CN116765657A - Welding method of thin plates in living area of crude oil transfer barge - Google Patents

Abstract

The invention discloses a living area sheet welding method for converting crude oil into barges, which comprises the following steps: forming a platform bottom plate through jointed board welding; welding a triangular connecting plate at the end part of the flat-bulb steel plate to form a bulkhead connecting component; setting a region to be welded on a platform base; sequentially welding a plurality of longitudinally arranged flat-bulb steel metal plates on the platform bottom plate by adopting a split welding method; sequentially welding a plurality of transverse reinforcing rib plates on the platform bottom plate at intervals; welding bulkhead connectors on the platform bottom plate, and welding butt joints between the bulkhead connectors and the flat-bulb steel plate pieces; and respectively welding the stringer members and the cross beam members on the platform bottom plate to form a platform base. By adopting the welding method, the welding efficiency of the living area sheet is optimized, the concentration of welding stress is avoided, and the problem of larger subsequent assembly gaps is solved by adjusting the welding sequence and the welding seam length between the platform bottom plate and the flat-bulb steel plate, the bulkhead connecting component, the longitudinal truss component and the cross beam component.

Description

Welding method of thin plates in living area of crude oil transfer barge

Technical field

The invention relates to the field of crude oil transfer barge manufacturing, and in particular to a method for welding thin plates in the living area of the crude oil transfer barge.

Background technique

Traditional crude oil transfer usually uses a combination of "FPSO (floating production and storage vessel) + shuttle tanker". Considering the complex sea conditions under the combined action of wind, wave and current near the FPSO operating area, a shuttle tanker with good dynamic positioning performance can better handle the transfer. Approach FPSO to complete the transfer of crude oil. However, the current international oil price continues to remain at a low level. The "FPSO + shuttle tanker" transshipment mode transports a small amount of crude oil at a time and the transportation cost is high. Especially in the case of long-distance transportation, this shortcoming is particularly significant and greatly reduces the demand for oil. Profit margins for crude oil extraction companies.

Compared with shuttle tankers, VLCC (very large tanker) has a larger single transportation volume, which can greatly reduce the cost of transporting crude oil at sea. However, the traditional VLCC ship type has poor dynamic positioning capabilities. If crude oil is transported close to an FPSO, it will need the help of complex multi-point moorings and auxiliary ships to achieve a relatively stable state, and has relatively high requirements for the seabed conditions in the operating sea area. Therefore, in order to cater to the above market needs and build a transfer bridge between VLCC and FPSO, CTV (crude oil transfer vessel) came into being.

The superstructure of a crude oil transfer barge is usually equipped with various crew living area cabins. Since the living area only needs to meet the daily use of the crew and does not need to be equipped with larger ship machinery and equipment, based on the economic considerations of construction, crude oil transfer barges The living area is made of thin steel plates welded to the frame. Among them, the platform base as the floor slab in the living area has a large surface area and many structural reinforcements such as horizontal and vertical beams. It is difficult to ensure the continuity of welding and is prone to welding stress concentration, resulting in low processing efficiency and easy deformation in the manufacturing process. If deformation occurs, a large assembly gap will occur, which will affect the subsequent assembly of the entire living area segment.

Contents of the invention

The purpose of the present invention is to propose a thin plate welding method for the living area of a crude oil transfer barge to solve one or more technical problems existing in the above background technology.

