Semi-automatic flange welding machine and welding method thereof

Abstract

The invention relates to the technical field of mechanical engineering and welding automation, and discloses a semi-automatic flange welding machine and a welding method thereof.The semi-automatic flange welding machine comprises a bottom plate, a plurality of adjusting mechanisms are fixedly installed on one side of the upper portion of the bottom plate, and each adjusting mechanism comprises a main body assembly and an adjusting assembly and is used for adjusting the position and angle of a welding device; a conveying mechanism is arranged on one side of the outer portion of the bottom plate and used for welding a flange, a fixing and clamping mechanism is fixedly installed on the other side of the upper portion of the bottom plate, the fixing and clamping mechanism comprises a driving assembly and a fixing and clamping assembly and used for clamping and fixing the flange, and a Siemens PLC is arranged at one end of the bottom plate. And an electric box is arranged at the other end of the bottom plate. Through cooperative control of a Siemens PLC and a Weilutong touch screen, automatic linkage of welding gun transverse swinging, wire feeding and rotary table rotating is achieved, an operator only needs to complete flange bottoming and clamping, the device can automatically execute filling welding, and the welding efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical engineering and welding automation, and in particular to a semi-automatic flange welding machine and a welding method thereof. Background Art

[0002] In the field of mechanical engineering and welding automation technology, flanges are key components for pipe connections, and their welding quality and efficiency directly affect the safety and reliability of industrial equipment. The traditional manual welding method of flanges has significant shortcomings: On the one hand, the welding process is highly dependent on the experience of the argon arc welder, the quality of the weld formation is unstable, and defects such as porosity, lack of fusion, and large weld width errors are prone to occur. It also requires high technical skills from the welder and has high labor costs. On the other hand, manual operation requires frequent adjustments to the welding gun position and wire feeding speed, especially for flanges of different specifications. The changeover time is long, and it is difficult to meet the efficiency requirements of small and medium-sized batch production. In addition, most of the existing semi-automatic equipment is single-axis controlled, and it is impossible to achieve multi-axis linkage of welding gun swaying, wire feeding, and turntable rotation. It is difficult to adapt to the welding needs of complex grooves, resulting in poor weld uniformity and a large workload for subsequent grinding.

[0003] In view of this, an object of the present invention is to provide a semi-automatic flange welding machine and a welding method thereof to solve the deficiencies in the prior art. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides a semi-automatic flange welding machine and a welding method thereof, which solves the problem of low welding efficiency of traditional devices.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a semi-automatic flange welding machine, comprising a base plate, a plurality of adjustment mechanisms fixedly installed on one side of the upper portion of the base plate, the adjustment mechanism comprising a main body assembly and an adjustment assembly, which is used to adjust the position and angle of the welding device, a conveying mechanism is provided on one side of the outer portion of the base plate, which is used to weld the flange, a fixed clamping mechanism is fixedly installed on the other side of the upper portion of the base plate, the fixed clamping mechanism comprising a driving assembly and a fixed clamping assembly, which is used to clamp and fix the flange, a Siemens PLC is provided at one end of the base plate, and an electrical box is provided at the other end of the base plate.

[0006] Preferably, the main body component in the adjustment mechanism includes a plurality of fixed plates fixedly mounted on one side of the upper portion of the base plate, wherein a connecting block is fixedly mounted between two of the fixed plates, and a sliding block is fixedly mounted on the upper portion of the connecting block.

[0007] Preferably, the adjustment assembly includes a motor 1 fixedly mounted on the inner side of one of the fixed plates, the output end of the motor 1 is fixedly connected to one end of a threaded rod, the other end of the threaded rod is threadedly connected to the inner side of another fixed plate, the outer side of the threaded rod is threadedly connected to an adjustment block, and the adjustment block is slidably connected to the upper part of the slider.

