An automatic argon arc welding contact arc starting device and operating method

Abstract

The application is a kind of automatic argon arc welding contact arc starting device and operation method, the device includes argon arc welding gun (1), welding machine connector, wire, protective gas pipe, water pipe and switch; its characteristics are that the argon arc welding gun (1) is a kind of automatic argon arc welding contact arc starting device, including argon arc welding gun (1), welding machine connector, wire, protective gas pipe, water pipe and switch; its characteristics are that the center of the gun body of the argon arc welding gun (1) is provided with a protective gas channel (6), the protective gas channel (6) extends to the periphery of the tungsten electrode (12) at the lowermost end of the gun body of the argon arc welding gun (1), and the application is suitable for electrical component welding, narrow space argon arc welding, electromagnetic interference site argon arc welding and the like. In particular, the method has obvious advantages for precise electrical component welding in narrow space.

Description

Technical Field

[0001] This invention belongs to the field of argon arc welding technology, specifically designing an automated argon arc welding contact arc ignition device and its operation method. Background Technology

[0002] Argon arc welding (argon arc welding) is widely used in fields such as nuclear power equipment maintenance and aerospace component manufacturing. However, in applications such as welding electrical components, argon arc welding in confined spaces, argon arc welding of thin-walled materials, and argon arc welding in environments with electromagnetic interference, traditional arc ignition methods face problems such as inaccessible electrodes, difficulty in arc ignition, and poor weld quality stability in confined spaces, and also pose a risk of arc breakdown. Manual contact arc ignition control strategies rely on manual operation, resulting in extremely poor stability. Depending on the operator's skill level, varying degrees of secondary contact and retraction may occur, causing damage to the tungsten electrode. Therefore, there is an urgent need for a miniaturized, electrically linked, and adaptively positioned contact arc ignition device and solution to solve the problem of millimeter-level precise contact arc ignition control in space-constrained and blind operation scenarios. Summary of the Invention

[0003] The purpose of this invention is to provide an automated argon arc welding contact arc ignition device and operating method to solve the above-mentioned defects.

[0004] An automated argon arc welding contact arc ignition device includes an argon arc welding torch 1, a welding machine connector, wires, a protective gas pipe, a water pipe, and a switch; characterized in that a protective gas channel 6 is provided at the center of the torch body of the argon arc welding torch 1, the protective gas channel 6 extends to the area around the tungsten electrode 12 at the lowest end of the torch body of the argon arc welding torch 1, a tungsten electrode clamp 7 is installed near the port of the tungsten electrode 12, the protective gas inlet 8 of the protective gas channel 6 is connected to the protective gas pipe, the torch body of the argon arc welding torch 1 also has a torch cooling water channel 3, the torch cooling water inlet 9 of the torch cooling water channel 3 is connected to the water pipe inlet, the torch cooling water outlet 2 of the torch cooling water channel 3 is connected to the water outlet pipe, and the wires are connected to the torch power connection point 10 in the argon arc welding torch 1;

[0005] There is also a connecting plate 17, a servo motor 13, a welding torch fixing block 20, and a main screw 21. The servo motor 13 is fixed on one side of the upper part of the connecting plate 17, and a slide rail 19 is provided on the same side of the lower part of the connecting plate 17 as the servo motor 13. The welding torch fixing block 20 can move vertically up and down on the slide rail 19. The argon arc welding torch 1 is fixedly connected to the other side of the welding torch fixing block 20. The lower end of the servo motor 13 is connected to the screw 21, which passes through the welding torch fixing block 20 and is spirally connected to the welding torch fixing block 20. During operation, the servo motor 13 drives the welding torch fixing block 20 to move up and down on the slide rail 19 through the screw 21, thereby driving the argon arc welding torch 1 to move vertically up and down.

[0006] An "L"-shaped welding torch moving guide post 5 is installed on the welding torch fixing block 20. One side of the welding torch moving guide post 5 is connected to the welding torch fixing block 20, and the other side of the welding torch moving guide post 5 is connected to the argon arc welding torch 1. A pressure sensor 15 and a spring 16 are installed between the welding torch fixing block 20 and the welding torch moving guide post 5. A limiting pin 14 is provided on the side of the welding torch moving guide post 5 connected to the welding torch fixing block 20. The limiting pin 14 is inserted into the limiting pin hole 4 on the welding torch moving guide post 5 to limit the movement of the argon arc welding torch 1.

