Welding method for high-strength steel of wind power generation tower drum

Abstract

The invention discloses a welding method for high-strength steel of a wind power generation tower. The welding method specifically comprises the following steps that S1, a welding groove is designed and prepared; s2, preparation before welding; s3, a welding process; s4, post-welding treatment and inspection are carried out; the invention relates to the technical field of wind power generation equipment. According to the high-strength steel welding method for the wind power generation tower drum, through the specific groove design and the welding technology, the welding quality is effectively improved, and welding defects such as cold cracks and air holes are reduced, so that the overall strength and durability of the wind power generation tower drum are improved, high-quality welding can be achieved without preheating, and energy and time cost needed by preheating is reduced. Meanwhile, by optimizing the welding process and the groove design, consumption of welding materials can be reduced, the manufacturing cost is further reduced, automatic or semi-automatic welding equipment such as a walking trolley and a roller carrier can be adopted in the welding method, the automation degree of welding is improved, manual operation is reduced, and therefore the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation equipment, and in particular to a high-strength steel welding method for a wind power generation tower. Background Art

[0002] Wind power generation refers to the conversion of wind kinetic energy into electrical energy. Wind is a pollution-free energy source. Using wind power to generate electricity is very environmentally friendly and can generate huge amounts of electricity. Therefore, more and more countries are paying more attention to wind power generation. As a clean and renewable energy source, wind energy is increasingly valued by countries around the world. It has huge reserves. The global wind energy is about 2.74×10^9MW, of which 2×10^7MW is usable, which is 10 times greater than the total amount of water energy that can be developed on the earth. Wind has been used by people for a long time, mainly through windmills to pump water, grind And now, people are interested in how to use wind to generate electricity, convert the kinetic energy of wind into mechanical kinetic energy, and then convert the mechanical energy into electrical kinetic energy. This is wind power generation. The principle of wind power generation is to use wind power to drive the windmill blades to rotate, and then increase the speed of rotation through a speed increaser to prompt the generator to generate electricity. According to current windmill technology, it can start generating electricity at a breeze speed of about three meters per second (the degree of a breeze). Wind power generation is becoming a trend in the world because wind power generation does not require the use of fuel and does not produce radiation or air pollution.

[0003] With the continuous development of wind power technology, the manufacturing requirements of wind power towers are increasing. As the main supporting structure of wind turbines, the material selection and welding process of the tower directly affect the performance and service life of the whole machine. Traditional welding methods often require preheating treatment, which not only increases energy consumption and cost, but may also introduce new defects.

[0004] Therefore, it is of great significance to develop an efficient, energy-saving, and preheating-free high-strength steel welding method. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a method for welding high-strength steel for a wind power tower, which solves the problems mentioned in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for welding high-strength steel of a wind power tower, specifically comprising the following steps:

[0007] S1. Welding groove design and preparation:

[0008] (1) Groove design: According to the wall thickness of the tower structural steel material, two different welding groove forms, double Y-type and compound double Y-type, are designed and processed;

[0009] (2) Material preparation: Select TMC high-strength steel that meets the requirements as the tower structure material, and prepare the minimum strength level submerged arc welding wire and matching flux required for welding;

[0010] S2. Preparation before welding:

[0011] (1) Groove processing: Use mechanical processing methods to accurately process the welding groove to ensure that the groove shape, size and surface quality meet the welding requirements;

[0012] (2) Cleaning: Thoroughly remove rust, oil, moisture and other harmful substances on the surface of the welding part to ensure the cleanliness of the welding area;

[0013] (3) Tool preparation: Design and manufacture appropriate welding tools to ensure the stability and positioning accuracy of the tower during welding;

[0014] S3. Welding process:

[0015] (1) Base welding: Use submerged arc welding process without preheating conditions for base welding;

[0016] (2) Alternating welding: Using the heat from the previous weld, the first filler weld is performed directly at the same position as the base weld, followed by the first external weld at the corresponding position on the outside of the tower.

[0017] (3) Multi-layer and multi-pass welding: filling welding and external welding are repeated in sequence;

[0018] (4) Welding parameter control: During the entire welding process, welding parameters, including current, voltage, and welding speed, must be strictly controlled to ensure weld quality. At the same time, the welding environment temperature and humidity must be monitored to prevent hydrogen embrittlement cracks in the weld;

[0019] S4. Post-weld treatment and inspection:

[0020] (1) Dehydrogenation treatment: After welding is completed, the weld needs to be dehydrogenated;

[0021] (2) Weld inspection: Perform visual inspection on the weld to ensure that the weld has a beautiful appearance and is free of undercut, pores, leaks, burn-through, slag inclusions and incomplete fusion defects;

[0022] (3) Repair welding and trimming: If defects are found in the weld, repair welding or trimming should be carried out in time to ensure that the weld quality meets the design requirements.

[0023] Preferably, in S1(1), the double Y-shaped welding groove includes a single angle groove surface processed on both sides of the groove blunt edge, and the compound double Y-shaped groove includes a double angle groove surface processed on both sides of the groove blunt edge.

