Welding structure and welding method for connecting anchor chains on mooring suction anchor

Abstract

The invention discloses a welding structure for anchor chain connection on a mooring suction anchor, the welding structure for anchor chain connection on the mooring suction anchor comprises a suction anchor barrel section, the suction anchor barrel section is welded between a first suction anchor barrel body and a second suction anchor barrel body, and a first square hole and a second square hole are formed in the side wall of the suction anchor barrel section; the suction anchor further comprises a concentric-square-shaped transition plate and a reinforcing plate, the concentric-square-shaped transition plate is welded in the first square hole, the reinforcing plate is welded in the second square hole, a casting anchor lug is welded in the concentric-square-shaped transition plate, the casting anchor lug is connected with the reinforcing plate through a connecting plate, and auxiliary hoisting of the suction anchor and connection of the suction anchor and an external mooring anchor head chain are achieved through the casting anchor lug. The invention further discloses a welding method for anchor chain connection on the mooring suction anchor. According to the welding structure and method for connecting the anchor chains on the mooring suction anchor, the structural design is simple, assembling and welding are convenient and fast, and the structural strength and stability of the suction anchor are improved. Therefore, the connection with an external mooring anchor head chain is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of suction anchor manufacturing, and in particular relates to a welding structure and a welding method for connecting an anchor chain on a mooring suction anchor. Background Art

[0002] With the exploration and development of deep-water oil and gas fields, the technology of floating facilities such as floating production storage and offloading units (FPSO) and floating wind power platforms moored with seabed suction anchors has been widely developed and applied. The suction anchor is buried in the seabed as a pile foundation and is firmly fixed to the seabed under the action of suction. The lower 2 / 3 of the suction anchor is equipped with an anchor chain welding connection structure, and is connected to floating facilities such as FPSO and floating wind power platforms through the anchor head chain, seabed chain, anchor cable and hull chain of the mooring system, providing them with safe and reliable anchoring and fixed positioning.

[0003] As an important part of the floating facility mooring system, the suction anchor's anchor chain connection structure selection design and welding method are crucial to the reliability of the entire mooring system. It must be ensured that it can withstand large vertical and horizontal anchor chain mooring tension for a long time in harsh marine environments and has good fatigue load resistance. At present, there are many welding structure selection designs for anchor chain connections on mooring suction anchors in the marine engineering field, and the welding methods are different, but most of them have some limitations, such as mismatched material selection, unreasonable layout, complex and redundant structure, difficult welding, uneven stress distribution, etc., which cannot well guarantee the mooring load requirements of floating facilities and affect the mooring safety.

[0004] Therefore, it is urgent to design a welding structure and welding method for connecting the anchor chain on the mooring suction anchor to solve the problems of complex structural design, difficult assembly and welding, and uneven stress distribution of the existing anchor chain connection structure mentioned above. Summary of the invention

[0005] In order to solve the technical problems of complex structural design, great difficulty in assembly welding and uneven stress distribution of the existing anchor chain connection structure mentioned in the background technology, a welding structure and welding method for the anchor chain connection on a mooring suction anchor are provided to solve the above problems.

[0006] To achieve the above-mentioned purpose, the specific technical scheme of the welding structure and welding method for connecting the anchor chain on the mooring suction anchor of the present invention is as follows: A welding structure for connecting an anchor chain on a mooring suction anchor comprises a suction anchor barrel section, which is welded between a first suction anchor barrel body and a second suction anchor barrel body, and a first square hole and a second square hole are provided on a side wall of the suction anchor barrel section. The structure also comprises a circular transition plate and a reinforcement plate, wherein the circular transition plate is welded in the first square hole, and the reinforcement plate is welded in the second square hole. A casting anchor ear is welded in the circular transition plate, and the casting anchor ear is connected to the reinforcement plate by a connecting plate. The casting anchor ear is used to realize auxiliary lifting of the suction anchor and connection with an external mooring anchor head chain.

[0007] Furthermore, the casting anchor ear includes an anchor ear plate, a handle and a long boss. The long boss is arranged on a side of the anchor ear plate close to the reinforcing plate, and a handle is arranged on a side of the anchor ear plate away from the reinforcing plate. The long boss is connected to one end of the connecting plate, and the handle is connected to the sling.

