An explosive compounding device for a titanium alloy coaxial pipe fitting and an explosive compounding method thereof

Abstract

The present application relates to the technical fields of metal material processing and explosive welding, and particularly relates to an explosive compounding device for titanium alloy coaxial pipe fittings and an explosive compounding method thereof, the method comprising: coaxially sleeving a second titanium alloy pipe inside a first titanium alloy pipe and reserving a gap; sleeving the two pipes on a support member and adjusting coaxiality through an inside diameter dial gauge; sleeving an annular explosive column around the outer periphery of the first titanium alloy pipe and arranging an external restraint structure; arranging a charge transmission base plate with uniformly distributed grooves and an explosion-proof end cover at the end of the annular explosive column; detonating the annular explosive column, using an explosion shock wave to drive the first titanium alloy pipe to collide with the second titanium alloy pipe at high speed, and realizing metallurgical bonding and synchronous strengthening. Through 360° external charging, multi-point synchronous detonation and internal and external restraint structures, the present application realizes one-time compounding and strengthening of large-size titanium alloy coaxial pipe fittings, significantly improves the yield strength, and controls the plastic loss within 20%.

Description

Technical Field

[0001] This invention relates to the field of metal material processing and explosive welding technology, specifically to an explosive bonding device and method for titanium alloy coaxial pipe fittings. Background Technology

[0002] Titanium alloys, due to their lightweight and high specific strength, are widely used as structural materials in various industrial fields such as aerospace, machinery manufacturing, and deep-sea oil and gas. Medium-strength titanium alloys (such as TA15, TC4, and TC7) combine good strength and ductility and have been widely used in industrial production in the past. However, with the overall upgrading and transformation of the manufacturing industry, high-end applications have placed more stringent requirements on material strength, and traditional single medium-strength titanium alloys can no longer meet these needs.

[0003] Abandoning existing traditional titanium alloys in favor of developing new high-strength titanium alloys would not only result in a large-scale waste of existing mature alloy resources, but also lead to long development cycles, high costs, and complex reliability verification processes for new titanium alloys, making it difficult to quickly respond to the current demands of industrial upgrading. Therefore, developing methods to significantly improve the comprehensive mechanical properties of existing medium-strength titanium alloys has become a key focus and crucial aspect of current research in related fields.

[0004] Among existing strengthening technologies in industrial production, work hardening and grain boundary strengthening generated by large-scale pressure processing equipment are widely used for performance optimization of titanium alloys. Severe Plastic Deformation (SPD) generated during processing is currently one of the most effective means to improve the overall mechanical properties of titanium alloys. However, these traditional processing methods have significant shortcomings: while increasing strength, they reduce plasticity, making brittle fracture more likely; loading large-sized titanium alloy parts is difficult, resulting in insufficient and uneven deformation, which easily leads to defects; and the equipment size is limited, making it difficult to process large components as a whole. Specifically, high-pressure torsion (HPT) technology has demanding equipment requirements and is only suitable for small-sized samples; equal channel extrusion (ECAP) technology results in uneven strain, requires strict control of process parameters, and is only suitable for small to medium-sized simple billets; multi-directional forging (MF) technology has sensitive process parameters, is only suitable for small to medium-sized billets, and has poor microstructure uniformity.

[0005] Explosive welding composite technology, utilizing instantaneous high-energy impact and intense plastic deformation effects, can significantly refine the grains of titanium alloys and their composite structures, introducing strengthening structures such as high-density dislocations and twins, enabling composite pipes to combine the advantages of both base pipe and composite pipe materials. However, traditional flat plate explosive welding is prone to problems such as plate warping, poor interface uniformity, and excessive residual stress when preparing titanium alloy composite components. Although implosion method can be used for the preparation of some titanium alloy composite pipes, it is constrained by the internal explosive charge, which can easily cause uneven stress on the pipe, local overmelting, interface embrittlement, and structural instability, often resulting in a difficulty in achieving both interface strength and plasticity of titanium alloys.

[0006] In existing technologies, for titanium-aluminum dissimilar metal composites, some studies have proposed using explosive welding to prepare large-size TA10 / 6061 composite tubes, achieving high-quality metallurgical bonding of dissimilar metals through numerical simulation optimization combined with actual processes. However, this technology still has significant drawbacks: single-point detonation at the upper end with amorphous charge easily leads to uneven detonation wave propagation and poor charge adhesion; the titanium-aluminum dissimilar composite is constrained by the properties of the aluminum layer, and the overall mechanical properties are a compromise result; the prepared composite tube has an outer diameter of only 125mm, indicating insufficient capacity for large-size fabrication.

[0007] Another study employed the implosion method to achieve efficient cladding of Ta-10W alloy on the inner surface of steel pipes, forming a high-quality bonding interface through precise control of process parameters. However, the implosion method has significant technical shortcomings: the charging space is limited by the inner diameter of the steel pipe, making it difficult to precisely control the uniformity of the explosive arrangement; the shock wave propagating along the circumference of the steel pipe is prone to energy superposition effects, and local areas are prone to excessively large melting zones due to excessive energy; the narrow working space inside the steel pipe significantly reduces the convenience of pre-welding pretreatment, clamping and positioning, and post-welding inspection.

[0008] For the biomedical field, a patent proposes a composite structure with titanium / titanium alloy as the cladding layer and nickel-chromium alloy as the core material, using explosive welding technology as the core method to achieve effective bonding of dissimilar metals. However, the technical solution of this patent has inherent defects: the core solid composite structure causes the energy of the explosive shock wave to rapidly conduct inward and attenuate after contacting the solid core material, making it impossible to form an effective and uniform reflected shock wave at the composite interface; it only provides a general qualitative description of key aspects such as drug loading, drug delivery, and restraint, lacking standardized device design and operational details. Summary of the Invention

[0009] To address the shortcomings of the existing technologies, the present invention aims to provide an explosive composite device and method for titanium alloy coaxial tubular components, solving the problem of "strength enhancement inevitably leads to plasticity loss", achieving synergistic optimization of strength and plasticity, breaking through the processing bottleneck of large-size components, overcoming the problems of uneven energy and coaxiality deviation in traditional explosive welding, and achieving universal composite and process simplification.

[0010] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An explosive composite device for a titanium alloy coaxial tubular fitting includes: Rubber cushioning base, used for support and cushioning.

[0011] A steel support column, with its bottom mounted on a rubber buffer base, is used to support the second titanium alloy tube and the first titanium alloy tube, which are coaxially arranged on its outer side in sequence.

