Method for welding a through-penetration cylinder and production process of a liquid cargo tank

Abstract

The application discloses a method for assembling and welding a through-cabin cylinder and a liquid cargo cabin production process. The method for assembling and welding the through-cabin cylinder comprises the following steps: setting a reinforcing assembly, the reinforcing assembly comprising a reinforcing ring plate and a fastener; preparing the reinforcing assembly and pre-tightening the reinforcing assembly, so that the reinforcing ring plate radially presses the outer wall of the through-cabin cylinder; and then welding the annular gap between the through-cabin cylinder and the tank body. The pre-tightening force of the reinforcing assembly is converted into the radial constraint force of the circumferential wall surface of the through-cabin cylinder by the reinforcing ring plate, so that a rigid clamp system is formed. The adjustable rigid restraint system is introduced in the welding process to resist the welding thermal stress in real time, the release path of the welding stress is changed, the radial expansion force that may cause the oval deformation of the through-cabin cylinder is effectively offset, the deformation in the welding process is effectively constrained, the roundness of the through-cabin cylinder is ensured, and the active prevention of deformation is realized instead of post-correction, compared with the traditional process.

Description

Technical Field

[0001] This application relates to the field of liquid cargo tank assembly and welding technology, and in particular to a welding method for inserting a tank shell, as well as a liquid cargo tank manufacturing process. Background Technology

[0002] In the manufacturing of Type C cargo tanks, the manhole cover is a critical component, used to allow personnel to enter the tank. It needs to penetrate the main shell of the tank. Specifically, one end of the manhole cover connects to the internal structure of the tank, while the other end needs to be precisely welded to the external manhole flange to ensure overall sealing and structural strength. The manhole cover separates the different media on both sides (seawater and the liquid inside the tank) to prevent the tank walls from being directly deformed by pressure; therefore, the manhole cover has high strength and welding requirements.

[0003] In related technologies, the welding method for the manhole shell is as follows: the manhole shell is spot-welded to the shell and then directly welded, relying on post-weld straightening to ensure accuracy.

[0004] The above welding method has the following problems:

[0005] Firstly, severe welding deformation: Due to the large amount of welding at the connection between the manhole cylinder and the shell through the compartment, the concentrated heat input generated during the welding process will cause uneven thermal stress in the cylinder, which makes the cylinder, especially the end connected to the manhole flange, prone to elliptical deformation.

[0006] Secondly, roundness is difficult to guarantee: Excessive roundness at the end of the cylinder will directly lead to misalignment of the subsequent manhole flange installation, sealing failure, and even require a lot of on-site repair work, which seriously affects installation efficiency and quality.

[0007] Third, correction is difficult: the correction of elliptical deformation after welding is difficult and usually requires flame correction or mechanical forced correction, which is not only time-consuming and labor-intensive, but may also damage the material properties. Summary of the Invention

[0008] This application aims to at least partially address one of the aforementioned technical problems in the prior art. To this end, embodiments of this application provide a welding method for a through-hull cylinder, which can effectively constrain welding deformation during the welding process and ensure the roundness of the through-hull cylinder.

[0009] This application also provides a liquid cargo tank production process.

[0010] According to an embodiment of the first aspect of this application, a method for welding a through-tank cylinder is provided for welding the through-tank cylinder to a tank body. The method for welding the through-tank cylinder includes the following steps:

[0011] Beveling steps: Make a connection hole on the tank body, and then bevel the edge of the connection hole;

[0012] Reinforcement component preparation steps: Prepare the reinforcement component, which includes a reinforcing ring plate and fasteners. The reinforcing ring plate is annular and forms a constraining inner ring. The reinforcing ring plate includes multiple reinforcing sub-plates connected end to end in sequence. The reinforcing sub-plates are arc-shaped and rigid. The fasteners are used to connect and lock two adjacent reinforcing sub-plates. The reinforcing ring plate is sleeved on the outside of the penetration cylinder. The constraining inner ring mates with the outer wall of the penetration cylinder.

[0013] Installation steps for the transom tank body: Pass the transom tank body through the connecting hole on the tank body, and spot weld the transom tank body to the tank body for fixation;

[0014] Pre-tightening step: Install the fasteners, connect and lock each of the reinforcing plates, so that the inner constraint ring of the reinforcing ring plate is attached to and radially presses against the outer wall of the through-chamber cylinder;

[0015] Welding steps: The connection weld between the pier cylinder and the tank body is a circumferential weld. The circumferential weld is welded under the pre-tightening force constraint of the reinforcing component.