[0008] Furthermore, the reinforcing plate, the round-shaped transition plate and the anchor ear plate are all arc-shaped structures, and the arc is the same as the arc of the suction anchor cylinder section.

[0009] A welding method for connecting an anchor chain on a mooring suction anchor comprises the following steps: S1. Loft and mark the suction anchor cylinder section, mark the marking lines of the first square hole and the second square hole on the front and rear sides, perform thermal cutting to open the holes, and process the grooves; S2. Loft and mark the circular transition plate, reinforcement plate and connection plate, and perform thermal cutting to cut the material and process the groove; S3, aligning the reinforcing plate assembly into the second square hole and performing joint welding; S4. Mark out the inner side of the reinforcement plate to mark the group identification line connected to the connection plate; S5. Assemble one end of the connecting plate close to the reinforcing plate to the reinforcing plate in the suction anchor cylinder section and weld the joint; S6. Assemble the anchor ears of the casting into the circular transition plate; S7, assembling the circular transition plate and the casting anchor ear as a whole into the first square hole, and assembling one end of the connecting plate close to the casting anchor ear with the long strip boss on the casting anchor ear; S8. Weld the joints between the anchor ear of the casting and the round-shaped transition plate, the joints between the round-shaped transition plate and the suction anchor cylinder, and the joints between the connecting plate and the long boss in sequence.

[0010] Furthermore, the first square hole and the second square hole are opened by thermal cutting, the circular transition plate and the reinforcement plate are cut by thermal cutting, the straight edge sections are flame cut by a semi-automatic magnetic cutting machine, the four rounded corners are flame cut by hand, the bevel is prepared in the form of an X-shaped joint with a larger inside and a smaller outside, the bevels at both ends of the connecting plate are flame cut by a semi-automatic magnetic cutting machine, and the bevel is prepared in the form of an asymmetric K-shaped joint.

[0011] Further, in step S3, the tack weld is fixed at the root of the groove, the straight side welds are welded by SAW mechanical welding, and the four corner fillet welds are welded by FCAW manual welding.

[0012] Further, in step S5, the positioning welding point is fixed at the root of the groove, and the unassembled end of the connecting plate away from the reinforcing plate needs to be temporarily supported and fixed, and the weld is manually welded by FCAW.

[0013] Further, in step S7, the integral component assembly of the roundabout transition plate and the casting anchor ear needs to be finely adjusted in orientation when it is aligned with the first square hole, so that the handle of the casting anchor ear is coaxial with the central axis of the suction anchor cylinder, and then the welding points are fixed, the positioning welding points are fixed at the root of the groove, and the connection plate and the long strip boss are fixed at the root of the groove.

[0014] Furthermore, when welding the joints between the reinforcement plate and the suction anchor barrel, the joints between the casting anchor ear and the circular transition plate, and the circular transition plate and the suction anchor barrel, the welding order is to weld the inside first, weld the outside after welding and cleaning the root, weld the straight edge welds symmetrically in pairs, weld the four-corner fillet welds obliquely symmetrically in pairs, and weld the straight edge welds and the four-corner fillet welds alternately to make the weld layer synchronous and uniform.

[0015] Furthermore, when welding the connection plate and the reinforcing plate joint, and the connection plate and the long boss joint of the casting anchor ear, the welding sequence is to first weld the side with the larger groove, and then weld the other side after welding and cleaning.

[0016] The welding structure and welding method for connecting the anchor chain on the mooring suction anchor of the present invention have the following advantages: A first square hole and a second square hole are opened on the side wall of the suction anchor cylinder section, and the invention also includes a circular transition plate and a reinforcement plate. The circular transition plate is welded in the first square hole, and the reinforcement plate is welded in the second square hole. A casting anchor ear is welded in the circular transition plate. The casting anchor ear and the reinforcement plate are connected by a connecting plate. The auxiliary lifting of the suction anchor and the connection with the external mooring anchor head chain are realized through the casting anchor ear. The welding structure is simple in design, the assembly welding is convenient and quick, the stress distribution is uniform, and the structural strength and stability of the suction anchor are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a welding structure for connecting an anchor chain on a mooring suction anchor of the present invention; Figure 2 It is a structural schematic diagram of a welding structure connected with an anchor chain according to the present invention; Figure 3 It is a schematic cross-sectional structure diagram of a welding structure of an anchor chain connection of the present invention; Figure 4 It is a structural schematic diagram of the suction anchor barrel section of the present invention; Figure 5 It is a schematic diagram of the structure of the anchor ear of the casting of the present invention; Figure 6 The present invention is a flow chart of a welding method for connecting anchor chains on a mooring suction anchor.

