Metal composite plate explosive welding device and method for reducing interface defects

Abstract

The invention relates to the technical field of metal composite plate explosive welding, in particular to a metal composite plate explosive welding device and method for reducing interface defects, the device is used for maintaining a uniform distance between a base plate and a compound plate, and the device comprises a rigid structure, a fixing block, a reinforcing connecting piece and a support; the compound plate and the rigid structure form an integrated structure through the fixing block and the reinforced connecting piece, and the integrated structure is used for fixing the compound plate and keeping the horizontal plane of the compound plate; the supports are arranged on the periphery of the base plate, and the ends, away from the base plate, of the supports are connected with the compound plate and used for supporting the compound plate and limiting the distance between the base plate and the compound plate. The compound plate is fixed and kept in a horizontal plane through the rigid structure, the gap between the base plate and the compound plate can be kept to meet the design requirement only by placing the supports on the periphery of the base plate, and therefore the large-area explosive metal compound plate with the unsupported bonding interface is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of metal composite plate explosion welding, and in particular to a metal composite plate explosion welding device and method for reducing interface defects. Background Art

[0002] Explosive welding, also known as explosive bonding, is a material explosive processing technology that uses explosives as energy. Under the impact of the explosive explosion, two or more metals collide at high speeds, thereby producing metallurgical bonding between the metal bodies. The explosive welding interface is usually a regular wave interface, which has the advantages of large bonding area and strong bonding.

[0003] Explosive welding is often used in the manufacture of large-area dissimilar metal composite panels. When using explosive welding to manufacture large-area metal composite panels, an installation gap is required between the composite layer and the base layer to ensure that the composite plate obtains a suitable collision speed under the impact of the explosive explosion. The installation gap should be uniform to ensure that the collision speed is stable and conducive to the smooth discharge of gas in the gap between the base and composite plates. Before explosive welding, suitable metal objects are usually used for support between the base and composite plates. After the explosion, the metal object remains between the base and composite plates and forms a "comet tail"-shaped support influence zone. Interface observation and bonding tests show that the interface waveform of the support influence zone is disordered or even disappears, and a layer of molten support metal is covered on the interface. The shear strength and separation strength of the support influence zone are significantly reduced. Interface cracking often occurs during bending tests, and obvious point or line defects often appear in the support influence zone during color penetration testing. Therefore, the support influence zone is an explosive welding bonding interface defect with adverse effects.

[0004] For metal composite plates with high requirements on interface bonding quality, such as dissimilar metal composite tube sheets and dissimilar metal transition joints, the existence of the support influence zone will affect the manufacturing and operation reliability. For example, when welding the heat exchange tube sheet, local cracking of the composite interface often occurs, or cracking and leakage of the composite interface occurs during the water pressure test after welding, and even local interface stratification, expansion and penetration may occur during the operation of the equipment, causing operation accidents.

[0005] Therefore, it is urgent to propose an explosive welding method for reducing interface defects, that is, combining metal composite plates without support at the interface, so as to solve the problem of obviously insufficient mechanical properties of the support influence zone in the existing explosive welding technology. Summary of the invention

[0006] In view of this, the present invention aims to propose a metal composite plate explosion welding device and method for reducing interface defects, so as to solve the problem of obviously insufficient mechanical properties of the support influence zone in the existing explosion welding technology.

[0007] In the traditional large-area explosion metal composite panel manufacturing process, due to the large area of ​​the metal composite panel, the entire explosion area can reach up to 50m2 , usually 1-20m 2 .

[0008] After the composite plate is suspended in the air, the middle part is prone to sag under the action of gravity. Usually, a large number of metal supports need to be placed between the base plate and the composite plate to ensure the distance between the two. These supports not only increase the complexity of the process, but may also have an adverse effect on the quality of the bonding interface. The present invention realizes the installation method without intermediate supports by designing a large-area composite plate integral fixing tool, simplifies the process flow, and improves product quality.

[0009] The composite plate and the rigid structure are connected into an integrated structure using fixed blocks and reinforced connectors. This design helps maintain the stability of the composite plate during the explosion process, while reducing the use of additional supports, making the bonding interface after the explosion more uniform and flat. Providing supports only around the base plate, rather than evenly distributing support points across the entire plate surface, can effectively avoid problems caused by intermediate supports, such as stress concentration and interface defects, thereby improving the quality of explosive welding.