[0012] The inside dial indicator is used to measure the coaxiality of the second titanium alloy pipe, the steel support column, and the first titanium alloy pipe.

[0013] The annular explosive charge is made by wrapping powdered emulsion explosive in two layers of sealed oil paper and hydraulically pressing it, and then fitting it onto the outer layer of the first titanium alloy tube.

[0014] A steel restraint structure is set on the outermost layer of the annular propellant charge.

[0015] The steel charge transfer base plate has multiple uniform and equal-length grooves engraved around its center. The charge transfer material is pressed into the grooves. Each groove has a charge transfer hole that penetrates the steel charge transfer base plate at the other end. Below the charge transfer hole is the top surface of the annular charge.

[0016] A steel explosion-proof end cap is installed above a steel drug delivery base plate, and a detonator seat is provided at the corresponding position in the center of the steel drug delivery base plate.

[0017] A detonator, inserted into a detonator holder, is used to detonate the explosive charge.

[0018] In a preferred embodiment of the present invention, there are at least four grooves.

[0019] In a preferred embodiment of the present invention, the gap between the first titanium alloy tube and the second titanium alloy tube is 2mm to 5mm.

[0020] A gap of 5mm to 10mm is reserved between the steel support column and the inner wall of the second titanium alloy tube.

[0021] The annular explosive charge is formed by pressing powdered emulsion explosives wrapped in double-layered sealed oil paper by a hydraulic press, and its inner diameter is slightly larger than the outer diameter of the first titanium alloy tube.

[0022] In a preferred embodiment of the present invention, in step five, the steel explosive transfer base plate is a steel circular plate, and the explosive is pressed into the groove; the steel explosion-proof end cap is provided with a detonator seat for inserting a detonator.

[0023] In a preferred embodiment of the present invention, the first titanium alloy tube is an α+β type titanium alloy, and the second titanium alloy tube is a near-α type titanium alloy; the dimensions of the first titanium alloy tube and the second titanium alloy tube are: outer diameter < 1000 mm, wall thickness < 150 mm, and length < 1500 mm.

[0024] In a preferred embodiment of the present invention, the first titanium alloy tube and the second titanium alloy tube are homogeneous or near-homogeneous medium-strength titanium alloys, selected from any two combinations of TA15, TC4, TC11, and TC7.

[0025] An explosive composite strengthening and toughening method for titanium alloy coaxial tubular fittings includes the following steps: A first medium-strength titanium alloy tube and a second medium-strength titanium alloy tube are provided, wherein the outer diameter of the second titanium alloy tube is smaller than the inner diameter of the first titanium alloy tube.

[0026] The first titanium alloy tube and the second titanium alloy tube were coaxially fitted onto the outside of the steel support column on the rubber buffer base in sequence; the coaxiality was measured with an inside dial indicator.

[0027] A non-porous annular propellant charge is fitted onto the outer circumferential surface of the first titanium alloy tube, and a steel constraint structure is provided on the outer circumferential surface of the annular propellant charge.

[0028] A steel propellant transfer substrate is first placed on top of the steel support column, the first titanium alloy tube, the second titanium alloy tube, the annular explosive charge, and the steel constraint structure. The upper surface of the steel propellant transfer substrate is uniformly engraved with multiple grooves of equal length and evenly distributed. Each groove has a detonation hole that penetrates the steel propellant transfer substrate at its outer end. All detonation holes are directly opposite the top surface of the annular explosive charge on the outer wall of the first titanium alloy tube below. Propellant is evenly arranged in the grooves so that the propellant communicates with the annular explosive charge through the multiple detonation holes.

[0029] The steel support columns are made of Q345B steel.

[0030] A steel explosion-proof end cap is placed on top of a steel explosive transfer substrate. A detonator is inserted into the center of the steel explosion-proof end cap, with the bottom end of the detonator located at the intersection of the four grooves. After the detonator detonates, the detonation wave propagates outward through the explosive transfer material in the grooves and detonates the annular explosive charge downward through the four detonation holes. The strong pulse shock wave generated by the explosion drives the first titanium alloy tube to collide with the second titanium alloy tube at high speed, achieving metallurgical bonding and synchronous strengthening of the two.

[0031] In a preferred embodiment of the present invention, the groove depth of the steel explosive transfer substrate is 5mm~15mm, the width is 10mm~20mm, the explosive transfer charge is terane or RDX, and the packing density is 1.5g / cm³. 3 ~1.7g / cm 3The steel explosion-proof end cap and the steel constraint structure are connected by threads or flanges to form an integrated explosion-proof protection system, which effectively constrains the detonation wave energy from leaking out and fixes the explosive charge to prevent displacement and deformation.

[0032] The yield strength of the titanium alloy coaxial tube is increased by more than 40% compared with the original titanium alloy tube, and its elongation decreases by no more than 20% compared with the original titanium alloy tube.

