Welding equipment for plate tailor-welding and composite welding method thereof

Abstract

The composite welding device comprises a mounting frame, a plasma arc welding gun, a submerged-arc welding gun, a laser tracking probe and a recycling pipe, the plasma arc welding gun is used for plasma arc welding of the plates, the submerged-arc welding gun is used for submerged-arc welding of the plates, the laser tracking probe is used for obtaining welding seam information between the plates, and the recycling pipe is used for recycling the welding seam information between the plates. The recovery pipe is used for recovering welding flux required by submerged-arc welding; the laser tracking probe, the plasma arc welding gun, the submerged-arc welding gun and the recovery pipe are sequentially arranged on the mounting frame and located on the same straight line, so that the plasma arc welding gun and the submerged-arc welding gun can weld plates at the same time while welding seam information is obtained, and the welding precision and the welding efficiency are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of welding, and in particular relates to welding equipment for plate welding and a composite welding method thereof. Background Art

[0002] In the fields of shipbuilding, petrochemical equipment, etc., plate welding is often involved. Such plates are often thick. For the plate welding of medium and thick plates, argon arc welding or manual arc welding is often used for base welding, and then the back is cleaned and the bottom is welded. Then submerged arc welding is used for filling welding and cover welding on the front. During the welding process, in order to reduce welding deformation, the front and back sides of the plate need to be welded alternately. This welding method has the following shortcomings: (1) Since the two sides of the plate need to be alternately welded, it is difficult to turn the plate over. It needs to be turned over with the help of a turning device, and it also places very high requirements on the height of the welding production workshop; (2) It is impossible to achieve double-sided welding at the same time, and the welding process involves the switching of more than two welding methods and equipment, resulting in low welding efficiency; (3) For the welding of thick plates, a larger groove needs to be opened, which requires more filling materials, which increases the welding production cost and reduces the welding production rate.

[0003] The invention patent with application number 202210651291.5 discloses a welding gun conversion tooling for a welding robot, including a robot body, a welding arm is rotatably connected to the end of the robot body, a stepper motor for driving the welding arm to rotate is fixedly installed on the side of the robot body, a group of welding gun modules distributed in a linear array are fixedly installed on the inner wall of the welding arm, a screw drive module is fixedly installed on the inner wall of the welding arm, a gun pusher plate is slidably connected to the inner wall of the welding arm, the inner wall of the gun pusher plate is transmission-connected to the screw drive module, a magnetic control seat is fixedly installed on the surface of the gun pusher plate and corresponding to the position of each welding gun module, and a piston column cooperating with the welding gun module is slidably connected to the inner wall of the magnetic control seat. The above-mentioned welding gun conversion tooling has the following main deficiencies: (1) each welding gun works independently, resulting in the need for multiple welding for the same weld; (2) since the spacing and angles between the welding guns cannot be adjusted, the positional relationship between the welding heads of multiple welding guns cannot be adjusted, resulting in only a single welding eutectic pool being able to be achieved during the welding process, and the eutectic pool formed by welding cannot be fully coupled, partially coupled, or completely separated, making the function of the welding device relatively single. Summary of the invention

[0004] In view of the above shortcomings, the technical problem to be solved by the present invention is to provide a welding device for plate welding and a composite welding method thereof, so as to improve the welding difficulty and welding efficiency of the plate.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A composite welding device for plate welding comprises a mounting frame, a plasma arc welding gun for performing plasma arc welding on the plate, and at least one submerged arc welding gun for performing submerged arc welding on the plate. The plasma arc welding gun and the submerged arc welding gun are mounted on the mounting frame via a connecting assembly. The connecting assembly can slide and rotate relative to the mounting frame. The plasma arc welding gun and the submerged arc welding gun are located on the same straight line.

[0006] As a preferred solution of the present invention, the connecting assembly includes a sliding connecting piece slidably connected to the mounting frame and a rotating connecting piece for mounting a plasma arc welding gun or a submerged arc welding gun. The rotating connecting piece can be rotatably mounted on the sliding connecting piece to adjust the inclination angle of the plasma arc welding gun or the submerged arc welding gun through the rotating connecting piece.

