Combined submerged arc horizontal position welding method

Abstract

The invention provides a combined submerged arc horizontal position welding method. The combined submerged arc horizontal position welding method comprises the step that gas shielded welding and submerged arc welding are adopted at the same time to conduct welding on the same side of the same welding line. And meanwhile, gas shielded welding and submerged-arc welding are adopted for welding the same side of the same welding seam, and the technical problem that in the prior art, in the building process of ships, steel structures and pressure vessels, when welding construction of transverse butt welding seams of straight shell plates at the vertical position is often conducted, the efficiency is extremely low is solved.

Description

Technical Field:

[0001] The present invention relates to the field of welding, and in particular to a combined submerged arc horizontal welding method. Background Art:

[0002] Currently, during the construction of ships, steel structures, and pressure vessels, welding construction of horizontal butt welds at the vertical position of flat shell plates is often encountered. Due to the influence of gravity on the welding molten pool at the horizontal butt joint, in the three-dimensional space direction, liquid metal and molten slag are prone to flow in the negative half-axis direction of the Z-axis, the X-axis direction, and the Y-axis direction (welding bead or lack of fusion welding defects will be generated), and it is difficult to control the weld shape and welding quality. To ensure the formation and quality of the horizontal butt weld, usually, the welding speed is increased and the multi-layer and multi-pass welding method is adopted to prevent the liquid metal and molten slag of the welding molten pool from flowing. This means that the number of welding passes of the horizontal butt weld is much more than that of the butt welds at other positions. Especially for thick horizontal butt welds, multiple round trips are required during the welding process, resulting in many weld joints and low welding efficiency. Although ordinary submerged arc horizontal welding improves the welding efficiency to a certain extent, only one weld can be welded in each welding pass, and the width and thickness of a single weld are limitedly increased, and the overall welding efficiency is not improved much.

[0003] There is an urgent need for a combined submerged arc horizontal welding method, which helps to solve the technical problem of extremely low efficiency during the welding construction of horizontal butt welds at the vertical position of flat shell plates that are often encountered during the construction of ships, steel structures, and pressure vessels in the prior art. Summary of the Invention:

[0004] In one embodiment, the present invention provides a combined submerged arc horizontal welding method, which simultaneously uses gas shielded welding and submerged arc welding to weld the same side of the same weld, helping to solve the technical problem of extremely low efficiency during the welding construction of horizontal butt welds at the vertical position of flat shell plates that are often encountered during the construction of ships, steel structures, and pressure vessels in the prior art.

[0005] The combined submerged arc horizontal welding method includes:

[0006] Simultaneously using gas shielded welding and submerged arc welding to weld the same side of the same weld.

[0007] In one embodiment, the gas shielded welding is carbon dioxide gas shielded welding.

[0008] In one embodiment, the gas shielded welding is carbon dioxide shielded welding with a solid core wire of a fine diameter of 1.2 mm, and the submerged arc welding is automatic submerged arc welding with a metal cored wire of a thick diameter of 2.4 mm.

[0009] In one embodiment, during welding, the gas shielded welding and the submerged arc welding are welded in sequence before and after, and are spaced apart by a predetermined distance.

[0010] In one embodiment, the distance between the two steel plates at the groove of the combined submerged arc horizontal welding method is 4 to 6 mm, and one of the steel plates has a groove with an inclination angle of 30 plus or minus 5 degrees.

[0011] In one embodiment, the welding parameters of the gas shielded welding are 180 to 200 A, the welding voltage is 24 to 26 V, it is welded in 2 layers and 3 passes, and the thickness of a single-pass weld is 4 to 5 mm.

[0012] In one embodiment, the submerged arc welding uses a fine-grained welding flux with a welding flux particle size of 50 to 60 mesh.

[0013] In one embodiment, simultaneously using gas shielded welding and submerged arc welding to weld the same side of the same weld includes:

[0014] Presetting the torch parameters and welding parameters of the gas shielded welding and the submerged arc welding, as well as the front and rear spacing of the torches;

[0015] Open the welding flux flow switch to cover the welding area with welding flux. At the same time, start the submerged arc welding, and the torches of the gas shielded welding and the submerged arc welding start welding simultaneously to complete the welding of one weld.

