Preparation method of dissimilar metal connecting material for ship engineering

Abstract

The invention relates to the technical field of dissimilar metal composite material manufacturing, in particular to a preparation method of a dissimilar metal connecting material for ship engineering, which comprises the following steps: S1, sequentially placing an isolation support plate, a first support block and a base plate on an explosion foundation; s2, sealing along the peripheries of the substrate and the isolation support plate by using a sealing material; s3, a second supporting block of the metal net frame is placed on the surface of the base plate; s4, the compound plate is placed on a second supporting block; s5, explosive is laid on the upper surface of the compound plate; s6, water is injected from a water injection opening; s7, inserting a detonator into the explosive; and S8, detonating the detonator and detonating the explosive to form the explosive welding material. Through the cylindrical mesh-shaped supporting piece and overwater explosive welding, the production length of a product is increased, the shearing performance of a far-end interface is greatly improved, the influence of interface performance of different areas caused by non-uniform basic virtuality and reality is reduced, and the problems of poor long-distance combination and consistency of performance of all the areas of the product in explosive welding are solved.

Description

Technical Field

[0001] The invention relates to the technical field of manufacturing dissimilar metal composite materials, and in particular to a method for preparing a dissimilar metal connecting material for ship engineering. Background Art

[0002] Titanium alloys are increasingly attracting attention from ships and marine engineering equipment due to their excellent properties, such as high specific strength, low density, and excellent corrosion resistance, and are known as "marine metals". The application of titanium alloys can significantly reduce the structural weight of ships and achieve high maneuverability. With the development of ship equipment, the application scope of titanium alloys in the ship field will continue to expand in the future.

[0003] In order to solve the problem of high-strength connection between dissimilar metals of titanium alloy superstructure and steel deck, titanium-steel composite material made by explosive welding technology is used, and then conventional welding method is used to achieve reliable connection between titanium superstructure and steel main hull. Figure 1 .

[0004] However, there are currently the following problems in titanium steel composite materials for ships: First, the high and long distance bonding is poor; at present, the length of titanium steel composite materials used in domestic ships is generally not more than 2000mm, mainly because the metal jet and air need to move during the explosion process, and the support parts are needed during the assembly to keep a certain distance between the titanium plate and the steel plate, such as Figure 2 The support is generally made of copper, stainless steel, aluminum or other metals, and is generally V-shaped or hollow cylindrical. Figure 3 and Figure 4 As shown, both types of shapes have a certain obstruction effect on the metal jet and the air, resulting in low bonding strength in the support area, which affects the stability of the propagation of the metal jet and the air. As the propagation distance increases, the impact becomes more serious, thereby restricting the production of longer products.

[0005] The performance of different areas of titanium-steel composite materials fluctuates greatly. During the existing explosive welding, the base steel plate is laid on a sand foundation, which makes it difficult to ensure that the steel plate fits tightly against the sand foundation. During explosive welding, a large explosion stress wave is emitted from the suspended part to damage the interface performance, which in turn results in large performance fluctuations in different areas. It is difficult to meet the ship's requirements for consistency in performance of different areas of titanium-steel composite materials.

[0006] Publication number: CN101837511B The explosive welding method of SAF2507 alloy composite steel plate includes the following steps: substrate processing: leveling, the unevenness of the steel plate is less than 3mm / m; composite material processing: ensure that the surface unevenness of the SAF2507 alloy plate is less than 5mm / m; brushing and matching: brushing the SAF2507 alloy plate with composite material protective agent, and then matching it with the steel plate; explosive compounding: placing the steel plate flat on the explosion table, the SAF2507 alloy plate is placed on it in parallel, a "V"-shaped support is placed in the middle, and explosives are evenly placed on the outer surface of the SAF2507 alloy plate, detonated by a detonator, and under high braking pressure, the surface of the SAF2507 alloy plate and the steel plate are firmly bonded together. This solution adopts the existing V-shaped support and explosion table, which cannot solve the problems of poor bonding at high distances and large performance fluctuations in different areas.

[0007] Therefore, it is urgent to propose a new method for preparing dissimilar metal connection materials to solve the problems of poor long-distance bonding and large performance fluctuations in different regions existing in the prior art. Summary of the invention

[0008] In view of this, the present invention aims to propose a method for preparing dissimilar metal connection materials for ship engineering, so as to solve the problems existing in the prior art of poor high-distance bonding and large fluctuations in performance in different regions.

