A method for bridge connection and cutting welding of small parts for ships

Abstract

The application discloses a kind of bridge connection and cutting welding method for small parts of ship, according to the gap between steel frame and the position of preliminary welding, small parts of ship are screened and grouped, the same preliminary welding area is connected by bridge structure to form complete assembly convenient to carry, so as to ensure that small parts of ship are free from falling into the gap between steel frame when cutting, not only improve production efficiency and welding quality, but also ensure the portability when transporting;Wherein, by setting bridge structure on the welding edge of small parts of ship, it can be ensured that subsequent installation can be directly disconnected and welded, without additional processing, at the same time, the formed broken end can assist welding positioning.The method of the present application not only solves the low efficiency and risk problem of manual picking in traditional cutting method, but also reduces the labor cost and the loss of material of sleeve material plate, improves the efficiency of welding positioning, especially suitable for the sleeve, cutting and welding operation of a large number of small size patch parts in ship structure.

Description

Technical Field

[0001] This invention belongs to the field of cutting sheet metal parts in shipbuilding, and particularly relates to a method for bridging connections and cutting / welding of small marine parts. Background Technology

[0002] In shipbuilding, the construction of hull structures typically requires the precise cutting of numerous small-sized patch plates for the ship. These small marine parts are then welded to other components in subsequent processes using various methods such as flat welding and fillet welding. In existing technologies, these small marine parts are generally classified and grouped according to their size and shape, with similar-sized and shaped parts grouped together for subsequent plate nesting design. After cutting and shaping, they are ground and then used for welding. The side of the small marine part used for welding is called the welding edge, and the side not used for welding is called the free edge. Positioning during welding often requires the assistance of various tools, and the weld width often depends on the experience of the workers. Currently, the following two traditional cutting methods are commonly used for the nested small marine parts: one method is to first lay a steel mesh on a steel frame, and then cut the nested plates on the steel mesh; the other method, such as... Figure 1 As shown, the sheet metal after nesting is cut directly onto the steel frame. Small marine parts fall directly below the steel frame after cutting and are then picked up manually. The gaps in the steel frame vary depending on the tooling location; the gap width is generally 150mm and the frame height is 320mm. However, both of these traditional cutting methods have the following significant drawbacks:

[0003] For the first method, which involves laying steel mesh on a steel frame and then cutting it, the mesh is quite fine, which makes it easy for welding slag to accumulate in the gaps of the steel mesh during the cutting process and difficult to clean. In addition, the steel mesh itself is also easily damaged by frequent cutting operations. Therefore, in the process of cutting a large number of small marine parts, it is often necessary to replace the steel mesh constantly, which undoubtedly increases the cost of use.

[0004] The second method, which involves cutting directly onto the steel frame and then retrieving the parts, results in small marine parts falling below the frame during the cutting process. This area is often filled with murky water, forcing workers to manually retrieve the parts from this waterlogged environment. Finding the exact location of the small parts quickly in the murky water is difficult, as is precise gripping. Furthermore, this working environment presents higher safety risks, lower worker safety, and lower productivity, leading to relatively high labor costs. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention aims to provide a method for bridging and welding small marine parts. This method optimizes the processes of nesting, cutting, and welding of small marine parts. By flexibly setting a bridging structure at the welding edge of the small marine parts, the parts can be cut directly on a steel frame without the need for a steel mesh. This also solves the problem of small marine parts falling into the gaps in the steel frame during direct cutting, requiring manual retrieval. This reduces the labor intensity of construction workers, improves the safety and production efficiency of cutting large quantities of small marine parts, and allows small marine parts in the same pre-welding area to be grouped into easily portable assemblies, saving production and transportation costs. Furthermore, the design of the broken ends of the bridging structure improves the accuracy and efficiency of welding, resulting in high economic value.

[0006] To achieve the above and other related objectives, the present invention adopts the following technical solution:

[0007] This invention provides a method for bridging and welding small marine parts, comprising the following steps:

[0008] S1. Based on the gap width of the steel frame, select the marine small parts to be prepared for nesting, and group them according to the location of the area to be welded.

