Method for controlling deformation of large open-cell board fcb welding

Abstract

The application discloses a deformation control method for FCB welding of large-opening plate, which comprises the following steps: S1, embedding a patch plate in the opening of a large-opening plate to form a pre-assembled plate; S2, turning the pre-assembled plate upside down to make the back face of the pre-assembled plate face upward, and welding the butt joint between the patch plate and the large-opening plate on the back face of the pre-assembled plate; S3, turning the pre-assembled plate upside down to make the front face of the pre-assembled plate face upward, and butting the pre-assembled plate with at least one butt plate, and then welding the butt joint between the pre-assembled plate and the butt plate by using FCB method; and S4, after the FCB welding is completed, welding the butt joint between the patch plate and the large-opening plate on the front face of the pre-assembled plate.

Description

Technical Field

[0001] This application relates to the field of welding technology for large-aperture plates, and more particularly to a method for controlling deformation during FCB welding of large-aperture plates. Background Technology

[0002] In the field of shipbuilding and large steel structure manufacturing, the welding process for patch plates is currently mostly as follows: First, the patch plate is fully assembled and welded on both sides of the opening using submerged arc welding, making it a whole with the main plate; then, the completed plate is hoisted to the FCB (copper backing submerged arc welding) assembly line and butt-welded with other plates.

[0003] However, the welding process for this type of patch plate currently used has significant drawbacks, severely impacting the final welding quality and production efficiency. First, because all welds on both sides of the patch plate are completed before the main FCB assembly, the concentrated welding stress generated by these welds causes significant uneven deformation in the large opening area, whose rigidity has already been severely weakened by the opening, resulting in a loss of flatness at the opening. Second, when the large opening area deforms due to the above reasons, it cannot be ensured that the copper backing can effectively lift and tightly adhere to the back of the weld during FCB welding, and this lack of adhesion directly affects the welding quality. Third, to solve the problem of poor weld formation, a large amount of rework work, including carbon planing, grinding, and re-welding, must be performed. This not only increases additional material and labor costs but also severely slows down the production cycle of this highly efficient automated FCB production line, affecting overall manufacturing efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a deformation control method for FCB welding of large-aperture plates, which can solve the above-mentioned problems existing in the prior art.

[0005] To achieve the above objectives, this application adopts the following technical solution: As one aspect of the present invention, a method for controlling deformation during FCB welding of large-aperture plates is provided, comprising: Step S1: Pre-assemble the patch panel onto the opening of the large-aperture board to form a pre-assembled panel; Step S2: Turn the pre-assembled plate over so that the reverse side is facing up, and weld the butt joint between the patch plate and the large-aperture plate on the reverse side of the pre-assembled plate; Step S3: Turn the pre-assembled panel over so that its front side is facing up and align it with at least one mating plate. Weld the joint between the pre-assembled panel and the mating plate using the FCB method. Step S4: After completing the FCB welding, weld the butt joint between the patch plate and the large-aperture plate on the front side of the pre-assembled plate.

[0006] Preferably, in step S2, the butt joint between the patch plate and the large-aperture plate includes a straight section and a corner arc section. The straight section is welded to the back of the pre-assembled plate using submerged arc welding, and the corner arc section is welded to the back of the pre-assembled plate using carbon dioxide gas shielded welding.

[0007] Preferably, in step S4, before welding, the joint between the patch plate and the large-aperture plate is cleaned by reverse buckling on the front side of the pre-assembled plate.

[0008] Preferably, in step S2, before welding the butt joint between the patch plate and the large-aperture plate on the reverse side of the pre-assembled plate, the following steps are further included: The butt joint between the patch plate and the large-aperture plate is fixed by positioning welding on the front side of the pre-assembled plate; The weld length of the tack weld is not less than 50mm, and the weld spacing of the tack weld is 300mm to 400mm.

[0009] Preferably, the thickness of the large-aperture plate is 12mm to 50mm; wherein the bevel between the patch plate and the large-aperture plate is an I-bevel.

[0010] Preferably, the patch plate is located in the internal region of the large-aperture plate.

[0011] Preferably, the patch plate is located at the end or edge region of the large-aperture plate.

[0012] Preferably, in step S2, when welding the joint between the patch plate and the large-aperture plate on the reverse side of the pre-assembled plate, welding starts from the middle of the joint and proceeds symmetrically to both ends of the joint.

[0013] Preferably, the large-aperture plate has a prefabricated splicing seam, and the opening of the patch plate in the large-aperture plate spans the prefabricated splicing seam.

