JP2017152343A - Manufacturing method of electric wire with terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of an electric wire with a terminal which inhibits displacement of electric contacts caused by expansion and contraction and inhibits strength deterioration and peeling destruction of contact portions between electric wires and terminals.SOLUTION: A tip exposure part 112A and a base end exposure part 112B are formed at a first electric wire 10, and the tip exposure part 112A is ultrasonic-welded to a first terminal 40. Similarly, a tip exposure part 122A and a base end exposure part 122B are formed at a second electric wire 20, and the tip exposure part 122A is ultrasonic-welded to a second terminal 50. After the first terminal 40 and the second terminal 50 are respectively welded to the first electric wire 10 and the second electric wire 20, the base end exposure part 112B of the first electric wire 10 and the base end exposure part 122B of the second electric wire 20 are crimped by a crimp member 30 formed by the same material as element wires 13, 23 to connect the first electric wire 10 to the second electric wire 20.SELECTED DRAWING: Figure 11B

Description

  The present invention relates to a method for manufacturing a terminal-attached electric wire, and more particularly to a method for manufacturing a terminal-attached electric wire in which terminals are connected to both ends of the electric wire.

  Conventionally, as a method of manufacturing a terminal-attached electric wire in which an electric wire made of a conductive material such as aluminum is connected to a terminal made of a conductive material such as copper, an ultrasonic vibration is applied to the exposed core wire so that the strands are connected to each other. It is known that this core wire is crimped to a terminal after ultrasonic welding and integration (see, for example, Patent Document 1).

  In such a terminal-attached electric wire, the oxide film of the wire is destroyed by ultrasonic vibration, so even in the case of a thick wire, an increase in electrical resistance between the wires can be suppressed. Sufficient conduction between the two can be achieved. However, since the terminal and the core wire are crimped, there are the following problems.

  That is, when a large current flows through the crimped portion between the electric wire (core wire) and the terminal or the energization is terminated, the temperature of the crimped portion increases or decreases accordingly, and thereby the crimped portion expands and contracts. repeat. At this time, when each of the strands and terminals constituting the core wire is formed of a material having a different thermal expansion coefficient, the strands and the terminal exhibit different volume changes with the temperature change of the crimping portion. The part of contact (electrical contact) with is gradually shifted. Then, an oxide film is formed again on the element wire at the shifted position, resulting in an increase in electrical resistance.

  In order to solve such a problem, it is conceivable to ultrasonically weld the core wire and the terminal by applying ultrasonic vibration after placing the core wire exposed from the electric wire on the terminal. According to this method, since the core wire and the terminal can be welded in a wide range by ultrasonic vibration, the electrical contact between the core wire and the terminal becomes a surface. Therefore, the influence of the deviation of the electrical contact due to expansion and contraction due to temperature change is small.

  However, when the terminals are ultrasonically welded to both ends of the wire by such a method, it is necessary to apply ultrasonic vibration to the other end of the wire after applying ultrasonic vibration to one end of the wire. There is. In this case, as shown in FIG. 13, since the ultrasonic vibration applied to one end of the wire is transmitted to the other end that has been ultrasonically welded, the ultrasonically welded wire vibrates and follows this. Thus, the ultrasonic welded terminal will also vibrate. As a result, a load is applied to the contact interface between the electric wire and the terminal, and a decrease in contact strength, peeling failure, or the like occurs at the end of ultrasonic welding.

JP 2011-82127 A

  The present invention has been made in view of such problems of the prior art, and can suppress the displacement of the electrical contact due to expansion and contraction, and can reduce the strength of the contact portion between the electric wire and the terminal, peeling damage, etc. It aims at providing the manufacturing method of the electric wire with a terminal which can be suppressed.

  According to the first aspect of the present invention, the manufacture of the electric wire with a terminal that can suppress the displacement of the electrical contact due to the expansion and contraction, and can suppress the decrease in the strength of the contact portion between the electric wire and the terminal or the peeling failure. A method is provided. In this method, the insulating coating covering the tip of the first electric wire is peeled to expose the core wire composed of a plurality of strands, thereby forming the first tip exposed portion at the tip, A first base end exposed portion is formed at the base end portion by peeling off the insulating film covering the base end portion of one electric wire to expose a core wire composed of a plurality of strands. Then, the first terminal is welded to the first tip exposed portion of the first electric wire by applying ultrasonic vibration after placing the first tip exposed portion on the first terminal. Similarly, the insulating coating covering the tip of the second electric wire is peeled off to expose a core wire composed of a plurality of strands, thereby forming a second tip exposed portion at the tip, and the second A second base end exposed portion is formed at the base end portion by peeling off the insulating coating covering the base end portion of the electric wire to expose a core wire composed of a plurality of strands. Then, after placing the second tip exposed portion on the second terminal, ultrasonic vibration is applied to weld the second terminal to the second tip exposed portion of the second electric wire. Then, after the welding of the first terminal to the first electric wire and the welding of the second terminal to the second electric wire, the first proximal end exposed portion of the first electric wire and the second electric wire The first electric wire and the second electric wire are crimped to the second base end exposed portion of the electric wire by a crimping member made of the same material as the strands of the first and second electric wires. And connect.

