Method for controlling deformation of a container ship hatch coaming plate structure

Abstract

The application provides a container ship hatch coaming thick plate structure deformation control method, and the specific steps include: grouping each component in the segmentation stage; positioning welding is performed on each component in each group respectively; after the positioning welding is completed, at least part of the components in each group are fixed by using a tool; and in the total assembly stage, construction is performed in the sequence of welding the internal components first and then welding the external components. The above method can effectively control the welding deformation and can greatly reduce the fire correction.

Description

Technical Field

[0001] This invention relates to the field of hatch coaming welding, and in particular to a method for controlling the deformation of thick plate structures in container ship hatch coamings. Background Technology

[0002] During the construction of the hatch coaming, welding is a significant undertaking, often resulting in substantial welding deformation during segmented and final assembly. In the segmented stage, the main issue involves deep-penetration fillet welds between the longitudinal skeletons and the hatch coaming top plate, main deck, outer plating, and longitudinal bulkheads. These welds require numerous fillet layers, are difficult to control, exhibit stress concentration, and cause considerable deformation. After welding, hot work is required for correction, wasting considerable manpower and energy. During the assembly and final assembly stages, the main challenges lie in the butt welding between longitudinal skeletons, outer platings, decks, top plates, and longitudinal bulkheads. Improper welding sequences often lead to significant welding deformation. Summary of the Invention

[0003] In view of the shortcomings of the above-mentioned related technologies, the purpose of this invention is to provide a method for controlling the deformation of the thick plate structure of the container ship hatch coaming, so as to solve the problem of large welding deformation in the related technologies.

[0004] To achieve the above and other related objectives, the present invention provides a method for controlling the deformation of a thick plate structure at the hatch of a container ship. The specific steps include: grouping the components in the segmentation stage; performing tack welding on each component in each group; after the tack welding is completed, using tooling to fix at least some of the components in each group; and in the final assembly stage, constructing the components in the order of welding the internal components first and then the external components.

[0005] Optionally, the component is preheated before the tack welding, and the preheating temperature is 100-120℃.

[0006] Optionally, carbon dioxide gas shielded welding is used for the tack welding. The tack welding is performed on one side of the component, and the welding is performed once every 300-500mm, with a welding length of not less than 200mm. Multiple layers are welded each time.

[0007] Optionally, when performing multi-layer welding, the multi-layer welds form a stepped shape.

[0008] Optionally, the positioning welding is performed using automatic fillet welding with a current of 260-290A, a voltage of 27-29V, and a welding speed not exceeding 45cm / min.

[0009] Optionally, the internal components include main deck longitudinal ribs, outer plate thick plate longitudinal ribs, inner longitudinal wall thick plate longitudinal ribs, outer plate thin plate longitudinal ribs, and inner longitudinal wall thin plate longitudinal ribs; the external components include outer plate thin plates, inner longitudinal wall thin plates, outer plate thick plates, inner longitudinal wall thick plates, main deck, hatch coaming top plate, hatch coaming plate, and hatch coaming reinforcement plate.

[0010] Optionally, the construction steps in the overall assembly stage, which follow the sequence of welding internal components first and then external components, are as follows: First, weld the butt joints between the two main deck longitudinals, the two outer plate thick longitudinals, the two inner longitudinal wall thick longitudinals, the two outer plate thin longitudinals, and the two inner longitudinal wall thin longitudinals in the two sections. Then, weld the fillet welds between the main deck and the main deck longitudinals, the fillet welds between the outer plate thicks and the outer plate thick longitudinals, and the fillet welds between the inner longitudinal wall thicks and the inner longitudinals. The fillet welds between the longitudinal stiffeners of the thick longitudinal plates, the fillet welds between the thin outer plates and the longitudinal stiffeners of the thin outer plates, and the fillet welds between the thin inner longitudinal plates and the longitudinal stiffeners of the thin inner longitudinal plates are welded. Finally, the butt joints between the two thick outer plates, the two thick inner longitudinal plates, the two thin outer plates, the two thin inner longitudinal plates, the two hatch coamings, the two hatch coaming top plates, the two hatch coaming reinforcing plates, and the two main decks are welded.

[0011] Optionally, the welding of the butt joint between the two outer thin plates and the welding of the butt joint between the two inner longitudinal wall thin plates in the two segments are carried out symmetrically at the same time; the welding of the butt joint between the two outer thick plates and the welding of the butt joint between the two inner longitudinal wall thick plates are carried out symmetrically at the same time.