To achieve this goal, the present invention adopts the following technical solutions:

A method for welding thin plates in living areas of crude oil transfer barges. The method includes the following steps:

S100: The platform bottom plate is formed by panel welding;

S200: Weld the triangular connecting plate to the end of the bulbous flat steel sheet to form the bulkhead connecting member;

S300: Set on the platform base a plurality of first areas to be welded with the bulbous flat steel sheet, a plurality of second areas to be welded with the transverse stiffeners, and a third area to be welded with the bulkhead connecting members. area, a plurality of fourth to-be-welded areas welded to the cross member members and a fifth to-be-welded area welded to the longitudinal girder members;

S400: Use the split welding method to sequentially weld multiple longitudinally arranged spherical flat steel sheet parts in the first area to be welded on the platform bottom plate;

S500: Weld multiple transverse stiffening plates in the second area to be welded on the platform bottom plate in sequence from the middle to the front and rear sides;

S600: Weld the bulkhead connector in the third area to be welded on the platform bottom plate, and weld the butt joint between the bulkhead connector and the bulbous steel sheet;

S700: The fourth and fifth areas to be welded are welded to the fourth and fifth areas to be welded on the platform bottom plate respectively to form the platform base by welding the longitudinal girders and beam members.

Preferably, step S100 specifically includes the following steps:

S101: Weld together and weld multiple rectangular steel plates and multiple rectangular steel plates and rounded steel plates respectively to form the first bottom plate and the second bottom plate;

S102: Place the first bottom plate and the second bottom plate on the tire frame, stagger the welds between the steel plates on the first bottom plate and the second bottom plate, and fix them through the angle steel array on the tire frame;

S103: Weld the butt joint between the first bottom plate and the second bottom plate to form a platform bottom plate.

Preferably, step S400 specifically includes the following steps:

S410: First weld the spherical flat steel sheet located in the first area to be welded in the middle of the platform bottom plate;

S420: Weld the ball flat steel sheet parts alternately from the first areas to be welded on both sides of the middle of the platform bottom plate;

S430: Weld the spherical flat steel sheet parts to the remaining unwelded first areas to be welded from the middle to both sides of the platform bottom plate.

Preferably, step S410 specifically includes the following steps:

S411: Divide the first area to be welded between the spherical flat steel sheet and the platform bottom plate into four butt welds of equal length;

S412: Simultaneously weld the two butt welds located in the middle of the connection between the spherical flat steel sheet and the platform bottom plate. The moving direction of the welding gun is from the middle to the outside;

S413: After the two butt welds formed by welding in step S302 have cooled, weld the other two butt welds at the same time. The moving direction of the welding gun moves from the middle of the platform bottom plate to the outside until the bulbous flat steel sheet and the platform base are connected. fixed.

Preferably, step S600 specifically includes the following steps:

S601: Position the bulkhead connecting member on the third area to be welded, so that the bottom of the bulkhead connecting member fits the platform bottom plate and the end of the bulkhead connecting member away from the triangular connecting plate fits the spherical flat steel sheet;

S602: Weld the butt joint between the bulkhead connecting member and the platform bottom plate;

S603: Weld the vertical weld between the bulkhead connecting member and the bulbous flat steel sheet.

Preferably, step S700 specifically includes the following steps:

S710: Position the crossbeam members to both sides of the longitudinal girders, fit the ends of the crossbeam members to the longitudinal girders, and weld the butt joints between the upper edge of the crossbeam members and the upper edge of the longitudinal girders. ;

S720: Use jump welding method to weld the beam components on the fourth welding area;

S730: Use the alternating welding method to weld the longitudinal girders on the fifth welding area;

S740: Welding the vertical seams between longitudinal girders and beam members.

Preferably, step S720 specifically includes the following steps:

S721: Move the welded beam members and longitudinal girders to the bottom plate of the platform;

S722: Divide the fourth area to be welded between the cross beam member and the platform bottom plate into five butt joints of equal length, which are distributed sequentially from one end of the cross beam member close to the longitudinal girder to the other end. They are the third cross beam butt joint, the third cross beam butt joint, and the third cross beam joint. The first beam butt joint, the fourth beam butt joint, the second beam butt joint and the fifth beam butt joint;

S723: Weld the butt joints of the first beam, the second beam, the third beam, the fourth beam and the fifth beam in sequence. The moving direction of the welding gun is from the beam member. One end close to the longitudinal girder to the other end.

