Method for straightening TA3 titanium alloy plate for shipbuilding

Abstract

The application discloses a ship TA3 titanium alloy plate correcting method, and the correcting method comprises the following steps in sequence: preheating, cleaning the TA3 titanium alloy plate and the ball flat titanium; performing firework correction on the ball flat titanium; performing firework correction on the middle region of the plate; performing firework correction on the free edge of the plate; performing firework correction on the periphery of the opening on the plate; and performing firework correction on the weld seam. The correcting method can effectively correct the titanium alloy plate and the profile, improve the flatness and surface quality of the product, and has the advantages of simple process, convenient operation, greatly reduced production cost and period, and guaranteed performance and structural stability of the ship TA3 titanium alloy material.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding, and in particular to a method for straightening TA3 titanium alloy plates for marine applications. Background Technology

[0002] TA3 titanium alloy is widely used in aerospace, shipbuilding, and medical device industries due to its excellent physical and chemical properties. However, titanium alloys are prone to deformation during processing, especially plates and profiles after rolling and welding, which often result in bending, twisting, and other defects, affecting product quality and performance. In the aerospace field, TA3 titanium alloy plates are typically riveted, resulting in minimal deformation. Therefore, conventional straightening methods for TA3 titanium alloy plates used in aerospace are unsuitable for straightening TA3 titanium alloy plates with welds used in marine applications. Straightening of marine alloy plates typically employs mechanical straightening and heat treatment, but conventional straightening methods require block straightening, which is slow, complex, and has limited straightening effect, resulting in high plate straightening costs. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this application provides a method for straightening marine TA3 titanium alloy plates, thereby solving the technical problems of low straightening efficiency, complex processes, limited straightening effects, and high straightening costs in existing technologies.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solution: A method for straightening marine TA3 titanium alloy plates, wherein the surface of the marine TA3 titanium alloy plates is welded with spherical flat titanium made of TA3 titanium alloy, and the straightening includes the following steps: S1. Preheat the spherical flat titanium and the plate. After preheating, wipe the surface of the spherical flat titanium and the plate clean to remove surface impurities. Then, evenly apply a titanium alloy special anti-oxidation coating to the surface of the spherical flat titanium and the plate and let it air dry naturally. S2. Perform fire straightening on the flattened titanium spheres; S3. After the flattened titanium spheres to be straightened are welded to the plate according to the design position of the profile, the middle area of ​​the plate is straightened by fire. S4. Perform fire straightening on the free edges of the board material; S5. Perform heat straightening around the openings on the board; S6. After the plates to be straightened are butt-welded according to the design, the welds are straightened by fire. The flame used for pyrotechnic straightening is a neutral flame, the thickness of marine TA3 titanium alloy is usually greater than 5mm, and the heating temperature for pyrotechnic straightening is below 850℃.

[0005] In one embodiment, the preheating temperature in S1 is higher than 300°C, and after preheating, the surfaces of the spherical titanium and the plate are wiped clean with acetone or anhydrous ethanol.

[0006] In one embodiment, the spherical flat titanium includes a face plate and a web plate that intersect perpendicularly. The intersection of the face plate and the web plate is defined as the root. The width of the face plate is b. S2 specifically includes the following steps: determining the bending type of the spherical flat titanium; if the outer edge of the face plate away from the root bends and deforms towards the root, then the outer surface of the face plate is first heated in interval triangles. The triangles are isosceles triangles, and the base of each triangle is set along the root. The heating sequence is from the root to the outer side of the face plate. The height of the triangle is b / 3. The triangle heating is completed by multiple strip heating. After heating the outer surface of the face plate, triangle heating is performed on the inner surface of the face plate at the position corresponding to the triangle heating of the outer face plate. The heating sequence of the triangle heating on the inner surface of the face plate is the same as the heating sequence of the triangle heating on the outer surface of the face plate. If the outer edge of the panel away from the root bends and deforms away from the root, the outer surface of the panel is first heated in intervals of triangles. The triangles are isosceles triangles, and the base of each triangle is set along the outer edge of the panel. The heating sequence is from the part closest to the root to the outside of the panel. The height of the triangle is 2b / 3. The triangle heating is completed by multiple strip heating. After heating the outer surface of the panel, triangle heating is performed on the inner surface of the panel at the position corresponding to the triangle heating of the outer panel. The heating sequence of the triangle heating on the inner surface of the panel is the same as the sequence of the triangle heating on the outer surface of the panel.