[0009] S2. Perform nesting and layout of the small marine parts after screening and grouping. On the nesting layout diagram, by setting a bridge structure on the welding edge of the small marine parts, the small marine parts located in the same pre-welding area and with similar pre-welding positions can form an assembly, and the side length of the assembly parallel to the steel frame gap width direction exceeds the steel frame gap width.

[0010] S3. After completing the nesting layout, cut according to the nesting layout drawing to obtain the assembly with the bridge structure;

[0011] S4. After cutting, the assembly with the bridge structure is transported to the corresponding pre-welding area. When welding and installing at the welding position, the bridge structure on the assembly is disconnected to obtain an independent small marine part, and the broken end of the bridge structure located at the welding edge of the small marine part is retained. Finally, the broken end is used for positioning and welding operations.

[0012] As a preferred technical solution, in step S4, the bridge structure on the assembly is disconnected by flame cutting.

[0013] Furthermore, in step S4, the specific steps of disconnecting the bridge structure on the assembly by flame cutting include: flame cutting from the center of the bridge structure to separate it, so that 4mm of the broken ends are left on both sides of the bridge structure after flame cutting.

[0014] As a preferred technical solution, in step S4, the specific steps for positioning using the broken end include: first, completing the preliminary positioning of the small marine parts at the welding position; then, using the broken end of the bridge structure for positioning calibration to ensure that the broken end of the bridge structure falls on the weld line, so as to complete the positioning calibration of the welding position.

[0015] As a preferred technical solution, in step S4, the specific steps of welding using the broken end include: taking the height of the broken end of the bridge structure as the weld height reference, welding is performed from the broken end to both sides so that the molten pool naturally covers the broken end.

[0016] As a preferred technical solution, in step S2, when laying out the nesting of the selected and grouped small marine parts, the smaller small marine parts are arranged at the top of the nesting layout diagram, and the larger small marine parts are arranged at the bottom of the nesting layout diagram.

[0017] As a preferred technical solution, in step S3, the cutting equipment used when cutting according to the nesting layout diagram is a laser cutting machine or a plasma cutting machine.

[0018] As a further preferred technical solution, in step S1, the length and width of the selected small marine parts are not greater than the gap width of the steel frame.

[0019] As a preferred technical solution, in step S2, the length of the bridge structure is adjusted according to the gap between the small marine parts after the layout, and the width of the bridge structure is 13mm.

[0020] As a preferred technical solution, the distance between the connection points at both ends of the bridge structure shall not exceed 1 / 2 of the maximum side length of the adjacent small marine parts.

[0021] As described above, the present invention has the following beneficial effects:

[0022] (1) The present invention provides a bridge connection and cutting and welding method for small marine parts. By adding a bridge structure between small marine parts to form an assembly, the small marine parts can be cut directly on a steel frame without the need for a steel mesh, which reduces the additional costs caused by welding slag accumulation and frequent replacement of steel mesh, greatly improves production efficiency, and has high economic value.

[0023] (2) The present invention provides a bridge connection and cutting and welding method for small marine parts. By setting up a bridge structure, the small marine parts can maintain a connected state after cutting, which prevents the small marine parts from falling under the steel frame during the cutting process. This eliminates the need for manual retrieval of small marine parts in harsh environments, avoids the time and effort spent on manual retrieval of small marine parts, significantly reduces the labor intensity of construction workers, solves the problem of manual retrieval of small marine parts during cutting, improves work efficiency, and saves personnel costs and material losses. At the same time, by avoiding construction workers from entering under the steel frame to operate, the safety hazards of picking up small marine parts in turbid water are eliminated, improving the safety of construction workers and significantly enhancing the safety of the on-site working environment.

[0024] (3) A method for bridging and welding of small marine parts according to the present invention.

