Large steel column submerged-arc welding system and welding method

Abstract

The invention provides a submerged-arc welding system and method for a large steel column, and mainly relates to the field of welding. A large steel column submerged-arc welding system comprises a portal frame and a pair of symmetrically-arranged overturning seats, overturning discs are rotationally arranged on the overturning seats, driving mechanisms are arranged on the overturning seats, a bearing frame is connected between the two overturning discs, limiting frames are detachably arranged at the two ends of the bearing frame, and a plurality of positioning seats are arranged on the two sides of the overturning seats in an array mode. Longitudinal rails are arranged on the outer sides of the positioning seats, the portal frame is slidably connected with the longitudinal rails, a power system used for driving the portal frame to slide along the longitudinal rails in a reciprocating mode is arranged at the bottom of the portal frame, and a transverse rail and a transverse displacement mechanism are arranged at the top of the portal frame. A placement platform is arranged at the bottom of the vertical lifting mechanism; and a submerged arc welding machine is arranged on the placement platform. The lattice steel column welding device has the beneficial effect that the lattice steel column welding efficiency can be greatly improved.

Description

Technical Field

[0001] The invention mainly relates to the field of welding, and in particular to a large steel column submerged arc welding system and a welding method. Background Art

[0002] The limbs that make up the lattice steel column are generally made of channel steel or I-shaped steel, and the tie bars are generally made of angle steel. Horizontal tie bars and oblique tie bars can be set, or only oblique tie bars can be set. The tie plates are generally made of steel plates. Lattice steel columns are widely used in factory building construction, crane frames, etc. Depending on the design requirements, the size span of the lattice steel column is extremely large. When the width of the lattice steel column reaches more than 2 meters, the welding processing of the steel column becomes a problem.

[0003] At present, when welding large lattice steel columns, the spot welding of the main body of the steel column and the two sides is first completed manually, and then it is placed on the inclined welding fixture by crane hoisting, and the welder completes the submerged arc welding of the single-sided weld. After the welding of the weld is completed, it is necessary to use the crane hoist to flip the steel column again, and then weld the next weld. Repeating this process for a lattice steel column requires three flips and four positioning of the steel column and the fixture. The hoisting and positioning of such a large steel column consumes huge time and labor costs, and there are great safety hazards, which makes the welding efficiency of lattice steel columns extremely low. Summary of the invention

[0004] In order to solve the deficiencies of the prior art, the present invention provides a large steel column submerged arc welding system and a welding method, which can greatly improve the welding efficiency of lattice steel columns.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions: A large steel column submerged arc welding system comprises a gantry and a pair of symmetrically arranged turning seats, a turning disk is rotatably arranged on the turning seats, a driving mechanism for driving the turning disk to rotate is arranged on at least one of the turning seats, a bearing frame is connected between the two turning disks, limit frames are detachably arranged at both ends of the bearing frame, a plurality of locking devices are arranged on the limit frames, a plurality of positioning seats are arranged in an array on both sides of the turning seat, hydraulic cylinders are obliquely arranged on the positioning seats, a positioning plate is connected between a plurality of the hydraulic cylinders, the positioning plate is 30-60 degrees with the horizontal plane, a longitudinal track is arranged outside the positioning seat, the gantry is slidably connected to the longitudinal track, a power system for driving the gantry to reciprocate along the longitudinal track is arranged at the bottom of the gantry, a transverse track and a transverse displacement mechanism are arranged at the top of the gantry, a transverse displacement seat is slidably arranged on the transverse track, the transverse displacement mechanism is used to drive the transverse displacement seat to reciprocate along the transverse track, a vertical lifting mechanism is arranged on the transverse displacement seat, a placement platform is arranged at the bottom of the vertical lifting mechanism, and a submerged arc welding machine is arranged on the placement platform.

[0006] The support frame is a rectangular frame, and the end of the support frame is fixedly connected to a position below the rotating shaft of the flip plate.

[0007] A plurality of mounting holes adapted to the limiting frame are linearly arranged at the end of the bearing frame, and the mounting holes are connected to the limiting frame via fasteners.

[0008] The locking device is a friction plate, and a plurality of fastening bolts are arranged at the front end of the limiting frame. After the fastening bolts are hung and tightened, the friction plate is pressed against the surface of the steel column.

[0009] The positioning seat is hinged to the bottom of the hydraulic cylinder, and the angle of the hydraulic cylinder is adjustable.