Preferably, step S730 specifically includes the following steps:

S731: Divide the fifth to-be-welded area between the longitudinal girders and the platform floor into six butt joints of equal length from the midpoint to the rear end, which are the fourth longitudinal girder butt joint, the first longitudinal girder butt joint, and the third longitudinal girder butt joint. The butt joints of the fifth longitudinal girder, the butt joints of the second longitudinal girder, the butt joints of the sixth longitudinal girder and the butt joints of the third longitudinal girder;

S732: Carry out the butt joints of the first longitudinal girder, the butt joints of the second longitudinal girder, the butt joints of the third longitudinal girder, the butt joints of the fourth longitudinal girder, the butt joints of the fifth longitudinal girder and the butt joints of the sixth longitudinal girder in sequence. When seam welding is performed, the moving direction of the welding gun is from the middle to the rear end of the longitudinal girder member;

S733: Repeat steps S731 and S732 to weld the butt joint from the midpoint to the front end of the fifth area to be welded between the longitudinal girders and the platform bottom plate.

The beneficial effects of the present invention are: using the welding method of the present invention, by adjusting the welding sequence and welding length between the platform bottom plate and spherical flat steel sheet parts, bulkhead connecting members, longitudinal girders members and beam members, the welding seam length is optimized. The welding efficiency of the thin plates in the living area avoids the concentration of welding stress and solves the problem of large gaps in subsequent assembly. The platform bottom plate is formed by panel welding, which reduces the local deformation of the platform bottom plate during transportation and welding. The spherical flat steel sheet parts are welded using the split welding method to avoid thermal expansion deformation of the spherical flat steel sheet parts. , and also avoids the deformation of the platform bottom plate caused by welding stress concentration.

Description of drawings

The accompanying drawings further illustrate the present invention, but the contents in the accompanying drawings do not constitute any limitation on the present invention.

Figure 1 is a schematic flow chart of a welding method according to one embodiment of the present invention;

Figure 2 is a schematic diagram of the overall structure of the platform base according to one embodiment of the present invention;

Figure 3 is a welding sequence diagram of the spherical flat steel sheet piece and the platform bottom plate in the welding method according to one embodiment of the present invention;

Figure 4 is a welding sequence diagram of the bulkhead connecting member and the transverse stiffening plate and the platform bottom plate in the welding method according to one embodiment of the present invention;

Figure 5 is a welding sequence diagram of the beam member and the platform bottom plate in the welding method according to one embodiment of the present invention;

Figure 6 is a welding sequence diagram of the longitudinal girders and the platform bottom plate in the welding method according to one embodiment of the present invention.

Among them: platform bottom plate 1, triangular connecting plate 21, bulbous flat steel sheet 22, bulkhead connecting member 2, transverse stiffening plate 3, longitudinal girder member 4, and transverse beam member 5.

Detailed ways

The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation modes.

A method of welding thin plates in the living area of a crude oil transfer barge according to this embodiment, with reference to Figures 1, 2 and 4, the method includes the following steps:

S100: The platform bottom plate 1 is formed through welding of panels;

S200: Weld the triangular connecting plate 21 to the end of the bulbous flat steel sheet 22 to form the bulkhead connecting member 2; the bulkhead connecting member is used to connect to the bulkhead during subsequent segmental manufacturing;

S300: Set on the platform base a plurality of first areas to be welded to the spherical flat steel sheet 22, a plurality of second areas to be welded to the transverse stiffening plates 3, and a third area to be welded to the bulkhead connecting member 2. Three areas to be welded, a plurality of fourth areas to be welded to the cross member 5 and a fifth area to be welded to the longitudinal girders 4;

S400: Use the split welding method to sequentially weld multiple longitudinally arranged spherical flat steel sheet parts 22 in the first to-be-welded area on the platform bottom plate 1;

S500: Weld multiple transverse stiffening plates 3 in the second to-be-welded area on the platform bottom plate 1 along the weld seams 7-1 to 13-3 from the middle to the front and rear sides in sequence.

