Novel jointed board welding process

Abstract

The invention discloses a novel jointed board welding process which comprises the following steps: processing a steel plate to form a weld groove which is a single-sided groove; steel plate splicing, bottoming and submerged-arc welding are carried out, only front face welding is carried out on the steel plates, and after splicing welding is completed, splicing welding seams are formed; rolling into a circle; mechanical milling cutter back gouging is conducted on the back face of the splicing weld joint after rolling; and the back gouging position of the back face of the splicing weld joint is welded. According to the invention, a steel plate with the thickness of 40-100mm can be welded without turning over, dust pollution, light pollution and noise pollution caused by traditional carbon gouging back gouging and grinding are avoided, and the health of workers is protected. In addition, the novel jointed board welding process has the advantages that the welding qualification rate is increased, the welding workload is reduced, the using amount of welding materials is reduced, and the welding efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of welding, and particularly to a new type of panel welding process. Background Art

[0002] With the continuous development of green energy, wind power generation is gradually moving from offshore to deep sea, and the number of large-diameter wind turbine towers is increasing. Tower frames with a diameter of up to 7.5 meters are also gradually emerging. The length of such tower frames when unfolded can reach 23.3 meters. Generally, they need to be composed of two steel plates spliced and welded, and then the coiling operation is carried out after the two steel plates are spliced and welded.

[0003] The yield strength of the wind turbine tower frame material is 355 Mpa level, and generally Q355NE-Z35 material is used. The wall thickness of the bottom tower section is 40 - 100 mm. The manufacturing of a single tower section includes: the alignment of the panel welds, the backing welding by gas shielded arc welding (abbreviation: GMAW), the welding of the inner side of the panel welds, the turning over of the steel plate, the gouging of the root by manual carbon arc air gouging, the welding of the outer side of the panel welds, and the coiling; the backing welding of the closing weld by gas shielded arc welding, the welding of the inner side of the weld, and the welding of the outer side of the weld. Among them, in the panel welding stage of the panel welds, after the welding of the inner side of the weld is completed, the steel plate needs to be turned over for welding. In this process, there are the following disadvantages: 1. The greater the plate thickness, the heavier the self-weight of the steel plate, and the greater the difficulty of turning over, and a larger-tonnage overhead crane is required to assist in the turning-over operation;

[0004] 2. The bright arc light and noise greater than 120 decibels generated by carbon arc air gouging after turning over bring light pollution and noise pollution, affecting people's health;

[0005] 3. The dust generated by carbon gouging pollutes the environment, and the noise of weld grinding is also harmful to the human body;

[0006] 4. The workload is large and additional working hours will be generated;

[0007] 5. After the groove is manually ground, the dimensional deviation is large, the consistency is poor, and welding defects are likely to occur during welding, resulting in welding repair. Summary of the Invention

[0008] The purpose of the present invention is to provide a new type of panel welding process and operation method to solve one or more of the above-mentioned existing technical problems.

[0009] The present invention provides a new type of panel welding process, including the following steps:

[0010] Process the steel plate to form a weld groove;

[0011] Splice two steel plates and carry out submerged arc welding. Only the front side of the steel plate is welded. After the splicing welding is completed, a splicing weld is formed;

[0012] Coil;

[0013] After coiling, use a mechanical milling cutter head to root the back of the butt weld;

[0014] Weld at the root cleaning area on the back of the butt weld.

[0015] In some embodiments,

[0016] the thickness of the steel plate is 40 - 100 mm;

[0017] The weld groove formed by processing the steel plate is a single-sided groove, the groove angle is 35 - 45°, and the root face thickness is 0.1 times the thickness of the steel plate.

[0018] In some embodiments, the groove angle is 40°.

[0019] In some embodiments,

[0020] Before submerged arc welding, use gas metal arc welding to build the root on the front of the joint of the two steel plates;

[0021] Use spot welding for building the root.

[0022] In some embodiments,

[0023] When building the root, use a solid wire, the diameter of the solid wire is 1.2 - 1.6 mm, the welding current is 280 - 300 A, the welding voltage is 30 - 32 V, and the welding speed is 280 - 320 mm / min;

[0024] When submerged arc welding, use a wire with a diameter of 4 - 6 mm, the welding current is 600 - 750 A, the welding voltage is 29 - 33 V, and the welding speed is 380 - 440 mm / min.

[0025] In some embodiments,

[0026] When building the root, use the Atlantic solid wire CHW - 50C6SM, and the diameter of the solid wire is 1.2 mm;

[0027] When submerged arc welding, use the Atlantic SAW wire CHW - S3, the wire diameter is 4 or 5 mm, and the welding flux is the Atlantic welding flux CHF - 101.

