Polarity-variable welding system

Abstract

The utility model relates to the technical field of welding, in particular to a polarity-variable welding system, which comprises a polarity-variable power supply, a first output interface of the polarity-variable power supply is connected with a welding tool through a first cable, and a second output interface of the polarity-variable power supply is connected with a workpiece through a second cable; the receiver is used for receiving a signal transmitted by the remote controller and allowing the controller to respond to the signal so as to control welding parameters of the variable polarity power supply; and a polarity switching module is arranged in the polarity-variable power supply and is used for exchanging polarities of the first output interface and the second output interface according to an instruction of the controller. By using the system, a welder only needs to pull the first cable and the air pipe to a construction site, and the second cable can be directly connected with a high tower base or a station base nearby, so that the labor intensity is reduced; when welding parameters need to be adjusted or a welding process needs to be switched, the polarity-variable power supply can be remotely controlled by using a remote controller without frequently going back and forth to a construction site and a welding machine installation site, so that the construction efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of welding technology, and in particular to a welding system with variable polarity. Background Technology

[0002] In existing welding operations, both argon arc welding and manual shielded metal arc welding are required for entry and exit, commonly known as argon-electric combined welding. However, in argon arc welding, the workpiece is generally connected to the positive electrode (DCEP, DC electrode positive), while in manual shielded metal arc welding, the workpiece is generally connected to the negative electrode (DCEN, DC electrode negative).

[0003] Currently, there are two common technical solutions for using TIG welding. One involves using two sets of welding equipment: one TIG welding power source and one manual welding power source. For the TIG welding power source, the positive cable is connected to the workpiece, and the gas hose and the negative cable are routed to the welding site. For the manual welding power source, the negative cable is connected to the workpiece, and the positive cable is routed to the welding site.

[0004] Secondly, a multi-functional welding power source should be used, capable of both TIG welding and manual arc welding. The positive and negative cables and gas hose of the power source should be routed to the work site. When performing TIG welding, connect the TIG welding torch to the negative cable and gas hose, and the workpiece to the positive cable. When performing manual arc welding, connect the welding torch to the positive cable and the workpiece to the negative cable. During implementation, it is also necessary to select the appropriate welding mode and adjust the corresponding welding parameters (mainly the welding current) at the welding power source location.

[0005] However, in actual construction, especially when welding operations are carried out at the site or on a high tower, both of the above solutions require pulling the positive and negative cables and air pipes of the welding power source to the construction site. The combined weight of the cables and air pipes is often quite heavy. Especially when the distance between the construction site at the site or on the high tower and the welding machine is far, pulling by manpower will place a heavy burden on the welder, increase the labor intensity, and pose significant safety hazards. Furthermore, during the construction process, the welder needs to travel back and forth between the construction site and the welding machine to adjust the welding parameters as needed, resulting in low welding efficiency and low convenience for welding personnel. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of existing welding systems that require pulling positive and negative cables to the construction site when using argon-electric welding, and needing to travel back and forth between the construction site and the welding machine placement point to adjust welding parameters, resulting in low work efficiency and high labor intensity. This invention provides a welding system with variable polarity.

[0007] In a first aspect, the present invention provides a variable polarity welding system, comprising:

[0008] A variable polarity power supply, comprising a first output interface and a second output interface, wherein the first output interface is connected to a welding tool via a first cable, and the second output interface is connected to a workpiece via a second cable;

[0009] The remote controller, receiver, and controller are provided. The remote controller is wirelessly connected to the receiver. The receiver is used to receive signals transmitted by the remote controller and allows the controller to respond to the signals to control the welding parameters of the variable polarity power supply.

[0010] The variable polarity power supply is equipped with a polarity switching module, which is used to switch the polarity of the first output interface and the second output interface according to the instructions of the controller.

[0011] The variable polarity welding system provided by this invention enables remote control of welding parameters through a wireless connection between a remote controller and a receiver. A controller manages the polarity switching module, thereby exchanging the polarity between the first and second output interfaces. In other words, the system design ensures that the first cable can always be used as a welding cable, while the second cable is always used as a grounding cable. In actual construction, especially during argon-electric welding operations at sites or high towers, the welder only needs to pull the first cable (as the welding cable) and the gas pipe to the construction site, while the second cable (as the grounding cable) can be directly connected to the tower base or site base nearby. This significantly reduces the welder's workload, and when adjustments to welding parameters or switching welding processes are needed, the welder can adjust the parameters at the construction site using a remote control to operate the variable polarity power supply, eliminating the need for frequent trips between the construction site and the welding machine location, thus significantly improving construction efficiency.

