JP2022109548A - Joint device - Google Patents

Abstract

To provide a joint device for improving a strength of a joint part.SOLUTION: A joint device has a power source part, an upper electrode that is connected to the power source part and applies a pressurization force to first workpiece W1 and second workpiece W2 having cylindrical shapes from the upper side, and a lower side electrode that is connected to the power source part and applies the pressurization force to the first workpiece and the second workpiece from the lower side, in which each of the upper side electrode and the lower side electrode is provided with an upper side member, a lower side member, an opening which makes the upper side member and the lower side member conducted through an approximately middle part of the upper side member and the lower side member, and an insulating member for insulating the upper side member and the lower side member in a part excluding the opening.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present invention relates to a joining device for joining one tubular member to a hole in the other tubular member.

Ring Mash (registered trademark) joining is known for joining metal materials of the same kind or metal materials of different kinds. In ring mash joining, one member to be joined in which a hole is formed and another member to be joined having an outer shape slightly larger than the hole are joined. In joining the two, they are overlapped so that the part to be joined around the hole in one of the parts to be joined overlaps the part to be joined around the periphery of the other part to be joined. Then, by applying current from a welding power source while applying pressure to the overlapped parts, the parts to be joined are solid-phase-bonded to each other.

Also, if the materials to be joined are high-carbon steel or carburized steel, if the above joining is performed, the joint will be quenched, and the toughness of the joint and its vicinity will be reduced. do. As a result, defects such as cracks are likely to occur in the portion where the toughness is lowered. Therefore, in order to improve the toughness of the joint, a tempering current may be applied to the joint for tempering.

In Patent Document 1, a lower electrode that contacts the vicinity of the joining portion of the second work, an upper electrode that can contact the vicinity of the joining portion of the first work that is superimposed on the second work, and between the electrodes during joining. A control device that applies a current for bonding and, after bonding, flows a tempering current to the bonded portion of the two works via the electrodes, and a push-in positioning device that positions the two workpieces in the relative movement direction during bonding and leaks the current for bonding. A bonding method and apparatus is disclosed that includes an electrode and an actuator that moves the indentation positioning electrode to a spaced position during tempering.

JP 2006-175497 A

However, such a bonding apparatus is characterized in that current tends to flow in a region near the power source that supplies current, and current does not easily flow in a region distant from the power source. Therefore, in the technique described in Patent Literature 1, when the tempering current is supplied from the control device, the current flowing through the joint is biased according to the distance from the control device. Therefore, the region of the joint where the current does not easily flow is insufficiently tempered. In this way, if the current flowing through the joint is uneven, the quality of tempering deteriorates, and there is a problem that the strength of the tempered joint becomes uneven.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems, and it is an object of the present invention to provide a joining apparatus capable of improving the strength of the joining portion.

A joining apparatus according to an embodiment includes a power supply unit, an upper electrode connected to the power supply unit and applying pressure from above to a first workpiece and a second workpiece both having a cylindrical shape, and connected to the power supply unit. and a lower electrode for applying pressure to the first workpiece and the second workpiece from below, the upper electrode and the lower electrode being the upper member, the lower member, and the upper member, respectively. and an insulating member for insulating the upper member and the lower member in a portion other than the opening.

According to the present invention, it is possible to provide a joining device that improves the strength of the joining portion.

1 is a cross-sectional view showing a joining device according to a first embodiment; FIG. FIG. 2 is an exploded perspective view of an electrode provided in the joining device shown in FIG. 1; 1. It is sectional drawing explaining the manufacturing method of the electrode with which the joining apparatus shown in FIG. 1 is provided. FIG. 5 is a cross-sectional view showing a joining device according to a second embodiment; 5A and 5B are diagrams showing a modification of a current-carrying core provided in an electrode provided in the joining apparatus shown in FIG. 4; It is a figure explaining the joining apparatus of a comparative example.

Embodiment 1
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments. Also, for clarity of explanation, the following description and drawings are simplified as appropriate. It should be noted that what is shown in the drawing is only a part of the whole, and many other configurations not shown are actually included.

The welding apparatus according to the present embodiment overlaps two workpieces, which are metal objects to be welded, so as to have a predetermined overlap margin, and presses them together while supplying a predetermined amount of current to weld the metal. can be plastically flowed to form a solid phase bonded joint. The joining device according to the present embodiment is, for example, a device capable of performing Ring Mash (registered trademark) joining that forms an annular joint.

