Carbon-arc-free gouging process for tower of wind generating set

Abstract

The invention relates to the technical field of wind generating set tower welding, and discloses a carbon-arc-free gouging process for a wind generating set tower. The carbon-arc-free gouging process for the tower of the wind generating set comprises the following steps: welding preparation; welding and assembling; a tool position; welding a groove surface; according to the method, the advantages that a weld joint is flat and smooth, the welding efficiency is high, the quality is stable, and open arc stimulation and noise pollution are avoided can be achieved through the back-gouging-free full penetration welding method, a groove needs to be formed in advance in a cold machining mode when the carbon arc gouging-free full penetration welding method is implemented, and therefore the shape and size of the groove can be controlled easily; the defect that the shape and the size of an opened groove are not easy to control during traditional back chipping is avoided; the back-gouging-free full penetration welding method is simple in process and stable in welding quality, outer side groove gas shielded welding is adopted for bottoming, then inner side submerged arc automatic welding and outer side submerged arc automatic welding are adopted, and full penetration and high internal quality of a welding seam are effectively guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of tower welding of a wind generator set, in particular to a carbon-free arc gouging process for a tower of a wind generator set. Background Art

[0002] At present, carbon arc gouging welding is commonly used in the processing and manufacturing of wind turbine towers in wind turbine towers. However, carbon arc gouging welding to clean the root weld will cause the weld to be repeatedly heated, causing the component to deform and the grain size of the weld to increase. The grain size of the weld and the parent material will lead to a decrease in the weld strength. In addition, the carburized layer on the groove surface also needs to be cleaned after carbon arc gouging. In addition, there are dust pollution, high noise, arc radiation, and high skill and responsibility requirements for the operator. The shape of the welding groove after gouging is very irregular, which also makes it difficult to ensure the welding quality of the root weld; the gouging process is labor-intensive; therefore, in view of the current situation, it is now necessary to improve it. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a carbon-free arc gouging process for the tower of a wind turbine generator set, which effectively solves the problem that the current use of carbon arc gouging to weld wind turbine towers will cause repeated heating of the welds to cause deformation of the components and increase the grain size of the welds, while the grain size of the welds and the parent material will lead to reduced weld strength, and the carburized layer on the surface of the groove also needs to be cleaned after the carbon arc gouging. In addition, there are dust pollution, high noise, arc radiation, and high requirements on the operator's skills and sense of responsibility. The shape of the welding groove after gouging is very irregular, which also makes it difficult to ensure the welding quality of the root weld; and the gouging process has high labor intensity.

[0004] To achieve the above object, the present invention provides the following technical solution: a carbon-free arc gouging process for a wind turbine tower, characterized in that it comprises the following steps:

[0005] Step 1: Welding preparation: prepare the bevel of the two sides of the wind turbine tower with a bevel of 45-75 degrees and a blunt edge thickness of 3-5mm. Use gas cutting or mechanical processing to prepare the bevel. Clean the bevel surface and other parts to be welded and the oil, rust and other dirt within 100mm on both sides until the metallic luster is exposed. The welding environment temperature should be greater than 0℃. Steel plates with a thickness greater than 30mm must be fully preheated. The two parts must be heated to 80-120℃ within 100mm from the weld.

[0006] Step 2: Welding pair, use carbon dioxide gas shielded welding to perform positioning welding on the groove side, the weld leg height K = 3-5mm, the weld length is 50mm every 400mm, the pair gap is 2-3mm, and the gap exceeds 3mm. Use carbon dioxide gas shielded welding for repair welding. The weld leg height K = 3-4mm, the place with small blunt edge needs to be marked separately and repaired accordingly to avoid burning through. The arc starter plate length is 80-120mm. The groove angle and blunt edge preparation are the same as the parent material requirements;

[0007] Step 3: Tooling position. In order to ensure the reasonableness of the weld penetration and weld shape coefficient of the wind turbine tower and prevent the occurrence of welding cracks, when welding the wind turbine tower, use multiple sets of wedges to evenly support the left and right sides of the wind turbine tower so that the welding wire is on the angle bisector. During welding, both sides of the wind turbine tower are evenly heated and fully integrated with the parent material. After the group is qualified, the wind turbine tower is hoisted onto the V-shaped frame and welded by submerged arc automatic welding.