[0012] Optionally, when using butt welding during the welding process of the main assembly, the current for the root pass is 200-220A, the voltage is 24-26V, and the welding speed is 15-20cm / min; the current for the fill and cover passes is 240-280A, the voltage is 26-28V, and the welding speed is 25-40cm / min.

[0013] Optionally, when using vertical butt welding during the welding process of the main assembly, the current for the root pass is 160-180A, the voltage is 22-23V, and the welding speed is 10-13cm / min; the current for the fill and cover passes is 180-200A, the voltage is 24-26V, and the welding speed is 14-20cm / min.

[0014] As described above, the deformation control method for the thick plate structure of the container ship hatch coaming of the present invention has the following beneficial effects: The present invention effectively controls welding deformation by employing pre-welding assembly positioning and rigid fixation of components, thereby significantly reducing welding work and enabling continuous welding by an automated trolley, improving production efficiency and ensuring welding quality. A special welding sequence is used in the final section stage to control welding deformation, effectively reducing the need for welding correction. Attached Figure Description

[0015] Figure 1The diagram shown is a schematic representation of the hatch cofferdam structure in an embodiment of the present invention.

[0016] Figure 2 The diagram shows the tooling for fixing the hatch coaming top plate, hatch coaming plate, and hatch coaming reinforcing plate in an embodiment of the present invention.

[0017] Figure 3 The diagram shown illustrates the fixing of the main deck and main deck longitudinal ribs in an embodiment of the present invention.

[0018] Component designation explanation

[0019] 1. Main deck longitudinal ribs; 2. Outer plating thick plate longitudinal ribs; 3. Inner longitudinal wall thick plate longitudinal ribs; 4. Outer plating thin plate longitudinal ribs; 5. Inner longitudinal wall thin plate longitudinal ribs; 6. Outer plating thin plate; 7. Inner longitudinal wall thin plate; 8. Outer plating thick plate; 9. Inner longitudinal wall thick plate; 10. Main deck; 11. Hatch coaming top plate; 12. Hatch coaming plate; 13. Hatch coaming reinforcement plate; 14. First tooling; 15. Second tooling; 16. Third tooling; 17. Fourth tooling; 18. Fifth tooling. Detailed Implementation

[0020] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0021] In the detailed description of embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0022] For ease of description, spatial relation terms such as “below,” “under,” “lower than,” “below,” “above,” and “upper” may be used herein to describe the relationship between one element or feature shown in the accompanying drawings and other elements or features. It will be understood that these spatial relation terms are intended to include directions other than those depicted in the drawings for the device in use or operation. Furthermore, when a layer is referred to as being “between” two layers, it can be the only layer between the two layers, or there may be one or more layers in between. The phrase “between” as used herein includes both endpoint values.

[0023] In the context of this application, the structure described above the first feature may include embodiments in which the first and second features are formed in direct contact, or embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0024] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0025] like Figure 1 and Figure 2 As shown, this embodiment provides a method for controlling the deformation of a container ship hatch coaming thick plate structure. The object being welded is the hatch coaming structure, which includes a main deck longitudinal rib 1, an outer thick plate longitudinal rib 2, an inner longitudinal wall thick plate longitudinal rib 3, an outer thin plate longitudinal rib 4, an inner longitudinal wall thin plate longitudinal rib 5, an outer thin plate 6, an inner longitudinal wall thin plate 7, an outer thick plate 8, an inner longitudinal wall thick plate 9, a main deck 10, a hatch coaming top plate 11, a hatch coaming plate 12, and a hatch coaming reinforcing plate 13, wherein the thickness of each component is at least 50 mm. Specific steps include:

[0026] In the segmentation stage, each component is grouped and positioned by welding to fix its position.

[0027] Specifically, for example, the first fixture 14 is first spot-welded to the jig, and then the hatch coaming top plate 11 is horizontally clamped to the first fixture 14. The hatch coaming plate 12 and the hatch coaming reinforcing plate 13 are first assembled to the hatch coaming top plate 11, wherein the assembly gap between the hatch coaming plate 12 and the hatch coaming top plate 11 is 0-3mm, and the assembly gap between the hatch coaming reinforcing plate 13 and the hatch coaming top plate 11 is 0-3mm. Before tack welding, the hatch coaming top plate 11, the hatch coaming plate 12, and the hatch coaming reinforcing plate 13 are preheated. The preheating temperature for tack welding is 100-120℃, using flame heating or electric heating plate heating. In this embodiment, only carbon dioxide gas shielded welding is allowed for tack welding, performed on one side of the steel plate, using matching flux-cored welding wire. When performing tack welding, weld along the joint between the two components, welding once every 300-500mm, with a weld length of not less than 200mm, and at least two layers of welding each time. When performing tack welding at both ends of the joint, the weld length is increased by 100mm, and an additional layer of welding is required. When performing multi-layer welding, the weld should form a stepped shape, that is, when welding the second layer on the first layer, the ends of the second layer weld should be shorter than the first layer weld.