[0010] The vertical lifting mechanism comprises a fixed arm and a sliding arm, the fixed arm is slidably connected to the sliding arm, a telescopic cylinder is arranged between the fixed arm and the sliding arm, and the placement platform is arranged at the bottom of the sliding arm.

[0011] A welding method for a large steel column is as follows: S1: hoist the steel column onto the load-bearing frame and limit it with the limit frame; S2: The turning plate drives the upper limit steel column on the bearing frame to turn over a certain angle, so that the steel column slides under the action of gravity, and its bottom side is in contact with the positioning plate on the side to be positioned, and then it moves along the longitudinal track through the gantry, and the submerged arc welding of the steel column body on this side and the side is completed by the submerged arc welding machine; S3: Then the turning plate drives the upper limit steel column on the bearing frame to turn to the other side at a certain angle, so that the steel column slides under the action of gravity, and the side edge of the other side contacts the positioning plate on the side and is positioned, and then the submerged arc welding machine moves to the side to be welded, and moves along the longitudinal track through the gantry, and the submerged arc welding of the steel column body on this side and the side edge is completed by the submerged arc welding machine; S4: Next, the turning plate drives the steel column at the upper limit of the load-bearing frame to turn to a horizontal state, and the steel column is pulled by the crane to one side to contact the side of the load-bearing frame, and the steel column is fixed to the load-bearing frame by the locking device, so that the steel column is in a state where one side is shorter and the other side is longer, and then the turning plate drives the steel column to turn 180 degrees with the shorter side downward and the longer side upward, and then the locking device is released, and the shorter side of the steel column is pulled by the crane to make the lengths of both sides of the steel column consistent; Then repeat steps S3 and S4 to complete the submerged arc welding of the steel column body and the side seam on this surface. After welding, repeat step S4, turn the welded steel column over again, release the limit frame and hoist the welded steel column down.

[0012] Specifically, in steps S2 and S3, when the positioning plate supports the side of the steel column, the hydraulic cylinder extends to push the positioning plate out. When the positioning plate supports the side of the steel column, the hydraulic cylinder contracts to drive the steel column to continue sinking to the lowest point.

[0013] Specifically, when the overturning plate drives the steel column to overturn, the gantry is reset to the initial position and leaves the overturning area of ​​the steel column.

[0014] Compared with the prior art, the beneficial effects of the present invention are: The present invention provides an auxiliary device for welding large lattice steel columns. The device solves the problem that the existing welding tooling is fixed and cannot adjust the angle. The device can carry large lattice steel columns and adjust the angle of the steel columns, making the welding of the welds of the steel columns easier. Through the flipping action of the bearing frame, the welding of four welds can be completed in one hoisting, which reduces many links of hoisting and adjusting the steel columns, thereby reducing the preparation work before welding the steel columns and improving the overall welding efficiency.

[0015] The device has a simple structure and is safer to operate, and can effectively reduce the occurrence of safety accidents caused by hoisting.

[0016] The welding method for large lattice steel columns provided by the present invention makes full use of the flipping structure of the welding device to perform operations such as angle adjustment and flipping of the steel columns to the other side, and can complete submerged arc welding of four welds after one hoisting. The entire welding process has a high degree of automation, and only relatively easy tightening operations need to be completed manually, effectively solving the problem of low welding efficiency of large steel columns. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 It is a schematic diagram of the stereoscopic viewing angle structure of the present invention; Attached Figure 2 It is a schematic diagram of the main viewing angle structure of the present invention; Attached Figure 3 It is a schematic diagram of the structure of the present invention from a top view perspective; Attached Figure 4 It is a schematic diagram of the structure of the carrier frame of the present invention; Attached Figure 5 It is a schematic diagram of the structure of the carrier frame part of the present invention from a left perspective; Attached Figure 6 The present invention Figure 1 A partial enlarged structural diagram of the middle part; Attached Figure 7 The present invention Figure 2 A schematic diagram of the partially enlarged structure of the middle B part; Attached Figure 8 It is a schematic diagram of the structure of the carrier frame of the present invention.

[0018] Numbers shown in the accompanying drawings: 1. turning plate; 2. turning seat; 3. limiting frame; 4. positioning seat; 5. gantry; 6. vertical lifting mechanism; 7. submerged arc welding machine; 11. driving mechanism; 12. bearing frame; 13. mounting hole; 31. locking device; 41. hydraulic cylinder; 42. positioning plate; 51. longitudinal track; 52. power system; 53. transverse track; 54. transverse displacement mechanism; 55. transverse seat; 61. placement platform; 62. fixed arm; 63. sliding arm; 64. telescopic cylinder. DETAILED DESCRIPTION

[0019] The present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope limited by the application.