[0009] Due to the bottleneck of the existing technical solutions, the use of "V-shaped" or "hollow cylindrical" non-porous supports not only hinders the flow of air and metal jets, but also has a large weight and a large diffusion area when melted, which has a secondary impact on the metal jet and air. Because a large number of supports need to be placed to explosively weld a composite material, each support will have a certain impact, such as Figure 6 As shown in the figure, as the explosion length increases, the influence of the support parts is superimposed, so that the support parts at the far end have a more obvious impact. Explosion welding has the problem of poor bonding at high distances. At present, the application length of titanium steel composite materials is generally 2000mm, and the product length is short. In order to meet the requirements of the total length of the ship, multiple pieces of materials need to be connected to each other, such as Figure 5 As shown. This not only increases the welding workload, but also makes the welding of the connection points difficult and demanding, which increases the difficulty of on-site construction and the butt welds of titanium-steel composite materials. Under the condition of a certain total length of ship construction, the number of butt welds produced by using 6000mm titanium-steel composite materials will be reduced by nearly 50% compared to 2000mm specifications, and the corresponding construction efficiency will be further improved. At the same time, when butt welding titanium-steel composite materials, there is a hidden danger that the welding penetration reaches the titanium-steel composite interface, thereby reducing the performance strength of the titanium-steel composite material. Therefore, the shorter the length of the titanium-steel composite material, the more butt welds there are, thereby increasing the risk of hidden dangers of welding penetration reaching the titanium-steel composite interface.

[0010] In addition, titanium steel composite materials are key materials for ships, and have high requirements for the consistency of performance in different regions. Titanium steel composite materials are key materials for the reliable connection between the titanium superstructure and the steel main hull of ships, and are under dynamic fatigue loads for a long time. If the local performance is low, it is easy to form a crack source, and macro cracks will gradually form under the action of cyclic loads. Therefore, this field has high requirements for the consistency of performance in various regions of titanium steel composite materials.

[0011] The present application creatively adopts a mesh-like support member because its own mesh holes can reduce the resistance of the metal jet and air flow, and the mesh-like support member has a low mass per unit volume and a small diffusion area during melting, thereby avoiding the superposition of the influence effects of the support member as the explosion length increases; a certain amount of water is injected into the bottom of the substrate to ensure the consistency of the medium at the bottom of the substrate, and the incompressibility of water is utilized to reduce the impact of the interface performance of different regions caused by the unevenness of the foundation, thereby improving the consistency of the performance of each region of the product, and reducing the coefficient of variation of the performance of each region from the traditional 10% to 5%.

[0012] The technical solution of the present invention is achieved in this way: The present invention discloses a method for preparing a dissimilar metal connection material for ship engineering, which specifically comprises the following steps: S1: placing an isolation support plate on the explosion foundation, then placing a first support block on the isolation support plate, and placing a substrate on the first support block, ensuring that there is a gap around the substrate and the isolation support plate; S2: using sealing materials to seal around the contact areas between the substrate and the isolation support plate, and reserving a water injection port; S3: placing a second support block on a surface of the substrate away from the isolation support plate, wherein the second support block is a metal grid having regularly arranged holes; S4: placing the doubler plate on the second supporting block; S5: Evenly laying explosives on the upper surface of the double plate; S6: slowly inject water from the water injection port, and after the water is filled, plug the water injection port and seal it; S7: inserting a detonator into the explosive; S8: detonating the detonator and the explosive to form an integrated explosive welding material.

[0013] Furthermore, in step S1, the thickness of the isolation support plate is 10-20 mm, and the length and width of the isolation support plate are both 200-400 mm larger than the substrate.

[0014] Furthermore, the isolation support plate can be one of gypsum board, wood fiberboard, high-density polyethylene board, cement limit plate, aluminum alloy board, plastic support composite board, and steel plate.

[0015] Furthermore, in step S1, the material of the first support block is a wooden block, and the height of the first support block is 5-20 mm.

[0016] Further, in step S1, the material of the substrate is L907A or 945 steel, the thickness of the substrate is 6-30 mm, the length of the substrate is not more than 7000 mm, and the width of the substrate is not more than 2500 mm.

[0017] Furthermore, in step S2, the sealing material is industrial waterproof glue.

[0018] Furthermore, in step S3, the second support block 7 is a copper mesh hollow cylinder, and the height of the second support block 7 is 5-20 mm.

[0019] Further, in step S4, the material of the doubler plate is TA1, the thickness of the doubler plate is 3-20 mm, the length of the doubler plate is not more than 7000 mm, and the width of the doubler plate is not more than 2500 mm.

[0020] Furthermore, in step S5, the explosive is a mixed powdered explosive with powdered emulsion as the main agent and mineral powder added, and the detonation velocity of the explosive is controlled within the range of 1800-2500 m / s.

[0021] Further, in step S7, the detonator is arranged in the middle of the double plate.

[0022] Compared with the prior art, the method for preparing a dissimilar metal connection material for ship engineering of the present invention has the following advantages: The present invention adopts cylindrical mesh support members to replace "V-shaped" and "hollow cylindrical" non-porous support members, thereby reducing the flow resistance of air and metal jets, improving the flow stability, increasing the product production length, and effectively improving the impact of each support member. The product length is extended from the existing 2000mm to 6000mm, greatly improving the far-end interface shear performance, solving the problem of poor high-distance bonding in explosive welding, and improving shipbuilding efficiency and product quality.