[0014] Preferably, the method further includes the following steps after step S3 and before step S4: On the front side of the pre-assembled panel, weld the sections of the pre-assembled panel seams that are not interrupted by the openings of the large-aperture plate.

[0015] The beneficial effects of this application are as follows: The deformation control method for FCB welding of large-aperture plates provided in this application places the main heat input step of FCB welding before welding the front side of the patch plate, so that the welding stress can be released preferentially at the stage when the structural rigidity is at its maximum. This can fundamentally avoid the serious uneven deformation caused by welding stress concentration in the rigid and weak area of ​​the large opening, and significantly improve the overall flatness of the plate after welding.

[0016] This application first welds the back side of the patch plate, providing continuous back support for subsequent FCB welding. This ensures that the copper backing can fit tightly against the weld during FCB welding, resulting in uniform and aesthetically pleasing weld formation on both sides and stable and reliable weld joint quality.

[0017] This application reduces welding deformation and weld quality problems without adding extra steps, directly reducing rework costs and improving production efficiency. Attached Figure Description

[0018] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a block diagram illustrating the deformation control method for FCB welding of large-aperture plates provided in Embodiment 1 of this application.

[0020] Figure 2 A schematic diagram of the welding process for insert plates inside or at the ends of plates with large openings is shown.

[0021] Figure 3 A schematic diagram of the welding process between the large-aperture plate containing the patch plate and the butt plate is shown.

[0022] Figure 4 A schematic diagram of the welding process between the patch plate and the front side of the large-aperture plate is shown.

[0023] Figure 5 This diagram illustrates the welding process on the reverse side when the patch plate is placed on the prefabricated splice seam of a large-aperture plate.

[0024] Figure 6 The diagram shows the welding process flow for other butt joints besides the patch plate butt joint when the patch plate is located on the prefabricated splice joint of the large-aperture plate.

[0025] Figure 7 The diagram shows a schematic of the welding process on the front side when the patch plate is located on the prefabricated splice seam of the large-aperture plate.

[0026] In the picture: 100, Patch panel; 200, Large opening panel; 300, Butt joint panel; 401, Butt joint between patch panel and large opening panel; 402, Butt joint between pre-assembled panel and butt joint panel; 500, Precast panel joint. Detailed Implementation

[0027] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] Figure 1 This is a block diagram illustrating the deformation control method for FCB welding of large-aperture plates provided in Embodiment 1 of this application. Figure 1 As shown, this embodiment provides a deformation control method for FCB welding of large-aperture plates, including: Step S1: Pre-assemble the patch panel 100 onto the opening of the large-hole panel 200 to form a pre-assembled panel; Step S2: Turn the pre-assembled plate over so that the reverse side is facing up, and weld the butt joint 401 between the patch plate 100 and the large opening plate 200 on the reverse side of the pre-assembled plate; Step S3: Turn the pre-assembled plate over so that its front side is facing up and mate it with at least one mating plate 300. Weld the mating seam 402 between the pre-assembled plate and the mating plate 300 using the FCB method. Step S4: After completing the FCB welding, weld the butt joint 401 between the patch plate 100 and the large opening plate 200 on the front side of the pre-assembled plate.

[0031] The deformation control method for FCB welding of large-aperture plates provided in this embodiment can effectively control the deformation of large-aperture plates during the welding process and improve the welding quality by adjusting the welding sequence of the patch plate splicing.

[0032] Furthermore, because this embodiment effectively controls the deformation of the plate at the large opening and improves the forming of the weld on the reverse side, the welding quality is more stable and reliable. It avoids the situation where stress generated by welding the two sides of the patch plate causes unevenness at the plate opening, which could prevent the copper backing from fitting properly to the weld after being lifted during FCB welding, ultimately leading to excessive weld reinforcement or burn-through.

[0033] Figure 2 A schematic diagram of the welding process for insert plates inside or at the ends of plates with large openings is shown. Figure 2 Image (a) shows the welding process of the patch plate within a large-aperture plate. Figure 2 Figure (b) shows the welding process of the patch plate at the end of the large-aperture plate. Figure 2 Figure (c) shows the welding process of the patch plate both inside the large-aperture plate and at the end. For example... Figure 2 As shown, in one embodiment, the deformation control method for FCB welding of the large-aperture plate 200 when the patch plate 100 is located within or at the end of the large-aperture plate 200 includes: Step S1a: The patch panel 100 is assembled and pre-joined to the opening of the large-aperture plate 200 based on the I-bevel, forming a pre-jointed panel. Generally, the thickness of the large-aperture plate 200 can be selected from 12mm to 50mm.