[0033] Compared with the prior art, the beneficial effects of the present invention are: 1. The rubber buffer base of this invention provides a flexible support foundation for the entire device. The bottom surfaces of the steel support column, the second titanium alloy tube, and the first titanium alloy tube all rest on it, absorbing the downward impact energy during explosive loading and preventing the upward superposition of rigid reflected waves from the ground from interfering with the explosive welding process. Surface friction is used to axially limit the bottom of each tube, preventing lateral slippage of the assembly. The steel support column, serving as a central rigid positioning reference axis, is vertically positioned at the center of the rubber base, providing a self-aligning reference for the subsequent second titanium alloy tube. It provides rigid internal support for the second titanium alloy tube, maintaining the inner tube structure from inward deformation when subjected to high-speed impact from the outer tube; ensuring the inner... The precise impact fit of the outer tube provides the geometric conditions for a stable metallurgical bond. The second titanium alloy tube is coaxially fitted onto the outer ring of the steel support column with a clearance fit. The annular gap is measured and adjusted using an inner diameter dial indicator to ensure circumferential uniformity, forming a pre-sized annular gap layer between the steel support column and the second titanium alloy tube. This serves as an intermediate transition layer, providing an outer ring self-aligning reference for the first titanium alloy tube. Layer-by-layer self-aligning eliminates the cumulative eccentricity caused by the roundness tolerance and straightness deviation of the single-layer tube itself. As an intermediate buffer layer of the composite tube, it absorbs some impact energy during explosive welding, regulates the collision pressure distribution between the inner and outer tubes, and prevents direct impact between the outer tube and the inner steel column. Excessive deformation or localized ablation of the interface caused by impact enhances the elongation after fracture and impact toughness of the composite component. It reduces residual stress at the interface through buffering and energy absorption, delaying the initiation and propagation of microcracks. This gives the composite pipe higher plastic deformation capacity and resistance to interlaminar cracking under axial tensile or bending loads. The first titanium alloy pipe is coaxially fitted onto the outer ring of the second titanium alloy pipe with a clearance fit. Coaxiality is also ensured by measuring and adjusting the annular clearance, forming an outer annular clearance layer that, together with the second titanium alloy pipe, constitutes a pre-designed double-layer clearance structure. The outer wall provides a contact reference surface for the powder emulsion explosive column, ensuring uniform circumferential thickness of the explosive column. As the component of the composite pipe that withstands the explosion... The outer tube, driven directly by impact, has material strength and wall thickness that directly determine the critical collision velocity and collision pressure required for explosive welding. It serves as the energy transfer carrier for achieving a wavy metallurgical bond at the composite interface. By enhancing the yield strength and interfacial shear strength of the composite, and through its intrinsic high strength and the wavy metallurgical bond interface formed by explosive welding, the composite tube exhibits higher resistance to plastic deformation and interfacial delamination when subjected to internal pressure, radial compression, or torsional loads. The annular explosive charge is wrapped in double-layer sealed oil paper and tightly fitted onto the outer wall of the first titanium alloy tube. It serves as the energy source for explosive welding, forming a thin-walled cylindrical charge structure that drives the first titanium alloy tube to impact inward at high speed during detonation.Double-layered oil paper wrapping provides moisture protection and sealing, ensuring stable explosive performance. This design employs an external detonation method, with the explosive encased on the outer wall of the outer tube. The charging space is not limited by the inner diameter, and the detonation propagates from the outside in. The inner tube is supported by internal steel columns to maintain its shape stability, and the detonation products naturally dissipate outwards. The structure is simple and reliable, making it more suitable for the explosive welding preparation of high-performance composite pipes. A steel constraint structure is encased on the outermost layer of the powder emulsion explosive column, providing radial inertial constraint. At the moment of detonation, the inertia of the steel shell resists the radial expansion of the explosive column, delaying the detonation products from spreading outwards. Outward dispersion; concentrating and guiding the detonation energy inward, extending the time window for the high-pressure gas to act on the pipe, limiting irregular plastic deformation such as bulging, wall deviation, and out-of-roundness of the first titanium alloy pipe before impact, ensuring that the outer pipe completes the directional impact in a preset shape; a steel propellant transfer substrate is installed on the top surface of the steel support column, the first titanium alloy pipe, the second titanium alloy pipe, the explosive column, and the steel constraint structure, serving as the carrier of the detonation channel and the axial end face positioning component; four equally distributed grooves are opened on its upper surface, each groove Four detonation transmission holes, penetrating the plate thickness, are opened at the outer end of the groove. These holes face the top surface of the explosive column below, and their lower surfaces contact the top surfaces of each component, establishing a unified axial rigid reference surface. Four equal-length grooves provide horizontal channels for the explosive transmission, and the equal length of the grooves ensures consistent transmission distances, enabling the four detonation waves to arrive at the detonation transmission holes simultaneously. The detonation transmission holes vertically guide the detonation energy downwards to four symmetrical points at the top of the explosive column. Upon detonation, a ring-shaped sliding detonation wave front that propagates uniformly downwards along the axial direction is formed, converting the single-point detonation of the detonator into a four-way synchronous detonation. The detonation transmission system achieves four-point symmetrical initiation, eliminating the oblique asymmetrical loading caused by single-point initiation and realizing uniform impact throughout the circumference. Steel explosion-proof end caps and detonator caps are located above the charge-transmitting base plate. The detonator is inserted into the central detonator holder, sealing the four grooves to prevent upward leakage of the charge energy and ensure that all energy is transferred downwards. This fixes the detonator position, ensuring that the bottom of the detonator is accurately located at the center of the intersection of the four grooves. It also serves as a safety protection mechanism, preventing detonator fragments from flying out. After the detonator detonates, the detonation wave travels through the grooves, charge-transmitting holes, and explosive column to form a complete initiation chain.

[0034] 2. The steel support column is placed upright at the center of the rubber base as a rigid positioning reference; the second titanium alloy tube is aligned with the steel column by measuring the annular gap; the first titanium alloy tube is aligned again with the second titanium alloy tube as the reference, and the three form a progressive coaxiality transmission chain. The rubber base provides stable support at the bottom, ensuring that the inner and outer tubes achieve high coaxiality before explosive welding, providing the geometric prerequisite for uniform impact in the entire circumference.

[0035] 3. The 360-degree synchronous detonation chain consists of a detonator, a steel charge transfer base plate with grooved charge transfer, a detonation port, and an explosive column. The detonator is detonated at the center of the explosion-proof end cap. The detonation wave propagates synchronously along four equal-length grooves to the outer end, and then detonates vertically downward through the detonation port at four symmetrical points on the top of the explosive column. After detonation at four points, each point forms a detonation wave front, which propagates downward in the explosive column and merges into a uniform annular wave front, achieving synchronous detonation in the entire circumference. This eliminates the energy unevenness and attenuation problem of single-point detonation and ensures that all points in the circumference of the first titanium alloy tube obtain a consistent impact velocity. By directly coating the outermost titanium alloy with explosives, a short-path energy transfer channel with no intermediate losses is constructed, resulting in uniform and highly efficient energy transfer. This eliminates the need to strictly limit collision parameters to near the lower limit of the weldable window, thus avoiding welding defects. Simultaneously, the active positioning solution of "steel support columns + inner diameter dial indicator" precisely controls the coaxiality of the two titanium alloy tubes, strictly controlling the error to the micrometer level. This fundamentally avoids the gap fluctuation risk that is prone to in passive positioning, significantly reducing the difficulty and cost of process debugging, and easily achieving high-precision interface metallurgical bonding. 4. The relationship between the annular explosive charge, the steel constraint structure, the first titanium alloy tube, the second titanium alloy tube, and the steel support column of this invention is as follows: When the explosive charge detonates, it expands outward, and the inertia of the steel constraint structure resists the expansion, concentrating the energy inward; the first titanium alloy tube accelerates inward under the action of detonation pressure to impact the second titanium alloy tube; the second titanium alloy tube transmits the impact force to the steel support column; the steel support column provides rigid counter-support, resists inward deformation, and forms a two-way limiting system of external constraint and internal support, ensuring that all impact energy is applied to the interface bonding, rather than dissipated in the random deformation of the tube.

