CN116408527A - Power supply device for thermoplastic composite material resistance welding and resistance welding machine - Google Patents

Abstract

The invention discloses a power supply device for resistance welding of a thermoplastic composite material and a resistance welding machine, and belongs to thermoplastic composite material processing equipment. The power supply device comprises a power supply plate and a joint assembly; the power supply plate comprises a negative electrode plate and a positive electrode plate, and the negative electrode plate and the positive electrode plate are separated by an insulating plate; the connector assembly comprises a plug and a socket; one end of the socket is connected with the plug, and the other end of the socket is fixed on the positive electrode plate of the power supply plate; the plug is provided with an output contact for output, and the plug is internally provided with an anode contact and a cathode contact; when the plug is inserted into the socket, the positive electrode contact can be contacted with the output contact, so that the plug is communicated with the positive electrode plate; when the plug is separated from the socket, the negative electrode contact can be communicated with the output contact, so that the plug is communicated with the negative electrode plate. The invention can improve the safety performance of the thermoplastic composite material resistance welding, reduce the electric shock risk and has simple and convenient operation.

Description

Power supply device and resistance welding machine for resistance welding of thermoplastic composite materials

technical field

The invention relates to thermoplastic composite material processing equipment, in particular to a power supply device and a resistance welder for thermoplastic composite material resistance welding.

Background technique

Thermoplastic composites have attracted extensive attention due to their high damage tolerance, high reusability, and ease of molding. For composite materials, the most common joining methods are mechanical joining and adhesive joining. However, the use of mechanical connections will inevitably increase the structural weight and cause stress concentration problems. The use of adhesive connection requires higher surface treatment and longer production cycle. Resistance welding has the advantages of concentrated welding heat, short heating time, less welding deformation and stress, high production efficiency and simple operation. Therefore, resistance welding is more and more widely used in the connection of thermoplastic composite materials.

Existing resistance welding equipment has high power and high degree of mechanization and automation, but the equipment cost is high and maintenance is difficult. Commonly used high-power single-phase AC welding machines are not suitable for welding composite materials. For composite materials, resin-based materials have small thermal conductivity, long time for temperature change required for welding, large difference in welding pressure level due to viscous flow of resin when the temperature rises, and reinforcement materials are staggered with resin flow during welding, etc. characteristics, will affect the welding quality, making the current relatively mature metal material resistance welding experience system less applicable in the field of composite material welding. If it is perfect, a large number of experiments need to be carried out in the range of higher deformation, long-term low temperature, and low pressure to build a widely applicable composite material welding knowledge system. The existing resistance welding equipment for metal materials was originally designed for the welding conditions of instantaneous high temperature and high pressure. In the welding process of composite materials, the applicability of this type of equipment is low. electrical safety hazard.

Therefore, how to design a set of high-safety power supply equipment specifically for thermoplastic composite welding and to fill the gaps in related fields is very important.

Contents of the invention

In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a power supply device and a resistance welding machine for resistance welding of thermoplastic composite materials, which can realize resistance welding connection of thermoplastic composite materials, and have high safety performance and simple and convenient operation .

In order to solve the above technical problems, the present invention adopts the following technical solutions:

A power supply device for resistance welding of thermoplastic composite materials, including a power supply board and a joint assembly; the power supply board includes a negative electrode sheet and a positive electrode sheet, and an insulating sheet is used to separate the negative electrode sheet and the positive electrode sheet; the joint assembly It includes a plug and a socket; one end of the socket is connected to the plug, and the other end is fixed on the positive electrode sheet of the power supply board; the plug is provided with an output contact for output, and a positive contact and a negative pole are also provided inside the plug contact; when the plug is inserted into the socket, the positive contact can be in contact with the output contact, so that the plug communicates with the positive electrode sheet; when the plug is separated from the socket, the negative contact can be connected with the output contact, so that The plug communicates with the negative electrode sheet.