[0008] Preferably, two 57 step slides 1 are provided on one side of the upper portion of the base plate, and a 57 step slide 2 is fixedly installed on the upper portion of the adjustment block of the two 57 step slides 1, and a 57 step slide 2 is also fixedly installed on one side of the adjustment block of the two 57 step slides 2.

[0009] Preferably, the conveying mechanism includes a 57-step wire feeder arranged on the outer side of the base plate, the 57-step wire feeder is wound with a wire feeding tube assembly, and a fixed seat is fixedly installed on one side of the adjustment block of the 57-step slide two, and a welding gun is fixedly connected to one side of the fixed seat, and one end of the wire feeding tube assembly is connected to the welding gun.

[0010] Preferably, the driving assembly in the fixed clamping mechanism includes a support block fixedly mounted on the other side of the upper portion of the base plate, a motor 2 is fixedly mounted on the other side of the upper portion of the base plate, an output end of the motor 2 is fixedly connected to an 86-stepping turntable, a protective ring is provided on the edge of the outer surface of the 86-stepping turntable, and telescopic rods are fixedly mounted on both sides of the inside of the protective ring.

[0011] Preferably, the fixed clamping assembly includes clamping plates fixedly connected to the output ends of the two telescopic rods, rubber pads are provided on the inner sides of the two clamping plates, pressure sensors are provided at one end of the two clamping plates, and a centering shaft is fixedly installed at the center of the outer surface of the 86-step turntable.

[0012] Preferably, a guardrail is provided on one side of the fixed clamping mechanism.

[0013] Preferably, a plurality of Weiluntong touch control screens are provided on the upper portion of the Siemens PLC, and a plurality of buttons are also provided on the upper portion of the Siemens PLC.

[0014] In addition, the present invention also provides a welding method of a semi-automatic flange welding machine, comprising the following steps: S1: Insert the primed flange into the centering shaft of the fixed clamping mechanism. Coaxial positioning is achieved through the clearance between the inner hole of the flange and the centering shaft. Then start motor 2 to drive the stepping turntable. The clamping plates are pushed through the telescopic rods on both sides to clamp the outer periphery of the flange. The rubber pads provide anti-slip friction, and the pressure sensor monitors the clamping force in real time to avoid over-tightening and deformation.

[0015] S2: Select the flange specifications through the Weiluntong touch screen, and the Siemens PLC drives the adjustment mechanism's two 600mm57 stepper slides (first) and three 300mm57 stepper slides (second) to move: Yaw amplitude adjustment: Motor 1 drives the threaded rod to rotate, driving the adjustment block to slide on the slider to set the yaw distance.

[0016] Three-dimensional positioning: Stepper slide 2 controls the vertical height, front-to-back distance and angle of the welding gun respectively.

[0017] Set the welding parameters on the Weiluntong touch control screen: wire feeding speed 3-6m / min, turntable speed 0.1-10r / min, yaw speed 20-50mm / s, pre-melting time 0.5-2s.

[0018] S3: The stepper wire feeder pre-feeds the wire through the wire feeding tube assembly. At the same time, the stepper slide drives the welding gun to swing horizontally along the X-axis, and the stepper turntable drives the flange to rotate to form a spiral welding track.

[0019] The present invention provides a semi-automatic flange welding machine and a welding method thereof. It has the following beneficial effects: 1. The present invention realizes the automated linkage of welding gun oscillation, wire feeding, and turntable rotation through the coordinated control of Siemens PLC and Weiluntong touch screen. The operator only needs to complete flange priming and clamping, and the equipment can automatically perform filler welding, thereby improving welding efficiency. At the same time, the precise control of the multi-axis stepping slide ensures the stability of the welding gun trajectory. The oscillation amplitude and wire feeding speed can accurately match the welding process, so that the weld width error is ≤±1mm and the penetration depth is ≥3mm, which significantly improves the consistency of welding quality and reduces weld defects caused by manual operation.