[0016] Post-processing step: Remove the reinforcing components.

[0017] In an optional or preferred embodiment, the reinforcing ring plate includes several equally divided reinforcing sub-plates connected end to end, the reinforcing sub-plates are arc-shaped, and the fasteners connect two adjacent reinforcing sub-plates.

[0018] In an optional or preferred embodiment, the first end face and / or the second end face of both ends of the reinforcing plate are provided with a connecting portion, and the connecting portion is provided with a mounting hole. The fastener passes through the mounting hole of the connecting portion located on the same side on the adjacent ends of the two adjacent reinforcing plates and locks it, so that the two adjacent reinforcing plates are tightly connected.

[0019] In an optional or preferred embodiment, when the fastener is not tightened, there is a predetermined gap that is not zero between two adjacent reinforcing plates; when the fastener is tightened, the predetermined gap between two adjacent reinforcing plates is zero.

[0020] In an optional or preferred embodiment, the number of reinforcing plates is even. In the pre-tightening step, each reinforcing plate is symmetrically and stepwise locked, thereby applying a uniform pre-tightening force perpendicular to the wall of the through-cabin cylinder to the reinforcing ring plate, forming a radial constraint on the through-cabin cylinder.

[0021] In an optional or preferred embodiment, the curvature of the reinforcing plate is ≤180°.

[0022] In an optional or preferred embodiment, the circumferential seam includes a plurality of evenly divided segmented welds, and two oppositely arranged and symmetrical segmented welds form a welding group. The welding steps include the following steps:

[0023] Select one of the welding groups as the welding object, and weld the two segmented welds of the welding group;

[0024] Select another welding group adjacent to the previous welding group as the welding object, and weld the two segmented welds of the welding group.

[0025] Repeatedly select the welding group and perform welding until the circumferential seam is welded.

[0026] In an optional or preferred embodiment, the welding method for the through-chamber cylinder further includes the following steps:

[0027] Inspection and flange welding steps: Inspect the actual roundness of the free end of the through-hole cylinder. If the actual roundness is less than or equal to the predetermined roundness, install and weld the manhole flange to the free end of the through-hole cylinder.

[0028] In an optional or preferred embodiment, the pre-tightening step further includes the following steps:

[0029] Adjust the position of the reinforcing ring plate to a preset installation area, which is the middle position between the circumferential seam and the free end of the through-chamber cylinder.

[0030] In an optional or preferred embodiment, the post-processing step specifically includes: waiting for the circumferential seam to cool completely to room temperature before removing the reinforcing component.

[0031] According to an embodiment of the second aspect of this application, a liquid cargo tank manufacturing process is provided, which uses the above-described welding method for the through-tank cylinder to weld the through-tank cylinder to the tank body of the liquid cargo tank.

[0032] Based on the above technical solution, the embodiments of this application have at least the following beneficial effects:

[0033] The above technical solution, by setting up a reinforcing component, including a reinforcing ring plate and fasteners, and the reinforcing ring plate including several reinforcing sub-plates, is fitted onto the outside of the transom shell. The fasteners can lock and connect adjacent reinforcing sub-plates. After the preparation and pre-tightening steps of the reinforcing component, the inner ring of the reinforcing ring plate radially presses against the outer wall of the transom shell. Then, the welding step is performed to weld the circumferential seam between the transom shell and the tank body. The reinforcing sub-plates have strong rigidity. The pre-tightening force of the reinforcing component is converted into a radial constraint force on the circumferential wall of the transom shell through the reinforcing ring plate, forming a rigid clamping system. By introducing this adjustable rigid restraint system during the welding process, it counteracts the welding thermal stress in real time, fundamentally changing the release path of welding stress. It effectively cancels the radial expansion force that may cause elliptical deformation of the transom shell, effectively restrains the deformation during the welding process, and ensures the roundness of the transom shell. Compared with the traditional "weld first, then correct" process, this solution achieves active prevention of deformation rather than post-correction. Furthermore, once the reinforcement components are assembled and welded, they can be removed and reused without constituting a permanent structure, resulting in low cost and high efficiency. Attached Figure Description

[0034] The present application will be further described below with reference to the accompanying drawings and embodiments;

[0035] Figure 1 This is a structural schematic diagram of the liquid cargo tank in an embodiment of this application;

[0036] Figure 2 This is a schematic diagram of the structure of the through-tank shell and the tank body welded together according to an embodiment of this application;