[0008] Step 4: Bevel surface welding. When welding the root weld of the bevel surface, multi-layer, multi-pass, double-sided submerged arc welding is used to achieve full penetration welding without root cleaning, with small deformation. It should be noted that the first weld on the back of the welding bevel should be able to ensure good fusion of the blunt edge and positioning weld. After welding one main weld, weld another main weld on the inside of the wind turbine tower according to the above method. Correct it after welding, and align the center of the welding wire with the root of the weld; when welding non-bevel surfaces, it is necessary to ensure that the welding current is 750-800A, the welding voltage is 34-36V, and the welding speed is 30-34cm / min; when welding the bevel surface cover weld, it is necessary to ensure that the welding current is 650-750A, the welding voltage is 32-34V, and the welding speed is 30-34cm / min.

[0009] Preferably, the multi-layer and multi-pass welding proposed in step 4 refers to the welding performed by depositing more than two weld layers to complete the entire weld, and each layer of the weld is completed by one weld pass. When the weld is larger than the welding process, multi-layer welding is required, and multi-layer welding is often accompanied by multi-pass welding.

[0010] Preferably, the double-sided submerged arc welding proposed in step 4 is achieved by welding on both sides of the workpiece at the same time so that the two sides are fused at the same time, thereby achieving the welding effect. Its working principle is to use tungsten electrode gas shielded arc to generate high temperature to melt the surface of the workpiece, and then add molten metal to fill the weld to complete the welding.

[0011] Preferably, the welding environment temperature proposed in step 1, when the welding environment temperature is lower than 0°C, should be heated to above 15°C within 100mm on both sides of the welding point before welding construction.

[0012] Preferably, the full penetration welding proposed in step 4 is a phenomenon in which the weld is fully penetrated by a certain welding process or a special welding rod during the welding process, that is, the root of the weld joint is fully penetrated.

[0013] Preferably, the gas cutting groove proposed in step 1 is that the flame preheats the material to the ignition point at the starting point of cutting, and then an oxygen flow is injected to cause the metal material to violently oxidize and burn, and the generated oxide slag is blown away by the air flow to form an incision.

[0014] Preferably, the mechanically processed bevel proposed in step one is milled out by a milling machine. The milling machine adopts the working principle of high-speed milling with a cutter disc and is a welding auxiliary equipment specially used to open weld bevels for steel plates before welding. The milling machine uses a high-speed rotating milling cutter to accurately cut, grind and chamfer the edges of metal plates.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention adopts the full penetration welding method without root cleaning to achieve the advantages of smooth welds, high welding efficiency and stable quality, no open arc stimulation and noise pollution. When the full penetration welding method without carbon arc air gouging is implemented, the groove needs to be opened in advance by cold processing, which is conducive to controlling the shape and size of the groove, avoiding the disadvantage that the shape and size of the groove opened during traditional root cleaning are difficult to control.

[0016] 2. The no-cleaning full penetration welding method has a simple process and stable welding quality. It uses gas shielded welding to prime the outer groove, and then automatic submerged arc welding on the inside and the outside, which effectively ensures the full penetration of the weld and high internal quality, and solves the problems of difficult root cleaning and difficult control of welding deformation in cylindrical high-quality full penetration welding butt welds. According to the current market application, the no-cleaning welding technology has the advantages of smooth welds and high welding efficiency.

[0017] 3. By controlling the groove angle, size, weld interface gap and misalignment parameters of the cylindrical welded steel plate, it is possible to avoid the problem of submerged arc welding easily penetrating the weld when double-sided grooves are opened on medium and thin plates in the prior art, and solve the problems of difficult penetration of medium and thick plates, large consumption of welding materials and low welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0019] In the attached picture:

[0020] Figure 1 This is a framework diagram of the carbon-free arc gouging process for the tower of a wind turbine generator set of the present invention; DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] See also Figure 1 The carbon-free arc gouging process for the tower of a wind turbine generator set of the present invention comprises the following steps:

[0023] Step 1: Welding preparation: prepare the bevel of the two sides of the wind turbine tower with a bevel of 45-75 degrees and a blunt edge thickness of 3-5mm. Use gas cutting or mechanical processing to prepare the bevel. Clean the bevel surface and other parts to be welded and the oil, rust and other dirt within 100mm on both sides until the metallic luster is exposed. The welding environment temperature should be greater than 0℃. Steel plates with a thickness greater than 30mm must be fully preheated. The two parts must be heated to 80-120℃ within 100mm from the weld.