[0028] In some embodiments, during the process of using a mechanical milling cutter head to root the back of the butt weld, use machining equipment, the back groove angle is 14 - 18°, the root of the weld has a circular transition, and the root cleaning depth is 10 - 17 mm.

[0029] In some embodiments, the back groove angle is 16° and the root cleaning depth is 15 mm.

[0030] In some embodiments, when welding at the root clearing area on the back of the butt weld, the wire diameter used is 2 - 6 mm, the welding current is 650 - 750 A, the welding voltage is 29 - 33 V, and the welding speed is 380 - 440 mm / min.

[0031] In some embodiments, when welding at the root clearing area on the back of the butt weld, the Atlantic SAW wire CHW - S3 is used, the wire diameter is 4 or 5 mm, and the welding flux is the Atlantic welding flux CHF - 101. The advantages of the novel panel welding process of the present invention are as follows:

[0032] 1. It can achieve welding of steel plates with a thickness of 40 - 100 mm without turning over, eliminating dust pollution, light pollution, and noise pollution caused by traditional carbon gouging root clearing and grinding, and protecting the health of workers; 2. It can achieve root clearing of the back of the quilting with a mechanical milling cutter head, eliminating manual carbon arc air gouging root clearing;

[0033] 3. The groove is processed by a mechanical milling cutter head on the back, improving the consistency of the root clearing weld, reducing welding defects caused by lack of fusion on the inner and outer sides, and improving the welding qualification rate;

[0034] 4. Adopting a small - angle groove design can reduce the welding workload, reduce the consumption of welding materials, and improve the welding efficiency;

[0035] 5. Spot welding is used on the front, and continuous backing can be carried out. Compared with the traditional method of intermittent assembly followed by welding the assembly welds together, there are fewer welding joints, which can effectively ensure the backing quality; 6. Eliminating carbon arc air gouging and adopting mechanical processing for root clearing can reduce the number of times the steel plate is heated, avoid the formation of cementite in the weld, improve the toughness of the weld, and increase the fatigue strength of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a flow chart of the novel panel welding process in some embodiments of the present invention;

[0037] Figure 2 It is a schematic diagram of the groove in some embodiments of the present invention;

[0038] Figure 3 It is a cross - sectional view of the front - side assembly weld after backing in some embodiments of the present invention;

[0039] Figure 4 It is a cross - sectional view of the front - side weld filling and capping in some embodiments of the present invention;

[0040] Figure 5 It is a cross - sectional view of the back - side root clearing in some embodiments of the present invention;

[0041] Figure 6 is Figure 5 an enlarged view of the C - C area in

[0042] Figure 7 Cross-sectional view of backfilling and capping in some embodiments of the present invention. Specific embodiments

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a 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 those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] Combined with Figures 1 to 7 As shown in the content, the new panel welding process can be applied to steel plates with a thickness W1 of 40 - 100 mm. This embodiment discloses a new panel welding process, which includes the following steps:

[0045] S1. Steel plate processing: Process two steel plates that need to be welded together, namely the first steel plate 1 and the second steel plate 2, to form a weld groove. The weld groove is a single-sided groove. After the two steel plates are joined, the groove angle is a°, and the value range of a can be 35 - 45. The root face thickness of the weld groove is W2, and W2 = 0.1 * W1 (for example, when W1 is 70 mm, W2 is 7 mm, and at this time, the value of a can be 40);

[0046] S2. Steel plate welding: The specific process includes:

[0047] S2.1. Join the two steel plates to form a front weld 3. The cross-section of the front weld 3 is as Figure 2 shown;

[0048] S2.2. Use gas metal arc welding (GMAW) to backfill the front weld 3 on the front side. Spot welding technology can be used in this process. A solid wire is used in this welding process. The diameter of the solid wire is 1.2 - 1.6 mm. For example, the Atlantic solid wire CHW-50C6SM has a diameter of 1.2 mm; the welding current is 280 - 300 A, the welding voltage is 30 - 32 V, and the welding speed is 280 - 320 mm / min. After backfilling, the cross-section of the front weld 3 is as Figure 3 shown;

[0049] S2.3. Perform submerged arc welding above the backing of the front weld seam 3. During this welding process, the wire diameter used is 4 - 6 mm. For example, when performing submerged arc welding, the Atlantic SAW wire CHW-S3 with a wire diameter of 4 or 5 mm is used, and the flux is the Atlantic flux CHF-101; the welding current is 600 - 750 A, the welding voltage is 29 - 33 V, and the welding speed is 380 - 440 mm / min; only the front side of the steel plate is welded. After the butt welding is completed, a butt weld seam is formed. The cross-section of the front weld seam 3 after submerged arc welding is as Figure 4 shown;

