Stern shaft cast steel and welding method of stern shaft cast steel and ship plate

Abstract

This invention relates to the field of shipbuilding technology, and more particularly to a stern shaft cast steel component and a welding method for the stern shaft cast steel component to the ship plate. The stern shaft cast steel component includes an outer connecting part and an inner connecting part. The outer connecting part is connected to the front end of the cast steel component body. Outer connecting parts are provided on both the left and right sides of the cast steel component body. Each outer connecting part has a mating boss extending along its inner sidewall plane at its front end. The inner side of the mating boss is flush with the inner side of the outer connecting part, and the outer side of the mating boss is lower than the outer side of the outer connecting part. The outer plate of the ship plate can overlap the outer side of the mating boss and be welded and fixed thereto. The inner connecting part is connected to the front end of the cast steel component body and sandwiched between the two outer connecting parts. The inner connecting part extends forward and protrudes beyond the radial plane of the ship formed by the front ends of the two mating bosses. The inner connecting part can be welded and fixed to the inner plate of the ship plate. The welding method for the stern shaft cast steel component to the ship plate achieves a reasonable welding of the stern shaft cast steel component to the ship plate by applying the above-mentioned stern shaft cast steel component.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and in particular to stern shaft cast steel parts and a method for welding stern shaft cast steel parts to ship plates. Background Technology

[0002] With the continuous development of marine resources, ships are becoming increasingly heavy, resulting in greater hull weight. The stern shaft extends along the fore-and-aft direction of the ship, with its front end connected to the hull plating and its rear end connected to the propeller. To accommodate the rapidly changing structural lines, limited internal space, and high stress requirements of the stern shaft area, the stern shaft structure is generally designed and constructed using a method of welding stern shaft cast steel components to the hull plating.

[0003] Stern shaft cast steel components typically consist of a main cast steel body, an outer portion welded to the outer plate of the hull, and an inner portion welded to the inner plate of the hull, with the outer and inner portions extending forward by the same distance. In existing technologies, the welding of the stern shaft cast steel components to the hull plate is challenging due to the close relative distance between the outer and inner portions, which interfere with each other and create obstacles. This results in high welding difficulty, low welding quality, and low welding efficiency. Specifically, the welding method for the outer portion to the outer plate is a slotted bottom welding, meaning that after welding the outer side of the outer portion to the outer plate, a slot needs to be cut into the inner side of the outer portion and then sealed with bottom welding. The narrow space between the outer and inner portions obstructs the worker's view and makes it difficult to adjust the equipment to a suitable position. Similarly, welding the inner portion to the inner plate requires welding on both sides of the inner portion, again obstructing the worker's view and making it difficult to adjust the equipment to a suitable position.

[0004] Therefore, there is an urgent need to invent a stern shaft cast steel component and a welding method for the stern shaft cast steel component to the ship plate in order to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a stern shaft cast steel component and a welding method for the stern shaft cast steel component and the ship plate, so as to achieve reasonable welding of the stern shaft cast steel component and the ship plate, reduce the welding difficulty of the stern shaft cast steel component and the ship plate, and improve construction efficiency and welding quality.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Stern shaft cast steel parts, including:

[0008] Cast steel body;

[0009] An external connection portion is connected to the front end of the main body of the cast steel component. The main body of the cast steel component has external connections on both its left and right sides. Each external connection portion has a mating boss extending along its own extension direction at its front end. The inner surface of the mating boss is flush with the inner surface of the external connection portion, and the outer surface of the mating boss is lower than the outer surface of the external connection portion. The outer plate of the ship plate can overlap the outer surface of the mating boss and be welded and fixed to the mating boss.

[0010] The inner connection is connected to the front end of the main body of the cast steel part and sandwiched between the two outer connections. The inner connection extends forward and protrudes from the front end faces of the two mating bosses to form the radial plane of the ship. The inner connection can be welded and fixed to the inner plate of the ship plate.