[0007] On the other side of the connecting plate 17, there is also a robotic arm connection hole 18. The connecting plate 17 can be connected to a power robotic arm or robot through the robotic arm connection hole 18 to control the movement of the entire device.

[0008] The pressure sensor 15, the arc ignition switch of the argon arc welding machine, and the servo motor 13 are established through an external PLC control unit.

[0009] The argon arc welding torch 1 has a coaxial nested welding torch head made of a tungsten electrode 12 and a retractable insulating ceramic tube 11.

[0010] The tungsten electrode 12 has a trapezoidal end design, a welding torch stroke of ≤10mm, an electrode diameter of 2-3mm, an end face diameter of 0.5-2mm, and a tilt angle of 10-30°.

[0011] An automated method for contact arc ignition in argon arc welding includes the following steps:

[0012] Step 1: Connect the argon arc welding torch 1 and clamp it onto the welding torch fixing block 20;

[0013] Step 2: Position the argon arc welding torch 1 directly above the position to be welded, keeping the electrode perpendicular to the surface to be welded;

[0014] Step 3: Turn on the welding switch, and the welding torch will move downwards by the motor drive device;

[0015] Step 4: After the tungsten electrode 12 of the welding torch comes into contact with the surface to be welded, the pressure sensor 15 triggers the welding power switch, and then the motor synchronously retracts to the specified welding height and quickly completes the contact arc ignition.

[0016] In step four, during the welding process, the PLC system controls the drive device to slowly move down until it makes pre-contact with the surface of the workpiece to be welded. When the pressure is ≥0.5N, the pressure sensor is triggered and a feedback signal is sent to the drive system to control the motor to stop moving.

[0017] In step four, the processes of tungsten electrode 12 contact, motor stopping, arc ignition, and tungsten electrode retraction are completed instantaneously and synchronously. The arc ignition switch is controlled by pressure sensor 15, which triggers high-speed retraction to achieve contact arc ignition without electrode adhesion. The retraction device is driven by electromagnetic drive, pneumatic drive, or spring drive. The retraction response time is 100-999ms, and the retraction speed is 1-5m / s.

[0018] The present invention has at least the following beneficial effects:

[0019] (1) The argon arc welding contact arc ignition device and operation method proposed in this invention realizes automated contact and retraction during the contact arc ignition process. It reduces the dependence on the operator in conventional contact arc ignition methods and can reduce the risk of electrode adhesion damage.

[0020] (2) The argon arc welding contact arc ignition device proposed in this invention is both miniaturized and automated, and is suitable for welding electrical components, argon arc welding in confined spaces, and argon arc welding in electromagnetic interference environments. In particular, this method has significant advantages for welding precision electrical components in confined spaces. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the working state of the device according to an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the argon arc welding torch 1 of the present invention.

[0023] Figure 3 This is a schematic diagram of the structure of the argon arc welding torch 1 of the present invention connected to the connecting plate 17 via the welding torch fixing block 20.

[0024] Figure 4 This is a top view of the product 22 to be welded according to the present invention.

[0025] Among them, 1 is a special argon arc welding torch, 2 is the welding torch cooling water outlet, 3 is the welding torch cooling water channel, 4 is the limit pin hole, 5 is the welding torch moving guide column, 6 is the shielding gas channel, 7 is the tungsten electrode clamp, 8 is the shielding gas inlet, 9 is the welding torch cooling water inlet, 10 is the welding torch power connection point, 11 is the insulating ceramic tube, 12 is the tungsten electrode, 13 is the servo motor, 14 is the limit pin, 15 is the pressure sensor, 16 is the spring, 17 is the connecting plate, 18 is the robotic arm connection hole, 19 is the slide rail, 20 is the welding torch fixing block, 21 is the screw, 22 is the product to be welded, 23 is the electrical component, and 24 is the welding point. Detailed Implementation

[0026] To achieve these objectives and other advantages according to the present invention, an automated argon arc welding contact arc ignition device and operating method are provided, comprising the following steps:

[0027] Step 1: Connect the welding machine to the special welding torch and clamp it onto the contact arc ignition device;

[0028] Step 2: Position the contact arc ignition device directly above the position to be welded, with the electrode perpendicular to the surface to be welded;

[0029] Step 3: Turn on the welding switch, and the welding torch will be moved downward by the motor drive.