  According to this method, since the oxide film covering the plurality of strands is broken by ultrasonic welding and the plurality of strands are integrated, an increase in electrical resistance between the strands can be suppressed. Further, since the core wire and the terminal are welded in a wide range by ultrasonic welding, it is possible to suppress the deviation of the electrical contact due to the expansion and contraction of the electric wire and the terminal. Furthermore, since the ultrasonic vibration is not transmitted to the ultrasonic welded tip by crimping and connecting the two electric wires, the connection strength is reduced or the peeling failure occurs at the ultrasonic welded tip. It is prevented. In addition, since the crimping member is made of the same material as the element wire, good conduction between the first electric wire and the second electric wire is achieved.

  Here, before welding the first terminal to the first electric wire, the first proximal end exposure is performed by applying ultrasonic vibration to the first proximal end exposed portion of the first electric wire. It is preferable to weld a plurality of strands constituting the core wire exposed at the portion. In addition, by applying ultrasonic vibration to the second proximal end exposed portion of the second electric wire before welding the second terminal to the second electric wire, the second proximal end exposed portion It is preferable to weld a plurality of strands constituting the core wire exposed in step (b). Thereby, since the strand in a base end exposed part is integrated by ultrasonic welding, conduction | electrical_connection between a 1st electric wire and a 2nd electric wire becomes still better.

  An insertion space into which the electric wire can be inserted may be formed inside the crimp member. And after welding of the first terminal to the first electric wire and welding of the second terminal to the second electric wire, the first proximal end exposed portion of the first electric wire, and The second proximal end exposed portion of the second electric wire is inserted into the insertion space, the crimp member is crimped, and the first proximal end exposed portion and the second inserted into the insertion space are inserted. The proximal end exposed portion may be crimped. By using the crimping member having such an insertion space, the first electric wire and the second electric wire can be efficiently connected.

  Further, serrations (uneven portions) may be formed on the inner peripheral surface of the crimping member that defines the insertion space. Thereby, the oxide film which covers the strand of the said 1st and 2nd base end exposed part can be destroyed efficiently.

  According to the present invention, since the core wire and the terminal are welded in a wide range by ultrasonic welding, it is possible to suppress the deviation of the electrical contact due to the expansion and contraction of the electric wire and the terminal. In addition, since the ultrasonic vibration is not transmitted to the ultrasonic welded tip by crimping and conducting the two electric wires, the connection strength is reduced or the peeling failure occurs at the ultrasonic welded tip. It is prevented. Furthermore, since the crimping member is formed of the same material as that of the element wire, good conduction between the first electric wire and the second electric wire can be achieved.

It is a top view which shows typically the electric wire with a terminal manufactured by the manufacturing method concerning this invention. It is a front view of the electric wire with a terminal shown in FIG. It is a schematic diagram which expands and shows the 1st terminal vicinity of the electric wire with a terminal shown in FIG. It is a schematic diagram which expands and shows the 2nd terminal vicinity of the electric wire with a terminal shown in FIG. It is a perspective view of the connection part used for the electric wire with a terminal shown in FIG. It is a front view of the connection part shown in FIG. It is a rear view of the connection part shown in FIG. It is an AA line sectional view of the electric wire with a terminal shown in FIG. It is a figure which shows the manufacturing process of the electric wire with a terminal shown in FIG. It is a figure which shows the manufacturing process of the electric wire with a terminal shown in FIG. It is a figure which shows the manufacturing process of the electric wire with a terminal shown in FIG. It is a figure which shows the manufacturing process of the electric wire with a terminal shown in FIG. It is a figure which shows the manufacturing process of the electric wire with a terminal shown in FIG. It is a figure which shows the manufacturing process of the electric wire with a terminal shown in FIG. It is a figure which shows the manufacturing process of the electric wire with a terminal shown in FIG. It is a figure which shows the manufacturing process of the electric wire with a terminal shown in FIG. It is a figure which shows the manufacturing process of the electric wire with a terminal shown in FIG. It is a figure which shows the manufacturing process of the electric wire with a terminal shown in FIG. It is a figure which shows the process of connecting a 1st electric wire to a 1st terminal by ultrasonic welding. It is a figure which shows the process of connecting a 1st electric wire to a 1st terminal by ultrasonic welding. It is a figure which shows the process of connecting a 1st electric wire to a 1st terminal by ultrasonic welding. It is a figure which shows the process of connecting a 1st electric wire to a 1st terminal by ultrasonic welding. It is a figure which shows the other manufacturing method of an electric wire with a terminal.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 13. 1 to 13, the same or corresponding components are denoted by the same reference numerals, and redundant description is omitted. In addition, in FIGS. 1 to 13, the scale and dimensions of each component are exaggerated, and some components may be omitted.