[0034] Step S2a: On the front side of the pre-assembled plate, the butt joint 401 between the patch plate 100 and the large-aperture plate 200 is fixed by tack welding. It should be noted that the length of the tack weld is not less than 50mm, and the spacing between adjacent tack welds is 300mm to 400mm.

[0035] Step S3a: Flip the pre-assembled plate so that its reverse side faces upward, and weld the butt joint 401 between the patch plate 100 and the large-aperture plate 200 on the reverse side of the pre-assembled plate. The butt joint 401 between the patch plate 100 and the large-aperture plate 200 can be divided into a straight section and a corner arc section according to different geometric features. The straight section of the butt joint 401 between the patch plate 100 and the large-aperture plate 200 can be welded using submerged arc welding. The corner arc section of the butt joint 401 between the patch plate 100 and the large-aperture plate 200 can be welded using carbon dioxide gas shielded welding. During welding, start welding from the middle of the butt joint 401 and advance symmetrically towards both ends of the weld. See reference [link / reference needed] for details. Figure 2 Welding is performed in the order indicated around the butt joint in (a), (b) and (c).

[0036] Step S4a: Turn the pre-assembled plate over so that its front side is facing up and assemble it with at least one mating plate 300. Hoist the pre-assembled plate to the FCB assembly line for assembly with other mating plates. Specifically, the FCB method is used to weld the mating seam 402 between the pre-assembled plate and the mating plate 300.

[0037] Step S5a: On the front side of the pre-assembled plate, the joint 401 between the patch plate 100 and the large-aperture plate 200 is cleaned by reverse buckling. Specifically, after the FCB welding is completed, the joint of the patch plate 100 is reverse buckled and ground, and the corner arc section on the joint 401 needs to be cleaned by reverse buckling.

[0038] Step S6a: After completing the FCB welding, weld the butt joint 401 between the patch plate 100 and the large-aperture plate 200 on the front side of the pre-assembled plate. The welding sequence can also be referred to Figure 2 Welding is performed in the order indicated around the butt joint in (a), (b) and (c).

[0039] Figure 3 A schematic diagram of the welding process between the large-aperture plate containing the patch plate and the butt plate is shown. Figure 3 Figure (a) shows the welding process between the large-aperture plate and the butt plate when the patch plate is inside the large-aperture plate. Figure 3 Figure (b) shows the welding process between the large-aperture plate and the butt plate when the patch plate is at the end of the large-aperture plate. Figure 3 Figure (c) illustrates the welding process between the large-aperture plate and the butt plate when the patch plate is both inside and at the end of the large-aperture plate. For example... Figure 3As shown, in one embodiment, when the patch plate 100 is located inside or at the end of the large-aperture plate 200, and the large-aperture plate 200 needs to be joined with the adjacent butt plate 300 by submerged arc welding, the deformation control method for the FCB welding of the large-aperture plate includes: Step 1b: Assemble and pre-assemble the patch plate 100 based on the I-bevel at the opening of the large-aperture plate 200. At the same time, assemble the large-aperture plate 200 with the butt plate 300 to form a pre-assembled plate. Generally, the thickness of the large-aperture plate 200 can be selected from 12mm to 50mm.

[0040] Step 2b: On the front side of the pre-assembled plate, tack welds are performed to fix the butt joint 401 between the patch plate 100 and the large-aperture plate 200, and the butt joint 402 between the large-aperture plate 200 and the butt plate 300. It should be noted that the length of the tack weld is not less than 50mm, and the spacing between adjacent tack welds is 300mm to 400mm.

[0041] Step 3b: Flip the pre-assembled plate so that its reverse side faces upward, and weld the butt joint 401 between the patch plate 100 and the large-aperture plate 200 on the reverse side of the pre-assembled plate. The butt joint 401 between the patch plate 100 and the large-aperture plate 200 can be divided into a straight section and a corner arc section according to different geometric features. The straight section of the butt joint 401 between the patch plate 100 and the large-aperture plate 200 can be welded using submerged arc welding. The corner arc section of the butt joint 401 between the patch plate 100 and the large-aperture plate 200 can be welded using carbon dioxide gas shielded welding. During welding, start welding from the middle of the butt joint 401 and advance symmetrically towards both ends of the weld. See reference [link / reference needed] for details. Figure 3 Welding is performed in the order indicated around the butt joint in (a), (b) and (c).

[0042] Step 4b: Flip the pre-assembled plate to its front-facing position and perform reverse-clamping and root cleaning treatment on the front side of the pre-assembled plate and the butt joint 401. Specifically, after completing the FCB welding, the butt joint of the patch plate 100 is reverse-clamped and ground, and the corner arc section on the butt joint 401 needs to be reverse-clamped and root-cleaned. First, use submerged arc welding to complete the front welding of all butt joints except the butt joint 401 between the patch plate and the large opening plate 200.