[0023] The present invention ensures the consistency of the medium at the bottom of the substrate by injecting a certain amount of water at the bottom of the substrate, utilizes the incompressibility of water, reduces the influence of interface performance of different regions caused by uneven foundation, improves the consistency of performance of various regions of the product, and reduces the coefficient of variation of performance of each region from the traditional 10% to 5%.

[0024] The present invention increases the length of the titanium steel composite material from 2000mm to 6000mm, and the butt weld of the titanium steel composite material is reduced by 60%. The production length of the titanium steel composite material is increased from 2000mm to 6000mm. Under the condition of a certain total length of ship construction, the number of butt welds generated by using the 6000mm specification titanium steel composite material will be reduced by nearly 50% compared with the 2000mm specification, and the corresponding construction efficiency is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic diagram of the engineering application of titanium steel composite materials; Figure 2 This is a schematic diagram of the explosion welding process; Figure 3 This is a diagram of an existing V-shaped support; Figure 4 This is a diagram of an existing hollow cylindrical support; Figure 5 This is a schematic diagram of butt welding of titanium steel composite materials; Figure 6 This is a schematic diagram of the placement of support parts; Figure 7 This is a schematic diagram of the explosion welding structure of the present invention; Figure 8 It is a top view of the explosion welding structure of the present invention; Fig. 9 It is a schematic diagram of the structure of the second support block of the present invention.

[0026] Description of reference numerals: 1. Explosion foundation; 2. Isolation support plate; 3. First support block; 4. Base plate; 5. Sealing material; 6. Water injection port; 7. Second support block; 701, Edge sealing; 8. Composite plate; 9. Explosives; 10. Detonator; 11. Steel deck; 12. Titanium alloy superstructure; 13. Weld. DETAILED DESCRIPTION

[0027] In order to make the technical means, objectives and effects of the present invention easy to understand, the embodiments of the present invention are described in detail below with reference to specific drawings.

[0028] It should be noted that all the terms used in the present invention to indicate directionality and position, such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside", "top", "lower", "lateral", "longitudinal", "center", etc., are only used to explain the relative positional relationship and connection status between the components in a certain state, and are only for the convenience of describing the present invention, rather than requiring the present invention to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0031] In the existing shipbuilding technology, the high-strength connection of dissimilar metals between the titanium alloy superstructure 12 and the steel deck 11 is achieved by using a titanium-steel composite material made by explosion welding technology, and then a reliable connection between the titanium alloy superstructure 12 and the steel deck 11 is achieved by conventional welding methods. Conventionally, a thinner titanium plate is used as a composite plate 8, and a thicker steel plate is used as a base plate 4. After explosion welding, a titanium-steel composite material is formed. When the ship is built, the titanium alloy superstructure 12 is connected to the composite plate 8, and the steel deck 11 is connected to the base plate 4. Figure 1 shown.

[0032] "Poor bonding at high and long distances" usually refers to the problem of poor bonding quality of the welding interface between the composite plate and the base plate, especially in the area far away from the detonation point of the explosive, that is, the high and long distance area. In explosive welding, the use of "V-shaped" or "hollow cylindrical" non-porous supports will hinder the flow of air and metal jets. Since more supports are needed to explosively weld a composite material, each support will have a certain impact. As the explosion length increases, the impact of the supports will be superimposed, such as Figure 2 , Figure 3 , Figure 4 and Figure 6 shown.

[0033] like Figure 7 and Figure 8 As shown, one purpose of the present invention is to disclose a method for preparing a dissimilar metal connecting material for ship engineering, which specifically comprises the following steps: S1: Place an isolation support plate 2 on the explosion foundation 1, then place a first support block 3 on the isolation support plate 2, and place a base plate 4 on the first support block 3, ensuring that an appropriate gap is maintained around the base plate 4 and the isolation support plate 2; The isolation support plate 2 serves as a base, providing a flat and stable surface for the placement of subsequent components. The first support block 3 ensures an appropriate gap between the substrate 4 and the isolation support plate 2, so that a sufficient collision angle can be formed during the explosion welding process, thereby achieving good metallurgical bonding. The gap should be set according to specific process requirements.

[0034] S2: Use sealing material 5 to seal around the contact area between the substrate 4 and the isolation support plate 2, and reserve a water injection port 6; The use of sealing material 5 for sealing can prevent leakage when water is injected and maintain the consistency and stability of the internal environment. The reserved water injection port 6 provides a channel for water medium filling in subsequent steps.

[0035] S3: A second support block 7 is placed on the surface of the substrate 4 away from the isolation support plate 2. The second support block 7 is a metal grid with regularly arranged holes; The second support block 7 not only supports the composite plate 8, but also its regularly arranged hole design allows air and metal jet to pass smoothly, reducing the obstruction to the propagation of explosion energy.

