Welding process of offshore wind power platform supporting plate

Abstract

The invention discloses a welding process for an offshore wind power platform supporting plate, and relates to the technical field of welding, the welding process comprises the working procedures of preparation before welding, positioned welding, liner removal and automatic trolley welding, a K-shaped groove is formed in the supporting plate, the angle of the groove is 45 degrees, the size of a truncated edge is 0-2mm, a welding gap is reserved during assembling, a ceramic round rod liner is placed at the root of the groove, and the welding process is completed. And the groove and the blunt edge are subjected to flame heating, flux-cored arc welding is adopted for welding the small groove side, after a welding seam is cooled, the ceramic round bar gasket is removed, and an automatic welding trolley body and flux-cored wire arc welding are adopted for welding the large groove side. According to the welding method, the ceramic round rod gasket is adopted and makes close contact with a weldment in the welding process, it is guaranteed that a root weld joint is well formed, the flux-cored wire arc welding and automatic welding trolley technology is adopted for the large groove side, and the welding efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a welding process for an offshore wind power platform support plate. Background Art

[0002] Wind turbine piles are important structural parts for supporting wind turbine heads. With the increase of offshore wind power, the megawatt is getting bigger and bigger, and the thickness of the steel plates of the supporting auxiliary components is increasing. Among them, the platform support plate is an important auxiliary component, and the steel plate thickness reaches 90mm. The joint form is difficult to weld and the welding quality requirements are high. The main solution currently used is double-sided welding. The welding solution is as follows: Figure 1 As shown, a K-type groove is used with a groove form of 1 / 3-2 / 3. The 2 / 3 large groove side is welded first. Welding is done with flux-cored arc welding in the PA flat welding position. It is manually operated, and the welding is difficult, requires high manual skills, and has a large welding workload.

[0003] After welding one side, the weldment needs to be turned over. This operation not only wastes time, but also poses serious safety hazards. Then, carbon arc gouging is used to clean the root at 1 / 3 of the groove depth; then the other side is welded. However, double-sided welding increases the complexity of the operation, and it is necessary to ensure that the quality of welding on both sides is consistent, otherwise it may affect the overall welding quality. With this process, carbon arc gouging is required to clean the root, which produces a lot of smoke and noise, affecting the physical and mental health of workers and causing certain pollution to the environment; the quality of carbon arc gouging also affects the quality of weld welding, and carbon arc gouging requires high skills of workers; the carbon arc gouging process also consumes a lot of energy; both welding and carbon arc gouging require manual operation, which has high requirements for personnel, slow efficiency, and high overall cost.

[0004] Based on this, a welding process for an offshore wind power platform support plate is now provided, which can eliminate the drawbacks of the existing device. Summary of the invention

[0005] The purpose of the present invention is to provide a welding process for an offshore wind power platform support plate, so as to solve the problem that the main solution adopted in the prior art is that the weld is a K-shaped groove with a groove form of 1 / 3-2 / 3, and the 2 / 3 large groove side is welded first, and after welding one side, it is turned over, and then the root is cleaned by air planing; and then the other side is welded. The pile body is connected to the support plate, and the unsafe factor of turning over increases. At the same time, turning over, air planing, and grinding also reduce production efficiency and increase a lot of additional work.

[0006] To achieve the above object, the present invention provides the following technical solutions: A welding process for an offshore wind power platform support plate comprises the following steps: Step 1: Preparation before welding, prefabrication of pile body and cutting of support plate, and processing of K-shaped groove at one end of the support plate; Assemble the support plate on the prefabricated pile body and reserve a welding gap. After assembly, place a ceramic round rod liner at the root of the groove; Flame heat the groove and blunt edge.

[0007] Step 2: Positioning welding, use arc welding to weld the small groove side, and weld in an overhead position; The groove where positioning welding has been completed is filled with flux-cored arc welding.

[0008] Step 3: Remove the liner. After the weld has cooled, remove the ceramic rod liner.

[0009] Step 4: Automatic trolley welding, using automatic welding trolley body and flux-cored wire arc welding to weld the large groove side.