[0007] As a preferred solution of the present invention, the sliding connection member includes a slider slidably connected to the mounting frame and a sleeve used to be connected to the rotating connection member, the sleeve portion is connected to the slider, an open groove for the sleeve diameter is provided on the sleeve, and a locking member adapted to the mounting frame is installed on the slider to lock the slider on the mounting frame.

[0008] As a preferred embodiment of the present invention, the rotating connecting member includes a clamp for rotatably mounting a plasma arc welding gun or a submerged arc welding gun and a welding gun sleeve for mounting the plasma arc welding gun or the submerged arc welding gun. The clamp is rotatably connected to the sliding connecting member, and the welding gun sleeve is inserted into the clamp.

[0009] As a preferred solution of the present invention, two connecting assemblies are installed at different heights of the submerged arc welding gun, and the submerged arc welding gun is adjustably mounted on the mounting frame through the two connecting assemblies.

[0010] As a preferred solution of the present invention, a laser tracking probe for obtaining weld information is also installed on the mounting frame, and the laser tracking probe is arranged at the front end of the plasma arc welding gun.

[0011] As a preferred solution of the present invention, a recovery pipe for recovering flux is also installed on the mounting frame, and the recovery pipe is arranged at the rear of the submerged arc welding gun.

[0012] The above-mentioned welding method of the composite welding device for plate welding comprises the following steps: S1, fixing the laser tracking probe, the plasma arc welding gun, and the submerged arc welding gun on the welding device in sequence, and adjusting the spacing and angle relationship between the plasma arc welding gun and the submerged arc welding gun according to the thickness of the welding plate; S2, start the welding device, aim the laser tracking probe, plasma arc welding gun, and submerged arc welding gun at the weld at the same time, obtain weld information through the laser tracking probe, and the welding device calculates the movement route of the welding device and the working quantity of the submerged arc welding gun according to the weld information; S3, the plasma arc welding gun and the submerged arc welding gun work simultaneously, the plasma arc welding gun is located at the front end of the submerged arc welding gun, the plasma arc welding gun is used to perform single-sided welding and double-sided forming welding on the plate, and then the submerged arc welding gun is used to perform submerged arc welding on the weld.

[0013] As a preferred solution of the present invention, in step S2, the working quantity of the submerged arc welding gun is positively correlated with the thickness of the plate.

[0014] As a preferred solution of the present invention, the plate is provided with a groove for submerged arc welding at the weld of the plate according to the thickness of the plate.

[0015] Compared with the prior art, the present invention has the following advantages: (1) a single welding device can be used to perform both plasma arc welding and submerged arc welding on a plate at one time, thereby increasing welding penetration, welding speed and welding cladding rate.

[0016] (2) Compared with the existing alternating front and back side welding, the present application avoids the back root cleaning, bottom welding and plate turning processes in the flat plate welding process by arranging multiple welding operations on the same side of the plate to be welded, thereby greatly improving the welding production efficiency and reducing the requirements for the welding workshop.

[0017] (3) Compared with the existing welding devices, the spacing and inclination angles between the welding guns in the present welding device can be adjusted, which is convenient for adjusting the positional relationship between the welding heads of multiple welding guns. By adjusting the positions of the welding heads of multiple welding guns, the eutectic pool formed by welding can be fully coupled, partially coupled and completely separated, thereby adapting to different welding requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the composite welding device.

[0019] Figure 2 It is a schematic diagram of the structure of the composite welding device without the plasma arc welding gun and the submerged arc welding gun.

[0020] Figure 3 yes Figure 2 Schematic diagram of the structure after rotating at a certain angle.

[0021] Figure 4 It is a structural schematic diagram of the connecting bracket.

[0022] Figure 5 It is a structural diagram of the connection block.

[0023] Figure 6 It is a structural diagram of the connected components.

[0024] Figure 7 It is a structural diagram of the clamp.