[0037] Figure 3 This is an embodiment of the present application. Figure 2 A partial enlarged view of section A, where the central tunnel shell connects to the tank body;

[0038] Figure 4 This is an embodiment of the present application. Figure 2 A sectional view of section BB;

[0039] Figure 5 This is a cross-sectional view of the reinforcing ring plate in an embodiment of this application at the connection position of the two reinforcing plates, showing four fasteners;

[0040] Figure 6 This is a diagram showing the welding sequence of each segment of the circumferential weld in an embodiment of this application;

[0041] Figure label:

[0042] 100 through-tank shell, 110 pre-installed installation area, 200 tank body, 210 connecting hole, 300 reinforcing component, 310 reinforcing ring plate, 311 restraining inner ring, 312 reinforcing plate, 3121 connecting part, 3122 mounting hole, 320 fastener, 321 bolt, 322 nut, 323 first fastener, 324 second fastener, 325 third fastener, 326 fourth fastener, 400 manhole flange, 500 circumferential seam. Detailed Implementation

[0043] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0044] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0047] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0048] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0049] Reference Figure 1 The liquid cargo tank includes a transom hull 100 and a tank 200.

[0050] Reference Figures 1 to 6 This embodiment describes a welding method for connecting a sump tube 100 to a tank body 200. The welding method for the sump tube 100 includes the following steps:

[0051] S100, Beveling Step: A connection hole 210 is made on the tank body 200, and then a bevel is made on the edge of the connection hole 210. The connection hole 210 is used to connect with the transom body 100.

[0052] S200, Reinforcing Component Preparation Steps: Prepare a reinforcing component 300, which includes a reinforcing ring plate 310 and fasteners 320. The reinforcing ring plate 310 is annular and forms a constraining inner ring 311. The reinforcing ring plate 310 includes multiple reinforcing sub-plates 312 connected end-to-end in sequence. The reinforcing sub-plates 312 are arc-shaped and have high rigidity. Fasteners 320 are used to connect and lock adjacent reinforcing sub-plates 312. The reinforcing ring plate 310 is fitted onto the outside of the penetration cylinder 100, and the constraining inner ring 311 mates with the outer wall of the penetration cylinder 100. The diameter of the constraining inner ring 311 matches the outer diameter of the penetration cylinder 100.

[0053] S300, Installation steps for the transom shell 100: Pass the transom shell 100 through the connecting hole 210 on the tank body 200, adjust the axial position and angle of the transom shell 100 so that the axial line of the transom shell 100 is basically coincident with the axial line of the connecting hole 210, and avoid tilting the transom shell 100. Then spot weld the transom shell 100 to the tank body 200 to fix the position of the transom shell 100 on the connecting hole 210.

[0054] S400, Pre-tightening step. The pre-tightening step specifically includes the following steps:

[0055] S410, the position of the adjusting reinforcing ring plate 310 is in the preset installation area 110, which is the middle position between the circumferential seam 500 and the free end of the through-hole cylinder 100. The free end of the through-hole cylinder 100 is the end away from the welded connection between the through-hole cylinder 100 and the tank body 200, that is, the end located on the outside of the tank body 200 that is subsequently connected to the manhole flange 400.

[0056] It is understood that the central position does not necessarily have to be in the middle between the circumferential seam 500 and the free end of the through-hole cylinder 100; it can also be near the middle position. Setting the preset installation area 110 in the central position ensures that it avoids affecting the subsequent welding operation of the circumferential seam 500, while being as close as possible to the location of the circumferential seam 500, so as to effectively suppress the deformation of the through-hole cylinder 100 at the welding position of the circumferential seam 500.

[0057] S420. Install fasteners 320, connect and lock each reinforcing ring plate 310. Specifically, connect each reinforcing sub-plate 312 with fasteners and then lock them, so that the constraint inner ring 311 of the reinforcing ring plate 310 fits against and radially presses against the outer wall of the through-chamber cylinder 100.

[0058] S500, Welding steps: The connection weld between the pier cylinder 100 and the tank body 200 is a circumferential weld 500. Under the pre-tightening force constraint of the reinforcing component 300, the circumferential weld 500 is welded.

[0059] S600, Post-processing steps: Remove reinforcement component 300.

[0060] S700 Inspection and Flange Welding Procedure: Inspect the actual roundness of the free end of the through-hole cylinder 100. If the actual roundness is less than or equal to the predetermined roundness, install and weld the manhole flange 400 to the free end of the through-hole cylinder 100. Inspect the roundness of the through-hole cylinder 100 to ensure that the roundness of its free end meets the requirements before welding the manhole flange 400. This verifies the effectiveness of the restraint function of the reinforcing component 300 and ensures welding quality.