[0036] S4: placing the doubler plate 8 on the second support block 7; The composite plate 8 is carefully placed on the second support block 7 to ensure that its position is accurate and a predetermined gap is maintained between the composite plate 8 and the base plate 4. During explosion welding, the composite plate 8 can directly contact the base steel plate to form a key layer of the composite material.

[0037] S5: Evenly lay explosives 9 on the upper surface of the double plate 8; A layer of explosives 9 is evenly laid on the upper surface of the composite plate 8 to ensure that the explosives 9 are evenly distributed so as to generate a consistent shock wave when detonated, thereby achieving an ideal explosive welding effect.

[0038] S6: slowly inject water from the water injection port 6, and after the water is filled, plug the water injection port 6 and seal it; An appropriate amount of water is slowly injected through the reserved water injection port 6 until the water level reaches a predetermined height or completely fills the sealed space. After the water injection is completed, the water injection port 6 is immediately plugged and strictly sealed. The injected water acts as an incompressible medium, which ensures the consistency of the medium at the bottom of the substrate 4 and reduces the impact of the interface performance of different areas.

[0039] S7: inserting the detonator 10 into the explosive 9; The detonator 10 is a detonating device responsible for detonating the explosive 9 and starting the explosive welding process. Under safe conditions, the detonator 10 is inserted into a preset position and the connection of the detonator 10 is ensured to be firm and reliable to avoid potential safety hazards caused by looseness. S8: detonating the detonator 10 and detonating the explosive 9 to form an integrated explosive welding material.

[0040] After completing all the preparations, under the premise of ensuring safety, the detonator 10 is detonated by remote control or other safe means to detonate the explosive 9. The detonation of the explosive 9 generates a high-voltage pulse load, which accelerates the composite titanium layer downward and collides with the middle layer titanium and the base steel, and finally achieves metallurgical bonding, so that the composite plate 8 and the base plate 4 are formed into an integrated structure through explosion welding.

[0041] The second support block 7 adopts a metal grid design with regularly arranged holes, which can provide stable support for the composite plate 8 to ensure that it maintains the correct relative position during the explosion. At the same time, the mesh support can reduce the resistance of the metal jet and air flow due to its own mesh. Moreover, the unit volume mass of this type of support is low, and the diffusion area during melting is small, which avoids the obstruction of the flow of air and metal jets due to the "V-shaped" or "hollow cylindrical" non-porous support. In addition, the support is heavy and has a large diffusion area during melting, which has a secondary impact on the metal jet and air. Since a composite material needs to be explosively welded, more support parts need to be placed, and each support part will have a certain impact, such as Figure 6 As the explosion length increases, the influence effect of the non-porous support parts is superimposed, so that the support parts at the far end have a more obvious impact, resulting in the length of existing products generally being 2000mm. This application uses mesh-shaped support parts to effectively improve the influence of each support part, improve the shear performance of the far-end interface, and make the product length up to 6000mm.

[0042] During explosion welding, water is incompressible. A certain amount of water is injected through the bottom of the substrate 4 to ensure the consistency of the medium at the bottom of the substrate 4, reduce the impact of the unevenness of the foundation on the interface performance of different regions, and improve the consistency of the performance of each region of the product. The coefficient of variation of the performance of each region is reduced from the traditional 10% to 5%.

[0043] This setting significantly improves the quality and efficiency of explosive welding by introducing a metal grid with regularly arranged holes as a support, using water as a buffer and optimizing the overall assembly process. It solves the problems of limited length and inconsistent performance in existing technologies and improves the application reliability and construction efficiency of titanium-steel composite materials.

[0044] In addition, this method simplifies the process, reduces operational complexity and cost, and enhances safety and environmental protection.

[0045] Specifically, in step S1, the blasting foundation 1 is a sandy floor.

[0046] As a loose medium, sand can quickly absorb and disperse a large amount of energy at the moment of explosion, reducing the impact on the surrounding environment. The sandy floor after the explosion is easier to restore to its original state through simple leveling and compaction, which is convenient for subsequent operations and cleaning. Moreover, sand is a natural material and will not cause pollution to the soil and groundwater, and it meets environmental protection standards.

[0047] Specifically, in step S1 , the thickness of the isolation support plate 2 is 10-20 mm, and the length and width of the isolation support plate 2 are both 200-400 mm greater than the substrate 4 .

[0048] According to different processing requirements, an isolation support plate 2 of appropriate thickness is selected to avoid unnecessary waste. The isolation support plate 2 as a base provides a flat and stable surface to ensure that subsequent components such as support blocks, substrates 4, etc. can be accurately placed and water can be contained, thereby avoiding water loss and reducing assembly errors. The length and width of the isolation support plate 2 are both 200-400mm larger than the substrate 4, ensuring that there is enough space around for sealing, and reserving operating space for workers to operate and inspect. The existence of the isolation support plate 2 provides a closed space for the water injection process, so that the water medium can be evenly distributed at the bottom of the entire welding area, thereby enhancing the transmission efficiency of the explosion energy.

