Explosive welding structure of super-large-area titanium-steel composite plate

Abstract

The utility model is applicable to the technical field of production of metal composite plates, in particular to an explosive welding structure of an ultra-large-area titanium-steel composite plate, which comprises a steel base plate, a plurality of support blocks are arranged on the surface of the steel base plate, and one ends of the plurality of support blocks are jointly connected with a titanium composite plate. According to the utility model, the explosive with low detonation velocity is creatively used as an energy source, and the detonation velocity of the explosive is further reduced to about 1600m / s at the welding end part, so that the exhaust time between the metal plates in the explosion process is effectively prolonged, the amplitude of corrugations on the bonding surface is reduced, and a smoother interface waveform with smaller corrugations is obtained. According to the optimized design, when the titanium-steel composite plate is produced, the quality of a product and the flatness of a joint surface can be remarkably improved, the welding defect caused by unsmooth exhaust or overlarge corrugation in a traditional process is avoided, and especially in the welding process of the titanium-steel composite plate with an ultra-large area specification, the welding quality of the titanium-steel composite plate is greatly improved. And challenges caused by a large-area joint surface can be effectively handled.

Description

Technical Field

[0001] The utility model relates to the technical field of metal composite plate production, in particular to an explosion welding structure of an ultra-large area titanium-steel composite plate. Background Art

[0002] The explosion welding technology of titanium-steel composite plates is a processing method that combines different metal materials through the high-energy impact force generated by the explosion. It is widely used in the fields of chemical industry, metallurgy, electric power, etc. This technology uses the huge energy generated by the explosion to cause a high-energy collision between the titanium plate and the steel base plate in a very short time, and forms a tight metallurgical bond with the help of the jet effect and interatomic force between the metal surfaces. Titanium-steel composite plates have the excellent corrosion resistance of titanium materials and the strength and cost advantages of steel, so they are widely used in the manufacture of large equipment such as high-pressure vessels and reactors. However, due to the large differences in the physical and chemical properties of titanium and steel, during the explosion welding process, problems such as poor exhaust, large corrugations on the bonding surface, and poor fit of the composite plates are often encountered, resulting in unstable welding quality.

[0003] At present, the traditional explosion welding process of titanium-steel composite plates usually uses explosives with a higher detonation velocity to ensure sufficient impact energy to achieve metallurgical bonding of the two metal materials. However, this high detonation velocity process will cause a series of problems in the welding process of titanium-steel composite plates with ultra-large area specifications. First, the exhaust time during welding is short, and the amplitude of the ripples on the bonding surface is too large, resulting in uneven interface waveforms. Especially on large-area joint surfaces, the unevenness of the waveform will be more obvious, affecting the overall bonding quality. In addition, high detonation velocity may bring excessive impact force, causing deformation or even material damage to the titanium composite plate or steel substrate, thereby affecting the bonding strength and durability of the composite plate.

[0004] For ultra-large titanium-steel composite plates, poor exhaust is a more prominent issue due to their large surface area, which can easily lead to defects such as pores and cracks on the joint surface. These defects directly affect the product's fit and weld quality, resulting in low production efficiency and high rework rates. Therefore, in the explosive welding process of ultra-large titanium-steel composite plates, optimizing the welding process, reducing the detonation velocity, and improving exhaust efficiency have become key to improving welding quality and efficiency. Utility Model Content

[0005] The purpose of the embodiment of the present utility model is to provide an explosion-welded structure of an ultra-large area titanium-steel composite plate, aiming to solve the technical problems mentioned in the background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] An explosive welding structure for an ultra-large titanium-steel composite plate comprises a steel base plate, a plurality of support blocks disposed on the surface of the steel base plate, and a titanium composite plate connected to one end of each of the support blocks; a protective layer disposed on the surface of the titanium composite plate, a composite explosive layer disposed on the surface of the protective layer, a detonating charge disposed in the central region of the composite explosive layer, and a detonator disposed within the detonating charge;

[0008] The combined explosive layer includes a first explosive layer and a second explosive layer, and the first explosive layer and the second explosive layer are both laid on the surface of the protective layer. The first explosive layer is cylindrical, and the axis of the first explosive layer is in the same straight line as the center of the titanium composite plate. The second explosive layer surrounds the first explosive layer, and the second explosive layer completely covers the surface of the protective layer.

