initial form of the conductor wire material before the surface layer removal processing, as shown in FIG. 2B, from the viewpoint of uniformizing the surface layer removal allowance. It is desirable to further include a drawing process before removing the surface layer (cold drawing before removing the surface layer) for drawing a rough drawing wire in a circular cross section. The outer diameter of the rough drawn copper wire that is the initial form of the conductor wire material is, for example, 8 to 13 mm. In the wire drawing before surface layer removal, it is preferable to reduce the outer diameter of the conductor wire material to 3 to 7 mm, for example, from the viewpoint of preventing disconnection due to subsequent surface layer removal.

As shown in FIG. 2C, the method for manufacturing the conductor wire 10 according to the present embodiment further includes a heat treatment step during or after the wire drawing as necessary. Also good. The heat treatment method in the heat treatment step and the conditions of the heat treatment temperature and the heat treatment time may be set as appropriate. The heat treatment temperature is, for example, 100 to 600 ° C., and the heat treatment time is, for example, 0.5 to 10 hours. The heat treatment atmosphere is an atmosphere containing a reducing gas such as CO gas or H ₂ gas. That is, this heat treatment is a reduction treatment.

  In the wire drawing after removing the surface layer, the conductor wire material is passed through a wire drawing die to finish the conductor wire 10 having a final outer diameter.

  The above-described method for producing a conductor wire may be performed continuously, or may be performed independently. However, from the viewpoint of improving productivity, it is preferable that the method is performed continuously. In this case, the linear velocity is, for example, 100 to 2000 m / min.

  Next, the insulated wire 20 according to the present embodiment will be described.

  FIG. 3 shows an insulated wire 20 according to this embodiment. This insulated wire 20 is used, for example, to constitute a wire harness in an automobile.

  The insulated wire 20 according to the present embodiment is configured by covering a plurality of conductor wires 10 including the conductor wires 10 according to the present embodiment and twisting the conductor wires 21 with an insulating layer 22. Yes.

  The number of conductor wires 10 constituting the stranded conductor 21 is, for example, 7 to 37. The stranded wire conductor 21 only needs to include at least one conductor wire 10 according to this embodiment, but all the conductor wires 10 constituting the stranded wire conductor 21 are conductor wires 10 according to this embodiment. Is preferred.

  The twisted form of the stranded wire conductor 21 may be a collective twist or a concentric twist. The collective twist is simply a matter of collecting and twisting the conductor wires 10 and has an advantage that the manufacturing cost is low. In the concentric twisting, the conductor wires 10 are concentrically arranged and twisted so that the cross section has a shape approximate to a regular polygon or a circle. In the case where the outer diameters of the plurality of conductor wires 10 are the same, from the viewpoint that they can be stably twisted with low tension, rather than the collective twist, around the one conductor wire 10 that is the center line The concentric twist which twists the other conductor wire 10 is preferable. Also, in concentric twisting, from the viewpoint of reducing the diameter of the insulated wire 20, it is preferable to arrange the conductor wires 10 in a close-packed form without gaps. Specifically, for example, as shown in FIG. 7 (= 1 + 6) concentric strands in which six layers of six conductor wires 10 are arranged in a close-packed manner around one central conductor wire 10 and 6 around one central conductor wire 10. 19 (= 1 + 6 + 12) concentric strands in which 12 conductor wires 10 and 12 conductor wires 10 are arranged in a close-packed manner, and 6 conductors around one central conductor wire 10 37 (= 1 + 6 + 12 + 18) concentric strands in which the wire 10, the 12 conductor wires 10 around the wire 10, and the 18 conductor wires 10 around the wire 10 are arranged in a close-packed manner are preferable. If the number of the conductor wires 10 is increased, the cross-sectional area of one conductor wire 10 is reduced and it is easy to break, and the manufacturing process becomes complicated when two or more layers are twisted. Twisting is particularly preferred.