[0025] By placing the bridge structure at the welding edge of small marine components, the cutting and welding operations of the assembly are simplified, and it is easier to transport and carry it to the pre-welding position, thus improving production efficiency. Furthermore, by directly disconnecting the bridge structure before welding, no additional treatment of the broken ends is required, allowing for direct welding operations. The broken ends also assist in the welding positioning of small marine components, ensuring the stability, continuity, and aesthetics of the weld seam. This improves both welding positioning accuracy and welding installation efficiency.

[0026] (4) The present invention provides a method for bridge connection and cutting and welding of small marine parts. By screening and grouping small marine parts located in the same pre-welding area and with similar pre-welding positions, and distributing them as assemblies on the same kitting design drawing, it is easy to optimize the layout. At the same time, the size, shape and setting position of the bridge structure used to form the assembly can be flexibly adjusted and optimized, and can be added or deleted. It has strong intelligent adaptability and can be applied to various working conditions. This ensures that the layout of small marine parts on the plate used for kitting and cutting is reasonable, improves the utilization rate of plate material, saves production costs, and also provides convenience for subsequent cutting and welding operations. It has high practicality.

[0027] In summary, the method of this invention ensures a stable connection between small marine parts, guaranteeing the overall stability of the assembled components after the bridge structure is connected. It effectively prevents small marine parts from falling into the gaps in the steel frame during cutting, reducing the drop rate and avoiding the risks associated with manual retrieval, thus lowering labor costs. Furthermore, this method improves the portability of the assembled components and facilitates the disconnection of the bridge structure during welding and installation, while retaining the cut ends for welding positioning, thereby enhancing the ease of cutting and welding each small marine part. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of on-site cutting when cutting sheet metal into small marine parts on a steel frame in the existing technology.

[0029] Figure 2 This is a schematic diagram of the plate cutting command execution state before the bridge structure is added during plate nesting in this invention.

[0030] Figure 3 This is a schematic diagram of the plate cutting command execution state after adding a bridge structure when nesting plates in the case of small marine parts of the same size in this invention.

[0031] Figure 4 This is a schematic diagram of the plate cutting command execution state after adding a bridge structure when nesting plate materials in the case of different sizes of small marine parts in this invention.

[0032] Figure 5 yes Figure 4 A partially enlarged schematic diagram of the bridge structure at point A.

[0033] Figure 6 yes Figure 5 A magnified view of the bridge structure after it was disconnected before welding.

[0034] Figure 7 yes Figure 4 A magnified view of the bridge structure at point B, after the bridge structure was disconnected before welding.

[0035] Figure 8 This is a schematic diagram of the structure of a single small marine component selected for fillet welding in this invention.

[0036] Figure 9 This is a schematic diagram of the installation position of the small marine parts with a bridge structure in this invention.

[0037] The specific explanations of the reference numerals in the attached drawings are as follows: 1. Bridge structure; 11. Broken end; 2. Small marine parts; 21. Welded edge; 22. Free edge; 23. Arc initiation point; 3. Assembly; 4. Plate; 5. Steel frame; 51. Steel frame gap. Detailed Implementation

[0038] To better understand the purpose, structure, and function of this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments.

[0039] In the description of this invention, it should be noted that the positional relationships indicated by terms such as "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" are based on the positional relationships shown in the accompanying drawings and are only for the purpose of facilitating the description of the embodiments of this invention and simplifying the description. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific direction, and therefore should not be construed as a limitation of this invention.

[0040] Example

[0041] This embodiment provides a method for bridging and welding small marine parts, including the following steps:

[0042] S1. Based on the width of the steel frame gap 51, select the marine small parts 2 to be prepared for nesting, and group the selected marine small parts 2 according to the area where the marine small parts 2 are to be welded.