[0009] Furthermore, the first explosive layer has a detonation velocity of 1810-1830 M / s, a strength of 7 mm, and a density of 0.94 g / cm 3 , milk powder accounts for 46.5%, the second explosive layer has a detonation velocity of 1600-1630M / s, a strength of 6mm, and a density of 1.40g / cm 3 , milk powder accounts for 36%;

[0010] The explosive dosage of the first explosive layer and the second explosive layer is 17.5 kg / m 2 and 15kg / m 2 .

[0011] Furthermore, the gap between the titanium composite plate and the steel base plate is V-shaped.

[0012] Furthermore, the surfaces of the titanium composite plate and the steel base plate are both provided with heat insulation components.

[0013] A titanium-steel composite plate explosive welding process comprises the following steps:

[0014] S1: Select an area with solid and flat soil, evenly spread a layer of fine sand of a preset thickness, and level it as the ground foundation 7;

[0015] S2: Prepare the titanium composite plate and the steel substrate, fully remove the weld seam on the surface of the titanium composite plate, trim the edges of the steel substrate using an oxyacetylene flame, and polish the surfaces to be bonded between the titanium composite plate and the steel substrate;

[0016] S3: Preheat the titanium composite plate and the steel base plate, and attach thermal insulation components to the surfaces of the titanium composite plate and the steel base plate;

[0017] S4: Place the steel base plate on the ground foundation, clean up the excess yellow sand around the ground foundation, and then place several support blocks on the surface of the steel base plate in an orderly manner, and place the titanium composite plate stably on the several support blocks;

[0018] S5: Laying a protective layer on the surface of the titanium composite plate, and laying a first preset explosive in a designated area with a predetermined radius and a center point of the protective layer as the center point of a circle, and laying a second preset explosive in other areas of the surface of the protective layer except the designated area, to form a combined explosive layer;

[0019] S6: setting a detonation point in the center of the combined explosive layer, arranging a detonating charge column inside the detonation point, and setting a detonator inside the detonating charge column;

[0020] S7: Clean the heat-insulating parts from the surface of the titanium composite plate and the steel base plate, detonate the detonator and detonate the combined explosive layer.

[0021] Furthermore, the preset thickness is 50 mm.

[0022] Furthermore, in step S2, a 40-mesh flap wheel is used to grind and polish the surface to be bonded of the titanium composite plate, and a 40-mesh sanding belt is used to grind and polish the surface to be bonded of the steel substrate.

[0023] Furthermore, in step S3, when the titanium composite plate and the steel substrate are preheated, the preheating temperature is not less than 350°C, the preheating time is not less than 30 minutes, and step S7 should be performed within 1.5 hours after the preheating treatment.

[0024] Furthermore, the first preset explosive has a detonation velocity of 1810-1830 M / s, a strength of 7 mm, and a density of 0.94 g / cm 3 , milk powder accounts for 46.5%, the height of the medicine is 40mm, and the dosage is 17.5kg / m 2 ;

[0025] The second preset explosive has a detonation velocity of 1600-1630 M / s, a strength of 6 mm, and a density of 1.40 g / cm 3 , milk powder accounts for 36%, the height of the medicine is 40mm, and the dosage is 15kg / m 2 .

[0026] Furthermore, the density of the explosive column is 0.72 g / cm 3 It is made of powdered emulsion explosive with a detonation velocity of 3750m / s, and the diameter of the explosive column is 25mm and the height is 40mm.