[0061] This technical solution involves setting up a reinforcing assembly 300, which includes a reinforcing ring plate 310 and fasteners 320. The reinforcing ring plate 310 includes several reinforcing sub-plates 312. The reinforcing ring plate 310 is sleeved on the outside of the transom shell 100. The fasteners 320 can lock and connect adjacent reinforcing sub-plates 312. Through the reinforcing assembly preparation and pre-tightening steps, the inner constraint ring 311 of the reinforcing ring plate 310 radially presses against the outer wall of the transom shell 100. Then, a welding step is performed to weld the circumferential seam 500 between the transom shell 100 and the tank body 200. The reinforcing plate has high rigidity. The pre-tightening force of the reinforcing component 300 is converted into a radial constraint force on the circumferential wall of the through-hole cylinder 100 through the reinforcing ring plate 310, forming a rigid clamping system. By introducing this adjustable rigid restraint system during the welding process, it counteracts the welding thermal stress in real time, fundamentally changing the release path of the welding stress. It effectively cancels the radial expansion force that may cause elliptical deformation of the through-hole cylinder 100, effectively restrains the elliptical deformation during the welding process, and ensures the roundness of the through-hole cylinder 100, especially the end welded to the manhole flange 400.

[0062] Compared to the traditional "welding first, then correction" process, this solution achieves proactive prevention of deformation rather than post-deformation correction, eliminating the cumbersome post-weld correction process, shortening the production cycle, and avoiding secondary damage caused by correction, thereby improving the overall structural quality and reliability.

[0063] The reinforcement component 300 is a temporary tooling system. After the welding is completed, the reinforcement component 300 can be removed and reused for the welding of the through-tank cylinder 100 and tank 200 of another liquid cargo tank. It does not constitute a permanent structure and is low in cost and efficient.

[0064] Understandably, the curvature of each reinforcing plate 312 can be set to be the same or different. Dividing the reinforcing ring plate 310 into several equally divided reinforcing plates 312, that is, each reinforcing plate 312 having the same curvature, and each reinforcing plate 312 radially pressing against the outer wall of the through-hole cylinder 100, can make the radial constraint force of the reinforcing ring plate 310 on the through-hole cylinder 100 more uniform. The number of reinforcing plates 312 can be set as needed, with two to four being preferable.

[0065] Specifically, the curvature of each reinforcing plate 312 is ≤180° to avoid uneven radial constraint force of the reinforcing plate 312 on the transom cylinder 100.

[0066] Reference Figure 5In a specific embodiment, each of the two ends of the reinforcing plate 312 is provided with a connecting portion 3121 on its first end face and second end face. The connecting portion 3121 is provided with a mounting hole 3122. A fastener 320 passes through the mounting hole 3122 of the connecting portion 3121 located on the same side (both upper or both lower) on adjacent ends of two adjacent reinforcing plates 312 and is locked in place, thus tightly connecting the two adjacent reinforcing plates 312. The fastener 320 is installed through the connecting portion 3121 and the connecting hole 210, thereby connecting the two adjacent reinforcing plates 312.

[0067] It is understood that in some other embodiments, the connecting portion 3121 can be provided only on the first end face or the second end face at both ends of the reinforcing plate 312, which can also achieve the connection between adjacent reinforcing plates 312. Providing the connecting portion 3121 on both the first end face and the second end face can improve the uniformity of the radial constraint force.

[0068] The force exerted by the fastener 320 on the reinforcing plate 312 is tangential to the circumference, causing adjacent reinforcing plates 312 to come into contact. Since the reinforcing ring plate 310 is fitted onto the through-cabin cylinder 100, this force is converted into a radial force on the through-cabin cylinder 100. Connecting portions 3121 are provided on the upper and lower sides of both ends of the fastener 320, which avoids uneven force application at the upper and lower ends and improves the uniformity of the radial constraint force on the through-cabin cylinder 100.

[0069] Specifically, the fastener 320 is fastened by a threaded fastening method and includes a high-strength bolt 321, a nut 322, and a washer. The bolt 321 passes through the washer and the mounting holes 3122 on the same side of the adjacent ends of the two adjacent reinforcing plates 312 in sequence, and then the nut 322 is tightened.