The joining apparatus according to the present embodiment includes a power supply unit, an upper electrode connected to the power supply unit and applying pressure from above to a first workpiece and a second workpiece both having a cylindrical shape, and connected to the power supply unit. , and a lower electrode that applies a pressure force to the first workpiece and the second workpiece from below, the upper electrode and the lower electrode being respectively an upper member, a lower member, and an upper member. An opening that electrically connects the upper member and the lower member is provided in a substantially central portion with respect to the lower member, and an insulating member that insulates the upper member and the lower member is provided in a portion other than the opening.

With reference to FIG. 1, the above bonding apparatus will be described in detail. FIG. 1 is a cross-sectional view showing a joining device according to Embodiment 1. FIG. As shown in FIG. 1, the bonding apparatus 1 has a pair of electrodes 2 consisting of an electrode 2a and an electrode 2b, a power supply section, and a control device.

In this embodiment, an example of joining a work W1 as a first work and a work W2 as a second work by resistance welding using the joining apparatus 1 will be described. The workpieces W1 and W2 are made of any of the same kind of metal material or different kinds of metal material. For example, the works W1 and W2 are made of carbon steel, steel whose surface is carburized, ferrous materials such as castings, aluminum, aluminum alloys, or the like. Of these, at least one of the works W1 and W2 is a metal material that has been quenched in advance (for example, steel whose surface is carburized), or a metal material that is quenched by energization during welding (for example, hardening is performed). high carbon steel containing as much carbon as possible).

The workpiece W1 has a cylindrical shape, and in this embodiment, the upper end portion of a substantially cylindrical hollow member is formed as a flange portion Wa that protrudes inward, and penetrates the inside of the flange portion Wa in the vertical direction. It has a hole Wb. The work W2 has a cylindrical shape, and is a substantially cylindrical hollow member in this embodiment.

The outer diameter of the work W2 is slightly larger than the diameter of the hole Wb of the work W1. The inner peripheral end of the flange portion Wa of the work W1 (peripheral edge of the hole Wb) and the outer peripheral end (outer shape portion) of the work W2 are parts to be joined, and are joined together to form a joint. The joint portion may be formed over the entire circumference between the inner peripheral end of the flange portion Wa of the work W1 and the outer peripheral end of the work W2, or may be intermittently formed without being joined partially. .

In addition, in order to facilitate alignment of the works W1 and W2 and push-in at the time of joining, the corner formed by the upper end surface of the work W1 on the side of the joined portion and the inner peripheral surface of the flange portion Wa is chamfered. may be Similarly, the corners formed by the lower end surface of the workpiece W2 on the side of the joined portion and the outer peripheral surface may be chamfered.

The electrode 2 of the joining apparatus 1 for joining the works W1 and W2 consists of an electrode 2b as a lower electrode and an electrode 2a as an upper electrode provided above the electrode. Each of the electrodes 2a and 2b has a substantially columnar shape as a whole.

Here, a detailed configuration of the electrode 2 will be described with reference to FIGS. 2 and 3. FIG. FIG. 2 is an exploded perspective view of an electrode provided in the joining device shown in FIG. 1; 3A to 3C are cross-sectional views for explaining a method of manufacturing electrodes provided in the bonding apparatus shown in FIG. In addition, in this embodiment, since the electrodes 2a and 2b have the same shape and structure, one of the electrodes 2 is shown and demonstrated in FIG.2 and FIG.3.

FIG. 2 shows a mode in which the electrode 2 is cut along the central axis. As shown in FIG. 2 , the electrode 2 has an upper member 3 , a lower member 4 and an insulating member 5 . The upper member 3 and the lower member 4 have substantially cylindrical shapes with the same diameter, and are made of a conductive material such as chromium copper or beryllium copper. The upper member 3 and the lower member 4 are arranged to face each other in the vertical direction with the insulating member 5 interposed therebetween, and have vertically symmetrical shapes.

The insulating member 5 is made of an insulating material such as insulating resin or ceramic-coated steel. As the insulating member 5, an appropriate insulating material may be selected in consideration of workability, heat resistance during welding, and pressure resistance. The insulating member 5 is formed to have the same diameter as that of the upper member 3 and the lower member 4, and an opening 5a penetrating vertically is provided in a substantially central portion of the insulating member 5. As shown in FIG.