[0027] The utility model provides an explosive welding structure of an ultra-large area titanium-steel composite plate, which has the following beneficial effects:

[0028] This utility model innovatively uses low-detonation-velocity explosives as an energy source and further reduces the explosive detonation velocity to approximately 1600 m / s at the weld end, effectively increasing the exhaust time between the metal sheets during the explosion process, thereby reducing the amplitude of the ripples on the joint surface and achieving a smoother, less rippled interface waveform. This optimized design can significantly improve product quality and the flatness of the joint surface when producing titanium-steel composite plates, avoiding welding defects caused by poor exhaust or excessive ripples in traditional processes. This is especially true when welding ultra-large-area titanium-steel composite plates, effectively addressing the challenges posed by large-area joint surfaces.

[0029] Compared to traditional metal composite plate production processes, this process utilizes theoretical analysis and extensive experimental verification to ultimately determine a series of key parameters. In particular, the use of low-detonation-velocity explosives reduces misalignment defects in composite plate production. This method not only ensures that the titanium-steel composite plates produced meet the requirements of Part 3 of the industry standard NB / T47002-2009, "Explosively Welded Composite Plates for Pressure Vessels," but also achieves a 100% fit rate and a minimum shear strength, τb, of 195 MPa (the minimum shear strength for titanium-steel composite tube sheets is τb ≥ 140 MPa), ensuring the composite plates' excellent performance in high-pressure vessels. Furthermore, the detonator shadow area can be flexibly avoided based on the final product processing, further improving the finished product qualification rate and processing flexibility.

[0030] In practical applications, the explosive welding process of this utility model significantly reduces the occurrence of misalignment during composite plate production, lowering the defective and rework rates, thereby saving significant time, labor, and material costs. This process simplifies operational steps and improves production efficiency, making it particularly suitable for the production of large-area composite plates. It has significant industrial application value and can meet the urgent need for efficient and stable processes in the domestic composite plate production industry. It demonstrates particularly significant advantages in the explosive welding of ultra-large-area titanium-steel composite plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a front view schematic diagram of an explosively welded structure of an ultra-large area titanium-steel composite plate.

[0032] In the figure: 1. Detonator; 2. Combined explosive layer; 3. Protective layer; 4. Titanium composite plate; 5. Support block; 6. Steel base plate; 7. Ground foundation. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0035] like Figure 1 As shown, an embodiment of the present invention provides an explosive welding structure of an ultra-large area titanium-steel composite plate, including a steel base plate 6, a surface of the steel base plate 6 is provided with a plurality of support blocks 5, and one end of the plurality of support blocks 5 is commonly connected to a titanium composite plate 4, a surface of the titanium composite plate 4 is provided with a protective layer 3, a surface of the protective layer 3 is paved with a combined explosive layer 2, and a detonating charge column is provided in the central area of ​​the combined explosive layer 2.

[0036] Detonator 1 is installed within the explosive column. It utilizes a dual-electrode detonation system connected in series to ensure reliable and synchronized detonation. This design effectively improves detonation accuracy and stability, minimizing false detonations and delays, thereby ensuring uniform energy release and consistent weld quality during explosive welding of titanium-steel composite plates.

[0037] The combined explosive layer 2 includes a first explosive layer and a second explosive layer, and the first explosive layer and the second explosive layer are both laid on the surface of the protective layer 3. The first explosive layer is cylindrical, and the axis of the first explosive layer is in the same straight line with the center of the titanium composite plate 4. The second explosive layer surrounds the first explosive layer, and the second explosive layer completely covers the surface of the protective layer 3.

[0038] The detonation velocity of the first explosive layer is 1810-1830M / s, the intensity is 7mm, and the density is 0.94g / cm 3 , milk powder accounts for 46.5%, the second explosive layer has a detonation velocity of 1600-1630M / s, a force of 6mm, and a density of 1.40g / cm 3 , milk powder accounts for 36%;

[0039] The explosive dosage of the first explosive layer and the second explosive layer is 17.5kg / m 2 and 15kg / m 2 .