[0007] In one implementation, the distance between the midlines of the triangles is 750-850mm, and the length of the base of the triangle is half the height of the triangle; after the strip heating is completed, water cooling is performed immediately, and after the triangle heating is completed, the triangular area is water cooled.

[0008] In one implementation, step S3 specifically includes the following steps: S301. The sheet metal is placed horizontally, and the spherical flattened titanium is fixed to the lower surface of the sheet metal. If the lower ends of the spherical flattened titanium are of uniform height, the sheet metal heights between the spherical flattened titanium are inconsistent, and there is a concave surface between the spherical flattened titanium, then the sheet metal is deformed as a "lean horse"; if the lower ends of the spherical flattened titanium are inconsistent, the sheet metal heights between the spherical flattened titanium are inconsistent, and there is one of a convex or concave surface between the spherical flattened titanium, then the sheet metal is deformed as an "undulating wave"; if the lower ends of the spherical flattened titanium are inconsistent, and there are both convex and concave surfaces between the spherical flattened titanium, then the sheet metal is deformed as an "uneven"; S302. Determine the type of deformation in the middle area of ​​board 2. If the board is deformed into a "lean horse" shape, proceed to S303; if the board is deformed into an "undulating wave" shape, proceed to S304; if the board is deformed into an "uneven" shape, proceed to S305. S303. Use a long strip heating method to heat the upper surface of the plate at the position corresponding to the location of the spherical flat titanium 1; S304. Heat the position of the spherical flat titanium on both sides of the concave surface on the upper surface of the plate using a long strip heating method, and then heat the intersection of the concave surface after correction and the convex surface on the upper surface of the plate using a long strip heating method. S305. Use a long strip heating method to heat the upper surface of the plate at the position corresponding to the spherical flat titanium. Then, use a heating method to correct the deformation at the intersection of the concave and convex surfaces between adjacent spherical flat titanium on the upper surface of the plate. If the deformation still exists, use a heating method to correct the deformation at the convex surface between adjacent spherical flat titanium on the upper surface of the plate.

[0009] In one implementation, step S4 specifically includes the following steps: With the side of the plate with the flattened titanium ball facing upwards, fix the free edge of the plate to be corrected to the steel frame using a caliper. Use a heating method to correct the uneven area formed by the concave or convex surface of the free edge, with the heating point gradually moving from the inside of the plate towards the free edge.

[0010] In one implementation, step S5 specifically includes the following steps: If the opening on the board is circular, a wedge heating method is used to correct the periphery of the circular opening. The bottom edge of the wedge is located at the rounded edge of the circular opening. The wedge around the circular opening is symmetrical about the center, and the central axis of the wedge is set along the radial direction of the circular opening. When wedge heating the periphery of the circular opening, the heating sequence is symmetrical about the center, and the wedge heating path is from the outside of the circular opening towards the circular opening. If the opening on the board is rectangular, a wedge heating method is used to correct the periphery of the rectangular opening. The bottom edge of the wedge is located at the rounded corner of the rectangular opening, and the central axis of the wedge is set along the diagonal of the rectangular opening. When wedge heating the periphery of the rectangular opening, the heating sequence is in the same direction along the transverse or longitudinal direction of the board, and the wedge heating path is from the outside of the rectangular opening towards the rectangular opening.

[0011] In one implementation, step S6 specifically includes the following steps: If the welded plate is convex upwards as a whole, and the weld is located on the curved ridge of the convex surface, and there is deformation on both sides of the weld, then the curved surface is straightened by heating with short strips on both sides of the weld, with the heating line parallel to the weld. If the plate on both sides of the weld is convex upwards respectively, and the weld is located on the curved ridge where the two convex surfaces intersect, then the curved surface is straightened by heating with long strips on both sides of the weld, with the heating line perpendicular to the weld.