In this way, by setting the power supply device as a positive electrode-insulation layer-negative electrode stacked power transmission system, the risk of electric shock caused by the use of wire harnesses for power supply in the existing power supply device is avoided, the space for wiring inside the power supply board is saved, and the power supply device is more concise. By setting a joint assembly including a plug and a socket, the plug is provided with an output contact for output, and a positive contact and a negative contact are also provided inside the plug, and the socket is fixed on the positive electrode sheet, so that when When the plug is inserted into the socket, the positive contact inside the plug communicates with the output contact. At this time, the joint assembly is connected to the positive electrode sheet, and the joint assembly acts as the positive pole of the connection circuit. Conversely, when the plug is separated from the socket, the negative contact inside the plug It communicates with the output contact, at this time, the joint component is connected with the negative electrode sheet, and the joint component acts as the negative pole of the connection circuit. Other modules (or components) in resistance welding can form a circuit by connecting the joint components connected to the positive pole of the circuit and the joint components connected to the negative pole respectively, and the joint components connected to the positive pole of the circuit and the joint components connected to the negative pole are other components in resistance welding. Modules (or components) provide positive and negative power outputs. The functional integration of the module installation positioning hole, the positive circuit output hole and the negative circuit output hole is realized.

Preferably, through holes distributed in a rectangular array are correspondingly opened on the negative electrode sheet, the insulating sheet and the positive electrode sheet, and the socket is fixed in the through hole of the positive electrode sheet of the power supply board. The through-holes distributed in a rectangular array on the negative electrode sheet, insulating sheet and positive electrode sheet are arranged neatly, which can provide sites for the positioning and quick installation of other modules during the resistance welding process of thermoplastic composite materials, making installation and positioning more convenient and realizing modularization Quick installation.

Preferably, the power supply board further includes a positioning plate located above the negative electrode sheet and a lower cover plate located below the positive electrode sheet, and the positioning plate and the lower cover plate are correspondingly opened with through holes distributed in a rectangular array. In this way, the location of the power supply device is easier and safer.

Preferably, the plug includes a shell and a conductive rod; the shell is a cylindrical structure with one end closed, and the other end is connected with a ring-shaped negative terminal; the outside of the negative terminal extends to the outside of the shell and its outer diameter It is larger than the diameter of the through hole on the negative electrode sheet; an output ring extending to the inside of the housing is provided on the housing, and the inner side of the output ring forms an output contact; one end of the conductive rod is connected with a handle, and the other end passes through the housing After being connected with the negative pole connector, it is connected with a positive pole joint; a negative pole ring is set on the conductive rod, and the outer side of the negative pole ring extends toward the direction of the output ring to form a negative pole contact; A conductive spring is provided, one end of the conductive spring is connected to the negative electrode ring, and the other end is connected to the negative electrode connector; a positive rod is also provided on the insertion rod along its radial direction, and the positive rod is located on the side of the negative electrode ring away from the conductive spring. The outer side of the positive rod extends toward the direction of the output ring to form a positive contact; the conductive rod is separated from the negative connector, the negative ring and the conductive spring by insulating material; when the conductive rod moves along the axial direction of the housing, the The negative pole contact and the positive pole contact can respectively contact and communicate with the output contact.

By setting the output ring for output on the casing, setting the positive rod and the negative electrode ring in the casing, and setting the conductive spring between the negative electrode ring and the negative electrode connector, so that the socket is fixed behind the through hole on the power supply board , when the plug is inserted, the negative electrode connector abuts and communicates with the through hole on the negative electrode sheet because its outer diameter is larger than the shell. At this time, the conductive spring is in a natural state. Under the action of the conductive spring, the negative contact of the negative pole ring is in contact with the output contact of the output ring. The negative electrode sheet is conducted through the conductive spring, the negative electrode ring and the output ring, so that the socket acts as a negative electrode. When the conductive rod is pressed down to insert the positive connector into the socket, since the negative ring connected to the positive rod also moves downward, the negative contact of the negative ring is disconnected from the output contact of the output ring. At this time, the positive pole of the positive rod The contacts are in contact with the output contacts of the output ring, and the positive electrode sheet is connected to the output ring through the positive connector, the conductive rod and the positive electrode sheet, so that the socket acts as a positive electrode. On the contrary, when the plug is switched from the positive electrode to the negative electrode, the conductive rod is lifted up by the handle to separate the positive connector from the socket, the conductive spring changes from the compressed state to the natural state, and the conductive spring stretches upward to drive the negative electrode ring It rises, thereby driving the conductive rod fixed with it to rise, so that the positive contact is disconnected from the output contact, and the negative contact is in contact with the output contact.