[0016] In one embodiment, the welding current of the gas shielded welding is 230 to 250 A, the welding voltage is 26 to 28 V, the welding current of the submerged arc welding is 350 to 400 A, the welding voltage is 31 to 33 V, the traveling speed of the welding carriage is 15 to 25 cm / min, the swing amplitude of the torch is 10 to 15 mm, and the swing frequency and dwell time can be adjusted flexibly.

[0017] In one embodiment, the torch of the submerged arc welding uses a three-dimensional motion control method for welding. Brief Description of the Drawings:

[0018] Figure 1 Schematic diagram of the welding groove form in one embodiment of the present invention;

[0019] Figure 2 Schematic diagram of the backing weld in another embodiment of the present invention;

[0020] Figure 3 Schematic diagram of the torch angle of the lower opening weld in another embodiment of the present invention;

[0021] Figure 4 Schematic diagram of the torch angle of the upper opening weld in another embodiment of the present invention;

[0022] Figure 5 Schematic diagram of the straight non-swinging bead welding method and weld shape in another embodiment of the present invention;

[0023] Figure 6Schematic diagram of the groove form for combined submerged arc horizontal welding in another embodiment of the present invention;

[0024] Figure 7 Schematic diagram of the backing weld for combined submerged arc horizontal welding in another embodiment of the present invention;

[0025] Figure 8 Schematic diagram of the first pass weld for combined submerged arc horizontal welding in another embodiment of the present invention;

[0026] Figure 9 Schematic diagram of the second pass weld for combined submerged arc horizontal welding in another embodiment of the present invention;

[0027] Figure 10 Schematic diagram of the welding wire feeding direction and weld shape for combined submerged arc horizontal welding in another embodiment of the present invention;

[0028] Figure 11 Schematic diagram of the decomposition of the wire feeding method for combined submerged arc horizontal welding in three - dimensional space in another embodiment of the present invention;

[0029] Figure 12 General schematic diagram of combined submerged arc horizontal welding in another embodiment of the present invention. Specific embodiments:

[0030] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] Reference is made herein to the various aspects and features of the present application with reference to the accompanying drawings.

[0032] These and other features of the present application will become apparent from the following description of the preferred forms of the embodiments given as non - limiting examples with reference to the accompanying drawings.

[0033] It should also be understood that although the present application has been described with reference to some specific examples, those skilled in the art can surely implement many other equivalent forms of the present application, which have the features as described in the claims and thus are all within the protection scope defined hereby.

[0034] When combined with the accompanying drawings, the above - mentioned and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description.

[0035] Specific embodiments of the present application will be described hereinafter with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the present application and can be implemented in various ways. Well-known and / or repetitive functions and structures are not described in detail to clarify the true intent based on the user's historical operations and to avoid obscuring the present application with unnecessary or redundant details. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but are merely a basis and representative basis for the claims to teach those skilled in the art to use the present application in substantially any suitable detailed structure in a variety of ways.

[0036] This specification may use the phrases "in one embodiment", "in another embodiment", "in yet another embodiment", or "in other embodiments", each of which may refer to one or more of the same or different embodiments according to the present application.

[0037] Figure 1 Schematic diagram of the groove form for welding in an embodiment of the present invention; Figure 2 Schematic diagram of the root pass weld in another embodiment of the present invention; Figure 3 Schematic diagram of the gun angle of the bottom weld in another embodiment of the present invention; Figure 4 Schematic diagram of the gun angle of the top weld in another embodiment of the present invention; Figure 5 Schematic diagram of the straight non-swinging bead welding method and the weld shape in another embodiment of the present invention;

[0038] Figure 6 Schematic diagram of the groove form of combined submerged arc horizontal welding in another embodiment of the present invention; Figure 7 Schematic diagram of the root pass weld of combined submerged arc horizontal welding in another embodiment of the present invention; Figure 8 Schematic diagram of the first pass weld of combined submerged arc horizontal welding in another embodiment of the present invention;

[0039] Figure 9 Schematic diagram of the second pass weld of combined submerged arc horizontal welding in another embodiment of the present invention; Figure 10 Schematic diagram of the welding bead direction and the weld shape of combined submerged arc horizontal welding in another embodiment of the present invention; Figure 11 Schematic diagram of the decomposition of the three-dimensional space welding bead method of combined submerged arc horizontal welding in another embodiment of the present invention; Figure 12 General schematic diagram of combined submerged arc horizontal welding in another embodiment of the present invention.