[0030] Step 4: After the tungsten electrode of the welding torch contacts the surface to be welded, the pressure sensor triggers the welding power switch, and then the motor synchronously retracts to the specified welding height and quickly completes the contact arc ignition.

[0031] Preferably, in step one, the specially designed welding torch is a coaxial nested welding torch made of a tungsten electrode core and a retractable alumina ceramic outer cover, and the welding torch clamp includes a spring and a pressure sensor. The pressure sensor has an accuracy of ≤0.1N to ensure contact stability.

[0032] Preferably, in step one, the tungsten electrode tip is designed in a trapezoidal shape, the welding torch stroke is ≤10mm, the electrode diameter is 2-3mm, the end face diameter is 0.5-2mm, and the tilt angle is 10-30°.

[0033] Preferably, in step two, the contact arc-initiating device can be fixed to a robotic arm or various industrial robots, and the electrode can be precisely positioned at the millimeter level by operating the robotic arm. The robotic arm can integrate functional modules such as CCD observation and lighting systems.

[0034] Preferably, in step three, the electrode driving device includes, but is not limited to, various driving forms such as electromagnetic driving and pneumatic driving.

[0035] Preferably, in step four, during the welding process, the PLC system controls the drive device to slowly move downwards until it makes pre-contact with the surface of the workpiece to be welded. When the pressure is ≥0.5N, the pressure sensor is triggered, and a feedback signal is sent to the drive system to control the motor to stop moving.

[0036] Preferably, in step four, the processes of tungsten electrode contact, motor cessation, arc ignition, and tungsten electrode retraction are completed instantaneously and synchronously. An arc ignition switch is controlled by a pressure sensor, triggering high-speed retraction to achieve electrode-free contact arc ignition. The retraction device can be driven by, but is not limited to, electromagnetic, pneumatic, or spring-driven mechanisms. The retraction response time is 100–999 ms, and the retraction speed is 1–5 m / s.

[0037] Preferably, the described argon arc welding contact arc ignition device and operating method are suitable for welding electrical components, argon arc welding in confined spaces, and argon arc welding in environments with electromagnetic interference. In particular, this method has significant advantages for welding precision electrical components in confined spaces.

[0038] Preferably, the argon arc welding contact arc ignition device and operating method described herein achieve automated contact and retraction during the contact arc ignition process. This reduces the dependence on the operator in conventional contact arc ignition methods and lowers the risk of electrode adhesion damage.

[0039] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0040] Example 1:

[0041] An automated argon arc welding contact arc ignition device and its operating method include the following steps:

[0042] Step 1: Remove the welding torch body from the front end of the ordinary argon arc welding torch, leaving only the welding machine connector, wires, protective gas pipe, water pipe, and switch. Then connect the protective gas pipe to the protective gas inlet 8 in the argon arc welding torch 1, connect the wires to the welding torch power connection point 10 in the argon arc welding torch 1, connect the water pipe inlet to the welding torch cooling water inlet 9 in the argon arc welding torch 1, and connect the water pipe outlet to the welding torch cooling water outlet 2 in the argon arc welding torch 1. Then connect the welding machine connector at the other end of the cable to the argon arc welding machine.

