JP2010162565A - Method for manufacturing electric component, arc welding apparatus, and arc welding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing electric components, an arc welding apparatus, and an arc welding method by which one end of a conductor is arc-welded to one terminal piece, and also another end of the conductor is arc-welded to another terminal piece simultaneously with a single arc welding apparatus. <P>SOLUTION: An arc current feeder 10 has a negative electrode and a ground electrode, and a first torch electrode 12A is electrically connected to the negative electrode. A second torch electrode 17A is electrically connected to the ground electrode. In a method for manufacturing electronic components, the torch opposing process is executed, in which the first torch electrode 12A is opposite to one end 103C of a winding 103, and the second torch electrode 17A is opposite to the other end 103D of the winding 103. Next, the arc discharge is executed from the first torch electrode 12A to one end 103C of the winding 103, and at the same time, the arc discharge is performed from the second torch electrode 17A of the second torch 17 to another end 103D of the winding 103. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electronic component manufacturing method, an arc welding apparatus, and an arc welding method, and more particularly, an electronic component manufacturing method configured by arc welding one end and other end of a conducting wire to a conductor, and an electronic component manufacturing method. The present invention relates to an arc welding apparatus and arc welding method.

2. Description of the Related Art Conventionally, an electronic component such as a coil component has a configuration including a conductive wire and a terminal fitting that forms a terminal electrode. The terminal fittings are provided as many as one end and the other end of the conducting wire, and one end and the other end of the conducting wire are welded to the terminal fitting by arc welding one by one and electrically connected and connected. As for the connection to the terminal fittings at one end and the other end of the conducting wire, first, the insulation coating of the one end and the other end of the conducting wire is peeled off. Next, one end of the conductor is arc welded to one terminal fitting whose end is grounded, and the other end of the conductor is then arc welded to another terminal fitting whose end is grounded. Is called. A method for performing such connection is described in, for example, Japanese Patent Application Laid-Open No. 2000-190068.
Japanese Unexamined Patent Publication No. 2000-190068

  However, in the conventional method described in the above publication, as described above, after arc-welding one end of the conducting wire to one terminal fitting, the other end of the conducting wire is arc-welding to another terminal fitting. It was necessary to perform the arc welding process once. In this way, when arc welding one end of the conducting wire to one terminal fitting and arc welding the other end of the conducting wire to another terminal fitting without arc welding in this order, the arc welding apparatus 2 A stand is required, and it is difficult to reduce the cost for manufacturing electronic components.

  Therefore, the present invention provides a method for manufacturing an electronic component capable of arc welding one end of a conducting wire to one terminal fitting with one arc welding apparatus and simultaneously arc welding the other end of the conducting wire to another terminal fitting, An object is to provide an arc welding apparatus and an arc welding method.

  In order to solve the above problems, the present invention includes a first conductor portion having a first welded portion, a second conductor portion having a second welded portion, and a conductor, and the first welded portion and the conductor. A method of manufacturing an electronic component for manufacturing an electronic component in which one end portion of the second welded portion is welded and the second welded portion and the other end portion of the conductive wire are welded, the first electrode and the second electrode, A first torch electrically connected to the first electrode, and a second torch electrically connected to the second electrode. One torch is made to face one end of the conducting wire or the first welded portion arranged close to one end of the conducting wire, and the second torch is made to one end of the conducting wire or the first welded portion. Opposite to the other end of the conducting wire that conducts to one end of the conducting wire or to the first welded portion. A torch facing step that opposes the second welded part disposed in the vicinity of the other end of the wire, and arc discharge from the first torch to one end part of the conductive wire or the first welded part, Arc discharge from the second torch to one end of the conducting wire or the other end of the conducting wire connected to the first welded portion, or the first conducting to the one end of the conducting wire or the first welded portion Arc discharge from the second torch to two welded parts to electrically connect one end of the conductor and the first welded part, and at the same time the other end of the conductor and the second welded part And a method of manufacturing an electronic component having an arc discharge process for electrically connecting the two.

  One arc current supply device having a first electrode and a second electrode, a first torch electrically connected to the first electrode, and a second torch electrically connected to the second electrode The first torch of the arc welding apparatus is opposed to one end portion of the conducting wire or the first welded portion disposed in the vicinity of one end portion of the conducting wire, and the second torch is placed on one end portion of the conducting wire or the first welded portion. A torch facing step of facing the other end of the conducting wire, or facing a second welded portion that is conducted to one end of the conducting wire or the first welded portion and is disposed near the other end of the conducting wire; Arc discharge from the first torch to one end of the wire or the first welded portion, and at the same time arc discharge from the second torch to the other end of the lead conducting to the one end of the lead wire or the first welded portion Or conduct to one end of the conductor or the first welded part Arc discharge from the second torch to the second welded part electrically connects the one end of the conducting wire and the first welded part, and at the same time electrically connects the other end of the conducting wire and the second welded part. And connecting one end of the conductor to the first welded part in a single arc discharge operation and connecting the other end of the conductor to the second welded part. It can be electrically connected and connected. For this reason, after welding the one end part of a conducting wire, and the 1st to-be-welded part with one end part or the 1st to-be-welded part of a conducting wire facing one torch, the other end of a conducting wire to the one torch It is not necessary to perform arc welding twice by exchanging the welding locations such that the other end portion of the conductor and the second welded portion are welded with the portion or the second welded portion facing each other.

  Here, before performing the torch facing step, the first conductor portion and the second conductor portion are provided in a non-conductive state, and in the torch facing step, the first torch is opposed to one end of the conducting wire. And the second torch is opposed to the other end of the conducting wire, and in the arc discharge step, arc discharge is performed from the first torch to one end of the conducting wire, and at the same time from the second torch to the other end of the conducting wire. It is preferable to arc discharge.

  Before performing the torch facing step, the first conductor portion and the second conductor portion are provided in a non-conductive state. In the torch facing step, the first torch is made to face one end of the conducting wire and the second torch is placed on the other side of the conducting wire. In the arc discharge process, the arc is discharged from the first torch to one end of the conducting wire, and at the same time, the arc is discharged from the second torch to the other end of the conducting wire. After the insulation coating at one end of the conducting wire and the insulation coating at the other end are simultaneously peeled off by arc discharge, the other end of the conducting wire and the second welding are simultaneously welded to the first welding portion and the first welding portion. The part can be welded. For this reason, it is not necessary to perform the process of peeling off the insulating coating on one end and the other end of the conducting wire, and it is possible to prevent the melting of the one end and the other end of the conducting wire from being inhibited by the insulating coating. . As a result, it is possible to reliably weld, and it is possible to prevent a part of the insulation coating from remaining and making a break during welding. In addition, it is not necessary to connect the one end of the conducting wire to be welded with the first conductor by, for example, caulking with a caulking piece before arc discharge, and similarly, the other end of the conducting wire to be welded. It is not necessary to make the part and the second conductor part conductive.