S600: Weld the bulkhead connector in the third area to be welded on the platform bottom plate 1, and weld the butt joint between the bulkhead connector and the bulbous steel sheet 22;

S700: Weld the longitudinal girders 4 and the crossbeam members 5 respectively in the fourth and fifth areas to be welded on the platform bottom plate 1 to form a platform base.

The platform bottom plate 1 is formed by panel welding, which reduces the local deformation of the platform bottom plate 1 during transportation and welding. The spherical flat steel sheet 22 is welded using the split welding method to avoid the spherical flat steel sheet 22. The thermal expansion deformation of 22 also avoids the deformation of the platform bottom plate 1 caused by the concentration of welding stress; using the welding method of the present invention, the platform bottom plate 1 and the spherical flat steel sheet 22, the bulkhead connecting member 2, the longitudinal girder member 4 and the cross beam are The welding sequence and weld length between components 5 are adjusted to optimize the welding efficiency of thin plates in the living area, avoid welding stress concentration, and solve the problem of large gaps in subsequent assembly. The welding seams between the triangular connecting plate 21 and the ends of the bulbous flat steel sheet 22 are welding seams BK1 to BK16 respectively.

Preferably, step S100 specifically includes the following steps:

S101: Weld together and weld multiple rectangular steel plates and multiple rectangular steel plates and rounded steel plates respectively to form the first bottom plate and the second bottom plate;

S102: Place the first bottom plate and the second bottom plate on the tire frame, stagger the welds between the steel plates on the first bottom plate and the second bottom plate, and fix them through the angle steel array on the tire frame;

S103: Weld the butt joint between the first bottom plate and the second bottom plate to form the platform bottom plate 1.

Therefore, by joining together multiple rectangular steel plates and multiple rectangular steel plates and rounded steel plates to form the first bottom plate and the second bottom plate, and then splicing the first bottom plate and the second bottom plate to form the platform bottom plate 1, multiple pieces with smaller surface areas are used. The steel plates are spliced to form a platform bottom plate 1 with a larger surface area. This method not only facilitates the transportation of the platform bottom plate 1, but also reduces local deformation of the platform bottom plate 1 during transportation and welding.

Preferably, referring to Figure 3, step S400 specifically includes the following steps:

S410: First weld the spherical flat steel sheet piece 22 located at the first area to be welded in the middle of the platform bottom plate 1 along the welds 1-1 to 1-2 and the welds 2-1 to 2-2;

S420: Weld sequentially from the first areas to be welded on both sides of the middle part of the platform bottom plate 1 to weld the spherical flat steel sheet parts 22 to the welds 3-1 to 3-2;

S430: Sequentially weld the spherical flat steel sheet parts 22 to the remaining unwelded first areas to be welded from the middle to both sides of the platform bottom plate 1, and sequentially weld the spherical flat steel sheet parts 22 to weld seams 4-1 to 4-. 2. Welding seam 5-1 ~ welding seam 5-2 and welding seam 6-1 ~ welding seam 4-1.

Therefore, by first welding the spherical flat steel sheet pieces 22 alternately from the middle to the outside of the platform bottom plate 1, the platform bottom plate 1 is prevented from being easily deformed due to local overheating during the welding process, the welding heat affected zone is reduced, and the cooling waiting time of the welding is saved. Improved welding efficiency.

Further, step S410 specifically includes the following steps:

S411: Divide the first area to be welded between the bulbous flat steel sheet 22 and the platform bottom plate 1 into four butt welds of equal length;

S412: Simultaneously weld the two butt welds located in the middle of the connection between the bulbous flat steel sheet 22 and the platform bottom plate 1, and the moving direction of the welding gun is from the middle to the outside;

S413: After the two butt welds formed by welding in step S302 are cooled, weld the other two butt welds at the same time. The moving direction of the welding gun moves from the middle of the platform bottom plate 1 to the outside until the bulbous flat steel sheet 22 and The platform base is fixed.