[0036] 5. The axial positioning chain of the present invention consists of a rubber base, a second titanium alloy tube, the bottom end face of a first titanium alloy tube, a charge transfer substrate, and an explosion-proof end cap. The bottom end faces of the second and first titanium alloy tubes abut against the rubber base, and their top ends contact the lower surface of the charge transfer substrate. The explosion-proof end cap covers the charge transfer substrate, forming a complete axial positioning and sealing system from the bottom to the top, ensuring precise alignment between the detonation hole and the top end face of the explosive charge, and preventing assembly gaps from causing detonation interruption or energy loss.

[0037] 6. The external explosion layout of this invention directly drives the outer fly layer to collide uniformly with the inner substrate through an active impact mode. Combined with a precise coaxial design, this ensures stable alignment of the tube during the collision process, effectively improving the interface forming problem under the passive expansion drive of the implosion method. In existing implosion methods, the deformation uniformity of the Ta-10W inner tube is highly dependent on the strict control of the detonation velocity and annular gap. Even after actual welding, interface wavy structure fluctuations and shifts are still prone to occur. However, the metal jet impact force generated by this technology is stronger, which can completely remove the stable TiO2 oxide film on the titanium alloy surface. It also allows for flexible adjustment of interface wavy structure parameters, avoiding the risk of connection between the vortex melting zone (VMZ) and the interface melting zone (IMZ) in the implosion method. This significantly improves the stability and reliability of the interface bonding, structurally eliminating the hidden dangers of crack initiation and propagation.

[0038] 7. This technology is specifically designed for the needs of dual medium-strength titanium alloy composites. Energy input is precisely controlled within the "plastic deformation threshold - recrystallization temperature" range, perfectly meeting the material's performance requirements of "strength-toughness balance." Compared to the implosion method in the literature, which is limited by tubular structures and passive coaxial positioning, making it difficult to adapt to complex composite requirements, and whose core welding parameters are not disclosed due to proprietary technology, hindering large-scale promotion, this technology uses a combination of steel support columns and an inner diameter dial indicator. This combination can flexibly adapt to titanium alloy tubing of different sizes, has strong process replicability, and requires no complex customized chemical equipment. It provides a feasible path for the industrial production of wide and long titanium alloy composite components, effectively breaking through the bottleneck of large-scale application of the implosion method.

[0039] 8. This invention leverages the material matching advantage of dual medium-strength titanium alloys to achieve dislocation strengthening through high-pulse shock wave-induced large plastic deformation, completely overcoming the performance limitations of traditional heterogeneous composite and strengthening technologies. In existing technologies, Ta-10W / steel composites are heterogeneous material combinations, with significant performance differences between Ta-10W and steel (Ta-10W has high hardness and medium plasticity, while steel has medium strength and good plasticity). Although the interface is firmly bonded, the overall plasticity is still dominated by a single parent material, and brittle regions such as VMZ and IMZ further restrict plastic deformation capabilities, making it difficult to achieve synergistic optimization of strength and plasticity. In contrast, the dislocation strengthening mechanism of this technology significantly improves yield strength without excessively compromising the material's excellent plasticity, ultimately achieving a significant increase in yield strength with a decrease in elongation of less than 20%. This effectively solves the problem of difficulty in synergistically optimizing strength and plasticity in existing technologies, achieving a balance between strength and plasticity. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the explosive composite strengthening and toughening device for titanium alloy coaxial pipes in Embodiment 1 of the present invention.

[0041] Figure 2A is a schematic diagram of the inner diameter dial indicator in Embodiment 1 of the present invention, B is a schematic diagram of the drug transfer substrate in Embodiment 1 of the present invention, and C is a schematic diagram of the steel explosion-proof end cap and detonator.

[0042] Figure 3 These are transmission electron microscope (TEM) images of the area near the interface of the TA15 / TC4 composite tube obtained in Example 1 of the present invention, where A is a TEM image at 0.5 μm and B is a TEM image at 0.2 μm.

[0043] Explanation of reference numerals in the attached figures: 1. Rubber buffer base; 2. Steel support column; 3. Inner diameter dial indicator; 4. Annular explosive charge; 5. Steel constraint structure; 6. Steel explosive transfer base plate; 6-1 groove; 6-2 detonation hole; 7. Steel explosion-proof end cap; 8. Detonator; A. First titanium alloy tube; B. Second titanium alloy tube. Detailed Implementation

[0044] The following detailed description, in conjunction with embodiments of the present invention and accompanying drawings, provides a clear and complete illustration of the technical solutions in these embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0045] It should be noted that all technical terms used in this invention are for the purpose of describing specific embodiments only and are not intended to limit the scope of protection of this invention. Unless otherwise specified, all raw materials, reagents, instruments and equipment used in the following embodiments of this invention can be purchased from the market or prepared by existing methods.

[0046] (1) Two types of medium-strength titanium alloy ingots were selected, and the first titanium alloy tube A and the second titanium alloy tube B were cut into large-sized hollow cylindrical tubes with outer diameter (<1000mm, the outer diameter of the first titanium alloy tube B is smaller than the inner diameter of the second titanium alloy tube A), wall thickness (<150mm), and length (<1500mm). The surface of the tubes was ground and polished to remove the surface oxide film and impurities, and then ultrasonically cleaned.

[0047] (2) On the rubber buffer base 1, the steel support column 2 is concentrically inserted into the first titanium alloy pipe A and the second titanium alloy pipe B. The coaxiality of the two is ensured by the inner diameter dial indicator 3. A gap of 2~5mm is reserved between the first titanium alloy pipe A and the second titanium alloy pipe B. A gap of 5~10mm is reserved between the steel support column 2 (diameter > 300mm) and the inner wall of the second titanium alloy pipe B.

[0048] (3) Wrap the powder emulsion explosive or other industrial explosives with double-layer sealing oil paper (thin inner layer and thick outer layer), tie the inner and outer ring ends tightly, and press them into annular explosive columns 4 with an inner diameter slightly larger than the outer diameter of the titanium alloy tube by a hydraulic press. Place them on the outer layer of the first titanium alloy tube A. Install a steel restraint structure 5 on the outermost layer of the assembled annular explosive column.

[0049] (4) First, cover the top with a steel explosive transfer base plate 6 with four equally distributed grooves, press the explosive into the grooves; then cover it with a steel explosion-proof end cap 7, and insert the detonator 8 into the detonator seat on the end cap.