[0024] Preferably, in S3(1), a selected welding wire and flux are used to form a stable initial welding layer at the root of the groove.

[0025] Preferably, in S3(3), after each layer of welding is completed, the slag needs to be removed and an appearance inspection needs to be performed to ensure that there are no defects before the next layer of welding can be performed.

[0026] Preferably, in S4(1), the dehydrogenation treatment is usually carried out at a temperature of 200 to 350° C. for more than 2 hours to reduce the hydrogen content in the weld.

[0027] Beneficial Effects

[0028] The present invention provides a high-strength steel welding method for a wind power tower. Compared with the prior art, it has the following beneficial effects:

[0029] The high-strength steel welding method for wind power towers specifically includes the following steps: S1, welding groove design and preparation; S2, pre-welding preparation; S3, welding process; S4, post-weld processing and inspection; through specific groove design and welding process, the welding quality is effectively improved, and welding defects such as cold cracks and pores are reduced, thereby improving the overall strength and durability of the wind power tower, and high-quality welding can be achieved without preheating, reducing the energy and time costs required for preheating. At the same time, by optimizing the welding process and groove design, the consumption of welding materials may be reduced, further reducing the manufacturing cost. The welding method may use automated or semi-automated welding equipment, such as a walking trolley, a roller frame, etc., to improve the automation of welding, reduce manual operations, and thus improve production efficiency;

[0030] In addition, through reasonable welding sequence and process arrangement, the production cycle can be shortened, and preheating welding can reduce energy consumption and carbon emissions, which is in line with the current development trend of energy conservation and environmental protection. At the same time, by optimizing the welding process and reducing spatter and smoke during welding, it is beneficial to improve the working environment and protect the ecological environment;

[0031] Wind turbine towers are key components of wind power generation equipment, and their structural stability is of vital importance. This welding method may ensure a firm and reliable connection between tower components through precise welding technology and groove design, thereby improving the structural stability of the entire tower. It may be suitable for wind turbine tower structural steel materials with different wall thicknesses and materials, and has strong adaptability and flexibility, which helps to meet the needs of different wind power projects and improve the market competitiveness of products. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a flow chart of the steps of the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1 The present invention provides two embodiments, a method for welding high-strength steel of a wind power tower, specifically including the following embodiments:

[0035] Example 1

[0036] S1. Welding groove design and preparation:

[0037] (1) Groove design: According to the wall thickness of the tower structural steel material, two different welding groove forms, double Y-type and compound double Y-type, are designed and processed;

[0038] (2) Material preparation: Select TMC high-strength steel that meets the requirements as the tower structure material, and prepare the minimum strength level submerged arc welding wire and matching flux required for welding;

[0039] S2. Preparation before welding:

[0040] (1) Groove processing: Use mechanical processing methods to accurately process the welding groove to ensure that the groove shape, size and surface quality meet the welding requirements;

[0041] (2) Cleaning: Thoroughly remove rust, oil, moisture and other harmful substances on the surface of the welding part to ensure the cleanliness of the welding area;

[0042] (3) Tool preparation: Design and manufacture appropriate welding tools to ensure the stability and positioning accuracy of the tower during welding;

[0043] S3. Welding process:

[0044] (1) Base welding: Use submerged arc welding process without preheating conditions for base welding;

[0045] (2) Alternating welding: Using the heat from the previous weld, the first filler weld is performed directly at the same position as the base weld, followed by the first external weld at the corresponding position on the outside of the tower.

[0046] (3) Multi-layer and multi-pass welding: filling welding and external welding are repeated in sequence;

[0047] (4) Welding parameter control: During the entire welding process, welding parameters, including current, voltage, and welding speed, must be strictly controlled to ensure weld quality. At the same time, the welding environment temperature and humidity must be monitored to prevent hydrogen embrittlement cracks in the weld;

[0048] S4. Post-weld treatment and inspection:

[0049] (1) Dehydrogenation treatment: After welding is completed, the weld needs to be dehydrogenated;

[0050] (2) Weld inspection: Perform visual inspection on the weld to ensure that the weld has a beautiful appearance and is free of undercut, pores, leaks, burn-through, slag inclusions and incomplete fusion defects;

[0051] (3) Repair welding and trimming: If defects are found in the weld, repair welding or trimming should be carried out in time to ensure that the weld quality meets the design requirements.

[0052] Example 2

[0053] S1. Welding groove design and preparation:

[0054] (1) Groove design: According to the wall thickness of the tower structural steel material, two different welding groove forms, double Y type and compound double Y type, are designed and processed. The double Y type welding groove includes a single angle groove processed on both sides of the groove blunt edge, while the compound double Y type groove includes a double angle groove processed on both sides of the groove blunt edge;

[0055] (2) Material preparation: Select TMC high-strength steel that meets the requirements as the tower structure material, and prepare the minimum strength level submerged arc welding wire and matching flux required for welding;

[0056] S2. Preparation before welding:

[0057] (1) Groove processing: Use mechanical processing methods to accurately process the welding groove to ensure that the groove shape, size and surface quality meet the welding requirements;

[0058] (2) Cleaning: Thoroughly remove rust, oil, moisture and other harmful substances on the surface of the welding part to ensure the cleanliness of the welding area;

[0059] (3) Tool preparation: Design and manufacture appropriate welding tools to ensure the stability and positioning accuracy of the tower during welding;

[0060] S3. Welding process:

[0061] (1) Base welding: Use submerged arc welding process without preheating to perform base welding, use selected welding wire and flux to form a stable initial welding layer at the root of the groove;

[0062] (2) Alternating welding: Using the heat from the previous weld, the first filler weld is performed directly at the same position as the base weld, followed by the first external weld at the corresponding position on the outside of the tower.