[0020] 2. The present invention supports manual adjustment of parameters such as yaw speed, yaw distance, wire feeding speed, and turntable speed through the equipment, and can store welding parameters of different flange specifications through the touch screen. Combined with the modular design of the centering shaft and the clamping plate, the changeover time is ≤ 5 minutes, which effectively meets the welding needs of multiple specifications of flanges in small and medium-sized batch production, and avoids the problem of insufficient production flexibility caused by differences in welder skills in traditional manual welding.

[0021] 3. The present invention uses an automated welding process, and the equipment can be operated by operators with no argon arc welding experience. High-quality welding can be completed without professional welders, which significantly saves the number of argon arc welders. At the same time, the flange clamping adopts centering shaft positioning and automatic clamping of the clamping plate, combined with the safety protection design of the travel switch and pressure sensor, reducing manual adjustment time and operation risks, realizing an efficient production mode of "human-machine collaboration", and is suitable for cost optimization in labor-intensive manufacturing scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is the left schematic diagram of the present invention; Figure 2 It is a right schematic diagram of the present invention; Figure 3It is a schematic diagram of the adjustment mechanism of the present invention; Figure 4 This is a schematic diagram of the second stepping slide of the present invention; Figure 5 It is a schematic diagram of the conveying mechanism of the present invention; Figure 6 is a schematic diagram of a drive assembly of the present invention; Figure 7 is a schematic diagram of a fixed clamping assembly of the present invention; Figure 8 Schematic diagram of the control structure of the present invention.

[0023] Among them, 1. Base plate; 2. Adjustment mechanism; 200, 57 stepper slide 1; 201. Fixed plate; 202. Connecting block; 203. Slider; 204. Motor 1; 205. Threaded rod; 206. Adjustment block; 207, 57 stepper slide 2; 3. Conveying mechanism; 301, 57 stepper wire feeder; 302. Wire feed tube assembly; 303. Fixed seat; 304. Welding gun; 4. Fixed clamping mechanism; 400, Support block; 401. Motor 2; 402, 86 stepper turntable; 403. Protective ring; 404. Centering shaft; 405. Telescopic rod; 406. Clamping plate; 407. Rubber pad; 408. Pressure sensor; 5. Electrical box; 6. Guardrail; 7. Siemens PLC; 8. Weiluntong touch control screen; 9. Button. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the present specification. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Please see the attached Figure 1 -Attached Figure 8 An embodiment of the present invention provides a semi-automatic flange welding machine, comprising a base plate 1, a plurality of adjustment mechanisms 2 are fixedly mounted on one side of the upper portion of the base plate 1, the adjustment mechanism 2 comprises a main body assembly and an adjustment assembly, which is used to adjust the position and angle of the welding device, a conveying mechanism 3 is provided on one side of the outer portion of the base plate 1, which is used to weld the flange, a fixed clamping mechanism 4 is fixedly mounted on the other side of the upper portion of the base plate 1, the fixed clamping mechanism 4 comprises a driving assembly and a fixed clamping assembly, which is used to clamp and fix the flange, a Siemens PLC 7 is provided at one end of the base plate 1, and an electrical box 5 is provided at the other end of the base plate 1.

[0026] The main assembly of the adjustment mechanism 2 includes a plurality of fixed plates 201 fixedly mounted on one side of the upper portion of the base plate 1, wherein a connecting block 202 is fixedly mounted between two fixed plates 201, and a slider 203 is fixedly mounted on the upper portion of the connecting block 202; Specifically, the two fixing plates 201 are fixed by a connecting block 202 , and the adjusting block 206 is fixedly mounted with a slider 203 on the upper portion of the connecting block 202 for sliding.

[0027] The adjustment assembly includes a motor 204 fixedly mounted on the inner side of a fixed plate 201. The output end of the motor 204 is fixedly connected to one end of a threaded rod 205. The other end of the threaded rod 205 is threadedly connected to the inner side of another fixed plate 201. The outer side of the threaded rod 205 is threadedly connected to an adjustment block 206. The adjustment block 206 is slidably connected to the upper part of the slider 203. Specifically, the motor 1 204 drives the threaded rod 205 to rotate, driving the adjustment block 206 to slide on the slider 203 to adjust the horizontal swing amplitude of the welding gun; the two 57 step slides 1 200 carry the three 57 step slides 2 207 through the adjustment block 206.