[0028] When starting the tack welding, use automatic fillet welding with a current of 260-290A, a voltage of 27-29V, and a welding speed not exceeding 45cm / min. It should be noted that the weld seam uses multi-layer, multi-pass welding, and the interpass temperature does not exceed 200℃.

[0029] When tack welding the main deck 10 and the main deck longitudinal rib 1, the main deck 10 is first placed on the jig, and then the main deck longitudinal rib 1 is assembled onto the main deck 10 for tack welding. The assembly parameters and welding parameters between the main deck 10 and the main deck longitudinal rib 1 are the same as those for the tack welding of the hatch coaming top plate 11.

[0030] Similarly, the tack welding between the outer thick plate longitudinal rib 2 and the outer thick plate 8, the tack welding between the inner longitudinal wall thick plate longitudinal rib 3 and the inner longitudinal wall thick plate 9, the tack welding between the outer thin plate longitudinal rib 4 and the outer thin plate 6, and the tack welding between the inner longitudinal wall thin plate longitudinal rib 5 and the inner longitudinal wall thin plate 7 are all performed in the above manner.

[0031] After the tack welding is completed, tooling is used to fix some components.

[0032] like Figure 2 and Figure 3 As shown, specifically, for example, to reinforce and fix the hatch coaming 12 and the hatch coaming reinforcement plate 13, a second tooling 15 is welded to the side of the hatch coaming 12, a third tooling 16 is snapped onto the top plate of the hatch coaming reinforcement plate 13, and a fourth tooling 17 is used, with one end of the fourth tooling 17 welded to the hatch coaming 12 and the other end welded to the third tooling. The second tooling 15 and the third tooling 16 are connected and fixed to the external structure via a support rod. The materials of the second tooling 15, the third tooling 16, and the fourth tooling 17 are the same as those of the hatch coaming 12.

[0033] For example, to reinforce and fix the main deck longitudinals 1, a fifth tooling 18 is used to snap onto the tops of the two main deck longitudinals 1, and the fifth tooling 18 is fixed to the external structure via a support rod. By using tooling to reinforce some components, the stability of the components during the welding process can be ensured, deformation can be reduced, and welding quality can be guaranteed. On the other hand, using the above-mentioned tooling can avoid obstructing the automatic welding carriage and avoid affecting the continuous welding of the automatic welding carriage.

[0034] Welding assembly is performed in the order from internal components to external components.

[0035] Specifically, the internal components mainly refer to the main deck longitudinal rib 1, the outer thick plate longitudinal rib 2, the inner longitudinal wall thick plate longitudinal rib 3, the outer thin plate longitudinal rib 4, and the inner longitudinal wall thin plate longitudinal rib 5; the external components mainly refer to the outer thin plate 6, the inner longitudinal wall thin plate 7, the outer thick plate 8, the inner longitudinal wall thick plate 9, the main deck 10, the hatch coaming top plate 11, the hatch coaming plate 12, and the hatch coaming reinforcement plate 13.

[0036] During final assembly, multiple sections need to be assembled into a whole. For example, when welding two sections together, first weld the butt joints between the two main deck longitudinals 1, the two outer plate thick longitudinals 2, the two inner wall thick longitudinals 3, the two outer plate thin longitudinals 4, and the two inner wall thin longitudinals 5. Then weld the fillet welds between the main deck 10 and the main deck longitudinals 1, the fillet welds between the outer plate thicks 8 and the outer plate thick longitudinals 2, and the inner wall thicks 9 and the inner wall thick longitudinals 5. The fillet welds between plates 3, between outer thin plates 6 and outer thin plate longitudinal ribs 4, and between inner longitudinal wall thin plates 7 and inner longitudinal wall thin plate longitudinal ribs 5 are welded. Finally, the butt joints between the two outer thick plates 8, the two inner longitudinal wall thick plates 9, the two outer thin plates 6, the two inner longitudinal wall thin plates 7, the two hatch coamings 12, the two hatch coaming top plates 11, the two hatch coaming reinforcing plates 13, and the two main decks 10 are welded. Among these, the welding of the butt joints between the two outer thin plates 6 and the two inner longitudinal wall thin plates 7 in the two sections can be carried out simultaneously and symmetrically. The welding of the butt joints between the two outer thick plates 8 and the two inner longitudinal wall thick plates 9 can also be carried out simultaneously and symmetrically.