  FIG. 1 is a plan view schematically showing a terminal-attached electric wire 1 manufactured by using the manufacturing method according to the present invention, and FIG. 2 is a front view of the terminal-attached electric wire 1. As shown in FIGS. 1 and 2, the terminal-attached electric wire 1 includes a first electric wire 10 located on the left side, a second electric wire 20 located on the right side, the first electric wire 10 and the second electric wire 20. Connected to one end (tip) of the first electric wire 10, the first terminal 40 connected to one end (tip) of the first electric wire 10, and one end (tip) of the second electric wire 20. The second terminal 50 is provided.

  As shown in FIG. 2, the insulating coating 11 is peeled off at the distal end portion of the first electric wire 10, and the core wire 12 located inside the first electric wire 10 is exposed. FIG. 3 is an enlarged plan view showing the vicinity of the first terminal 40. As shown in FIG. 3, the core wire 12 of the first electric wire 10 includes a plurality of strands 13. Such a wire 13 is formed of a conductive material such as aluminum.

  As shown in FIG. 3, the 1st terminal 40 consists of a substantially flat conductive material (for example, copper), the electric wire connection part 41 to which the core wire 12 of the 1st electric wire 10 is connected, and an electric wire. And an extending portion 42 extending from the connecting portion 41 in the axial direction of the first electric wire 10. The extension portion 42 has a lance locking hole 43 for locking a lance provided in a corresponding terminal accommodating portion (not shown) and a terminal connection portion of a counterpart device to which the first terminal 40 is connected. A bolt hole 44 for fastening a bolt (not shown) for fixing the connection to (not shown) is formed.

  As shown in FIG. 3, the core wire 12 exposed at the distal end portion of the first electric wire 10 is placed on the electric wire connection portion 41 of the first terminal 40, and by applying ultrasonic vibration to the region S1, The core wire 12 is welded to the wire connecting portion 41 (ultrasonic welding). Thereby, the first electric wire 10 is connected to the first terminal 40.

  Similarly, as shown in FIG. 2, the insulating coating 21 is peeled off at one end (tip) of the second electric wire 20, and the core wire 22 located inside the second electric wire 20 is exposed. It is in a state. FIG. 4 is an enlarged plan view showing the vicinity of the second terminal 50. As shown in FIG. 4, the core wire 22 of the second electric wire 20 includes a plurality of strands 23. For example, such a strand 23 is formed of the same conductive material as the strand 13 such as aluminum.

  As shown in FIG. 4, the second terminal 50 is made of a substantially flat conductive material (for example, copper), and includes an electric wire connecting portion 51 to which the core wire 22 of the second electric wire 20 is connected, and an electric wire. And an extending portion 52 extending in the axial direction of the second electric wire 20 from the connecting portion 51. The extension portion 52 has a lance locking hole 53 for locking a lance provided in a corresponding terminal accommodating portion (not shown) and a terminal connection portion of a counterpart device to which the second terminal 50 is connected. A bolt hole 54 for fastening a bolt (not shown) for fixing the connection to (not shown) is formed.

  As shown in FIG. 4, the core wire 22 exposed at the tip of the second electric wire 20 is placed on the electric wire connection portion 51 of the second terminal 50, and by applying ultrasonic vibration to the region S <b> 2, The core wire 22 is welded to the wire connection part 51 (ultrasonic welding). Thereby, the second electric wire 20 is connected to the second terminal 50.