[0040] In one embodiment of the present invention, the steel substrate 6 used in this application is a Q235-B steel plate with a size of 42mm x 3960mm x 12700mm, and the titanium composite plate 4 is a SB265 Gr1 plate with a size of 4mm x 4000mm x 12750mm. Both the steel substrate and the titanium composite plate of the above specifications are of the ultra-large area type.

[0041] During explosive welding, workers first remotely detonate detonator 1, which triggers the explosive charge, which in turn detonates the combined explosive layer. During the detonation of the combined explosive layer, the first explosive layer, located in the inner circle, is first detonated. As this first layer explodes, the second, outer layer also detonates. During this process, the titanium composite plate 4 rapidly accelerates under the energy of the explosive explosion. Once its velocity stabilizes, it begins to violently collide with the steel base plate 6.

[0042] During the collision, a high-temperature, high-pressure re-entering jet (jet) is generated at the contact point. This jet effectively removes impurities such as oxides, nitrides, gas films, and moisture from the surfaces of the titanium composite plate 4 and the steel substrate 6 to be bonded, exposing fresh, active metal. While the metal surfaces are cleaned, the immense pressure generated during the collision forces the active surfaces of the two metals into close contact. The interatomic forces between the titanium composite plate 4 and the steel substrate 6 create a reliable connection, resulting in a high-quality weld.

[0043] When the titanium composite plate 4 approaches and collides with the steel base plate 6, the strong airflow caused by the explosion will blow away the support blocks 5 between the titanium composite plate and the steel base plate, so that the support blocks 5 will not remain between the two plates, ensuring that the welding surface is clean and free of impurities, thereby ensuring the welding quality.

[0044] In addition, since the detonation velocity, density, intensity and other parameters of the first and second explosive layers have been precisely designed and matched, their graded detonation method ensures that the titanium composite plate is subjected to uniform and appropriate impact force throughout the entire process, thereby avoiding excessive deformation or damage to the titanium composite plate and further improving the quality and reliability of titanium-steel composite plate welding.

[0045] In this embodiment, the gap between the titanium composite plate 4 and the steel substrate 6 is designed as a V-shaped structure, with its tip facing the detonation point. This design not only helps guide the rapid discharge of gases generated during the explosion, but also significantly reduces resistance during gas discharge, avoiding weld defects caused by gas stagnation or poor discharge. Furthermore, the V-shaped gap ensures that the titanium composite plate more smoothly approaches the steel substrate during the explosion acceleration process, reducing unnecessary energy loss and ensuring optimal impact force and velocity matching when the titanium composite plate collides with the steel substrate.

[0046] This structure optimizes the energy transfer between the metal sheets during explosive welding, improving the uniformity and tightness of the surface bond between the titanium composite plate and the steel base plate, and effectively avoiding uneven weld surface phenomena such as pores or weak welds. In addition, the presence of the V-shaped gap provides an additional channel for removing surface impurities and gases, further ensuring the cleanliness of the bonding surface and enhancing the firmness and durability of the metal weld.

[0047] In this embodiment, both the titanium composite plate 4 and the steel base plate 6 are provided with thermal insulation. This insulation can be a flexible thermal blanket or high-temperature-resistant ceramic fiber cloth made of high-temperature insulation material. The insulation is designed to maintain the plate's high temperature after preheating, reducing temperature fluctuations during the welding process. This ensures that the metal surface remains active during explosive welding and prevents degradation of bonding performance due to rapid temperature drops. Furthermore, the insulation effectively reduces the impact of ambient temperature on the plate, ensuring a more stable and reliable welding process between the titanium composite plate and the steel base plate, thereby improving weld quality and strength.