[0043] Step 2: Fix the argon arc welding torch 1 onto the welding torch fixing block 20, and press the spring 16 and pressure sensor 15 into place. Figure 1 The servo motor 13 is assembled between the argon arc welding torch 1 and the welding torch fixing block 20. A limiting pin 14 is inserted into the limiting pin hole 4 to prevent the argon arc welding torch 1 from moving downwards. The screw 21 of the servo motor 13 is screwed into the welding torch fixing block 20. Then, the slide rail groove on one side of the welding torch fixing block 20 is embedded into the slide rail 19, which is part of the connecting plate 17. Finally, the servo motor is fixed to the connecting plate 17 with bolts. The robotic arm connection hole 18 on the connecting plate 17 can be connected to a power-assisted robotic arm or robot to control the movement of the entire device. Preferably, the pressure sensor accuracy is ≤0.1N.

[0044] Step 3: Establish communication between the pressure sensor 15, the arc ignition switch of the argon arc welding machine, and the servo motor 13 through the external PLC control unit.

[0045] Step 4: Move the argon arc welding torch 1 directly above the welding position by moving the externally assisted robotic arm or robot. Turn on the power of the argon arc welding machine and servo motor 13. The rotation of servo motor 13 controls the up and down movement of welding torch fixing block 20 through screw 21, thereby controlling the up and down movement of argon arc welding torch 1. Servo motor 13 controls the downward movement of argon arc welding torch 1 through screw 21 and welding torch fixing block 20 to gradually contact the welding point 24 of the product 22 to be welded. When the tungsten electrode 12 in argon arc welding torch 1 contacts the welding point 24, the pressure generated by the contact is transmitted to pressure sensor 15 through argon arc welding torch 1 and spring 16. When the pressure sensor reading reaches 0.5N, the arc ignition switch of argon arc welding machine is turned on through PLC control unit. Then servo motor 13 rotates rapidly, causing argon arc welding torch 1 to move up 3mm rapidly through screw 21 and welding torch fixing block 20, igniting the arc and completing the contact arc ignition.

[0046] Step 5: After welding is completed (welding time is set in advance), turn off the arc ignition switch of the welding machine through the PLC control unit, the arc is extinguished, and then control the servo motor 13 to rotate. The argon arc welding gun 1 is moved upward through the screw 21 and the welding gun fixing block 20, so that the tungsten electrode 12 in the argon arc welding gun 1 moves upward past the top of the electrical component 23. Then move the assisting robotic arm or robot to position the argon arc welding gun 1 directly above the next welding position.

[0047] An automated argon arc welding contact arc ignition device and its operating method are disclosed. The device includes a coaxial nested telescopic welding torch, a built-in pressure sensor, and an electrode drive system. The operating method of the device includes the following steps:

[0048] Step 1: Connect the welding machine to the special welding torch and clamp it onto the contact arc ignition device;

[0049] Step 2: Position the contact arc ignition device directly above the position to be welded, with the electrode perpendicular to the surface to be welded;

[0050] Step 3: Turn on the welding switch, and the welding torch will be moved downward by the motor drive.

[0051] Step 4: After the welding torch comes into contact with the surface to be welded, the pressure sensor triggers the welding power switch. Then the motor controls the welding torch to retract synchronously to the specified welding height and quickly complete the contact arc ignition.

[0052] In step one, the specially made welding torch is made of a tungsten electrode core and a retractable ceramic outer cover to form a coaxial nested welding torch. The welding torch clamp includes a spring and a pressure sensor.

[0053] The inner core of the tungsten electrode increases the diameter of the electrode tip to reduce contact resistance and prevent electrode adhesion, and increases the length of the tungsten electrode to improve welding accessibility in confined spaces. The tungsten electrode tip is designed in a trapezoidal shape, with a welding torch stroke ≤10mm, a tungsten electrode diameter of 2-3mm, an end face diameter of 0.5-2mm, and a tilt angle of 10-30°.

[0054] The pressure sensor has an accuracy of ≤0.1N, ensuring contact stability.

[0055] In step one, the welding machine is a conventional argon arc welding equipment. The welding parameters are adjusted according to the application scenario, with the welding current being DC, ranging from 10 to 60A. No modification to the welding machine or correction of the welding current waveform is required.

[0056] In step two, the contact arc-initiating device can be fixed to a custom bracket or integrated with a robotic arm.

[0057] In step three, the electrode driving device includes, but is not limited to, various driving forms such as electromagnetic driving and pneumatic driving.