[0028] Two 57 step slides 200 are provided on one side of the upper part of the bottom plate 1. The upper part of the adjustment block 206 of the two 57 step slides 200 is fixedly installed with a 57 step slide 207. One side of the adjustment block 206 of the two 57 step slides 207 is also fixedly installed with a 57 step slide 207. Specifically, two 57 step slides 200 are provided on one side of the upper part of the base plate 1. The two 57 step slides 200 are arranged parallel to each other, and the upper part of their adjustment blocks 206 is fixedly mounted with a 57 step slide 207. The 57 step slide 200 is mainly used to realize the horizontal movement of the welding device. It is driven by a stepper motor and can accurately control the position of the welding device. The 57 step slide 207 is installed on the upper part of the adjustment block 206 of the 57 step slide 200, which can further realize the fine adjustment of the welding device in the vertical direction and the angular direction. The 57 step slide 207 is also fixedly mounted on one side of the adjustment block 206 of the two 57 step slides 207, so that the welding device can be flexibly adjusted in multiple directions, thereby meeting the needs of different welding processes.

[0029] The conveying mechanism 3 includes a 57-step wire feeder 301 arranged on one side of the outside of the base plate 1. The 57-step wire feeder 301 is wound with a wire feeding tube assembly 302. A fixing seat 303 is fixedly installed on one side of the adjustment block 206 of a 57-step slide 207. A welding gun 304 is fixedly connected to one side of the fixing seat 303. One end of the wire feeding tube assembly 302 is connected to the welding gun 304. Specifically, the 57-stepping wire feeder 301 of the conveying mechanism 3 is located on the exterior side of the base plate 1 and is connected to the welding gun 304 via the wire feed tube assembly 302. The 57-stepping wire feeder 301 delivers the welding wire to the welding gun 304 at a set speed and length. A fixing base 303 is fixedly mounted on one side of the adjustment block 206 of the 57-stepping slide 207. The fixing base 303 securely secures the welding gun 304 to the adjustment block 206, allowing precise position adjustment of the welding gun 304 as the adjustment block 206 moves. The welding gun 304 is used to weld flanges.

[0030] The driving assembly in the fixed clamping mechanism 4 includes a support block 400 fixedly mounted on the other side of the upper portion of the base plate 1. A second motor 401 is fixedly mounted on the other side of the upper portion of the base plate 1. The output end of the second motor 401 is fixedly connected to an 86-stepping turntable 402. A protective ring 403 is provided on the outer edge of the 86-stepping turntable 402. Telescopic rods 405 are fixedly mounted on both sides of the inner portion of the protective ring 403. Specifically, the driving assembly of the fixed clamping mechanism 4 is located on the other side of the upper part of the base plate 1, and the motor 2 401 drives the 86 stepping turntable 402 to rotate. The output end of the motor 2 401 is fixedly connected to the 86 stepping turntable 402. When the motor 2 401 is started, it will drive the 86 stepping turntable 402 to rotate at a set speed. A protective ring 403 is provided on the outer surface edge of the 86 stepping turntable 402. The function of the protective ring 403 is to prevent the spatter and sparks generated during the welding process from damaging the turntable and other components. Telescopic rods 405 are fixedly installed on both sides of the interior of the protective ring 403. The function of the telescopic rod 405 is to push the clamping plate 406 toward the flange after the flange is installed in place, so as to clamp the flange.

