Support assembly installing and welding process for large ship

Abstract

The invention relates to the field of support assembly installing and welding. An assembling and welding process for a support assembly used on a ship comprises the steps that firstly, a welding tool clamp is prepared, then parts of the support assembly are prepared, the welding tool clamp is placed on the horizontal plane, all rib plates are placed at the corresponding positions of the welding tool clamp, all the rib plates and inclined plates are subjected to tack welding, and the relative positions of all the parts are fixed; the bracket assembly subjected to tack welding is taken out from the tool clamp, and then tack welding is carried out; welding of the two assemblies is completed, the support bottom plates of the two assemblies are attached to each other and then aligned for point fixing, and a stable welding structure is formed; the handles are assembled through the handle assembling sample plate, tack welding is conducted on each handle and one first rib plate, and it is guaranteed that the installation position of each handle is accurate; welding all welding seams of the bracket assembly by adopting a pulsed power supply; and connecting welding spots of the two assemblies are polished and disassembled, and the reinforcing process plate on the upper support plate is disassembled.

Description

Technical Field

[0001] The invention relates to the field of bracket component assembly welding. Background Art

[0002] Multi-component welding technology is widely used in automotive parts, electronic circuits, photovoltaic modules, ship supports, and large steel structures. Its core is to achieve efficient and precise connection of multiple components. In multi-component welding, the risk of welding defects increases significantly due to factors such as the large number of parts, complex structures, and cumulative thermal deformation.

[0003] During the construction of large ships, bracket assemblies serve as core components that support and secure various equipment and structures onboard. Their manufacturing quality has a crucial impact on the ship's overall performance. However, traditional bracket assembly welding processes have numerous drawbacks, including severe welding deformation, which makes it difficult to ensure the dimensional accuracy of the bracket assemblies; large fluctuations in welding quality, resulting in frequent defects such as pores and cracks; and low production efficiency, which significantly restricts shipbuilding progress and increases manufacturing costs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: how to reduce the many disadvantages of the welding process of bracket components used on large ships.