[0012] Compared with the prior art, this application has at least the following beneficial effects: The marine TA3 titanium alloy sheet straightening method of this invention sequentially performs fire straightening on the flattened titanium, the middle area of ​​the sheet, the free edge of the sheet, the opening of the sheet, and the weld seam. This method can effectively straighten titanium alloy sheets and profiles, improving the flatness and surface quality of the products. Compared with traditional marine TA3 titanium alloy sheet straightening methods, this invention has a simpler process and is easier to operate, which can greatly reduce production costs and cycle time. Because this invention uses fire straightening, it can control parameters such as heating temperature, applied force, and cooling rate during the straightening process, ensuring that the performance and structural stability of the TA3 titanium alloy material are not affected. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the lateral inward bending correction of spherical flat titanium in an embodiment of this application; Figure 2 This is a schematic diagram of the lateral outward bending correction of spherical flat titanium in an embodiment of this application; Figure 3 This is a schematic diagram of longitudinal upward convex bending correction of spherical flat titanium in an embodiment of this application; Figure 4 This is a schematic diagram of longitudinal downward convex bending correction of spherical flat titanium in an embodiment of this application; Figure 5 This is a schematic diagram of the "lean horse" deformation correction of the sheet metal in the embodiments of this application; Figure 6 This is a schematic diagram of the "undulating wave" deformation correction of the sheet metal in the embodiments of this application; Figure 7 This is a schematic diagram of the "concave and convex" deformation correction of the sheet metal in the embodiments of this application; Figure 8 This is a schematic diagram of the free edge correction of the sheet metal in an embodiment of this application; Figure 9 This is a schematic diagram of the plate hole correction in an embodiment of this application; Figure 10 This is a schematic diagram of the lateral deformation correction of the butt joint of the plates in an embodiment of this application; Figure 11 This is a schematic diagram of longitudinal deformation correction of the butt joint of the plates in an embodiment of this application; Reference numerals: 1. Flattened titanium sphere; 101. Panel; 102. Web; 2. Plate; 3. Kamma; 4. Concave-convex area; 501. Circular opening; 502. Rectangular opening; 6. Weld; 7. Heating wire. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0015] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0016] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms and should not be construed as indicating or implying relative importance. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0017] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical connection or internal connection between two components. They can be direct connection or indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0018] To better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0019] This embodiment provides a method for straightening marine TA3 titanium alloy plates, wherein a spherical flat titanium 1 made of TA3 titanium alloy is welded to the surface of the marine TA3 titanium alloy plate, including the following steps: S1. Preheat the spherical flat titanium 1 and the plate 2 to a temperature higher than 300℃. After preheating, wipe the surface of the spherical flat titanium 1 and the plate 2 with acetone or anhydrous ethanol to remove surface impurities. Then, evenly coat the surface of the spherical flat titanium 1 and the plate 2 with a special anti-oxidation coating for titanium alloys and let it air dry naturally. S2. Perform fire straightening on the flattened titanium 1; S3. After the flattened titanium 1 to be straightened is welded to the plate 2 according to the design position of the profile, the middle area of ​​the plate 2 is straightened by fire. S4. Perform fire straightening on the free edges of board 2; S5. Perform heat straightening around the openings on board 2; S6. After the plates to be straightened are butted and welded according to the design, weld 6 is straightened by fire.

[0020] The flame used for the above-mentioned pyrotechnic straightening is a neutral flame. The thickness of marine TA3 titanium alloy is usually greater than 5mm, and the heating temperature for pyrotechnic straightening is below 850℃.