[0043] Step 5b: The pre-assembled plate is hoisted onto the FCB assembly line for assembly with other mating plates. Specifically, the FCB method is used to weld the mating joint 402 between the pre-assembled plate and the mating plate 300. After welding, the mating joint of the patch plate needs to be reversed and ground. In particular, the corner arc section needs to be reversed and cleaned.

[0044] Step S6b: After completing the FCB welding, weld the butt joint 401 between the patch plate 100 and the large-aperture plate 200 on the front side of the pre-assembled plate. The welding sequence can also be referenced. Figure 4 Welding is performed in the order indicated around the butt joint in (a), (b) and (c). Figure 4 A schematic diagram of the welding process between the patch plate and the front side of the large-aperture plate is shown. Figure 4 Figure (a) shows the welding process between the patch plate and the front side of the large-aperture plate when the patch plate is inside the large-aperture plate. Figure 4 Figure (b) shows the welding process of the patch plate to the front side of the large-aperture plate when the patch plate is at the end of the plate. Figure 4 Figure (c) shows the welding process between the patch plate and the front side of the large opening plate when the patch plate is both inside and at the end of the large opening plate.

[0045] In one embodiment, the deformation control method for FCB welding of large-aperture sheet metal when the patch plate is located on the prefabricated splice seam of the large-aperture sheet metal includes: In step S1c, the patch plate 100 is assembled and pre-spliced ​​onto the opening of the large-aperture plate 200 based on an I-bevel. Simultaneously, the large-aperture plate 200 is assembled with the butt plate 300 to form a pre-assembled plate. Generally, the thickness of the large-aperture plate 200 can be selected from 12mm to 50mm. Optionally, tack welds are performed on the front side of the pre-assembled plate to fix the butt joint 401 between the patch plate 100 and the large-aperture plate 200, and the butt joint 402 between the large-aperture plate 200 and the butt plate 300. It should be noted that the length of the tack weld is not less than 50mm, and the spacing between adjacent tack welds is 300mm to 400mm.

[0046] Step S3c: Flip the pre-assembled plate so that its reverse side faces upward, and weld the butt joint 401 between the patch plate 100 and the large-aperture plate 200 on the reverse side of the pre-assembled plate. The butt joint 401 between the patch plate 100 and the large-aperture plate 200 can be divided into a straight section and a corner arc section according to different geometric features. The straight section of the butt joint 401 between the patch plate 100 and the large-aperture plate 200 can be welded using submerged arc welding. The corner arc section of the butt joint 401 between the patch plate 100 and the large-aperture plate 200 can be welded using carbon dioxide gas shielded welding. During welding, start welding from the middle of the butt joint 401 and advance symmetrically towards both ends of the weld. See reference [link to specific details]. Figure 5 Welding is performed in the order indicated around the butt joint in (a), (b) and (c). Figure 5 This diagram illustrates the welding process on the reverse side when the patch plate is placed on the prefabricated splice seam of a large-aperture plate. Figure 5 Figure (a) shows the welding process on the reverse side when the patch is located inside a large-aperture plate and on the seam of a prefabricated panel. Figure 5 Figure (b) shows the welding process on the reverse side when the patch is located at the end of a large-aperture plate and on the seam of a prefabricated panel. Figure 5 Figure (c) shows the welding process on the reverse side when the patch plate is simultaneously located within the large-aperture plate and at the end, and on the seam of the precast panel.

[0047] Step S4c: Flip the pre-assembled plate to its front-facing position, and perform reverse welding and grinding on the front side of the butt joint 401. The corner arc section on the butt joint of the patch plate 100 needs to be reverse-welded and cleaned. First, use submerged arc welding to complete the front welding of all butt joints except the butt joint 401 between the patch plate and the large-aperture plate 200. For example... Figure 6 As shown, Figure 6 The diagram shows the welding process flow for other butt joints besides the patch plate butt joint when the patch plate is located on the prefabricated splice joint of the large-aperture plate. Figure 6 Figure (a) shows the welding process for other butt joints besides the patch joint when the patch is located inside a large-aperture plate and on a precast panel joint. Figure 6 Figure (b) shows the welding process for other butt joints besides the patch plate butt joint when the patch plate is located at the end of a large-aperture plate and on the precast panel joint. Figure 6 Figure (c) shows the welding process for other butt joints besides the patch joint when the patch plate is located both inside the large-aperture plate and at the end and on the precast panel seam.