[0024] Step 2: Welding pair, use carbon dioxide gas shielded welding to perform positioning welding on the groove side, the weld leg height K = 3-5mm, the weld length is 50mm every 400mm, the pair gap is 2-3mm, and the gap exceeds 3mm. Use carbon dioxide gas shielded welding for repair welding. The weld leg height K = 3-4mm, the place with small blunt edge needs to be marked separately and repaired accordingly to avoid burning through. The arc starter plate length is 80-120mm. The groove angle and blunt edge preparation are the same as the parent material requirements;

[0025] Step 3: Tooling position. In order to ensure the reasonableness of the weld penetration and weld shape coefficient of the wind turbine tower and prevent the occurrence of welding cracks, when welding the wind turbine tower, use multiple sets of wedges to evenly support the left and right sides of the wind turbine tower so that the welding wire is on the angle bisector. During welding, both sides of the wind turbine tower are evenly heated and fully integrated with the parent material. After the group is qualified, the wind turbine tower is hoisted onto the V-shaped frame and welded by submerged arc automatic welding.

[0026] Step 4: Bevel surface welding. When welding the root weld of the bevel surface, multi-layer, multi-pass, double-sided submerged arc welding is used to achieve full penetration welding without root cleaning, with small deformation. It should be noted that the first weld on the back of the welding bevel should be able to ensure good fusion of the blunt edge and positioning weld. After welding one main weld, weld another main weld on the inside of the wind turbine tower according to the above method. Correct it after welding, and align the center of the welding wire with the root of the weld; when welding non-bevel surfaces, it is necessary to ensure that the welding current is 750-800A, the welding voltage is 34-36V, and the welding speed is 30-34cm / min; when welding the bevel surface cover weld, it is necessary to ensure that the welding current is 650-750A, the welding voltage is 32-34V, and the welding speed is 30-34cm / min.

[0027] Among them, the multi-layer and multi-pass welding proposed in step 4 refers to the welding performed by depositing more than two welding layers to complete the entire weld, and each layer of the weld is completed by one weld pass. The welding performed by depositing more than two welding layers to complete the entire weld, when the weld is relatively large relative to the welding process, multi-layer welding is required, and multi-layer welding is often associated with multi-pass welding. The double-sided submerged arc welding proposed in step 4 is achieved by welding on both sides of the workpiece at the same time, so that the two sides are fused at the same time, thereby achieving the welding effect. Its working principle is to use tungsten electrode gas shielded arc to generate high temperature to melt the surface of the workpiece, and then add molten metal to fill the weld to complete the connection. The welding environment temperature proposed in step 1, when the welding environment temperature is lower than 0°C, should be within 100mm range on both sides of the welding. The material is heated to above 15°C in the enclosure before welding. The full penetration welding proposed in step 4 is a phenomenon in which a certain welding process or special welding rod is used during the welding process to make the weld completely penetrated, that is, the root of the weld joint is completely penetrated. The gas cutting groove proposed in step 1 is that the flame preheats the material to the ignition point at the starting point of the cutting, and then an oxygen flow is sprayed to cause the metal material to violently oxidize and burn, and the generated oxide slag is blown away by the air flow to form an incision. The mechanical processing groove proposed in step 1 is milled out by a milling machine. The milling machine adopts the working principle of high-speed milling of the cutter disc. It is a welding auxiliary equipment specially used to open a weld groove for the steel plate before welding. The milling machine uses a high-speed rotating milling cutter to accurately cut, grind and chamfer the edge of the metal plate.

[0028] Embodiment 1

[0029] The carbon-free arc gouging process for the tower of a wind turbine generator set includes the following steps:

[0030] Step 1: Welding preparation: prepare the bevels of the two sides of the wind turbine tower with a bevel angle of 45 degrees and a blunt edge thickness of 3mm by gas cutting or mechanical processing. Clean the bevel surface and other parts to be welded and the oil, rust and other dirt within 100mm on both sides until the metallic luster is exposed. The welding environment temperature should be greater than 0℃. Steel plates with a thickness of more than 30mm must be fully preheated. The two parts must be heated to 100℃ within 100mm from the weld.