Preferably, the conductive rod, the output ring, the positive pole, the negative pole ring and the negative pole connector are all made of conductive materials, so that the current can be conducted and the reliability of the device is increased.

Preferably, the positive rod is made of elastic conductive material. In this way, when the positive terminal is connected to the positive electrode sheet, the positive contact of the positive rod can interact with the output contact of the output ring to play a limiting role, so that the conductive rod is fixed at this position.

Preferably, the socket includes a limiter and a positive pin; the limiter is provided with a limit bayonet matched with the positive connector; the positive pin protrudes in a direction away from the limiter and can be connected with The through hole on the positive electrode sheet is clipped and fixed to increase the reliability of the whole device.

Preferably, the casing is an insulating casing, and the handle is an insulating handle, so that the safety of electricity usage is improved and the risk of electricity usage is reduced.

The present invention also provides a resistance welding machine for resistance welding of thermoplastic composite materials. The resistance welding machine adopts the power supply device for resistance welding of thermoplastic composite materials for power supply.

In this way, during the resistance welding process of thermoplastic composite material resistance welding, it is convenient to take power, the operation is simple, and there is no danger of power consumption caused by exposed lines, which greatly improves the safety performance in the resistance welding operation. Moreover, through the regularly distributed through holes on the power supply board for positioning, the modular and quick installation design of the power supply board is realized, and the functional integration of the module installation positioning hole, the positive circuit output hole and the negative circuit output hole is realized.

Compared with prior art, the present invention has following advantage:

In this way, by setting the power supply device as a positive electrode-insulation layer-negative electrode stacked power transmission system, the risk of electric shock caused by the use of wire harnesses for power supply in the existing power supply device is avoided, the space for wiring inside the power supply board is saved, and the power supply device is more concise. By setting a joint assembly including a plug and a socket, the plug is provided with an output contact for output, and a positive contact and a negative contact are also provided inside the plug, and the socket is fixed on the positive electrode sheet, so that when When the plug is inserted into the socket, the positive contact inside the plug communicates with the output contact. At this time, the joint assembly is connected to the positive electrode sheet, and the joint assembly acts as the positive pole of the connection circuit. Conversely, when the plug is separated from the socket, the negative contact inside the plug It communicates with the output contact, at this time, the joint component is connected with the negative electrode sheet, and the joint component acts as the negative pole of the connection circuit. Other modules (or components) in resistance welding can form a circuit by connecting the joint components connected to the positive pole of the circuit and the joint components connected to the negative pole respectively, and the joint components connected to the positive pole of the circuit and the joint components connected to the negative pole are other components in resistance welding. Modules (or components) provide positive and negative power outputs. The functional integration of the module installation positioning hole, the positive circuit output hole and the negative circuit output hole is realized.

Description of drawings

Fig. 1 is a schematic diagram of a power supply device for resistance welding of thermoplastic composite materials according to the present invention.

Fig. 2 is a schematic diagram of a power supply board in a power supply device for resistance welding of thermoplastic composite materials according to the present invention.

Fig. 3 is a schematic diagram of a joint assembly in a power supply device for resistance welding of thermoplastic composite materials according to the present invention.

Fig. 4 is a cross-sectional view of the separation of the plug and the socket in the present invention.

Fig. 5 is a sectional view of the connection between the plug and the socket in the present invention.

Fig. 6 is a cross-sectional view of a plug connected to a negative electrode sheet in a power supply device for resistance welding of thermoplastic composite materials according to the present invention.

Fig. 7 is a cross-sectional view of a plug connected to a positive electrode sheet in a power supply device for resistance welding of thermoplastic composite materials according to the present invention.

In the figure: power supply board 10, negative electrode sheet 11, positive electrode sheet 12, insulating sheet 13, positioning plate 14, lower cover plate 15, plug 20, output ring 21, positive rod 22, negative electrode ring 23, housing 24, conductive Rod 25, negative terminal 26, positive terminal 27, insulating washer 28, conductive spring 29, socket 30, limiter 31, positive pin 32.