[0005] The technical solution adopted by the present invention is: a bracket assembly welding process for large ships, which is carried out in the following steps: Step 1, prepare a welding fixture, the welding fixture comprises a fixture base plate, a first support positioning plate (1), a second support positioning plate (2), a third support positioning plate (3), an inclined plate end positioning plate (4) and an inclined plate support positioning plate (5); the fixture base plate is a rectangular plate; the first support positioning plate (1) is two long strips fixed on the front and rear sides of the upper surface of the fixture base plate in a symmetrical structure, each long strip has a first support position, two second support positions and two third support positions, the first support position is a gap perpendicular to the fixture base plate, the second support position is two slopes in a symmetrical structure, and the third support position is two symmetrical slopes; the second support positioning plate (2) is a plurality of concave plates arranged in parallel with the same structure, the concave plates of the second support positioning plates are along the center of the length direction of the fixture base plate. The lines are arranged in a row and fixed on the upper surface of the fixture base plate, and the concave plates of all the second support positioning plates are perpendicular to the fixture base plate and the concave openings are facing upwards, and the concave plates of all the second support positioning plates are parallel to the right side of the fixture base plate; the third support positioning plate (3) is composed of four concave plates, and two concave plates of the third support positioning plates are fixed on the left and right sides of the upper surface of the fixture base plate, and the concave plate of each third support positioning plate is perpendicular to the concave plate of each second support positioning plate; the inclined plate end positioning plates (4) have two pieces and are respectively fixed on the upper right corner and the lower right corner of the upper surface of the fixture base plate, and each inclined plate end positioning plate is a rectangular plate and is parallel to the concave plate of each second support positioning plate; the inclined plate support positioning plates (5) are two rows of L-shaped plates installed on the upper surface of the fixture base plate in a symmetrical structure, and each L-shaped plate of each row of L-shaped plates is parallel to the concave plate of the second support positioning plate; Step 2, prepare the parts of the bracket assembly, the parts of the bracket assembly include a bracket upper plate (6), a bracket inclined plate (7), a bracket bottom plate (8), a first rib plate (9), a second rib plate (10), a third rib plate (11), a handle (12), a fourth rib plate (13), a fifth rib plate (14), a sixth rib plate (15), and a seventh rib plate (16); the bracket upper plate (6) is a rectangular plate; the bracket inclined plate (7) is two hollowed-out rectangular plates + an isosceles trapezoidal plate; the bracket bottom plate (8) is a rectangular plate parallel to the bracket upper plate (6), and the projection of the bracket upper plate (6) in the bracket bottom plate (8) is inside the bracket bottom plate (8); the first rib plate (9) is a hollowed-out rectangular plate An isosceles trapezoidal plate; the second rib plate (10) is an isosceles trapezoidal plate with a hollow upper and lower bottom having the same height as the first rib plate (9) and a height greater than the first rib plate (9); the third rib plate (11) is an isosceles trapezoidal plate with an upper and lower bottom having the same height as the second rib plate (10) and a height greater than the second rib plate (10); the fourth rib plate (13) is two identical isosceles trapezoidal plates; the fifth rib plate (14) is two right-angled trapezoidal plates with the same height as the fourth rib plate (13); the sixth rib plate (15) is two identical quadrilateral plates with parallel upper and lower bottoms; the seventh rib plate (16) is two identical quadrilateral plates with parallel upper and lower bottoms; there are two handles (12), each of which is paired with a sample plate of two handles; Step 3: Place the welding fixture on a horizontal surface, place the first rib plate (9) on the first support position, place the two second rib plates (10) on the two second support positions, place the two third rib plates (11) on the two third support positions, place the two fourth rib plates (12) in the concave plates of the second support positioning plates on the left and right sides respectively, place the fifth rib plate (14), the sixth rib plate (15), and the seventh rib plate (16) in the concave opening of the concave plate of the second support positioning plate (2) in the order of the seventh rib plate, the sixth rib plate, the fifth rib plate, the sixth rib plate, and the seventh rib plate, place the two inclined plates in the two rows of L-shaped plates on the front and back sides of the fixture bottom plate with the right end close to the inclined plate end positioning plate; Step 4: Spot weld all ribs and inclined plates to fix the relative positions of the components; Step 5: Take out the bracket assembly after spot welding from the fixture, and then place the bracket upper plate (6) on it for spot welding, and spot weld the reinforcing process plate on the bracket upper plate (6), the reinforcing process plate being two rectangular plates; Step 6: Assemble the bracket base plate (8) and the above components, adjust the position, and then spot weld the bracket base plate (8) and the components; Step 7: Complete the welding of the two components according to the above steps, fit the two component bracket bottom plates together, align them and perform spot fixing to form a stable welding structure; Step 8: Use the handle assembly to align the handles with the sample assembly, and spot weld each handle to a first rib plate to ensure that each handle is installed in the correct position; Step 9: Use pulse power to weld all welds of the bracket assembly; Step 10: Grind and disassemble the welding points connecting the two components, and remove the reinforcing plate on the bracket upper plate (6).

[0006] When using pulse power to weld all welds of the bracket assembly, the alternating position welding method is adopted to ensure uniform stress distribution during welding and reduce deformation.

[0007] When processing the parts of the bracket assembly, advanced fiber laser cutting methods are used to cut the parts of the bracket assembly according to the precise design dimensions to ensure that the dimensional accuracy is controlled within ±0.1mm. After cutting, the parts are leveled using a plate leveling machine to further improve the flatness of the parts, laying the foundation for the subsequent high-precision assembly of the bracket assembly. At the same time, the edges of all parts are carefully polished and chamfered to optimize the assembly conditions of the welding joints and facilitate the smooth progress of subsequent welding operations.

[0008] The first rib plate (9), the second rib plate (10) and the third rib plate (11) are made from a whole piece of steel plate of the same thickness by laser cutting.

[0009] When pulse power supply welding, the wire diameter is 1mm, the welding current is 180A, and the welding voltage is 24V.