[0031] Step 2: Welding pair, use carbon dioxide gas shielded welding to perform positioning welding on the groove side, the weld leg height K = 3mm, the weld length is 50mm every 400mm, the pair gap is 2mm, and the gap exceeds 3mm. Use carbon dioxide gas shielded welding for repair welding. The weld leg height K = 3mm, the place with small blunt edge needs to be marked separately and repaired accordingly to avoid burning through. The arc starter plate length is 80mm. The groove angle and blunt edge preparation are the same as the parent material requirements;

[0032] Step 3: Tooling position. In order to ensure the reasonableness of the weld penetration and weld shape coefficient of the wind turbine tower and prevent the occurrence of welding cracks, when welding the wind turbine tower, use multiple sets of wedges to evenly support the left and right sides of the wind turbine tower so that the welding wire is on the angle bisector. During welding, both sides of the wind turbine tower are evenly heated and fully integrated with the parent material. After the group is qualified, the wind turbine tower is hoisted onto the V-shaped frame and welded by submerged arc automatic welding.

[0033] Step 4: Bevel surface welding. When welding the root weld of the bevel surface, multi-layer, multi-pass, double-sided submerged arc welding is used to achieve full penetration welding without root cleaning and small deformation. It should be noted that the first weld on the back of the welding bevel should be able to ensure good fusion of the blunt edge and positioning weld. After welding one main weld, weld another main weld on the inside of the wind turbine tower according to the above method. Correct it after welding and align the center of the welding wire with the root of the weld. When welding non-bevel surfaces, it is necessary to ensure that the welding current is 750A, the welding voltage is 34V, and the welding speed is 30cm / min; when welding the bevel surface cover weld, it is necessary to ensure that the welding current is 650A, the welding voltage is 32V, and the welding speed is 30cm / min.

[0034] By adopting the full penetration welding method without root cleaning, the advantages of smooth welds, high welding efficiency and stable quality, and no open arc stimulation and noise pollution can be achieved. When the full penetration welding method without carbon arc gouging is implemented, the groove must be opened in advance by cold processing, which is conducive to controlling the shape and size of the groove, avoiding the disadvantage that the shape and size of the groove opened during traditional root cleaning are difficult to control.

[0035] Embodiment 2

[0036] The carbon-free arc gouging process for the tower of a wind turbine generator set includes the following steps:

[0037] Step 1: Welding preparation: prepare the bevel of the two sides of the wind turbine tower with a bevel of 65 degrees and a blunt edge thickness of 4mm by gas cutting or mechanical processing. Clean the oil, rust and other dirt on the bevel surface and other parts to be welded and within 100mm on both sides until the metallic luster is exposed. The welding environment temperature should be greater than 0℃. Steel plates with a thickness of more than 30mm must be fully preheated. The two parts must be heated to 120℃ within 100mm from the weld.

[0038] Step 2: Welding pair, use carbon dioxide gas shielded welding to perform positioning welding on the groove side, the weld leg height K = 4mm, the weld length is 50mm every 400mm, the pair gap is 3mm, and the gap exceeds 3mm. Use carbon dioxide gas shielded welding for repair welding. The weld leg height K = 4mm, the place with small blunt edge needs to be marked separately and repaired accordingly to avoid burning through. The arc starter plate length is 120mm. The groove angle and blunt edge preparation are the same as the parent material requirements;

[0039] Step 3: Tooling position. In order to ensure the reasonableness of the weld penetration and weld shape coefficient of the wind turbine tower and prevent the occurrence of welding cracks, when welding the wind turbine tower, use multiple sets of wedges to evenly support the left and right sides of the wind turbine tower so that the welding wire is on the angle bisector. During welding, both sides of the wind turbine tower are evenly heated and fully integrated with the parent material. After the group is qualified, the wind turbine tower is hoisted onto the V-shaped frame and welded by submerged arc automatic welding.