Detailed ways

The embodiment of the present invention discloses a power supply device for resistance welding of thermoplastic composite materials. Referring to FIG. 1 , the power supply device includes a power supply board 10 and a joint assembly. Referring to FIG. 2 , the power supply board 10 includes a negative electrode sheet 11 and a positive electrode sheet 12 , and the negative electrode sheet 11 and the positive electrode sheet 12 are separated by an insulating sheet 13 . The connector assembly includes a plug 20 and a socket 30 . Referring to FIG. 3 , one end of the socket 30 is connected to the plug 20 , and the other end is fixed on the positive electrode sheet 12 of the power supply board 10 . The plug 20 is provided with an output contact for output, and a positive contact and a negative contact are also provided inside the plug 20 . When the plug 20 is inserted into the socket 30 , the positive contact can contact the output contact, so that the plug 20 communicates with the positive electrode piece 12 . When the plug 20 is separated from the socket 30 , the negative contact can communicate with the output contact, so that the plug 20 communicates with the negative electrode piece 11 .

During specific implementation, referring to FIG. 2 again, the negative electrode sheet 11, the insulating sheet 13 and the positive electrode sheet 12 of the power supply board 10 are correspondingly provided with through holes distributed in a rectangular array, and the socket 30 is fixed on the positive electrode sheet 10 of the power supply board 10. In the through hole of the electrode sheet 12. During implementation, since the negative electrode sheet 11 has a certain thickness, a slot along the axial direction of the through hole is provided in the through hole of the negative electrode sheet 11 to increase the deformability of the negative electrode sheet 11 . Preferably, a cutting groove is provided every 90° on the through hole wall of the negative electrode sheet 11 . In this way, it is convenient to insert the negative electrode tab 26 into the through hole of the negative electrode sheet 11 . More preferably, an annular protrusion is provided on the inner wall of the through hole of the negative electrode sheet 11 , and the clamping of the negative electrode joint 26 is more stable in cooperation with the deformation of the through hole. By opening the through holes arranged in a rectangular array on the negative electrode sheet 11, the insulating sheet 13 and the positive electrode sheet 12, it is possible to provide sites for the positioning and rapid installation of other modules during the resistance welding process of thermoplastic composite materials, making the installation and positioning easier. It is convenient and realizes the rapid installation of modularization. As a preference, the power supply board 10 also includes a positioning plate 14 located above the negative electrode sheet 11 and a lower cover plate 15 located below the positive electrode sheet 12, and the positioning plate 14 and the lower cover plate 15 are also correspondingly opened in a rectangular array. Distributed vias. In this way, the location of the power supply device is easier and safer.

For specific implementation, referring to FIG. 4 and FIG. 5 , the plug 20 includes a housing 24 and a conductive rod 25 . The casing 24 is a cylindrical structure with one end closed, and the other end is connected with an annular negative electrode connector 26 . The outside of the negative electrode joint 26 extends to the outside of the casing 24 and its outer diameter is greater than the diameter of the through hole on the negative electrode sheet 11, so that when the negative electrode joint 26 is inserted, the negative electrode sheet 11 will be forced to deform, thereby clamping the negative electrode Connector 26 , so that the negative electrode connector 26 can be in contact with the negative electrode sheet 11 and conducted when the plug 20 is inserted into the through hole.

An output ring 21 extending to the inside of the housing 24 is provided on the housing 24 , and the inner side of the output ring 21 forms an output contact. One end of the conductive rod 25 is connected with a handle, and the other end is connected to a positive terminal 27 after passing through the casing 24 and the negative terminal 26 . A negative electrode ring 23 is sheathed on the conductive rod 25 , and the outer side of the negative electrode ring 23 extends toward the output ring 21 to form a negative electrode contact. During specific implementation, the negative electrode ring 23 is fastened on the conductive rod 25 . A conductive spring 29 is sheathed on the conductive rod 25 between the negative electrode ring 23 and the negative electrode connector 26 . One end of the conductive spring 29 is connected to the negative electrode ring 23 , and the other end is connected to the negative electrode connector 26 . A positive rod 22 is also arranged on the inserting rod along its radial direction. The positive rod 22 is located on the side of the negative ring 23 away from the conductive spring 29 . The outer side of the positive rod 22 extends toward the output ring 21 to form a positive contact. During specific implementation, the positive rod 22 is made of elastic conductive material. In this way, when the positive terminal 27 is connected to the positive electrode sheet 12, the positive contact of the positive rod 22 can interact with the output contact of the output ring 21 to limit the position, so that the conductive rod 25 is fixed at this position. The conductive rod 25 is separated from the negative electrode connector 26 , the negative electrode ring 23 and the conductive spring 29 by insulating materials. As preferably, an insulating washer 28 is arranged between the conductive rod 25 and the negative pole joint 26, the electric pole and the negative pole ring 23, and the conductive rod 25 and the conductive spring 29 to ensure that the conductive rod 25 and the negative pole joint 26, the negative pole ring 23 and the conductive spring 29 are insulated, which improves the safety performance of the device. When the conductive rod 25 moves along the axial direction of the housing 24, the negative contact and the positive contact can respectively contact and communicate with the output contacts.