[0048] like Figure 1 As shown, an embodiment of the present invention provides a titanium-steel composite plate explosion welding process, comprising the following steps:

[0049] S1: Select an area with firm and flat soil, evenly spread a layer of fine sand of a preset thickness, and level it as the ground foundation7.

[0050] The 50mm thick layer of fine sand not only provides stable support, ensuring the stability of the steel base plate during subsequent operations, but also absorbs some of the blast energy, preventing ground reaction forces from affecting the smoothness and quality of the welding process. This fine sand foundation design optimizes on-site construction conditions and ensures the stability and safety of the composite plate during welding.

[0051] S2: Prepare the titanium composite plate 4 and the steel substrate 6, fully remove the weld seam on the surface of the titanium composite plate 4, trim the edges of the steel substrate 6 using an oxyacetylene flame, and polish the surfaces to be bonded of the titanium composite plate 4 and the steel substrate 6 to ensure surface smoothness and bonding effect.

[0052] Titanium composite plate 4 (SB265 Gr1) is welded using the GTAW (gas tungsten arc welding) process. After welding, the weld excess height needs to be removed from both sides to ensure the surface flatness of the weld area. After performance testing, the mechanical properties of the weld should be similar to those of the base material to ensure that the weld will not become a weak point during the subsequent explosion welding process, affecting the overall strength of the composite plate. In order to further ensure the edge quality of the steel base plate 6 (Q235-B steel plate), an oxyacetylene flame is used to trim the edges around it to avoid edge defects such as fracture burrs and misalignment. These defects can easily develop into cracks during the explosion welding process, thereby affecting the welding quality. Therefore, edge trimming can effectively prevent the occurrence of such problems.

[0053] Before explosive welding, the flatness of the titanium composite plate 4 and the steel base plate 6 must be strictly controlled, with a flatness range of ≤3mm / m and ≤10mm / plate. No sharp bends or obvious localized bending are permitted. This flatness requirement ensures uniform acceleration of the titanium composite plate during the explosive process, resulting in a smooth collision with the steel base plate, avoiding localized stress concentration and poor welding caused by surface unevenness.

[0054] Through the above settings and strict preliminary treatment, the titanium composite plate and the steel base plate can achieve the best bonding state, ensuring that during the explosive welding process, the bonding surface between the two is clean, flat, and free of stress concentration areas, thereby greatly improving the quality and welding strength of the final composite plate and ensuring the controllability and stability of the process.

[0055] S3: Preheating treatment is performed on both the titanium composite plate 4 and the steel base plate 6.

[0056] The preheating temperature should be no less than 350°C and the duration should be no less than 30 minutes to ensure full activation of the metal surface. Immediately after the preheating treatment is completed, thermal insulation is applied to the surfaces of the titanium composite plate 4 and the steel base plate 6. This insulation can be a flexible insulation blanket, high-temperature ceramic fiber cloth, or composite insulation board made of high-temperature resistant insulation material. This type of insulation effectively isolates the metal plates from the effects of external temperatures, preventing them from cooling due to heat dissipation before explosive welding.

[0057] The function of the thermal insulation is not only to maintain the temperature of the preheated plates, but also to ensure that the metal surfaces are at the optimal bonding temperature during the explosive welding process, preventing the metal surfaces from passivating or losing activity due to temperature drops, which could affect the welding quality between the titanium composite plate 4 and the steel base plate 6. By using the thermal insulation, the thermal equilibrium state of the titanium composite plate and the steel base plate can be effectively maintained before explosive welding, providing a more stable temperature environment for the subsequent welding process, reducing welding defects caused by thermal stress, and further improving the bonding strength and uniformity between the metals.

[0058] S4: Place the steel base plate 6 on the ground foundation 7, clean up the excess yellow sand around the ground foundation 7, and then place several support blocks 5 on the surface of the steel base plate 6 in an orderly manner, and place the titanium composite plate 4 stably on the several support blocks 5.