[0021] Step S2 specifically includes the following steps: The spherical flattened titanium 1 includes a face plate 101 and a web plate 102 that intersect perpendicularly. The intersection of the face plate 101 and the web plate 102 is defined as the root. The width of the face plate 101 is b, and the height of the web plate 102 is a. The bending type of the spherical flattened titanium 1 is determined by the following: if the outer edge of the face plate 101 away from the root bends and deforms towards the root, as shown in the attached figure... Figure 1 The spherical flat titanium transverse inward bend and attachment shown Figure 3 The spherical flat titanium shown is longitudinally convex and bent. First, the outer surface of panel 101 is heated in interval triangles. The triangles are isosceles triangles, with the base of each triangle set along the root. The distance between the midlines of the triangles is 750-850mm. The heating sequence is from the root to the outside of panel 101. The height of the triangle is b / 3, and the length of the base of the triangle is half the height of the triangle. The triangle heating is completed by multiple strip heating. After heating the outer surface of panel 101, triangle heating is performed on the inner surface of panel 101 at the position corresponding to the triangle heating of the outer panel. The heating sequence of the triangle heating on the inner surface of panel 101 is the same as the sequence of the triangle heating on the outer surface of panel 101. If the outer edge of panel 101 away from the root bends and deforms away from the root, as shown in the attached... Figure 2 The spherical flattened titanium transverse outward bending and attachment shown Figure 4 The spherical flattened titanium is shown to be bent longitudinally downwards. First, the outer surface of panel 101 is heated in intervals of triangular shapes. These triangles are isosceles triangles, with their bases along the outer edges of panel 101. The distance between the midlines of the triangles is 750-850mm. The heating sequence proceeds from near the root outwards from the outer edge of panel 101. The height of each triangle is 2b / 3, and the length of its base is half its height. Triangular heating is achieved through multiple strip heating elements. After heating the outer surface of panel 101, triangular heating is performed on the inner surface of panel 101 at the positions corresponding to the triangular heating on the outer panel. The heating sequence for the inner surface of panel 101 is the same as that for the outer surface. Water cooling follows immediately after the strip heating is completed, and water cooling is then applied to the triangular areas after the triangular heating is finished.

[0022] Step S3 specifically includes the following steps: S301. Plate 2 is placed horizontally, and spherical flat titanium 1 is fixed to the lower surface of plate 2. If the lower end height of spherical flat titanium 1 is consistent, the height of plate 1 between spherical flat titanium 1 is inconsistent, and there is a concave surface between the plate 1 between spherical flat titanium 1, then plate 2 is deformed as a "lean horse"; if the lower end height of spherical flat titanium 1 is inconsistent, the height of plate 1 between spherical flat titanium 1 is inconsistent, and there is one of convex or concave surfaces between the plate 1 between spherical flat titanium 1, then plate 2 is deformed as an "undulating wave"; if the lower end height of spherical flat titanium 1 is inconsistent, and there are both convex and concave surfaces between the plate 1 between spherical flat titanium 1, then plate 2 is deformed as an "uneven concave wave". S302. Determine the type of deformation in the middle area of ​​board 2. If board 2 is deformed into a "lean horse" shape, proceed to S303; if board 2 is deformed into an "undulating wave" shape, proceed to S304; if board 2 is deformed into a "concave-convex" shape, proceed to S305. S303. Use a long strip heating method to heat the upper surface of plate 2 at the position corresponding to the location of the spherical flat titanium 1, such as... Figure 5 As indicated by arrow A; S304. The positions of the spherical flattened titanium 1 on both sides of the concave surface on the upper surface of plate 2 are heated using a long strip heating method, such as... Figure 6 As shown by the arrow, the area where the concave surface meets the convex surface after correction is then heated on the upper surface of board 2 using a long strip heating method, as shown. Figure 6 As indicated by the arrow; S305. Use a long strip heating method to heat the upper surface of plate 2 at the position corresponding to the location of the spherical flat titanium 1, such as... Figure 7 As shown by arrow A, the intersection of the concave and convex surfaces between adjacent spherical flat titanium 1 on the upper surface of plate 2 is then corrected using a heating method, as shown below. Figure 7 As shown by arrow B, the heating method used at the intersection of the concave and convex surfaces can be a long strip heating method, a short strip heating method, or a cross-shaped heating method. If deformation still exists, it should be corrected by heating at the convex surface between adjacent spherical flat titanium 1 on the upper surface of plate 2. Figure 7 As shown by arrow C.

[0023] Step S4 specifically includes the following steps: With the side of plate 2 with the spherical flat titanium 1 fixed facing upwards, fix the free edge of plate 2 to be corrected to the steel frame using the caliper 3, as follows. Figure 8 As shown, the concave or convex surface of the free edge is corrected by heating to form uneven area 4. The heating point gradually moves from the inside of the plate 2 to the free edge. The heating method in this step is either strip heating or wedge heating.