[0025] Figure markings: mounting frame 1, mounting rod 1-1, connecting bracket 1-2, slide rail 1-3, side rod 1-4, connecting block 1-5, connecting column 1-6, clamping hole 1-7, limit screw 1-8, adapter block 1-9, spinning block 1-10, probe mounting column 1-11, probe clamping block 1-12, plasma arc welding gun 2, submerged arc welding gun 3, welding gun body 3-1, hopper 3-2, connecting assembly 4, sliding connector 4-1, rotating connector 4-2, slider 4-3, sleeve 4-4, opening groove 4-5, locking member 4-6, clamp 4-7, welding gun sleeve 4-8, locking plate 4-9, locking screw 4-10, rotating shaft 4-11, welding gun clamp 4-12, laser tracking probe 5, recovery tube 6. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] A composite welding device for plate welding comprises a mounting frame 1, a plasma arc welding gun 2, a submerged arc welding gun 3, a laser tracking probe 5 and a recovery pipe 6. The plasma arc welding gun 2 is used for performing plasma arc welding on the plate, the submerged arc welding gun 3 is used for performing submerged arc welding on the plate, the laser tracking probe 5 is used for acquiring weld information between the plates, and the recovery pipe 6 is used for recovering the flux required for submerged arc welding. The laser tracking probe 5, the plasma arc welding gun 2, the submerged arc welding gun 3 and the recovery pipe 6 are sequentially arranged on the mounting frame, and the laser tracking probe 5, the plasma arc welding gun 2, the submerged arc welding gun 3 and the recovery pipe 6 are located on the same straight line, so that the plasma arc welding gun 2 and the submerged arc welding gun 3 can weld the plate while acquiring weld information, thereby improving welding accuracy and welding efficiency.

[0028] Plasma arc welding uses the high energy density beam of plasma arc as the welding heat source for molten welding. The welding energy is relatively concentrated, which makes the welding depth greater. Plasma arc welding is used for low welding to weld the weld seam of the plate, and then submerged arc welding is used to fill and cover the groove position of the plate, so that welding can be completed without turning the plate over.

[0029] The mounting frame 1 includes a mounting rod 1-1, a connecting bracket 1-2, at least two slide rails 1-3 and two side rods 1-4. The two side rods 1-4 are vertically arranged. The two slide rails 1-3 are fixed to the side rods 1-4 by screws to form a rectangular mounting frame. Connecting blocks 1-5 are installed on the two side ends of the side rods 1-4. Connecting columns 1-6 are provided on the connecting blocks 1-5. An embracing hole 1-7 is provided on the connecting bracket 1-2. The connecting column 1-6 is installed in the embracing hole 1-7. The length of the connecting column 1-6 is less than the axial length of the embracing hole 1-7. A limiting screw 1-8 is provided on the connecting column 1-6. The limiting screw 1-8 is used to abut against the connecting bracket 1-2. The limiting screw 1-8 can be loosened to adjust the mounting position of the mounting frame and the connecting bracket 1-2, thereby improving the assembly accuracy of the mounting frame 1, ensuring that the plasma arc welding gun 2, the submerged arc welding gun 3 and the laser tracking probe 5 on the mounting frame 1 can be set directly opposite the weld, thereby improving the welding accuracy. An adapter block 1-9 is provided on the mounting rod 1-1, and the connecting bracket 1-2 is adjustably mounted on the adapter block 1-9 through a spinning block 1-10. The structure of the spinning block 1-10 is similar to the structure of a screw, so that the relative position of the connecting bracket 1-2 and the mounting plate 1-1 is locked by the spinning block 1-10. A probe mounting column 1-11 is installed on the side rod 1-4, and a probe clamping block 1-12 is provided on the probe mounting column 1-11. The laser tracking probe 5 is installed on the probe clamping block 1-12. By adjusting the spacing between the probe clamping block 1-12 and the side rod 1-4, it is ensured that the laser tracking probe 5, the plasma arc welding gun 2, and the submerged arc welding gun 3 are located on the same straight line.

[0030] A connecting component 4 is adjustably installed on the slide rails 1-3, and the plasma arc welding gun 2 and the submerged arc welding gun 3 are installed on the mounting frame 1 through the connecting component 4. The connecting component 4 can slide and rotate relative to the mounting frame 1 to adjust the inclination angle between the plasma arc welding gun 2, the submerged arc welding gun 3 and the plate, and can also adjust the spacing between the plasma arc welding gun 2, the submerged arc welding gun 3 and the adjacent submerged arc welding guns 3.