As shown in FIG. 2C, the stranded wire conductor 21 may be subjected to a final heat treatment after the stranded wire. The heat treatment temperature of the final heat treatment is, for example, 100 to 600 ° C., and the heat treatment time is, for example, 0.5 to 10 hours. The heat treatment atmosphere is an atmosphere containing a reducing gas such as CO gas or H ₂ gas. That is, this final heat treatment is a reduction treatment.

  As shown in FIG. 4, the stranded wire conductor 21 is formed by compressing a twisted wire obtained by collecting and twisting a plurality of conductor wires 10 or conductor wire materials, and the cross section of the conductor wire 10 (particularly the outermost layer) is deformed. The conductor occupancy in the cross section is increased by doing so. In addition, there is an effect that the thickness of the insulating layer 22 can be reduced.

  The stranded wire conductor 21 can also be obtained by etching a surface layer of each conductor wire material by immersing a plurality of conductor wire materials that have not been subjected to surface layer removal processing and immersing the twisted stranded wire in an acid. Can be manufactured. In this case, a surface layer removing process for removing the surface layer of the conductor wire material is performed after the stranded wire.

  Examples of the material for forming the insulating layer 22 include a polyvinyl chloride resin composition, a polyolefin resin composition such as polyethylene, polypropylene, and α-olefin. The thickness of the insulating layer 22 is, for example, 0.2 to 0.3 mm.

  The insulated wire 20 according to the present embodiment can be manufactured by forming the insulating layer 22 so as to cover the stranded conductor 21 by extrusion molding.

  By the way, the weight reduction of automobiles for the purpose of reducing exhaust gas and improving fuel efficiency has been promoted. For this reason, it is required to reduce the weight and size of each component mounted on the automobile. Among them, wire harnesses are no exception, and the diameter of electric wires has been reduced for weight reduction. Conventionally, in an electric wire for an automobile, a stranded wire conductor in which a conductor wire mainly made of soft copper is concentrically twisted has been used, but there is a concern about disconnection at the time of wiring due to insufficient strength due to the reduction in the diameter of the electric wire. Therefore, at present, a conductor wire made of a hard material (including a strength improving material) such as a copper alloy is employed.

  However, in the assembly of wire harnesses, intermediate joints that form splices are used. However, a thin wire using a conductor wire made of a hard material is replaced with a general wire using a conductor wire made of soft copper. When jointing by sonic welding, there is a problem that welding strength is insufficient and variation is large.

  However, in this embodiment, although the thin conductor wire 10 having an outer diameter of 0.08 to 0.26 mm is used, it is made of copper or a copper alloy and has an average thickness of 20 nm or less on the surface. An inner layer portion having an oxide film formed thereon and having a tensile strength of 350 MPa or more and an outer layer portion of 2.0 μm or less from the surface toward the center and a Vickers hardness of 5.0 μm or more from the surface to the center. When the ratio of to Vickers hardness is 1.05 or less, it is possible to obtain a sufficiently high welding strength with little variation.

  Next, the welding structure 30 according to the present embodiment will be described.

  FIG. 5 shows a welded structure 30 according to this embodiment. In this welded structure 30, the intermediate portion of the insulated wire 20 and the insulating layer 22 of the terminal portion are partially peeled to expose the stranded wire conductor 21 exposed in the middle portion of another insulated wire 20 ′ processed in the same manner. The stranded wire conductor 21 ′ is welded at the welded portion 31 where they are overlapped to form a splice portion. For example, it forms a wire harness mounted in an automobile.

  As another insulated wire 20 ′, for example, a stranded wire conductor 21 ′ obtained by collecting and twisting 7 to 65 conductor wires 10 ′ made of copper or a copper alloy having an outer diameter of 0.08 to 0.32 mm is used as an insulating layer. A combination of a plurality of coatings with 22 ′ may be mentioned. From the viewpoint that the welded strength is sufficiently high and the variation is small, the other insulated wire 20 ′ is a conductor wire 10 ′ made of annealed copper having a tensile strength of less than 350 MPa. It is preferable that it is comprised. The other insulated wire 20 'may have the same configuration as the insulated wire 20 according to the present embodiment. Further, the object to be welded is not limited to an electric wire, and may be another metal material such as an electrode.