[0020] like Figure 1-8 As shown, a large steel column submerged arc welding system according to the present invention comprises a gantry 5 and a pair of symmetrically arranged flip seats 2, wherein the gantry 5 serves as a mounting and displacement mechanism for a submerged arc welding machine 7 to perform submerged arc welding. The two flip seats 2 are arranged opposite to each other, and the flip seats 2 are fixed to the workshop floor by anchor bolts to ensure the fixation of the two flip seats 2, so that the lattice steel column can be stably supported and flipped to avoid the occurrence of safety accidents.

[0021] The flip disc 1 is rotatably arranged on the flip seat 2, and the flip disc 1 is rotatably installed on the inner side of the flip seat 2 through a rotating shaft. Since the weight of the lattice steel column carried is large, and the flip disc 1 only performs a slow small-range flip, the rotating shaft of the flip disc 1 and the flip seat 2 are connected by direct assembly in this embodiment, and no bearing is installed between the two. At the same time, the name of the flip disc 1 is only the name of the structure, and it is not necessarily designed as a disc-shaped structure. In order to reduce weight and save costs, the flip disc 1 in this embodiment is a frame-shaped structure welded by square tubes. A driving mechanism 11 for driving the flip disc 1 to rotate is installed on at least one flip seat 2. The driving mechanism 11 adopts a gear reduction box driven by a servo motor, and the output shaft of the gear reduction box is coaxially connected with the rotating shaft of the flip disc 1. Driven by the servo motor, the flip disc 1 can be driven to swing and flip at a fixed angle, so that the steel column can be horizontal, flipped to a certain angle to both sides, or complete 180-degree flipping and other operations.

[0022] A support frame 12 is connected between the two flip plates 1. In this embodiment, the support frame 12 is a rectangular frame welded by square tubes or steel sections. The support frame 12 is used to support the steel column. The end of the support frame 12 is fixedly connected to the lower part of the rotation axis of the flip plate 1, so that when the lattice steel column is placed on the support frame 12, the main part of the steel column is located at the axis center of the flip plate 1.

[0023] The limiting frames 3 are detachably provided at both ends of the bearing frame 12, and a plurality of locking devices 31 are provided on the limiting frames 3. The limiting frames 3 are of an "L"-shaped structure. After the limiting frames 3 are installed on the bearing frame 12, a limiting space is formed between the limiting frames 3 and the bearing frame 12. The limiting space is slightly larger than the thickness of the steel plate of the main body of the steel column, so that the main body of the steel column can be limited within the limiting space. The limiting frames 3 are used to limit the steel column, so as to prevent the steel column from tipping over when the turning plate 1 is tilted, thereby preventing a safety accident.

[0024] Specifically, in this embodiment, the limit frame 3 is mounted on the support frame 12 by fasteners. A plurality of mounting holes 13 adapted to the limit frame 3 are linearly provided on the support frame 12, and the mounting holes 13 are connected to the limit frame 3 by fasteners. In order to ensure the installation strength, multiple rows and columns of fastening bolts are arranged on the limit frame 3, so that the limit frame 3 can stably restrict the steel column. At the same time, the mounting holes 13 arranged in an array can also facilitate the limit frame 3 to adjust the installation position, so that steel columns of different heights can be positioned.

[0025] Specifically, the locking device 31 is used to lock the steel column, so that the steel column can be turned 180 degrees by the turning plate 1, thereby realizing the welding operation of the two welds on the other side of the steel column. In this embodiment, the locking device 31 is a friction plate, and a plurality of fastening bolts are arranged at the front end of the limit frame 3. After the fastening bolts are locked, the friction plate is pressed against the surface of the steel column, thereby realizing the fixation of the steel column. More specifically, when the steel column is turned over, no operator should be left around the site to avoid injury accidents.

[0026] A plurality of positioning seats 4 are arranged in an array on both sides of the flip seat 2, and the positioning seats 4 are also fixed to the ground by expansion bolts. A hydraulic cylinder 41 is arranged obliquely on the positioning seat 4, and a positioning plate 42 is connected between the plurality of hydraulic cylinders 41, and the positioning plate 42 is 30-60 degrees to the horizontal plane, so that the inclined side of the steel column is positioned and loaded by the positioning plate 42, so that the joint between the main body and the side of the steel column is exposed, which is convenient for the welding operation of the submerged arc welding machine 7. The setting of the hydraulic cylinder 41 can adjust the height of the side, so as to adjust it according to the steel columns of different widths, and complete the stable support for the steel column.