[0010] The beneficial effects of the present invention are: the present invention improves dimensional accuracy and stability: by optimizing the welding sequence and method, using special fixtures and other measures, the welding deformation is effectively reduced, and the dimensional accuracy and stability of the bracket assembly are significantly improved, so that it can better meet the support requirements of large ship equipment and structures, and ensure the safety and reliability of ship operation. The present invention improves welding quality and reliability: precise welding parameter setting and strict welding pre-treatment effectively reduce the occurrence of welding defects such as pores and cracks, enhance the strength and reliability of the bracket assembly, extend its service life, and reduce maintenance costs during ship operation. The present invention improves production efficiency and reduces costs: reasonable process design and optimized welding process significantly shorten welding time and construction cycle, improve production efficiency, reduce manpower, material and time costs, and enhance the market competitiveness of shipbuilding enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the welding fixture of the present invention; Figure 2 This is a three-view schematic diagram of a bracket assembly used on a large ship according to the present invention; Figure 3This is a schematic diagram of the inclined plate structure of the present invention; Figure 4 This is a schematic diagram of the first rib structure of the present invention; Figure 5 It is a schematic diagram of the second rib structure of the present invention; Figure 6 This is a schematic diagram of the third rib structure of the present invention; Figure 7 This is a schematic diagram of the fourth stiffener structure of the present invention; Figure 8 This is a schematic diagram of the fifth stiffener structure of the present invention; Figure 9 This is a schematic diagram of the sixth stiffener structure of the present invention; Figure 10 This is a schematic diagram of the seventh stiffener structure of the present invention; Figure 11 This is a schematic diagram of the handle assembly sample structure of the present invention; Figure 12 It is a schematic diagram of the welding sequence of the present invention; Among them, 1. The first supporting positioning plate, 2. The second supporting positioning plate, 3. The third supporting positioning plate, 4. The inclined plate end positioning plate, 5. The inclined plate supporting positioning plate, 6. The upper plate of the bracket, 7. The inclined plate of the bracket, 8. The bottom plate of the bracket, 9. The first rib plate, 10. The second rib plate, 11. The third rib plate, 12. The handle, 13. The fourth rib plate, 14. The fifth rib plate, 15. The sixth rib plate, 16. The seventh rib plate. DETAILED DESCRIPTION

[0012] like Figure 2 The figure shows the bracket assembly used on large ships according to the present invention. Its manufacturing quality has a crucial impact on the overall performance of the ship. However, traditional bracket assembly welding processes have many drawbacks, such as severe welding deformation, which makes it difficult to ensure the dimensional accuracy of the bracket assembly; large fluctuations in welding quality, resulting in frequent defects such as pores and cracks; and low production efficiency, which significantly restricts the progress of ship construction and increases manufacturing costs.

[0013] The present invention provides a support assembly welding process for large ships, aiming to overcome the difficulties of large welding deformation, unstable quality and low production efficiency in traditional support assembly welding processes.

[0014] Specifically include the following contents.

[0015] A welding process for bracket components used on large ships is carried out in the following steps: Step 1: Prepare welding fixtures, such as Figure 1 As shown, it includes a fixture base plate, a first support positioning plate 1, a second support positioning plate 2, a third support positioning plate 3, an inclined plate end positioning plate 4 and an inclined plate support positioning plate 5.

[0016] The fixture bottom plate is a rectangular parallelepiped plate greater than or equal to (greater than or equal to) 1600mm*650mm*6mm in length, width and height. In one embodiment, it is a rectangular parallelepiped plate of 2000mm*700mm*10mm.

[0017] The first support positioning plate 1 is a symmetrical structure of two long strips fixed on the front and rear sides of the upper surface of the clamp base plate. Each long strip has a first support position, two second support positions, and two third support positions. The first support position is a gap perpendicular to the clamp base plate, the second support position is two slopes in a symmetrical structure, and the third support position is two symmetrical slopes. There is a triangular opening on the upper side of the long strip corresponding to the second and third support positions. The upper parts of the slopes corresponding to the second and third support positions are inclined toward the center of the upper surface of the clamp base plate. The angle (acute angle) between the slope of the second support position and the upper surface of the clamp base plate is greater than the angle (acute angle) between the slope of the third support position and the upper surface of the clamp base plate. The first support positioning plate 1 is a support positioning plate for the first rib plate 9, the second rib plate 10, and the third rib plate 11. The first support position is used to position and install the first rib plate 9, the second support position is used to position and install the second rib plate 10, and the third support position is used to position and install the second rib plate 10. The symmetry center of the first supporting positioning plate 1 is the central plane of the fixture bottom plate in the front-to-back direction, and each long strip plate also forms a symmetrical structure with respect to the first supporting position.