  Examples of the welding means include ultrasonic welding, resistance welding, and laser welding. Of these, ultrasonic welding is preferable for the connection between wires having a reduced diameter. The conditions for ultrasonic welding are, for example, a pressure of 2 to 6 bar, a width of 1 to 7 mm, an amplitude of 50 to 100%, and an energy of 100 to 2000 Ws.

(Conductor wire)
<Example 1>
A rough-drawn copper wire made of tough pitch copper is passed through a drawing die to draw a circular cross section (drawing before surface layer removal, φ8.0 mm → φ2.6 mm), and then passed through a peeling die to perform peeling. (Surface layer removal processing) Subsequently, after drawing through a wire drawing die (drawing after surface layer removal, φ2.6 mm → φ1.0 mm), and further through a wire drawing die to the final outer diameter A conductor wire was obtained by drawing (φ1.0 mm → φ0.16 mm). Then, after collecting the seven conductor wires and concentrically twisting them to form a twisted wire conductor, an insulating layer was formed so as to cover the twisted wire conductor by extrusion molding to produce an insulated wire. This insulated wire was referred to as Example 1. In addition, the final heat treatment after the stranded wire was not performed.

<Example 2>
An insulated wire was produced in the same manner as in Example 1 except that a final heat treatment was performed on the stranded wire conductor after the stranded wire at a heat treatment temperature of 100 ° C. and a heat treatment time of 1 hour. .

<Example 3>
An insulated wire was produced in the same manner as in Example 1 except that a final heat treatment was performed on the stranded wire conductor after the stranded wire at a heat treatment temperature of 120 ° C. and a heat treatment time of 1 hour. .

<Comparative Example 1>
An insulated wire was produced in the same manner as in Example 1 except that the surface layer removal processing was not performed, and this was used as Comparative Example 1.

<Comparative Example 2>
An insulated wire was produced in the same manner as in Example 3 except that the surface layer removal processing was not performed, and this was used as Comparative Example 2.

<Reference Example 1>
An insulated wire was prepared in the same manner as in Comparative Example 1 except that a final heat treatment was performed on the stranded wire conductor after the stranded wire at a heat treatment temperature of 140 ° C. and a heat treatment time of 1 hour. .

<Reference Example 2>
An insulated wire was produced in the same manner as in Comparative Example 1 except that the stranded wire conductor was subjected to a final heat treatment at a heat treatment temperature of 200 ° C. and a heat treatment time of 1 hour. .

<Example 4>
An insulated wire was produced in the same manner as in Example 1 except that a rough drawn copper wire made of a Cu-0.3% Sn alloy was used.

<Example 5>
As the surface layer removing process, an insulated wire was produced in the same manner as in Example 1 except that a polishing process for applying a sandpaper to the surface of the conductor wire material was performed instead of the skinning process. did.

<Example 6>
As the surface layer removal process, an insulated wire was produced in the same manner as in Example 1 except that the conductor wire material was subjected to an acid cleaning process in which the conductor wire material was immersed in an acid aqueous solution (hydrochloric acid having a concentration of 10%). This was taken as Example 6.

<Example 7>
Insulated in the same manner as in Example 1 except that the surface layer removal process by peeling is not performed, and the stranded conductor after concentric twisting is subjected to an acid cleaning process soaked in an acid aqueous solution (10% hydrochloric acid). An electric wire was produced and designated as Example 7.

<Comparative Example 3>
An insulated wire was produced in the same manner as in Example 4 except that the surface layer removal processing was not performed.

<Example 8>
Using rough-drawn copper wire made of a Cu-2.5% Ni-0.6% Si-0.35% Cr alloy, the heat treatment temperature was 500 ° C. and the heat treatment time was 1 hour for the stranded wire conductor after the stranded wire. An insulated wire was produced in the same manner as in Example 1 except that the final heat treatment was performed.