[0024] Step S5 specifically includes the following steps: If the opening on plate 2 is a circular opening 501, then a wedge heating method is used to correct the periphery of the circular opening 501. The bottom edge of the wedge is located at the circular edge of the circular opening 501. The wedge around the circular opening 501 is symmetrical about the center, and the central axis of the wedge is set along the radial direction of the circular opening 501. When wedge heating is performed on the periphery of the circular opening 501, the heating sequence is symmetrical about the center. Figure 9 As shown above, heating is performed sequentially in the order of A, B, C, D, E, and F. The wedge heating path starts from the outside of the circular opening 501 and approaches the circular opening 501. If the opening on the plate 2 is a rectangular opening 502, then the wedge heating method is used to correct the periphery of the rectangular opening. The bottom edge of the wedge is located at the rounded corner of the rectangular opening 502, and the central axis of the wedge is set along the diagonal of the rectangular opening 502. When wedge heating is performed on the periphery of the rectangular opening 502, the heating sequence is in the same direction along the transverse or longitudinal direction of the plate 2, such as... Figure 9 As shown below, heating is performed in the order of A, B, C, and D. The wedge heating path starts from the outside of the rectangular opening 502 and approaches the rectangular opening 502.

[0025] To improve the correction effect, in this embodiment, while performing fire correction around the opening, the bent area is also hammered.

[0026] Step S6 specifically includes the following steps: If the welded plate 2 convexes upwards as a whole, and weld 6 is located on the curved ridge of the convex surface, deformation will occur on both sides of weld 6. Figure 10 As shown, the curved surfaces of weld 6 are straightened by heating with short strips on both sides using a flame straightening method, with the heating line 7 parallel to the weld. If the plates 2 on both sides of weld 6 convex upwards after welding, weld 6 is located at the curved ridge where the two convex surfaces intersect, as shown... Figure 11 As shown, the curved surfaces are straightened by heating with long strips on both sides of weld 6, and the heating line 7 is perpendicular to the weld.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A method for straightening marine TA3 titanium alloy plates, characterized in that, The surface of the marine TA3 titanium alloy plate is welded with spherical flat titanium made of TA3 titanium alloy, and the straightening includes the following steps: S1. Preheat the spherical flat titanium and the plate. After preheating, wipe the surface of the spherical flat titanium and the plate clean to remove surface impurities. Then, evenly apply a titanium alloy special anti-oxidation coating to the surface of the spherical flat titanium and the plate and let it air dry naturally. S2. Perform fire straightening on the flattened titanium spheres; S3. After the flattened titanium spheres to be straightened are welded to the plate according to the design position of the profile, the middle area of ​​the plate is straightened by fire. S4. Perform fire straightening on the free edges of the board material; S5. Perform heat straightening around the openings on the board; S6. After the plates to be straightened are butt-welded according to the design, the welds are straightened by fire. The flame used for pyrotechnic straightening is a neutral flame, the thickness of marine TA3 titanium alloy is usually greater than 5mm, and the heating temperature for pyrotechnic straightening is below 850℃.

2. The method for straightening marine TA3 titanium alloy plates according to claim 1, characterized in that, The preheating temperature in S1 is higher than 300°C. After preheating, the surfaces of the flattened titanium and the plate are wiped clean with acetone or anhydrous ethanol.

3. The straightening method for marine TA3 titanium alloy plates according to claim 1, characterized in that, The spherical flattened titanium includes a face plate and a web plate that intersect perpendicularly. The intersection of the face plate and the web plate is defined as the root. The width of the face plate is b. S2 specifically includes the following steps: determining the bending type of the spherical flattened titanium. If the outer edge of the face plate away from the root bends and deforms towards the root, the outer surface of the face plate is first heated in interval triangles. The triangles are isosceles triangles, and the base of each triangle is set along the root. The heating sequence is from the root to the outer side of the face plate. The height of the triangle is b / 3. The triangle heating is completed by multiple strip heating. After heating the outer surface of the face plate, triangle heating is performed on the inner surface of the face plate at the position corresponding to the triangle heating of the outer face plate. The heating sequence of the triangle heating on the inner surface of the face plate is the same as the heating sequence of the triangle heating on the outer surface of the face plate. If the outer edge of the panel away from the root bends and deforms away from the root, the outer surface of the panel is first heated in intervals of triangles. The triangles are isosceles triangles, and the base of each triangle is set along the outer edge of the panel. The heating sequence is from the part closest to the root to the outside of the panel. The height of the triangle is 2b / 3. The triangle heating is completed by multiple strip heating. After heating the outer surface of the panel, triangle heating is performed on the inner surface of the panel at the position corresponding to the triangle heating of the outer panel. The heating sequence of the triangle heating on the inner surface of the panel is the same as the sequence of the triangle heating on the outer surface of the panel.