[0027] Specifically, the positioning seat 4 is hinged to the bottom of the hydraulic cylinder 41, and the angle of the hydraulic cylinder 41 is adjustable. The bottom of the hydraulic cylinder 41 is fixedly connected to the positioning seat 4 by fasteners. By adjusting the angle of the hydraulic cylinder 41, the inclined welding angle of the steel column can be adjusted according to the size of the steel column, so as to achieve a better welding effect at the weld of the steel column.

[0028] More specifically, when the positioning plate 42 is used to support the side of the steel column, the positioning plate 42 can be lifted by extending the hydraulic cylinder 41. After the turning plate 1 drives the steel column to turn over, the steel column slides down under its own gravity, and the side of the steel column falls on the positioning plate 42. Then the hydraulic cylinder 41 contracts, and the steel column can continue to slide down with the positioning plate 42. This method of pre-supporting the steel column by the lifting effect of the hydraulic cylinder 41 can effectively reduce the impact of the steel column sliding down on the positioning plate 42, thereby reducing the occurrence of safety accidents and increasing the service life of the equipment.

[0029] A longitudinal track 51 is arranged outside the positioning seat 4, and the gantry 5 is slidably connected to the longitudinal track 51. A power system 52 is arranged at the bottom of the gantry 5 for driving the gantry 5 to slide back and forth along the longitudinal track 51. Specifically, the gantry 5 is used to carry the welding machine and drive the welding machine to complete the displacement to complete the submerged arc welding operation of the steel column weld. The gantry 5 is driven by the power system 52. Specifically, the power system 52 is a driving motor with a belt drive or a gear box transmission mechanism. The transmission mechanism drives the power wheel, and the power wheel drives the gantry 5 to slowly move along the longitudinal track 51 as a whole.

[0030] A transverse track 53 and a transverse displacement mechanism 54 are arranged on the top of the gantry 5. A transverse displacement seat 55 is slidably arranged on the transverse track 53. In this embodiment, the transverse displacement mechanism 54 is a synchronous belt drive mechanism or a screw drive mechanism. The transverse displacement mechanism 54 is used to drive the transverse displacement seat 55 to slide back and forth along the transverse track 53, thereby driving the transverse displacement seat 55 to accurately move to any position on the transverse track 53. A vertical lifting mechanism 6 is arranged on the transverse displacement seat 55. The vertical lifting mechanism 6 includes a fixed arm 62 and a sliding arm 63. The fixed arm 62 is slidably connected with the sliding arm 63. A telescopic cylinder 64 is arranged between the fixed arm 62 and the sliding arm 63. A placement platform 61 is arranged at the bottom of the sliding arm 63. A submerged arc welding machine 7 is arranged on the placement platform 61. The hose and the conductive nozzle of the submerged arc welding machine 7 for conveying flux are located below the placement platform 61, so that they can contact with the weld to complete the submerged arc welding, so that the placement platform 61 does not interfere with the steel column during welding.

[0031] A welding method for a large steel column uses the above welding equipment to complete the positioning and welding of the lattice steel column. Specifically, the welding method completes the welding of the welds on both sides by carrying and limiting the main steel plate of the steel column and driving the steel column to swing at a certain angle. At the same time, the method also realizes the flipping of the steel column at a lower position, and can complete the welding of four welds on both sides of the steel column in one hoisting, which greatly improves the welding efficiency.

[0032] Before using the device to weld the steel column, the worker first completes the spot welding of the steel column under the positioning of the positioning tool, so that the main steel plate of the steel column and the two side plates are relatively fixed. Then the steel column is hoisted and placed on the bearing frame 12, which is in a horizontal state at this time, and then the limiting member 3 is fastened to both ends of the bearing frame 12, so that the bottom of the limiting frame 3 is limited to the main steel plate of the steel column to prevent it from slipping.

[0033] After the steel column is positioned, the turning plate 1 drives the upper limit steel column of the carrier frame 12 to turn 40 degrees, so that the steel column slides under the action of gravity, and its bottom side is positioned against the positioning plate 42 on this side. At this time, the top weld of this side is exposed, and the main steel plate of the steel column forms a certain angle with the side plate, which can better accommodate the flux, make the weld more uniform, and achieve better welding effect. The gantry 5 moves along the longitudinal track 51, and the submerged arc welding machine 7 completes the submerged arc welding of the main body of the steel column and the side. After the welding is completed, the placement platform 61 drives the submerged arc welding machine 7 to rise and detach from the weld, and then the gantry 5 drives the submerged arc welding machine 7 to reset.