[0012] Preferably, the polarity switching module includes a double-pole double-throw circuit, which is controlled by the controller to exchange the polarity of the first output interface and the second output interface.

[0013] The preferred polarity switching module includes a double-pole double-throw circuit. This circuit has a mature structure and simple design, and can provide good electrical isolation and anti-interference capabilities. After receiving the control command, it can quickly and accurately complete the polarity exchange between the first output interface and the second output interface, reducing welding quality problems caused by inaccurate or delayed polarity switching, thereby improving the overall stability and reliability of the system.

[0014] Preferably, the polarity switching module includes an H-bridge circuit, which is controlled by the controller to exchange the polarity of the first output interface and the second output interface.

[0015] H-bridge circuits typically utilize four power semiconductor devices to implement electronic switching, such as IGBTs (Insulated Gate Bipolar Transistors). These semiconductor devices are arranged in an "H" shape to control the direction of current flow through the load. They can quickly complete polarity reversal after receiving control commands, thereby ensuring response speed and stability during the welding process, maintaining the stability of the welding current, and helping to maintain welding quality.

[0016] Preferably, the welding tool includes an argon arc welding gun and a manual welding torch. When the argon arc welding gun is connected to the first output interface, the polarity of the first output interface is negative and the polarity of the second output interface is positive. When the manual welding torch is connected to the first output interface, the polarity of the first output interface is positive and the polarity of the second output interface is negative.

[0017] This configuration enables the variable polarity welding system provided by this invention to accurately adapt to both argon arc welding and manual electric arc welding processes, thus meeting the requirements of argon-electric welding.

[0018] Preferably, the welding tool includes an argon arc welding gun and a manual welding torch. One end of the first cable is connected to the first output interface, and the other end is provided with a detachable connector for selectively connecting to the argon arc welding gun or the manual welding torch.

[0019] The detachable connector allows welders to easily connect the first cable to different welding tools according to the actual welding process requirements, thereby enabling rapid switching between argon arc welding and manual arc welding.

[0020] Preferably, when the argon arc welding torch is connected to the first output interface, the argon arc welding torch is also connected to a gas cylinder via a gas pipe.

[0021] With this structural setup, the gas cylinder provides a stable supply of argon gas, which is delivered to the argon arc welding torch through a gas pipe. This creates an effective protective atmosphere during the welding process, preventing the weld pool from being contaminated by elements such as oxygen and nitrogen in the air, thereby improving the weld quality.

[0022] Preferably, a switch is provided at one end of the gas pipe near the argon arc welding torch, and the switch is used to control the gas flow in and out of the gas pipe.

[0023] With this structural design, by placing a control switch near the welding torch, the welder can shut off the argon gas supply in a timely manner, reducing safety hazards caused by gas leaks when welding tools need to be replaced or maintenance is required.

[0024] Preferably, the welding parameters include welding process and welding current, and the welding process includes argon arc welding and manual electric arc welding.

[0025] The system has two preset modes: argon arc welding and manual electric arc welding. Welders can easily switch between different processes and remotely adjust the welding current using a remote control. This eliminates the need for welders to frequently travel between the welding machine installation point and the construction site, thereby reducing labor intensity, shortening debugging time, improving overall work efficiency, and reducing safety hazards caused by human error.

[0026] Preferably, the remote controller is equipped with a display screen and an operation panel. The display screen is used to display the welding parameters, and the operation panel is used to set the welding parameters. The remote controller supports two-way communication to receive feedback signals from a variable polarity power supply.

[0027] The remote control features a display screen that shows real-time parameters such as welding current and current welding process mode, allowing welders to monitor the welding status at any time, avoiding blind adjustments and improving parameter accuracy. The operation panel, with its buttons, knobs, or touch controls, allows welders to quickly modify and set welding parameters on-site, offering convenient operation without the need for external equipment and greatly improving parameter adjustment efficiency. The remote control supports two-way communication, receiving feedback signals from variable polarity power supplies to monitor the welding machine's operating status and output anomaly alarms in real time. Welders can adjust their strategies promptly based on this feedback, improving operational safety and reliability.

[0028] Preferably, it also includes a power cable connected to the variable polarity power supply for inputting external power to the variable polarity power supply.

[0029] By connecting to a variable polarity power source via a dedicated power cable, a stable and efficient external power supply can be ensured to the welding power source, providing a continuous and reliable power supply for the entire welding system.