[0043] S1-1. Select small marine parts 2 whose length and width are both no greater than the width of the steel frame gap 51. In this embodiment, the steel frame 5 is a steel platform, the steel frame gap 51 is 150mm, and the height of the steel frame 5 is 320mm. Among the patch parts on the hull structure design drawings, the selected small marine parts 2 have a length and width both no greater than 150mm. In other preferred embodiments, if the width of the steel frame gap 51 is a, then select small marine parts 2 whose length and width are both ≤ a + 50mm. This allows for a margin, further avoiding the risk that small marine parts 2, whose size is slightly larger than the width of the steel frame gap 51, may accidentally fall into the steel frame gap 51 during cutting operations due to possible vibrations.

[0044] S1-2. First, the selected small marine parts 2 are distinguished according to whether the areas to be welded are the same, and then further distinguished according to whether the positions to be welded are close. Small marine parts 2 located in the same area to be welded and with similar welding positions are grouped into the same group.

[0045] S2, such as Figures 2 to 4 As shown, nesting software is used to nest and arrange the selected and grouped marine small parts 2 on the nesting layout diagram. Specifically, during the layout process, a bridge structure 1 is set between the welding edges 21 of the marine small parts 2. The specific setting position and size of the bridge structure 1 used to connect the marine small parts 2 are determined according to the size and shape of the marine small parts 2. Thus, by setting the bridge structure 1, the marine small parts 2 located in the same pre-welding area and with similar pre-welding positions are formed into an assembly 3, and the side length of the side of the assembly 3 parallel to the width direction of the steel frame gap 51 exceeds the width of the steel frame gap 51.

[0046] S2-1. When laying out the nesting, the patterns of the selected and grouped small marine parts 2 are evenly distributed on the nesting layout diagram, and the welding edges 21 of two adjacent small marine parts 2 patterns that are to be connected by the bridge structure 1 to form the assembly 3 are set relatively parallel; wherein, the welding edge 21 is the side of the small marine part 2 used for welding with the hull structure component.

[0047] In another preferred embodiment, when nesting and laying out the small marine parts 2 after screening and grouping, the larger small marine parts 2 are nested first, followed by the smaller small marine parts 2. The smaller small marine parts 2 are arranged at the top of the nesting layout diagram, and the larger small marine parts 2 are arranged at the bottom of the nesting layout diagram. By first nesting the larger parts to determine the approximate layout framework, and then arranging the smaller parts in the remaining space, the material of the sheet metal 4 can be utilized more fully, reducing material waste, and making it easier to remove the cut small marine parts 2 from the sheet metal 4. At the same time, the arc starting point 23 for the cutting starting point is set at the chamfer of the largest small marine part 2 in the same assembly 3 to ensure the stability of the cutting and improve the overall cutting efficiency.

[0048] S2-2. A bridging structure 1 is set between the drawings of adjacent small marine parts 2 after screening and grouping to connect them and form the drawings of an assembly 3. The assembly 3 includes at least two independent small marine parts 2 until the length of one side of the assembly 3 parallel to the width direction of the steel frame gap 51 exceeds the width of the steel frame gap 51. In actual work, the bridging structure 1 is first set so that at least one side of the assembly 3 in the length or width direction exceeds the width of the gap 51 of the steel frame 5; then, the direction of the side exceeding the width of the steel frame gap 51 is adjusted to be consistent with the distribution direction of the steel frame gap 51.

[0049] During the design phase, individual marine parts 2 of different sizes selected in step S1 are drawn separately, and the free edges 22 and welded edges 21 of the marine parts 2 are confirmed for subsequent nesting layout. For example... Figure 8 As shown, taking one of the small marine parts 2 used for double-sided fillet welding as an example, the small marine part 2 has two welding edges 21 on which bridging structures 1 can be installed; during subsequent nesting, the bridging structure 1 can be installed on any one of the welding edges 21 of the small marine part 2, or it can be installed on both welding edges 21 simultaneously, and no bridging structure 1 is installed on the free edge 22. Preferably, when it is planned to install bridging structures 1 on both welding edges 21 of the small marine part 2 used for double-sided fillet welding simultaneously, such as Figure 4 As shown in the figure, marine small parts 2 numbered ⑦, ⑨, and ⑩ are distributed at the corners of the assembly 3, so that they are connected to the marine small parts 2 located at the front and rear.