Specifically, referring to FIG. 6 , after fixing the socket 30 to the through hole on the power supply board 10 , when the plug 20 is inserted, the negative terminal 26 abuts against the through hole on the negative electrode piece 11 because its outer diameter is larger than that of the housing 24 and connected. At this time, the conductive spring 29 is in a natural state. Under the action of the conductive spring 29, the negative contact of the negative pole ring 23 is in contact with the output contact of the output ring 21. The positive terminal 27 has not yet reached the socket 30 and is in a separated state with the socket 30. The negative electrode sheet 11 conducts with the output ring 21 through the conductive spring 29, the negative electrode ring 23, so that the socket 30 acts as a negative electrode. Referring to Fig. 7, when the conductive rod 25 is pressed down to insert the positive connector 27 into the socket 30, since the negative ring 23 connected with the positive rod also moves downward, the negative contact of the negative ring 23 and the output contact of the output ring 21 disconnected, at this time, the positive contact of the positive pole 22 is in contact with the output contact of the output ring 21, and the positive electrode piece 12 is connected to the output ring 21 through the positive joint 27, the conductive rod 25 and the positive pole piece, so that the socket 30 behaves for the positive electrode. On the contrary, when the plug 20 is switched from the positive electrode to the negative electrode, the conductive rod 25 is lifted by the handle to separate the positive terminal 27 from the socket 30, and the conductive spring 29 changes from a compressed state to a natural state, and the conductive spring 29 The upward extension drives the negative pole ring 23 to rise, thereby driving the conductive rod 25 fixed thereto to rise, so that the positive pole contact is disconnected from the output contact, and the negative pole contact is in contact with the output contact.

As a preference, the conductive rod 25, the output ring 21, the positive rod 22, the negative ring 23 and the negative connector 26 are all made of conductive materials, so that the current can be conducted and the reliability of the device is increased. The casing 24 is an insulating casing 24, and the handle is an insulating handle, so that the safety of electricity usage is improved and the risk of electricity usage is reduced.

During specific implementation, the socket 30 includes a limiter 31 and a positive pin 32 . The limiter 31 is provided with a limit bayonet matched with the positive terminal 27 . The positive pin 32 protrudes away from the limiter 31 and can be engaged with the through hole on the positive electrode sheet 12 to increase the reliability of the whole device.

By setting the power supply device as a positive electrode-insulation layer-negative electrode stacked power transmission system, the risk of electric shock caused by the use of wire harnesses for power supply in the existing power supply device is avoided, and the internal wiring space of the power supply board is saved, making the power supply device more concise. By setting a joint assembly including a plug and a socket, the plug is provided with an output contact for output, and a positive contact and a negative contact are also provided inside the plug, and the socket is fixed on the positive electrode sheet, so that when When the plug is inserted into the socket, the positive contact inside the plug communicates with the output contact. At this time, the joint assembly is connected to the positive electrode sheet, and the joint assembly acts as the positive pole of the connection circuit. Conversely, when the plug is separated from the socket, the negative contact inside the plug It communicates with the output contact, at this time, the joint component is connected with the negative electrode sheet, and the joint component acts as the negative pole of the connection circuit. Other modules (or components) in resistance welding can form a circuit by connecting the joint components connected to the positive pole of the circuit and the joint components connected to the negative pole respectively, and the joint components connected to the positive pole of the circuit and the joint components connected to the negative pole are other components in resistance welding. Modules (or components) provide positive and negative power outputs. The functional integration of the module installation positioning hole, the positive circuit output hole and the negative circuit output hole is realized.