[0010] Post-processing steps include heat treatment, leveling, and cutting off the boundary effect area, which further ensure the quality of the final product. In particular, the treatment of the peripheral abnormal thinning area, the poor bonding area, and the support-affected area reflects the attention to detail and the pursuit of technical excellence.

[0011] In general, compared with the traditional explosive welding method, this technical solution has obvious innovation and progressive significance in reducing the use of support parts and improving product quality. It solves several problems existing in the existing technology and provides new ideas and technical means for the manufacture of large-area explosive metal composite panels.

[0012] The technical solution of the present invention is achieved in this way:

[0013] The present invention discloses a metal composite plate explosion welding device for reducing interface defects, which is used to maintain a uniform distance between a base plate and a composite plate, and includes a rigid structure, a fixing block, a reinforcing connector and a support;

[0014] The doubler plate and the rigid structure form an integrated structure through the fixing block and the reinforcing connector, which is used to fix the doubler plate and keep the doubler plate in a horizontal plane;

[0015] The support is arranged at the periphery of the substrate, and one end of the support away from the substrate is connected to the doubler plate, so as to support the doubler plate and limit the distance between the substrate and the doubler plate.

[0016] Furthermore, the rigid structure is one of a T-beam, a rectangular frame, a truss structure, an I-beam or a multi-point support platform.

[0017] Furthermore, a plurality of the fixing blocks are arranged at the edge of the doubler plate, one end of the fixing block is connected to the doubler plate, and one end of the fixing block away from the doubler plate is connected to the rigid structure.

[0018] Furthermore, the fixing block and the composite plate, and the fixing block and the rigid structure are connected by welding.

[0019] Furthermore, the fixing block is a rod-shaped or block-shaped structure, and the cross-sectional area range of the fixing block is: 50-1000 mm².

[0020] Furthermore, two ends of the reinforcing connector are respectively connected to the composite plate and the rigid structure, and a plurality of the reinforcing connectors are evenly distributed in the middle of the composite plate.

[0021] Furthermore, one end of the reinforcing connector is fixedly connected to the composite plate, and one end of the reinforcing connector away from the composite plate is adjustably connected to the rigid structure to adjust the distance between the middle of the composite plate and the rigid structure and ensure the horizontality of the composite plate.

[0022] Furthermore, the reinforcing connector is a metal wire, and the diameter range of the reinforcing connector is 1-5 mm.

[0023] Another object of the present invention is to disclose a method for explosive welding of metal composite plates with reduced interface defects, which is used to manufacture any of the above-mentioned explosive welding devices for metal composite plates with reduced interface defects, and comprises the following specific steps:

[0024] S1: placing the surface-treated composite plate on the surface-treated substrate and making the two closely contact;

[0025] S2: welding the fixing block to the edge of the doubler plate, and welding the rigid structure to an end of the fixing block away from the doubler plate;

[0026] S3: vertically spot-weld one end of the reinforcing connector to the surface of the doubler plate, and under the condition that the doubler plate 3 and the base plate 2 are in close contact, tighten the end of the reinforcing connector away from the doubler plate and vertically tie it to the rigid structure;

[0027] S4: lift the doubler plate, place the supports around the base plate, and then place the doubler plate steadily on the supports;

[0028] S5: After placing a surrounding frame around the double plate, spread explosives on the double plate, and place a detonator on one side of the double plate that intersects the perpendicular bisector of the rigid structure;

[0029] S6: detonating the detonator to obtain an explosive composite slab;

[0030] S7: After heat treatment, leveling and ultrasonic testing of the explosive composite slab, the peripheral boundary effect area is cut off, and finally a large-area explosive metal composite plate with a middle unsupported influence area is obtained.

[0031] Compared with the prior art, the metal composite plate explosion welding device and method for reducing interface defects of the present invention have the following advantages:

[0032] 1. The present invention fixes the composite plate and maintains a horizontal plane through a rigid structure, and only needs to place supports around the base plate to keep the gap between the base plate and the composite plate to meet the design requirements, thereby obtaining a large-area explosive metal composite plate with no support on the bonding interface.