The spherical flat steel sheet piece 22 is welded using the split welding method, which avoids the thermal expansion deformation of the spherical flat steel sheet piece 22 and avoids the deformation of the platform bottom plate 1 caused by the concentration of welding stress.

Preferably, step S600 specifically includes the following steps:

S601: Position the bulkhead connecting member 2 on the third area to be welded, so that the bottom of the bulkhead connecting member 2 fits the platform bottom plate 1 and the end of the bulkhead connecting member away from the triangular connecting plate 21 is connected to the bulbous flat steel sheet. 22 fit;

S602: Weld the butt joint between the bulkhead connecting member 2 and the platform bottom plate 1;

S603: Weld the vertical weld between the bulkhead connecting member 2 and the bulbous flat steel sheet 22.

Therefore, by first welding the bottom of the bulkhead connecting member 2, and then welding the vertical seam between the bulkhead connecting member 2 and the bulbous steel sheet 22, local overheating of the bulkhead connecting member 2 is avoided, and the cost is saved. The cooling waiting time of welding improves the efficiency of welding.

Preferably, step S700 specifically includes the following steps:

S710: Position the crossbeam member 5 to both sides of the longitudinal girder member 4, and fit the end of the crossbeam member 5 to the longitudinal girder member 4. Welding of butt joints;

S720: Use the jump welding method to weld the beam member 5 on the fourth welding area;

S730: Use the alternating welding method to weld the longitudinal girder member 4 on the fifth welding area;

S740: Weld the vertical seams ① to ⑧ between the longitudinal girders 4 and the cross beam members 5.

First, weld the butt joints between the upper edge of the end of the crossbeam member 5 and the upper edge of the longitudinal girder member 4 to facilitate the positioning of the installation positions of the crossbeam member 5 and the longitudinal girder member 4, and then use the jump welding method and the The welding between the cross beam member 5 and the platform bottom plate 1 is alternately realized to reduce the deformation caused by welding.

Further, referring to Figure 5, step S720 specifically includes the following steps:

S721: Move the cross beam member 5 and longitudinal girder member 4 that are welded together to the platform bottom plate 1;

S722: Divide the fourth to-be-welded area between the cross-beam member 5 and the platform bottom plate 1 into five butt joints of equal length, which are distributed sequentially from one end of the cross-beam member 5 close to the longitudinal girder to the other end, respectively for the third cross-beam butt joints. Seam BM1-3, first beam butt joint BM1-1, fourth beam butt joint BM1-4, second beam butt joint BM1-2 and fifth beam butt joint BM1-6;

S723: Weld the butt joints of the first beam, the second beam, the third beam, the fourth beam and the fifth beam in sequence. The moving direction of the welding gun is from the beam member. 5 from one end close to the longitudinal girder to the other end;

S724: Repeat the above steps to complete the welding of beam butt joints BM2-1 to beam butt joints BM8-5.

Since the length of the butt joints between the cross beam member 5 and the platform bottom plate 1 is relatively long, this embodiment uses a jump welding method to sequentially seal the first cross beam butt joints, the second cross beam butt joints, the third cross beam butt joints, and the third cross beam butt joints. The welding of the fourth beam butt joint and the fifth beam butt joint can disperse the heat of the butt weld of the cross beam member 5 and reduce the deformation caused by the welding.