[0070] In some embodiments, when the fastener 320 is not locked, there is a predetermined gap that is not zero between two adjacent reinforcing plates 312, which facilitates the overall fitting of the reinforcing ring plate 310 and the adjustment of the position of the reinforcing ring plate 310; see reference Figure 5 When the fastener 320 is tightened, the gap between two adjacent reinforcing plates 312 is 0 (or close to 0). This can prevent gaps from forming between the reinforcing plates 312 after tightening, which would prevent the gaps from forming an effective radial constraint force on the transom 100.

[0071] In optional or preferred embodiments, the number of reinforcing plates 312 is even. In the pre-tightening step S420, each reinforcing plate 312 is symmetrically and stepwise locked, and a uniform pre-tightening force perpendicular to the wall of the through-cabin cylinder 100 is applied to the reinforcing ring plate 310 to form a radial constraint on the through-cabin cylinder 100.

[0072] Reference Figure 4 and Figure 5Specifically, in this embodiment, there are two reinforcing plates 312, which are semi-circular in shape. Correspondingly, there are four fasteners 320: a first fastener 323, a second fastener 324, a third fastener 325, and a fourth fastener 326. The first fastener 323 and the second fastener 324 are respectively located on the upper and lower sides of one adjacent end of the two reinforcing plates 312, while the third fastener 325 and the fourth fastener 326 are respectively located on the upper and lower sides of the other adjacent end. The symmetrical, step-by-step locking of each reinforcing plate 312 specifically includes the following steps:

[0073] S421, Tighten the first fastener 323 (specifically, tighten the bolt 321 and / or nut 322 of the first fastener 323 so that they rotate relative to each other) by half a turn or 1 / 4 turn;

[0074] S422, tighten the fourth fastener 326 by half a turn or 1 / 4 turn;

[0075] S423, tighten the second fastener 324 by half a turn or 1 / 4 turn;

[0076] S424, tighten the third fastener 325 half a turn or 1 / 4 turn;

[0077] Repeat steps S421 to S424 until all fasteners 320 are fully tightened, so that the gap between the two reinforcing plates 312 is 0 or close to 0.

[0078] In this way, the symmetrical and step-by-step locking of each reinforcing plate 312 can ensure that a uniform pre-tightening force is applied to the reinforcing ring plate 310, which is perpendicular to the wall of the through-hole cylinder 100, and is also a uniform constraint force on the through-hole cylinder 100.

[0079] It is understood that in some other embodiments, the reinforcing ring plate 310 can also be a single plate with a notch at a certain position. The two ends of the reinforcing ring plate 310 are close together, and a connecting part 3121 and a connecting hole 210 are provided on the first and second end faces of both ends of the reinforcing sub-plate 312, which are connected by fasteners 320. In this way, the pre-tightening constraint effect on the transom shell 100 can also be achieved. However, compared with the above method of using an even number of equally divided reinforcing sub-plates 312, each reinforcing sub-plate 312 can provide a more uniform constraint force, avoiding micro-deformation of the transom shell 100 due to uneven constraint force.

[0080] In some embodiments, the circumferential weld 500 includes a plurality of evenly divided segmented welds, and two oppositely arranged and symmetrical segmented welds constitute a welding group. The welding step S500 includes the following steps:

[0081] S510. Select one of the welding groups as the welding object, and weld the two segmented welds of the welding group.

[0082] S520. Select another welding group adjacent to the previous welding group as the welding object, and weld the two segmented welds of the welding group.

[0083] S530. Repeatedly select the welding group and perform welding until the circumferential weld of 500 is completed.

[0084] Under the pre-tightening constraint of the reinforcing component 300, the circumferential seam 500 is welded. The welding adopts a symmetrical and segmented welding method to further reduce the unevenness of welding heat input and reduce thermal deformation.

[0085] Reference Figure 6 Specifically, the circumferential weld 500 in this embodiment includes six segmented welds, namely two #1 segmented welds, two #2 segmented welds, and two #3 segmented welds. Two segmented welds with the same number belong to the same welding group and are welded symmetrically in a clockwise direction. The specific welding sequence is as follows: weld the two #1 segmented welds; in a clockwise direction, select two #2 segmented welds adjacent to the #1 segmented welds and weld the two #2 segmented welds; in a clockwise direction, select two #3 segmented welds adjacent to the #2 segmented welds and weld the two #3 segmented welds.

[0086] In some embodiments, the post-processing step S600 specifically includes: waiting for the circumferential seam 500 to completely cool to room temperature before removing the reinforcing component 300. Waiting for the circumferential seam 500 to cool before removing the reinforcing component 300 can fully release residual welding stress, avoid weld cracking and deformation, and ensure weld formation.