[0033] 2. The present invention can eliminate the adverse effects of the interface support area by bonding the metal composite plate with no support at the interface, and can meet certain specific needs with strict quality requirements on the bonding interface, such as large-area titanium-steel tube plates for heat exchangers, marine aluminum-steel transition joints, and multi-layer composite joints for low-temperature fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0035] Figure 1 This is a schematic diagram of the structure of the explosive welding device of the present invention;

[0036] Figure 2 It is a front view of the explosion welding device of the present invention;

[0037] Figure 3 It is a top view of the explosive welding device of the present invention;

[0038] Figure 4 This is a partial enlarged view of the explosion welding device of the present invention.

[0039] Description of reference numerals:

[0040] 1. Base plate; 2. Composite plate; 3. Rigid structure; 4. Fixed block; 5. Reinforced connector;

[0041] 6. Support; 7. Sand foundation; 8. Frame; 9. Explosives; 10. Detonator. DETAILED DESCRIPTION

[0042] In order to make the technical means, objectives and effects of the present invention easy to understand, the embodiments of the present invention are described in detail below with reference to specific drawings.

[0043] It should be noted that all the terms used in the present invention to indicate directionality and positionality, such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside", "top", "lower", "lateral", "longitudinal", "center", etc., are only used to explain the relative positional relationship and connection status between the components in a certain state, and are only for the convenience of describing the present invention, rather than requiring the present invention to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0044] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0046] An object of the present invention is to disclose a metal composite plate explosion welding device for reducing interface defects, which is used to maintain a uniform distance between a base plate 1 and a composite plate 2, and includes a rigid structure 3, a fixing block 4, a reinforcing connector 5 and a support 6;

[0047] The doubler plate 2 and the rigid structure 3 form an integrated structure through the fixing block 4 and the reinforcing connector 5, which are used to fix the doubler plate 2 and keep the doubler plate 2 in a horizontal plane;

[0048] The support 6 is disposed around the substrate 1 , and one end of the support 6 away from the substrate 1 is connected to the composite plate 2 , so as to support the composite plate 2 and limit the distance between the substrate 1 and the composite plate 2 .

[0049] The device forms an integrated structure by integrating the composite plate 2 and the rigid structure 3 through the fixing block 4 and the reinforcing connector 5, so that the composite plate 2 can be firmly maintained in a predetermined position and plane. The supports 6 arranged around the base plate 1 ensure that the specified gap between the composite plate 2 and the base plate 1 can be maintained after the base composite plate is installed and the medicine is applied, thereby effectively reducing the occurrence of interface defects. The rigid structure 3 provides a stable support frame for the composite plate 2, and is used in conjunction with the fixing block 4 to accurately fix the composite plate 2. The two ends of the reinforcing connector 5 are respectively connected to the composite plate 2 and the rigid structure 3, so that the composite plate 2 maintains its horizontal state and avoids bending of the composite plate 2. The supports 6 are arranged around the base plate 1 to support the composite plate 2 and ensure that the correct gap is maintained between the two.

[0050] The present invention realizes an installation method without intermediate supports by designing an integral fixing tool for a large-area composite plate 2, which can effectively avoid problems such as stress concentration and interface defects caused by the intermediate supports, thereby improving the quality of explosive welding.

[0051] Specifically, the rigid structure 3 is one of a T-beam, a rectangular frame, a truss structure, an I-beam or a multi-point support platform.

[0052] The T-beam provides a stable support frame to ensure that the doubler plate 2 remains horizontal and flat after the base plate is installed and the explosives are laid. It has a simple structure and is easy to manufacture and install. It provides sufficient strength and stability and can withstand the weight of the larger doubler plate 2 and the weight of the explosives 9. It also helps to disperse stress and reduce local deformation.

[0053] The rectangular frame forms a closed or semi-closed support system, which enhances the stability and rigidity of the overall structure, is suitable for application scenarios that require greater stability, can better resist lateral forces, prevent the doubler plate 2 from shifting, and is easy to integrate with the fixing block 4 and other components, thereby improving assembly efficiency.