[0018] The second support and positioning plate 2 comprises multiple concave plates arranged in parallel with the same structure. The concave plates of the second support and positioning plates are arranged in a row along the centerline of the length of the fixture base plate and fixed to the upper surface of the fixture base plate. All concave plates of the second support and positioning plates are perpendicular to the fixture base plate, with the concave openings facing upward. All concave plates of the second support and positioning plates are parallel to the right side of the fixture base plate. Each concave plate is of the same size, with the width of the central concave opening equal to the thickness of the first rib 9. The thickness of all ribs is the same. The second support and positioning plate 2 serves as the support and positioning plate for the fifth rib 14, the sixth rib 15, and the seventh rib 16.

[0019] The third support and positioning plate 3 is composed of four concave plates, two of which are fixed to the left and right sides of the upper surface of the fixture base. Each concave plate of the third support and positioning plate is perpendicular to the concave plates of each second support and positioning plate. Each concave plate is of the same size, with the width of the central concave opening equal to the thickness of the first rib 9. All ribs have the same thickness. The third support and positioning plate 3 serves as the support and positioning plate for the fourth rib 13.

[0020] Two inclined plate end positioning plates 4 are fixed to the upper right and lower right corners of the fixture base plate. Each inclined plate end positioning plate is a rectangular parallelepiped plate and is parallel to the concave plate of each second supporting positioning plate. The inclined plate end positioning plates are located outside all concave plates. The inclined plate end positioning plates 4 are used to fix the inclined plate end.

[0021] The inclined plate support positioning plate 5 is a two-row L-shaped plate symmetrically mounted on the upper surface of the fixture bottom plate, and each L-shaped plate in each row is parallel to the concave plate of the second support positioning plate. The inclined plate support positioning plate 5 is a supporting positioning plate for the inclined plate 7.

[0022] The welding fixtures utilize a laser cutting process to ensure assembly accuracy within 1mm. During assembly and welding, the fixtures securely hold the components, effectively limiting displacement and deformation, ensuring component positional accuracy and providing a strong guarantee for high-quality welding.

[0023] Step 2: Prepare the parts of the bracket assembly, such as Figure 2 As shown, the components of the frame assembly include a bracket upper plate 6, a bracket inclined plate 7, a bracket bottom plate 8, a first rib plate 9, a second rib plate 10, a third rib plate 11, a handle 12, a fourth rib plate 13, a fifth rib plate 14, a sixth rib plate 15, and a seventh rib plate 16.

[0024] The bracket upper plate 6 is a rectangular plate. The dimensions of the bracket upper plate 6 are 400mm*260*10mm, and there are four runway holes of the same size on the bracket upper plate 6. When preparing the bracket upper plate 6, it is necessary to mark the connection points with other rib plates and inclined plates to facilitate subsequent welding.

[0025] like Figure 3 As shown, the bracket inclined plates 7 are two hollowed-out rectangular parallelepiped plates plus an isosceles trapezoidal plate; the bracket base plate 8 is a rectangular parallelepiped plate parallel to the bracket upper plate 6, with the projection of the bracket upper plate 6 within the bracket base plate 8 located within the bracket base plate 8. In one embodiment, the rectangular parallelepiped plus isosceles trapezoidal plate has dimensions of 1600mm*91*5mm, while the isosceles trapezoidal plate has dimensions of 350mm upper base, 1600mm lower base, 5mm thickness, 408mm height, and six rounded hollow through holes.

[0026] like Figure 4 As shown, the first rib 9 is a hollowed-out isosceles trapezoidal plate. In one embodiment, the isosceles trapezoidal plate has an upper base of 220 mm, a lower base of 600 mm, a thickness of 5 mm, and a height of 464 mm. Sharp edges are chamfered.

[0027] like Figure 5As shown, the second rib 10 is an isosceles trapezoidal plate with a hollowed-out upper and lower bases that are the same height as the first rib 9 and greater than the first rib 9. In one embodiment, the isosceles trapezoidal plate has an upper base of 220 mm, a lower base of 600 mm, a thickness of 5 mm, and a height of 503.1 mm. Sharp edges are chamfered.

[0028] like Figure 6 As shown, the third rib 11 is an isosceles trapezoidal plate with an upper base and lower base that are the same height as the second rib 10 and greater than the height of the second rib 10. In one embodiment, the isosceles trapezoidal plate has dimensions of 220 mm at the upper base, 600 mm at the lower base, 5 mm in thickness, and 641.4 mm in height. Sharp edges are chamfered.