[0034] Then the turning plate 1 drives the upper limit steel column of the carrier frame 12 to turn to the other side 40 degrees, so that the steel column slides under the action of gravity, and the side edge of the other side contacts the positioning plate 42 on this side and is positioned. Then the submerged arc welding machine 7 is driven by the lateral displacement mechanism 54 to move to the side to be welded, and is displaced along the longitudinal track 51 by the gantry 5, and the submerged arc welding of the steel column body and the side edge on this side is completed by the submerged arc welding machine 7. After the welding is completed, the placement platform 61 drives the submerged arc welding machine 7 to rise and leave the weld, and then drives the submerged arc welding machine 7 to reset through the gantry 5.

[0035] Specifically, there are two ways to flip and reset the steel column or flip it to the other side after welding. One is to lift the steel column to a certain height by the hydraulic cylinder 41, and the hydraulic cylinder 41 shrinks while the flip plate 1 rotates to the other side, and the limit frame 3 clamps the main steel plate of the steel column to stop it from sliding down to complete the flip. This method is suitable for steel columns that are not too heavy. Another method is to lift the steel column to a moving height by the hydraulic cylinder 41, lock the steel column by the locking device 31, and then shrink the hydraulic cylinder 41 to complete the flipping operation of the steel column. This method adds the step of locking the steel column, but is safer. In actual operation, it is recommended to use this method to complete the flipping of the steel column. More specifically, if the hydraulic cylinder 41 has not shrunk to the shortest state after receiving the steel column, the steel column can also be lifted without the hydraulic cylinder 41. First, the steel column is locked by the locking device 31, and then the hydraulic cylinder 41 shrinks directly to expose enough space for the steel column to flip, and then the flipping operation of the steel column can be completed directly.

[0036] When the turning disc 1 drives the steel column to turn over, the gantry 5 is reset to the initial position and leaves the turning area of ​​the steel column, avoiding interference between the turning of the steel column and the gantry 5, and also avoiding interference between the vertical lifting mechanism 6 on the gantry 5 and the steel column when it moves along the transverse track 53.

[0037] After the welding of the welds on both sides of the steel column is completed, the steel column at the upper limit of the support frame 12 is driven by the turning plate 1 to turn to a horizontal state, and the steel column is pulled to one side by the driving crane to touch the side of the support frame 12, and the steel column is fixed to the support frame 12 by the locking device 31, so that the steel column is in a state of one side being short and the other side being long, and then the steel column is driven by the turning plate 1 to turn 180 degrees from the shorter side downward and the longer side upward, and then the locking device 31 is released, and the shorter side of the steel column is pulled by the driving crane to make the lengths of both sides of the steel column consistent. This operation completes the turning operation of the steel column, exposing the two unwelded welds on the top.

[0038] Then repeat steps S3 and S4 to complete the submerged arc welding of the steel column body and the side seam of the surface. After welding, repeat step S4 to turn the welded steel column over again, release the limit frame 3 and hoist the welded steel column down.

[0039] The welded steel columns are hoisted to one side for air cooling for 2-6 hours. After the weld temperature drops, they are sent to the straightening machine to correct the deformation caused by welding.

[0040] Specifically, in steps S2 and S3, when the positioning plate 42 supports the side of the steel column, the hydraulic cylinder 41 extends to push out the positioning plate 42. When the positioning plate 42 supports the side of the steel column, the hydraulic cylinder 41 contracts to drive the steel column to continue sinking to the lowest point.