[0058] In step four, during the welding process, the PLC system controls the drive device to slowly move down until the tungsten electrode of the welding torch makes pre-contact with the surface of the workpiece to be welded. When the pressure is ≥0.5N, the pressure sensor is triggered and a feedback signal is sent to the drive system to control the tungsten electrode to stop moving.

[0059] In step four, the arc-ignition switch is activated upon initial contact. Once the pressure sensor detects that the pressure has reached a threshold, a high-speed retraction is triggered, achieving non-adhesive contact arc ignition. The tungsten electrode retraction device can be driven, but is not limited to, electromagnetic, pneumatic, or spring-driven methods. The retraction response time is 100–999 ms, and the retraction speed is 1–5 m / s.

[0060] The described contact arc ignition method is applicable to scenarios including, but not limited to, welding of electrical components, argon arc welding in confined spaces, argon arc welding of thin-walled materials, and argon arc welding in environments with electromagnetic interference. In particular, this method has significant advantages for welding precision electrical components in confined spaces.

[0061] This method automates the contact and retraction process during arc ignition. It reduces the reliance on operators in conventional contact arc ignition methods and lowers the risk of electrode adhesion damage.

[0062] This invention discloses an automated argon arc welding contact arc ignition device and its operation method. The device includes: a special welding torch, a pressure sensing system, an electrode driving system, an electrode fixing device, an automatic springback system, and corresponding fasteners.

[0063] (1) A coaxial nested special welding torch is fixed on the welding torch bracket;

[0064] (2) The motor drives the tungsten electrode to move vertically at a constant speed;

[0065] (3) The pressure sensor is triggered the instant the tungsten electrode comes into contact with the workpiece, which controls the arc ignition of the welding machine;

[0066] (4) The automatic rebound mechanism after arc ignition controls the tungsten electrode to quickly lift up and generate an electric arc;

[0067] (5) After welding is completed, turn off the welding machine power and control the arc to extinguish;

[0068] (6) In particular, the arc-starting device is suitable for welding in narrow spaces with a minimum diameter of 5 mm, enabling contact arc-starting in blind spots and automatic electrode reset.

[0069] An automated argon arc welding contact arc ignition device includes an argon arc welding torch (1), a welding machine connector, wires, a protective gas pipe, a water pipe, and a switch; characterized in that the argon arc welding torch (1) has a protective gas channel 6 at the center of its body, which extends to the tungsten electrode 12 at the bottom of the torch body, and a tungsten electrode clamp 7 is installed near the port of the tungsten electrode 12. The protective gas inlet 8 of the protective gas channel 6 is connected to the protective gas pipe. The torch body also has a torch cooling water channel 3, where the torch cooling water inlet 9 is connected to the water pipe inlet, and the torch cooling water outlet 2 is connected to the water outlet pipe. The wires are connected to the torch power connection point 10 in the argon arc welding torch.

[0070] There is also a connecting plate 17, a servo motor 13, a welding torch fixing block 20, and a main screw 21. The servo motor 13 is fixed on one side of the upper part of the connecting plate 17, and a slide rail 19 is provided on the same side of the lower part of the connecting plate 17 as the servo motor 13. The welding torch fixing block 20 can move vertically up and down on the slide rail 19. The argon arc welding torch 1 is fixedly connected to the other side of the welding torch fixing block 20. The lower end of the servo motor 13 is connected to the screw 21, which passes through the welding torch fixing block 20 and is spirally connected to the welding torch fixing block 20. During operation, the servo motor 13 drives the welding torch fixing block 20 to move up and down on the slide rail 19 through the screw 21, thereby driving the argon arc welding torch 1 to move vertically up and down.

[0071] An "L"-shaped welding torch moving guide post 5 is installed on the welding torch fixing block 20. One side of the welding torch moving guide post 5 is connected to the welding torch fixing block 20, and the other side of the welding torch moving guide post 5 is connected to the argon arc welding torch 1. A pressure sensor 15 and a spring 16 are installed between the welding torch fixing block 20 and the welding torch moving guide post 5. A limiting pin 14 is provided on the side of the welding torch moving guide post 5 connected to the welding torch fixing block 20. The limiting pin 14 is inserted into the limiting pin hole 4 on the welding torch moving guide post 5 to limit the movement of the argon arc welding torch 1.

