Automatic welding device and welding method for blind welding of ultrafine wire and micro tube

Abstract

The application relates to an automatic welding device and a welding method for blind welding of superfine wires and micro tubes, which comprises a wire pushing unit, a tubular workpiece feeding unit and a welding unit. The wire pushing unit comprises a lead wire clamp plate for clamping and moving the wire, a wire threading clamp for supporting the wire, and a servo motor located below the lead wire clamp plate for driving the lead wire clamp plate to move forward. The tubular workpiece feeding unit comprises a feeding platform for placing the tubular workpiece, a feeding mechanism for conveying the tubular workpiece to the feeding platform, and a feeding platform cylinder for controlling the forward movement of the feeding platform. The welding unit comprises an upper point welding electrode and a lower point welding electrode. The servo motor controls the forward movement of the lead wire clamp plate to the welding position, the wire head passes through the wire threading clamp to above the lower point welding electrode, the feeding platform moves forward to wrap the tubular workpiece on the lower point welding electrode and tightly contact the wire, the upper point welding electrode is downwardly tightly contacted with the tubular workpiece to form a loop welding with the lower point welding electrode. Compared with the prior art, the application can automatically weld in the tubular workpiece, improve the production efficiency and reduce the labor cost.

Description

Technical Field

[0001] This invention belongs to the field of welding technology, and in particular relates to an automatic welding device and welding method for blind welding of ultra-fine wires and micro-tubes. Background Technology

[0002] Welding between pipes and wires is divided into two types: external welding and internal welding (also known as blind welding). External welding is generally simpler to perform because the welding position is visible (e.g., ...). Figure 1 As shown in the image, the welding dimensions and quality are intuitively controllable, and various welding processes are available, including laser welding, soldering, and resistance welding. However, welding inside pipes is not possible because the welding position is not visible (e.g., ...). Figure 2 (As shown), therefore, welding dimensions and welding quality are difficult to control.

[0003] Current technologies primarily rely on manual welding, with processes mainly consisting of manual soldering and semi-automatic resistance welding. This is especially true for welding ultra-fine wires with diameters below 0.5mm and micro-tubes with diameters below 5mm. The thinner the wire, the worse its straightness, making it more difficult to align with the internal dimensions of the tube, thus increasing the operational complexity. Therefore, automating internal tube welding has always been a technical challenge. The main drawbacks of the two current internal tube welding processes are: both require manual assembly of the tubular workpiece and the wire before welding, resulting in high operational difficulty, demanding skilled workers, a high risk of damage or deformation to the tubular workpiece and wire during the process, difficulty in controlling dimensional accuracy and welding quality, and low production efficiency. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects of the prior art by providing an automatic welding device and welding method for blind welding of ultrafine wires and micro-tubes.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] In one aspect, this invention provides an automated welding device for blind soldering of ultrafine wires and microtubes, comprising:

[0007] The wire feeding unit located on the welding platform includes a lead clamp for clamping the wire movement, a wire guide clamp for supporting the wire, and a servo motor located below the lead clamp to drive the lead clamp forward.

[0008] The tubular workpiece feeding unit, located next to the wire pushing unit, includes a feeding platform for placing the tubular workpiece, a feeding mechanism for conveying the tubular workpiece to the feeding platform, and a feeding platform cylinder for controlling the forward movement of the feeding platform.

[0009] And a welding unit for welding wires and tubular workpieces and located at the front end of the wire moving direction, which includes an upper spot welding electrode and a lower spot welding electrode;

[0010] During operation, the servo motor controls the lead clamp to move forward to the welding position. At this time, the lead wire head passes through the lead clamp and reaches the top of the lower spot welding electrode. The loading platform cylinder controls the loading platform to move forward, put the tubular workpiece on the lower spot welding electrode and stick it to the lead wire. The upper spot welding electrode moves downward to stick to the tubular workpiece and form a circuit with the lower spot welding electrode to perform welding.

[0011] Furthermore, the lead clamp and the wire guide clamp are kept horizontal, the wire guide clamp is fixed on the welding platform and remains stationary, and the lead clamp is movable. Since the wire is thin and flexible, the wire guide clamp mainly serves to support the wire.