[0037] Two welding methods are used in the overall welding process: flat butt welding and vertical butt welding. When using flat butt welding, the current for the root pass is 200-220A, the voltage is 24-26V, and the welding speed is 15-20cm / min; the current for the fill and cover passes is 240-280A, the voltage is 26-28V, and the welding speed is 25-40cm / min.

[0038] When using vertical butt welding, the current for the root pass is 160-180A, the voltage is 22-23V, and the welding speed is 10-13cm / min; the current for the fill and cover passes is 180-200A, the voltage is 24-26V, and the welding speed is 14-20cm / min.

[0039] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for controlling the deformation of a thick cofferdam structure at the hatch opening of a container ship, characterized in that, The specific steps include: The components are grouped during the segmentation stage; Each component in each group is tack welded separately; After the tack welding is completed, tooling is used to fix at least some of the components in each group; During the final assembly phase, construction is carried out in the order of welding internal components first, followed by welding external components. The internal components include main deck longitudinal ribs, outer plate thick plate longitudinal ribs, inner longitudinal wall thick plate longitudinal ribs, outer plate thin plate longitudinal ribs, and inner longitudinal wall thin plate longitudinal ribs; the external components include outer plate thin plate, inner longitudinal wall thin plate, outer plate thick plate, inner longitudinal wall thick plate, main deck, hatch coaming top plate, hatch coaming plate, and hatch coaming reinforcement plate. The construction steps in the overall assembly stage, following the sequence of welding internal components first and then external components, are as follows: First, weld the butt joints between the two main deck longitudinals, the two outer plate thick longitudinals, the two inner longitudinal wall thick longitudinals, the two outer plate thin longitudinals, and the two inner longitudinal wall thin longitudinals. Then, weld the fillet welds between the main deck and the main deck longitudinals, the fillet welds between the outer plate thicks and the outer plate thick longitudinals, the fillet welds between the inner longitudinal wall thicks and the inner longitudinal wall thick longitudinals, the fillet welds between the outer plate thins and the outer plate thin longitudinals, and the fillet welds between the inner longitudinal wall thins and the inner longitudinal wall thin longitudinals. Finally, weld the butt joints between the two outer plate thicks, the two inner longitudinal wall thicks, the two outer plate thins, the two inner longitudinal wall thins, the two hatch coamings, the two hatch coaming tops, the two hatch coaming reinforcing plates, and the two main decks.

2. The method for controlling deformation of the thick plate structure at the hatch opening of a container ship according to claim 1, characterized in that: Before the tack welding, the component is preheated at a temperature of 100-120℃.

3. The method for controlling deformation of the thick plate structure at the hatch opening of a container ship according to claim 1, characterized in that: The tack welding is performed using carbon dioxide gas shielded welding. Tack welding is performed on one side of the component, with welding done every 300-500mm, and the length of each weld is not less than 200mm. Multiple layers are welded each time.

4. The method for controlling deformation of the thick plate structure at the hatch opening of a container ship according to claim 3, characterized in that: When performing multi-layer welding, the multi-layer welds form a stepped shape.

5. The method for controlling deformation of the thick plate structure at the hatch opening of a container ship according to claim 1, characterized in that: The positioning welding is performed using automatic fillet welding with a current of 260-290A, a voltage of 27-29V, and a welding speed not exceeding 45cm / min.

6. The method for controlling deformation of the thick plate structure at the hatch opening of a container ship according to claim 1, characterized in that: The welding of the butt joints between the two outer thin plates and the welding of the butt joints between the two inner longitudinal wall thin plates in the two segments are carried out symmetrically at the same time; the welding of the butt joints between the two outer thick plates and the welding of the butt joints between the two inner longitudinal wall thick plates are carried out symmetrically at the same time.

7. The method for controlling deformation of the thick plate structure at the hatch opening of a container ship according to claim 1, characterized in that: When using butt welding during the overall welding process, the current for the root pass is 200-220A, the voltage is 24-26V, and the welding speed is 15-20cm / min; the current for the fill and cover passes is 240-280A, the voltage is 26-28V, and the welding speed is 25-40 cm / min.

8. The method for controlling deformation of the thick plate structure at the hatch opening of a container ship according to claim 1, characterized in that: When using vertical butt welding during the overall welding process, the current for the root pass is 160-180A, the voltage is 22-23V, and the welding speed is 10-13cm / min; the current for the fill and cover passes is 180-200A, the voltage is 24-26V, and the welding speed is 14-20cm / min.

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