[0011] As a preferred embodiment, the thickness H1 of the mating boss is 10mm to 15mm, the extension distance L1 of the mating boss along the extension direction of the outer part is 30mm to 50mm, and the distance L2 between the front end face of the outer part and the rear end face of the ship plate that overlaps the outer side of the mating boss is 8mm to 10mm.

[0012] As a preferred embodiment, the distance L3 between the inner part extending forward and the front ends of the two docking bosses forming the radial plane of the ship is 50-100 mm.

[0013] The welding method for the stern shaft cast steel component to the ship plate, using the stern shaft cast steel component as described above, includes the following steps:

[0014] Using the two gaps on opposite sides when the inner part and the inner plate of the ship plate are joined as welds, the inner plate of the ship plate and the inner part are sequentially welded and fixed together along the two welds.

[0015] The outer plate of the ship's plate is overlapped on the outer end face of the docking boss;

[0016] Using the gap between the front end of the outer part and the rear end of the outer plate of the ship plate as a weld seam, the outer plate of the ship plate and the outer part are welded and fixed together along the weld seam.

[0017] Using the gap between the outer side of the front end of the docking boss and the inner side of the outer plate of the ship plate as the weld seam, the outer plate of the ship plate, which has been welded and fixed to the front end of the outer part, is welded and fixed to the front end of the docking boss.

[0018] As a preferred embodiment, before welding the inner part and the inner plate of the ship plate, as well as the outer part and the outer plate of the ship plate, the inner part, the outer part, and the mating boss need to be preheated respectively.

[0019] As a preferred embodiment, the preheating temperature of the inner part and the outer part is 100℃~150℃.

[0020] As a preferred embodiment, after the welding of the inner part and the inner plate of the ship plate, and the welding of the outer part and the outer plate of the ship plate are completed, the inner part and the inner plate of the ship plate, the outer part and the outer plate of the ship plate, and the mating boss and the outer plate of the ship plate need to be heat-insulated.

[0021] As a preferred embodiment, after completing the welding of any one of the two welds between the inner part and the inner plate of the ship plate, the unwelded weld is grooved and ground until the completed weld and the unfinished weld are connected.

[0022] As a preferred embodiment, after the welding of the inner part to the inner plate and the outer part to the outer plate is completed, the welding quality of the welding between the inner part to the inner plate, the outer part to the outer plate, and the mating boss to the outer plate is inspected.

[0023] As a preferred embodiment, the welding quality is inspected by a combination of ultrasonic testing and magnetic particle testing between the inner connecting part and the inner plate of the ship plate, and between the outer connecting part and the outer plate of the ship plate. The welding quality is inspected by magnetic particle testing between the mating boss and the outer plate of the ship plate.

[0024] The beneficial effects of this invention are:

[0025] The stern shaft cast steel part provided by the present invention has a mating boss extending along its own extension direction on the outer part, so that the inner side of the mating boss is flush with the inner side of the outer part and the outer side of the mating boss is lower than the outer side of the outer part. The outer plate of the ship plate is overlapped on the outer side of the mating boss, which facilitates the welding and fixing of the outer part and the outer plate of the ship plate. By extending the inner part forward and extending beyond the front end face of the two mating bosses to form the radial plane of the ship, it is also convenient to weld and fix the inner part to the inner plate of the ship plate. This solves the problems of narrow construction space and obstructed vision of construction personnel in the prior art, effectively reduces the construction difficulty, and improves welding efficiency and welding quality.