[0059] The position and number of support blocks are precisely designed to ensure support stability and uniformity. The gap between the titanium composite plate 4 and the steel base plate 6 is maintained at approximately 8 mm, and the gap is designed as a V-shaped structure, with the tip facing the detonation point. This V-shaped gap design helps guide the flow of gas generated by the explosion during the explosion, significantly reducing resistance during gas discharge and avoiding welding defects caused by gas stagnation or uneven discharge. In addition, this structural design ensures that the titanium composite plate accelerates more smoothly under the action of the explosion energy, achieving uniform and smooth contact with the steel base plate 6, effectively reducing stress concentration and deformation of the metal plate.

[0060] Through the reasonable arrangement of the support blocks 5 and the V-shaped gap design, it is possible to ensure that the titanium composite plate 4 is combined with the steel substrate 6 at the optimal speed and angle when colliding, thereby maximizing the cleanliness and activity of the metal surface, thereby improving the welding strength and welding quality of the titanium-steel composite plate.

[0061] S5: Laying a protective layer 3 on the surface of the titanium composite plate 4, and laying a first preset explosive in a designated area with a preset radius and a center point of the protective layer 3 as the center point of a circle, and laying a second preset explosive in other areas of the surface of the protective layer 3 except the designated area to form a combined explosive layer.

[0062] On the premise that the steel base plate 6 is a Q235-B steel plate with a specification of 42 mm × 3960 mm × 12700 mm and the titanium composite plate 4 is a SB265 Gr1 plate with a specification of 4 mm × 4000 mm × 12750 mm, the preset distance is 3100 mm.

[0063] S6: setting a detonation point in the central area of ​​the combined explosive layer, arranging an explosive column inside the detonation point, and setting a detonator 1 inside the explosive column.

[0064] S7: Clean the heat-insulating member from the surface of the titanium composite plate 4 and the steel base plate 6, detonate the detonator 1 and detonate the combined explosive layer.

[0065] The first preset explosive has a detonation velocity of 1810-1830 M / s, a strength of 7 mm, and a density of 0.94 g / cm 3 , milk powder accounts for 46.5%, the height of the medicine is 40mm, and the dosage is 17.5kg / m 2 ;

[0066] The second preset explosive has a detonation velocity of 1600-1630 M / s, a strength of 6 mm, and a density of 1.40 g / cm 3 , milk powder accounts for 36%, the height of the medicine is 40mm, and the dosage is 15kg / m 2 .

[0067] The amount of the first and second preset explosives used is significantly lower than that used for conventional stainless steel plates because the density of titanium plates is much lower than that of stainless steel. Therefore, using less explosives can provide sufficient impact force to the titanium composite plates, achieving effective welding. Furthermore, appropriately reducing the amount of explosives used can also prevent excessive shock waves during the explosion and the formation of adiabatic shear lines. Adiabatic shear lines can cause unevenness in the weld interface, affecting weld quality. Therefore, reducing the amount of explosives helps achieve a more stable and uniform metal bond.

[0068] In one embodiment of the present invention, an explosive welding process for titanium-steel composite plates is proposed. Targeting the different characteristics of the titanium composite plates and the steel base plates, precise explosion parameter control and plate processing methods are combined to ensure high-quality composite welding effects.

[0069] The process begins with thorough preparation of the titanium composite plate (SB265 Gr1) and the steel base plate (Q235-B steel plate). The titanium composite plate is welded using GTAW (gas tungsten arc welding). After welding, the weld seam must be removed and its mechanical properties must be comparable to those of the parent material to avoid weaknesses during subsequent welding. The steel base plate undergoes oxyacetylene flame trimming to eliminate edge defects such as burrs and misalignments, which could develop into cracks during explosions.

[0070] The flatness of the interface between the titanium composite plate and the steel base plate must be strictly controlled, with a flatness requirement of ≤3mm / m and ≤10mm / plate. This ensures that the plates can be smoothly and evenly accelerated during explosive welding, avoiding welding defects caused by localized stress concentration. The two metal plates are preheated to above 350°C for at least 30 minutes. The preheated plates are covered with insulation to ensure that the metal maintains optimal activity and temperature before welding, preventing degradation of weld quality due to cooling.