  Moreover, it is preferable that the 1st to-be-welded part is provided with the 1st fusion auxiliary piece which protrudes from this 1st weld part so that this conducting wire may be met. Since the 1st to-be-welded part is provided with the 1st fusion auxiliary piece which protrudes from the 1st weld part so that a lead may be met, the welding ball by arc welding can be formed reliably.

  Moreover, it is preferable that the 2nd to-be-welded part is provided with the 2nd fusion auxiliary piece which protrudes from this 2nd weld part so that this conducting wire may be met. Since the second welded auxiliary piece protruding from the second welded portion is also provided along the conductive wire in the second welded portion, the welding ball by arc welding is surely provided at both one end and the other end of the conductive wire. Can be formed.

  Further, the first conductor portion and the second conductor portion are provided in a conductive state before performing the torch facing step, and in the torch facing step, the first torch is opposed to the first welded portion. And the second torch is made to face the second welded portion, and in the arc discharge step, arc discharge from the first torch to the first welded portion is performed simultaneously with the second torch from the second torch. It is preferable that an arc discharge is performed on the welded portion, and a step of bringing the first conductor portion and the second conductor portion into a non-conductive state after the arc discharge step.

  Before performing the torch facing step, the first conductor portion and the second conductor portion are provided in a conductive state. In the torch facing step, the first torch is made to face the first welded portion, and the second torch is moved to the second position. In the arc discharge process, the arc is discharged from the first torch to the first welded part, and at the same time, the second torch arcs to the second welded part. Since the first conductor portion and the second conductor portion are in a non-conductive state, the first conductor portion and the second conductor portion are integrally connected to form a lead frame and the first conductor portion and the second conductor portion. Arc welding can be performed when the two conductor portions are in a conductive state.

  In addition, the first conductor portion and the second conductor portion are provided in a non-conductive state before the torch facing step, and the one end portion of the conductive wire and the first welded portion are provided before the arc discharge step. An end conductor conducting step for bringing the other end portion of the conducting wire and the second welded portion into a conducting state, and in the torch facing step, the first torch is placed in the conducting state. The second torch is opposed to the second welded portion and the second torch is opposed to the second welded portion, and in the arc discharge process, the second discharge is arced from the first torch to the first welded portion at the same time. It is preferable to perform arc discharge from the torch to the second welded portion.

  Before performing the torch facing step, the first conductor portion and the second conductor portion are provided in a non-conductive state, and before the arc discharge step, the one end portion of the conducting wire and the first welded portion are in a conductive state. And an end conductor conducting step for bringing the other end of the conducting wire and the second welded portion into a conducting state. In the torch facing step, the first torch is opposed to the first welded portion and the second torch is In the arc discharge process, one end portion of the conducting wire is arc-discharged from the first torch to the first welded portion and simultaneously from the second torch to the second welded portion. And the first welded portion are electrically connected in advance, and the other end portion of the conducting wire and the second welded portion are electrically conducted in advance, so that it is possible to ensure welding between the one end portion of the conducting wire and the first welded portion. It is possible to reliably weld the other end portion of the conducting wire and the second welded portion.

  Further, in the arc discharge step, an assist gas is supplied to a portion where the first welded portion and one end portion of the conducting wire are welded and the vicinity thereof, and the other portion of the second welded portion and the conducting wire are supplied. It is preferable to supply assist gas to a portion where the end portion is welded and its vicinity. Here, supplying the assist gas to a portion where the first welded portion and one end of the conducting wire are welded and the vicinity thereof means that the assist gas is supplied from the first torch or an assist provided separately. This means that the assist gas is supplied from the gas supply nozzle. Similarly, supplying the assist gas to the portion where the second welded portion and the other end of the conductor are welded and the vicinity thereof means that the assist gas is supplied from the second torch or an assist provided separately. This means that the assist gas is supplied from the gas supply nozzle.

  In the arc discharge process, the assist gas is supplied to a portion where the first welded portion and one end portion of the conducting wire are welded and the vicinity thereof, and the second welded portion and the other end portion of the conducting wire are welded. Since the assist gas is supplied to the portion and the vicinity thereof, the effect of the assist gas can be obtained in welding between the one end portion of the conducting wire and the first welded portion, and the other end portion of the conducting wire and the second welded portion. The effect of the assist gas can be obtained in welding with the part.

  Further, in the arc discharge step, the amount of melt at one end of the first welded part and the conducting wire and the second welded part are controlled by controlling the supply amount of the assist gas in the first torch and the second torch. It is preferable to control the melting amount of the other portion and the other end portion of the conductor.

  In the arc discharge process, by controlling the supply amount of the assist gas in the first torch and the second torch, the melting amount of the first welded part and one end of the conducting wire and the melting of the second welded part and the other end of the conducting wire are controlled. Since the amount is controlled, it is possible to minimize variations in the welding condition between the one end portion of the conducting wire and the first welded portion and the welding condition between the other end portion of the conducting wire and the second welded portion.

  In addition, the present invention electrically connects one end portion of the conducting wires arranged close to each other and the first welded portion of the first conductor portion by arc welding and the other end portion of the conducting wires arranged close to each other. The second welded portion of the second conductor portion is electrically connected by arc welding, and the first conductor portion and one end portion of the conducting wire are welded, and the second conductor portion and the conducting wire are connected to each other. An arc welding apparatus for manufacturing an electronic component in which the other end is welded, comprising: a single arc current supply apparatus having a first electrode and a second electrode; and an electrical connection to the first electrode A first torch that is connected and can be opposed to one end of the conducting wire, or can be opposed to the first welded portion disposed in the vicinity of the one end, and electrically connected to the second electrode; Can be opposed to the other end of the conductive wire, or can be opposed to the second welded portion disposed in the vicinity of the other end A second torch, and arc discharge from the first torch to the first welded part disposed in the vicinity of one end of the conductor or one end of the conductor, and at the same time one end of the conductor or the Arc discharge from the second torch to the other end portion of the conducting wire conducting to the first welded portion, or conducting to one end portion of the conducting wire or the first welded portion and near the other end portion of the conducting wire Arc discharge from the second torch to the second welded portion arranged in proximity to electrically connect one end portion of the conductive wire and the first welded portion and the other end portion of the conductive wire at the same time An arc welding apparatus for electrically connecting the second welded portion is provided.