[0030] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0031] 1. This utility model provides a variable polarity welding system. The first cable can always be used as a welding cable, while the second cable is always used as a grounding cable. The welder only needs to pull the first cable (as the welding cable) and the air pipe to the construction site, while the second cable (as the grounding cable) can be directly connected to the tower base or station base nearby. This not only greatly reduces the labor intensity of the welder, but also allows the welder to adjust the parameters or switch the welding process by using a remote control to control the variable polarity power supply at the construction site when it is necessary to adjust the parameters. There is no need to frequently travel between the construction site and the welding machine installation point, thus significantly improving the construction efficiency. Attached Figure Description

[0032] Figure 1 A schematic diagram of a variable polarity welding system in the argon arc welding process;

[0033] Figure 2 A schematic diagram of a variable polarity welding system in the manual arc welding process;

[0034] Figure 3 This is a schematic diagram of a double-pole double-throw circuit;

[0035] Figure 4 The second schematic diagram of a double-pole double-throw circuit;

[0036] Figure 5 This is one of the schematic diagrams of an H-bridge circuit;

[0037] Figure 6 The second schematic diagram of an H-bridge circuit.

[0038] Marked in the image:

[0039] 1-Variable polarity power supply, 11-First output interface, 111-First cable, 12-Second output interface, 121-Second cable, 13-Double-pole double-throw circuit, 14-H-bridge circuit, 2-Remote control, 21-Display screen, 22-Operation panel, 3-Receiver, 4-Controller, 51-Argon arc welding torch, 52-Manual welding torch, 6-Gas hose, 7-Gas cylinder, 8-Switch, 9-Power cable, 100-Workpiece. Detailed Implementation

[0040] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0041] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0042] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0043] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0044] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0045] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0046] Example 1

[0047] This embodiment provides a variable polarity welding system, including:

[0048] The variable polarity power supply 1 includes a first output interface 11 and a second output interface 12. The first output interface 11 is connected to the welding tool via a first cable 111, and the second output interface 12 is connected to the workpiece 100 via a second cable 121.

[0049] Specifically, such as Figure 1 , Figure 2As shown, in this embodiment, the first output interface 11 can be a welding interface, and the corresponding first cable 111 can be a welding cable; the second output interface 12 can be a grounding interface, and the corresponding second cable 121 can be a grounding cable.

[0050] The variable polarity welding system also includes a remote controller 2, a receiver 3, and a controller 4. The remote controller 2 and the receiver 3 are wirelessly connected. The receiver 3 is used to receive signals transmitted by the remote controller 2 and allows the controller 4 to respond to the signals to control the welding parameters of the variable polarity power supply 1.

[0051] Specifically, in this embodiment, the welding parameters of the variable polarity power supply 1 may include welding process and welding current. Furthermore, the welding process includes argon arc welding and manual arc welding. The system has two preset modes: argon arc welding and manual arc welding. This allows welders to easily switch between different processes using the remote control 2 and remotely adjust the welding current. This eliminates the need for welders to frequently travel between the welding machine installation point and the construction site, thereby reducing labor intensity, shortening debugging time, improving overall work efficiency, and reducing safety hazards caused by human error.

[0052] Furthermore, such as Figure 1 , Figure 2 As shown, the remote controller 2 is equipped with a display screen 21 and an operation panel 22. The display screen 21 is used to display welding parameters, and the operation panel 22 is used to set welding parameters. The remote controller 2 supports two-way communication to receive feedback signals from the variable polarity power supply 1.

[0053] The remote controller 2 is equipped with a display screen 21, which can display parameters such as welding current and current welding process mode in real time, allowing welders to keep track of the welding status at any time, avoiding "blind adjustment" and improving the accuracy of parameter adjustment. The operation panel 22, with its button, knob, or touch design, allows welders to quickly modify and set welding parameters on the construction site. It is easy to operate and does not require external equipment, greatly improving the efficiency of parameter adjustment. The remote controller 2 supports two-way communication and can receive feedback signals from the variable polarity power supply 1, so as to keep track of the welding machine's operating status, output abnormality alarms, and other information in real time. Welders can adjust their strategies in a timely manner based on the feedback, improving the safety and reliability of the operation.

[0054] The variable polarity power supply 1 is equipped with a polarity switching module, which is used to switch the polarity of the first output interface 11 and the second output interface 12 according to the instructions of the controller 4.

[0055] The specific workflow is explained in further detail below:

[0056] S1. Welder operates remote control 2: The welder presses the "Argon Arc Welding (Manual Arc Welding)" button on the remote control and sets the current to 150A; Remote control 2 can send signals through its radio frequency module (e.g., nRF24L01 wireless transceiver module), the specific content of which can be "Process = Argon Arc Welding (Manual Arc Welding), Current = 150A".