[0054] The truss structure provides extremely high strength and stability through a spatial structure composed of multiple triangular units. It has a high strength-to-weight ratio and is suitable for large-size or high-demand welding tasks. At the same time, it can evenly distribute the load, reduce local stress concentration, and has good bending and torsion resistance, ensuring the precise position of the composite plate 2 after the base composite plate is installed and the medicine is laid.

[0055] I-beams are similar to T-beams, but have a larger section moment of inertia, provide stronger bending resistance, and are suitable for situations where they carry larger loads, such as welding of thick plates or large-area composite plates. The cross-sectional shape helps to improve shear resistance and compressive strength, and can maintain the flatness and position accuracy of the composite plate 2 during explosive welding.

[0056] The multi-point support platform fixes the composite plate 2 through multiple independent support points to ensure uniform force on the entire surface, providing more flexible adjustment options. It can be adaptively configured according to composite plates 2 of different sizes and shapes, reducing the pressure on a single support point and the risk of local deformation. The distance between the support points can be optimized according to specific needs to improve the welding quality.

[0057] This setting can adapt to different welding task requirements, material properties and expected application environments, and has good application effects.

[0058] Specifically, a plurality of fixing blocks 4 are arranged at the edge of the doubler plate 2 , one end of the fixing block 4 is connected to the doubler plate 2 , and one end of the fixing block 4 away from the doubler plate 2 is connected to the rigid structure 3 .

[0059] By evenly fixing the edge of the doubler plate 2, the fixing block 4 helps to disperse the stress applied to the doubler plate 2, reduce local stress concentration, and thus avoid interface defects caused by uneven stress. The fixing block 4 connects the doubler plate 2 and the rigid structure 3 to form an integrated structure, which can enhance the overall structural rigidity of the doubler plate 2, make the rigid structure 3 a horizontal reference for the doubler plate 2, maintain the stability of the distance between the two, and prevent the two from being separated or shifted after the base doubler plate is installed and the medicine is laid.

[0060] The fixing block 4 is arranged to connect the composite plate 2 with the rigid structure 3, which can provide stable support and precise positioning, and the explosion welding process is more reliable. It can be adjusted according to composite plates 2 of different sizes and shapes, has good versatility and adaptability, and is suitable for the manufacture of various metal composite plates.

[0061] Preferably, the fixing blocks 4 are symmetrically arranged in pairs with the center line of the double plate 2 as the axis.

[0062] Specifically, the fixing block 4 and the composite plate 2, and the fixing block 4 and the rigid structure 3 are connected by welding or the like.

[0063] Welding can provide very high mechanical strength to ensure a firm connection between the fixing block 4 and the composite plate 2 and the rigid structure 3. Welding forms a metallurgical bond, which makes the connection part have good durability and fatigue resistance and will not easily loosen or fail.

[0064] Specifically, the fixing block 4 is a rod-shaped or block-shaped structure, and the cross-sectional area of ​​the fixing block 4 ranges from 50 to 1000 mm².

[0065] The rod-shaped fixing block 4 can withstand a large bending moment, ensuring that the composite plate 2 will not be deformed after the base composite plate is installed and the medicine is laid, and it occupies a small space. Compared with the block structure, the rod-shaped fixing block 4 is usually lighter, which helps to reduce the weight of the overall device. At the same time, it is simple to manufacture, uses less material, and reduces production costs.

[0066] The block-shaped fixing block 4 provides a larger contact area, ensuring uniform pressure distribution between the doubler plate 2 and the rigid structure 3. The larger contact surface helps to improve the stability and reliability of the connection part. The large contact area can effectively disperse the stress applied to the doubler plate 2, reduce local stress concentration, and prevent interface defects. In addition, the large contact area improves the welding reliability of the fixing block 4 and enhances the fixing effect, especially when higher connection strength is required.

[0067] This setting can not only ensure the stability and reliability of the fixing block 4 after the base plate is installed and the medicine is placed, but also flexibly adjust the design according to specific application requirements, thereby improving welding quality and production efficiency.