  One arc current supply device having a first electrode and a second electrode, and a first electrically connected to the first electrode and capable of being opposed to one end portion of the conducting wire or disposed close to one end portion A first torch that can be opposed to the welded portion, and a second electrode that is electrically connected to the second electrode and can be opposed to the other end of the conductive wire, or can be opposed to the second welded portion in the vicinity of the other end Since the second torch is provided, an arc discharge is generated from the first torch to the first welded portion disposed in the vicinity of one end portion of the conducting wire or in the vicinity of the one end portion of the conducting wire. The second torch arcs from the second torch to the other end of the conductor conducting to the first welded part, or the second connected to the one end of the conductor or the first welded part and adjacent to the other end of the conductor. Arc discharge can be performed from the second torch to the welded part. Parts and the other end portion of the same time lead when electrically connecting the first welded portion and the second welded portion can be electrically connected.

  Further, the present invention provides a reverse method in which the workpiece is melted by arc discharge from the torch to the workpiece with a relatively positive potential and a workpiece having a relatively negative potential. An arc welding method having an electrode discharge process is provided.

  Since the torch is a relatively positive potential and the work piece is a relatively negative potential, and the reverse electrode discharge process is performed to melt the work piece by arc discharge from the torch to the work piece, The object to be welded can be melted on the negative electrode side and welding can be performed.

  As mentioned above, according to this invention, manufacture of the electronic component which can arc-weld the other end part of conducting wire to another terminal metal fitting at the same time arc-welding one end part of conducting wire to one terminal metal fitting with one arc welding apparatus. A method, an arc welding apparatus, and an arc welding method can be provided.

Schematic which shows the arc welding apparatus by embodiment of this invention. Schematic which shows a mode that the arc welding was performed with the arc welding apparatus by embodiment of this invention. The perspective view which shows the 1st connection part of the 1st terminal welded with the arc welding apparatus by embodiment of this invention, and the 2nd connection part of the 2nd terminal. The perspective view which shows the 1st connection part of the 1st terminal welded with the arc welding apparatus by embodiment of this invention, a 2nd terminal, the one end part of a coil | winding, and the other end part of a coil | winding. A weld ball is formed by the first connecting portion of the first terminal and one end of the winding, which is welded by the arc welding apparatus according to the embodiment of the present invention, and the second connecting portion of the second terminal and the other of the winding. The perspective view which shows the state in which the weld ball was formed in the edge part. The perspective view which shows the coil components manufactured by the modification of the manufacturing method of the electronic component by embodiment of this invention. The principal part perspective view which shows the state by which the one end part of the coil | winding was crimped with the crimping piece of the 1st connection part before performing the arc discharge process of the modification of the manufacturing method of the electronic component by embodiment of this invention. Schematic which shows a mode that the arc discharge process is performed in the modification of the manufacturing method of the electronic component by embodiment of this invention. Schematic which shows the state before winding a coil | winding around the core part of a drum core in the modification of the manufacturing method of the electronic component by embodiment of this invention. Schematic which shows a mode that the coil | winding is wound around the core part of the drum core in the modification of the manufacturing method of the electronic component by embodiment of this invention. Schematic which shows a mode that the part of the excess coil | winding is cut and removed in the modification of the manufacturing method of the electronic component by embodiment of this invention. Schematic which shows a mode that the arc discharge process is performed in the modification of the manufacturing method of the electronic component by embodiment of this invention. The modification of the manufacturing method of the electronic component by embodiment of this invention shows a mode that the lead frame frame part was cut | disconnected from the 1st terminal and the 2nd terminal, and the 1st terminal and the 2nd terminal were made into the non-conduction state. Schematic.

  An arc welding apparatus according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the arc welding apparatus 1 includes a single arc current supply device 10, and the arc current supply device 10 has a negative electrode and a ground electrode (not shown). A voltage of 15 KV or more can be instantaneously applied to the negative electrode with respect to the negative electrode, and a voltage of about several volts can be continuously applied. Further, the arc current supply device 10 is configured to allow a current of 8 A or more to flow through these negative electrodes and ground electrodes (not shown). The negative electrode corresponds to the first electrode and the electrode on the relatively negative side. The ground electrode corresponds to the second electrode and a relatively positive electrode.

  As shown in FIG. 1, one end of an insulating coated conductor 11 is connected to the negative electrode, and a first torch 12 is provided at the other end of the insulating coated conductor 11. The first torch 12 is electrically connected to a negative electrode (not shown) through an insulation-coated conductive wire 11, and is formed of a first torch electrode 12A made of tungsten and having a substantially rod shape, and a substantially cylindrical first torch electrode 12A. An inner nozzle (not shown) coaxially provided on the first torch electrode 12A so as to be mounted, and an inner nozzle (not shown) which is substantially cylindrical, are coaxially connected to the first torch electrode 12A. The nozzle 12B is provided, and between the inner peripheral surface of the nozzle 12B and the outer peripheral surface of the inner nozzle (not shown), from the proximal end side to the distal end side of the first torch electrode 12A, that is, An assist gas flow path (not shown) through which the assist gas 13 can flow from the upper side to the lower side of 1 is formed. The tip of the first torch electrode 12A protrudes from the tip of the inner nozzle (not shown) and the nozzle 12B, and can face one end 103C of a winding 103 serving as a coil component described later.

  In addition, an assist gas supply nozzle having a nozzle port disposed so as to face one end portion 103A of a winding 103 described later and a portion to be welded to a first melting auxiliary piece 152A described later and the first melting auxiliary piece 152A. 14 is provided. Similarly, the assist gas in which the nozzle port is disposed so as to face the second melting auxiliary piece 162A and the second welding auxiliary piece 162A, which will be described later, is the other end 103B of the winding 103 described later. A supply nozzle 19 is provided.