[0072] On the other side of the connecting plate 17, there is also a robotic arm connection hole 18. The connecting plate 17 can be connected to a power robotic arm or robot through the robotic arm connection hole 18 to control the movement of the entire device.

[0073] The pressure sensor 15, the arc ignition switch of the argon arc welding machine, and the servo motor 13 are established through an external PLC control unit.

[0074] The argon arc welding torch 1 has a coaxial nested welding torch head made of a tungsten electrode 12 and a retractable insulating ceramic tube 11.

[0075] The tungsten electrode 12 has a trapezoidal end design, a welding torch stroke of ≤10mm, an electrode diameter of 2-3mm, an end face diameter of 0.5-2mm, and a tilt angle of 10-30°.

[0076] An automated argon arc welding contact arc ignition device and an automated argon arc welding contact arc ignition operation method are provided, characterized in that, in order to achieve these objectives and other advantages according to the present invention, an automated argon arc welding contact arc ignition device and operation method are provided, comprising the following steps:

[0077] Step 1: Connect the argon arc welding torch 1 and clamp it onto the welding torch fixing block 20;

[0078] Step 2: Position the argon arc welding torch 1 directly above the position to be welded, keeping the electrode perpendicular to the surface to be welded;

[0079] Step 3: Turn on the welding switch, and the welding torch will move downwards by the motor drive device;

[0080] Step 4: After the tungsten electrode 12 of the welding torch comes into contact with the surface to be welded, the pressure sensor 15 triggers the welding power switch, and then the motor synchronously retracts to the specified welding height and quickly completes the contact arc ignition.

[0081] In step four, during the welding process, the PLC system controls the drive device to slowly move down until it makes pre-contact with the surface of the workpiece to be welded. When the pressure is ≥0.5N, the pressure sensor is triggered and a feedback signal is sent to the drive system to control the motor to stop moving.

[0082] In step four, the processes of tungsten electrode 12 contact, motor stopping, arc ignition, and tungsten electrode retraction are completed instantaneously and synchronously. The arc ignition switch is controlled by pressure sensor 15, which triggers high-speed retraction to achieve contact arc ignition without electrode adhesion. The retraction device is driven by electromagnetic drive, pneumatic drive, or spring drive. The retraction response time is 100-999ms, and the retraction speed is 1-5m / s.

[0083] This invention presents for the first time an automated contact arc ignition device and its operating method for TIG welding. This method controls automatic arc ignition, automatic welding, and self-extinguishing within a confined space using an arc ignition device. It achieves millisecond-level instantaneous arc ignition, controllable welding height, and a safe and controllable welding process. It effectively avoids problems such as arc burns and tungsten inclusions caused by conventional arc ignition methods. In particular, it has practical value for engineering applications of contact arc ignition TIG welding in confined spaces.

Claims

1. An automated argon arc welding contact arc ignition device, comprising an argon arc welding torch (1), a welding machine connector, wires, a protective gas pipe, a water pipe, and a switch; characterized in that, Argon arc welding torch (1) An automated argon arc welding contact arc ignition device, comprising an argon arc welding torch (1), a welding machine connector, a wire, a protective gas pipe, a water pipe and a switch; characterized in that a protective gas channel (6) is provided in the center of the argon arc welding torch (1), the protective gas channel (6) extends all the way to the tungsten electrode (12) at the bottom of the argon arc welding torch (1), a tungsten electrode clamp (7) is installed near the port of the tungsten electrode (12), the protective gas inlet (8) of the protective gas channel (6) is connected to the protective gas pipe, the argon arc welding torch (1) is also provided with a welding torch cooling water channel (3), the welding torch cooling water inlet (9) in the welding torch cooling water channel (3) is connected to the water pipe inlet, the welding torch cooling water outlet (2) in the welding torch cooling water channel (3) is connected to the water outlet pipe, and the wire is connected to the welding torch power connection point (10) in the argon arc welding torch (1); There is also a connecting plate (17), a servo motor (13), a welding torch fixing block (20) and a main screw (21). The servo motor (13) is fixed on one side of the upper part of the connecting plate (17), and a slide rail (19) is provided on the same side of the lower part of the connecting plate (17) as the servo motor (13). The welding torch fixing block (20) can move vertically up and down on the slide rail (19). The other side of the welding torch fixing block (20) is fixedly connected to the argon arc welding torch (1). The lower end of the servo motor (13) is connected to the screw (21), which passes through the welding torch fixing block (20) and is spirally connected to the welding torch fixing block (20). When working, the servo motor (13) drives the welding torch fixing block (20) to move up and down on the slide rail (19) through the screw (21), thereby driving the argon arc welding torch (1) to move vertically up and down.