[0068] Specifically, two ends of the reinforcing connector 5 are respectively connected to the composite plate 2 and the rigid structure 3 , and a plurality of reinforcing connectors 5 are evenly distributed in the middle of the composite plate 2 .

[0069] By arranging a plurality of reinforcing connectors 5 in the middle of the composite plate 2, the reinforcing connector 5 not only plays a connecting role, but also provides additional support for the composite plate 2, especially in the welding of large-area composite plates, it helps to maintain a uniform gap between the composite plate 2 and the base plate 1, and can effectively maintain the flatness of the composite plate 2 after the base plate is installed and the medicine is laid, preventing it from bending or deformation, thereby ensuring the welding quality.

[0070] The design of setting the enhanced connector 5 connects the composite plate 2 and the rigid structure 3 at both ends, and evenly distributes multiple connectors in the middle of the composite plate 2, which not only significantly improves the connection strength and the uniformity of stress distribution, but also effectively maintains the flatness and overall stability of the composite plate 2.

[0071] Preferably, six reinforcing connectors 5 are provided, and the six reinforcing connectors 5 are arranged in two rows. The reinforcing connectors 5 are arranged at 1 / 4, 1 / 2, and 3 / 4 along the width direction of the composite plate 2.

[0072] The six reinforcing connectors 5 are arranged at 1 / 4, 1 / 2, and 3 / 4 along the width direction of the composite plate 2, ensuring uniform distribution of stress on the entire composite plate 2 and reducing local stress concentration. By arranging the reinforcing connectors 5 at key positions 1 / 4, 1 / 2, and 3 / 4, multiple support points are provided, which can effectively prevent the composite plate 2 from bending or deforming after the base composite plate is installed and the medicine is laid, ensuring that it always remains horizontal and planar, maintaining a uniform gap between the composite plate 2 and the base plate 1, and ensuring consistency of welding quality.

[0073] The uniform connection layout of this setup ensures that each weld point is under the same conditions, thereby improving the consistency and reliability of the welding results and greatly reducing the probability of defects such as cracks and lack of fusion during the welding process.

[0074] Specifically, the reinforcing connector 5 is fixedly connected to the composite plate 2, and the reinforcing connector 5 is adjustable to the rigid structure 3, such as a slide rail connection, a slot connection, a hinge connection, a bundling connection, etc., to adjust the distance between the composite plate 2 and the rigid structure 3 and ensure the horizontality of the composite plate 2.

[0075] The fixed connection ensures high strength and stability between the reinforcing connector 5 and the composite plate 2, while the adjustable connection provides flexibility and convenience, which helps to adjust the distance between the composite plate 2 and the rigid structure 3 and ensure the horizontality of the composite plate 2. The combination of the two realizes the optimal stress transfer path.

[0076] Preferably, the reinforcing connector 5 is connected to the composite plate 2 by welding.

[0077] Welding provides very high mechanical strength, ensuring a firm connection between the reinforcing connector 5 and the doubler plate 2, preventing displacement or separation after the base doubler plate is installed and the drug is applied.

[0078] Preferably, the reinforcing connecting member 5 and the rigid structure 3 are bundled together.

[0079] Bundling is a simple and economical connection method, especially suitable for temporary fixation or frequent adjustment. Bundling can use different types of materials, such as steel wire, belt, etc., according to actual needs. Moreover, bundling connection is easy to install and disassemble quickly, simplifies the operation process, is low in cost, and is suitable for small and medium-sized applications.

[0080] Specifically, the reinforcing connector 5 is a metal wire, and the diameter of the reinforcing connector 5 is in the range of 1-5 mm.

[0081] The reinforcing connector 5 is made of high-strength metal wire, such as stainless steel wire, titanium alloy wire, etc., which can be melt-welded with the material of the composite plate 2. The diameter of the metal wire should be within a reasonable range, such as from 1 mm to 5 mm. A smaller diameter is suitable for lightweight design and reduced material use, while a larger diameter can provide higher strength and stability.

[0082] By setting the reinforcing connector 5 as a metal wire with a diameter ranging from 1 mm to 5 mm, and connecting it to the composite plate 2 by fixed connection such as welding, and realizing adjustable connection with the rigid structure 3 by means of slide rail connection, slot connection, hinge connection, bundling connection, etc., this design not only significantly improves the connection strength and uniformity of stress distribution, but also provides great flexibility and convenience.