[0018] Description of the markings in the figure: 1. Suction anchor cylinder section; 11. First square hole; 12. Second square hole; 2. Round transition plate; 3. Casting anchor ear; 31. Anchor ear plate; 32. Handle; 33. Long strip boss; 4. Reinforcement plate; 5. Connecting plate; 6. Anchor head chain; 7. First suction anchor cylinder body; 8. Second suction anchor cylinder body. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0020] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0021] Please refer to the attached Figure 1 To Attachment Figure 6 The invention describes a welding structure and a welding method for connecting an anchor chain on a mooring suction anchor.

[0022] At present, there are many types of anchor chain connection structures on existing mooring suction anchors, and the welding methods are different, but there are some limitations, such as mismatched material selection, unreasonable layout, complex and redundant structure, difficult welding, uneven stress distribution, etc., which cannot well meet the mooring load requirements of marine floating facilities and affect the safety and reliability of mooring. Therefore, it is urgent to design a welding structure and welding method for anchor chain connection on mooring suction anchor to solve the above-mentioned problems.

[0023] like Figure 1 and Figure 2As shown, a welding structure for connecting an anchor chain on a mooring suction anchor in the present invention comprises a suction anchor barrel section 1, which is welded between a first suction anchor barrel body 7 and a second suction anchor barrel body 8, and a first square hole 11 and a second square hole 12 are provided on a side wall of the suction anchor barrel section 1. The structure also comprises a circular transition plate 2 and a reinforcing plate 4, wherein the circular transition plate 2 is welded in the first square hole 11, and the reinforcing plate 4 is welded in the second square hole 12. A casting anchor ear 3 is welded in the circular transition plate 2, and the casting anchor ear 3 is connected to the reinforcing plate 4 by a connecting plate 5. The casting anchor ear 3 is used to realize auxiliary lifting of the suction anchor and connection with an external mooring anchor head chain 6.

[0024] A first square hole 11 and a second square hole 12 are opened on the side wall of the suction anchor cylinder section 1, and the invention also includes a circular transition plate 2 and a reinforcement plate 4. The circular transition plate 2 is welded in the first square hole 11, and the reinforcement plate 4 is welded in the second square hole 12. A casting anchor ear 3 is welded in the circular transition plate 2, and the casting anchor ear 3 is connected to the reinforcement plate 4 by a connecting plate 5. The auxiliary lifting of the suction anchor and the connection with the external mooring anchor head chain 6 are realized through the casting anchor ear 3. The welding structure is simple in design, the assembly welding is convenient and quick, the stress distribution is uniform, and the structural strength and stability of the suction anchor are improved.

[0025] Further, if Figures 1 to 5 As shown, the casting anchor lug 3 includes an anchor lug plate 31, a handle 32 and a long boss 33. The long boss 33 is arranged on a side of the anchor lug plate 31 close to the reinforcing plate 4, and the handle 32 is arranged on a side of the anchor lug plate 31 away from the reinforcing plate 4. The long boss 33 is connected to one end of the connecting plate 5, and the handle 32 is connected to the sling, and the handle 32 is connected to the external mooring anchor chain 6. In this embodiment, the outer edge grooves around the anchor lug plate 31 are prepared by machining, and the grooves on the first square hole 11, the second square hole 12, the round transition plate 2, the reinforcing plate 4 and the connecting plate 5 are prepared by thermal cutting.