  Referring to FIGS. 1 and 2 again, the first end of the first electric wire 10 located on the side opposite to the front end of the first electric wire 10 and the second end of the second electric wire 20 located on the opposite side of the first electric wire 10. The proximal end portion of the second electric wire 20 is connected via the connecting portion 30, whereby the first electric wire 10 and the second electric wire 20 are electrically connected to each other. That is, the terminal-attached electric wire 1 in which the first electric wire 10 and the second electric wire 20 are integrated through the connection portion 30 is formed. The connecting portion 30 (crimping member) is crimped in a state in which the proximal end portion of the first electric wire 10 and the proximal end portion of the second electric wire 20 are accommodated therein, thereby the core wire 12 of the first electric wire 10. And it crimps | bonds to each of the core wire 22 of the 2nd electric wire 20, and connects the core wire 12 and the core wire 22 (electrically connects).

  Such a connection part 30 is formed of the same material as the strands 13 and 23. Thereby, since the thermal expansion coefficient of the connection part 30 and the strands 13 and 23 becomes the same, even when the temperature of the connection part 30 rises or falls, it is suppressed that the electrical contact of the core wire 12 and the core wire 22 shifts | deviates. As a result, good conduction between the first electric wire 10 and the second electric wire 20 is achieved.

  FIG. 5 is a perspective view showing such a connecting portion 30, FIG. 6 is a front view of the connecting portion 30, and FIG. 7 is a rear view. As shown in FIGS. 5 to 7, the connecting portion 30 has a substantially rectangular parallelepiped outer shape. The connection portion 30 corresponds to the first electric wire 10 and the second electric wire 20, and the first through hole 32 into which the first electric wire 10 can be inserted and the second through which the second electric wire 20 can be inserted. Through-holes 33 are formed. The through holes 32 and 33 penetrate from the front surface 31 to the back surface 35 of the connection part 30. In the present specification, for convenience, the upper through hole is referred to as a first through hole 32 and the lower through hole is referred to as a second through hole 33. In addition, as long as the 1st electric wire 10 and the 2nd electric wire 20 can be crimped | bonded and can be made conductive, the shape of a connection part (crimping member) is not restricted to this. Further, it is not always necessary to form the connection portion 30 with the same material as the strands 13 and 23.

  As shown in FIGS. 5 to 7, the first inner peripheral surface 32 </ b> A that defines the first through-hole 32 is provided with a plurality of protrusions 32 </ b> B, whereby the first inner periphery of the connection portion 30. Serrations (uneven portions) are formed on the surface 32A. Similarly, a plurality of protrusions 33B are also provided on the second inner peripheral surface 33A that defines the second through-hole 33, whereby serrations are formed on the second inner peripheral surface 33A of the connecting portion 30. The

  By the way, the core wire 12 is exposed at the base end portion of the first electric wire 10 in the same manner as the tip portion thereof, and similarly, the core wire 22 is provided at the base end portion of the second electric wire 20 in the same manner as the tip end portion thereof. Exposed. FIG. 8 is a cross-sectional view taken along line AA shown in FIG. As shown in FIG. 8, the core wire 12 exposed at the proximal end portion of the first electric wire 10 is inserted into the first through hole 32 of the connection portion 30, and the second through hole 33 has the first through hole 32. The core wire 22 exposed at the proximal end portion of the second electric wire 20 is inserted. And the connection part 30 deform | transforms by pressing and crimping the connection part 30 from the upper direction and the downward direction, and it crimps | bonds to each of the core wire 12 of the 1st electric wire 10, and the core wire 22 of the 2nd electric wire 20. FIG. Thereby, the core wire 12 and the core wire 22 are electrically connected.

Next, a method for manufacturing such a terminal-attached electric wire 1 will be described in detail with reference to FIGS. 9A to 12D.

  First, the 1st electric wire 10 formed by coat | covering the core wire 12 comprised with the some strand 13 with the insulating film 11 is prepared (FIG. 9A). Next, the insulating film 11 at the tip end portion of the first electric wire 10 is peeled off to expose the core wire 12, and a tip exposed portion 112A is formed at the tip end portion of the first electric wire 10 (FIG. 9B). Similarly, the insulating coating 11 at the base end portion of the first electric wire 10 is peeled to expose the core wire 12, and the base end exposed portion 112B is formed at the base end portion of the first electric wire 10 (FIG. 9B). Next, as shown in FIG. 9C, ultrasonic vibration is applied to the base end exposed portion 112B to integrate the plurality of strands 13 (ultrasonic welding). Thereafter, the tip exposed portion 112A is placed on the wire connecting portion 41 of the first terminal 40, and ultrasonic vibration is applied from above the tip exposed portion 112A, so that the core wire 12 of the tip exposed portion 112A is connected to the first terminal 40. Are welded (ultrasonic welding) (FIG. 9D). The ultrasonic welding process will be described in detail later.