[0083] Preferably, the reinforcing connector 5 is made of the same metal welding wire as the composite plate material.

[0084] The reinforcing connector 5 can provide sufficient mechanical strength to ensure a firm connection between the composite plate 2 and the rigid structure 3 .

[0085] Specifically, the reinforcing connecting piece 5 is made of titanium or titanium alloy.

[0086] Using titanium and titanium alloy as welding wire can ensure a firm connection between the composite plate 2 and the rigid structure 3 .

[0087] Specifically, the base plate 1 is placed on a level sand foundation 7 .

[0088] The sand foundation 7 can evenly disperse the weight of the substrate 1, prevent local stress concentration, and ensure that the substrate 1 remains level and stable throughout the welding process. At the same time, the sand has good vibration reduction performance, which can absorb and attenuate external vibrations, reduce the impact of these vibrations on the welding process, and improve the welding quality. The sand foundation 7 can fine-tune the levelness of the substrate 1 by simply leveling or adding sand to ensure its uniform gap in the entire width direction. Compared with the rigid foundation, the sand foundation 7 provides a larger adjustment range to accommodate substrates 1 of different sizes and shapes. Huge impact forces will be generated during explosive welding, and the sand foundation 7 can effectively absorb and disperse these impact energies to protect the substrate 1 and other equipment from damage. The soft nature of the sand can reduce the rebound effect after the explosion, reduce the risk of relative displacement between the composite plate 2 and the substrate 1, and thus improve the quality of the welded joint.

[0089] Another object of the present invention is to disclose a method for explosive welding of metal composite plates with reduced interface defects, based on the above-mentioned welding device, comprising the following specific steps:

[0090] S1: placing the surface-treated composite plate 2 on the surface-treated substrate 1 and making the two closely contact;

[0091] S2: Weld the fixing block 4 to the edge of the doubler plate 2, and weld the rigid structure 3 to the end of the fixing block 4 away from the doubler plate 2;

[0092] S3: vertically spot weld one end of the reinforcing connector 5 to the surface of the doubler plate 2, and under the condition that the doubler plate 2 and the base plate 1 are in close contact, tighten the end of the reinforcing connector 5 away from the doubler plate 2 and vertically tie it to the rigid structure 3;

[0093] S4: lift the doubler plate 2, place the support 6 around the base plate 1, and then place the doubler plate 2 steadily on the support 6;

[0094] S5: After placing a frame 8 around the double plate 2, spread explosives 9 on the double plate 2, and place a detonator 10 on one side of the double plate 2 that intersects the perpendicular bisector of the rigid structure 3;

[0095] S6: detonating the detonator 10 to obtain an explosive composite slab;

[0096] S7: After heat treatment, leveling and ultrasonic testing of the explosive composite slab, the peripheral boundary effect area is cut off, and finally a large-area explosive metal composite plate with a middle unsupported influence area is obtained.

[0097] By precisely controlling the distance and position between the composite plate 2 and the base plate 1, the probability of interface defects such as cracks and lack of fusion is reduced. Reasonable fixing and support design ensures uniform distribution of stress and improves the quality and strength of the welded joint. The design of the fixing block 4, the reinforcing connector 5 and the support 6 ensures the stability and flatness of the composite plate 2 after the base plate is installed and the explosives are laid, and improves the reliability and repeatability of the process. The combination of the sandy foundation 7 and the support 6 effectively absorbs and disperses the impact energy generated by the explosion, protecting the safety of equipment and personnel.

[0098] The setup is based on a well-designed welding device, which ensures uniform gap and stable contact between the composite plate 2 and the base plate 1 through a series of specific steps. This method not only significantly improves the welding quality and process reliability, but also simplifies the assembly process, reduces costs, and increases the safety and versatility of the device. The resulting large-area explosion metal composite plate with an unsupported middle affected zone has high quality and high reliability, which is very suitable for application scenarios that require high-precision and high-quality welding, providing a better solution for industrial applications. Example 1

[0099] Metal composite plate explosive welding device and method for reducing interface defects

[0100] The base plate 1 is a stainless steel plate, the composite plate 2 is a titanium metal plate, the rigid structure 3 is a rigid T-shaped beam, the fixing block 4 is a metal block, the reinforcing connecting piece 5 is a titanium metal welding wire, and the support 6 is provided.