  As shown in FIG. 1, one end of an insulation coated conductor 16 is connected to the ground electrode as shown in FIG. 1, and a second torch 17 is provided at the other end of the insulation coating conductor 16. An intermediate portion of the insulation coated conductor 16 is grounded. The second torch 17 includes a second torch electrode 17A that is electrically connected to a ground electrode (not shown) through an insulation-coated conductive wire 16 and is made of tungsten and has a substantially rod shape. The second torch electrode 17A has a substantially cylindrical shape. An inner nozzle (not shown) coaxially provided on the second torch electrode 17A so as to be mounted, and an inner nozzle (not shown) that is substantially cylindrical, are coaxially connected to the second torch electrode 17A. The nozzle 17B is provided, and between the inner peripheral surface of the nozzle 17B and the outer peripheral surface of the inner nozzle (not shown), from the proximal end side to the distal end side of the second torch electrode 17A, that is, An assist gas flow path through which the assist gas 18 can flow from the upper side to the lower side of 1 is formed. The tip of the second torch electrode 17A protrudes from the tip of the inner nozzle (not shown) and the nozzle 17B, and can be opposed to the other end 103D of the winding 103 serving as a coil component described later.

  As described above, the tip of the first torch electrode 12A faces the one end 103C of the winding 103, which will be described later, and the tip of the second torch electrode 17A is the other of the winding 103, which will be described later. An arc discharge process, which will be described later, is performed in a state of facing the end 103D. At this time, the first torch electrode 12A has a relatively negative potential, and the one end 103C of the winding 103, which is a melt, is relatively Becomes a positive potential. Further, the second torch electrode 17A is configured to have a relatively positive potential, and the other end 103D of the winding 103 that is a melted material has a relatively negative potential.

  An object to be welded by arc welding is a member constituting a coil component used as a choke coil in various electronic devices. The coil component 101 (FIG. 5) includes a drum core 102, a winding 103 (FIG. 4 and the like), and a terminal fitting 104. One end 103A of the winding 103 and a first terminal 105 described later are welded. Then, the other end 103B of the winding 103 and a second terminal 106 described later are welded.

  The drum core 102 includes, for example, a Ni—Zn-based magnetic material as a base material, and includes a core portion (not shown) and a pair of flange portions 102B and 102C. A winding core (not shown) has a substantially columnar shape, and a winding 103 is wound around it. The pair of flange portions 102B and 102C are respectively the same shape and substantially disk shape, and are provided integrally with the core portion at both axial ends of the core portion (not shown). A winding core (not shown) and the pair of flanges 102B and 102C are arranged coaxially.

  The winding 103 (FIG. 4) is made of an insulation-coated conductive wire in which a polyurethane coating is applied to a copper wire. The diameter of the winding 103 including the coating is about 0.4 mm, and the thickness of the coating is 0. It is about 03 mm. Therefore, the diameter of the copper wire excluding the coating is about 0.34 mm. The winding 103 is wound around a winding core (not shown), and as described above, the one end 103A (FIG. 5 and the like) and the other end 103B are connected to the first terminal 105 and the second terminal 106, respectively. Yes.

  The terminal fitting 104 is made of a copper alloy such as phosphor bronze, and, as shown in FIG. 3, is composed of a first terminal 105 and a second terminal 106 that are in a non-conductive state before the torch facing step described later. Yes. The first terminal 105 and the second terminal 106 are arranged in parallel and fixed to the flange 102B, and are configured symmetrically in a plane orthogonal to the parallel direction. Therefore, only the first terminal 105 will be described, and the description of the second terminal 106 will be omitted. The first terminal 105 corresponds to a first conductor portion, and the second terminal 106 corresponds to a second conductor portion.

  The first terminal 105 is mainly composed of a first mounting portion 151 and a first connecting portion 152. The first mounting portion 151 is composed of a substantially rectangular plate, and one surface side (the lower surface in FIG. 3) serves as a joining portion with the drum core 102, and the other surface side (the upper surface in FIG. 3) is illustrated. It is a mounting location with a circuit board (not shown). A first connecting portion 152 is provided at one end of the first mounting portion 151 in the longitudinal direction. The first connecting portion 152 corresponds to a first welded portion.

  The first connecting portion 152 is connected to the first mounting portion 151 through a bent portion so that the first connecting portion 152 is parallel to the plane of the first mounting portion 151 in a state where the winding 103 is not yet connected. It is lifted (lowered in FIG. 3) on one surface side of the portion 151. The substantially central portion in the direction connecting the first terminal 105 and the second terminal 106 in the raised portion of the first connecting portion 152 is perpendicular to the plane of the first mounting portion 151 as shown in FIG. In the direction from the flange portion 102C toward the flange portion 102B, that is, the upper portion of FIG. 1 is bent and protruded, and the first fusion auxiliary piece 152A is bent. A portion of the first connecting portion 152 forms a winding hooking recess 152 a having a shape cut out in the direction of the first mounting portion 151. As shown in FIG. 4, the winding hanging recess 152 a is configured to be hung by a portion that becomes one end 103 </ b> A of the winding 103 described later. When the one end 103 </ b> A of the winding 103 is thus hooked, the first melting auxiliary piece 152 </ b> A is in a state along the one end 103 </ b> A of the winding 103 as shown in FIG. 4. And the surface of the 1st fusion auxiliary piece 152A which opposes one end part 103A of the coil | winding 103 when it has become in this way, ie, the 1st fusion | melting which the code | symbol "152A" has just pointed in FIG. The surface of the auxiliary piece 152A is plated with tin, nickel, or the like. For this reason, the first melting auxiliary piece 152A is easily melted during arc welding in an arc discharge process described later.

  Similar to the first terminal 105, the second terminal 106 has a second mounting portion 161 and a second connection portion 162. The portion of the second connecting portion 162 of the second terminal 106 corresponding to the first melting auxiliary piece 152A forms a second melting auxiliary piece 162A, and the winding melting recess 162a of the second terminal 106 has a first melting portion. As in the auxiliary piece 152A, as shown in FIG. 4, a portion that becomes the other end portion 103B of the later-described winding 103 is hung. When the other end portion 103B of the winding 103 is thus hooked, the second melting auxiliary piece 162A is in a state along the other end portion 103B of the winding 103 as shown in FIG. . Then, similarly to the first melting auxiliary piece 152A, the surface of the second melting auxiliary piece 162A facing the one end 103B of the winding 103 when it is in this state, that is, just the reference numeral in FIG. The surface of the second melting auxiliary piece 162A pointed to by “162A” is plated with tin, nickel, or the like. For this reason, the second melting auxiliary piece 162A is arc welded in an arc discharge process described later. It is easy to melt at the time.