[0010] On the basis of the above technical solution, the present invention also provides the following optional technical solution: In an optional solution: the upper groove angle of the support plate is 45 degrees, and the gap between the pile body and the support plate is 3 times the length of the blunt edge of the support plate.

[0011] In an optional solution: the cross-sectional diameter of the ceramic round rod liner is larger than the gap between the pile body and the support plate.

[0012] In an optional solution, the ceramic round rod liner is made of alumina ceramic material.

[0013] In an optional scheme: in step 2, the arc welding wire is a flux-cored wire, the arc welding shielding gas is ≥99.8% CO2, the welding speed is 180mm / min-320mm / min, and the welding gas flow rate is 15L / min-25L / min.

[0014] In an optional solution, the ceramic round rod liner is removed by tapping at both ends to loosen the ceramic round rod liner and separate it from the weld.

[0015] In an optional solution: in step 4, the welding speed is 220-360 mm / min, and the shielding gas flow rate is 15-25 L / min.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention adopts a ceramic round rod gasket, which is in close contact with the weldment during the welding process, thereby ensuring that the root weld is well formed and improving the welding quality and strength; the large groove side adopts flux-cored arc welding plus an automatic welding trolley process, which improves welding efficiency, reduces labor intensity and labor costs, and reduces the requirements for manual welding skills; a series of processes such as lifting caused by turning over are reduced, and the welding efficiency is greatly improved; at the same time, for different wall thicknesses, different groove angles can be selected according to the situation, reducing the welding filling amount and operation time, reducing production costs, and improving operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of existing double-sided welding.

[0018] Figure 2 It is a schematic diagram of the groove form and assembly of the present invention.

[0019] Figure 3 This is a schematic diagram of placing the ceramic liner of the present invention.

[0020] Figure 4 It is a schematic diagram of welding a small groove side in the overhead welding position of the present invention.

[0021] Figure 5 This is a schematic diagram of removing the ceramic round rod liner according to the present invention.

[0022] Figure 6 This is a schematic diagram of welding a large groove side using an automatic welding trolley main body in the present invention.

[0023] Notes on the reference numerals: 11 pile body, 12 support plate, 13 ceramic round rod liner, 14 automatic welding trolley body. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0025] In one embodiment, Figure 2-Figure 6 As shown, a welding process for an offshore wind power platform support plate includes: step 1 pre-welding preparation, step 2 positioning welding, step 3 removing the gasket and step 4 automatic trolley welding.

[0026] Among them, the preparation before welding is to first prefabricate the pile body 11 and cut the support plate 12, process the support plate 12 according to the CNC drawing, and process the groove at one end of the support plate 12, and perform degreasing and impurity removal processes at the welding point to ensure the appearance quality of the weld. Specifically, the support plate 12 is made of 90mm thick steel plate, the material grade is EN 10025-3 S355NL, the groove on the support plate 12 is K-shaped, the groove angle is 45 degrees, and the blunt edge size is 0-2mm.

[0027] Then, the support plate 12 with the grooved groove is assembled on the prefabricated pile body 11, and a welding gap is reserved during assembly, and it is necessary to pay attention to that the gap needs to be kept consistent. After assembly, a ceramic round rod liner 13 is placed at the root of the groove, and the ceramic round rod liner 13 fits tightly with the groove surface. Specifically, when the pile body 11 and the support plate 12 are assembled, a 6 cm assembly gap is reserved, and the cross-sectional diameter of the ceramic round rod liner 13 is 10 mm. The ceramic round rod liner 13 is a ceramic material with an alumina ceramic material as a backing. By strictly controlling the assembly gap between the pile body 11 and the support plate 12, the situation where the welding point is too concave during welding is avoided.

[0028] Finally, preheating treatment is carried out, and the groove and blunt edge are flame heated. The heating temperature meets the welding process requirements. Specifically, the preheating temperature is 80℃-120℃.