[0050] (5) Detonate the detonator.

[0051] Example 1: (1) Medium-strength near-α titanium alloy Ti-6.5Al-1Mo-1V-2Zr (i.e., TA15) ingots with an original yield strength of ≈860 MPa and elongation of ≈15% were selected and cut into hollow cylindrical tubes with an outer diameter of 1000 mm, a wall thickness of 100 mm, and a length of 1 m. Medium-strength α+β type titanium alloy Ti-6Al-4V (i.e., TC4) ingots with an original yield strength of ≈830 MPa and elongation of ≈15% were selected and cut into hollow cylindrical tubes with an outer diameter of 790 mm, a wall thickness of 100 mm, and a length of 1 m. The surface of the tubes was ground and polished to remove the surface oxide film and impurities, and then ultrasonically cleaned.

[0052] (2) On the rubber buffer base 1, the steel support column 2 is concentrically inserted into the TC4 and TA15 pipes. The coaxiality of the two is ensured by the inner diameter dial indicator 3. A 5mm gap is reserved between the titanium alloy pipes, and a 10mm gap is reserved between the Q345B steel column with a diameter of 570mm and the inner wall of TC4.

[0053] (3) Wrap the powdered explosive with double-layered sealing oil paper (thin inner layer and thick outer layer), tie the inner and outer ring ends tightly, and press it into an annular explosive column 4 with an inner diameter slightly larger than 1000 mm and a thickness of 5 mm using a hydraulic press. Place it on the outer layer of the TA15 pipe. Install a steel restraint structure 5 on the outermost layer of the assembled annular explosive column.

[0054] (4) First, cover the top with a 45 steel explosive transfer base plate 6 with four equally long and evenly distributed grooves, press the explosive transfer material into the grooves; then cover it with a 45 steel explosion-proof end cap 7, and insert the detonator 8 into the detonator seat on the end cap.

[0055] (5) Detonate the detonator.

[0056] Example 2 (1) Medium-strength α+β titanium alloy Ti-6.5Al-3.5Mo-1.5Zr-0.3Si (TC11) ingots with an original yield strength of ≈950 MPa and elongation of ≈13% were selected and cut into hollow cylindrical tubes with an outer diameter of 1000 mm, a wall thickness of 90 mm, and a length of 1 m. Medium-strength near-α titanium alloy Ti-5Al-2.5Sn (TC7) ingots with an original yield strength of ≈820 MPa and elongation of ≈15% were selected and cut into hollow cylindrical tubes with an outer diameter of 810 mm, a wall thickness of 110 mm, and a length of 1 m. The surface of the tubes was ground and polished to remove the surface oxide film and impurities, and then ultrasonically cleaned.

[0057] (2) On the rubber buffer base 1, the steel support column 2 is concentrically inserted into the TC11 and TC7 pipes. The coaxiality of the two is ensured by the inner diameter dial indicator 3. A 5mm gap is reserved between the titanium alloy pipes and a 5mm gap is reserved between the Q345B steel column with a diameter of 580mm and the inner wall of TC7.

[0058] (3) Wrap the powdered explosive with double-layered sealing oil paper (thin inner layer and thick outer layer), tie the inner and outer ring ends tightly, and press it into an annular explosive column 4 with an inner diameter slightly larger than 1000 mm and a thickness of 5 mm by a hydraulic press. Place it on the outer layer of the TC11 pipe. Install a steel restraint structure 5 on the outermost layer of the assembled annular explosive column.

[0059] (4) First, cover the top with a 45 steel explosive transfer base plate 6 with four equally long and evenly distributed grooves, press the explosive transfer material into the grooves; then cover it with a 45 steel explosion-proof end cap 7, and insert the detonator 8 into the detonator seat on the end cap.

[0060] (5) Detonate the detonator.

[0061] Comparative Example 1: Traditional Single-Point Detonation (1) Medium-strength near-α titanium alloy Ti-6.5Al-1Mo-1V-2Zr (i.e., TA15) ingots with an original yield strength of ≈860 MPa and elongation of ≈15% were selected and cut into hollow cylindrical tubes with an outer diameter of 1000 mm, a wall thickness of 100 mm, and a length of 1 m. Medium-strength α+β type titanium alloy Ti-6Al-4V (i.e., TC4) ingots with an original yield strength of ≈830 MPa and elongation of ≈15% were selected and cut into hollow cylindrical tubes with an outer diameter of 790 mm, a wall thickness of 100 mm, and a length of 1 m. The surface of the tubes was ground and polished to remove the surface oxide film and impurities, and then ultrasonically cleaned.

[0062] (2) On the rubber buffer base 1, the steel support column 2 is concentrically inserted into the TC4 and TA15 pipes. The coaxiality of the two is ensured by the inner diameter dial indicator 3. A 5mm gap is reserved between the titanium alloy pipes, and a 10mm gap is reserved between the Q345B steel column with a diameter of 570mm and the inner wall of TC4.

[0063] (3) Wrap the powdered explosive with double-layered sealing oil paper (thin inner layer and thick outer layer), tie the inner and outer ring ends tightly, and press it into an annular explosive column 4 with an inner diameter slightly larger than 1000 mm and a thickness of 5 mm using a hydraulic press. Place it on the outer layer of the TA15 pipe. Install a steel restraint structure 5 on the outermost layer of the assembled annular explosive column.

[0064] (4) Cover it with a 45 steel explosion-proof end cap 7 and insert the detonator 8 into the detonator socket on the end cap.

[0065] (5) Detonate the detonator.

[0066] Due to the absence of the steel explosive transfer base plate 6 in the detonation device, the annular explosive is directly ignited at a single point in the circumference of the pipe, resulting in uneven circumferential detonation energy distribution. Wavy metallurgical bonding forms locally near the detonation point, and numerous defects such as lack of fusion and microcracks appear in the lower part of the pipe. The yield strength is only 890~950MPa (average ≤930MPa), the elongation after fracture is ≤6%, and the performance difference between various measuring points in the circumference exceeds 40%. Local interface delamination fracture is prone to occur, which cannot meet the service requirements of uniform load-bearing and impact resistance in the entire circumference of the composite pipe.