[0050] S3. Coil the circle. Only the front side needs to be welded, and the back side of the weld seam does not need to be welded. Then the steel plate can be coiled into a circle, and the weld seam will not crack. While for the traditional X-shaped groove, the steel plate needs to be turned over and welded on both sides before it can be coiled into a circle;

[0051] S4. After coiling the circle, perform root cleaning on the back side of the butt weld seam using a mechanical milling cutter head. During this process, a machining equipment (Miba brand edge milling machine) is used to form the back weld seam 4. The groove angle of the back weld seam is 14 - 18° (for example: 16°), the root of the back weld seam 4 has a circular arc transition, and the root cleaning depth is 10 - 17 mm (for example: 15 mm). The cross-section of the back weld seam is as Figure 5 and Figure 6 shown;

[0052] S5. Weld at the root cleaning area on the back side of the butt weld seam. During this welding process, the wire diameter used is 2 - 6 mm. For example, the Atlantic SAW wire CHW-S3 with a wire diameter of 4 or 5 mm is used, and the flux is the Atlantic flux CHF-101; continue to complete the filling and capping of the back groove. The welding current is 650 - 750 A, the welding voltage is 29 - 33 V, and the welding speed is 380 - 440 mm / min. The welding cross-section is as Figure 7 shown.

[0053] All the above undisclosed matters can be realized by the existing technology, so they will not be elaborated here.

[0054] The above new plate welding process can be applied not only to the longitudinal welds of the wind turbine tower, but also can be further extended to the circumferential welds of the wind turbine tower, and is also beneficial to the welding of steel pipe piles with large diameter and large thickness.

[0055] The above are only some embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the inventive concept of the present invention, several similar deformations and improvements can still be made, and these should also be regarded as the protection scope of the present invention.

Claims

1. A new type of panel welding process, characterized in that, It includes the following steps: Process the steel plate to form a weld groove. Splice two steel plates and carry out submerged arc welding. Only the front side of the steel plates is welded. After the butt welding is completed, a butt weld is formed. Coil the plates. After coiling, use a mechanical milling cutter head to root the back side of the butt weld. Weld at the root clearing area on the back side of the butt weld.

2. A novel butt welding process for plates according to claim 1, characterized in that the thickness of the steel plate is 40 - 100 mm; the weld groove formed by processing the steel plate is a single-sided groove, the groove angle is 35 - 45°, and the root face thickness is 0.1 times the thickness of the steel plate.

3. The novel panel welding process according to claim 2, characterized in that, The groove angle is 40°.

4. A novel butt welding process for plates according to claim 1, characterized in that Before carrying out submerged arc welding, carry out backing welding on the front side of the splicing of the two steel plates by using gas metal arc welding; Spot welding is used for backing welding.

5. A novel butt welding process for plates according to claim 4, characterized in that When carrying out backing welding, solid wire is used. The diameter of the solid wire is 1.2 - 1.6 mm, the welding current is 280 - 300 A, the welding voltage is 30 - 32 V, and the welding speed is 280 - 320 mm / min; When carrying out submerged arc welding, the diameter of the welding wire used is 4 - 6 mm, the welding current is 600 - 750 A, the welding voltage is 29 - 33 V, and the welding speed is 380 - 440 mm / min.

6. A novel butt welding process for plates according to claim 5, characterized in that When carrying out backing welding, Atlantic solid wire CHW - 50C6SM is used, and the diameter of the solid wire is 1.2 mm; When carrying out submerged arc welding, Atlantic SAW wire CHW - S3 is used, the diameter of the welding wire is 4 or 5 mm, and the welding flux is Atlantic welding flux CHF - 101.

7. A novel panel welding process according to claim 1, characterized in that, During the process of using a mechanical milling cutter head to root the back side of the butt weld, a machining device is adopted. The back side groove angle is 14 - 18°, the root of the weld has a circular arc transition, and the root clearing depth is 10 - 17 mm.

8. A novel jigsaw welding process according to claim 7, characterized in that, The back side groove angle is 16°, and the root clearing depth is 15 mm.

9. A novel panel welding process according to claim 1, characterized in that When welding at the root clearing area on the back side of the butt weld, the diameter of the welding wire used is 2 - 6 mm, the welding current is 650 - 750 A, the welding voltage is 29 - 33 V, and the welding speed is 380 - 440 mm / min.

10. A novel panel welding process according to claim 9, characterized in that, When welding at the root clearing area on the back side of the butt weld, Atlantic SAW wire CHW - S3 is used, the diameter of the welding wire is 4 or 5 mm, and the welding flux is Atlantic welding flux CHF - 101.

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