[0029] Among them, for positioning welding, arc welding is used to weld the small groove side; for overhead welding, specifically, flux-cored arc welding is used for positioning welding at the weld, the wire diameter of flux-cored arc welding is 1.2mm, and the shielding gas used is ≥99.8% CO2. The welding is in the overhead welding position, the welding current is 180A-260A, the voltage is 27V-34V, the welding speed is 180mm / min-320mm / min, and the gas flow rate during welding is 15L / min-25L / min.

[0030] Finally, flux-cored arc welding is used to fill the groove where positioning welding has been completed. The welding wire is flux-cored wire with a diameter of 1.2mm. The shielding gas used is ≥99.8% CO2. The welding current is 180A-260A, the welding voltage is 27V-34V, the welding speed is 180mm / min-320mm / min, and the gas flow rate is 15L / min-25L / min. Use flux-cored arc welding to complete the welding of the small groove side in the overhead welding position.

[0031] Among them, the gasket is removed, and after the weld is cooled, the ceramic round rod gasket 13 is removed; specifically, to remove the gasket, it is only necessary to gently tap the ceramic round rod gasket 13 to remove it. After the ceramic round rod gasket 13 is removed, the root weld is well formed, and there is no need for air gouging and grinding, which reduces the air gouging and grinding processes, reduces the noise hazards and dust pollution caused by air gouging and grinding, reduces costs, and improves efficiency.

[0032] Among them, the automatic trolley welding adopts the automatic welding trolley body 14 and flux-cored arc welding to weld the large groove side. Specifically, the gas shielded automatic welding trolley body 14 is used to fill and cover the flat welding position. The welding wire diameter is 1.2mm, and the welding parameters are: current 200-280A, voltage 27-35A, welding speed 220-360mm / min, shielding gas flow rate 15-25L / min, welding wire rod extension 20-28mm, and the automatic welding trolley body 14 adopts existing components. After welding, the automatic welding trolley body 14 is removed to complete the welding, which reduces the flipping operation process, saves labor and operation time, reduces costs, improves efficiency, and reduces the safety hazards caused by flipping and lifting.

[0033] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A welding process for an offshore wind power platform support plate, characterized in that: The following steps are involved: Step 1: Preparation before welding: prefabrication of the pile body (11) and cutting of the support plate (12), and processing of a K-shaped groove at one end of the support plate (12); Assemble the support plate (12) on the prefabricated pile body (11) and reserve a welding gap. After assembly, place a ceramic round rod liner (13) at the root of the groove; Flame heating of the groove and blunt edge; Step 2: Positioning welding, use arc welding to weld the small groove side, and weld in an overhead position; Use flux-cored arc welding to fill the groove where positioning welding has been completed; Step 3: Removing the liner: After the weld is cooled, the ceramic round rod liner (13) is removed; Step 4: Automatic trolley welding: using the automatic trolley body (14) and flux-cored wire arc welding to weld the large groove side.

2. The welding process of the offshore wind power platform support plate according to claim 1, characterized in that: The upper slope angle of the support plate (12) is 45 degrees, and the gap between the pile body (11) and the support plate (12) is 3 times the length of the blunt edge of the support plate (12).

3. The welding process of the offshore wind power platform support plate according to claim 1 is characterized in that: The cross-sectional diameter of the ceramic round rod liner (13) is larger than the gap between the pile body (11) and the support plate (12).

4. The welding process of the offshore wind power platform support plate according to claim 1, characterized in that: The ceramic round rod liner (13) is made of alumina ceramic material.

5. The welding process of the offshore wind power platform support plate according to claim 1, characterized in that: In step 2, the arc welding wire is a flux-cored wire, the arc welding shielding gas is ≥99.8% CO2, the welding speed is 180mm / min-320mm / min, and the welding gas flow rate is 15L / min-25L / min.

6. The welding process of an offshore wind power platform support plate according to claim 1, characterized in that: The ceramic round rod liner (13) is removed by tapping at both ends, so that the ceramic round rod liner (13) is loosened and separated from the weld.

7. The welding process of an offshore wind power platform support plate according to claim 1, characterized in that: In step 4, the welding speed is 220-360 mm / min, and the shielding gas flow rate is 15-25 L / min.

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