  Since the first connecting portion 152 is provided with the first melting auxiliary piece 152A protruding from the first connecting portion 152 along the one end portion 103A of the winding 103, the welding balls 101A, 101B by arc welding are provided. (FIG. 5) can be formed reliably. Further, since the second connecting portion 162 is also provided with the second melting auxiliary piece 162A protruding from the second connecting portion 162 along the winding 103, one end portion 103A and the other end portion of the winding 103 are provided. Both 103B and the welding balls 101A and 101B by arc welding can be reliably formed.

  In the electronic component manufacturing method for manufacturing the coil component described above, first, the terminal fitting 104 is fixed to one flange portion 102B of the drum core 102 with an adhesive or the like. At this time, in the first terminal 105 and the second terminal 106, the longitudinal directions of the first mounting portion 151 and the second mounting portion 161 are substantially parallel, respectively, and the directions of the first connecting portion 152 and the second connecting portion 162 are the same. It arrange | positions so that it may become. Next, the winding 103 is wound around a winding core (not shown), and one end 103A and the other end 103B of the winding 103 are pulled out from the winding portion of the winding 103 in the winding core (not shown).

  Next, as shown in FIG. 4, one end 103 </ b> A of the winding 103 is hung on the winding hooking recess 152 a so that the first melting auxiliary piece 152 </ b> A is in a state along the one end 103 </ b> A of the winding 103. The other end portion 103 </ b> B of the wire 103 is hung on the winding hanging recess 162 a so that the second melting auxiliary piece 162 </ b> A is along the other end portion 103 </ b> B of the winding 103. Next, the windings 103 are respectively cut in the vicinity of the positions of the one end 103A and the other end 103B of the winding 103, and as shown in FIG. 1, the one end 103A and the other end 103B of the winding 103 are cut. It is assumed that the axial direction is a direction perpendicular to the plane of the first mounting portion 151 and the second mounting portion 161 and directed in a direction from the flange portion 102C toward the flange portion 102B. At this time, one end 103A of the winding 103 protrudes upward in FIG. 1 from the first melting auxiliary piece 152A, and similarly, the other end 103B of the winding 103 is higher in FIG. 1 than the second melting auxiliary piece 162A. Protruding to

  Next, a torch facing process is performed. In the torch facing step, the axial direction of the first torch electrode 12 </ b> A of the first torch 12 of the arc welding apparatus 1 is made to coincide with the axial direction of the one end 103 </ b> A of the winding 103. The second torch electrode 17A is wound with the one end 103C (FIG. 1) facing and the axial direction of the second torch electrode 17A of the second torch 17 aligned with the axial direction of the other end 103B of the winding 103. The other end 103D of 103 is made to oppose.

  Next, an arc discharge process is performed. In the arc discharge process, a voltage of −15 KV is instantaneously applied to the negative electrode by the arc current supply device 10 and current is supplied from the arc current supply device 10 to the first torch 12 and the second torch 17. The applied voltage is about several volts after energization. The supplied current is about 1 A for the first 0.7 msec, and then 8 A is supplied for 2.0 msec. As a result, arc discharge from the first torch electrode 12A of the first torch 12 of the arc welding apparatus 1 facing the one end 103C of the winding 103 to the one end 103C of the winding 103 is performed at the same time. Arc discharge is performed from the second torch electrode 17 </ b> A of the second torch 17 of the arc welding apparatus 1 facing the other end 103 </ b> D to the other end 103 </ b> D of the winding 103. Due to this arc discharge, one end 103A of the winding 103 and the first connecting portion 152 are electrically connected to form a weld ball 101A (FIG. 5), and at the same time, the other end 103B of the winding 103 and the second connecting portion. The part 162 is electrically connected to form the weld ball 101B. More specifically, the first melting auxiliary piece 152A of the first connecting portion 152 is mainly melted to form the welding ball 101A, and the second melting auxiliary piece 162A of the second connecting portion 162 is mainly melted to weld the welding ball. 101B is formed. The arc discharge process corresponds to a reverse electrode discharge process.

  During the arc discharge, argon gas continues to be supplied as the assist gases 13 and 18 in the assist gas passage (not shown) of the first torch 12 and the assist gas passage (not shown) of the second torch 17 and assists. From the gas supply nozzle 14 to the end portion 103A of the winding 103 that is welded to the first melting auxiliary piece 152A and the first melting auxiliary piece 152A, and from the assist gas supply nozzle 19 to the winding Air is continuously supplied to the second melting auxiliary piece 162A and the second welding auxiliary piece 162A, which is the other end portion 103B of 103, and the second welding auxiliary piece 162A. Argon gas prevents variations in the landing points of the arc discharge as much as possible, and more oxygen than necessary contacts the first torch electrode 12A and the second torch electrode 17A, causing the first torch electrode 12A and the second torch electrode 17A to deteriorate. To prevent. Moreover, the soot generated by arc discharge can be blown away. Oxygen contained in the air can completely burn the insulating coating to form carbon dioxide and prevent generation of soot.

  Moreover, the argon gas and oxygen amount supplied during arc discharge are adjusted. For example, melting can be promoted by supplying a larger amount of the assist gas 13 or 18 to the one with a lower degree of melting. By this adjustment, it is possible to control the melting amount of the one end portion 103A of the winding 103, the first connecting portion 152, the other end portion 103B of the winding 103, and the second connecting portion 162. And the welding condition between the first connecting part 152 and the welding condition between the other end part 103B of the winding 103 and the second connecting part 162 can be minimized. As a result, a weld ball 101A formed by welding one end 103A of the winding 103 and the first connecting portion 152, and a weld formed by welding the other end 103B of the winding 103 and the second connecting portion 162. The ball 101B can be formed in substantially the same shape and substantially the same size.

  Further, since the assist gases 13 and 18 are supplied from the first torch 12 and the second torch 17, the effects of the assist gases 13 and 18 are obtained in welding the one end portion 103A of the winding 103 and the first connection portion 152, respectively. In addition, the effects of the assist gases 13 and 18 can be obtained in the welding of the other end portion 103B of the winding 103 and the second connecting portion 162.