[0087] This application also provides a liquid cargo tank manufacturing process, which uses the above-mentioned welding method for the through-tank cylinder 100 to weld the through-tank cylinder 100 to the tank body 200 of the liquid cargo tank.

[0088] In the production process of liquid cargo tanks, the above-mentioned welding method for the through-tank cylinder 100 is used to weld the through-tank cylinder 100 to the tank body 200 of the liquid cargo tank. This method can effectively constrain the welding deformation of the through-tank cylinder 100 during the welding process, ensure the roundness of the through-tank cylinder 100, and improve the welding quality and efficiency.

[0089] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A method for welding a through-tank cylinder to a tank body, characterized in that, The welding method for the through-tank shell includes the following steps: Beveling steps: Make a connection hole on the tank body, and then bevel the edge of the connection hole; Reinforcement component preparation steps: Prepare the reinforcement component, which includes a reinforcing ring plate and fasteners. The reinforcing ring plate is annular and has a constrained inner ring. The reinforcing ring plate includes multiple reinforcing sub-plates connected end to end in sequence. The reinforcing sub-plates are arc-shaped and rigid. The fasteners are used to connect and lock two adjacent reinforcing sub-plates. The reinforcing ring plate is sleeved on the outside of the penetration cylinder. The constrained inner ring of the reinforcing ring plate mates with the outer wall of the penetration cylinder. Installation steps for the transom tank body: Pass the transom tank body through the connecting hole on the tank body, and spot weld the transom tank body to the tank body for fixation; Pre-tightening step: Install the fasteners, connect and lock each of the reinforcing plates, so that the inner constraint ring of the reinforcing ring plate is attached to and radially presses against the outer wall of the through-chamber cylinder; Welding steps: The connection weld between the pier cylinder and the tank body is a circumferential weld. The circumferential weld is welded under the pre-tightening force constraint of the reinforcing component. Post-processing step: Remove the reinforcing components.

2. The welding method for the through-tank cylinder according to claim 1, characterized in that: The first end face and / or the second end face of both ends of the reinforcing plate are provided with connecting portions, and the connecting portions are provided with mounting holes. The fastener passes through the mounting holes of the connecting portions located on the same side of the adjacent ends of the two adjacent reinforcing plates and locks them, so that the two adjacent reinforcing plates are tightly connected.

3. The welding method for the through-tank cylinder according to claim 1, characterized in that: When the fastener is not tightened, there is a predetermined gap that is not zero between two adjacent reinforcing plates; when the fastener is tightened, the predetermined gap between two adjacent reinforcing plates is zero.

4. The welding method for the through-tank cylinder according to claim 1, characterized in that, The number of reinforcing plates is even. In the pre-tightening step, each reinforcing plate is symmetrically and stepwise locked, thereby applying a pre-tightening force perpendicular to the wall of the through-cabin cylinder to the reinforcing ring plate, forming a radial constraint on the through-cabin cylinder.

5. The welding method for the through-tank cylinder according to claim 1, characterized in that: The curvature of the reinforcing plate is ≤180°.

6. The welding method for the through-tank cylinder according to any one of claims 1 to 5, characterized in that, The circumferential seam includes several evenly divided segmented welds. Two oppositely arranged and symmetrical segmented welds form a welding group. The welding steps include the following steps: Select one of the welding groups as the welding object, and weld the two segmented welds of the welding group; Select another welding group adjacent to the previous welding group as the welding object, and weld the two segmented welds of the welding group. Repeatedly select the welding group and perform welding until the circumferential seam is welded.

7. The welding method for the through-tank cylinder according to claim 1, characterized in that, The welding method for the through-tank shell also includes the following steps: Inspection and flange welding steps: Inspect the actual roundness of the free end of the through-hole cylinder. If the actual roundness is less than or equal to the predetermined roundness, install and weld the manhole flange to the free end of the through-hole cylinder.

8. The welding method for the through-tank cylinder according to claim 1, characterized in that, The pre-tightening step also includes the following steps: The position of the reinforcing ring plate is adjusted to a preset installation area, which is the middle position between the circumferential seam and the free end of the through-chamber cylinder.

9. The welding method for the through-tank cylinder according to claim 1, characterized in that, The post-processing steps specifically include: waiting for the circumferential seam to cool completely to room temperature before removing the reinforcing component.

10. A liquid cargo tank manufacturing process, characterized in that: The through-tank cylinder is welded to the tank body of the liquid cargo tank using the welding method described in any one of claims 1 to 9.

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