[0067] Without the synchronous detonation of the explosive charge, the energy of the detonation wave attenuates significantly during its unidirectional propagation, resulting in uneven circumferential impact velocity on the outer layer of the TA15 pipe. In most areas, the impact velocity does not reach the critical collision velocity for explosive welding, making it impossible to form an effective metallurgical bond. At the same time, the unidirectional detonation causes uneven circumferential loading and deformation of the pipe, resulting in localized stress concentration, which further induces microcracks at the interface. Ultimately, this leads to technical defects such as low welding yield, poor interface bonding quality, and extremely uneven mechanical properties, highlighting the necessity and superiority of the explosive charge initiation device in this embodiment.

[0068] Comparative Example 2: Structure without Steel Constraints (1) Medium-strength near-α titanium alloy Ti-6.5Al-1Mo-1V-2Zr (i.e., TA15) ingots with an original yield strength of ≈860 MPa and elongation of ≈15% were selected and cut into hollow cylindrical tubes with an outer diameter of 1000 mm, a wall thickness of 100 mm, and a length of 1 m. Medium-strength α+β type titanium alloy Ti-6Al-4V (i.e., TC4) ingots with an original yield strength of ≈830 MPa and elongation of ≈15% were selected and cut into hollow cylindrical tubes with an outer diameter of 790 mm, a wall thickness of 100 mm, and a length of 1 m. The surface of the tubes was ground and polished to remove the surface oxide film and impurities, and then ultrasonically cleaned.

[0069] (2) On the rubber buffer base 1, the steel support column 2 is concentrically inserted into the TC4 and TA15 pipes. The coaxiality of the two is ensured by the inner diameter dial indicator 3. A 5mm gap is reserved between the titanium alloy pipes, and a 10mm gap is reserved between the Q345B steel column with a diameter of 570mm and the inner wall of TC4.

[0070] (3) Wrap the powdered explosive with double-layered sealing oil paper (thin inner layer and thick outer layer), tighten the inner and outer ring ends, and press it into an annular explosive column 4 with an inner diameter slightly larger than 1000 mm and a thickness of 5 mm using a hydraulic press. Fit it onto the outer layer of the TA15 pipe. Fix a simple plastic pipe to the outermost layer of the assembled annular explosive column.

[0071] (4) First, cover the top with a 45 steel explosive transfer base plate 6 with four equally long and evenly distributed grooves, press the explosive transfer material into the grooves; then cover it with a 45 steel explosion-proof end cap 7, and insert the detonator 8 into the detonator seat on the end cap.

[0072] (5) Detonate the detonator.

[0073] Because the steel constraint structure 5 was not installed, when the detonation charge was used to initiate the annular explosive on the outer surface of the pipe, the detonation energy was released without constraint, the detonation wave propagated erratically, and the outer layer of the TA15 pipe lost its rigid restraint, resulting in irregular plastic deformation such as bulging, wall deviation, and out-of-roundness of the pipe diameter. Only local wavy metallurgical bonding was formed, and most areas showed unwelded and microcracked areas. Furthermore, due to energy release, interface porosity and slag inclusion defects were generated. The final yield strength was 820~870MPa (average ≤850MPa), the elongation after fracture was ≤5%, and the circumferential performance difference exceeded 30%, which could not meet the requirements for dimensional accuracy and uniform load bearing in the entire circumference of the composite pipe.

[0074] Without a steel-constrained structure, the detonation energy cannot be concentrated or guided, resulting in uneven impact loads and difficulty in meeting the critical impact requirements for metallurgical bonding. Furthermore, the structure cannot restrict the plastic deformation of the pipe, causing some energy to be converted into random deformation of the pipe rather than directional impact. At the same time, the dissipated energy causes interface defects, ultimately resulting in technical defects such as low welding yield, poor interface bonding, substandard forming accuracy, and large dispersion of mechanical properties. This highlights the necessity and superiority of the steel-constrained structure in the embodiment.

[0075] Comparative Example 3: No built-in steel column support (1) Medium-strength near-α titanium alloy Ti-6.5Al-1Mo-1V-2Zr (i.e., TA15) ingots with an original yield strength of ≈860 MPa and elongation of ≈15% were selected and cut into hollow cylindrical tubes with an outer diameter of 1000 mm, a wall thickness of 100 mm, and a length of 1 m. Medium-strength α+β type titanium alloy Ti-6Al-4V (i.e., TC4) ingots with an original yield strength of ≈830 MPa and elongation of ≈15% were selected and cut into hollow cylindrical tubes with an outer diameter of 790 mm, a wall thickness of 100 mm, and a length of 1 m. The surface of the tubes was ground and polished to remove the surface oxide film and impurities, and then ultrasonically cleaned.

[0076] (2) On the rubber buffer base 1, the rubber column is concentrically inserted into the TC4 and TA15 pipes. The coaxiality of the two is ensured by the inner diameter dial indicator 3. A 5mm gap is reserved between the titanium alloy pipes, and a 10mm gap is reserved between the 570mm diameter rubber column and the inner wall of TC4.

[0077] (3) Wrap the powdered explosive with double-layered sealing oil paper (thin inner layer and thick outer layer), tie the inner and outer ring ends tightly, and press it into an annular explosive column 4 with an inner diameter slightly larger than 1000 mm and a thickness of 5 mm using a hydraulic press. Place it on the outer layer of the TA15 pipe. Install a steel restraint structure 5 on the outermost layer of the assembled annular explosive column.

[0078] (4) First, cover the top with a 45 steel explosive transfer base plate 6 with four equally long and evenly distributed grooves, press the explosive transfer material into the grooves; then cover it with a 45 steel explosion-proof end cap 7, and insert the detonator 8 into the detonator seat on the end cap.

[0079] (5) Detonate the detonator.

[0080] Because rubber columns are used as the foundation support instead of steel support columns 2, the inner layer of the TC4 pipe undergoes plastic deformation with inward concavity and uneven wall thickness due to impact from the outer layer. The coaxiality deviation of the pipe is large, and only a local area forms an effective wavy metallurgical bond. In most areas, interface gaps and incomplete fusion defects occur due to the deformation and misalignment of the inner layer. The yield strength is only 870~920MPa (average ≤890MPa) and the elongation after fracture is ≤6%, which cannot meet the service requirements of the composite pipe for dimensional accuracy and uniform interface bonding.

[0081] The rubber support cannot provide rigid internal support for the inner tube of TC4. When subjected to high-speed impact from the outer layer, it is difficult to maintain its structural shape and undergoes irregular concave deformation. This leads to misalignment of the inner and outer tubes during impact and uneven interface gaps, making it impossible to form stable metallurgical bonding conditions. Ultimately, this results in low welding yield, poor interface bonding quality, and substandard tube shape and mechanical properties. This highlights the necessity and superiority of the built-in steel column support in ensuring the shape of the inner tube, achieving precise impact between the inner and outer tubes, and improving the interface bonding quality.