  Also, a torch facing step in which the first torch electrode 12A is opposed to one end portion 103A of the winding 103 and the second torch electrode 17A is opposed to the other end portion 103B of the winding 103, and the one end portion 103A of the winding 103 And the arc discharge process of arcing from the second torch electrode 17A to the other end 103B of the winding 103 simultaneously with the arc discharge from the first torch electrode 12A. One end portion 103A of the winding 103 can be electrically connected to the first connecting portion 152 and simultaneously connected, and the other end portion 103B of the winding 103 can be electrically connected to the second connecting portion 162 for connection. . Therefore, after one end 103A of the winding 103 is opposed to one torch and the one end 103A of the winding 103 and the first connecting portion 152 are welded, the winding 103 is then applied to the one torch. The other end 103B of the winding 103 is opposed to the other end 103B of the winding 103 and the second connecting portion 162 is welded, so that it is not necessary to perform welding twice by exchanging the welding locations.

  Moreover, since the reverse electrode discharge process is performed, the workpiece can be melted on the relatively negative electrode side, and welding can be performed.

  In addition, by setting the first 0.7 msec for supplying current to about 1 A, the insulating coating on one end portion 103A and the insulating coating on the other end portion 103B of the winding 103 can be simultaneously peeled off by arc discharge. With the insulation coating peeled off in this way, the one end 103A of the winding 103 and the first connecting portion 152 are welded, and at the same time, the other end 103B of the winding 103 and the second connecting portion 162 are welded. be able to.

  For this reason, it is not necessary to perform the process of peeling off the insulating coating of the one end portion 103A and the other end portion 103B of the winding 103, and the insulating coating prevents the melting of the one end portion 103A and the other end portion 103B of the winding 103. Can be prevented. As a result, it is possible to reliably weld, and it is possible to prevent a part of the insulation coating from remaining and making a break during welding. Further, before arc discharge, it is not necessary to electrically connect one end portion 103A of the winding 103 to be welded by, for example, caulking with the first terminal 105, and similarly, the winding to be welded. The other end portion 103B of 103 and the second terminal 106 need not be electrically connected. Through the above steps, the first connecting portion 152 of the first terminal 105 and the one end portion 103A of the winding 103 are welded, and the second connecting portion 162 of the second terminal 106 and the other end portion 103B of the winding 103 are welded. Coil parts that are electronic parts formed by welding are manufactured.

  The electronic component manufacturing method, arc welding apparatus, and arc welding method according to the present invention are not limited to the above-described embodiments, and various modifications and improvements are possible within the scope described in the claims. For example, in the present embodiment, in the torch facing step, the winding is performed with the axial direction of the first torch electrode 12A of the first torch 12 of the arc welding apparatus 1 aligned with the axial direction of the one end 103A of the winding 103. 103 is opposed to one end 103C of the second torch 17, and the axial direction of the second torch electrode 17A of the second torch 17 is made to coincide with the axial direction of the other end portion 103B of the winding 103 to be opposed to the other end 103D of the winding 103. In the arc discharge process, arc discharge is performed from the first torch 12 arranged in the torch facing process to the one end 103C of the winding 103 at the same time, and at the same time the second torch 17 is connected to the other end 103D of the winding 103. However, the present invention is not limited to this.

  For example, as shown in FIG. 6, before the torch facing process, the first terminal 205 as the first conductor part and the second terminal 206 as the second conductor part are provided in a non-conductive state, and the arc discharge process. End conductor conducting step of bringing the one end portion 103A of the winding 103 and the first connecting portion 252 into a conducting state and the other end portion 103B of the winding 103 and the second connecting portion 262 in a conducting state before In the torch facing step, the first torch electrode 12A is opposed to the first welded portion 252 which is the first welded portion disposed in the vicinity of the one end portion 103A of the winding 103, and the second torch electrode 17A is It is made to oppose the 2nd connection part 262 which is the 2nd to-be-welded part arrange | positioned near the other end part 103B vicinity of the coil | winding 103, and with respect to the 1st connection part 252 from the 1st torch electrode 12A in an arc discharge process. The second torch at the same time as the arc discharge It may be an arc discharge in the second passage line section 262 from the electrode 17A.

  More specifically, as shown in FIG. 6B, a first terminal 205 and a second terminal 206 having caulking pieces 252A and 252B are prepared. Then, before performing the torch facing process, the one end portion 103A of the winding 103 and the first connecting portion 252 are crimped so as to be sandwiched between the caulking pieces 252A and 252B which are bent in a U shape. The part 103A and the first connecting part 252 are electrically connected to each other, and the other end part 103B of the winding 103 and the second connecting part 262 are caulked so as to be sandwiched between caulking pieces bent into a U shape. By caulking, the other end portion 103B of the winding 103 and the second connection portion 262 are electrically connected to each other. As a result, the first connection portion 252 and the second connection portion 262 are electrically connected via the winding 103.

  In the first terminal 205 and the second terminal 206 in such a state, in the torch facing step, the first torch electrode 12A is made to face the first connecting portion 252 which is the first welded portion, and the second torch electrode 17A is made the second torch. In the arc discharge process, arc discharge is performed from the first torch electrode 12A to the first connection portion 252 instead of the one end 103C of the winding 103, and at the same time from the second torch electrode 17A to the winding. Arc discharge is performed not on the other end 103D of 103 but on the second connecting portion 262. By doing in this way, welding can be ensured with the one end part 103A of the winding 103 that is conducting in advance and the first connection part 252 that is the first welded part, and the winding 103 that is conducting beforehand. The other end portion 103B and the second connecting portion 262 as the second welded portion can be reliably welded.

  Further, before the torch facing step, the first terminal 205 as the first conductor portion and the second terminal 206 as the second conductor portion are brought into a conductive state, and in the torch facing step, the first torch electrode 12A is placed in the first covered state. In the arc discharge process, the first torch electrode 12A is opposed to the first connecting portion 252 and the second torch electrode 17A is made to face the second connecting portion 262. Simultaneously with the discharge, arc discharge may be performed from the second torch electrode 17 </ b> A to the second connection portion 262. And it is made to have the process of making a 1st conductor part and a 2nd conductor part into a non-conduction state after an arc discharge process.

  More specifically, as shown in FIG. 7, the first terminal 205 and the second terminal 206 are configured as a part of the lead frame, and the first terminal 205 and the second terminal 206 are formed before the torch facing process. The lead frame frame portion 201 </ b> C constituting a part of the lead frame is integrally and electrically connected to each other.

