Laser-arc hybrid welding device for oil pipeline

Abstract

The application discloses a laser electric arc composite welding device for petroleum pipelines, which comprises a portal frame, a driving unit and a welding unit. The portal frame is provided with a driving seat which slides and adjusts in the horizontal direction. One end of the driving unit is fixed to the driving seat. The welding unit is arranged on the driving unit and comprises two composite welding devices which are symmetrically distributed left and right. A roller device is arranged below the welding unit on one side of the portal frame. Two pipelines to be connected roll and are placed on the roller device.

Description

Technical Field

[0001] This invention belongs to the field of laser composite welding technology, specifically a laser-arc composite welding device for oil pipelines. Background Technology

[0002] Oil pipelines are typically characterized by high pressure and large diameter, placing extremely high demands on welding quality. Traditional single welding methods are insufficient in terms of penetration depth and width, easily leading to welding defects that affect the safe operation of the pipeline. Among existing technologies, laser-arc hybrid welding technology can effectively improve the mechanical properties and pressure resistance of the weld, ensuring the long-term safe operation of the pipeline under complex working conditions.

[0003] However, existing laser-arc hybrid welding devices typically employ single-pass straight welding, which has limited penetration depth and width. Especially in thick-walled or large-diameter oil pipelines, it cannot meet the requirements for high strength and pressure resistance. Furthermore, the structure of straight welds is relatively simple, making them prone to stress concentration under uneven stress or complex working conditions, thus affecting the long-term reliability of the welds. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a laser-arc hybrid welding device for oil pipelines, comprising: a gantry frame, a drive unit, and a welding unit;

[0005] The gantry is equipped with a drive seat that can be adjusted horizontally, and one end of the drive unit is fixed to the drive seat;

[0006] The welding unit is mounted on the drive unit, and the welding unit includes two composite welding devices symmetrically distributed on the left and right sides.

[0007] A roller support device is provided on one side of the gantry frame below the welding unit, and two docking pipes are rolled on the roller support device.

[0008] Furthermore, preferably, the driving unit includes:

[0009] The lifting beam is vertically fixed to one end face of the drive seat, and a movable beam that slides vertically along its surface is horizontally arranged on one side of the lifting beam.

[0010] The positioning seat is horizontally slidably mounted on the moving beam, and an upper crossbeam parallel to the moving beam is fixed to the upper end of the positioning seat.

[0011] A positioning plate is installed on the upper crossbeam. A vertically arranged machine plate is connected to the positioning plate by symmetrically arranged fixing frames. The welding unit is installed on the machine plate.

[0012] The control unit is mounted on the upper crossbeam.

[0013] Furthermore, as a preferred embodiment, a guide rail is fixed to one side of the upper crossbeam, the positioning plate is slidably connected to the guide rail, and a fine-tuning cylinder is installed on the upper crossbeam, the telescopic end of the fine-tuning cylinder being connected to the positioning plate.

[0014] A column is vertically slidably connected inside the positioning plate. The upper end of the column is fixed to the fixing frame. A lifting cylinder is installed below the positioning plate, and the output end of the lifting cylinder is connected to the column.

[0015] Furthermore, as a preferred embodiment, two machine bases are symmetrically mounted on the positioning plate, and a rotating shaft is rotatably connected inside the machine base. Each of the composite welding devices is fixed to one end of the rotating shaft.

[0016] Furthermore, preferably, the composite welding apparatus includes:

[0017] The machine casing has a connecting frame fixed on one side, and an arc welding device is installed on the connecting frame;

[0018] The central shaft is vertically fixed to the lower end face of the machine housing. A support is provided below the machine housing, and the central shaft is rotatably connected to the support through a bearing.

[0019] The laser welder is fixed at an angle to one end face of the support.

[0020] Furthermore, as a preferred embodiment, the arc welding device in each of the aforementioned composite welding devices is located on the left or right side of the oil pipeline weld.

[0021] The tilt angle of the laser welder is 18°.

[0022] Furthermore, as a preferred embodiment, the laser welder is provided with a laser channel, and a lens barrel is slidably connected within the laser channel. A focusing lens is detachably installed at the center of the lens barrel via a buckle.

[0023] The laser welder has a connecting groove located outside the laser channel. A bushing is slidably installed in the connecting groove, and a vertically arranged sliding hole is provided on the side wall of the connecting groove. A guide pin is fixed on the outer wall of the lens barrel, and the guide pin is slidably connected to the sliding hole.

[0024] The bushing has a guide groove inside, and the end of the guide pin is slidably connected to the guide groove.

[0025] Furthermore, as a preferred embodiment, a guide shaft is rotatably connected inside the support, and one end of the guide shaft is connected to the central shaft for transmission through gear meshing.