  Similar to the first electric wire 10, the second electric wire 20 is ultrasonically welded to the second terminal 50. That is, first, a second electric wire 20 is prepared by covering a core wire 22 composed of a plurality of strands 23 with an insulating coating 21 (FIG. 10A). Next, the insulating film 21 at the tip end portion of the second electric wire 20 is peeled off to expose the core wire 22, and a tip exposed portion 122A is formed at the tip end portion of the second electric wire 20 (FIG. 10B). Similarly, the insulating coating 21 at the base end portion of the second electric wire 20 is peeled to expose the core wire 22, and a base end exposed portion 122B is formed at the base end portion of the second electric wire 20 (FIG. 10B). Next, the several strand 23 of the base end exposed part 122B is integrated by ultrasonic welding (FIG. 10C). Thereafter, the tip exposed portion 122A is placed on the wire connecting portion 51 of the second terminal 50, and the core wire 22 of the tip exposed portion 122A is ultrasonically welded to the second terminal 50 (FIG. 10D).

  Next, the base end exposed portion 112B of the first electric wire 10 to which the first terminal 40 is connected and the base end exposed portion 122B of the second electric wire 20 to which the second terminal 50 is connected are connected to the connecting portion 30. (FIG. 11A). And by crimping this connection part 30, the connection part 30 is crimped | bonded to the base end exposed part 112B of the 1st electric wire 10, and the base end exposed part 122B of the 2nd electric wire 20 (FIG. 11B). Thereby, the core wire 12 of the 1st electric wire 10 and the core wire 22 of the 2nd electric wire 20 are electrically connected, and the electric wire 1 with a terminal is completed (refer FIG.1 and FIG.2).

  Here, the ultrasonic welding process described above will be described in detail with reference to FIGS. 12A to 12D, taking as an example the case where the tip exposed portion 112 </ b> A is welded to the first terminal 40. 12A to 12D are front views showing the vicinity of the first terminal 40 shown in FIG.

  First, as shown to FIG. 12A, the 1st terminal 40 is mounted on the anvil 500 of an ultrasonic welding apparatus. Then, as shown in FIG. 12B, the core wire 12 of the tip exposed portion 112 </ b> A of the first electric wire 10 is arranged on the electric wire connecting portion 41 of the first terminal 40.

  Next, as shown in FIG. 12C, the horn 600 of the ultrasonic welding apparatus is pressed from above the core wire 12 on the electric wire connecting portion 41 and ultrasonically vibrated while being pressurized. Then, the oxide film and dirt which exist on the some strand 13 which comprises the core wire 12, and the 1st terminal 40 are removed by ultrasonic vibration, and the movement of the metal atom which arises by ultrasonic vibration is strong attraction between metal atoms. And metal atoms are bonded to each other to form a solid phase welding state. Thereby, a plurality of strands are integrated in the region S1 of the core wire 12 (see FIG. 3), and the core wire 12 of the tip exposed portion 112A is welded to the wire connecting portion 41 of the first terminal 40 in a wide range ( FIG. 12D).

  According to the terminal-equipped electric wire 1 manufactured by such a method, the oxide film covering the plurality of strands is broken by ultrasonic welding, and the plurality of strands are integrated, so that the electrical resistance between the strands increases. Is suppressed.

  In addition, when the wire and the terminal are made of materials having different thermal expansion coefficients, the wire and the terminal exhibit different volume changes due to temperature changes, and there is a possibility that the electrical contact between the electric wire (core wire) and the terminal is shifted. However, according to the electric wire with terminal 1, since the core wire and the terminal are welded in a wide range by ultrasonic welding, they are hardly affected by the deviation of the electrical contact due to such a difference in volume change. . Therefore, an oxide film is rarely formed on the wire at the location where the electrical contact is shifted, and as a result, an increase in electrical resistance between the core wire and the terminal is prevented.