[0026] The present invention also provides a welding method for stern shaft cast steel parts and ship plates. By applying the above-mentioned stern shaft cast steel parts to ship plates for welding and reasonably setting the welding sequence, the problems of narrow construction space and obstructed vision of construction personnel in the prior art are solved, effectively reducing construction difficulty and improving welding efficiency and welding quality. Attached Figure Description

[0027] Figure 1 This is one of the partial cross-sectional schematic diagrams of a ship provided in the background art of this invention;

[0028] Figure 2 This is a cross-sectional view of the stern shaft cast steel part and the ship plate provided in the background art of this invention;

[0029] Figure 3 This is a cross-sectional view of the stern shaft cast steel part and the ship plate provided in an embodiment of the present invention. Figure 1 ;

[0030] Figure 4 This is a cross-sectional view of the stern shaft cast steel part and the ship plate provided in an embodiment of the present invention. Figure 2 ;

[0031] Figure 5 This is one of the welding steps diagrams of the stern shaft cast steel part and the ship plate provided in the embodiment of the present invention;

[0032] Figure 6 This is the second of the welding steps diagrams for the stern shaft cast steel part and the ship plate provided in the embodiment of the present invention;

[0033] Figure 7 This is the third of the welding steps diagrams for the stern shaft cast steel part and the ship plate provided in the embodiment of the present invention;

[0034] Figure 8 This is the fourth step diagram of the welding process between the stern shaft cast steel part and the ship plate provided in the embodiment of the present invention;

[0035] Figure 9 This is the fifth of the welding steps diagrams for the stern shaft cast steel part and the ship plate provided in the embodiment of the present invention;

[0036] Figure 10 This is a flowchart illustrating the main process of welding a stern shaft cast steel component to a ship plate, as provided in an embodiment of the present invention.

[0037] Figure 11 This is a detailed flowchart of the welding method between the stern shaft cast steel part and the ship plate provided in the embodiment of the present invention.

[0038] In the picture:

[0039] 1. First welding position; 2. Second welding position; 3. Third welding position;

[0040] 100. Stern shaft cast steel part; 110. External connection part; 111. Mud docking boss; 120. Internal connection part; 130. Cast steel main body;

[0041] 200. Ship plating; 210. Ship plating outer plating; 220. Ship plating inner plating;

[0042] 300. Stern shaft;

[0043] 400. Propeller. Detailed Implementation

[0044] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0045] In the description of this invention, unless otherwise explicitly 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.

[0046] In this invention, unless otherwise explicitly 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 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 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.

[0047] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0048] like Figure 1 As shown, in the ship structure, the stern shaft 300 extends along the fore-and-aft direction of the ship, with its front end connected to the hull plate 200 and its rear end connected to the propeller 400. To adapt to the rapid changes in the structural line of the stern shaft area, the small internal space, and the high stress requirements, the stern shaft area structure is generally designed and constructed by welding the stern shaft cast steel component 100 to the hull plate 200.

[0049] like Figure 2As shown, the existing stern shaft cast steel component 100 typically includes an outer portion 110, which is welded and fixed to the outer plate 210 of the cast steel component body 130, and an inner portion 120, which is welded and fixed to the inner plate 220 of the stern shaft. The outer portion 110 and the inner portion 120 extend forward by the same distance. In the prior art, the welding and fixing of the stern shaft cast steel component 100 to the stern plate 200 is difficult because the relative distance between the outer portion 110 and the inner portion 120 is relatively short. The outer portion 110 and the inner portion 120 interfere with each other, forming an obstacle, resulting in high welding difficulty, low welding quality, and low welding efficiency. Specifically, the welding method between the outer part 110 and the outer plate 210 is a groove-sealing welding, that is, after the outer side of the outer part 110 and the outer side of the outer plate 210 are welded and fixed, a groove needs to be cut on the inner side of the outer part 110 and a sealing welding is performed. The space between the outer part 110 and the inner part 120 is narrow, which obstructs the line of sight of the construction personnel and makes it difficult to adjust the construction equipment to a suitable spatial position. The welding between the inner part 120 and the inner plate 220 of the ship plate requires welding on both sides of the inner part 120. The line of sight of the construction personnel is also obstructed, and the construction equipment is also difficult to adjust to a suitable spatial position.