[0026] The other end of the guide shaft is fixed with a bevel gear, and a toothed ring is coaxially fixed outside the bushing, with the bevel gear meshing with the toothed ring.

[0027] Furthermore, as a preferred embodiment, the unfolded contour of the guide groove is symmetrically distributed in an inverted V shape, and the guide groove is configured as a three-section structure, which is sequentially configured as a downward sloping section, a corrugated section, and a smooth section from the middle outwards.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] In this invention, for oil pipeline welding, two oil pipelines are first butted together for initial welding, fixed, and rotated at a uniform speed by a roller device. Then, depending on the condition of the oil pipeline weld, welding is performed using either left-side or right-side arc welding. The laser welder is positioned directly above the arc melting point of the weld, thus achieving laser-arc hybrid welding. The laser welder can deflect in both directions around its central axis via a support, forming an arc-shaped welding trajectory. This allows the laser welder to create a continuous and uniform wavy welding trajectory at the weld in the oil pipeline hybrid welding process, increasing the weld penetration and width, improving the weld's mechanical properties and pressure resistance. Especially at the turning points of each wavy welding trajectory, the focusing lens in the laser welder can vibrate vertically to create a deep-penetration keyhole effect, further increasing the penetration near the turning point and, to some extent, preventing porosity and slag inclusions during welding, thus enhancing the overall integrity and strength of the weld. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the drive unit in this invention;

[0032] Figure 3 This is a schematic diagram of the composite welding device in this invention;

[0033] Figure 4 This is a cross-sectional view of the internal structure of the composite welding device in this invention;

[0034] Figure 5 This is a schematic diagram of the connecting groove structure in this invention;

[0035] Figure 6 This is a schematic diagram of the lens tube structure in this invention;

[0036] Figure 7 This is a schematic diagram of the guide groove in the present invention;

[0037] Figure 8 This is a schematic diagram of composite welding of pipe welds in this invention;

[0038] In the diagram: 1. Gantry frame; 11. Drive base; 12. Roller support device; 13. Machine base; 2. Drive unit; 21. Lifting beam; 22. Moving beam; 23. Positioning seat; 24. Upper crossbeam; 25. Positioning plate; 26. Fixed frame; 27. Machine plate; 28. Control unit; 29. ​​Lifting cylinder; 3. Composite welding device; 31. Machine housing; 32. Connecting frame; 33. Arc welding device; 34. Central shaft; 35. Support; 36. Guide shaft; 4. Laser welder; 41. Connecting groove; 42. Sliding hole; 43. Bushing; 5. Lens tube; 51. Focusing lens; 52. Snap ring; 53. Guide pin; 6. Lower inclined section; 61. Corrugated section; 62. Stable section. Detailed Implementation

[0039] Please see Figures 1-5 In this embodiment of the invention, the laser-arc composite welding device for oil pipelines includes: a gantry frame 1, a drive unit 2, and a welding unit.

[0040] The gantry frame 1 is equipped with a drive seat 11 that can slide and adjust in the horizontal direction. One end of the drive unit 2 is fixed to the drive seat 11, and the lower end of the gantry frame 1 can be equipped with push wheels for easy movement and transportation.

[0041] The welding unit is mounted on the drive unit 2, and the welding unit 3 includes two composite welding devices 3 that are symmetrically distributed on the left and right sides.

[0042] A roller support device 12 is provided on one side of the gantry frame 1 below the welding unit. Two connecting pipes are rolled on the roller support device 2. It should be noted that the two connecting pipes need to be manually spot welded around their circumference to make them neatly connected and fixed. Then, the workers place them on the roller support device 2, and the oil pipes are rotated by the self-driven roller support device 2.

[0043] In this embodiment, the driving unit 2 includes:

[0044] The lifting beam 21 is vertically fixed to one end face of the drive seat 11, and a movable beam 22 that slides vertically along its surface is horizontally arranged on one side of the lifting beam 21.

[0045] The positioning seat 23 is horizontally slidably mounted on the moving beam 22, and an upper crossbeam 24 parallel to the moving beam 22 is fixed at the upper end of the positioning seat 23.

[0046] The positioning plate 25 is installed on the upper crossbeam 24. The positioning plate 25 is connected to the vertically arranged machine plate 27 by symmetrically arranged fixing frames 26. The welding unit 3 is installed on the machine plate 27.

[0047] The control unit 28 is mounted on the upper crossbeam 24. The control unit 28 can control the positioning seat 23 to slide horizontally along the moving beam 22, and can also control the moving beam 22 to adjust its vertical displacement relative to the lifting beam 21.