The diameter of the opening 5a is preferably smaller than the inner diameter of the contact surface between the electrode 2a and the work W2 and the inner diameter of the contact surface between the electrode 2b and the work W1. For example, in FIG. 1, the diameter of the opening 5a is smaller than the inner diameter of the contact surface between the electrode 2a and the workpiece W2.

As shown in FIG. 3, the upper member 3 and the lower member 4 have a substantially cylindrical convex portion 3a corresponding to the opening portion 5a of the insulating member 5 or a convex portion 3a or a convex portion 3b at substantially central portions of the base end surfaces 3s and 4s facing each other. Each has a portion 4a. When assembling the electrode 2, the upper member 3 and the lower member 4 are arranged coaxially so that the base end surfaces 3s and 4s of the upper member 3 and the lower member 4 face each other with the insulating member 5 interposed therebetween. By fitting the projections 3a and 4a of the upper member 3 and the lower member 4 to the openings 5a of the insulating member 5, the electrode 2 can be manufactured.

Since the conductive material is disposed in the opening 5a of the insulating member 5 by fitting the projections 3a and 4a of the upper member 3 and the lower member 4, the electrode 2 is positioned at the opening 5a. It has a configuration in which the upper member 3 and the lower member 4 are electrically connected. Moreover, the upper member 3 and the lower member 4 are separated by the insulating member 5 in the electrode 2 except for the opening 5a, and the upper member 3 and the lower member 4 are insulated. Therefore, the electrode 2 can form a current path through which currents supplied from the outside are collected at the openings 5a and the collected currents are emitted from the openings 5a.

The bonding apparatus 1 also includes a pressure device that moves the electrodes 2a and 2b toward or away from each other and applies pressure between the electrodes 2a and 2b. The pressurizing device is, for example, a cylinder provided with a vertically movable piston rod. An air cylinder, a hydraulic cylinder, or the like can be used for the cylinder. Such a pressure device may be provided so as to drive at least one of the electrodes 2a and 2b.

For example, a pressurizing device is provided for the electrode 2a via a support member that supports the electrode 2a. Thereby, the electrode 2a is configured to be vertically movable. When joining, the workpiece W1 is placed on the upper end surface of the electrode 2b with the flange portion Wa facing upward. The work W2 is overlaid on the work W1 with a predetermined overlap margin. Thus, the works W1 and W2 are set on the electrode 2b.

The electrode 2a is lowered by being pressed by the pressurizing device, and the lower end surface of the electrode 2a contacts the upper end surface of the work W2. The electrode 2a can apply pressure to the works W1 and W2 from above. On the other hand, while the electrode 2b is fixed to the base, the works W1 and W2 are placed and supported on the upper end surface of the electrode 2b. When the electrode 2b receives pressure from the electrode 2a, the electrode 2b can apply pressure to the works W1 and W2 from below due to the reaction force of the pressure.

The power supply unit is a power supply that supplies a pulsed current to the electrode 2 . The power supply unit includes an AC power supply, a rectifier circuit, a DC power supply circuit, a capacitor, an inverter circuit, a transformer, switch parts, and the like, and is configured to be able to pass a large current in a short period of time.

The control device controls the operation of the joining device 1 . The control device is electrically connected to the pressurizing device and drives and controls the pressurizing device. Further, the control device is electrically connected to the power supply section, and can control whether or not current is supplied to the electrodes 2 and the magnitude of the current to be supplied.

With reference to FIG. 1, a description will be given of a current path during energization in the bonding apparatus 1 configured as described above. In addition, in FIG. 1, the current path P1 is indicated by a black arrow. In addition, in the joining device 1, the upper member 3 of the electrode 2a and the lower member 4 of the electrode 2b are electrically connected to a power source. Furthermore, the electrodes 2a, 2b and the works W1, W2 are arranged coaxially when energized.

First, when a current is supplied from the power source to the upper member 3 of the electrode 2a, the supplied current is collected at the opening 5a of the electrode 2a. After passing through the opening 5a of the electrode 2a, the concentrated current is dispersed radially from the opening 5a of the electrode 2a toward the contact surface between the electrode 2a and the workpiece W2. flowing. The current flowing through the lower member 4 of the electrode 2a flows evenly in the circumferential direction of the work W2 via the contact surface between the electrode 2a and the work W2.