[0040] As Figures 1 to 12 shown, in one embodiment, a combined submerged arc horizontal welding method, the combined submerged arc horizontal welding method comprising:

[0041] Simultaneously performing gas shielded welding and submerged arc welding on the same side of the same weld.

[0042] In the prior art, the angle of the welding torch needs to be adjusted before welding each weld seam, and the welding construction process is cumbersome and inefficient. It overcomes the problem of using submerged arc horizontal welding equipment to weld the filling layer and capping layer weld seams after completing the root pass weld. The weld seam pattern where only one weld seam is welded in each welding pass. During the welding process, a flux baffle is installed on the lower surface of the slope welding joint in advance (perpendicular to the steel plate surface to prevent the flux from flowing away under the action of gravity). Preset the welding parameters, torch angle, torch spacing, wire extension length (dry elongation), torch oscillation speed, oscillation angle, oscillation amplitude, oscillation frequency, etc. of each of the two torches, as well as the traveling direction and traveling speed of the horizontal butt welding trolley, and simulate the welding process to observe the operation of the torch. Make corresponding adjustments if necessary to ensure that all parameters are suitable. Then operate the welding trolley back to the welding starting position. First, start the gas shielded welding torch and the welding trolley to start welding forward. When the submerged arc welding torch reaches the starting position, open the flux flow switch to cover the welding area with flux, and at the same time press the start button for submerged arc welding. At this time, the two torches weld forward simultaneously for the first pass of the weld seam.

[0043] In one embodiment, the gas shielded welding is carbon dioxide gas shielded welding.

[0044] In one embodiment, the gas shielded welding is solid wire carbon dioxide gas shielded welding with a fine diameter of 1.2 mm, and the submerged arc welding is submerged arc automatic welding with a metal cored wire with a thick diameter of 2.4 mm.

[0045] In one embodiment, during welding, the gas shielded welding and the submerged arc welding are welded successively before and after and are spaced a predetermined distance apart.

[0046] In one embodiment, the distance between the two steel plates of the groove of the combined submerged arc horizontal welding method is 4 to 6 mm, and one of the steel plates has a groove with an inclination angle of 30 plus or minus 5 degrees.

[0047] In the prior art, a bilateral asymmetric groove form is often used, with an upper groove angle of 20° and a lower groove angle of 10°. However, for the welding method of the new process, grooves need to be opened on both the upper and lower sides, and the workload of groove processing is large; there is a groove at the lower opening, and the high-temperature liquid metal and molten slag are likely to flow towards the groove surface direction, which is not conducive to increasing the thickness of a single weld seam, improving the welding quality and welding efficiency.

[0048] Due to the relatively small groove angle of the upper groove, the angle at which the welding torch tilts downward is limited, otherwise the distance between the welding torch and the upper edge of the welding groove is too close (see Figure 3 shown), which is likely to cause restricted movement or short circuit (resulting in the interruption of the welding process).

[0049] In one embodiment, the welding parameters of the gas shielded arc welding are 180 to 200 A, the welding voltage is 24 to 26 V, the welding is carried out in 2 layers and 3 passes, and the thickness of a single-pass weld is 4 to 5 mm.

[0050] In one embodiment, the submerged arc welding uses a fine-grained welding flux, and the particle size of the welding flux is 50 to 60 mesh.

[0051] In one embodiment, the simultaneous use of gas shielded arc welding and submerged arc welding to weld the same side of the same weld includes:

[0052] Preset the torch parameters, welding parameters of the gas shielded arc welding and the submerged arc welding, and the front-back distance between the torches.

[0053] Open the welding flux flow switch to cover the welding area with the welding flux. At the same time, start the submerged arc welding, and the torches of the gas shielded arc welding and the submerged arc welding start welding simultaneously to complete the welding of one weld pass.

[0054] Of course, there is more than one weld for welding. When using a non-swinging uniform straight-line bead movement method, the surface area of the molten pool is small, the thickness (from the root to the face direction) and width (from the lower edge to the upper edge) dimensions of a single-pass weld are small, the welding parameters are restricted, the number of back-and-forth welding times is large, and the welding efficiency is low. And because the surface area of the welding molten pool is small and the heat dissipation speed is slow, the molten pool is prone to flow and is likely to produce weld bead defects. For the straight non-swinging bead movement method and the weld shape, see Figure 5 as shown.