[0050] The connection position of the bridging structure 1 can be flexibly adjusted on the welding edge 21 of the small marine part 2 according to the welding method of the small marine part 2, so as to adapt to different cutting and welding requirements. Specifically, when the small marine part 2 is used for fillet welding, the bridging structure 1 is set at the corner near the welding edge 21 and another welding edge 21 on the same small marine part 2; when the small marine part 2 is used for flat welding, the bridging structure 1 is set at the midpoint of the welding edge 21. Furthermore, the shape of the bridging structure 1 can be flexibly adjusted according to the gap 51 between adjacent small marine parts 2 on the nesting layout diagram. In this embodiment, the bridge structure 1 is rectangular, and its two ends are located on the welding edges 21 of adjacent small marine parts 2 that are arranged relatively parallel to each other. The bridge structure 1 is perpendicular to the welding edges 21 of the small marine parts 2, and the arrangement direction between two adjacent bridge structures 1 is perpendicular, thereby ensuring the stability of the bridge connection structure. The assembly 3 connected by the bridge structure 1 has at least one side with a side length greater than 200mm. 200mm is equivalent to the length of an adult's palm, thereby effectively preventing the small marine parts 2 from falling under the steel frame 5 with a gap 51 of 150mm during the cutting process, reducing the drop rate of the small marine parts 2. This avoids the risks associated with manual handling, reduces labor costs, and improves the portability of assembly 3, facilitating the welding and installation of small marine parts 2 within the same welding area. The bridge structure 1 has a width of 13mm, allowing for easy disconnection of the bridge structure 1 and retention of the broken end 11 for welding positioning during subsequent welding and installation. The length of the bridge structure 1 is determined and dynamically adjusted based on the gap 51 between the welding edges 21 of two adjacent small marine parts 2 drawings where the bridge is to be installed. The distance between the connection points at both ends of a single bridge structure 1 does not exceed half the maximum side length of the adjacent small marine parts 2. Preferably, as shown... Figure 5 As shown, in step S2-1, the distance between the welding edges 21 of two adjacent small marine parts 2 is adjusted to 13mm, so that the length of the bridge structure 1 is also 13mm. After subsequent flame cutting and a 5mm loss, 4mm ends 11 are left on each side of the bridge structure 1. Figure 6 As shown. In other embodiments, when the gap 51 between the welded edges 21 of adjacent marine parts 2 grouped in the same assembly 3 on the nesting layout diagram is too large, the shape of the part to be disconnected on the bridge structure 1 can be V-shaped, which can not only improve the connection strength between marine parts 2 in the assembly 3, but also quickly determine the length of the two ends 11 to be retained on the bridge structure 1 through the turning points at both ends of the V-shape.

[0051] S3. After completing the nesting layout, according to the nesting design drawing of plate 4, use CNC cutting technology to cut according to the arc line and cutting path set in the drawing to obtain several assemblies 3 with bridge structure 1.

[0052] S3-1 First, import the nesting layout diagram with the bridge structure 1 connection into the cutting equipment. The cutting equipment includes, but is not limited to, a laser cutting machine or a plasma cutting machine. Through the high-precision operation and real-time monitoring of the cutting equipment, the dimensional accuracy of the marine small parts 2 after cutting and the stable connection of the bridge structure 1 can be ensured. At the same time, it can also reduce material waste caused by cutting errors and improve cutting quality.

[0053] S3-2. Then, starting from the arc initiation point 23, and moving along the outer contour of the assembly 3 as the cutting path, the assembly 3 with the bridge structure 1 is cut into shape, thereby forming a portable assembly 3 from the same pre-welding area and the welding position of the small marine parts 2. This ensures that the small marine parts 2 in the cut assembly 3 remain connected, thus preventing the small marine parts 2 from falling into the gap 51 of the steel frame during the cutting process.