[0012] Furthermore, the wire feeding unit also includes a vision sensor for capturing the wire head and a vision display screen connected to the vision sensor. The vision sensor is located on the welding platform, and the vision display screen is located next to the vision sensor.

[0013] Furthermore, the vision sensor controls the operation and stop of the servo motor through a preset program. The vision sensor can control the operation of the servo motor by preset the position where the wire head should be placed. When the welding position is reached, the servo motor stops, and the servo motor controls the lead clamp to move forward.

[0014] Furthermore, the feeding mechanism includes a vibratory feeder and a linear vibrator connected to the vibratory feeder for conveying tubular workpieces. The vibratory feeder conveys the tubular workpieces to the linear vibrator, and the linear vibrator conveys the tubular workpieces to the loading platform. The vibratory feeder can load tubular workpieces pre-stored at the bottom of the vibratory feeder, and the linear vibrator conveys the tubular workpieces to the loading platform.

[0015] Furthermore, the welding unit also includes a welding head, which is connected to and located above the upper spot welding electrode, and the welding head controls the upper spot welding electrode to move downward.

[0016] Furthermore, the welding unit also includes a pressure sensor located below the lower spot welding electrode. After the pressure sensor detects that the pressure on the lower spot welding electrode meets the standard, it controls the upper spot welding electrode to connect the welding circuit with the lower spot welding electrode. The pressure sensor has a preset pressure value, and the circuit is only connected to perform welding after the pressure value pressed down by the upper spot welding electrode meets the standard.

[0017] Furthermore, the welding platform is also equipped with a start button for activating the automatic welding device, which is used to activate the vision sensor to start the entire device.

[0018] Furthermore, a protective cover is provided on the outer edge of the welding platform. The protective cover protects the safety of relevant personnel and prevents injury from mechanical movement; at the same time, it protects the welding unit and prevents dust and other impurities from interfering with the welding unit.

[0019] The present invention also provides a welding method for an automatic welding device for blind welding of ultra-fine wires and micro-tubular workpieces, comprising the following steps:

[0020] S1: Place the wire into the lead clamp and wire pass-through clamp, with its head protruding from the wire pass-through clamp, and press the start button;

[0021] S2: The vision sensor captures the position of the wire head and controls the servo motor to run. The servo motor controls the lead clamp to the welding position, at which time the wire head is in close contact with the lower welding electrode.

[0022] S3: The tubular workpiece is conveyed to the loading platform via a vibratory feeder and then moved forward to the welding position by the cylinder of the loading platform. At this time, the tubular workpiece is placed on the lower spot welding electrode and is in close contact with the wire.

[0023] S4: The welding head controls the upper spot welding electrode to move downward and make close contact with the tubular workpiece. At this time, the pressure sensor detects the pressure value of the upper spot welding electrode pressing down. After the preset pressure value is reached, the upper welding electrode connects the circuit to perform welding. After welding is completed, all mechanisms retract and the welded wire and tubular workpiece are taken out.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] (1) This invention utilizes a vision sensor in conjunction with a servo motor to automatically capture the connection between the wire head and the tubular workpiece, confirm the starting point of the action, ensure the accuracy of the subsequent welding dimensions, and realize the basis of automatic welding.

[0026] (2) This invention utilizes a vibratory feeder automatic feeding structure to deliver the tubular workpiece to the feeding platform. With the help of wire guide clamps, the wire is automatically threaded into the tubular workpiece. This ensures that the wire is in the middle position of the tubular workpiece, achieves overall automation, and avoids damage or deformation to the tubular workpiece during the production process.

[0027] (3) The present invention utilizes the welding head to control the downward stroke and time of the upper spot welding electrode, which realizes automatic welding and ensures the controllability of welding time and pressure.

[0028] (4) The present invention utilizes a pressure sensor to monitor and store the output pressure range during welding in real time, which ensures both welding quality and traceability. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of external pipe welding in existing technology.

[0030] Figure 2 This is a schematic diagram of welding inside a pipe in the existing technology.

[0031] Figure 3 This is a schematic diagram of the automatic welding device of the present invention.

[0032] Figure 4 for Figure 3 A detailed schematic diagram of part A in the image.

[0033] Figure 5 for Figure 4 A detailed schematic diagram of part B in the image.

[0034] Figure 6 This is a detailed schematic diagram of the pressure sensor in the automatic welding device of the present invention.