[0055] In one embodiment, the welding current of the gas shielded arc welding is 230 to 250 A, the welding voltage is 26 to 28 V, the welding current of the submerged arc welding is 350 to 400 A, the welding voltage is 31 to 33 V, the traveling speed of the welding carriage is 15 to 25 cm / min, the swing amplitude of the torch is 10 to 15 mm, and the swing frequency and dwell time can be adjusted flexibly.

[0056] The surface of the weld of the gas shielded arc welding is not covered with welding slag. There is no need to clean the slag between two welds in the same pass, and the welding is carried out synchronously and continuously. The weld of the submerged arc welding covers most of the weld of the gas shielded arc welding. For the second pass of the combined submerged arc horizontal welding, see Figure 9 as shown. When reaching the end of the weld, first turn off the gas shielded arc welding torch. When the submerged arc welding torch also reaches the end position, then turn off the welding flux switch and the submerged arc welding switch to complete the welding construction of the second pass of the combined submerged arc horizontal welding. The subsequent welding is similar to the welding method of the second pass. The traveling speed of the welding carriage gradually decreases, and the swing amplitude of the torch gradually increases. When welding a large-thickness horizontal butt weld, as the number of welding passes increases, when the welding groove is wide enough (≥30 mm), the welding of the welds in the same layer needs to be carried out in 2 passes or multiple passes. The welding parameters and methods are similar to the single-layer single-pass welding method.

[0057] The surface of the weld of the gas shielded arc welding is not covered with welding slag. There is no need to clean the slag between the two welds in the same pass, and welding is carried out synchronously and continuously. The weld of the submerged arc welding covers most of the weld of the gas shielded arc welding. For the first pass of the combined submerged arc horizontal welding, see Figure 8 as shown. When reaching the end of the weld, first turn off the gas shielded arc welding gun. When the submerged arc welding gun also welds to the end position, then turn off the flux switch and the submerged arc welding switch to complete the welding construction of the first pass of the combined submerged arc horizontal welding.

[0058] The surface of the weld of the gas shielded arc welding is not covered with welding slag. There is no need to clean the slag between the two welds in the same pass, and welding is carried out synchronously and continuously. After completing one pass of welding, only the surface of the submerged arc horizontal weld needs to be thoroughly cleaned once to carry out the welding of the next pass of weld.

[0059] In one embodiment, the welding gun of the submerged arc welding adopts a three-dimensional motion control method for welding.

[0060] The technical problem to be solved by the present invention is to carry out the combined submerged arc horizontal welding operation at the horizontal butt joint position by using two different welding guns on the same welding trolley and simultaneously adopting two different welding methods. The front welding gun uses CO2 gas shielded welding with a solid wire of fine diameter (1.2 mm) for welding, and the rear welding gun uses submerged arc automatic welding with a metal cored wire of thick diameter (2.4 mm) for welding. The two welding guns are set at a certain distance and carry out the welding construction of three-dimensional strip running in the front and back simultaneously.

[0061] The front and rear two welding guns of the combined submerged arc horizontal welding are respectively fixed on the same horizontal welding trolley through their respective electric control swinging crossbeams (the whole crossbeam can be adjusted for inclination in three-dimensional space). The two welding guns can carry out three-dimensional reciprocating motion (i.e., three-dimensional welding strip running) while the welding trolley is moving. When the welding gun runs the strip in the positive direction, its moving direction is the positive direction of the X axis, and the negative directions of the Y axis and the Z axis, that is, the welding gun moves forward, outward and downward; when the welding gun runs the strip in the negative direction, its moving direction is the negative direction of the X axis, and the positive directions of the Y axis and the Z axis, that is, the welding gun moves backward, inward and upward. For the welding strip running direction and the weld shape of the combined submerged arc horizontal welding, see Figure 10 as shown. The three-dimensional welding strip running method can change the shape of the welding molten pool, make it extend along the three-dimensional space direction, make the liquid welding molten pool lengthen and become larger, which is beneficial to the heat dissipation of the molten pool, control the temperature and shape of the molten pool, prevent the liquid metal from flowing, improve the weld forming quality, can appropriately increase the welding current and welding voltage, increase the thickness and width of a single-pass weld, reduce the number of welding round trips, and improve the welding construction efficiency.