[0057] S2. Receiver 3 receives signals: Receiver 3 (e.g., nRF24L01 receiver) can capture signals and convert them into digital data (e.g., serial port signal: 9600bps), and the data is transmitted to controller 4 through physical connections (e.g., I2C or UART).

[0058] S3. Controller 4 response signal: Controller 4 (e.g., STM32F103 microcontroller) analyzes the signal and identifies the instruction as "argon arc welding (manual arc welding) mode, 150A". Controller 4 can further generate two types of control signals: one is welding parameter adjustment: the output current is set to 150A through the internal circuit of the power supply; the other is polarity switching instruction: a signal is sent to the polarity switching module, requiring the first output interface 11 to be negative (positive) and the second output interface 12 to be positive (negative).

[0059] S4. Polarity switching module execution: The polarity switching module switches the internal circuit so that the first output interface 11 is the negative (positive) terminal and the second output interface 12 is the positive (negative) terminal.

[0060] S5. Welding execution: The welder operates the welding tools to perform welding.

[0061] S6. Feedback Execution: The power supply detects that the actual current is 148A and the temperature is normal, and generates a feedback signal. The controller 4 sends the feedback back to the remote controller 2 through the receiver 3; the display screen 21 of the remote controller 2 displays: "Current: 148A, Status: Normal".

[0062] It is understood that the wireless connection here can be Bluetooth, WIFI, radio frequency, or infrared, etc., without any specific restrictions.

[0063] Furthermore, in this embodiment, the welding tool can specifically be an argon arc welding gun 51 and a manual welding torch 52. When the argon arc welding gun 51 is connected to the first output interface 11, the polarity of the first output interface 11 is negative and the polarity of the second output interface 12 is positive.

[0064] When a manual soldering torch 52 is connected to the first output interface 11, the polarity of the first output interface 11 is positive and the polarity of the second output interface 12 is negative.

[0065] Furthermore, in this embodiment or other embodiments, one end of the first cable 111 is connected to the first output interface 11, and the other end is provided with a detachable connector for selective connection with the argon arc welding gun 51 or the manual welding torch 52. For example, the first cable 111, located away from the first output interface 11, can be configured as a quick-plug connector to facilitate connection with the argon arc welding gun 51 or the manual welding torch 52, allowing the welder to quickly switch between the two welding modes, thereby achieving rapid switching between argon arc welding and manual arc welding.

[0066] Furthermore, when the welding system uses argon arc welding, that is, when the argon arc welding torch 51 is connected to the first output interface 11, the system also includes a gas pipe 6 and a gas cylinder 7. A switch 8 is set at one end of the gas pipe 6 near the argon arc welding torch 51. The switch 8 is used to control the gas flow in and out of the gas pipe 6. The specific switch 8 can be a ball valve, needle valve, solenoid valve, etc. The argon arc welding torch 51 is connected to the gas cylinder 7 through the gas pipe 6.

[0067] Gas cylinder 7 provides a stable supply of argon gas, which is delivered to the argon arc welding torch 51 via gas pipe 6. This creates an effective protective atmosphere during welding, preventing the weld pool from being contaminated by elements such as oxygen and nitrogen in the air, thereby improving weld quality. By installing a control switch 8 near the welding torch, the welder can promptly shut off the argon gas supply, reducing safety hazards caused by gas leaks when welding tools need to be replaced or maintenance is required.

[0068] Furthermore, such as Figure 1 , Figure 2 As shown, the welding system may also include a power cable 9, which is connected to a variable polarity power supply 1 for inputting external power to the variable polarity power supply 1.

[0069] The variable polarity welding system provided in this embodiment enables remote control of welding parameters through a wireless connection between the remote controller 2 and the receiver 3. The controller 4 controls the polarity switching module, thereby exchanging the polarity between the first output interface 11 and the second output interface 12. In other words, the system design ensures that the first cable 111 can always be used as a welding cable, while the second cable 121 is always used as a grounding cable. In actual construction, especially when performing argon-electric welding operations at a site or on a high tower, the welder only needs to pull the first cable 111 (as the welding cable) and the gas pipe 6 to the construction site, while the second cable 121 (as the grounding cable) can be directly connected to the tower base or site base nearby. This not only greatly reduces the welder's labor intensity, but also allows the welder to adjust welding parameters or switch welding processes simply by using the remote controller 2 to control the variable polarity power supply 1 at the construction site, eliminating the need for frequent trips between the construction site and the welding machine location, thus significantly improving construction efficiency.

[0070] Example 2

[0071] Based on Embodiment 1, this embodiment provides a further description of the polarity switching module. In this embodiment, the polarity switching module includes a double-pole double-throw circuit 13, which is controlled by the controller 4 to exchange the polarity of the first output interface 11 and the second output interface 12.