[0035] Numbering on the map:

[0036] 1-Vision display screen, 2-Vision sensor, 3-Vibratory feeder, 4-Direct vibration, 5-Welding head, 6-Pressure sensor, 7-Feeding platform, 8-Start button, 9-Protective cover, 10-Lead wire clamp, 11-Servo motor, 12-Feeding platform cylinder, 13-Wire, 14-Wire clamp, 15-Lower spot welding electrode, 16-Upper spot welding electrode, 17-Workpiece. Detailed Implementation

[0037] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0038] Unless otherwise specified, the functional components or structures in the following embodiments or examples are conventional components or structures used in the art to achieve the corresponding functions.

[0039] To achieve automated welding of tubular workpieces and wires within tubular workpieces, this invention provides an automated welding device for blind welding of ultrafine wires and micro-tubular workpieces. The structure of this device can be found in [reference needed]. Figures 3 to 6 As shown, it includes:

[0040] The wire feeding unit located on the welding platform includes a lead clamp 10 for clamping and moving the wire 13, a wire passer 14 for supporting the wire 13, and a servo motor 11 located below the lead clamp 10 to drive the lead clamp 10 forward.

[0041] The tubular workpiece feeding unit located next to the wire pushing unit includes a feeding platform 7 for placing the tubular workpiece 17, a feeding mechanism for conveying the tubular workpiece 17 to the feeding platform 7, and a feeding platform cylinder 12 for controlling the forward movement of the feeding platform 7.

[0042] And a welding unit for welding wires and tubular workpieces and located at the front end of the moving direction of the wire 13, which includes an upper spot welding electrode 16 and a lower spot welding electrode 15.

[0043] During operation, the servo motor 11 controls the lead wire clamp 10 to move forward to the welding position. At this time, the head of the lead wire 13 passes through the wire clamp 14 and reaches above the lower spot welding electrode 15. The loading platform cylinder 12 controls the loading platform 7 to move forward and put the tubular workpiece 17 on the lower spot welding electrode 15 and stick it to the lead wire. The upper spot welding electrode 16 moves downward to stick to the tubular workpiece 17 and form a circuit with the lower spot welding electrode 15 for welding.

[0044] Because the conductor 13 is thin and flexible, a wire clamp 14 is needed to support it. In order for the conductor 13 to be placed horizontally on the lead platform 10 and the wire clamp 14, please refer to [the specific implementation details] for further information. Figure 3 and Figure 4 As shown, the lead clamp 10 and the wire passer 14 are kept horizontal, the wire passer 14 is fixed on the welding platform and remains stationary, and the lead clamp 10 is movable.

[0045] To clearly capture the position of the conductor head, a vision sensor 2 is used to capture the specific position of the conductor 13, unlike other ordinary mechanical devices. This vision sensor 2 stores the specific conductor position internally. After capturing an image, the vision sensor compares it with a reference image stored in memory for analysis. For some specific implementations, please refer to [link to relevant documentation]. Figure 3 and Figure 4 As shown, the wire feeding unit also includes a vision sensor 2 for capturing the head of the wire and a vision display screen 1 connected to the vision sensor 2. The vision sensor 2 is located on the welding platform and the vision display screen 1 is located next to the vision sensor 2.

[0046] For more detailed implementation methods, please refer to [link / reference]. Figure 3 and Figure 4 As shown, the vision sensor 2 controls the servo motor 11 to run and stop through a preset program.

[0047] To ensure more precise and automated feeding of the tubular workpiece 17, a vibratory feeder 3 and a linear vibrator 4 are configured. For some specific implementation details, please refer to [link / reference needed]. Figure 3 and Figure 4 As shown, the feeding mechanism includes a vibratory feeder 3 and a linear vibrator 4 connected to the vibratory feeder 3 for conveying the tubular workpiece 17. The vibratory feeder 3 conveys the tubular workpiece 17 into the linear vibrator 4, and the linear vibrator 4 conveys the tubular workpiece 17 above the loading platform 7.

[0048] For some specific implementation methods, please refer to [link / reference]. Figure 3 and Figure 5 As shown, the welding unit also includes a welding head 5, which is connected to and located above the upper spot welding electrode 16. The welding head 5 controls the upper spot welding electrode 16 to move downward.