Claims

1. A large steel column submerged arc welding system, comprising a gantry (5) and a pair of symmetrically arranged turning seats (2), characterized in that: A turning disc (1) is rotatably arranged on the turning seat (2), a driving mechanism (11) for driving the turning disc (1) to rotate is arranged on at least one of the turning seats (2), a bearing frame (12) is connected between the two turning discs (1), limiting frames (3) are detachably arranged at both ends of the supporting frame (12), a plurality of locking devices (31) are arranged on the limiting frames (3), a plurality of positioning seats (4) are arranged in an array on both sides of the turning seat (2), hydraulic cylinders (41) are obliquely arranged on the positioning seats (4), positioning plates (42) are connected between the plurality of hydraulic cylinders (41), the positioning plates (42) are at an angle of 30-60 degrees to the horizontal plane, and a longitudinal track (31) is arranged on the outer side of the positioning seat (4). 51), the gantry (5) is slidably connected to the longitudinal track (51), a power system (52) for driving the gantry (5) to slide back and forth along the longitudinal track (51) is arranged at the bottom of the gantry (5), a transverse track (53) and a transverse displacement mechanism (54) are arranged at the top of the gantry (5), a transverse displacement seat (55) is slidably arranged on the transverse track (53), the transverse displacement mechanism (54) is used to drive the transverse displacement seat (55) to slide back and forth along the transverse track (53), a vertical lifting mechanism (6) is arranged on the transverse displacement seat (55), a placement platform (61) is arranged at the bottom of the vertical lifting mechanism (6), and a submerged arc welding machine (7) is arranged on the placement platform (61).

2. A large steel column submerged arc welding system according to claim 1, characterized in that: The support frame (12) is a rectangular frame, and an end of the support frame (12) is fixedly connected to a position below the rotating shaft of the flip plate (1).

3. A large steel column submerged arc welding system according to claim 1, characterized in that: A plurality of mounting holes (13) adapted to the limiting frame (3) are linearly arranged at the end of the bearing frame (12); the mounting holes (13) are connected to the limiting frame (3) via fasteners.

4. A large steel column submerged arc welding system according to claim 1, characterized in that: The locking device (31) is a friction plate, and a plurality of fastening bolts are arranged at the front end of the limiting frame (3). After the fastening bolts are hung and tightened, the friction plate is pressed against the surface of the steel column.

5. A large steel column submerged arc welding system according to claim 1, characterized in that: The positioning seat (4) is hinged to the bottom of the hydraulic cylinder (41), and the angle of the hydraulic cylinder (41) is adjustable.

6. A large steel column submerged arc welding system according to claim 1, characterized in that: The vertical lifting mechanism (6) comprises a fixed arm (62) and a sliding arm (63), the fixed arm (62) and the sliding arm (63) are slidably connected, a telescopic cylinder (64) is arranged between the fixed arm (62) and the sliding arm (63), and the placement platform (61) is arranged at the bottom of the sliding arm (63).

7. A method for welding a large steel column according to any one of claims 1 to 6, characterized in that: S1: hoisting the steel column onto the bearing frame (12), and limiting the position of the steel column by the limiting frame (3); S2: The turning plate (1) drives the upper limit steel column of the carrier frame (12) to turn over a certain angle, so that the steel column slides under the action of gravity, and its bottom side is positioned against the positioning plate (42) on this side, and then moves along the longitudinal track (51) through the gantry (5), and the submerged arc welding of the steel column body on this side and the side is completed by the submerged arc welding machine (7); S3: Then the turning plate (1) drives the upper limit steel column of the carrier frame (12) to turn to the other side at a certain angle, so that the steel column slides under the action of gravity, and the side edge of the other side abuts against the positioning plate (42) on this side to be positioned, and then the submerged arc welding machine (7) moves to the side to be welded, and moves along the longitudinal track (51) through the gantry (5), and the submerged arc welding of the steel column body on this side and the side edge is completed by the submerged arc welding machine (7); S4: Next, the turning plate (1) drives the steel column at the upper limit of the support frame (12) to turn to a horizontal state, and the steel column is pulled by the crane to one side to abut against the side of the support frame (12), and the steel column is fixed to the support frame (12) by the locking device (31), so that the steel column is in a state where one side is shorter and the other side is longer, and then the turning plate (1) drives the steel column to turn 180 degrees with the shorter side downward and the longer side upward, and then the locking device (31) is released, and the shorter side of the steel column is pulled by the crane to make the lengths of both sides of the steel column consistent; Then, steps S3 and S4 are repeated to successively complete the submerged arc welding of the steel column body and the side seam of the surface. After the welding is completed, step S4 is repeated to flip the welded steel column over again, and the limit frame (3) is released to hoist the welded steel column down.

8. A method for welding a large steel column according to claim 7, characterized in that: In steps S2 and S3, when the positioning plate (42) supports the side of the steel column, the hydraulic cylinder (41) extends to push the positioning plate (42) out, and when the positioning plate (42) supports the side of the steel column, the hydraulic cylinder (41) contracts to drive the steel column to continue to sink to the lowest point.

9. A method for welding a large steel column according to claim 7, characterized in that: When the turning plate (1) drives the steel column to turn over, the gantry (5) is reset to the initial position and leaves the turning area of ​​the steel column.

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