[0072] Specifically, such as Figures 1-4 As shown in the figure, the thick black line indicates the direction of current. The preferred polarity switching module includes a double-pole double-throw circuit 13. This circuit has a mature structure and simple design, and can provide good electrical isolation and anti-interference capabilities. After receiving the control command, it can quickly and accurately complete the polarity exchange between the first output interface 11 and the second output interface 12, reducing welding quality problems caused by inaccurate or delayed polarity switching, thereby improving the overall stability and reliability of the system.

[0073] Example 3

[0074] Based on Embodiment 1, this embodiment further describes the polarity switching module. In this embodiment, the polarity switching module includes an H-bridge circuit 14, which is controlled by the controller 4 to exchange the polarity of the first output interface 11 and the second output interface 12. Specifically, as shown... Figure 1 , Figure 2 , Figure 5 , Figure 6 As shown, Figure 5 With Q1 and Q4 turned on, and Q2 and Q3 turned off, the thick black lines in the diagram indicate the direction of the current. Figure 6 It turns on Q3 and Q2, and turns off Q1 and Q4. The thick black line in the diagram shows the direction of the current. The H-bridge circuit 14 typically utilizes four power semiconductor devices (…). Figure 5 , Figure 6 The electronic switches (Q1, Q2, Q3, Q4) are implemented, specifically IGBTs (Insulated Gate Bipolar Transistors). The semiconductor devices are arranged in an "H" shape to control the direction of current flow through the load. They can quickly complete the polarity exchange after receiving the control command, thereby ensuring the response speed and stability during the welding process, maintaining the stability of the welding current, and helping to maintain the welding quality.

[0075] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A variable polarity welding system, characterized in that, include: A variable polarity power supply (1) includes a first output interface (11) and a second output interface (12). The first output interface (11) is connected to a welding tool via a first cable (111), and the second output interface (12) is connected to a workpiece (100) via a second cable (121). The remote controller (2), receiver (3) and controller (4) are wirelessly connected. The receiver (3) is used to receive signals transmitted by the remote controller (2) and allows the controller (4) to respond to the signals to control the welding parameters of the variable polarity power supply (1). The variable polarity power supply (1) is equipped with a polarity switching module, which is used to switch the polarity of the first output interface (11) and the second output interface (12) according to the instructions of the controller (4).

2. The variable polarity welding system according to claim 1, characterized in that, The polarity switching module includes a double-pole double-throw circuit (13), which is controlled by the controller (4) to exchange the polarity of the first output interface (11) and the second output interface (12).

3. The variable polarity welding system according to claim 1, characterized in that, The polarity switching module includes an H-bridge circuit (14), which is controlled by the controller (4) to switch the polarity of the first output interface (11) and the second output interface (12).

4. A variable polarity welding system according to claim 1, characterized in that, The welding tools include an argon arc welding gun (51) and a manual welding torch (52). When the argon arc welding gun (51) is connected to the first output interface (11), the polarity of the first output interface (11) is negative and the polarity of the second output interface (12) is positive. When the manual welding torch (52) is connected to the first output interface (11), the polarity of the first output interface (11) is positive and the polarity of the second output interface (12) is negative.

5. A variable polarity welding system according to claim 1, characterized in that, The welding tools include an argon arc welding gun (51) and a manual welding torch (52). One end of the first cable (111) is connected to the first output interface (11), and the other end is provided with a detachable connector for selectively connecting to the argon arc welding gun (51) or the manual welding torch (52).

6. A variable polarity welding system according to claim 4 or 5, characterized in that, When the argon arc welding gun (51) is connected to the first output interface (11), the argon arc welding gun (51) is also connected to the gas cylinder (7) through the gas pipe (6).

7. A variable polarity welding system according to claim 6, characterized in that, A switch (8) is provided at one end of the gas pipe (6) near the argon arc welding gun (51), and the switch (8) is used to control the gas flow of the gas pipe (6).

8. A variable polarity welding system according to claim 1, characterized in that, The welding parameters include welding process and welding current, and the welding process includes argon arc welding and manual electric arc welding.

9. A variable polarity welding system according to claim 8, characterized in that, The remote controller (2) is equipped with a display screen (21) and an operation panel (22). The display screen (21) is used to display the welding parameters, and the operation panel (22) is used to set the welding parameters. The remote controller (2) supports bidirectional communication to receive feedback signals from the variable polarity power supply (1).

10. A variable polarity welding system according to claim 1, characterized in that, It also includes a power cable (9) connected to the variable polarity power supply (1) for inputting external power to the variable polarity power supply (1).

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