Further, referring to Figure 6, step S730 specifically includes the following steps:

S731: Divide the fifth to-be-welded area between the longitudinal girder member 4 and the platform bottom plate 1 into six butt joints of equal length from the midpoint to the rear end, which are the fourth longitudinal girder butt joints GR1-4 and the first longitudinal girder. Butt joint GR1-1, fifth longitudinal girder butt joint GR1-5, second longitudinal girder butt joint GR1-2, sixth longitudinal girder butt joint GR1-6 and third longitudinal girder butt joint GR1-3 ;

S732: Carry out the first longitudinal girder butt joint GR1-1, the second longitudinal girder butt joint GR1-2, the third longitudinal girder butt joint GR1-3, the fourth longitudinal girder butt joint GR1-4, and the fifth longitudinal girder butt joint GR1-4 in sequence. When welding the longitudinal girder butt joint GR1-5 and the sixth longitudinal girder butt joint GR1-6, the moving direction of the welding gun is from the middle to the rear end of the longitudinal girder member 4;

S733: Repeat steps S731 and S732 to weld the longitudinal girder butt joints GR2-1 to the longitudinal girder butt joints GR2-6 in the fifth to-be-welded area between the longitudinal girder member 4 and the platform bottom plate 1 from the midpoint to the front end. .

Similarly, since the length of the butt joints between the longitudinal girders 4 and the platform bottom plate 1 is relatively long, the fifth area to be welded is divided into six butt joints of equal length from the midpoint to the rear end and the rear end. In this embodiment, The alternating welding method is used to sequentially weld the butt joints of the first longitudinal girder, the butt joints of the second longitudinal girder, the butt joints of the third longitudinal girders, the butt joints of the fourth longitudinal girders, the butt joints of the fifth longitudinal girders and the sixth longitudinal girders. Welding the joints can disperse the heat of the butt welds of the longitudinal girders 4 and further reduce the deformation caused by welding.

The technical principles of the present invention are described above in conjunction with specific embodiments. These descriptions are only for explaining the principles of the present invention and should not be construed as limiting the scope of the present invention in any way. Based on the explanations here, those skilled in the art can think of other specific embodiments of the present invention without any creative effort, and these methods will all fall within the protection scope of the present invention.

Claims (8)

1. A method for welding a living area sheet of a crude oil transfer barge, which is characterized by comprising the following steps:

s100: forming a platform bottom plate through jointed board welding;

s200: welding a triangular connecting plate at the end part of the flat-bulb steel plate to form a bulkhead connecting component;

s300: setting a plurality of first areas to be welded with the flat-bulb steel plate, a plurality of second areas to be welded with the transverse reinforcing rib plates, a third area to be welded with the bulkhead connecting component, a plurality of fourth areas to be welded with the cross beam component and a fifth area to be welded with the stringer component on the platform base;

s400: sequentially welding a plurality of longitudinally arranged flat-bulb steel metal plates in a first area to be welded on a platform bottom plate by adopting a split welding method;

s500: a plurality of transverse reinforcing rib plates are welded at intervals from the middle part to the front side and the rear side of a second to-be-welded area on the platform bottom plate in sequence;

s600: welding a bulkhead connecting piece in a third to-be-welded area on the platform bottom plate, and welding a butt joint between the bulkhead connecting piece and the flat bulb steel plate;

s700: and welding the longitudinal truss members and the cross beam members on the fourth to-be-welded area and the fifth to-be-welded area on the platform bottom plate to form the platform base.

2. The method for welding a living area sheet of a crude oil barge according to claim 1, wherein the step S100 comprises the steps of:

s101: respectively splicing and welding a plurality of rectangular steel plates and a plurality of rectangular steel plates with the round-angle steel plates to form a first bottom plate and a second bottom plate;

s102: placing the first bottom plate and the second bottom plate on the jig frame, staggering welding seams between steel plates on the first bottom plate and the second bottom plate, and fixing the steel plates on the jig frame through an angle steel array on the jig frame;

s103: and welding the butt joint between the first bottom plate and the second bottom plate to form the platform bottom plate.