  In the first terminal 205 and the second terminal 206 in such a state, in the torch facing step, the first torch electrode 12A is made to face the portion of the first connection portion 252 that is disposed in the vicinity of the one end portion 103A of the winding 103. At the same time, the second torch electrode 17A is made to face the portion of the second connecting portion 262 disposed in the vicinity of the other end portion 103B of the winding 103, and in the arc discharge process, from the first torch electrode 12A to one end 103C of the winding 103. Instead, arc discharge is performed on the first connection portion 252, and at the same time, arc discharge is performed from the second torch electrode 17 </ b> A to the second connection portion 262 instead of the other end 103 </ b> D of the winding 103. Then, after the arc discharge process is completed, the lead frame frame portion 201C is cut from the first terminal 205 and the second terminal 206, and the first terminal 205 and the second terminal 206 are made non-conductive.

  Furthermore, there may be one caulking piece. More specifically, as shown in FIG. 9, the first terminal 305 and the second terminal 306 are configured as a part of the lead frame, and the first terminal 305 and the second terminal 306 are formed before the torch facing step. The lead frame frame portion 301 </ b> C constituting a part of the lead frame is integrally and electrically connected to each other. As shown in FIG. 9, when the drum core 102 is placed on the first terminal 305 and the second terminal 306, a plurality of pairs of drum cores 102 are arranged. A pair of caulking pieces 352A and 352A is provided on each side of each pair facing each other. Further, a melting auxiliary piece 352B is provided in a part of the first terminal 305 and the second terminal 306 and in the vicinity of the base of the caulking pieces 352A and 352A, respectively, and the winding 103 is a drum core 102 as will be described later. Further, the auxiliary melting piece 352B is configured to be in a state along the winding 103 by being wound around the caulking piece 352A.

  The winding 103 is wound and wound around the drum core 102 and the caulking piece 352A placed as shown in FIG. 9 as if writing one stroke. Specifically, the winding 103 drawn out from the nozzle 21 is connected to the caulking piece 352A of the second terminal 306 on which the left drum core 102 of the pair of upper right drum cores 102 in FIG. 9 is placed. Next, the first drum core 102 is wound around a winding core (not shown) of the left drum core 102, and the left drum core 102 of the upper right pair of drum cores 102 in FIG. 9 is placed. It is hung on the crimping piece 352A of the terminal 305.

  Next, in the same manner, the winding 103 drawn from the nozzle 21 is a second terminal on which the left drum core 102 of the pair of drum cores 102 in the lower left from the upper right in FIG. 9 is placed. 306 is hooked on a caulking piece 352A, and is then wound around a winding core (not shown) of the left drum core 102. The drum core 102 is hooked on the caulking piece 352A of the first terminal 305 on which the drum core 102 is placed.

  Similarly, this process is performed until the left drum core 102 of the lower left pair of drum cores 102 in FIG. 9 is hooked on the caulking piece 352A of the first terminal 305 on which the drum core 102 is placed. Next, the winding 103 drawn from the nozzle 21 is connected to the first terminal 305 on which the right drum core 102 of the lower left pair of drum cores 102 in FIG. 9 is placed. Next, the right drum core 102 of the drum core 102 that forms the lower left pair in FIG. 9 is placed on the caulking piece 352A and then wound around a winding core (not shown) of the right drum core 102. The second terminal 306 is hooked on the caulking piece 352A.

  Next, the right drum core 102 of the pair of drum cores 102 paired from the lower left to the upper right in FIG. 9 is hung on the caulking piece 352A of the first terminal 305, and the right drum core 102 9 is wound around a caulking piece 352A of the second terminal 306 on which the right drum core 102 of the pair of drum cores 102 that form a pair on the upper right from the lower left in FIG. 9 is wound. It is done. The same process is repeated until the right drum core 102 of the pair of drum cores 102 in the upper right pair in FIG. 9 is hooked on the caulking piece 352A of the second terminal 306 on which it is placed.

  Next, as shown in FIG. 10, all the caulking pieces 352A are bent so as to wrap the winding 103, and the windings 103 are caulked with the caulking pieces 352A to form the coil component 301 (FIG. 12). Excess winding 103 other than the wire 103 is cut and removed. Next, as shown in FIG. 11, in the torch facing step, the first torch electrode 12A is made to face one end 103A of the winding 103 and the second torch electrode 17A is made to face the other end 103B of the winding 103. In the arc discharge process, arc discharge is performed from the first torch electrode 12A to the one end 103C of the winding 103, and simultaneously, arc discharge is performed from the second torch electrode 17A to the other end 103D of the winding 103. Then, after completing the arc discharge process, as shown in FIG. 12, the lead frame frame portion 301C is cut from the first terminal 305 and the second terminal 306, and the first terminal 305 and the second terminal 306 are connected. Non-conducting state.

  In the present embodiment, the first torch electrode 12A is connected to the negative electrode and the second torch electrode 17A is connected to the ground electrode. However, the present invention is not limited to this. For example, the first torch electrode 12A has a potential that is relatively negative with respect to the second torch electrode 17A, and the second torch electrode 17A is relatively positive with respect to the first torch electrode 12A. For example, the second torch electrode 17A may be a positive potential instead of 0V.

  In the arc discharge process, the current supplied is about 1 A for the first 0.7 msec and then 8 A is supplied for 2.0 msec. However, the current value is not limited to this time. The arc discharge time and the current value may be appropriately optimized according to the thickness of the insulation coating and the thickness of the copper wire.

  Further, in the present embodiment, during the arc discharge, argon is used as the assist gases 13 and 18 in the assist gas passage (not shown) of the first torch 12 and the assist gas passage (not shown) of the second torch 17. While continuing to supply gas and continuing to supply air from the assist gas supply nozzles 14 and 19, it is not limited to this. For example, only by supplying argon gas as the assist gas 13, 18 in the assist gas passage (not shown) of the first torch 12 and the assist gas passage (not shown) of the second torch 17, from the assist gas supply nozzles 14, 19. There is no need to supply anything.

  Alternatively, only by supplying argon gas and air as the assist gas 13 and 18 in the assist gas passage (not shown) of the first torch 12 and the assist gas passage (not shown) of the second torch 17, the assist gas supply nozzle 14, It is not necessary to supply anything from 19. Alternatively, the argon gas continues to be supplied as the assist gas 13, 18 in the assist gas flow path (not shown) of the first torch 12 and the assist gas flow path (not shown) of the second torch 17, and from the assist gas supply nozzles 14, 19. You may continue supplying argon gas and air. Alternatively, argon gas and air are continuously supplied as the assist gas 13 and 18 in the assist gas passage (not shown) of the first torch 12 and the assist gas passage (not shown) of the second torch 17, and the assist gas supply nozzles 14 and 19. The argon gas and air may be continuously supplied from the air.