[0050] To solve the above problems, such as Figure 3 As shown, this embodiment provides a stern shaft cast steel part 100. The stern shaft cast steel component 100 includes a cast steel body 130, an outer connecting part 110, and an inner connecting part 120. The outer connecting part 110 is connected to the front end of the cast steel body 130. The cast steel body 130 has an outer connecting part 110 on both the left and right sides. Each outer connecting part 110 has a mating boss 111 extending along its own extension direction at its front end. The inner side of the mating boss 111 is flush with the inner side of the outer connecting part 110, and the outer side of the mating boss 111 is lower than the outer side of the outer connecting part 110. The outer plate 210 of the ship plate can overlap the outer side of the mating boss 111 and be welded and fixed to the mating boss 111. The inner connecting part 120 is connected to the front end of the cast steel body 130 and sandwiched between the two outer connecting parts 110. The inner connecting part 120 extends forward and extends beyond the radial plane of the ship formed by the front end faces of the two mating bosses 111. The inner connecting part 120 can be welded and fixed to the inner plate 220 of the ship plate.

[0051] The stern shaft cast steel component 100 has a mating boss 111 extending along its own extension direction on the outer part 110, so that the inner side of the mating boss 111 is flush with the inner side of the outer part 110 and the outer side of the mating boss 111 is lower than the outer side of the outer part 110. The outer plate 210 is overlapped on the outer side of the mating boss 111, which facilitates the welding and fixing of the outer part 110 and the outer plate 210. By extending the inner part 120 forward and extending beyond the front end face of the two mating bosses 111 to form the radial plane of the ship, it is easy to weld and fix the inner part 120 and the inner plate 220. This solves the problems of limited construction space and obstructed vision of construction personnel in the prior art, effectively reduces construction difficulty, and improves welding efficiency and welding quality.

[0052] Furthermore, such as Figure 4 As shown, the thickness H1 of the mating boss 111 is 10mm to 15mm, the distance L1 extending along the extension direction of the outer part 110 is 30mm to 50mm, and the distance L2 between the front end face of the outer part 110 and the rear end face of the ship plate outer plate 210 overlapping the outer side of the mating boss 111 is 8mm to 10mm. By defining the extension distance L1, thickness H1, and specific distance L2 between the outer part 110 and the ship plate outer plate 210 overlapping the outer side of the mating boss 111, the precise positioning of the outer part 110 and the ship plate outer plate 210 in real time can be achieved, which not only improves the welding quality and ensures the structural strength after welding, but also improves the welding efficiency.

[0053] Specifically, in this embodiment, the thickness H1 of the mating boss 111 is 10mm, the distance L1 extending along the extension direction of the outer part 110 is 30mm, and the distance L2 between the front end of the outer part 110 and the rear end face of the ship plate outer plate 210 overlapping the outer surface of the mating boss 111 is 8mm. This achieves the goal of minimizing the size of the mating boss 111 while ensuring the strength of the welded structure, thereby improving space utilization efficiency. In other embodiments, the thickness H1 of the mating boss 111 can be arbitrarily adjusted within the range of 10mm to 15mm according to actual needs, the distance L1 extending along the extension direction of the outer part 110 can also be arbitrarily adjusted within the range of 30mm to 50mm according to actual needs, and the distance L2 between the front end face of the outer part 110 and the rear end face of the ship plate outer plate 210 overlapping the outer surface of the mating boss 111 can also be arbitrarily adjusted within the range of 8mm to 10mm according to actual needs. This embodiment does not impose specific limitations on these dimensions.

[0054] Furthermore, the distance L3 between the inner connecting portion 120 extending forward and the front ends of the two mating bosses 111 forming the radial plane of the ship is 50mm to 100mm. Specifically, in this embodiment, the distance L3 between the inner connecting portion 120 extending forward and the front ends of the two mating bosses 111 forming the radial plane of the ship is 50mm. When welding the inner connecting portion 120 to the inner plate 220 of the ship plate or welding the outer connecting portion 110 to the outer plate 210 of the ship plate, since the distance L3 between the inner connecting portion 120 extending forward and the front ends of the two mating bosses 111 forming the radial plane of the ship is 50mm, there is a radial relative distance between the inner connecting portion 120 and the outer connecting portion 110 on the radial plane of the ship. This not only provides construction space for construction equipment but also provides workers with a wide field of vision. In other embodiments, the distance L3 between the front ends of the two docking bosses 111 extending from the inner part 120 and forming the radial plane of the ship can be adjusted arbitrarily within the range of 50mm to 100mm. This embodiment does not impose a specific limitation.