[0049] Considering the precision of welding and how automated welding can automate the product, setting up pressure sensor 6 allows each welding process to be programmed and precise.

[0050] For some specific implementation methods, please refer to [link / reference]. Figure 3 and Figure 6 As shown, the welding unit also includes a pressure sensor 6 located below the lower spot welding electrode 15. After the pressure sensor 6 detects that the pressure on the lower spot welding electrode 15 meets the standard, it controls the upper spot welding electrode 16 to connect the welding circuit with the lower spot welding electrode 15.

[0051] For some specific implementation methods, please refer to [link / reference]. Figure 3 As shown, the welding platform is also equipped with a start button 8 for starting the automatic welding device.

[0052] Considering that the welding platform needs to be equipped with relevant protective measures, it is also to protect personnel from injury.

[0053] For some specific implementation methods, please refer to [link / reference]. Figure 3 As shown, a protective cover 9 is also provided on the outer edge of the welding platform. The protective cover 9 protects relevant personnel and welding units. This setting is to protect relevant personnel from mechanical injury and to protect the welding platform.

[0054] The present invention also provides a welding method for the device, comprising the following steps:

[0055] S1: Place the wire 13 into the lead clamp 10 and the wire clamp 14, with its head protruding from the wire clamp 14, and press the start button 8;

[0056] S2: The vision sensor 2 captures the position of the head of the wire 13 and controls the servo motor 11 to run. The servo motor 11 controls the lead clamp 10 to the welding position, at which time the head of the wire is in close contact with the lower spot welding electrode 15.

[0057] S3: The tubular workpiece 17 on the vibratory plate 3 is conveyed to the loading platform 7 by the direct vibration 4. The loading platform cylinder 12 controls the loading platform 7 to move forward to the welding position. At this time, the tubular workpiece 17 is sleeved on the lower spot welding electrode 15 and is in close contact with the wire 13.

[0058] S4: The welding head 5 controls the upper spot welding electrode 16 to move downward and fit tightly against the tubular workpiece 17. At this time, the pressure sensor 6 detects the pressure value of the upper spot welding electrode 16 pressing down. After the preset pressure value is reached, the upper welding electrode 13 connects the circuit to perform welding. After welding is completed, all mechanisms retract and the welded wire 13 and tubular workpiece 17 are taken out.

[0059] Each of the above implementation methods can be implemented individually, or in any combination of two or more.

[0060] The above implementation methods will be described in more detail below with reference to specific embodiments.

[0061] Example 1

[0062] To enable automated welding of tubular workpieces and wires within tubular workpieces, this embodiment provides an automated welding device for blind welding of ultra-fine wires to micro-tubular workpieces. The structure of this device can be found in [reference needed]. Figures 3 to 6 As shown, it includes:

[0063] The wire feeding unit located on the welding platform includes a lead clamp 10 for clamping and moving the wire 13, a wire passer 14 for supporting the wire 13, and a servo motor 11 located below the lead clamp 10 to drive the lead clamp 10 forward.

[0064] The tubular workpiece feeding unit located next to the wire pushing unit includes a feeding platform 7 for placing the tubular workpiece 17, a feeding mechanism for conveying the tubular workpiece 17 to the feeding platform 7, and a feeding platform cylinder 12 for controlling the forward movement of the feeding platform 7.

[0065] And a welding unit for welding wires and tubular workpieces and located at the front end of the moving direction of the wire 13, which includes an upper spot welding electrode 16 and a lower spot welding electrode 15.

[0066] During operation, the servo motor 11 controls the lead wire clamp 10 to move forward to the welding position. At this time, the head of the wire 13 passes through the wire clamp 14 and reaches above the lower spot welding electrode 15. The loading platform cylinder 12 controls the loading platform 7 to move forward and put the tubular workpiece 17 on the lower spot welding electrode 15 and stick it to the wire. The upper spot welding electrode 16 moves downward to stick to the tubular workpiece 17 and form a circuit with the lower spot welding electrode 15 to perform welding.

[0067] Please see again. Figure 3 and Figure 4 As shown, the lead clamp 10 and the wire clamp 14 are kept horizontal. The wire clamp 14 is fixed on the welding platform and remains stationary. The lead clamp 10 is movable. Since the wire 13 is thin and flexible, the wire clamp 14 is required to support the wire. In order to allow the wire 13 to be placed horizontally on the lead platform 10 and the wire clamp 14.