  In the present embodiment, the electronic component is a coil component, but is not limited to a coil component. Further, the number of windings and the number of terminals such as the first terminal are not limited to the number of the present embodiment.

  INDUSTRIAL APPLICABILITY The electronic component manufacturing method, arc welding apparatus, and arc welding method of the present invention are useful in the field of electronic components in which terminal fittings and conductive wires are arc-welded.

DESCRIPTION OF SYMBOLS 1 Arc welding apparatus 10 Arc current supply apparatus 12 1st torch 13, 18 Assist gas 17 2nd torch 101, 301 Coil component 102 Drum core 103 Winding 104 Terminal metal fittings 105, 205, 305 First terminal 106, 206, 306 Second Terminal 151 First mounting part 152, 252 First connecting part 161 Second mounting part 162, 262 Second connecting part 152A First melting auxiliary piece 162A Second melting auxiliary piece

Claims (10)

A first conductor portion having a first welded portion; a second conductor portion having a second welded portion; and a conductor. The first welded portion and one end of the conductor are welded to each other. An electronic component manufacturing method for manufacturing an electronic component in which a welded portion and the other end of the conductive wire are welded,
One arc current supply device having a first electrode and a second electrode, a first torch electrically connected to the first electrode, and a second torch electrically connected to the second electrode The first torch of the arc welding apparatus comprising: the first torch is opposed to the first welded portion disposed in the vicinity of one end portion of the conducting wire or one end portion of the conducting wire, and the second torch is fitted to one end of the conducting wire. Facing the other end of the conductor conducting to the part or the first welded part, or conducting close to one end of the conductor or the first welded part and adjacent to the other end of the conducting wire A torch facing step to face the second welded portion;
Arcing from the first torch to one end of the conducting wire or the first welded portion simultaneously with the other end of the conducting wire conducting to one end of the conducting wire or the first welded portion Arc discharge from the second torch or arc discharge from the second torch with respect to the second welded portion conducting to the one end portion of the conductive wire or the first welded portion, and one end portion of the conductive wire A method of manufacturing an electronic component, comprising: an arc discharge step of electrically connecting the second welded portion and the second welded portion at the same time as electrically connecting the first welded portion. Before performing the torch facing step, the first conductor portion and the second conductor portion are provided in a non-conductive state,
In the torch facing step, the first torch is made to face one end of the conducting wire and the second torch is made to face the other end of the conducting wire,
2. The electronic component according to claim 1, wherein in the arc discharge step, arc discharge is performed from the first torch to one end of the conducting wire and simultaneously arc discharge from the second torch to the other end of the conducting wire. Manufacturing method.   3. The method of manufacturing an electronic component according to claim 2, wherein the first welded portion is provided with a first melting auxiliary piece protruding from the first welded portion along the conductor. 4.   4. The method of manufacturing an electronic component according to claim 3, wherein the second welded portion is provided with a second melting auxiliary piece protruding from the second welded portion along the conductor. Before performing the torch facing step, the first conductor portion and the second conductor portion are provided in a conductive state,
In the torch facing step, the first torch is made to face the first welded portion and the second torch is made to face the second welded portion,
In the arc discharge step, arc discharge from the first torch to the first welded portion and simultaneously arc discharge from the second torch to the second welded portion,
2. The method of manufacturing an electronic component according to claim 1, further comprising a step of bringing the first conductor portion and the second conductor portion into a non-conductive state after the arc discharge step. Before performing the torch facing step, the first conductor portion and the second conductor portion are provided in a non-conductive state,
Prior to the arc discharge step, the one end of the conducting wire and the first welded portion are brought into conduction, and the end conductor conduction is conducted to bring the other end of the conducting wire and the second welded portion into conduction. Having a process,
In the torch facing step, the first torch is made to face the first welded portion and the second torch is made to face the second welded portion,
2. The arc discharge process in which arc discharge is performed from the first torch to the first welded portion and simultaneously arc discharge from the second torch to the second welded portion. Manufacturing method for electronic parts.   In the arc discharge process, the assist gas is supplied to a portion where the first welded portion and one end portion of the conducting wire are welded and the vicinity thereof, and the second welded portion and the other end portion of the conducting wire. 7. The method of manufacturing an electronic component according to claim 1, wherein an assist gas is supplied to a portion to be welded to and a vicinity thereof.   In the arc discharge step, by controlling the supply amount of the assist gas in the first torch and the second torch, the melting amount of the first welded part and one end of the conducting wire, the second welded part, The method of manufacturing an electronic component according to claim 7, wherein a melting amount of the other end portion of the conducting wire is controlled. The one end of the conducting wire arranged close to the first welding portion and the first welded portion of the first conductor portion are electrically connected by arc welding and the other end of the conducting wire arranged close to each other and the second conductor portion The second welded portion is electrically connected by arc welding, the first conductor portion and one end portion of the conducting wire are welded, and the second conductor portion and the other end portion of the conducting wire are welded. An arc welding apparatus for manufacturing an electronic component,
One arc current supply device having a first electrode and a second electrode;
A first torch electrically connected to the first electrode and capable of facing one end portion of the conducting wire or facing the first welded portion disposed in the vicinity of the one end portion;
A second torch electrically connected to the second electrode and capable of facing the other end portion of the conducting wire or facing the second welded portion disposed in the vicinity of the other end portion; ,
Arc discharge from the first torch to the first welded part disposed in the vicinity of one end of the conducting wire or near the one end of the conducting wire, and at the same time conducting to one end of the conducting wire or the first welded part The second torch arcs from the second torch to the other end of the conducting wire, or conducts to one end of the conducting wire or the first welded portion and is disposed in proximity to the other end of the conducting wire. Arc discharge from the second torch to the welded part electrically connects one end of the conductor and the first welded part, and at the same time, the other end of the conductor and the second welded part An arc welding apparatus characterized by electrically connecting the two.   A reverse electrode discharge step of melting the workpiece by arc discharge from the torch to the workpiece with a relatively positive potential on the torch and a relatively negative potential on the workpiece; An arc welding method characterized by the above.

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