  In addition, when both ends of a single electric wire are ultrasonically welded, it is necessary to first ultrasonically weld one end (tip end) and then ultrasonically weld the other end (base end). According to this manufacturing method, first, two electric wires (for example, the first electric wire 10 and the second electric wire 20) are prepared, and after ultrasonically welding the distal end portion of each electric wire to the terminal, these two electric wires are used. Is crimped by a crimping member (connecting portion) to be conducted, so that it is not necessary to further apply ultrasonic vibration to the proximal end portion of the electric wire after welding the terminal to the distal end portion of the electric wire. That is, since the ultrasonic vibration is not transmitted to the ultrasonic welded tip portion, it is possible to prevent the connection strength from being lowered or peeled and broken at the ultrasonic welded tip portion.

  Furthermore, according to this embodiment, since the connection part which electrically connects the strand of a 1st electric wire and the strand of a 2nd electric wire is formed with the same material as these strands, a connection part Even when the temperature rises or falls, the electrical contact between the first electric wire and the second electric wire is hardly shifted. Therefore, good conduction between the first electric wire and the second electric wire is achieved.

  In addition, according to this manufacturing method, the strands in the proximal end exposed portion of the first electric wire are integrated by ultrasonic welding, and similarly, the strands in the proximal end exposed portion of the second electric wire are also ultrasonically welded. Are integrated. Thereby, the increase in the electrical resistance between the proximal end exposed portion of the first electric wire and the proximal end exposed portion of the second electric wire is suppressed, and good conduction between the first electric wire and the second electric wire is achieved. Is planned. In addition, although it is not always necessary to ultrasonically weld the proximal end exposed portion, it is preferable to ultrasonically weld the proximal end exposed portion from the viewpoint of achieving good conduction between the first electric wire and the second electric wire.

  In addition, since the serrations described above are provided in the connection portion used in the present manufacturing method, when the connection portion is caulked, the oxide film of the strand located outside is effectively destroyed (FIG. 8). reference). Therefore, the electrical connection between the first electric wire and the second electric wire is further improved. In addition, although it is not necessary to provide such a serration in a connection part, it is preferable to provide a serration in a connection part from a viewpoint of aiming at favorable conduction | electrical_connection with a 1st electric wire and a 2nd electric wire.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and it goes without saying that the present invention may be implemented in various forms within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 1 Electric wire with a terminal 10 1st electric wire 11,21 Insulation film 12,22 Core wire 13,23 Elementary wire 20 2nd electric wire 30 Connection part 31 Front surface 32 1st through-hole 32A 1st inner peripheral surface 32B, 33B Protrusion 33 2nd through-hole 33A 2nd inner peripheral surface 35 Back surface 40 1st terminal 41,51 Electric wire connection part 42,52 Extension part 43,53 Lance locking hole 44,54 Bolt hole 50 2nd terminal 112A 122A Tip exposed portion 112B, 122B Base end exposed portion 500 Anvil 600 Horn

Claims (3)

By peeling the insulating film covering the tip of the first electric wire and exposing the core wire composed of a plurality of strands, the first tip exposed portion is formed at the tip,
By peeling the insulating film covering the base end portion of the first electric wire and exposing a core wire composed of a plurality of strands, a first base end exposed portion is formed at the base end portion,
The first terminal is welded to the first tip exposed portion of the first electric wire by applying ultrasonic vibration after placing the first tip exposed portion on the first terminal;
By peeling the insulating film covering the tip of the second electric wire and exposing a core wire composed of a plurality of strands, a second tip exposed portion is formed at the tip,
By peeling the insulating film covering the base end portion of the second electric wire and exposing a core wire composed of a plurality of strands, a second base end exposed portion is formed at the base end portion,
The second terminal is welded to the second tip exposed portion of the second electric wire by applying ultrasonic vibration after placing the second tip exposed portion on the second terminal,
After the welding of the first terminal to the first electric wire and the welding of the second terminal to the second electric wire, the first proximal end exposed portion of the first electric wire and the second electric wire By crimping the second base end exposed portion of the electric wire with a crimping member made of the same material as the strands of the first and second electric wires, the first electric wire and the second electric wire The manufacturing method of the electric wire with a terminal characterized by connecting.   Before the first terminal is welded to the first electric wire, it is exposed at the first proximal end exposed portion by applying ultrasonic vibration to the first proximal end exposed portion of the first electric wire. The manufacturing method of the electric wire with a terminal according to claim 1, wherein a plurality of strands constituting the core wire are welded.   Before the second terminal is welded to the second electric wire, an ultrasonic vibration is applied to the second proximal end exposed portion of the second electric wire so as to be exposed at the second proximal end exposed portion. The manufacturing method of the electric wire with a terminal according to claim 1 or 2 characterized by welding a plurality of strands which constitute a core wire which carried out.

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