[0040] Step 4: Bevel surface welding. When welding the root weld of the bevel surface, multi-layer, multi-pass, double-sided submerged arc welding is used to achieve full penetration welding without root cleaning, with small deformation. It should be noted that the first weld on the back of the welding bevel should be able to ensure good fusion of the blunt edge and positioning weld. After welding one main weld, weld another main weld on the inside of the wind turbine tower according to the above method. Correct it after welding, and align the center of the welding wire with the root of the weld; when welding non-bevel surfaces, it is necessary to ensure that the welding current is 800A, the welding voltage is 35V, and the welding speed is 33cm / min; when welding the bevel surface cover weld, it is necessary to ensure that the welding current is 750A, the welding voltage is 34V, and the welding speed is 34cm / min.

[0041] The above method adopts the full penetration welding method without root cleaning, which has the advantages of simplicity and stable welding quality. The outer groove is primed with gas shielded welding, and then the inner submerged arc automatic welding and the outer submerged arc automatic welding are used to effectively ensure the full penetration of the weld and high internal quality, solving the problem of difficult root cleaning of cylindrical high-quality full penetration welding butt welds and difficult control of welding deformation. According to the current market application, the no-root cleaning welding technology has the advantages of smooth welds and high welding efficiency.

[0042] Embodiment 3

[0043] The carbon-free arc gouging process for the tower of a wind turbine generator set includes the following steps:

[0044] Step 1: Welding preparation: prepare the bevels of the two sides of the wind turbine tower with a bevel of 75 degrees and a blunt edge thickness of 5mm by gas cutting or mechanical processing. Clean the bevel surface and other parts to be welded and the oil, rust and other dirt within 100mm on both sides until the metallic luster is exposed. The welding environment temperature should be greater than 0℃. Steel plates with a thickness of more than 30mm must be fully preheated. The two parts must be heated to 120℃ within 100mm from the weld.

[0045] Step 2: Welding pair, use carbon dioxide gas shielded welding to perform positioning welding on the groove side, the weld leg height K = 5mm, the weld length is welded 50mm every 400mm, the pair gap is 3mm, and the gap exceeds 3mm. Use carbon dioxide gas shielded welding for repair welding. The weld leg height K = 4mm, the place with small blunt edge needs to be marked separately and repaired accordingly to avoid burning through. The arc starter plate length is 120mm. The groove angle and blunt edge preparation are the same as the parent material requirements;

[0046] Step 3: Tooling position. In order to ensure the reasonableness of the weld penetration and weld shape coefficient of the wind turbine tower and prevent the occurrence of welding cracks, when welding the wind turbine tower, use multiple sets of wedges to evenly support the left and right sides of the wind turbine tower so that the welding wire is on the angle bisector. During welding, both sides of the wind turbine tower are evenly heated and fully integrated with the parent material. After the group is qualified, the wind turbine tower is hoisted onto the V-shaped frame and welded by submerged arc automatic welding.

[0047] Step 4: Bevel surface welding. When welding the root weld of the bevel surface, multi-layer, multi-pass, double-sided submerged arc welding is used to achieve full penetration welding without root cleaning and small deformation. It should be noted that the first weld on the back of the welding bevel should be able to ensure good fusion of the blunt edge and positioning weld. After welding one main weld, weld another main weld on the inside of the wind turbine tower according to the above method. Correct it after welding and align the center of the welding wire with the root of the weld. When welding non-bevel surfaces, it is necessary to ensure that the welding current is 750A, the welding voltage is 34V, and the welding speed is 30cm / min; when welding the bevel surface cover weld, it is necessary to ensure that the welding current is 750A, the welding voltage is 34V, and the welding speed is 34cm / min.

[0048] By controlling the groove angle, size, weld interface gap and misalignment parameters of the cylindrical welded steel plate, not only can the problem of submerged arc welding easily penetrating the weld when double-sided grooves are opened on medium and thin plates in the existing technology be avoided, but also the problems of difficult penetration of medium and thick plates, large consumption of welding materials and low welding efficiency can be solved.

[0049] 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.