[0055] To further ensure the welding quality of the outer part 110 and the outer plate 210, and the welding quality of the inner part 120 and the inner plate 220, a first welding bevel is provided at the rear end of the outer plate 210, with an inclination angle α of 30°. Second welding bevels are provided on both opposite sides of the inner plate 220, with an inclination angle β of 45° to 55°. This facilitates the welding equipment to weld and fix the outer part 110 to the outer plate 210 along the first welding bevel and to the inner part 120 to the inner plate 220 along the second welding bevel. It should be noted that in this embodiment, the inclination angle β of the second welding bevel is 45°. In other embodiments, the inclination angle β of the second welding bevel can be adjusted arbitrarily within the range of 45° to 55° according to actual needs; this embodiment does not impose a specific limitation.

[0056] Furthermore, in this embodiment, the welding between the inner connection portion 120 and the inner plate 220 is a through weld, and the through distance L4 is ensured to be within 3mm. In addition, to meet the requirements of the through weld, in this embodiment, the minimum thickness of the end of the inner plate 220 that is welded to the inner connection portion 120 must not exceed 3mm.

[0057] It should be noted that during the welding process between the inner connection part 120 and the inner plate 220, the weld on one side of the inner connection part 120 and the inner plate 220 is first performed. After completing the welding on one side, the other side of the inner connection part 120 and the inner plate 220 needs to be grooved and ground until the weld structure on the outer side of the inner connection part 120 and the inner plate 220 can be observed from the inner side of the inner connection part 120 and the inner plate 220, ensuring the penetration weld of the inner connection part 120 and the inner plate 220. Specifically, in this embodiment, the ship is built using a side-casting method. At this time, in order to improve welding efficiency, the weld on the upper end face of the inner connection part 120 and the inner plate 220 is welded first. After completing the weld on the upper end face of the inner connection part 120 and the inner plate 220, the weld on the lower end face of the inner connection part 120 and the inner plate 220 is then performed. Workers first weld the weld between the inner part 120 and the upper end face of the inner plate 220 of the ship plate from top to bottom. This can further reduce the welding difficulty between the inner part 120 and the inner plate 220 of the ship plate, facilitate the welding operation of workers, and improve welding efficiency.

[0058] This embodiment also provides a method for welding the stern shaft cast steel component to the ship plate. For example... Figures 5-11 As shown, this welding method for the stern shaft cast steel component to the ship plate is applied to the aforementioned stern shaft cast steel component 100. The specific welding method includes the following steps:

[0059] 1) Using the gaps on both sides of the inner plate 220 and the inner plate 220 of the ship plate as welds, the inner plate 220 of the ship plate and the inner plate 120 are welded and fixed through the two welds in sequence.

[0060] 2) Overlap the outer plate 210 of the ship plate onto the outer end face of the mating boss 111;

[0061] 3) Use the gap between the front end of the outer part 110 and the rear end of the outer plate 210 as a weld seam, and weld the outer plate 210 and the outer part 110 together along the weld seam to fix them.

[0062] 4) Using the gap between the outer side of the front end of the mating boss 111 and the inner side of the outer plate 210 of the ship plate as the weld seam, weld the outer plate 210 of the ship plate, which has been welded and fixed to the front end of the outer part 110, to the front end of the mating boss 111.

[0063] The welding method for the stern shaft cast steel component and the ship plate, by applying the above-mentioned stern shaft cast steel component 100 to the ship plate 200 and reasonably setting the welding sequence, solves the problems of limited construction space and obstructed vision of construction personnel in the existing technology, effectively reduces construction difficulty, and improves welding efficiency and welding quality.