[0029] like Figure 7 As shown, the fourth ribs 13 are two identical isosceles trapezoidal plates; in one embodiment, the right-angled trapezoidal plates have an upper base of 531.2 mm, a lower base of 600 mm, a thickness of 5 mm, and a height of 84 mm. Sharp edges are chamfered.

[0030] like Figure 8 As shown, the fifth rib 14 is two equal height rectangular trapezoidal plates of the same height as the fourth rib 13. like Figure 9 As shown, the sixth rib plate 15 is two compatible quadrilateral plates with parallel upper and lower bases.

[0031] like Figure 10 As shown, the seventh rib plate 16 is two identical quadrilateral plates with parallel upper and lower bases.

[0032] like Figure 11 There are two handles 12, each of which is made of two hand-matching templates; Step 3, place the welding fixture on a horizontal plane, place the first rib plate 9 in the first support position, place the two second rib plates on the two second support positions, place the two third rib plates on the two third support positions, place the two fourth rib plates in the concave plates of the second support positioning plates on the left and right sides respectively, place the fifth rib plate 14, the sixth rib plate 15, and the seventh rib plate 16 in the concave opening of the concave plate of the second support positioning plate 2 in the order of the seventh rib plate, the sixth rib plate, the fifth rib plate, the sixth rib plate, and the seventh rib plate, place the two inclined plates in the two rows of L-shaped plates on the front and back sides of the fixture bottom plate, and the right ends are close to the inclined plate end positioning plates; Step 4: Spot weld all ribs and inclined plates to fix the relative positions of the components; Step 5: Take the bracket assembly that has been spot-welded out of the fixture, then place the bracket upper plate 6 on it for spot welding, and spot weld a reinforcement plate on the bracket upper plate 6. The reinforcement plate is a rectangular plate. Step 6: Assemble the bracket base plate 8 with the above components, adjust the positions, and then spot weld the bracket base plate 8 and the components.

[0033] After spot welding is completed, use a steel ruler, a right-angle ruler, and a box ruler to check the height difference on both sides of the upper plate position to ensure that it does not exceed 1mm; the flatness of the bracket upper plate 6 is not greater than 0.5mm, and the flatness of the bracket bottom plate 8 is not greater than 1mm.

[0034] Step 7: Complete the welding of the two components according to the above steps, fit the two component bracket bottom plates together, align them and perform spot fixing to form a stable welding structure; Step 8: Use the handle assembly to align the handles with the sample assembly, and spot weld each handle to a first rib plate to ensure that each handle is installed in the correct position; Step 9: Use pulse power to weld all welds of the bracket assembly; Step 10: Grind and disassemble the welding points connecting the two components, and remove the reinforcing plate on the upper plate 6 of the bracket.

[0035] When using pulse power to weld all welds of the bracket assembly, use the method of alternating position welding to ensure uniform stress distribution during welding and reduce deformation. Figure 11 As shown, When processing the parts of the bracket assembly, advanced fiber laser cutting methods are used to cut the parts of the bracket assembly according to the precise design dimensions to ensure that the dimensional accuracy is controlled within ±0.1mm. After cutting, the parts are leveled using a plate leveling machine to further improve the flatness of the parts, laying the foundation for the subsequent high-precision assembly of the bracket assembly. At the same time, the edges of all parts are carefully polished and chamfered to optimize the assembly conditions of the welding joints and facilitate the smooth progress of subsequent welding operations.

[0036] The first rib 9, the second rib 10 and the third rib 11 are made of a whole steel plate of the same thickness by laser cutting; When pulse power supply welding, the wire diameter is 1mm, the welding current is 180A, and the welding voltage is 24V.

[0037] In one embodiment.

[0038] Parameter setting: In order to solve the problem of welding deformation, six welding parameter test schemes were designed by comprehensively considering factors such as wire diameter, welding peak current, and welding peak voltage. The specific schemes are shown in Table 1 below.