[0050] 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. Carbon-free arc gouging process for wind turbine tower, characterized by: The following steps are involved: Step 1: Welding preparation: prepare the bevel of the two sides of the wind turbine tower with a bevel of 45-75 degrees and a blunt edge thickness of 3-5mm. Use gas cutting or mechanical processing to prepare the bevel. Clean the bevel surface and other parts to be welded and the oil, rust and other dirt within 100mm on both sides until the metallic luster is exposed. The welding environment temperature should be greater than 0℃. Steel plates with a thickness greater than 30mm must be fully preheated. The two parts must be heated to 80-120℃ within 100mm from the weld. Step 2: Welding pair, use carbon dioxide gas shielded welding to perform positioning welding on the groove side, the weld leg height K = 3-5mm, the weld length is 50mm every 400mm, the pair gap is 2-3mm, and the gap exceeds 3mm. Use carbon dioxide gas shielded welding for repair welding. The weld leg height K = 3-4mm, the place with small blunt edge needs to be marked separately and repaired accordingly to avoid burning through. The arc starter plate length is 80-120mm. The groove angle and blunt edge preparation are the same as the parent material requirements; Step 3: Tooling position. In order to ensure the reasonableness of the weld penetration and weld shape coefficient of the wind turbine tower and prevent the occurrence of welding cracks, when welding the wind turbine tower, use multiple sets of wedges to evenly support the left and right sides of the wind turbine tower so that the welding wire is on the angle bisector. During welding, both sides of the wind turbine tower are evenly heated and fully integrated with the parent material. After the group is qualified, the wind turbine tower is hoisted onto the V-shaped frame and welded by submerged arc automatic welding. Step 4: Bevel surface welding. When welding the root weld of the bevel surface, multi-layer, multi-pass, double-sided submerged arc welding is used to achieve full penetration welding without root cleaning, with small deformation. It should be noted that the first weld on the back of the welding bevel should be able to ensure good fusion of the blunt edge and positioning weld. After welding one main weld, weld another main weld on the inside of the wind turbine tower according to the above method. Correct it after welding, and align the center of the welding wire with the root of the weld; when welding non-bevel surfaces, it is necessary to ensure that the welding current is 750-800A, the welding voltage is 34-36V, and the welding speed is 30-34cm / min; when welding the bevel surface cover weld, it is necessary to ensure that the welding current is 650-750A, the welding voltage is 32-34V, and the welding speed is 30-34cm / min.

2. The carbon-free arc gouging process for a wind turbine tower according to claim 1 is characterized in that: The multi-layer and multi-pass welding proposed in step 4 refers to welding performed by depositing more than two weld layers to complete the entire weld, and each layer of the weld is completed by one weld pass. When the weld is larger than the welding process, multi-layer welding is required, and multi-layer welding often involves multiple passes.

3. The carbon-free arc gouging process for a wind turbine tower according to claim 2 is characterized in that: The double-sided submerged arc welding proposed in step 4 is to achieve the welding effect by welding on both sides of the workpiece at the same time so that the two sides are fused at the same time. Its working principle is to use tungsten electrode gas shielded arc to generate high temperature to melt the surface of the workpiece, and then add molten metal to fill the weld to complete the welding.

4. The carbon-free arc gouging process for a wind turbine tower according to claim 1 is characterized in that: The welding environment temperature mentioned in step 1, when the welding environment temperature is lower than 0°C, should be heated to above 15°C within 100mm on both sides of the welding point before welding construction.

5. The carbon-free arc gouging process for a wind turbine tower according to claim 1 is characterized in that: The full penetration welding proposed in step 4 is a phenomenon in which the weld is fully penetrated through a certain welding process or a special welding rod during the welding process, that is, the root of the weld joint is fully penetrated.

6. The carbon-free arc gouging process for a wind turbine tower according to claim 1 is characterized in that: The gas cutting groove proposed in step 1 is that the flame preheats the material to the ignition point at the starting point of cutting, and then injects an oxygen flow to cause the metal material to violently oxidize and burn, and the generated oxide slag is blown away by the air flow to form an incision.

7. The carbon-free arc gouging process for a wind turbine tower according to claim 1 is characterized in that: The mechanical processing groove proposed in the step 1 is to mill out the groove by a milling machine. The milling machine adopts the working principle of high-speed milling of the cutter disc and is a welding auxiliary equipment specially used to open the weld groove of the steel plate before welding. The milling machine uses a high-speed rotating milling cutter to accurately cut, grind and chamfer the edge of the metal plate.

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