[0062] Three-dimensional welding strip running control method for combined submerged arc horizontal welding

[0063] The two welding torches before and after the combined submerged arc horizontal welding are respectively fixed on the same horizontal welding trolley through their respective electronically controlled swinging crossbeams (the welding torch fixed on the crossbeam before rotation only makes reciprocating strip running movements along the X-axis direction). The whole crossbeam first rotates in the vertical direction (the X-axis and Z-axis plane), with the origin of coordinates as the rotation center, and rotates clockwise by a certain angle (α); then the whole crossbeam rotates in the horizontal direction (the X-axis and Y-axis plane), with the origin of coordinates as the rotation center, and rotates clockwise by a certain angle (β). The rotation action of the whole crossbeam can be electronically controlled. After the rotation is completed, the welding torches fixed on the crossbeam can perform three-dimensional space welding strip running movements. For the decomposition of the three-dimensional space welding strip running method of the combined submerged arc horizontal welding, see Figure 11 as shown. For the overall schematic diagram of the combined submerged arc horizontal welding, see Figure 12 as shown.

[0064] The method for controlling the strip running speed of the welding torch in the X-axis direction of the combined submerged arc horizontal welding.

[0065] The strip running speed V of the welding torch in the X-axis direction (relative to the weld) of the combined submerged arc horizontal welding is jointly affected by the traveling speed (Vo) of the horizontal welding trolley and the component speed (Vbx) of the swinging speed (Vb) of the crossbeam in the X-axis direction. Vbx is jointly affected by the overall vertical rotation angle α and the horizontal rotation angle β of the crossbeam. Vbx = Vb × cosα × cosβ. V_pos = Vb_pos × cosα × cosβ + Vo; V_neg = Vb_neg × cosα × cosβ - Vo. In order to ensure that V_pos = V_neg = V (in the X-axis direction, the strip running speeds of the welding torch relative to the weld are equal in magnitude), Vb_pos = (V - Vo) / (cosα × cosβ), Vb_neg = (V + Vo) / (cosα × cosβ). First, set Vo, the overall vertical rotation angle α and the horizontal rotation angle β of the crossbeam. When the required strip running speed V of the welding torch in the X-axis is input, the electronic control system will automatically calculate Vb_pos and Vb_neg according to the formula respectively and issue the instruction. Adjust the swinging frequency, swinging amplitude, dwell time and other parameters of the crossbeam, and the simulated welding switch can be turned on to perform simulated welding walking and swinging, and observe and fine-tune various speed and swinging parameters in the simulated state until it is appropriate.

[0066] The purpose of the present invention is to increase the weld thickness and weld width during single-pass welding of the horizontal butt weld, reduce the number of welding round trips and the number of weld slag cleaning times, and improve the welding quality and welding efficiency of the horizontal butt weld.

[0067] This technology belongs to the field of welding technology.

[0068] Beneficial effects:

[0069] Compared with the prior art, the present invention has the following advantages:

[0070] 1. Adopt a groove form with a 30±5° opening on one side (only the upper side) and a 4 - 6 mm gap left at the root. The groove processing workload is small. This groove form can effectively prevent the high-temperature liquid metal and molten slag from flowing towards the groove surface direction, which is conducive to controlling the welding quality and improving the welding efficiency.

[0071] 2. After completing the welding of the backing weld, use the horizontal welding method with a double-gun combination to weld the filling layer and capping layer welds. For each welding pass, 2 welds can be continuously welded. There is no need to clean the slag between the 2 welds, and the single-pass welding construction efficiency is high.

[0072] 3. After adjusting the welding torch angle, there is no need to adjust the welding torch angle again before welding each weld. The welding construction process is simple and the construction efficiency is high.

[0073] 4. Since the groove angle of the upper groove is relatively large, the angle limit of the downward tilt of the welding torch is reduced, which is not easy to cause restricted movement or short circuit (resulting in the interruption of the welding process).

[0074] 5. Adopt a wire feeding method with three-dimensional space oscillation. The surface area of the liquid molten pool is large. The thickness (from the root to the surface direction) and width (from the lower edge to the upper edge) dimensions of a single-pass weld are large. The available welding parameter range is wide. The width and thickness of the weld in a single pass are large, and the number of round-trip weldings is small, so the welding efficiency is high. And because the surface area of the welding molten pool is large and the heat dissipation speed is fast, the liquid molten pool is not easy to flow, avoiding the generation of weld bead defects and ensuring good welding quality.