[0039] Plan No. Wire diameter Welding peak current Welding peak voltage 1 Φ1.0 220A 30V 2 Φ1.0 200A 28V 3 Φ1.0 180A 24V 4 Φ1.2 220A 25V 5 Φ1.2 200A 24V 6 Φ1.2 180A 23V Table 1 Twelve ungrooved test plates measuring t5mm × 200mm × 400mm were prepared, with each group consisting of two. Fillet joint tests were conducted using a pulsed power supply according to the six schemes shown in Table 1. After the test plates were welded and the welds passed the visual inspection, two specimens were prepared from each group for deformation testing. The six test results are shown in Table 2 below: Plan No. Test board 1 Deformation 1 Test board 2 Deformation 2 1 No defects 1° No defects 1.2° 2 No defects 0.8° No defects 0.9° 3 No defects 0.2° No defects 0.3° 4 No defects 1.3° No defects 1.4° 5 No defects 1° No defects 1° 6 No defects 0.5° No defects 0.4° Table 2 In-depth analysis of the test results shows that wire diameter, welding current, and welding voltage are key factors affecting welding deformation. Comparison shows that when pulse welding is used with a wire diameter of 1mm, a welding current of 180A, and a welding voltage of 24V, fillet welding exhibits minimal welding deformation, fully meeting design requirements.

[0040] Welding sequence execution: Welding is carried out strictly in accordance with the optimized welding sequence, using the method of alternating position welding. The specific welding sequence is as follows: Figure 12 As shown, the sequential welding from ① to ⑩ ensures uniform stress distribution during welding and reduces deformation.

[0041] Welding process control: During the welding process, pay close attention to the stability of the welding arc, accurately control the welding angle and wire feeding method, adopt appropriate swinging method for welding, ensure uniform weld width and penetration depth, ensure good weld formation, and meet high-quality welding standards.

[0042] After welding is completed, the bracket assembly is strictly inspected.

[0043] Post-weld treatment: Deformation correction: Carefully check the deformation of the bracket assembly and use the bracket assembly to correct it. Correct the deformed parts. Through professional correction technology and operation, the size and shape meet the design requirements and restore the accuracy and stability of the bracket assembly.

[0044] Quality Inspection: Welding quality is comprehensively inspected using various methods, including visual inspection and ultrasonic testing. Visual inspection primarily checks for surface defects such as pores, cracks, and undercuts. Ultrasonic testing is used to check the internal quality of welds, ensuring they are free of defects such as lack of fusion and slag inclusions, ensuring that the weld quality of the bracket assembly meets high standards.