[0071] A V-shaped gap of approximately 8mm is designed between the titanium composite plate and the steel base plate, with the tip pointing toward the detonation point. This V-shaped structure not only effectively reduces resistance to gas discharge but also guides the airflow during explosion, preventing gas stagnation or uneven discharge, thereby ensuring a tighter bond between the titanium composite plate and the steel base plate.

[0072] The most critical part of this process is the design of the explosives. The combined explosive layer consists of a first preset explosive and a second preset explosive. The first preset explosive has a detonation velocity of 1810-1830M / s, a strength of 7mm, and a density of 0.94g / cm 3 , milk powder accounts for 46.5%, the spreading height is 40mm, and the dosage per unit area is 17.5kg / m 2The main function of this explosive layer is to provide the initial impact force, rapidly accelerating the titanium composite plate to a speed suitable for welding, providing sufficient kinetic energy for welding, and controlling the deformation of the titanium composite plate. Its high detonation velocity and high intensity ensure that the titanium composite plate can quickly reach the required collision speed.

[0073] The second preset explosive has a detonation velocity of 1600-1630 M / s, a strength of 6 mm, and a density of 1.40 g / cm 3 Milk powder accounts for 36%, the height of the medicine laying is 40mm, and the dosage per unit area is 15kg / m 2 Compared with the first explosive layer, the second explosive layer has a lower detonation velocity and softer force. It is mainly responsible for balancing and replenishing energy during the process of the titanium composite plate accelerating to approach the steel substrate, ensuring that the titanium composite plate contacts the steel substrate at the optimal speed and pressure during the collision, avoiding damage to the plate caused by excessive impact.

[0074] Through the precise design and control of the two layers of explosives, the first layer provides sufficient impact force to accelerate the titanium composite plate, while the second layer is responsible for controlling the release of energy, so that the collision between the titanium composite plate and the steel base plate can generate sufficient bonding force without causing material damage. This staged detonation method can effectively improve the welding quality of titanium-steel composite plates, ensuring a uniform joint surface without cracks or delamination, and maximizing weld strength and stability.

[0075] Overall, the present invention achieves optimal results in the welding process of titanium-steel composite plates through meticulous pre-processing of the plates, efficient preheating and insulation measures, and precise control of the explosion energy, ensuring the performance stability and durability of the composite materials in various complex application environments.

[0076] In this embodiment, in step S2, a fine grinding and polishing process is employed to treat the surfaces of the titanium composite plate 4 and the steel substrate 6 to be bonded. Specifically, a 40-mesh flap wheel is used to grind and polish the surfaces of the titanium composite plate 4 to ensure a smooth surface free of oxides and other impurities. A 40-mesh abrasive belt is used to grind and polish the steel substrate 6 to similarly ensure a flat and smooth surface. This fine grinding process further enhances the surface activity and cleanliness of the bonding surfaces, providing an excellent foundation for subsequent explosive welding and ensuring a tight metal-metal bond and weld quality.

[0077] In this embodiment, the explosive column adopts a density of 0.72g / cm 3Made from powdered emulsion explosive with a detonation velocity of 3750m / s, it offers excellent explosive stability and reliability. The explosive column is designed with a diameter of 25mm and a height of 40mm. These dimensions and material parameters have been precisely calculated to ensure that the explosive column generates sufficient impact force upon detonation, quickly and evenly detonating the combined explosive layer.

[0078] The design of the explosive column not only provides sufficient explosive energy, but also effectively controls the speed and range of the explosion, ensuring synchronization and stability throughout the detonation process. This design avoids excessive local energy or uneven energy distribution, ensuring optimal bonding between the titanium composite plate and the steel base plate during collision, and maximizing the weld strength and quality of the composite plate.