[0064] Preferably, before welding the inner connection 120 and the inner plate 220, and the outer connection 110 and the outer plate 210, the inner connection 120, the outer connection 110, and the mating boss 111 need to be preheated. By preheating the inner connection 120 and the outer connection 110 before welding them, the temperature difference between the welding area and the workpiece can be reduced. This reduces welding stress and welding strain rate, which helps to avoid welding cracks. Specifically, in this embodiment, the inner connection 120, the outer connection 110, and the mating boss 111 are preheated using an electromagnetic induction preheating device. The electromagnetic induction preheating device itself has a low temperature, a fast preheating speed, and a uniform temperature field distribution in the thickness direction of the cast steel and the plate, which facilitates subsequent welding work.

[0065] Furthermore, the preheating temperature of the inner connection 120, the outer connection 110, and the mating boss 111 is 100℃~150℃. A temperature of 100℃~150℃ is a commonly used preheating temperature for welding to ensure subsequent welding quality. It should be noted that in this embodiment, the inner connection 120 and the inner plate 220 of the ship plate, as well as the outer connection 110 and the outer plate 210 of the ship plate, are both welded using CO2 (carbon dioxide) gas shielded welding.

[0066] Preferably, after the welding of the inner joint 120 and the inner plate 220, the outer joint 110 and the outer plate 210, and the mating boss 111 and the outer plate 210 are completed, the welded and fixed inner joint 120 and inner plate 220, and outer joint 110 and outer plate 210, respectively, need to be heat-insulated. Heat insulation can further reduce residual welding stress, improve the stability of the welded structure, and further ensure welding quality.

[0067] Specifically, in this embodiment, a first welding position 1 is formed between the inner part 120 and the inner plate 220 of the ship plate. After the welding of the inner part 120 and the inner plate 220 is completed, insulation cotton is covered at the first welding position 1 until the first welding position 1 cools down to room temperature. A second welding position 2 is formed between the outer part 110 and the outer plate 210 of the ship plate. After the welding of the outer part 110 and the outer plate 210 of the ship plate is completed, insulation cotton is covered at the second welding position 2 until the second welding position 2 cools down to room temperature. A third welding position 3 is formed between the mating boss 111 and the outer plate 210 of the ship plate. After the welding of the mating boss 111 and the outer plate 210 of the ship plate is completed, insulation cotton is covered at the third welding position 3 until the third welding position 3 cools down to room temperature.

[0068] Preferably, after the welding of the inner part 120 to the inner plate 220 and the outer part 110 to the outer plate 210 is completed, and the first welding position 1, the second welding position 2, and the third welding position 3 have all cooled to room temperature, the welding quality of the first welding position 1, the second welding position 2, and the third welding position 3 is inspected. By inspecting the welding quality of the first welding position 1, the second welding position 2, and the third welding position 3, finished welds and defective welds can be separated, ensuring the service life and operational safety of the ship.

[0069] Specifically, in this embodiment, since the welding depths of the first welding position 1 and the second welding position 2 are relatively deep, to ensure detection accuracy, the welding quality of the first welding position 1 and the second welding position 2 is detected using a combination of ultrasonic testing and magnetic particle testing. The welding quality of the third welding position 3 is detected using magnetic particle testing. Ultrasonic testing has strong penetrating power and can detect areas with greater depths, while magnetic particle testing has weaker penetrating power and is suitable for surface detection.