[0063] (3) Multi-layer and multi-pass welding: Filling welding and external welding are repeated in sequence. After each layer of welding is completed, the slag must be removed and the appearance must be inspected to ensure that there are no defects before the next layer of welding can be carried out;

[0064] (4) Welding parameter control: During the entire welding process, welding parameters, including current, voltage, and welding speed, must be strictly controlled to ensure weld quality. At the same time, the welding environment temperature and humidity must be monitored to prevent hydrogen embrittlement cracks in the weld;

[0065] S4. Post-weld treatment and inspection:

[0066] (1) Dehydrogenation treatment: After welding, the weld needs to be dehydrogenated. Dehydrogenation treatment is usually carried out at a temperature of 200-350°C for more than 2 hours to reduce the hydrogen content in the weld.

[0067] (2) Weld inspection: Perform visual inspection on the weld to ensure that the weld has a beautiful appearance and is free of undercut, pores, leaks, burn-through, slag inclusions and incomplete fusion defects;

[0068] (3) Repair welding and trimming: If defects are found in the weld, repair welding or trimming should be carried out in time to ensure that the weld quality meets the design requirements.

[0069] Wind turbine towers are key components of wind power generation equipment, and their structural stability is of vital importance. This welding method may ensure a firm and reliable connection between tower components through precise welding technology and groove design, thereby improving the structural stability of the entire tower. It may be suitable for wind turbine tower structural steel materials with different wall thicknesses and materials, and has strong adaptability and flexibility, which helps to meet the needs of different wind power projects and improve the market competitiveness of products.

[0070] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0071] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0072] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for welding high-strength steel of a wind power tower, characterized in that: The specific steps include: S1. Welding groove design and preparation: (1) Groove design: According to the wall thickness of the tower structural steel material, two different welding groove forms, double Y-type and compound double Y-type, are designed and processed; (2) Material preparation: Select TMC high-strength steel that meets the requirements as the tower structure material, and prepare the minimum strength level submerged arc welding wire and matching flux required for welding; S2. Preparation before welding: (1) Groove processing: Use mechanical processing methods to accurately process the welding groove to ensure that the groove shape, size and surface quality meet the welding requirements; (2) Cleaning: Thoroughly remove rust, oil, moisture and other harmful substances on the surface of the welding part to ensure the cleanliness of the welding area; (3) Tool preparation: Design and manufacture welding tools to ensure the stability and positioning accuracy of the tower during welding; S3. Welding process: (1) Base welding: Use submerged arc welding process without preheating conditions for base welding; (2) Alternating welding: Using the heat from the previous weld, the first filler weld is performed directly at the same position as the base weld, followed by the first external weld at the corresponding position on the outside of the tower. (3) Multi-layer and multi-pass welding: filling welding and external welding are repeated in sequence; (4) Welding parameter control: During the entire welding process, strictly control the welding parameters, including current, voltage, and welding speed, to ensure the quality of the weld. At the same time, monitor the welding environment temperature and humidity to prevent hydrogen embrittlement cracks in the weld; S4. Post-weld treatment and inspection: (1) Dehydrogenation treatment: After welding is completed, the weld is dehydrogenated; (2) Weld inspection: Perform visual inspection on the weld to ensure that the weld has a beautiful appearance and is free of undercut, pores, leaks, burn-through, slag inclusions and incomplete fusion defects; (3) Repair welding and trimming: If defects are found in the weld, repair welding or trimming should be carried out in time to ensure that the weld quality meets the design requirements.

2. A method for welding high-strength steel for a wind power tower according to claim 1, characterized in that: In S1(1), the double Y-shaped welding groove includes a single angle groove surface processed on both sides of the groove blunt edge, and the compound double Y-shaped groove includes a double angle groove surface processed on both sides of the groove blunt edge.

3. A method for welding high-strength steel for a wind power tower according to claim 1, characterized in that: In S3(1), a stable initial welding layer is formed at the root of the groove using the selected welding wire and flux.

4. A method for welding high-strength steel for a wind power tower according to claim 1, characterized in that: In S3(3), after each layer of welding is completed, the slag needs to be removed and the appearance needs to be inspected to ensure that there are no defects before the next layer of welding can be carried out.

5. A method for welding high-strength steel for a wind power tower according to claim 1, characterized in that: In the above-mentioned S4(1), the dehydrogenation treatment is usually carried out at a temperature of 200 to 350°C for more than 2 hours to reduce the hydrogen content in the weld.

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