4. The method for straightening marine TA3 titanium alloy plates according to claim 3, characterized in that, The distance between the midlines of the triangles is 750-850mm, and the length of the base of the triangle is half the height of the triangle; after the strip heating is completed, water cooling is performed immediately, and after the triangle heating is completed, the triangular area is water cooled.

5. The method for straightening marine TA3 titanium alloy plates according to claim 1, characterized in that, Step S3 specifically includes the following steps: S301. The sheet metal is placed horizontally, and the spherical flattened titanium is fixed to the lower surface of the sheet metal. If the lower ends of the spherical flattened titanium are of uniform height, the sheet metal heights between the spherical flattened titanium are inconsistent, and there is a concave surface between the spherical flattened titanium, then the sheet metal is deformed into a "lean horse" shape. If the lower ends of the spherical flattened titanium are inconsistent, the sheet metal heights between the spherical flattened titanium are inconsistent, and there is one of a convex or concave surface between the spherical flattened titanium, then the sheet metal is deformed into an "undulating wave" shape. If the lower ends of the spherical flattened titanium are inconsistent, and there are both convex and concave surfaces between the spherical flattened titanium, then the sheet metal is deformed into a "concave-convex" shape. S302. Determine the type of deformation in the middle area of ​​board 2. If the board is deformed into a "lean horse" shape, proceed to S303; if the board is deformed into an "undulating wave" shape, proceed to S304; if the board is deformed into an "uneven" shape, proceed to S305. S303. Use a long strip heating method to heat the upper surface of the plate at the position corresponding to the location of the spherical flat titanium 1; S304. Heat the position of the spherical flat titanium on both sides of the concave surface on the upper surface of the plate using a long strip heating method, and then heat the intersection of the concave surface after correction and the convex surface on the upper surface of the plate using a long strip heating method. S305. Use a long strip heating method to heat the upper surface of the plate at the position corresponding to the spherical flat titanium. Then, use a heating method to correct the deformation at the intersection of the concave and convex surfaces between adjacent spherical flat titanium on the upper surface of the plate. If the deformation still exists, use a heating method to correct the deformation at the convex surface between adjacent spherical flat titanium on the upper surface of the plate.

6. The method for straightening marine TA3 titanium alloy plates according to claim 1, characterized in that, Step S4 specifically includes the following steps: With the side of the plate with the flattened titanium ball facing upwards, fix the free edge of the plate to be corrected to the steel frame using a caliper. Use a heating method to correct the uneven area formed by the concave or convex surface of the free edge, with the heating point gradually moving from the inside of the plate towards the free edge.

7. The method for straightening marine TA3 titanium alloy plates according to claim 1, characterized in that, Step S5 specifically includes the following steps: If the opening on the board is circular, a wedge heating method is used to correct the periphery of the circular opening. The bottom edge of the wedge is located at the rounded edge of the circular opening. The wedge around the circular opening is symmetrical about the center, and the central axis of the wedge is set along the radial direction of the circular opening. When wedge heating the periphery of the circular opening, the heating sequence is symmetrical about the center, and the wedge heating path is from the outside of the circular opening towards the circular opening. If the opening on the board is rectangular, a wedge heating method is used to correct the periphery of the rectangular opening. The bottom edge of the wedge is located at the rounded corner of the rectangular opening, and the central axis of the wedge is set along the diagonal of the rectangular opening. When wedge heating the periphery of the rectangular opening, the heating sequence is in the same direction along the transverse or longitudinal direction of the board, and the wedge heating path is from the outside of the rectangular opening towards the rectangular opening.

8. The method for straightening marine TA3 titanium alloy plates according to claim 1, characterized in that, Step S6 specifically includes the following steps: If the welded plate is convex upwards as a whole, and the weld is located on the curved ridge of the convex surface, and there is deformation on both sides of the weld, then the curved surface is straightened by heating with short strips on both sides of the weld, with the heating line parallel to the weld. If the plate on both sides of the weld is convex upwards respectively, and the weld is located on the curved ridge where the two convex surfaces intersect, then the curved surface is straightened by heating with long strips on both sides of the weld, with the heating line perpendicular to the weld.

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