[0075] 6. Since the combined submerged arc welding is adopted, 2 welds can be welded for each pass. The surface of the previous weld is not covered with welding slag, and the 2 welds can be continuously welded without slag cleaning. It is only necessary to thoroughly clean the welding slag on the surface of the submerged arc horizontal weld once before welding the next pass. The number of times of cleaning the welding slag is small, the time is short, the labor intensity is small, and the work efficiency is high.

[0076] 7. Adopt a metal cored flux-cored submerged arc welding wire with a medium diameter (2.4 mm), which can be wound into a small-diameter disc-shaped welding wire, and the construction process is flexible and convenient. The medium-diameter metal cored flux-cored submerged arc welding wire effectively increases the upper limit of the available welding current. When welding with a large current, the position of the welding wire from the contact tip to the welding molten pool is not easy to turn red and soften (the rigidity becomes poor) due to the serious resistance heat effect, avoiding sagging and bending under the action of gravity and preventing the deviation of the arc position, thus improving the weld quality.

[0077] 8. Adopt a metal cored flux-cored submerged arc welding wire with a medium diameter (2.4 mm). According to different steels to be welded, the internal flux composition and ratio of the welding wire can be flexibly adjusted, which can meet the welding requirements of a variety of steels, especially convenient for the welding of special materials.

[0078] The above embodiments are only exemplary embodiments of the present invention and are not used to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions within the essence and protection scope of the present invention, and such modifications or equivalent substitutions should also be regarded as falling within the protection scope of the present invention.

Claims

1. A combined submerged arc horizontal welding method, characterized in that: The combined submerged arc horizontal welding method comprises: Gas shielded welding and submerged arc welding are used simultaneously to weld the same side of the same weld.

2. The combined submerged arc horizontal welding method according to claim 1, characterized in that: The gas shielded welding is carbon dioxide gas shielded welding.

3. The combined submerged arc horizontal welding method according to claim 2, characterized in that: The gas shielded welding is carbon dioxide shielded welding with a solid welding wire of thin diameter 1.2 mm, and the submerged arc welding is automatic submerged arc welding with a metal powder core welding wire of thick diameter 2.4 mm.

4. The combined submerged arc horizontal welding method according to claim 3, characterized in that: During welding, the gas shielded welding and the submerged arc welding are performed sequentially and spaced apart by a predetermined distance.

5. The combined submerged arc horizontal welding method according to claim 4, characterized in that: The distance between the two steel plates at the groove of the combined submerged arc horizontal welding method is 4 to 6 mm, and one of the steel plates has a groove with an inclination angle of 30 plus or minus 5 degrees.

6. The combined submerged arc horizontal welding method according to claim 5, characterized in that: The welding parameters of the gas shielded welding are 180 to 200A, the welding voltage is 24 to 26V, the welding is divided into 2 layers and 3 passes, and the thickness of a single pass weld is 4 to 5 mm.

7. The combined submerged arc horizontal welding method according to claim 6, characterized in that: The submerged arc welding adopts fine-grained flux, and the flux particle size is 50 to 60 meshes.

8. The combined submerged arc horizontal welding method according to claim 7, characterized in that: The simultaneous use of gas shielded welding and submerged arc welding to weld the same side of the same weld includes: Presetting welding gun parameters and welding parameters of the gas shielded welding and the submerged arc welding, as well as the front and rear spacing of the welding gun; The flux discharge switch is turned on to cover the welding area with flux, and the submerged arc welding is started at the same time. The gas shielded welding and the submerged arc welding torches start welding at the same time to complete the welding of a weld.

9. The combined submerged arc horizontal welding method according to claim 8, characterized in that: The welding current of the gas shielded welding is 230 to 250A, and the welding voltage is 26 to 28V. The welding current of the submerged arc welding is 350 to 400A, and the welding voltage is 31 to 33V. The travel speed of the welding carriage is 15 to 25cm / min, and the swing amplitude of the welding gun is 10 to 15mm. The swing frequency and dwell time can be flexibly adjusted.

10. The combined submerged arc horizontal welding method according to claim 9, characterized in that: The submerged arc welding torch adopts a three-dimensional motion control method for welding.

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