[0026] Further, if Figures 1 to 5 As shown, according to the fatigue load requirements, through strength calculation and analysis, the cast anchor ear 3 is made of high-strength cast steel, and the suction anchor barrel section 1, the round transition plate 2, the reinforcement plate 4 and the connecting plate 5 are made of high-strength marine engineering steel. The four corners of the first square hole 11, the four corners of the second square hole 12, the four corners of the inner and outer sides of the round transition plate 2, the four corners of the anchor ear plate 31, and the four corners of the reinforcement plate 4 are all rounded to reduce the stress concentration generated when the welded structures are welded together. The outer edges of the round transition plate 2 and the reinforcement plate 4 are thinned and transitioned so that the thickness of the outer edges is the same as that of the suction anchor barrel section 1. The reinforcement plate 4, the round transition plate 2 and the anchor ear plate 31 are all arc-shaped structures, and the curvature is the same as that of the suction anchor barrel section 1.

[0027] The present invention also discloses a welding method for connecting an anchor chain on a mooring suction anchor. Figure 6As shown, the following steps are included: S1. According to the orientation and size of the circular transition plate 2 and the reinforcement plate 4 on the drawing, the suction anchor cylinder section 1 is marked with marking lines of the first square hole 11 and the second square hole 12 on the front and rear sides, and hot cutting is performed to open the holes and process the grooves; When the first square hole 11 and the second square hole 12 are thermally cut, the straight edge section is flame cut by a semi-automatic magnetic cutting machine, the four corner rounded areas are manually flame cut, and the groove preparation is processed in the form of an X-shaped joint with a larger inside and a smaller outside, and the single-side groove angle is 20° to 25°.

[0028] S2, marking and hot cutting the circular transition plate 2, the reinforcing plate 4 and the connecting plate 5, and processing the groove; When the circular transition plate 2 and the reinforcement plate 4 are thermally cut, the straight edge section is flame cut by a semi-automatic magnetic cutting machine, the four corner rounded areas are manually flame cut, and the groove is prepared in the form of an X-shaped joint with a larger inside and a smaller outside, and the single-side groove angle is 20°~25°. The groove preparation on the inner side of the circular transition plate 2 needs to match the groove form of the anchor ear 3 of the casting to be welded, and the grooves at both ends of the connecting plate 5 are flame cut by a semi-automatic magnetic cutting machine, and the groove is prepared in the form of an asymmetric K-shaped joint, and the groove angle is 30°~45°.

[0029] S3, aligning the reinforcing plate 4 into the second square hole 12 and performing joint welding; The positioning welding point is fixed at the root of the groove, the straight side welds are welded by SAW mechanical welding, and the four corner fillet welds are welded by FCAW manual welding.

[0030] The gap between the joints is 0-1mm, the blunt edge is 3-4mm, and the misalignment is ≤4mm. During welding, the welding process shall be carried out in accordance with the welding process regulations, and matching welding materials shall be selected. The welding heat input shall be strictly controlled during the welding process. The preheating temperature shall be ≥150℃, and the interlayer temperature shall be ≤210℃. The welding sequence is to weld the inside first, weld the root and then weld the outside. The straight edge welds shall be welded symmetrically in pairs, and the four-corner fillet welds shall be welded obliquely and symmetrically in pairs. The straight edge welds and the four-corner fillet welds shall be welded alternately to ensure the synchronization and uniformity of the weld layer, avoid serious welding deformation, and reduce stress concentration.

[0031] S4. According to the position of the connecting plate 5 on the reinforcing plate 4 on the drawing, mark the inner side of the reinforcing plate 4 and mark the group identification line connected to the connecting plate 5; S5, assembling one end of the connecting plate 5 close to the reinforcing plate 4 to the reinforcing plate 4 in the suction anchor cylinder section 1 and welding the joint; The positioning welding point is fixed at the root of the groove, the joint assembly gap is 0-1mm, the blunt edge is 1-2mm, and the misalignment is ≤2mm; at the same time, the unassembled end of the connecting plate 5 away from the reinforcing plate 4 needs to be temporarily fixed; FCAW manual welding is adopted in accordance with the welding process regulations, and matching welding materials are selected. The welding sequence is to weld the larger side of the groove first, and then weld the other side after welding and cleaning the root. The preheating temperature is ≥150℃, and the interlayer temperature is ≤210℃. During the welding process, wind and rain protection measures should be taken, and the welding heat input and welding deformation should be strictly controlled.