[0054] S4. After cutting, the assembly 3 connected by the bridge structure 1 is transported to the corresponding pre-welding area. When welding is performed at the welding position, the bridge structure 1 on the assembly 3 is disconnected to obtain the required individual marine parts 2. The cross-section of the broken end 11 of the bridge structure 1 can be directly used for welding without additional treatment. The broken end 11 is used to assist in correcting the welding position. Then, the welding edge 21 where the broken end 11 is located is welded to other components on the hull structure. To further improve dimensional accuracy and surface quality, the cut assembly 3 can be inspected using a high-precision measuring tool after cutting in step S3.

[0055] S4-1. The cut assembly 3 is transported to the corresponding welding work area and carried by construction personnel to the pre-welding position. Before welding, a cutting tool is used to sequentially complete the separation operation of the bridge structure 1 through flame cutting, so that the assembly 3 is quickly separated into independent small marine parts 2 for subsequent assembly and use. In this embodiment, the gas cutting process in flame cutting is used, and the cutting tool is an oxy-acetylene cutting torch. The bridge structure 1 is cut from the center, so that the bridge structure 1 retains 4mm cut ends 11 on both sides for welding positioning. The cut ends 11 of the bridge structure 1 can be directly welded without grinding. Figure 6 and Figure 7 As shown, the broken end 11 of the bridge structure 1 after separation can also serve as a reference for the weld height during welding, improving installation efficiency and reducing the accumulation of errors when manually positioning the weld. In other embodiments, the broken end 11 of the bridge structure 1 can be further beveled during the flame cutting process to meet the requirements of flat welding or fillet welding, thereby improving welding accuracy.

[0056] S4-2. First, complete the preliminary positioning of the small marine part 2 at the welding position; then, use the broken end 11 of the bridge structure 1 for positioning calibration; finally, using the height of the remaining broken end 11 of the bridge structure 1 after the separation operation as the height reference for weld formation, perform welding operations from the broken end 11 of the bridge structure 1 to both sides. During the welding process, the broken end 11 of the bridge structure 1 is covered by the weld pool, so no additional grinding is required when performing the separation operation of the bridge structure 1 in step S4-1, which not only improves the welding positioning efficiency of the small marine part 2, but also saves welding preparation time.

[0057] In this embodiment, as Figure 9 As shown, taking the small marine part 2 used for double-sided fillet welding as an example, the small marine part 2 is set on the ball head side of the ball flat steel, and the longitudinal welding edge 21 is welded to the ball flat steel and the transverse welding edge 21 is welded to the transverse bone to form a patch plate for the longitudinal bone. Specifically, first, place the small marine part 2 on the side of the ball flat steel located on the ball head side, and make the surface of the small marine part 2 fit against the longitudinal frame surface; then, fine-tune the position of the small marine part. When the small marine part 2 is provided with a bridging structure 1 on two welding edges 21 in step S2, ensure that the broken end 11 on the longitudinal welding edge 21 and the broken end 11 on the transverse welding edge 21 of the small marine part 2 both fall on the pre-weld line of the double-sided fillet weld. When the small marine part 2 is provided with a bridging structure 1 on only one welding edge 21 in step S2, first ensure that the broken end 11 of the small marine part 2 falls on the pre-weld line of the double-sided fillet weld, and then ensure that the endpoint near the broken end 11 on the other welding edge 21 of the small marine part 2 also falls on the pre-weld line of the double-sided fillet weld, thus completing the positioning of the welding position.