Subsequently, the current flowing through the work W2 flows to the work W1 through the joined portion where the work W2 and the work W1 are in contact with each other. The current flowing through the work W1 flows to the upper member 3 of the electrode 2b via the contact surface between the work W1 and the electrode 2b. The current flowing through the upper member 3 of the electrode 2b is collected at the opening 5a of the electrode 2b. After passing through the opening 5a of the electrode 2b, the concentrated current flows through the lower member 4 of the electrode 2b and reaches the power source. Such a current path P1 is formed in the bonding apparatus 1 according to this embodiment.

Next, a method of joining the works W1 and W2 using the joining apparatus 1 will be described. First, the workpiece W1 is set on the electrode 2b. Further, the work W2 is set on the work W1. At this time, the work W2 is aligned with the work W1 with a predetermined overlap margin.

Subsequently, the electrode 2a is lowered by driving the cylinder of the pressure device. The lowered electrode 2a abuts on the work W2 and applies pressure to the works W1 and W2 while sandwiching the works W1 and W2 between the pair of electrodes 2, thereby applying pressure to the works W1 and W2 from above and below.

Then, while applying pressure to the works W1 and W2, a current for welding is supplied from the power source. The joining current flows through the parts to be joined along the current path P1, heat is generated by the contact resistance between the parts to be joined, and the parts to be joined undergo plastic flow. The work W2 is pushed into the hole Wb of the work W1 as the plastic flow progresses in the part to be joined, forming a joint between the inner peripheral end of the flange portion Wa of the work W1 and the outer peripheral end of the work W2. do. After the joining current is supplied, the supply of electricity to the electrode 2a is stopped, and the works W1 and W2 are cooled.

According to the above-described joining method, the works W1 and W2 are arranged with a slight overlapping margin, and are sandwiched between a pair of electrodes 2 (electrode 2a and electrode 2b) and a large current is applied while applying pressure. Instantaneous solid phase bonding is possible at temperatures below the melting point. Therefore, according to the above joining method, thermal strain is small and welding can be performed in a short time.

In this embodiment, at least one of the workpieces W1 and W2 is made of a metal material that has been quenched in advance, or a metal material that is quenched by energization during welding. Therefore, the joint is in a quenched state.

Therefore, the joint is tempered in order to improve the toughness of the joint. Subsequent to the formation of the joints described above, when a current for tempering is supplied from the power source while applying pressure to the works W1 and W2, the current for tempering flows to the joints along the current path P1. As a result, the joint is tempered. When the tempering of the joint is completed, the pressure and the current applied to the electrode 2a are released, and the electrode 2a rises back to its initial position. Then, the works W1 and W2 that have been joined together are taken out from the joining apparatus 1 .

Next, with reference to FIG. 6, a current path during energization in the bonding apparatus of the comparative example will be described. FIG. 6 is a diagram illustrating a bonding apparatus of a comparative example. A bonding apparatus 100 of a comparative example shown in FIG. 6 has the same configuration as the bonding apparatus 1 except that the electrodes are made of only a conductive material. Therefore, in the drawings, the same or corresponding configurations are denoted by the same reference numerals, and descriptions thereof are omitted.

The pair of electrodes 102 included in the bonding apparatus 100 consists of an electrode 102b and an electrode 102a provided above the electrode 102b. Each electrode 102a, 102b has a substantially cylindrical shape. Electrodes 102a and 102b are made of a conductive material such as chromium copper or beryllium copper. Unlike the electrodes 2a and 2b, the electrodes 102a and 102b do not have the insulating member 5, so the current path within the electrode 102 is not controlled. Also, the electrodes 102a and 102b are electrically connected to the power source section 200, respectively. The power supply unit 200 is electrically connected to a control device 300 that controls the operation of the bonding device 100 .

By the way, the longer the distance from the supply source, the greater the electrical resistance of the current, making it more difficult for the current to flow. Therefore, in the bonding device 100 in which the current path within the electrode 102 is not controlled, current tends to flow mainly along the current path P2. In this case, current tends to flow in the region of the power supply unit 200 side of the works W1 and W2, which have a short energizing distance from the power supply unit 200, which is the current supply source, and the power supply of the works W1 and W2 having a long energizing distance from the power supply unit 200. It is difficult for current to flow in a region away from the portion 200 .