[0031] The fixed clamping assembly includes a clamping plate 406 fixedly connected to the output ends of the two telescopic rods 405. The inner sides of the two clamping plates 406 are provided with a rubber pad 407. One end of the two clamping plates 406 is provided with a pressure sensor 408. A centering shaft 404 is fixedly installed at the center of the outer surface of the 86 stepping turntable 402. Specifically, the clamping plate 406 is fixedly connected to the output ends of the two telescopic rods 405. When the telescopic rods 405 are extended, the clamping plate 406 moves toward the flange, clamping the flange. A rubber pad 407 is provided on the inner side of the clamping plate 406. The function of the rubber pad 407 is to increase the friction between the clamping plate 406 and the flange, preventing the flange from slipping during the welding process. A pressure sensor 408 is provided at one end of the clamping plate 406. The function of the pressure sensor 408 is to monitor the clamping force of the clamping plate 406 on the flange in real time, ensuring that the clamping force is within the appropriate range. If the clamping force is too large or too small, the pressure sensor 408 will feedback the signal to the control system for timely adjustment. A centering shaft 404 is fixedly mounted at the center of the outer surface of the 86-step turntable 402. The function of the centering shaft 404 is to provide a precise positioning reference for the flange during installation, ensuring that the center of the flange coincides with the rotation center of the turntable.

[0032] A guardrail 6 is provided on each side of the fixed clamping mechanism 4; A plurality of Weiluntong touch control screens 8 are provided on the upper part of the Siemens PLC7, and a plurality of buttons 9 are also provided on the upper part of the Siemens PLC7; Specifically, a guardrail 6 is provided on one side of the fixed clamping mechanism 4. The function of the guardrail 6 is to provide safety protection for the operator and prevent the operator's body parts from coming into contact with the rotating turntable or other dangerous parts during the operation of the equipment. On the upper part of the Siemens PLC7, a plurality of Weiluntong touch control screens 8 are provided. The Weiluntong touch control screen 8 is the human-machine interaction interface of the equipment. The operator can input various welding parameters and control instructions by touching the icons and buttons 9 on the screen. The Weiluntong touch control screen 8 has an intuitive and convenient operation interface, which can display the operating status, welding parameters and fault information of the equipment in real time. The operator can start, stop, adjust parameters and other operations of the equipment by touching the corresponding buttons 9 on the screen according to actual needs. On the upper part of the Siemens PLC7, there are also a plurality of buttons 9. The operator can press these buttons 9 to perform emergency operations or manual adjustments to the equipment.

[0033] In addition, the present invention also provides a welding method of a semi-automatic flange welding machine, comprising the following steps: S1: Insert the primed flange into the centering shaft 404 of the fixed clamping mechanism 4, and achieve coaxial positioning through the clearance between the inner hole of the flange and the centering shaft 404. Then start the second motor 401 to drive the 86-step turntable 402. Push the clamping plate 406 through the telescopic rods 405 on both sides to clamp the outer periphery of the flange. The rubber pad 407 provides anti-slip friction. The pressure sensor 408 monitors the clamping force in real time to avoid over-tightening and deformation.

[0034] S2: Select the flange specifications through the Weiluntong touch control screen 8, and the Siemens PLC7 drives the two 600mm57 step slides 1 200 and the three 300mm57 step slides 2 207 of the adjustment mechanism 2: Yaw amplitude adjustment: Motor 1 204 drives the threaded rod 205 to rotate, driving the adjustment block 206 to slide on the slider 203 to set the yaw distance.

[0035] Three-dimensional positioning: 57 step slide 207 controls the vertical height, front-to-back distance and angle of the welding gun 304 respectively.

[0036] Set the welding parameters on the Weiluntong touch control screen 8: wire feeding speed 3-6m / min, turntable speed 0.1-10r / min, yaw speed 20-50mm / s, pre-melting time 0.5-2s.

[0037] S3: The 57-step wire feeder 301 pre-feeds the wire through the wire feeding tube assembly 302. At the same time, the two 57-step slides 200 drive the welding gun 304 to swing horizontally along the X-axis, and the 86-step turntable 402 drives the flange to rotate, forming a spiral welding trajectory.