[0032] S6. Assemble the casting anchor ears 3 into the circular transition plate 2, i.e., the central hollow part of the circular transition plate 2; fix the positioning welding point at the root of the groove, the joint assembly gap is 0-1mm, the blunt edge is 3-4mm, and the misalignment of the joint is ≤4mm; S7, assemble the circular transition plate 2 and the casting anchor ear 3 into the first square hole 11 as a whole, and assemble the end of the connecting plate 5 close to the casting anchor ear 3 with the long strip boss 33 on the casting anchor ear 3; When the integral components of the circular transition plate 2 and the casting anchor ear 3 are assembled to the first square hole 11 on the suction anchor cylinder section 1, the position needs to be finely adjusted so that the handle 32 of the casting anchor ear 3 is coaxial with the central axis of the suction anchor cylinder body, and then the welding points are fixed. The positioning welding point is located at the root of the groove. The joint assembly gap is 0-1mm, the blunt edge is 3-4mm, and the misalignment amount is ≤4mm. The connection plate 5 and the long strip boss 33 are positioned at the root of the groove. The joint assembly gap is 0-1mm, the blunt edge is 1-2mm, and the misalignment amount is ≤2mm. After the assembly is completed, the temporary fixation of the previous connection plate 5 is removed.

[0033] S8, sequentially weld the joints between the casting anchor ear 3 and the round-shaped transition plate 2, the joints between the round-shaped transition plate 2 and the suction anchor cylinder section 1, and the joints between the connecting plate 5 and the long strip boss 33.

[0034] When welding the joints of the casting anchor ear 3 and the circular transition plate 2, and the circular transition plate 2 and the suction anchor cylinder section 1, the welding shall be carried out strictly in accordance with the welding process regulations. The straight edge welds shall be welded by SAW mechanical welding, and the four-corner fillet welds shall be welded by FCAW manual welding. Matching welding materials shall be used respectively. The welding heat input shall be strictly controlled during the welding process. The preheating temperature shall be ≥150℃, and the interlayer temperature shall be ≤210℃. The welding sequence shall be to weld the inside first, weld the outside after welding and cleaning the root, weld the straight edge welds symmetrically in pairs, and weld the four-corner fillet welds obliquely symmetrically in pairs. The straight edge welds and the four-corner fillet welds shall be welded alternately to ensure the synchronization and uniformity of the weld layer, avoid serious welding deformation, and reduce stress concentration.

[0035] When the connection plate 5 and the long boss 33 are welded, FCAW manual welding is adopted in accordance with the welding process regulations, and matching welding materials are selected. The welding sequence is to weld the larger side of the groove first, and then weld the other side after welding and cleaning. The preheating temperature is ≥150℃, and the interlayer temperature is ≤210℃. During the welding process, wind and rain protection is done well, and the welding heat input and welding deformation are strictly controlled.

[0036] After the weld appearance and size are checked to be in compliance with the requirements, the assembly welding of the welded structure connected to the anchor chain on the mooring suction anchor is completed.

[0037] The welding structure of the anchor chain connection on a mooring suction anchor in the present invention has a reasonable structural design, reliable material selection and matching, uniform stress distribution, convenient and quick assembly and welding, the cast anchor ear 3 has good wear resistance, and the straight-shaped connecting plate 5 has little disturbance to the soil when the suction anchor cylinder is buried, which can effectively ensure the buried posture of the suction anchor. The structural strength and stability of the suction anchor are improved, the assembly and welding quality is guaranteed, the mooring anchor point has good fatigue load resistance, can withstand large vertical and horizontal mooring anchor chain tension for a long time, and can effectively ensure the mooring safety and reliability of marine floating facilities.

[0038] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A welding structure for connecting anchor chains on a mooring suction anchor, characterized in that: It includes a suction anchor barrel section, which is welded between a first suction anchor barrel body and a second suction anchor barrel body, and a first square hole and a second square hole are opened on the side wall of the suction anchor barrel section. It also includes a circular transition plate and a reinforcement plate, the circular transition plate is welded in the first square hole, the reinforcement plate is welded in the second square hole, a casting anchor ear is welded in the circular transition plate, the casting anchor ear and the reinforcement plate are connected by a connecting plate, and the auxiliary lifting of the suction anchor and the connection with the external mooring anchor head chain are realized through the casting anchor ear.