[0048] In a preferred embodiment, a guide rail is fixed to one side of the upper crossbeam 24, the positioning plate 25 is slidably connected to the guide rail, and a fine-tuning cylinder is installed on the upper crossbeam 24. The telescopic end of the fine-tuning cylinder is connected to the positioning plate 25. Therefore, the fine-tuning cylinder can perform horizontal sliding fine-tuning of the welding point of the composite welding device 3 during the subsequent welding process.

[0049] A column is vertically slidably connected inside the positioning plate 25. The upper end of the column is fixed to the fixing frame 26. A lifting cylinder 29 is installed below the positioning plate 25. The output end of the lifting cylinder 29 is connected to the column, so that the welding point of the composite welding device 3 can be vertically slidably adjusted during the subsequent welding process.

[0050] In this embodiment, two bases 13 are symmetrically mounted on the positioning plate 25. A rotating shaft is rotatably connected inside the base 13. Each composite welding device 3 is fixed to one end of the rotating shaft, so that the corresponding composite welding device 3 can be deflected around the rotating shaft by rotating the shaft, which facilitates the adjustment of the inclination of the composite welding device 3 relative to the weld.

[0051] In this embodiment, the composite welding device 3 includes:

[0052] The housing 31 has a connecting frame 32 fixed on one side, and an arc welding device 33 is installed on the connecting frame 32;

[0053] The central shaft 34 is vertically fixed to the lower end face of the housing 31. A support 35 is provided below the housing 31. The central shaft 34 is rotatably connected to the support 35 through a bearing.

[0054] The laser welder 4 is tilted and fixed to one side of the support 35. A control motor can be installed outside the housing 31, which can drive the support 35 to deflect in both directions through gear meshing. This ensures that the laser welder 4 reciprocates around the central axis 34. This configuration can form a continuous and uniform wavy welding trajectory at the butt weld of the oil pipeline, increasing the penetration depth and width, making the weld more compact, and thus significantly improving the mechanical properties and pressure resistance of the weld. Especially when combined with the molten pool of arc welding, the overlap area between the laser beam and the arc heat field expands, and the weld width increases by 30%-50%.

[0055] In this embodiment, the arc welding device in each of the composite welding devices 3 is located on the left or right side of the oil pipeline weld. For example, when the arc welding device is located on the left side of the oil pipeline weld, it welds the weld at an angle. At this time, a shallow and wide molten pool can be formed on the right side of the weld, which is suitable for pipelines with high alloy or special materials that are sensitive to heat.

[0056] The tilt angle of the laser welder 4 is 18°.

[0057] In a preferred embodiment, the laser welder 4 is provided with a laser channel, and a lens barrel 5 is slidably connected in the laser channel. A focusing lens 51 is detachably installed in the center of the lens barrel 5 through a buckle 52.

[0058] The laser welder 4 has a connecting groove 41 located outside the laser channel. A bushing 43 is slidably installed in the connecting groove 41, and a vertically arranged sliding hole 42 is opened on the side wall of the connecting groove 41. A guide pin 53 is fixed on the outer wall of the lens barrel 5, and the guide pin 53 is slidably connected to the sliding hole 42. The focusing lens 51 in the lens barrel 5 can adjust the laser focus position as the lens barrel 5 slides up and down. When the focusing lens 51 moves downward, the laser focus will be closer to the workpiece surface, thereby reducing the spot diameter and increasing the power density, thus forming a deeper penetration or higher energy density welding effect.

[0059] The bushing 43 has a guide groove inside, and the end of the guide pin 53 is slidably connected to the guide groove. Thus, the bushing 43 can control the mirror tube 5 to slide up and down accordingly through the sliding action of the guide pin 53 and the guide groove under the action of rotation.

[0060] In this embodiment, a guide shaft 36 is rotatably connected inside the support 35, and one end of the guide shaft 36 is connected to the central shaft 34 for transmission through gear meshing.

[0061] The other end of the guide shaft 36 is fixed with a bevel gear, and a toothed ring is coaxially fixed to the outside of the bushing 43. The bevel gear meshes with the toothed ring. In this case, the laser welder 4 is initially positioned on the same plane as the weld seam of the oil pipeline. At this time, the lens barrel 5 is located above the inside of the laser channel. As the laser welder 4 deflects around the central axis 34, the lens barrel 5 inside it can move vertically downward along the laser channel through the sliding action of the guide groove on the bushing 43 and the guide pin 53, thereby gradually increasing the penetration depth of the laser welding pool and enhancing the keyhole effect near the turning point of each wavy welding trajectory.