[0049] Specifically, the isolation support plate 2 can be one of gypsum board, wood fiberboard, high-density polyethylene board, cement limit plate, aluminum alloy board, plastic support composite board, and steel plate.

[0050] This setting can select a suitable material for the isolation support plate 2 according to actual processing requirements and cost issues, which can meet special performance requirements, improve operational convenience, and ensure welding effects.

[0051] Specifically, in step S1, the material of the first support block 3 is a wooden block, and the height of the first support block 3 is 5-20 mm.

[0052] The first support block 3 ensures that there is an appropriate gap of 5-20mm between the substrate 4 and the isolation support plate 2, which helps to form the correct collision angle during the explosion welding process, thereby achieving good metallurgical bonding. The wooden block as a support block can be cut into a precise height as needed, which is convenient for adjustment according to specific process requirements, ensuring the height of each support point is consistent, improving assembly accuracy, and providing a relatively uniform and stable support surface to ensure that the substrate 4 remains horizontal on the entire surface, reducing assembly errors caused by unevenness. Moreover, the wooden block will not adhere to the metal surface, avoiding the problem of difficult cleaning after the explosion, and simplifying the subsequent processing steps.

[0053] The setup is low-cost, lightweight, easy to operate, environmentally friendly, and easy to dispose of or recycle after use, meeting modern environmental requirements. It does not present the risk of corrosion that some metal supports do, especially in humid environments, thus avoiding maintenance issues during long-term use.

[0054] Preferably, the length and width of the first support block 3 are 30×30 mm.

[0055] Specifically, in step S1, the material of the substrate 4 is L907A or 945 steel, the thickness of the substrate 4 is 6-30 mm, the length of the substrate 4 is not more than 7000 mm, and the width of the substrate 4 is not more than 2500 mm.

[0056] The substrate 4 is the key part of the entire composite material structure, serving as the base layer for explosive welding, carrying the composite plate 8 and ensuring a good metallurgical bond between the two. The selection of L907A and 945 steel can select the most suitable material according to specific application requirements to meet different mechanical properties, corrosion resistance and processing requirements. The size of the substrate 4 limits the effective area of ​​explosive welding, ensuring that the energy is concentrated on the part that needs to be welded, reducing the influence of edge effects, and ensuring the quality of explosive welding.

[0057] This setting uses a base plate 4 made of L907A or 945 steel, with a thickness of 6-30mm, a length of no more than 7000mm, and a width of no more than 2500mm. It not only provides a stable and high-performance foundation for explosive welding, but also brings many advantages in practical applications. By precisely controlling material selection, thickness setting and size restrictions, it ensures the safety and efficiency of the welding process, while optimizing welding quality and production efficiency.

[0058] Specifically, in step S1 , the gap between the substrate 4 and the isolation support plate 2 is in the range of 100-200 mm.

[0059] The gap range is set between 100-200mm, which provides necessary operating space for subsequent sealing, water injection and explosion welding. For example, the reserved space allows workers to easily apply adhesives and ensure and facilitate the inspection of the sealing effect; it can ensure that sufficient water is injected between the substrate 4 and the isolation support plate 2 after sealing, ensure the consistency of the medium at the bottom of the substrate 4, and reduce the impact of the unevenness of the foundation on the interface performance of different regions.

[0060] Specifically, in step S2, the sealing material 5 is industrial waterproof glue.

[0061] Industrial waterproof glue is used to seal the surrounding areas where the substrate 4 contacts the isolation support plate 2, ensuring that the entire device forms a closed space to prevent water and other impurities from entering, and can also effectively prevent water from leaking from the gaps to ensure that the water medium is evenly distributed at the bottom of the entire welding area. During the explosion welding process, the waterproof glue can temporarily fix the position of the substrate 4 to prevent it from being displaced due to external factors, such as transportation and assembly, thereby affecting the final welding effect.

[0062] Most industrial waterproof adhesives in this setting have good thixotropy and spreadability, which makes it easy for construction workers to apply it evenly and easy to adjust the position before it is fully cured. It is also convenient to clean tools and equipment. Modern industrial waterproof adhesives often use environmentally friendly formulas, do not contain substances harmful to the human body, meet strict environmental protection standards, and ensure the health and safety of operators. Compared with other types of sealing materials 5, industrial waterproof adhesives have lower costs but superior performance, provide higher cost performance, and reduce overall construction costs.

[0063] Specifically, in step S3, the second support block 7 is a copper mesh hollow cylinder, and the height of the second support block 7 is 5-20 mm.