[0070] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A welding method for a stern shaft cast steel component to a ship plate, wherein the stern shaft cast steel component comprises: Cast steel body (130); An external connection (110) is connected to the front end of the main body (130) of the cast steel component. The main body (130) of the cast steel component has external connections (110) on both its left and right sides. Each external connection (110) has a mating boss (111) extending along its own extension direction at its front end. The inner surface of the mating boss (111) is flush with the inner surface of the external connection (110), and the outer surface of the mating boss (111) is lower than the outer surface of the external connection (110). The outer plate (210) of the ship plate can overlap the outer surface of the mating boss (111) and be welded and fixed to the mating boss (111). The inner connection (120) is connected to the front end of the main body of the cast steel part (130) and sandwiched between the two outer connections (110). The inner connection (120) extends forward and protrudes from the front end faces of the two docking bosses (111) to form the radial plane of the ship. The inner connection (120) can be welded and fixed to the inner plate (220) of the ship plate. Its features include the following steps: Using the gaps on both sides of the inner part (120) and the inner plate (220) of the ship plate as welds, the inner plate (220) of the ship plate and the inner part (120) are welded and fixed through the two welds in sequence; The outer plate (210) of the ship plate is overlapped on the outer end face of the docking boss (111); Using the gap between the front end of the outer part (110) and the rear end of the outer plate (210) as the weld seam, the outer plate (210) and the outer part (110) are welded and fixed together along the weld seam. Using the gap between the outer side of the front end of the docking boss (111) and the inner side of the outer plate of the ship plate (210) as the weld seam, the outer plate of the ship plate (210), which has been welded and fixed to the front end of the outer part (110), is welded and fixed to the front end of the docking boss (111).

2. The welding method for the stern shaft cast steel component and the ship plate according to claim 1, characterized in that, The thickness H1 of the docking boss (111) is 10mm to 15mm, the extension distance L1 of the docking boss (111) along the extension direction of the outer part (110) is 30mm to 50mm, and the distance L2 between the front end face of the outer part (110) and the rear end face of the ship plate outer plate (210) overlapping the outer side of the docking boss (111) is 8mm to 10mm.

3. The welding method for the stern shaft cast steel component and the ship plate according to claim 1, characterized in that, The distance L3 between the inner part (120) extending forward and the front ends of the two docking bosses (111) forming the radial plane of the ship is 50-100 mm.

4. The welding method for the stern shaft cast steel component and the ship plate according to claim 1, characterized in that, Before welding the inner part (120) and the inner plate (220) of the ship plate, as well as the outer part (110) and the outer plate (210) of the ship plate, the inner part (120), the outer part (110) and the mating boss (111) need to be preheated respectively.

5. The welding method for the stern shaft cast steel component and the ship plate according to claim 4, characterized in that, The preheating temperature of the inner part (120) and the outer part (110) is 100℃~150℃.

6. The welding method for the stern shaft cast steel component and the ship plate according to claim 1, characterized in that, After the welding of the inner part (120) and the inner plate (220) of the ship plate, as well as the outer part (110) and the outer plate (210) of the ship plate, is completed, the inner part (120) and the inner plate (220), the outer part (110) and the outer plate (210), and the mating boss (111) and the outer plate (210) of the ship plate, which have been welded and fixed, need to be heat-insulated.

7. The welding method for the stern shaft cast steel component and the ship plate according to claim 1, characterized in that, After completing the welding of any one of the two welds between the inner part (120) and the inner plate (220) of the ship plate, the unwelded weld is grooved and ground until the weld that has been welded is connected to the unwelded weld.

8. The welding method for the stern shaft cast steel component and the ship plate according to claim 1, characterized in that, After the welding of the inner part (120) to the inner plate (220) and the outer part (110) to the outer plate (210) is completed, the welding quality of the welding between the inner part (120) and the inner plate (220), the outer part (110) and the outer plate (210), and the mating boss (111) and the outer plate (210) is inspected.

9. The welding method for the stern shaft cast steel component and the ship plate according to claim 8, characterized in that, The welding quality is inspected by a combination of ultrasonic testing and magnetic particle testing between the inner part (120) and the inner plate (220) of the ship plate, and between the outer part (110) and the outer plate (210) of the ship plate. The welding quality is inspected by magnetic particle testing between the mating boss (111) and the outer plate (210) of the ship plate.

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