<Example 9>
An insulated wire was produced in the same manner as in Example 8 except that the heat treatment temperature in the final heat treatment was 550 ° C.

<Example 10>
An insulated wire was produced in the same manner as in Example 8 except that the heat treatment temperature in the final heat treatment was 600 ° C., and it was designated as Example 10.

<Comparative Example 4>
An insulated wire was produced in the same manner as in Example 9 except that the surface layer removal processing was not performed, and this was designated as Comparative Example 4.

<Reference Example 3>
An insulated wire was produced in the same manner as in Comparative Example 4 except that the heat treatment temperature in the final heat treatment was 650 ° C.

(Test evaluation method)
<Tensile strength>
About each of Examples 1-10, Comparative Examples 1-4, and Reference Examples 1-3, the conductor wire was pulled out and it was set as the test piece, and the tensile strength was measured based on JISZ2241.

<Thickness of oxide film>
For each of Examples 1 to 10, Comparative Examples 1 to 4, and Reference Examples 1 to 3, a conductor wire was drawn out as a test piece, and the thickness of the oxide film on the surface was set to 0.1 N KCl aqueous solution and electrolyte. Platinum was used for each counter electrode, and measurement was performed by a cathode reduction method with an exposed area of 1.5 cm ² and a current density of 0.5 A / dm ² .

<Vickers hardness ratio>
For each of Examples 1 to 10, Comparative Examples 1 to 4, and Reference Examples 1 to 3, a conductor wire was drawn out as a test piece, and from the outer layer portion and the surface of 2.0 μm or less from the surface toward the center in the cross section. Each Vickers hardness of the inner layer portion of 5.0 μm or more toward the center was measured based on JIS K2244. In the measurement of the outer layer portion, the test load was 5 mN, and in the measurement of the inner layer portion, the test load was 50 mN.

<Welding strength>
About each of Examples 1-10, Comparative Examples 1-4, and Reference Examples 1-3, the insulating layer of the intermediate part was partially peeled, and the twisted conductor was exposed. Moreover, three conductor-side insulated wires in which seven conductor wires made of copper having an outer diameter of 0.32 mm were gathered and concentrically twisted and covered with an insulating layer were prepared. Was partially peeled to expose the stranded conductor. Then, as shown in FIG. 6, the exposed stranded wire conductor of the insulated wire 61 to be tested is ultrasonically welded to the exposed stranded wire conductors of the three attached-side insulated wires 62 to form a welded portion 63. A 180 ° peel test was performed on the insulated wire 61 to be tested, and the peel strength at the weld 63 was measured as the weld strength. The measurement was performed 30 times, and the case where the average value was 20N or more was determined as A, and the case where it was less than 20N was determined as B.

(Test evaluation results)
Table 1 shows the test results.

  Tensile strength is 550 MPa in Example 1, 450 MPa in Example 2, 350 MPa in Example 3, 600 MPa in Comparative Example 1, 350 MPa in Comparative Example 2, 300 MPa in Reference Example 1, and 250 MPa in Reference Example 2. Further, Example 4 is 800 MPa, Example 5 is 800 MPa, Example 6 is 800 MPa, Example 7 is 800 MPa, Comparative Example 3 is 800 MPa, Example 8 is 700 MPa, Example 9 is 550 MPa, Example 10 was 400 MPa, Comparative Example 4 was 550 MPa, and Reference Example 3 was 300 MPa.

  The average thickness of the oxide film was 13 nm in Example 1, 13 nm in Example 2, 14 nm in Example 3, 22 nm in Comparative Example 1, 22 nm in Comparative Example 2, 18 nm in Reference Example 1, and 28 nm in Reference Example 2. In addition, Example 4 is 15 nm, Example 5 is 18 nm, Example 6 is 20 nm, Example 7 is 20 nm, Comparative Example 3 is 25 nm, Example 8 is 10 nm, and Example 9 is 10 nm. Example 10 was 10 nm, Comparative Example 4 was 22 nm, and Reference Example 3 was 22 nm.