2. The automated argon arc welding contact arc ignition device according to claim 1, characterized in that, An "L"-shaped welding torch moving guide post (5) is installed on the welding torch fixing block (20). One side of the welding torch moving guide post (5) is connected to the welding torch fixing block (20), and the other side of the welding torch moving guide post (5) is connected to the argon arc welding torch (1). A pressure sensor (15) and a spring (16) are installed between the welding torch fixing block (20) and the welding torch moving guide post (5). A limit pin (14) is provided on the side of the welding torch moving guide post (5) connected to the welding torch fixing block (20). The limit pin (14) is inserted into the limit pin hole (4) on the welding torch moving guide post (5) to limit the movement of the argon arc welding torch (1).

3. The automated argon arc welding contact arc ignition device according to claim 1, characterized in that, On the other side of the connecting plate (17), there is also a robotic arm connection hole (18). The connecting plate (17) can be connected to a power robotic arm or robot through the robotic arm connection hole (18) to control the movement of the entire device.

4. The automated argon arc welding contact arc ignition device according to claim 1, characterized in that, The pressure sensor (15), the arc-starting switch of the argon arc welding machine, and the servo motor (13) are established through an external PLC control unit.

5. An automated argon arc welding contact arc ignition device according to claim 1 or 4, characterized in that, The argon arc welding torch (1) has a torch head made of a tungsten electrode (12) and a retractable insulating ceramic tube (11) in a coaxial nested welding torch head.

6. An automated argon arc welding contact arc ignition device according to claim 5, characterized in that, The tungsten electrode (12) end is designed in a trapezoidal shape, the welding torch stroke is ≤10mm, the electrode diameter is 2~3mm, the end face diameter is 0.5~2mm, and the tilt angle is 10~30°.

7. A method for igniting an arc using an automated argon arc welding contact arc ignition device as described in claims 1 to 6, characterized in that... Includes the following steps: Step 1: Connect and clamp the argon arc welding torch (1) onto the welding torch fixing block (20); Step 2: Position the argon arc welding gun (1) directly above the position to be welded, with the electrode perpendicular to the surface to be welded; Step 3: Turn on the welding switch, and the welding torch will move downwards by the motor drive device; Step 4: After the tungsten electrode (12) of the welding torch comes into contact with the surface to be welded, the pressure sensor (15) triggers the welding power switch, and then the motor synchronously retracts to the specified welding height and quickly completes the contact arc ignition.

8. The automated argon arc welding contact arc ignition operation method according to claim 8, characterized in that, In step four, during the welding process, the PLC system controls the drive device to slowly move down until it makes pre-contact with the surface of the workpiece to be welded. When the pressure is ≥0.5N, the pressure sensor is triggered and a feedback signal is sent to the drive system to control the motor to stop moving.

9. The automated argon arc welding contact arc ignition operation method according to claim 7, characterized in that, In step four, the processes of tungsten electrode (12) contact, motor stop moving, arc ignition start, and tungsten electrode retraction are completed instantaneously and synchronously; the arc ignition switch is controlled by pressure sensor (15) and high-speed retraction is triggered to achieve contact arc ignition without electrode adhesion; the retraction device is driven by electromagnetic drive, pneumatic drive or spring drive; the retraction response time is 100-999ms and the retraction speed is 1-5m / s.

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