As described above, when the current path is not controlled, the current flows biased toward the power supply unit 200 with respect to the works W1 and W2 according to the distance from the power supply unit 200 . That is, when the tempering current is applied to the joint between the workpieces W1 and W2 using the joining apparatus 100, the joint is locally tempered in a region near the power supply unit 200. FIG. On the other hand, since tempering is not sufficiently performed in a region of the joint away from the power supply unit 200, the toughness in this region remains low, and defects such as cracks are still likely to occur. Therefore, when the joining apparatus 100 is used, there is a problem that the current flowing through the joint is uneven, and the strength of the tempered joint becomes uneven.

On the other hand, the joining apparatus 1 according to the first embodiment includes electrodes 2 in which an insulating member 5 is interposed between an upper member 3 and a lower member 4 each made of a conductive material. , W2 from above and below. The insulating member 5 is provided with an opening 5a in a substantially central portion, and the electrode 2 is configured such that the upper member 3 and the lower member 4 are electrically connected through the opening 5a.

According to the joining device 1 having such an electrode 2, the current path can be controlled by concentrating the current flowing through the electrode 2 into the opening 5a. In the joining apparatus 1, the electrode 2 and the works W1 and W2 are arranged coaxially when current is applied for joining and tempering. Therefore, the current collected at the opening 5a of the electrode 2a, which is the current supply side, flows radially from above the work W2 along the central axis of the work W2 toward the work W2 in a dispersed manner. After that, the current passing through the parts to be joined of the works W1 and W2 is concentrated in the opening 5a of the electrode 2b arranged along the central axis of the work W1 below the work W1.

At this time, the contact surfaces between the electrodes 2a and 2b and the works W1 and W2 are formed in an annular shape around the opening 5a of the electrode 2a and the opening 5a of the electrode 2b. Therefore, the current emitted from the opening 5a of the electrode 2a passes through the same radial distance until it reaches the contact surface between the electrode 2a and the workpiece W2, and flows substantially uniformly over the entire circumference of the contact surface. In addition, the current flowing through the works W1 and W2 converges at the opening 5a of the electrode 2b through the same radial distance from the contact surface between the work W1 and the electrode 2b to the opening 5a of the electrode 2b.

That is, the current flowing through the junction is symmetrical about the central axis from the opening 5a of the electrode 2a where the current is emitted, passes through the junction and reaches the opening 5a of the electrode 2b where the current converges. A current path P1 having a property is formed. Also, the current path P1 is formed over the entire circumference around both openings 5a.

As a result, if the welding apparatus 1 according to the first embodiment is used, the current flowing through the joint where the works W1 and W2 are joined travels the same conducting distance from the opening 5a of the electrode 2a to the joint, The current density is almost uniform over the entire circumference of the junction. Therefore, the non-uniform current flowing through the joints, which occurs when the jointing apparatus 100 of the comparative example is used, is eliminated. Therefore, even when the tempering current is applied, the temperature rises uniformly around the entire circumference of the joint, and the joint after tempering is fully tempered as a whole. In other words, in the joints that have been joined and tempered by the joining apparatus according to the first embodiment, the overall toughness is improved, and good and uniform strength can be obtained.

Embodiment 2
A joining apparatus according to a second embodiment will be described with reference to FIGS. 4 and 5. FIG. FIG. 4 is a cross-sectional view showing a joining device according to a second embodiment; FIG. 5 is a diagram showing a modification of the current-carrying core provided in the electrode provided in the joining apparatus shown in FIG.

The joining device 10 shown in FIG. 4 has the same configuration as that of the first embodiment except that the electrodes 12 are provided with the current-carrying cores 16 . Therefore, the electrode 12, which is different from the bonding apparatus 1, will be described. In the drawings, the same or corresponding configurations are denoted by the same reference numerals, and descriptions thereof are omitted.

The electrode 12 of the bonding device 10 is composed of an electrode 12b as a lower electrode and an electrode 12a as an upper electrode provided above the electrode 12b. Each of the electrodes 12a and 12b has a substantially columnar shape as a whole.

The electrode 12 has an upper member 13 , a lower member 14 , an insulating member 15 and a conducting core 16 . The upper member 13 and the lower member 14 have substantially cylindrical shapes with the same diameter, and are made of a conductive material such as chromium copper or beryllium copper. The upper member 13 and the lower member 14 are arranged to face each other in the vertical direction with the insulating member 15 interposed therebetween.