[0064] The second support block 7 ensures that an appropriate gap of 5-20 mm is maintained between the composite plate 8 and the substrate 4, so that a correct collision angle can be formed during the explosion welding process, thereby achieving good metallurgical bonding. The design of the hollow cylinder allows air and metal jets to pass smoothly, reducing obstacles to the propagation of explosion energy and improving the shear performance of the distal interface. The copper material has certain elasticity and buffering properties, which can absorb part of the impact energy during the explosion, reduce direct damage to the composite plate 8 and the substrate 4, and protect the components from excessive pressure.

[0065] This setup ensures a safe and efficient welding process through precise height setting and hollow design, while optimizing welding quality and production efficiency.

[0066] Preferably, Fig. 9 As shown, edge sealing 701 is provided at both ends of the second supporting block 7 .

[0067] The edge sealing 701 increases the structural rigidity of the second support block 7, can ensure the contact area between the second support block 7 and the substrate 4, and between the second support block 7 and the composite plate 8, ensure the supporting effect, improve the stability of the overall structure, and avoid the mesh structure of the second support block 7 scratching the surface of the substrate 4 or the composite plate 8, affecting the quality of explosion welding.

[0068] Specifically, in step S4, the material of the doubler plate 8 is TA1, the thickness of the doubler plate 8 is 3-20 mm, the length of the doubler plate 8 is not greater than 7000 mm, and the width of the doubler plate 8 is not greater than 2500 mm.

[0069] As a titanium alloy TA1 material, the composite plate 8 provides high strength and low density characteristics and has extremely high corrosion resistance, especially in harsh environments such as seawater. It performs well and extends the service life of the material. It is suitable for ship superstructures and can significantly reduce the weight of the hull, improve maneuverability and fuel efficiency. The composite plate 8 and the base plate 4 are metallurgically bonded by explosion welding, which ensures a reliable connection between the two and enhances the overall performance of the composite material.

[0070] The larger size of the setting, 7000mm long and 2500mm wide, enables the composite material product generated by explosion welding to support the production of longer titanium steel composite materials, reduces the number of butt welds 13, and improves the overall performance of the product. The production length of the titanium steel composite material is increased from 2000mm to 6000mm. Under the condition of a certain total length of ship construction, the butt weld 13 generated by the titanium steel composite material of 6000mm specification is less than that of the titanium steel composite material of 2000mm specification. Figure 5 As shown, the number will be reduced by nearly 50%, and the corresponding construction efficiency will be further improved.

[0071] Specifically, in step S5, the explosive 9 is a mixed powdered explosive with powdered emulsion as the main agent and an appropriate amount of mineral powder added, and its detonation velocity is controlled within the range of 1800-2500 m / s.

[0072] Emulsion Explosive in Powder Form is a mixture of emulsifier, oxidant aqueous solution and combustibles, which is processed by special process to form powdered high-energy explosive. It combines the advantages of traditional emulsion explosives and powdered explosives, and has higher explosive performance and good physical properties.

[0073] The mixture of powdered emulsion explosive and mineral powder can provide stable and predictable explosive energy output, ensuring the same effect of each explosive welding. Controlling the detonation speed within the range of 1800~2500m / s can ensure that the shock wave generated by the explosion can transmit energy within a suitable range, neither causing excessive damage due to too fast speed nor affecting the welding effect due to too slow speed. By adjusting the ratio of the main agent and the additive, the distribution of the explosive energy can be optimized, so that the energy acts more evenly on the interface between the composite plate 8 and the base plate 4, improving the welding quality. Plates of different thicknesses and shapes require different energy densities for effective welding. By controlling the detonation speed and the explosive 9 formula, it can better adapt to the welding needs under various complex working conditions.

[0074] This setting uses a mixed powdered explosive with powdered emulsion explosive as the main agent and an appropriate amount of mineral powder added, and controls the detonation speed within the range of 1800~2500m / s. It not only provides a stable and controllable energy source for explosive welding, but also ensures the safety and reliability of the welding process, while optimizing the welding quality and improving production efficiency and economic benefits.

[0075] Specifically, the thickness H of the explosive 9 is 40-100 mm.

[0076] By setting the thickness of the explosive 9, the intensity of the explosion can be accurately controlled to avoid welding defects caused by excessive or weak energy, such as excessive damage or poor bonding. A 40-100mm layer of explosive 9 can provide sufficient explosion energy to ensure that the shock wave generated during the explosion welding process is strong enough to achieve good metallurgical bonding between the base plate 4 and the composite plate 8. The appropriate thickness of the explosive 9 helps to ensure that the shock wave generated by the explosion is evenly distributed on the entire welding surface, reduce local stress concentration, and improve the consistency of the welding interface.

[0077] This arrangement can release a large amount of energy in a relatively small volume, and can ensure that the intensity of the shock wave generated during the explosion welding process is moderate, which will neither cause excessive damage to the base plate 4 and the composite plate 8, nor can it achieve good metallurgical bonding, thereby improving the welding quality and helping to ensure the welding effect.