[0038] Working principle: The equipment uses the base plate 1 as the supporting platform, and the core control system is composed of Siemens S7-200SMARTST30PLC7 and Weiluntong MT6103IP touch screen 8. The operator sets the parameters such as yaw speed, wire feeding speed, and turntable speed through the touch screen. The Siemens PLC7 converts the instructions into pulse signals to drive 6 MC556E stepper controllers, which respectively control the coordinated movement of two 600mm specification 57 stepper slides 1 200, three 300mm specification 57 stepper slides 207, one 86 stepper turntable 402 and one 57 stepper wire feeder 301.

[0039] Two fixed plates 201 are secured by connecting blocks 202. Motor 1 204 rotates threaded rods 205, driving adjustment blocks 206 to slide on sliders 203, enabling adjustment of the welding gun's lateral swing amplitude. Two 57-inch stepper slides 200, supported by adjustment blocks 206, support three 57-inch stepper slides 207, controlling the welding gun's 304's vertical height (Z-axis), front-to-back distance (Y-axis), and fine-tuning of the angle. Furthermore, a centering shaft 404 inserted into the flange's inner hole achieves coaxial positioning. Motor 2 401 rotates the 86-inch stepper turntable 402. Telescopic rods 405 on either side drive clamping plates 406 to clamp the flange via rubber pads 407. Pressure sensors 408 monitor the clamping force in real time, and protective rings 403 prevent splash damage to the turntable.

[0040] During welding, the 57-step wire feeder 301 feeds wire through the wire feed tube assembly 302 to the welding gun 304. Driven by two 57-step slides 200, the welding gun oscillates along the X-axis, coordinating with the rotation of the turntable to form a spiral welding trajectory. The oscillation amplitude is determined by the displacement of the adjustment block 206, such as 20mm on each side to achieve a total amplitude of 40mm. The frequency is controlled by the pulse frequency, such as 500Hz for a speed of 50mm / s. A three-dimensional positioning slide ensures that the welding gun nozzle is 3-5mm away from the weld seam and 5-10mm high, with the angle adapted to the groove requirements.

[0041] Through the above steps, the present invention realizes automatic oscillation, wire feeding and rotation of the welding gun, and the oscillation speed, oscillation distance, wire feeding speed, rotation speed and pre-melting time can be manually adjusted according to actual conditions, thereby reducing the workload of the welder, improving the welding speed and quality, and allowing people without argon arc welding skills to operate the equipment, saving the number of argon arc welders and improving welding efficiency.

[0042] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A semi-automatic flange welding machine, characterized in that, The invention comprises a base plate (1), wherein a plurality of adjustment mechanisms (2) are fixedly mounted on one side of the upper portion of the base plate (1), wherein the adjustment mechanism (2) comprises a main body component and an adjustment component, which is used to adjust the position and angle of the welding device; a conveying mechanism (3) is provided on one side of the outer portion of the base plate (1), which is used to weld the flange; a fixed clamping mechanism (4) is fixedly mounted on the other side of the upper portion of the base plate (1), wherein the fixed clamping mechanism (4) comprises a driving component and a fixed clamping component, which is used to clamp and fix the flange; a Siemens PLC (7) is provided on one end of the base plate (1), and an electrical box (5) is provided on the other end of the base plate (1).

2. A semi-automatic flange welding machine according to claim 1, characterized in that: The main assembly in the adjustment mechanism (2) comprises a plurality of fixed plates (201) fixedly mounted on one side of the upper portion of the base plate (1), wherein a connecting block (202) is fixedly mounted between two of the fixed plates (201), and a sliding block (203) is fixedly mounted on the upper portion of the connecting block (202).

3. A semi-automatic flange welding machine according to claim 2, characterized in that: The adjustment assembly comprises a motor 1 (204) fixedly mounted on the inner side of one of the fixing plates (201); an output end of the motor 1 (204) is fixedly connected to one end of a threaded rod (205); the other end of the threaded rod (205) is threadedly connected to the inner side of another fixing plate (201); an outer side of the threaded rod (205) is threadedly connected to an adjustment block (206); and the adjustment block (206) is slidably connected to the upper portion of the slider (203).