Claims

1. A welding process for bracket components used on large ships, characterized by: Follow the steps below Step 1, prepare a welding fixture, the welding fixture comprises a fixture base plate, a first support positioning plate (1), a second support positioning plate (2), a third support positioning plate (3), an inclined plate end positioning plate (4) and an inclined plate support positioning plate (5); the fixture base plate is a rectangular plate; the first support positioning plate (1) is two long strips fixed on the front and rear sides of the upper surface of the fixture base plate in a symmetrical structure, each long strip has a first support position, two second support positions and two third support positions, the first support position is a gap perpendicular to the fixture base plate, the second support position is two slopes in a symmetrical structure, and the third support position is two symmetrical slopes; the second support positioning plate (2) is a plurality of concave plates arranged in parallel with the same structure, the concave plates of the second support positioning plates are along the center of the length direction of the fixture base plate. The lines are arranged in a row and fixed on the upper surface of the fixture base plate, and the concave plates of all the second support positioning plates are perpendicular to the fixture base plate and the concave openings are facing upwards, and the concave plates of all the second support positioning plates are parallel to the right side of the fixture base plate; the third support positioning plate (3) is composed of four concave plates, and two concave plates of the third support positioning plates are fixed on the left and right sides of the upper surface of the fixture base plate, and the concave plate of each third support positioning plate is perpendicular to the concave plate of each second support positioning plate; the inclined plate end positioning plates (4) have two pieces and are respectively fixed on the upper right corner and the lower right corner of the upper surface of the fixture base plate, and each inclined plate end positioning plate is a rectangular plate and is parallel to the concave plate of each second support positioning plate; the inclined plate support positioning plates (5) are two rows of L-shaped plates installed on the upper surface of the fixture base plate in a symmetrical structure, and each L-shaped plate of each row of L-shaped plates is parallel to the concave plate of the second support positioning plate; Step 2, prepare the parts of the bracket assembly, the parts of the bracket assembly include a bracket upper plate (6), a bracket inclined plate (7), a bracket bottom plate (8), a first rib plate (9), a second rib plate (10), a third rib plate (11), a handle (12), a fourth rib plate (13), a fifth rib plate (14), a sixth rib plate (15), and a seventh rib plate (16); the bracket upper plate (6) is a rectangular plate; the bracket inclined plate (7) is two hollowed-out rectangular plates + an isosceles trapezoidal plate; the bracket bottom plate (8) is a rectangular plate parallel to the bracket upper plate (6), and the projection of the bracket upper plate (6) in the bracket bottom plate (8) is inside the bracket bottom plate (8); the first rib plate (9) is a hollowed-out rectangular plate An isosceles trapezoidal plate; the second rib plate (10) is an isosceles trapezoidal plate with a hollow upper and lower bottom having the same height as the first rib plate (9) and a height greater than the first rib plate (9); the third rib plate (11) is an isosceles trapezoidal plate with an upper and lower bottom having the same height as the second rib plate (10) and a height greater than the second rib plate (10); the fourth rib plate (13) is two identical isosceles trapezoidal plates; the fifth rib plate (14) is two right-angled trapezoidal plates with the same height as the fourth rib plate (13); the sixth rib plate (15) is two identical quadrilateral plates with parallel upper and lower bottoms; the seventh rib plate (16) is two identical quadrilateral plates with parallel upper and lower bottoms; there are two handles (12), each of which is paired with a sample plate of two handles; Step 3: Place the welding fixture on a horizontal surface, place the first rib plate (9) on the first support position, place the two second rib plates (10) on the two second support positions, place the two third rib plates (11) on the two third support positions, place the two fourth rib plates (12) in the concave plates of the second support positioning plates on the left and right sides respectively, place the fifth rib plate (14), the sixth rib plate (15), and the seventh rib plate (16) in the concave opening of the concave plate of the second support positioning plate (2) in the order of the seventh rib plate, the sixth rib plate, the fifth rib plate, the sixth rib plate, and the seventh rib plate, place the two inclined plates in the two rows of L-shaped plates on the front and back sides of the fixture bottom plate with the right end close to the inclined plate end positioning plate; Step 4: Spot weld all ribs and inclined plates to fix the relative positions of the components; Step 5: Take out the bracket assembly after spot welding from the fixture, and then place the bracket upper plate (6) on it for spot welding, and spot weld the reinforcing process plate on the bracket upper plate (6), the reinforcing process plate being two rectangular plates; Step 6: Assemble the bracket base plate (8) and the above components, adjust the position, and then spot weld the bracket base plate (8) and the components; Step 7: Complete the welding of the two components according to the above steps, fit the two component bracket bottom plates together, align them and perform spot fixing to form a stable welding structure; Step 8: Use the handle assembly to align the handles with the sample assembly, and spot weld each handle to a first rib plate to ensure that each handle is installed in the correct position; Step 9: Use pulse power to weld all welds of the bracket assembly; Step 10: Grind and disassemble the welding points connecting the two components, and remove the reinforcing plate on the bracket upper plate (6).

2. The welding process for a bracket assembly for a large ship according to claim 1 is characterized in that: When using pulse power to weld all welds of the bracket assembly, the alternating position welding method is adopted to ensure uniform stress distribution during welding and reduce deformation.

3. The welding process for a bracket assembly for a large ship according to claim 1 is characterized in that: When processing the parts of the bracket assembly, advanced fiber laser cutting methods are used to cut the parts of the bracket assembly according to the precise design dimensions to ensure that the dimensional accuracy is controlled within ±0.1mm. After cutting, the parts are leveled using a plate leveling machine to further improve the flatness of the parts, laying the foundation for the subsequent high-precision assembly of the bracket assembly. At the same time, the edges of all parts are carefully polished and chamfered to optimize the assembly conditions of the welding joints and facilitate the smooth progress of subsequent welding operations.

4. The welding process for a bracket assembly for a large ship according to claim 1 is characterized in that: The first rib plate (9), the second rib plate (10) and the third rib plate (11) are made from a whole piece of steel plate of the same thickness by laser cutting.

5. The welding process for a bracket assembly for a large ship according to claim 1 is characterized in that: When pulse power supply welding, the wire diameter is 1mm, the welding current is 180A, and the welding voltage is 24V.

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