[0082] If the device is placed directly on a rigid ground without the rubber buffer base 1, the reflected stress wave will be superimposed on the positive loading wave, causing distortion of the interface bonding quality; without the buffer layer, the bottom of the pipe lacks stable support.

[0083] If there is no steel support column 2 and only rubber columns are used instead of steel support columns, the second titanium alloy pipe B will undergo plastic deformation with inward concavity and uneven wall thickness due to the impact of the outer layer. The coaxiality deviation of the pipe is large, and only a wavy joint is formed in a local area. In most areas, there are problems such as interface gaps, lack of fusion, and decreased elongation after fracture.

[0084] If the implosion method is used, the explosive is filled inside the inner tube and detonated outwards, which has the following drawbacks: the charging space is limited by the inner tube diameter, the range of explosive quantity adjustment is limited, and it is difficult to meet the energy requirements of large-size composite pipes; the inner cavity charging operation space is small, and the uniformity of the charging is difficult to guarantee, which easily leads to uneven distribution of circumferential detonation energy; the detonation wave propagates from the inside to the outside, and the inner tube is subjected to huge radial expansion stress, which is prone to plastic deformation or even rupture failure; the detonation products need to be discharged from the inner cavity, which requires a special exhaust channel, which is complex in structure, and when the exhaust is not smooth, defects such as pores and inclusions are easily formed at the interface.

[0085] Without the steel constraint structure 5, and only a simple plastic tube fixed around the annular explosive charge 4, the detonation energy dissipates without constraint, and the detonation wave propagates erratically; the first titanium alloy tube A undergoes irregular deformations such as bulging, wall deviation, and out-of-roundness; pores and slag inclusions appear at the interface between the first titanium alloy tube A and the second titanium alloy tube B; the yield strength of the composite component decreases after welding, the elongation after fracture decreases significantly, and the circumferential performance difference is too large.

[0086] Without the steel charge transfer substrate 6 and the groove and detonation hole structure, the annular explosive is directly ignited at a single point in the circumference of the pipe: the circumferential detonation energy distribution is uneven, with local wavy bonding near the detonation point and no fusion or microcracks at the far end; the energy of the detonation wave propagates unidirectionally and is greatly attenuated, with most areas not reaching the critical collision velocity; single-point detonation causes the detonation wave to spread spherically, and the time and incident angle to reach the outer wall of the pipe are inconsistent along the axial and circumferential directions, and the pipe is subjected to asymmetrical oblique loading.

[0087] Without the steel explosion-proof end cap 7, if the detonator 8 is directly inserted into the explosive column or fixed in an exposed position, part of the detonation energy will dissipate upwards, and there is a safety hazard of fragments flying out.

[0088] Results Analysis Figure 1This is a schematic diagram of the explosive composite strengthening and toughening device for coaxial titanium alloy tubes in Embodiment 1 of the present invention. A rubber buffer base 1 is used for support and buffering; a first titanium alloy tube A and a second titanium alloy tube B are coaxially fitted together, with a 2-5mm gap between them; a steel support column 2, concentrically fitted inside the two titanium alloy tubes, has a diameter >300mm and a 5-10mm gap with the inner wall of the second titanium alloy tube B; an inner diameter dial indicator 3 is used to check the coaxiality of the two titanium alloy tubes; an annular explosive charge 4, made of powdered explosive wrapped in double-layered sealing oil paper and hydraulically pressed, is fitted onto the outer layer of the first titanium alloy tube A; a steel constraint structure 5 is set on the outermost layer of the annular explosive charge 4; as shown... Figure 2 As shown, the steel explosive transfer base plate 6 has at least four equally distributed grooves engraved on its top, and explosive transfer charges are pressed into the grooves; the steel explosion-proof end cap 7 is set above the steel explosive transfer base plate 6 and has a detonator seat; the detonator 8 is inserted into the detonator seat and is used to detonate the explosive transfer charges.

[0089] Experimental results show that the comprehensive mechanical properties of the high-strength titanium alloy composite pipe of this invention are significantly improved. Its yield strength reaches 1210±20 MPa, and the elongation decreases slightly from approximately 15% to 12.1±1%, a reduction of less than 20%, which is within an acceptable plastic range, enabling the overall mechanical properties of the pipe to reach the level of high-strength titanium alloys. Compared with existing titanium alloy welded composites, the pipe prepared in this study has a higher elongation at a similar yield strength; and at a similar elongation, its yield strength is more advantageous, achieving a good balance between strength and plasticity, and significantly improving the comprehensive mechanical properties.

[0090] like Figure 3 As shown, TEM characterization results indicate that a large number of high-density dislocations are generated in the composite interface region under the action of a strong explosive pulse. At low magnification, the overall distribution of dislocations is relatively uniform, with no obvious local dislocation aggregation or pile-up. At high magnification, a typical dislocation-like cell structure is observed inside the material, accompanied by a large number of dislocation entanglements. During high strain rate deformation, dislocations multiply and interact, entangle, and rearrange, forming an intracellular structure composed of a cell wall consisting of high dislocation density regions and low dislocation density regions. This non-uniformly distributed dislocation substructure effectively hinders dislocation movement, producing a significant dislocation strengthening effect and providing important microscopic mechanism support for the overall strengthening and toughening of the material.

[0091] The technical effects achieved by this invention are as follows: During the explosion process, the high-quality metallurgical bonding of the titanium alloy interface and the microstructure reconstruction of the pipe body are completed simultaneously. While significantly improving the interfacial bonding force, the comprehensive mechanical properties of the pipe are improved through dislocation strengthening. This breaks through the technical limitation of traditional explosive composites, which can only achieve interfacial bonding and cannot strengthen the matrix. Moreover, while significantly improving the yield strength of the material, the elongation reduction is controlled within 20%, which is far superior to the drawback of traditional strengthening technology that "improves strength but damages plasticity". This truly achieves the synergistic optimization of high strength and high plasticity.

[0092] Explosive explosions can generate ultra-high pressure, high strain rate shock waves with energy density far exceeding that of traditional industrial processing equipment. Moreover, the explosion energy is positively correlated with the charge amount. During processing, the required energy can be precisely matched by adjusting the charge amount. There are no rated load limitations of traditional equipment. The load adjustment range is large and the adaptability is strong, which can meet the processing energy requirements of large-diameter and long-length titanium alloy composite pipes.