[0068] Please see again. Figure 3 and Figure 4 As shown, the wire feeding unit also includes a vision sensor 2 for capturing the wire head and a vision display screen 1 connected to the vision sensor 2. The vision sensor 2 is located on the welding platform, and the vision display screen 1 is located next to the vision sensor 2. In order to clearly capture the position of the wire head, compared with other ordinary mechanical devices, the vision sensor 2 is set to capture the specific position of the wire 13. The vision sensor 2 stores the specific wire position internally. After capturing the image, the vision sensor compares it with the reference image stored in memory to make analysis.

[0069] Please see again. Figure 3 and Figure 4 As shown, the vision sensor 2 controls the servo motor 11 to run and stop through a preset program.

[0070] Please see again. Figure 3 and Figure 4 As shown, the feeding mechanism includes a vibratory feeder 3 and a linear vibrator 4 connected to the vibratory feeder 3 for conveying the tubular workpiece 17. The vibratory feeder 3 conveys the tubular workpiece 17 into the linear vibrator 4, and the linear vibrator 4 conveys the tubular workpiece 17 above the loading platform 7. The vibratory feeder 3 and the linear vibrator 4 are set up to ensure that the tubular workpiece 17 is fed more accurately and automatically.

[0071] Please see again. Figure 3 and Figure 5 As shown, the welding unit also includes a welding head 5, which is connected to and located above the upper spot welding electrode 16. The welding head 5 controls the upper spot welding electrode 16 to move downward.

[0072] Please see again. Figure 3 and Figure 6 As shown, the welding unit also includes a pressure sensor 6 located below the lower spot welding electrode 15. After the pressure sensor 6 detects that the pressure on the lower spot welding electrode 15 meets the standard, it controls the upper spot welding electrode 16 to connect the welding circuit with the lower spot welding electrode 15. In order to make the welding more precise and to achieve product automation through automatic welding, the pressure sensor 6 is set up to make each welding process programmatic and precise.

[0073] Please see again. Figure 3 As shown, the welding platform is also equipped with a start button 8 for starting the automatic welding device.

[0074] Please see again. Figure 3 As shown, a protective cover 9 is also provided on the outer edge of the welding platform. The protective cover 9 protects the relevant personnel and welding unit. This setting is to protect the relevant personnel from mechanical injury and to protect the welding platform.

[0075] This embodiment also provides a welding method for the device, including the following steps:

[0076] S1: Place the wire 13 into the lead clamp 10 and the wire clip 14, with its head protruding from the wire clip 14, and press the start button 8;

[0077] S2: The vision sensor 2 captures the position of the head of the wire 13 and controls the servo motor 11 to run. The servo motor 11 controls the lead clamp 10 to the welding position, at which time the head of the wire is in close contact with the lower spot welding electrode 15.

[0078] S3: The tubular workpiece 17 on the vibratory plate 3 is conveyed to the loading platform 7 by the direct vibration 4. The loading platform cylinder 12 controls the loading platform 7 to move forward to the welding position. At this time, the tubular workpiece 17 is sleeved on the lower spot welding electrode 15 and is in close contact with the wire 13.

[0079] S4: The welding head 5 controls the upper spot welding electrode 16 to move downward and fit tightly against the tubular workpiece 17. At this time, the pressure sensor 6 detects the pressure value of the upper spot welding electrode 16 pressing down. After the preset pressure value is reached, the upper welding electrode 16 controls and connects the circuit to perform welding. After welding is completed, all mechanisms retract and the welded wire 13 and tubular workpiece 17 are taken out.