[0062] In this embodiment, the unfolded contour of the guide groove is symmetrically distributed in an inverted V shape, so that when the laser welder 4 deflects in the forward or reverse direction around the central axis 34, the internal lens barrel 5 follows a uniform motion trajectory. The guide groove is configured as a three-section structure, consisting of a downward sloping section 6, a corrugated section 61, and a stable section 62 from the middle outward. When the guide pin 53 passes through the downward sloping section 6, the lens barrel 5 moves vertically downward along the laser channel. When the guide pin 53 passes through the corrugated section 61, the lens barrel 5 can slide up and down, allowing the focusing lens 51 in the lens barrel 5 to vibrate fully vertically near the turning point of the wavy welding trajectory, forming a deep melt keyhole effect, thereby further increasing the melt depth near the turning point and, to a certain extent, creating a stirring effect on the molten pool. The stable section 62 is short, and the guide pin 53 stops at the stable section 62, while the laser welder 4 stops deflecting.

[0063] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A laser-arc hybrid welding device for oil pipelines, characterized in that, It includes: Gantry frame (1), drive unit (2), and welding unit; The gantry (1) is equipped with a drive seat (11) that can slide and adjust in the horizontal direction, and one end of the drive unit (2) is fixed to the drive seat (11); The welding unit is mounted on the drive unit (2), and the welding unit includes two composite welding devices (3) that are symmetrically distributed on the left and right. A roller support device (12) is provided on one side of the gantry frame (1) below the welding unit, and two docking pipes are rolled on the roller support device (12); The composite welding device (3) includes: The housing (31) has a connecting frame (32) fixed on one side, and an arc welding device (33) is installed on the connecting frame (32). The central shaft (34) is vertically fixed to the lower end face of the housing (31). A support (35) is provided below the housing (31). The central shaft (34) is rotatably connected to the support (35) through a bearing. The laser welder (4) is tilted and fixed to one end face of the support (35); The laser welder (4) is provided with a laser channel, and a lens tube (5) is slidably connected in the laser channel. A focusing lens (51) is detachably installed in the center of the lens tube (5) through a buckle (52). The laser welder (4) has a connecting groove (41) located outside the laser channel. A bushing (43) is slidably installed in the connecting groove (41). A vertically arranged sliding hole (42) is opened on the side wall of the connecting groove (41). A guide pin (53) is fixed on the outer wall of the lens tube (5). The guide pin (53) is slidably connected to the sliding hole (42). The bushing (43) has a guide groove inside, and the end of the guide pin (53) is slidably connected to the guide groove; The support (35) is rotatably connected to a guide shaft (36), one end of which is connected to the central shaft (34) for transmission via gear meshing. The other end of the guide shaft (36) is fixed with a bevel gear, and a toothed ring is coaxially fixed to the outside of the bushing (43), and the bevel gear meshes with the toothed ring; The unfolded outline of the guide groove is symmetrically distributed in an inverted V shape, and the guide groove is set as a three-section structure, which is set as a downward sloping section (6), a corrugated section (61) and a smooth section (62) from the middle outward.

2. The laser-arc hybrid welding device for oil pipelines according to claim 1, characterized in that: The driving unit (2) includes: The lifting beam (21) is vertically fixed to one end face of the drive seat (11), and a movable beam (22) that slides vertically along its surface is horizontally arranged on one side of the lifting beam (21). The positioning seat (23) is horizontally slidably mounted on the moving beam (22), and the upper end of the positioning seat (23) is fixed with an upper crossbeam (24) parallel to the moving beam (22). A positioning plate (25) is installed on the upper crossbeam (24). A vertically arranged machine plate (27) is connected to the positioning plate (25) by a symmetrically arranged fixing frame (26). The welding unit is installed on the machine plate (27). The control unit (28) is mounted on the upper crossbeam (24).

3. The laser-arc hybrid welding device for oil pipelines according to claim 2, characterized in that: A guide rail is fixed on one side of the upper crossbeam (24), the positioning plate (25) is slidably connected to the guide rail, and a fine adjustment cylinder is installed on the upper crossbeam (24). The telescopic end of the fine adjustment cylinder is connected to the positioning plate (25). A column rod is vertically slidably connected inside the positioning plate (25). The upper end of the column rod is fixed to the fixing frame (26). A lifting cylinder (29) is installed below the positioning plate (25). The output end of the lifting cylinder (29) is connected to the column rod.

4. The laser-arc hybrid welding device for oil pipelines according to claim 2, characterized in that: Two machine bases (13) are symmetrically mounted on the positioning plate (25). A rotating shaft is rotatably connected inside the machine base (13), and each of the composite welding devices (3) is fixed to one end of the rotating shaft.

5. The laser-arc hybrid welding device for oil pipelines according to claim 1, characterized in that: The arc welding device in each of the composite welding devices (3) is located on the left or right side of the oil pipeline weld; The tilt angle of the laser welder (4) is 18°.

Images