[0048] Step S5c: The pre-assembled plate is hoisted onto the FCB assembly line for assembly with other mating plates. Specifically, the FCB method is used to weld the butt joint 402 between the pre-assembled plate and the other mating plates 300. After welding, the butt joint of the patch plate needs to be reversed and ground. In particular, the corner arc section needs to be reversed and cleaned.

[0049] Step S6c: After completing the FCB welding, weld the butt joint 401 between the patch plate 100 and the large-aperture plate 200 on the front side of the pre-assembled plate. The welding sequence can also be referenced. Figure 7 Welding is performed in the order indicated around the butt joint in (a), (b) and (c). Figure 7 The diagram shows a schematic of the welding process on the front side when the patch plate is located on the prefabricated splice seam of the large-aperture plate. Figure 7 (a) shows a schematic diagram of the welding process on the front side when the patch is located inside a large-aperture plate and on the seam of a prefabricated panel. Figure 7Figure (b) shows a schematic diagram of the welding process on the front side when the patch plate is located at the end of a large-aperture plate and on the seam of a prefabricated panel. Figure 7 (c) shows a schematic diagram of the welding process on the front side when the patch plate is located both inside the large-aperture plate and at the end, and on the seam of the prefabricated panel.

[0050] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other orientations or positional relationships are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no special meaning.

[0051] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0052] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0053] The technical principles of this application have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this application without inventive effort, and these embodiments will all fall within the scope of protection of this application.

Claims

1. A method for controlling deformation during FCB welding of large-aperture plates, characterized in that, include: Step S1: Pre-assemble the patch panel (100) onto the opening of the large-aperture plate (200) to form a pre-assembled panel; Step S2: Turn the pre-assembled plate over so that its reverse side faces upward, and weld the butt joint (401) between the patch plate (100) and the large-aperture plate (200) on the reverse side of the pre-assembled plate; Step S3: Turn the pre-assembled plate over so that its front side faces upward and butt it with at least one butt plate (300), and weld the butt joint (402) between the pre-assembled plate and the butt plate (300) using the FCB method; Step S4: After completing the FCB welding, weld the butt joint (401) between the patch plate (100) and the large-aperture plate (200) on the front side of the pre-assembled plate; In Step S2, the butt joint (401) between the patch plate (100) and the large-aperture plate (200) includes a straight section and a corner arc section, and the butt joint (401) between the patch plate (100) and the large-aperture plate (200) on the reverse side of the pre-assembled plate is welded. Submerged arc welding is used to weld the straight section, and carbon dioxide gas shielded welding is used to weld the corner arc section on the back of the pre-assembled plate. In step S4, before welding, the butt joint (401) between the patch plate (100) and the large-hole plate (200) is cleaned by reverse buckling on the front of the pre-assembled plate. In step S2, before welding the butt joint (401) between the patch plate (100) and the large-hole plate (200) on the back of the pre-assembled plate, the following is also included: tack welding is performed on the butt joint (401) between the patch plate (100) and the large-hole plate (200) on the front of the pre-assembled plate. The weld length of the tack weld is not less than 50 mm, and the weld spacing of the tack weld is 300 mm to 400 mm.

2. The deformation control method for FCB welding of large-aperture plates according to claim 1, characterized in that, The thickness of the large-aperture plate (200) is 12mm to 50mm; wherein the bevel between the patch plate (100) and the large-aperture plate (200) is a type I bevel.

3. The deformation control method for FCB welding of large-aperture plates according to claim 1 or 2, characterized in that, The patch plate (100) is located in the internal region of the large-aperture plate (200).

4. The deformation control method for FCB welding of large-aperture plates according to claim 1 or 2, characterized in that, The patch plate (100) is located at the end or edge area of ​​the large-aperture plate (200).

5. The deformation control method for FCB welding of large-aperture plates according to claim 4, characterized in that, In step S2, when welding the butt joint (401) between the patch plate (100) and the large-aperture plate (200) on the reverse side of the pre-assembled plate, welding starts from the middle of the butt joint (401) and proceeds symmetrically to both ends of the butt joint (401).

6. The deformation control method for FCB welding of large-aperture plates according to claim 1 or 2, characterized in that, The large-aperture plate (200) is provided with a prefabricated splicing seam (500), and the opening of the patch plate (100) in the large-aperture plate (200) spans the prefabricated splicing seam (500).

7. The deformation control method for FCB welding of large-aperture plates according to claim 6, characterized in that, The process includes, after step S3 and before step S4, welding the section on the front side of the pre-assembled panel that is not interrupted by the opening of the large-aperture plate (200) at the seam (500).

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