[0080] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. An automatic welding device for blind welding of ultra-fine wires and micro-tubes, characterized in that, include: The wire feeding unit located on the welding platform includes a movable lead clamp (10) for clamping the wire (13), a wire clamp (14) for supporting the wire (13), and a servo motor (11) located below the lead clamp (10) to drive the lead clamp (10) forward. The tubular workpiece feeding unit located next to the wire pushing unit includes a feeding platform (7) for placing the tubular workpiece (17), a feeding mechanism for conveying the tubular workpiece (17) to the feeding platform (7), and a feeding platform cylinder (12) for controlling the forward movement of the feeding platform (7). And a welding unit for welding wire (13) and tubular workpiece (17) and located at the front end of the moving direction of wire (13), which includes an upper spot welding electrode (16) and a lower spot welding electrode (15). During operation, the servo motor (11) controls the lead clamp (10) to move forward to the welding position. At this time, the head of the wire (13) passes through the wire clamp (14) and reaches above the lower spot welding electrode (15). The loading platform cylinder (12) controls the loading platform (7) to move forward and put the tubular workpiece (17) on the lower spot welding electrode (15) and stick it to the wire (13). The upper spot welding electrode (16) moves downward to stick to the tubular workpiece (17) and forms a circuit with the lower spot welding electrode (15) to perform welding.

2. The automatic welding device for blind welding of ultrafine wires and micro-tubes according to claim 1, characterized in that, The lead clamp (10) and the wire clamp (14) are kept horizontal. The wire clamp (14) is fixed on the welding platform and remains stationary. The lead clamp (10) is movable.

3. The automatic welding device for blind welding of ultra-fine wires and micro-tubes according to claim 1, characterized in that, The wire feeding unit also includes a vision sensor (2) for capturing the position of the head of the wire (13) and a vision display screen (1) connected to the vision sensor (2). The vision sensor (2) is located on the welding platform and the vision display screen (1) is located next to the vision sensor (2).

4. An automatic welding device for blind welding of ultrafine wires and micro-tubes according to claim 3, characterized in that, The vision sensor (2) controls the servo motor (11) to run and stop through a preset program.

5. An automatic welding device for blind welding of ultrafine wires and micro-tubes according to claim 4, characterized in that, The feeding mechanism includes a vibratory plate (3) and a linear vibrator (4) connected to the vibratory plate (3) for conveying the tubular workpiece (17). The vibratory plate (3) conveys the tubular workpiece (17) into the linear vibrator (4), and the linear vibrator (4) conveys the tubular workpiece (17) above the loading platform (7).

6. An automatic welding device for blind welding of ultrafine wires and micro-tubes according to claim 5, characterized in that, The welding unit also includes a welding head (5), which is connected to and located above the upper spot welding electrode (16). The welding head (5) controls the upper spot welding electrode (16) to move downward.

7. An automatic welding device for blind welding of ultrafine wires and micro-tubes according to claim 6, characterized in that, The welding unit also includes a pressure sensor (6) located below the lower spot welding electrode (15). After the pressure sensor (6) detects that the pressure on the lower spot welding electrode (15) meets the standard, it controls the upper spot welding electrode (16) to connect the welding circuit with the lower spot welding electrode (15).

8. An automatic welding device for blind welding of ultrafine wires and micro-tubes according to claim 7, characterized in that, The welding platform is also equipped with a start button (8) for activating the automatic welding device.

9. An automatic welding device for blind welding of ultrafine wires and micro-tubes according to claim 1, characterized in that, The outer edge of the welding platform is also provided with a protective cover (9), which is used to protect the safety of relevant personnel and the welding unit.

10. The welding method of the automatic welding device for blind welding of ultrafine wires and micro-tubes as described in claim 8, characterized in that, Includes the following steps: S1: Place the wire (13) into the lead clamp (10) and the wire clamp (14), with the head of the wire protruding from the wire clamp (14), and press the start button (8). S2: The vision sensor (2) captures the position of the head of the wire (13) and controls the servo motor (11) to run. The servo motor (11) controls the lead clamp (10) to the welding position. At this time, the head of the wire is in close contact with the lower spot welding electrode (15). S3: The tubular workpiece (17) is placed on the vibratory plate (3) and conveyed to the loading platform (7) by the direct vibration (4). The loading platform cylinder (12) controls the loading platform (7) to move forward to the welding position. At this time, the tubular workpiece (17) is placed on the lower spot welding electrode (15) and is in close contact with the wire (13). S4: The welding head (5) controls the upper spot welding electrode (16) to move downward and fit closely with the tubular workpiece (17). At this time, the pressure sensor (6) detects the pressure value of the upper spot welding electrode (16) pressing down. After reaching the preset pressure value, the upper spot welding electrode (16) connects the circuit to perform welding. After welding is completed, each mechanism retracts and the welded wire (13) and tubular workpiece (17) are taken out.

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