  The Vickers hardness ratio is 1.01 for Example 1, 1.01 for Example 2, 1.04 for Example 3, 1.04 for Comparative Example 1, 1.07 for Comparative Example 2, and Reference Example 1 1.06 and Reference Example 2 are 1.04, and Example 4 is 1.02, Example 5 is 1.03, Example 6 is 1.04, and Example 7 is 1.04. Example 3 is 1.04, Example 8 is 1.02, Example 9 is 1.02, Example 10 is 1.03, Comparative Example 4 is 1.03, and Reference Example 3 is 1. 07.

  The peel strengths of Examples 1 to 10 were A, Comparative Examples 1 to 4 were B, and Reference Examples 1 to 3 were A. In Reference Examples 1 to 3 having low tensile strength, even if the average thickness of the oxide film is thicker than 20 nm or the Vickers hardness ratio is larger than 1.05, the welding strength is high and the variation is small. I understand that.

  INDUSTRIAL APPLICATION This invention is useful about a conductor wire, its manufacturing method, a stranded wire conductor using the same, an insulated wire, a welding structure, and a welding method.

DESCRIPTION OF SYMBOLS 10 Conductor wire 20 Insulated electric wire 21 Stranded wire conductor 22 Insulating layer 30 Welded structure

Claims (15)

An oxide film made of tough pitch copper or oxygen-free copper and having an average thickness of 20 nm or less is formed on the surface,
The ratio of the Vickers hardness of the outer layer portion having a tensile strength of 350 MPa or more and 2.0 μm or less from the surface toward the center to the Vickers hardness of the inner layer portion of 5.0 μm or more from the surface to the center is 1.05. A conductor wire having an outer diameter of 0.08 to 0.26 mm as follows. The conductor wire according to claim 1 ,
Conductor wire used for automotive applications. A method of manufacturing a conductor wire according to claim 1 or 2 ,
A method for manufacturing a conductor wire, which performs a surface layer removing process for removing a surface layer of a conductor wire material. In the manufacturing method of the conductor wire described in Claim 3 ,
A cold working step of performing cold working on the conductor wire material, and a heat treatment step of performing a heat treatment on the conductor wire material cold worked in the cold working step,
The surface layer removal processing is included in the cold processing in the cold processing step, and the cold processing in the cold processing step is performed after the surface layer removal for drawing the conductor wire material after the surface layer removal processing. A method of manufacturing a conductor wire including wire drawing. In the manufacturing method of the conductor wire described in Claim 4 ,
The cold working in the cold working step is a method of manufacturing a conductor wire that further includes a surface layer pre-removal drawing process for drawing the conductor wire material into a circular cross section before the surface layer removal process. In the manufacturing method of the conductor wire in any one of Claims 3 thru | or 5 ,
The said surface layer removal process is a manufacturing method of the conductor wire which is the peeling process which peels and removes the surface layer of conductor wire material. A stranded wire conductor configured by collecting and twisting a plurality of conductor wires including the conductor wire according to claim 1 . In the stranded conductor according to claim 7 ,
A twisted conductor formed by compression molding after collecting and twisting the plurality of conductor wires. In the stranded wire conductor according to claim 7 or 8 ,
A twisted wire conductor in which all of the plurality of conductor wires are conductor wires according to any one of claims 1 to 4. In the stranded conductor according to any one of claims 7 to 9 ,
A stranded wire conductor constructed in concentric strands. In the stranded conductor according to claim 10 ,
A stranded wire conductor in which the number of the plurality of conductor wires is seven. The insulated wire comprised by coat | covering the twisted-wire conductor in any one of Claims 7 thru | or 11 with an insulating layer. The welding structure comprised by welding the twisted-wire conductor exposed by peeling off the insulation layer of the insulated wire described in Claim 12 partially to another metal material. The welding method which welds the twisted-wire conductor exposed by peeling off the insulation layer of the insulated wire described in Claim 12 to another metal material. The welding method according to claim 14 , wherein
A welding method in which the welding means is ultrasonic welding.

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