[0093] By arranging explosives around the components, the explosive shock wave is uniformly and synchronously loaded onto the tubular components from a 360° direction, effectively solving the problems of uneven load distribution and inconsistent deformation in traditional processing. At the same time, relying on the stress characteristics of the tubular structure, the shock wave is allowed to penetrate the wall thickness evenly, achieving overall uniform strengthening of the pipe from the outside to the inside, and ensuring the consistency of component performance.

[0094] The innovative external charging structure eliminates the strict limitations of internal charging on the internal space of the tube, making the charging, sealing and constraint processes simpler and significantly improving process controllability. It can effectively suppress defects such as component bulging, deformation and cracking, significantly improve the product yield, and at the same time ensure the interface bonding quality and tube forming accuracy.

[0095] Explosive strengthening can complete all processes of composite, strengthening and forming in a single explosion, without the need for multiple processing steps. The process is greatly simplified, and the processing efficiency and time cost are significantly better than traditional strengthening processes. Moreover, the process can be carried out in outdoor sites, without being limited by the working space and clamping capacity of traditional equipment. It can achieve seamless integral strengthening of large-diameter and long-length titanium alloy composite pipes, breaking through the processing bottleneck of large-size components.

[0096] The overall process system is simple, and the equipment investment, operation and maintenance costs are far lower than those of traditional large-scale processing equipment, resulting in better overall economic performance. At the same time, the process is highly replicable, has a low operating threshold, does not require complex customized chemical equipment, and is easy to achieve industrialized mass production and application.

[0097] It should be noted that when numerical ranges are involved in this invention, it should be understood that both endpoints of each numerical range and any value between the two endpoints can be selected. Since the steps and methods used are the same as in the embodiments, preferred embodiments are described here to avoid redundancy. Although preferred embodiments of the invention have been described, those skilled in the art, once they understand the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this invention.

[0098] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An explosive composite device for a titanium alloy coaxial tubular fitting, characterized in that, include: Rubber buffer base (1) is used for support and cushioning; A steel support column (2) is installed at the bottom on a rubber buffer base (1) to support a second titanium alloy tube (B) and a first titanium alloy tube (A) that are coaxially arranged on its outer side in sequence. The inner diameter dial indicator (3) is used to measure the coaxiality of the second titanium alloy tube (B), the steel support column (2) and the first titanium alloy tube (A); The annular explosive charge (4) is made of powder emulsion explosive wrapped in double-layer sealed oil paper and hydraulically pressed, and is fitted on the outer layer of the first titanium alloy tube (A); A steel confinement structure (5) is set on the outermost layer of the annular medicament (4); The steel explosive transfer base plate (6) has multiple uniform and equal-length grooves (6-1) engraved around its center as the center of symmetry. Explosive transfer charge is press-fitted into the grooves. Each groove (6-1) has an explosive transfer hole (6-2) that penetrates the steel explosive transfer base plate (6) at the other end. Below the explosive transfer hole (6-2) is the top surface of the annular explosive column (4). A steel explosion-proof end cap (7) is set above a steel drug transfer substrate (6), and a detonator seat is provided at the corresponding position in the center of the steel drug transfer substrate (6). Detonator (8) is inserted into the detonator holder to detonate the explosive charge.

2. The explosive composite device for titanium alloy coaxial tubular fittings according to claim 1, characterized in that, The groove depth of the steel explosive transfer substrate (6) is 5mm~15mm, the width is 10mm~20mm, the explosive transfer material is terane or RDX, and the packing density is 1.5g / cm³. 3 ~1.7g / cm 3 .

3. The explosive composite device for titanium alloy coaxial tubular fittings according to claim 1, characterized in that, There are at least four trenches (6-1).

4. The explosive composite device for titanium alloy coaxial tubular fittings according to claim 1, characterized in that, The gap between the first titanium alloy tube (A) and the second titanium alloy tube (B) is 2mm to 5mm; A gap of 5mm to 10mm is reserved between the steel support column (2) and the inner wall of the second titanium alloy tube (B).

5. The explosive composite device for titanium alloy coaxial tubular fittings according to claim 1, characterized in that, The first titanium alloy tube (A) is an α+β type titanium alloy, and the second titanium alloy tube (B) is a near-α type titanium alloy; the dimensions of the first titanium alloy tube (A) and the second titanium alloy tube (B) are: outer diameter < 1000 mm, wall thickness < 150 mm, and length < 1500 mm.

6. The explosive composite device for titanium alloy coaxial tubular fittings according to claim 1, characterized in that, The steel explosion-proof end cap (7) and the steel restraint structure (5) are connected by threads or flanges.

7. The explosive bonding method of the explosive bonding device for titanium alloy coaxial tubular fittings according to claim 1, characterized in that, Includes the following steps: The first titanium alloy tube (A) and the second titanium alloy tube (B) are coaxially fitted onto the outside of the steel support column (2) on the rubber buffer base (1); the coaxiality is measured with an inner diameter dial indicator (3); A non-porous annular propellant column (4) is fitted on the outer circumferential surface of the first titanium alloy tube (A), and a steel constraint structure (5) is provided on the outer circumferential surface of the annular propellant column (4). A steel propellant transfer substrate (6) is first placed on top of the steel support column (2), the first titanium alloy tube (A), the second titanium alloy tube (B), the annular propellant charge (4), and the steel constraint structure (5). The upper surface of the steel propellant transfer substrate (6) is uniformly engraved with multiple grooves of equal length and evenly distributed. Each groove has a detonation hole that penetrates the steel propellant transfer substrate (6) at its outer end. The multiple detonation holes are all directly opposite the top surface of the annular propellant charge (4) on the outer wall of the first titanium alloy tube (A) below. Propellant is evenly arranged in the grooves so that the propellant communicates with the annular propellant charge (4) through the multiple detonation holes. The steel explosion-proof end cap (7) is placed on top of the steel explosive transfer substrate (6), and the detonator (8) is inserted into the center of the steel explosion-proof end cap (7). The bottom end of the detonator (8) is located at the intersection of the four grooves. After the detonator (8) is detonated, the detonation wave propagates outward through the explosive transfer material in the groove and detonates the annular explosive column (4) downward through multiple detonation holes. The strong pulse shock wave generated by the explosion drives the first titanium alloy tube (A) to collide with the second titanium alloy tube (B) at high speed, thereby achieving metallurgical bonding and synchronous strengthening of the two.

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