[0078] Specifically, the detonator 10 is an industrial No. 8 electronic detonator.

[0079] Industrial No. 8 electronic detonator can provide precise detonation control to ensure that the explosive 9 in the explosive welding process can be accurately detonated at the predetermined time and position, thereby achieving the ideal welding effect. The electronic detonator supports the remote detonation system, and the operator can perform the detonation operation through the electronic equipment at a safe distance, which greatly improves the safety of the operation.

[0080] This setting provides higher detonation accuracy and reliability, ensuring that each detonation can achieve the expected effect, reducing the risks and losses caused by detonation failure, and operators do not need to approach dangerous areas, reducing the risk of personal injury, reducing the cumbersome steps required for traditional detonators 10, improving construction efficiency, and having higher economic benefits.

[0081] Specifically, the detonator 10 is arranged in the middle of the double plate 8 .

[0082] Placing the detonator 10 in the middle of the composite plate 8 can ensure that the explosion energy is evenly transferred from the center to the outside, so that the entire welding area is subjected to relatively consistent energy impact, thereby improving the consistency and quality of the welding interface, reducing the impact of edge effects, and making the performance of the three areas of the distal end, middle section and proximal end more consistent, thereby improving the overall welding quality.

[0083] Specifically, it also includes step S9, performing ultrasonic testing after the explosion, the interface composite rate reaches 100%, and performing performance tests on the three regions of the distal end, the middle section, and the proximal end. The shear strength is greater than 210 MPa, and the coefficient of variation does not exceed 5%.

[0084] The quality of the welding interface is confirmed by non-destructive testing to ensure that there are no unbonded or defective areas. The interface recombination rate of 100% indicates that complete metallurgical bonding is achieved during the explosion welding process, and all contact surfaces have achieved an ideal bonding effect. The overall mechanical properties of the welding interface are evaluated by testing the shear strength of different areas, the distal end, the middle section, and the proximal end, reflecting its load-bearing capacity, ensuring the uniformity and reliability of the entire welding interface, and reducing local weak links. The coefficient of variation does not exceed 5%, which measures the consistency of performance between different areas. The lower coefficient of variation indicates that the performance fluctuations in each area are small and the welding quality is stable.

[0085] The set test method and test standard help to prove that the method has good process stability, can maintain high quality standards in large-scale production, and can be applied to actual production, helping to ensure consistency in large-scale production and quality control. Example 1

[0086] A method for preparing a dissimilar metal connecting material for ship engineering.

[0087] like Figure 1 As shown: the base plate 4 is made of 945 steel, the composite plate 8 is made of TA1, the material size of the composite plate 8 is 6×1550×6250mm, the base plate 4 is 16×1500×6200mm, the isolation support plate 2 is a gypsum board, and the first support block 3 is a wooden block. The specific preparation method is as follows: S1: Place an isolation support plate 2 with a thickness of 10mm, a width of 1900mm, and a length of 6600mm on the explosion foundation 1, and then place a first support block 3 with a height of 8mm and a length and width of 30×30mm on the isolation support plate 2, and place 945 steel on top of it. The distance between the steel plate and the isolation support plate 2 is controlled at 100-200mm.

[0088] S2: The sealing material 5 is made of industrial waterproof glue, and is sealed along the four sides where the base plate 4 steel plate contacts the isolation support plate 2, and a water injection port 6 is reserved.

[0089] S3: The second support block 7 is placed on the surface of 945 steel. The second support block 7 is a copper mesh hollow cylindrical support with a height of 8 mm. S4: Add another 6mm layer of composite material TA1.

[0090] S5: Explosives 9 with a thickness of H=40mm are evenly laid on the upper surface of the 6mm composite material TA1. The explosives 9 are mixed powdered explosives with powdered emulsion as the main agent and an appropriate amount of mineral powder added, and the detonation velocity is controlled within the range of 1800~2500m / s.

[0091] S6: Slowly inject water from the water injection port 6, and plug and seal the water injection port 6 after it is full.

[0092] S7: Finally, insert detonator 10, which is an industrial No. 8 electronic detonator.

[0093] S8: detonating cap 10, detonating explosive 9, causing 6mm composite material TA1 to collide with base material 945 steel, forming an integrated explosive welding material.

[0094] Ultrasonic testing was carried out after the explosion, and the interface composite rate reached 100%. Performance tests were carried out in the distal, middle and proximal regions. The average shear strength was 251 MPa and the coefficient of variation was 4.8%. Example 2

[0095] like Figure 1 As shown: the base plate 4 is made of L907A steel, the composite plate 8 is made of TA1, the material size of the composite plate 8 is 6×2050×6250mm, the base plate 4 is 16×2000×6200mm, and the first support block 3 is a wooden block with a length and width of 30×30mm.