A substantially central portion of the upper member 13 is provided with a concave portion 13a that opens at a base end surface 13s of the upper member 13 . The concave portion 13 a has a shape that tapers downward toward the insulating member 15 . A substantially central portion of the lower member 14 is provided with a concave portion 14a that opens at a base end surface 14s of the lower member 14 . The concave portion 14 a has a shape that tapers upward toward the insulating member 15 . The concave portion 13a and the concave portion 14a have vertically symmetrical shapes with the insulating member 15 interposed therebetween.

The insulating member 15 is made of an insulating material such as insulating resin or ceramic-coated steel. An appropriate insulating material may be selected for the insulating member 15 in consideration of workability, heat resistance during welding, and pressure resistance. An opening 15 a is provided in the substantially central portion of the insulating member 15 so as to penetrate vertically.

The diameter of the opening 15a is preferably smaller than the inner diameter of the contact surface between the electrode 12a and the work W2 and the inner diameter of the contact surface between the electrode 12b and the work W1. For example, in FIG. 4, the diameter of the opening 15a is smaller than the inner diameter of the contact surface between the electrode 12a and the workpiece W2. Furthermore, the diameter of the opening 15a is the same as the diameter of the opening formed by the recesses 13a and 14a at substantially central portions of the base end surfaces 13s and 14s.

In the electrode 12, the upper member 13 and the lower member 14 are coaxially arranged with the insulating member 15 interposed therebetween so that the base end surfaces 13s and 14s of the upper member 13 and the lower member 14 face each other. The recess 13a, the opening 15a, and the recess 14a are coaxially connected to form the conducting core 16. As shown in FIG. Further, the opening 15a communicates the recess 13a and the recess 14a.

The conductive core 16 formed in this way extends in the vertical direction along the central axis inside the electrode 12 and has a substantially hourglass shape that is constricted in the radial direction at the opening 15 a of the insulating member 15 . In addition, the cross-section of the conductive core 16 cut along the radial direction has a shape in which the cross-sectional area gradually increases as the distance from the opening 15a increases in the vertical direction.

Moreover, as shown in FIG. 5, the conductive core 16 may have a substantially cylindrical shape extending vertically along the central axis of the electrode 12 . In this case, approximately cylindrical recesses 13b and 14b are formed in approximately central portions of the upper member 13 and the lower member 14 and have the same diameter as the opening 15a and extend vertically along the central axis. is provided. The recess 13b opens at the base end surface 13s of the upper member 13, and the recess 14b opens at the base end surface 14s of the lower member .

By providing the conductive core 16 in the electrode 12, a current path P1 is formed by controlling the current path from the opening 15a of one electrode 12a to the opening 15a of the other electrode 12b in the same manner as in the first embodiment. can be done. Further, the current-carrying core extending along the central axis including the opening 15a has a function of inducing current to flow toward the opening 15a. Therefore, according to the joining apparatus 10 according to the second embodiment, the same effects as those described in the first embodiment can be obtained, and the currents in the electrodes can be collected more efficiently.

It should be noted that the present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the scope of the invention. For example, the upper and lower members of the electrode may have vertically asymmetric shapes as long as they do not interfere with current concentration at the opening, and each embodiment may be applied in combination.

1, 10, 100 joining devices 2, 12, 102 electrodes 2a, 12a, 102a electrodes 2b, 12b, 102b electrodes 3, 13 upper members 3a, 4a convex portions 3s, 4s, 13s, 14s base end surfaces 4, 14 lower members 5, 15 Insulating members 5a, 15a Openings 13a, 13b, 14a, 14b Recess 16 Conductive core 200 Power supply unit 300 Controllers P1, P2 Current paths W1, W2 Work Wa Flange Wb Hole

Claims (1)

a power supply;
an upper electrode that is connected to the power supply unit and applies pressure from above to the first work and the second work, both of which have a cylindrical shape;
a lower electrode that is connected to the power supply unit and applies pressure to the first work and the second work from below;
The upper electrode and the lower electrode, respectively,
an upper member;
a lower member;
An opening for conducting the upper member and the lower member is provided in a substantially central portion between the upper member and the lower member, and the upper member and the lower member are separated from each other in a portion other than the opening. an insulating member that insulates;
A splicing device having a

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