[0031] The connecting assembly 4 includes a sliding connecting member 4-1 and a rotating connecting member 4-2. The sliding connecting member 4-1 is slidably installed on the slide rail 1-3, and the rotating connecting member 4-2 is rotatably installed on the sliding connecting member 4-1. The inclination angle of the plasma arc welding gun 2 or the submerged arc welding gun 3 is adjusted by rotating the rotating connecting member 4-2 relative to the sliding connecting member 4-1.

[0032] The sliding connector 4-1 includes a slider 4-3 and a sleeve 4-4. The rotating connector 4-2 is rotatably connected to the sleeve 4-4. The sleeve 4-4 is partially connected to the slider 4-3. Preferably, half of the semicircle of the sleeve 4-4 is connected to the slider 4-3, and the remaining circular surface of the sleeve 4-4 is separated from the slider 4-3 to facilitate deformation of the sleeve 4-4. An open groove 4-5 for the diameter of the sleeve 4-4 is provided on the sleeve 4-4, and a locking screw is provided at the open groove 4-5. The width of the open groove 4-5 is changed by the locking screw, so that the rotating connector 4-2 can be locked by the sleeve 4-4.

[0033] A dovetail groove is provided on the slider 4-3, and the slide rail 1-3 is installed in the dovetail groove. A locking member 4-6 is provided on the back of the slider 4-3, and the locking member 4-6 is adapted to the mounting frame 1. The slider 4-3 is locked on the mounting frame 1 through the cooperation of the locking member 4-6 and the mounting frame 1. Preferably, the locking member 4-6 includes a locking plate 4-9 and a locking screw 4-10. The locking plate 4-9 is fixed on the back of the slider 4-3, and the locking screw 4-10 is installed on the locking plate 4-9 through a thread, and the locking screw 4-10 abuts against the slide rail 1-3, thereby locking the slider 4-3.

[0034] The rotating connection member 4-2 includes a clamp 4-7 and a welding gun sleeve 4-8. The clamp 4-7 is provided with a rotating shaft 4-11. The clamp 4-7 is rotatably connected to the sliding connection member 4-1 through the rotating shaft 4-11. The angle of the plasma arc welding gun 2 or the submerged arc welding gun 3 relative to the mounting frame 1 is adjusted by adjusting the angle of the clamp 4-7. The welding gun sleeve 4-8 is inserted into the clamp 4-7. The side wall of the welding gun sleeve 4-8 is also provided with an opening to facilitate changing the inner diameter of the welding gun sleeve 4-8, so as to hold the welding gun tightly. The welding gun sleeve 4-8 is an insulating member used to insulate the submerged arc welding gun 3.

[0035] In this embodiment, the plasma arc welding gun 2 is rotatably mounted on the sliding connector 4-1 via a welding gun clamp 4-12, and a rotating shaft is provided on the welding gun clamp 4-12 to facilitate the rotatable connection between the welding gun clamp 4-12 and the sliding connector 4-1.

[0036] A connecting component 4 is provided on each of the two slide rails 1-3 of the mounting frame 1, and the submerged arc welding gun 3 is respectively connected to the two slide rails 1-3 through the two connecting components 4. The submerged arc welding gun 3 is fixed through the two connecting components 4 to ensure the installation stability of the submerged arc welding gun 3 and facilitate the angle adjustment of the submerged arc welding gun 3.

[0037] A recovery pipe 6 is also installed on the mounting frame 1 through the connecting assembly 4. The recovery pipe 6 is used to recover excess flux after submerged arc welding. Preferably, the recovery pipe 6 is connected to negative pressure equipment such as an exhaust fan and a vacuum cleaner.

[0038] The laser tracking probe 5, plasma arc welding gun 2, submerged arc welding gun 3, and recovery pipe 6 are arranged in sequence along the moving direction of the mounting frame 1, and at least ensure that the laser tracking probe 5, plasma arc welding gun 2, and submerged arc welding gun 3 are located in the same straight line. The mounting frame 1 is connected to the welding robot, and the mounting frame 1 is driven to translate by the welding robot, and the weld information is obtained by the laser tracking probe 5. The plasma arc welding gun 2 performs plasma arc welding on the plate, and the submerged arc welding gun 3 performs submerged arc welding on the plate, and the excess flux is recovered by the recovery pipe 6.