[0096] S1: Place a gypsum board with a thickness of 10mm, a width of 2400mm and a length of 6600mm on the explosion foundation 1, and then place a wooden block with a height of 8mm and a length and width of 30×30mm on the gypsum board, and place L907A steel on top of it. The distance between the steel plate and the gypsum board is controlled at 100-200mm.

[0097] S2: The sealing material 5 is made of industrial waterproof glue, which is sealed along the four sides where the steel plate and the gypsum board are in contact, and a water injection port 6 is reserved.

[0098] S3: A copper mesh hollow cylindrical second support block 7 is placed on the surface of L907A steel, with a height of 8 mm. S4: Add another 6mm layer of composite material TA1.

[0099] S5: Explosives 9 with a thickness of H=40mm are evenly laid on the upper surface of the 6mm composite plate 8 material TA1. The explosives 9 are mixed powdered explosives with powdered emulsion as the main agent and an appropriate amount of mineral powder added, and the detonation velocity is controlled within the range of 1800~2500m / s.

[0100] S6: Slowly inject water from the water injection port 6, and plug and seal the water injection port 6 after it is full.

[0101] S7: Finally, insert detonator 10, which is an industrial No. 8 electronic detonator.

[0102] S8: detonating cap 10, detonating explosive 9, causing 6mm composite plate 8 material TA1 to collide with base plate 4 material L907A, forming an integrated explosive welding material.

[0103] Ultrasonic testing was carried out after the explosion, and the interface composite rate reached 100%. Performance tests were carried out in the distal, middle and proximal regions. The average shear strength was 265MPa and the coefficient of variation was 4.6%.

[0104] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a dissimilar metal connecting material for shipbuilding engineering, characterized in that: The specific steps include: S1: placing an isolation support plate (2) on the explosion foundation (1), then placing a first support block (3) above the isolation support plate (2), and placing a base plate (4) above the first support block (3), ensuring that a gap is left around the base plate (4) and the isolation support plate (2); S2: using a sealing material (5) to seal around the contact areas between the base plate (4) and the isolation support plate (2), and reserving a water injection port (6); S3: a second support block (7) is placed on a surface of the substrate (4) away from the isolation support plate (2), wherein the second support block (7) is a metal grid having regularly arranged holes; S4: placing the doubler plate (8) on the second supporting block (7); S5: Evenly laying explosives (9) on the upper surface of the double plate (8); S6: slowly injecting water from the water injection port (6), and plugging and sealing the water injection port (6) after the water is fully filled; S7: inserting a detonator (10) into the explosive (9); S8: detonating the detonator (10) and the explosive (9) to form an integrated explosive welding material.

2. The method for preparing a dissimilar metal connecting material for shipbuilding engineering according to claim 1, characterized in that: In step S1, the thickness of the isolation support plate (2) is 10-20 mm, and the length and width of the isolation support plate (2) are both 200-400 mm greater than the substrate (4).

3. The method for preparing a dissimilar metal connecting material for shipbuilding engineering according to claim 1, characterized in that: The isolation support plate (2) may be one of a gypsum board, a wood fiber board, a high-density polyethylene board, a cement limit plate, an aluminum alloy board, a plastic support composite board, and a steel plate.

4. The method for preparing a dissimilar metal connecting material for shipbuilding engineering according to claim 1, characterized in that: In step S1, the material of the first support block (3) is a wooden block, and the height of the first support block (3) is 5-20 mm.

5. The method for preparing a dissimilar metal connecting material for shipbuilding engineering according to claim 1, characterized in that: In step S1, the material of the substrate (4) is L907A or 945 steel, the thickness of the substrate (4) is 6-30 mm, the length of the substrate (4) is not greater than 7000 mm, and the width of the substrate (4) is not greater than 2500 mm.

6. The method for preparing a dissimilar metal connecting material for shipbuilding engineering according to claim 1, characterized in that: In step S2, the sealing material (5) is industrial waterproof glue.

7. The method for preparing a dissimilar metal connecting material for shipbuilding engineering according to claim 1, characterized in that: In step S3, the second support block 7 is a copper mesh hollow cylinder, and the height of the second support block 7 is 5-20 mm.

8. The method for preparing a dissimilar metal connecting material for shipbuilding engineering according to claim 1, characterized in that: In step S4, the material of the composite plate (8) is TA1, the thickness of the composite plate (8) is 3-20 mm, the length of the composite plate (8) is not greater than 7000 mm, and the width of the composite plate (8) is not greater than 2500 mm.

9. The method for preparing a dissimilar metal connecting material for shipbuilding engineering according to claim 1, characterized in that: In step S5, the explosive (9) is a mixed powdered explosive with powdered emulsion as the main agent and mineral powder added, and the detonation velocity of the explosive (9) is controlled within the range of 1800-2500 m / s.

10. The method for preparing a dissimilar metal connecting material for shipbuilding engineering according to claim 1, characterized in that: In step S7, the detonator (10) is arranged in the middle of the double plate (8).

Images