2. The welding structure for connecting the anchor chain on the mooring suction anchor according to claim 1 is characterized in that: The casting anchor ear comprises an anchor ear plate, a handle and a long boss. The long boss is arranged on a side of the anchor ear plate close to the reinforcing plate, and a handle is arranged on a side of the anchor ear plate away from the reinforcing plate. The long boss is connected to one end of the connecting plate, and the handle is connected to the sling.

3. The welding structure for connecting anchor chains on a mooring suction anchor according to claim 1, characterized in that: The reinforcing plate, the circular transition plate and the anchor ear plate are all arc-shaped structures, and the curvature is the same as the curvature of the suction anchor cylinder section.

4. A welding method for connecting anchor chains on a mooring suction anchor, characterized in that: The steps include: S1. Lofting and marking are performed on the suction anchor cylinder section, marking the marking lines of the first square hole and the second square hole on the front and rear sides, and hot cutting is performed to open the holes and process the grooves; S2. Loft and mark the circular transition plate, reinforcement plate and connection plate, and perform thermal cutting to cut the material and process the groove; S3, aligning the reinforcing plate assembly into the second square hole and performing joint welding; S4. Mark out the inner side of the reinforcement plate to mark the group identification line connected to the connection plate; S5. Assemble one end of the connecting plate close to the reinforcing plate to the reinforcing plate in the suction anchor cylinder section and weld the joint; S6. Assemble the casting anchor ears into the circular transition plate; S7, assembling the circular transition plate and the casting anchor ear as a whole into the first square hole, and assembling one end of the connecting plate close to the casting anchor ear with the long strip boss on the casting anchor ear; S8. Weld the joints between the anchor ear of the casting and the round-shaped transition plate, the joints between the round-shaped transition plate and the suction anchor cylinder, and the joints between the connecting plate and the long boss in sequence.

5. The welding method for connecting anchor chains on a mooring suction anchor according to claim 4, characterized in that: The first square hole and the second square hole are opened by thermal cutting, the circular transition plate and the reinforcement plate are cut by thermal cutting, the straight edge sections are flame cut by a semi-automatic magnetic cutting machine, the four corner rounded areas are flame cut manually, the grooves are prepared in the form of an X-shaped joint with a larger inside and a smaller outside, the grooves at both ends of the connecting plate are flame cut by a semi-automatic magnetic cutting machine, and the grooves are prepared in the form of an asymmetric K-shaped joint.

6. The welding method for connecting anchor chains on a mooring suction anchor according to claim 4, characterized in that: In step S3, the tack weld is fixed at the root of the groove, the straight side weld is welded by SAW mechanical welding, and the four corner fillet welds are welded by FCAW manual welding.

7. The welding method for connecting anchor chains on a mooring suction anchor according to claim 4, characterized in that: In step S5, the positioning welding point is fixed at the root of the groove, and the unassembled end of the connecting plate away from the reinforcing plate needs to be temporarily supported and fixed, and the weld is manually welded by FCAW.

8. The welding method for connecting anchor chains on a mooring suction anchor according to claim 4, characterized in that: In step S7, when the integral component assembly of the roundabout transition plate and the casting anchor ear is aligned with the first square hole, the orientation needs to be finely adjusted so that the handle of the casting anchor ear is coaxial with the central axis of the suction anchor cylinder, and then the welding points are fixed, the positioning welding points are fixed at the root of the groove, and the connection plate and the long strip boss are fixed at the root of the groove.

9. The welding method for connecting anchor chains on a mooring suction anchor according to claim 4, characterized in that: When welding the joints between the reinforcement plate and the suction anchor barrel, the joints between the casting anchor ear and the round-shaped transition plate, and the round-shaped transition plate and the suction anchor barrel, the welding order is to weld the inside first, weld the outside after welding and cleaning the root, weld the straight edge welds symmetrically in pairs, and weld the four-corner fillet welds obliquely symmetrically in pairs. The straight edge welds and the four-corner fillet welds should be welded alternately to make the weld layer synchronous and uniform.

10. The welding method for connecting anchor chains on a mooring suction anchor according to claim 4, characterized in that: When welding the joint between the connecting plate and the reinforcing plate, and the long boss joint between the connecting plate and the anchor ear of the casting, the welding sequence is to weld the side with the larger groove first, and then weld the other side after welding and cleaning the root.

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