[0039] The submerged arc welding gun 3 comprises a welding gun body 3-1 and a hopper 3-2. The hopper 3-2 is connected to the welding gun body 3-1 and is used to provide flux to the welding gun body 3-1. The welding gun body 3-1 is fixed in a welding gun sleeve 4-8.

[0040] The welding method of the composite welding device for plate welding comprises the following steps: S1, fix the laser tracking probe 5, plasma arc welding gun 2, and submerged arc welding gun 3 on the welding device in sequence. During the installation process, adjust the relative positions of the sliding connector 4-1, the rotating connector 4-2, and the probe clamping block 1-12 and rotate the limit screw 1-8 to ensure that the laser tracking probe 5, plasma arc welding gun 2, and submerged arc welding gun 3 are located in the same straight line, and adjust the spacing and angle relationship between the plasma arc welding gun 2 and the submerged arc welding gun 3 according to the thickness of the welding plate. When the thickness of the plate is less than or equal to 8mm, welding is performed only by the plasma arc welding gun 2, and there is no need to adjust the plasma arc The positional relationship between the welding gun 2 and the submerged arc welding gun 3 is that when the thickness of the plate is greater than 8mm and less than or equal to 16mm, the submerged arc welding gun 3 is adjusted so that the welding wire tips of multiple submerged arc welding guns 3 are close to each other to ensure that multiple submerged arc welding guns 3 form a eutectic pool. At this time, the eutectic pool is in a fully coupled state. When the eutectic pool is fully coupled, the spacing between the welding wire tips is 3-5mm. When there are special requirements for welding, the eutectic pool is partially coupled and completely separated by adjusting the spacing and angle relationship between adjacent plasma arc welding guns 2, that is, the molten pool formed by welding multiple welding guns is in a partially overlapped or completely separated state. When the eutectic pool is partially coupled, the spacing between the welding wire tips is 5-12mm, and when the eutectic pool is completely separated, the spacing between the welding wire tips is greater than 12mm.

[0041] S2, start the welding device, and aim the laser tracking probe 5, plasma arc welding gun 2, and submerged arc welding gun 3 at the weld at the same time by adjusting the connecting bracket 1-2, obtain the weld information through the laser tracking probe 5, and the welding device calculates the movement route of the welding device and the working quantity of the submerged arc welding gun 3 according to the weld information. The working quantity of the submerged arc welding gun 3 is positively correlated with the thickness of the plate, that is, when the weld depth is less than or equal to 8mm, the working quantity of the submerged arc welding gun 3 is 0, when the weld depth is greater than 8mm and less than or equal to 12mm, the working quantity of the submerged arc welding gun 3 is 1, when the weld depth is greater than 12mm and less than or equal to 16mm, the working quantity of the submerged arc welding gun 3 is 2, and when the weld depth is greater than 16mm, the welding mechanism needs to perform secondary welding, and the plasma arc welding gun 2 does not work during the secondary welding process.

[0042] S3, the plasma arc welding gun 2 and the submerged arc welding gun 3 work simultaneously, the plasma arc welding gun 2 is located at the front end of the submerged arc welding gun 3, the plasma arc welding gun 2 performs single-sided welding and double-sided forming welding on the plate, and then the submerged arc welding gun 3 performs submerged arc welding on the weld.

[0043] When the welding device is used in practice, in step S1, the line connecting the welding gun heads of the two submerged arc welding guns 3 can be set along the weld, or the line connecting the welding gun heads of the two submerged arc welding guns 3 can be set perpendicular to the weld. The midpoint of the line connecting the welding gun heads of the two submerged arc welding guns 3 is located on the same straight line as the laser tracking probe 5 and the plasma arc welding gun 2, so as to form a wider eutectic pool, thereby welding a wider weld.

[0044] When the plate thickness is greater than 8 mm, a groove for submerged arc welding is provided at the weld of the plate to facilitate submerged arc welding of the plate.