[0058] In other embodiments, taking a small marine part 2 for flat welding as an example, according to the welding position of the small marine part 2 and the position of the broken end 11 on the small marine part 2, a positioning point is drawn on the welding edge of the hull structure at the position corresponding to the broken end 11. Here, it is assumed that the broken end 11 of the small marine part 2 in step S2 is set at the midpoint of the welding edge on the small marine part 2. Therefore, the positioning point is drawn at the midpoint of the prepared weld line on the welding edge of the hull structure. By aligning the broken end 11 on the small marine part 2 with the positioning point, the angle between the small marine part and the hull structure is adjusted with the broken end 11 as the fulcrum. At the same time, the distance between the two sides of the broken end 11 and the welding edge of the hull structure is consistent, and the positioning of the welding position can be completed.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Those skilled in the art can make various changes or equivalent substitutions to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of this invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are protected by this invention.

Claims

1. A method for bridging and welding small marine parts, characterized in that, Includes the following steps: S1. Based on the width of the steel frame gap (51), select the marine small parts (2) to be prepared for the assembly, and group them according to the location of the area to be welded. S2. The small marine parts (2) after screening and grouping are nested and laid out. On the nesting layout diagram, a bridge structure (1) is set on the welding edge (21) of the small marine parts (2) so that the small marine parts (2) located in the same pre-welding area and with similar pre-welding positions form an assembly (3), and the side length of the assembly (3) parallel to the width direction of the steel frame gap (51) exceeds the width of the steel frame gap (51). S3. After completing the nesting layout, cut according to the nesting layout diagram to obtain the assembly (3) with the bridge structure (1); S4. After cutting, the assembly (3) with the bridge structure (1) is transported to the corresponding pre-welding area. When welding and installing at the welding position, the bridge structure (1) on the assembly (3) is disconnected to obtain an independent marine part (2). The broken end (11) of the bridge structure (1) located at the welding edge (21) of the marine part (2) is retained. Finally, the broken end (11) is used for positioning and welding operations.

2. The method for bridging and welding of small marine parts according to claim 1, characterized in that, In step S4, the bridge structure (1) on the assembly (3) is disconnected by flame cutting.

3. The method for bridging and welding small marine parts according to claim 2, characterized in that, In step S4, the specific steps of disconnecting the bridge structure (1) on the assembly (3) by flame cutting include: flame cutting from the center of the bridge structure (1) to leave a 4mm cut end (11) on each side of the bridge structure (1) after flame cutting.

4. The method for bridging and welding of small marine parts according to claim 1, characterized in that, In step S4, the specific steps for positioning using the broken end (11) include: first, completing the preliminary positioning of the small marine part (2) at the welding position; then, using the broken end (11) of the bridge structure (1) for positioning calibration to ensure that the broken end (11) of the bridge structure (1) falls on the pre-weld line, thus completing the positioning calibration of the welding position.

5. The method for bridging and welding small marine parts according to claim 1, characterized in that, In step S4, the specific steps of welding using the broken end (11) include: taking the height of the broken end (11) of the bridge structure (1) as the weld height reference, welding is performed from the broken end (11) to both sides so that the molten pool naturally covers the broken end (11).

6. The method for bridging and welding of small marine parts according to claim 1, characterized in that, In step S2, when nesting and laying out the small marine parts (2) after screening and grouping, the smaller small marine parts (2) are arranged at the top of the nesting layout diagram, and the larger small marine parts (2) are arranged at the bottom of the nesting layout diagram.

7. The method for bridging and welding of small marine parts according to claim 1, characterized in that, In step S3, the cutting equipment used when cutting according to the nesting layout diagram is a laser cutting machine or a plasma cutting machine.

8. A method for bridging and welding small marine parts according to any one of claims 1-7, characterized in that, In step S1, the length and width of the selected small marine parts (2) are not greater than the width of the steel frame gap (51).

9. A method for bridging and welding small marine parts according to claim 8, characterized in that, In step S2, the length of the bridge structure (1) is adjusted according to the gap (51) between the small marine parts (2) after the layout, and the width of the bridge structure (1) is 13mm.

10. A method for bridging and welding small marine parts according to claim 9, characterized in that, The distance between the connection points at both ends of the bridge structure (1) shall not exceed 1 / 2 of the maximum side length of the adjacent small marine parts (2).

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