3. The method for welding a living area sheet of a crude oil barge according to claim 1, wherein the step S400 comprises the steps of:

s410: firstly welding a flat-bulb steel plate piece positioned at a first area to be welded in the middle of a platform bottom plate;

s420: sequentially welding flat-bulb steel metal plates at intervals from first areas to be welded on two opposite sides of the middle part of the platform bottom plate;

s430: and welding flat-bulb steel plate parts on the first to-be-welded areas which are not welded in sequence from the middle part of the platform bottom plate to two sides.

4. A method for welding thin plates in living areas of a crude oil barge according to claim 3, wherein the step S410 specifically comprises the steps of:

s411: dividing a first area to be welded between the flat-bulb steel plate and the platform bottom plate into four butt welding seams with equal length;

s412: simultaneously welding two butt welding seams positioned at the middle part of the connecting part between the flat-bulb steel plate and the platform bottom plate, wherein the moving direction of the welding gun is from the middle part to the outside;

s413: and (3) after the two butt welds formed by welding in the step (S302) are cooled, welding the other two butt welds simultaneously, wherein the moving direction of the welding gun moves outwards from the middle part of the platform bottom plate until the flat-bulb steel plate is fixed with the platform base.

5. The method for welding a living area sheet of a crude oil barge according to claim 1, wherein the step S600 comprises the steps of:

s601: positioning the bulkhead connecting component on a third area to be welded, so that the bottom of the bulkhead connecting component is jointed with the platform bottom plate, and one end, far away from the triangular connecting plate, of the bulkhead connecting component is jointed with the flat-bulb steel plate;

s602: welding butt joints between the bulkhead connecting members and the platform floor;

s603: and welding the vertical welding seam between the bulkhead connecting component and the flat-bulb steel plate.

6. The method for welding a living area sheet of a crude oil barge according to claim 1, wherein the step S700 specifically includes the steps of:

s710: positioning the cross beam members on two sides of the stringer members, attaching the end parts of the cross beam members to the stringer members, and welding butt seams between the upper edges of the end parts of the cross beam members and the upper edges of the stringer members;

s720: welding the cross beam member on the fourth welding area by adopting a skip welding method;

s730: welding the stringer on the fifth welding area by adopting an alternate welding method;

s740: and welding the vertical seam between the stringer member and the cross beam member.

7. The method for welding a living area sheet of a crude oil barge according to claim 6, wherein the step S720 specifically includes the steps of:

s721: moving the welded cross member and stringer member onto the platform floor;

s722: dividing a fourth to-be-welded area between the cross beam member and the platform bottom plate into five butt joints with equal length, wherein the five butt joints are sequentially distributed from one end of the cross beam member, which is close to the longitudinal girder, to the other end of the cross beam member, and the five butt joints are respectively a third cross beam butt joint, a first cross beam butt joint, a fourth cross beam butt joint, a second cross beam butt joint and a fifth cross beam butt joint;

s723: and welding the first beam butt joint, the second beam butt joint, the third beam butt joint, the fourth beam butt joint and the fifth beam butt joint in sequence, wherein the moving direction of the welding gun is from one end, close to the longitudinal girder, of the beam member to the other end.

8. The method for welding a living area sheet of a crude oil barge according to claim 6, wherein the step S730 comprises the steps of:

s731: dividing a fifth to-be-welded area between the stringer component and the platform bottom plate into six opposite joints with equal length from the middle point to the rear end, wherein the six opposite joints are sequentially a fourth stringer opposite joint, a first stringer opposite joint, a fifth stringer opposite joint, a second stringer opposite joint, a sixth stringer opposite joint and a third stringer opposite joint;

s732: welding the first stringer butt seam, the second stringer butt seam, the third stringer butt seam, the fourth stringer butt seam, the fifth stringer butt seam and the sixth stringer butt seam in sequence, wherein the moving direction of the welding gun is from the middle part of the stringer member to the rear end;

s733: steps S731 and S732 are repeated to weld the butt seam from the midpoint to the front end of the fifth area to be welded between the stringer and the deck floor.