[0045] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0046] Although this article uses more terms corresponding to the figure marks in the figures, it does not exclude the possibility of using other terms; these terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A composite welding device for plate welding, characterized in that: The hybrid welding device comprises a mounting frame (1), a plasma arc welding gun (2) for performing plasma arc welding on a plate, and at least one submerged arc welding gun (3) for performing submerged arc welding on the plate. The plasma arc welding gun (2) and the submerged arc welding gun (3) are sequentially mounted on the mounting frame (1) along the moving direction of the hybrid welding device via a connecting assembly (4), so that the plasma arc welding gun (2) and the submerged arc welding gun (3) can sequentially weld the same side of the plate to be welded. The connecting assembly (4) can slide and rotate relative to the mounting frame (1).

2. A composite welding device for plate welding according to claim 1, characterized in that: The connection assembly (4) comprises a sliding connection member (4-1) slidably connected to a mounting frame (1) and a rotating connection member (4-2) for mounting a plasma arc welding gun (2) or a submerged arc welding gun (3); the rotating connection member (4-2) is rotatably mounted on the sliding connection member (4-1) so that the tilt angle of the plasma arc welding gun (2) or the submerged arc welding gun (3) can be adjusted by rotating the connection member (4-2).

3. A composite welding device for plate welding according to claim 2, characterized in that: The sliding connection member (4-1) comprises a slider (4-3) slidably connected to the mounting frame (1), and a sleeve (4-4) used to be connected to the rotating connection member (4-2); the sleeve (4-4) is partially connected to the slider (4-3); an opening groove (4-5) for the diameter of the sleeve (4-4) is provided on the sleeve (4-4); and a locking member (4-6) adapted to the mounting frame (1) is installed on the slider (4-3) to lock the slider (4-3) on the mounting frame (1).

4. A composite welding device for plate welding according to claim 2, characterized in that: The rotating connection member (4-2) comprises a clamp (4-7) for rotatably mounting a plasma arc welding gun (2) or a submerged arc welding gun (3) and a welding gun sleeve (4-8) for mounting the plasma arc welding gun (2) or the submerged arc welding gun (3); the clamp (4-7) is rotatably connected to the sliding connection member (4-1), and the welding gun sleeve (4-8) is inserted into the clamp (4-7).

5. The hybrid welding device for plate welding according to claim 1, characterized in that: The submerged arc welding gun (3) is installed with two connection assemblies (4) at different heights, and the submerged arc welding gun (3) is adjustably installed on the mounting frame (1) via the two connection assemblies (4).

6. The hybrid welding device for plate welding according to claim 1, characterized in that: The mounting frame (1) is also provided with a laser tracking probe (5) for acquiring weld seam information, and the laser tracking probe (5) is arranged at the front end of the plasma arc welding gun (2).

7. A composite welding device for plate welding according to claim 1, characterized in that: A recovery pipe (6) for recovering flux is also mounted on the mounting frame (1), and the recovery pipe (6) is arranged at the rear of the submerged arc welding gun.

8. The welding method of the composite welding device for plate welding according to any one of claims 1 to 7, characterized in that: The following steps are included: S1, fixing the laser tracking probe (5), the plasma arc welding gun (2), and the submerged arc welding gun (3) on the welding device in sequence along the welding direction, and adjusting the spacing and angle relationship between the plasma arc welding gun (2) and the submerged arc welding gun (3) according to welding requirements, so as to achieve complete coupling, partial coupling, or complete separation of the eutectic pool according to welding requirements; S2, ensuring that the straight line where the laser tracking probe (5), the plasma arc welding gun (2), and the submerged arc welding gun (3) are located is on the same straight line as the weld of the plate to be welded, starting the welding device, obtaining weld information through the laser tracking probe (5), and the welding device calculating the movement route of the welding device and the number of operations of the submerged arc welding gun (3) based on the weld information; S3, the plasma arc welding gun (2) and the submerged arc welding gun (3) work simultaneously, the plasma arc welding gun (2) is located at the front end of the submerged arc welding gun (3), the plate is welded by the plasma arc welding gun (2), and then the weld is submerged arc welded by the submerged arc welding gun (3).

9. A composite welding method for plate welding according to claim 8, characterized in that: In step S2, the number of operations of the submerged arc welding gun (3) is positively correlated with the thickness of the plate.

10. A composite welding method for plate welding according to claim 8, characterized in that: The plate is provided with a groove for submerged arc welding at the weld of the plate according to the thickness of the plate.

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