[0079] After explosive welding, the turret should be trimmed to ensure that its overall flatness is within 6mm / plate, with no local voids or protrusions. This prevents poor foundation flatness from hindering ventilation and affecting welding quality. A 50mm thick layer of fine sand should be evenly laid on the ground to provide a buffer and prevent delamination in the welded area due to tensile waves caused by a hard foundation during the explosive lamination process.

[0080] After explosive cladding, heat treatment and leveling are performed, resulting in a composite plate that meets the requirements of Part 3 of the industry standard NB / T47002-2009, "Explosively Welded Composite Plates for Pressure Vessels." With the exception of the detonator shadow area, the composite plate achieves 100% adhesion, and its minimum shear strength, τb, is no less than 195 MPa (the minimum shear strength, τb, for titanium-steel composite tube sheets is no less than 140 MPa). The detonator shadow area (detonation point) can be avoided based on the processing requirements of the finished product, ensuring the integrity and high strength of the finished product in critical areas.

[0081] In summary, by innovatively using low-detonation-velocity explosives as an energy source and further reducing the explosive detonation velocity to approximately 1600 m / s at the weld end, the detonation time between the metal sheets during the explosion process is effectively increased, thereby reducing the amplitude of the ripples on the bonding surface and achieving a smoother, less rippled interface waveform. This optimized design can significantly improve product quality and the flatness of the bonding surface when producing titanium-steel composite plates, avoiding welding defects caused by poor degassing or excessive ripples in traditional processes.

[0082] Compared to traditional metal composite plate production processes, this process utilizes theoretical analysis and extensive experimental verification to ultimately determine a series of key parameters. In particular, the use of low-detonation-velocity explosives reduces misalignment defects in composite plate production. This method not only ensures that the titanium-steel composite plates produced meet the requirements of Part 3 of the industry standard NB / T47002-2009, "Explosively Welded Composite Plates for Pressure Vessels," but also achieves a 100% fit rate and a minimum shear strength, τb, of 195 MPa (the minimum shear strength for titanium-steel composite tube sheets is τb ≥ 140 MPa), ensuring the composite plates' excellent performance in high-pressure vessels. Furthermore, the detonator shadow area can be flexibly avoided based on the final product processing, further improving the finished product qualification rate and processing flexibility.

[0083] In practical applications, the explosive welding process of this utility model significantly reduces the occurrence of misalignment during composite panel production, lowering the defective and rework rates, thereby saving significant time, labor, and material costs. This process simplifies operational steps and improves production efficiency, making it particularly suitable for the production of large-area composite panels. It has significant industrial application value and can meet the urgent need for efficient and stable processes in the domestic composite panel production industry.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An explosive welding structure of an ultra-large area titanium-steel composite plate, comprising a steel base plate, characterized in that: The surface of the steel substrate is provided with a plurality of support blocks, and one end of the plurality of support blocks is commonly connected to a titanium composite plate, the surface of the titanium composite plate is provided with a protective layer, the surface of the protective layer is paved with a combined explosive layer, the central area of ​​the combined explosive layer is provided with an explosive column, and the interior of the explosive column is provided with a detonator; The combined explosive layer includes a first explosive layer and a second explosive layer, and the first explosive layer and the second explosive layer are both laid on the surface of the protective layer. The first explosive layer is cylindrical, and the axis of the first explosive layer is in the same straight line as the center of the titanium composite plate. The second explosive layer surrounds the first explosive layer, and the second explosive layer completely covers the surface of the protective layer.

2. The explosion-welded structure of an ultra-large area titanium-steel composite plate according to claim 1, characterized in that: The gap between the titanium composite plate and the steel base plate is V-shaped.

3. The explosion-welded structure of an ultra-large area titanium-steel composite plate according to claim 1, characterized in that: The surfaces of the titanium composite plate and the steel base plate are both provided with heat insulation parts.

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