Since the above-mentioned power supply device is used to supply power to the thermoplastic composite material resistance welding machine, it is convenient to take power during the resistance welding process, and the operation is simple, and there is no danger of power consumption caused by exposed lines, which greatly improves the safety performance in the resistance welding operation . at the same time. The positioning is carried out through the regularly distributed through holes on the power supply board, which realizes the modularized rapid installation and positioning of the power supply board, saves positioning time and improves efficiency.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (9)

1. A power supply device for resistance welding of thermoplastic composite materials, which is characterized by comprising a power supply plate and a joint assembly; the power supply plate comprises a negative electrode plate and a positive electrode plate, and the negative electrode plate and the positive electrode plate are separated by an insulating plate; the connector assembly comprises a plug and a socket; one end of the socket is connected with the plug, and the other end of the socket is fixed on the positive electrode plate of the power supply plate; the plug is provided with an output contact for output, and the plug is internally provided with an anode contact and a cathode contact; when the plug is inserted into the socket, the positive electrode contact can be contacted with the output contact, so that the plug is communicated with the positive electrode plate; when the plug is separated from the socket, the negative electrode contact can be communicated with the output contact, so that the plug is communicated with the negative electrode plate.

2. The power supply device for thermoplastic composite material resistance welding according to claim 1, wherein through holes distributed in a rectangular array are correspondingly formed in the negative electrode sheet, the insulating sheet and the positive electrode sheet, and the socket is fixed in the through hole of the positive electrode sheet of the power supply board.

3. The power supply device for resistance welding of thermoplastic composite materials according to claim 2, wherein the power supply plate further comprises a positioning plate positioned above the negative electrode plate and a lower cover plate positioned below the positive electrode plate, and through holes distributed in a rectangular array are correspondingly formed in the positioning plate and the lower cover plate.

4. The power supply for thermoplastic composite material resistance welding of claim 1, wherein the plug comprises a housing and a conductive rod; the shell is of a cylindrical structure with one end closed, and the other end is connected with an annular negative electrode joint; the outer side of the negative electrode joint extends to the outer side of the shell, and the outer diameter of the negative electrode joint is larger than the diameter of the through hole on the negative electrode plate; an output ring extending to the inside of the shell is arranged on the shell, and an output contact is formed on the inner side of the output ring; one end of the conducting rod is connected with a handle, and the other end of the conducting rod penetrates through the shell and the negative electrode connector and then is connected with a positive electrode connector; a negative electrode ring is sleeved on the conducting rod, and the outer side of the negative electrode ring extends towards the direction of the output ring to form a negative electrode contact; a conductive spring is sleeved on the conductive rod between the negative electrode ring and the negative electrode joint, one end of the conductive spring is connected with the negative electrode ring, and the other end of the conductive spring is connected with the negative electrode joint; the plunger is also provided with a positive pole rod along the radial direction of the plunger, the positive pole rod is positioned at one side of the negative pole ring, which is away from the conductive spring, and the outer side of the positive pole rod extends towards the direction of the output ring to form a positive pole contact; the conducting rod is separated from the negative electrode joint, the negative electrode ring and the conducting spring by insulating materials; the negative contact and the positive contact are capable of contacting and communicating with the output contact, respectively, when the conductive rod moves in the axial direction of the housing.

5. The power supply device for resistance welding of thermoplastic composite materials according to claim 4, wherein the conductive rod, the output ring, the positive electrode rod, the negative electrode ring and the negative electrode joint are all made of conductive materials.

6. The power supply device for resistance welding of thermoplastic composite material according to claim 4, wherein the positive electrode rod is made of an elastic conductive material.

7. The power supply for thermoplastic composite material resistance welding of claim 4, wherein the socket comprises a limiter and a positive pin; the limiter is provided with a limiting bayonet matched with the positive electrode joint; the positive electrode pin extends out to the direction deviating from the limiter and can be clamped and fixed with the through hole on the positive electrode plate.

8. The power supply for thermoplastic composite electric resistance welding of claim 4, wherein the housing is an insulated housing and the handle is an insulated handle.

9. A resistance welder for resistance welding of thermoplastic composite materials, characterized in that the resistance welder is powered with a power supply device for resistance welding of thermoplastic composite materials according to any of claims 1-8.

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