4. The semi-automatic flange welding machine according to claim 1, characterized in that: Two 57-step slides (200) are provided on one side of the upper portion of the base plate (1), and a 57-step slide (207) is fixedly installed on the upper portion of the adjustment block (206) of the two 57-step slides (200), and a 57-step slide (207) is also fixedly installed on one side of the adjustment block (206) of the two 57-step slides (207).

5. The semi-automatic flange welding machine according to claim 1, characterized in that: The conveying mechanism (3) includes a 57-step wire feeder (301) arranged on an outer side of the base plate (1), the 57-step wire feeder (301) is wound with a wire feeding tube assembly (302), a fixing seat (303) is fixedly installed on one side of the adjustment block (206) of the 57-step slide second (207), a welding gun (304) is fixedly connected to one side of the fixing seat (303), and one end of the wire feeding tube assembly (302) is connected to the welding gun (304).

6. The semi-automatic flange welding machine according to claim 1, characterized in that: The driving assembly in the fixed clamping mechanism (4) includes a support block (400) fixedly mounted on the other side of the upper portion of the base plate (1), a second motor (401) fixedly mounted on the other side of the upper portion of the base plate (1), an output end of the second motor (401) fixedly connected to an 86-stepping turntable (402), a protective ring (403) provided on the outer edge of the 86-stepping turntable (402), and telescopic rods (405) fixedly mounted on both sides of the interior of the protective ring (403).

7. The semi-automatic flange welding machine according to claim 6, characterized in that: The fixed clamping assembly includes a clamping plate (406) fixedly connected to the output ends of the two telescopic rods (405), a rubber pad (407) is provided on the inner side of the two clamping plates (406), a pressure sensor (408) is provided at one end of the two clamping plates (406), and a centering shaft (404) is fixedly installed at the center of the outer surface of the 86-stepping turntable (402).

8. The semi-automatic flange welding machine according to claim 1, characterized in that: A guardrail (6) is provided on one side of the fixed clamping mechanism (4).

9. The semi-automatic flange welding machine according to claim 1, characterized in that: A plurality of Weiluntong touch control screens (8) are provided on the upper portion of the Siemens PLC (7), and a plurality of buttons (9) are also provided on the upper portion of the Siemens PLC (7).

10. A welding method for a semi-automatic flange welding machine, applied to a semi-automatic flange welding machine according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Insert the flange after the primer into the centering shaft (404) of the fixed clamping mechanism (4), and realize coaxial positioning through the clearance between the inner hole of the flange and the centering shaft (404). Then start the second motor (401) to drive the 86-step turntable (402). Push the clamping plate (406) to clamp the outer periphery of the flange through the telescopic rods (405) on both sides. The rubber pad (407) provides anti-slip friction. The pressure sensor 408 monitors the clamping force in real time to avoid deformation due to over-tightening. S2: Select the flange specifications through the Weiluntong touch control screen (8), and the Siemens PLC7 drives the two 600mm57 step slides (200) and three 300mm57 step slides (207) of the adjustment mechanism (2) to move: Yaw amplitude adjustment: Motor 1 (204) drives the threaded rod (205) to rotate, driving the adjustment block (206) to slide on the slider (203) to set the yaw distance; Three-dimensional positioning: 57 step slide two (207) respectively controls the vertical height, front-back distance and angle of the welding gun (304); Set the welding parameters on the Weiluntong touch screen (8): wire feeding speed 3-6m / min, turntable speed 0.1-10r / min, yaw speed 20-50mm / s, pre-melting time 0.5-2s; S3: The 57-step wire feeder (301) pre-feeds the wire through the wire feeding tube assembly (302), while the two 57-step slides (200) drive the welding gun (304) to swing along the X-axis, and the 86-step turntable (402) drives the flange to rotate, forming a spiral welding trajectory.

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