[0101] To manufacture a large area titanium-stainless steel composite plate, the material combination is TA1G+S30403, the base S30403 size is 62×1650×1870mm, and the composite TA1G size is 10×1750×1970mm. Figure 1, place the flat stainless steel substrate 1 with the upper surface polished and rust-free on the sandy foundation 7 with a thickness of 150mm, then place the flat titanium composite plate 2 with the lower surface polished and rust-free on the substrate 1, and ensure that the two are closely fitted, then the titanium end faces of the four fixed blocks 4 with a size of 10×70×150mm and one end welded with titanium steel composite blocks are vertically welded to 1 / 3 of the two long sides of the composite plate 2, and then weld two rigid structures 3 made of Q235B, with a cross-sectional thickness of 10mm, a cross-sectional width of 50mm, a height of 70mm, and a length of 1850mm to the upper end of the fixed block 4. One end of the six Φ2.0mm reinforcing connectors 5 with a length of 500mm are respectively welded to 1 / 4, 1 / 2, and 3 / 4 of the width direction of the composite plate surface directly below the rigid structure 3, and the titanium welding wire is tightened and the other end is vertically tied to the rigid structure 3 while ensuring that the base and composite plate surfaces are in close contact. Then, the titanium composite plate 2 is lifted and a circular support 6 made of copper sheet with a height of 12 mm, a diameter of Φ5 mm, and a thickness of 0.3 mm is placed around the substrate 1. The spacing between adjacent supports is 150 mm on the short side and 120 mm on the long side, and supports 6 are placed at all four corners. Then, the composite plate 2 is stably placed on the support 6. A wooden frame 8 with a height of 55 mm and a thickness of 2 mm is pasted around the composite plate 2. Explosives 9 are placed on the composite plate 2 and spread evenly according to the specified thickness requirements. Detonators 10 are placed vertically at the midpoint of the long side. After detonating the detonators 10, titanium-stainless steel composite slabs are obtained. The slabs are heat treated according to the specified heat treatment process and leveled. After flaw detection, the bonding rate is 100%. The 50 mm boundary effect area around the periphery is cut off. The periphery is subjected to penetration testing. No red spot defects are found. The performance test meets the design requirements. Finally, a titanium-stainless steel composite plate with bonding rate, performance and size that meet the design requirements is obtained.

[0102] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A metal composite plate explosion welding device for reducing interface defects, used for maintaining a uniform distance between a base plate (1) and a composite plate (2), characterized in that: It comprises a rigid structure (3), a fixing block (4), a reinforcing connecting piece (5) and a support (6); The doubler plate (2) and the rigid structure (3) form an integrated structure through the fixing block (4) and the reinforcing connector (5), which is used to fix the doubler plate (2) and maintain the doubler plate (2) in a horizontal plane; The support (6) is arranged around the substrate (1), and one end of the support (6) away from the substrate (1) is connected to the doubler plate (2) for supporting the doubler plate (2) and limiting the distance between the substrate (1) and the doubler plate (2).

2. The metal composite plate explosion welding device for reducing interface defects according to claim 1 is characterized in that: The rigid structure (3) is one of a T-beam, a rectangular frame, a truss structure, an I-beam or a multi-point support platform.

3. The metal composite plate explosion welding device for reducing interface defects according to claim 1 is characterized in that: A plurality of the fixing blocks (4) are arranged on the edge of the doubler plate (2), one end of the fixing block (4) is connected to the doubler plate (2), and one end of the fixing block (4) away from the doubler plate (2) is connected to the rigid structure (3).

4. The metal composite plate explosion welding device for reducing interface defects according to claim 3 is characterized in that: The fixing block (4) and the composite plate (2), and the fixing block (4) and the rigid structure (3) are connected by welding.

5. The metal composite plate explosion welding device for reducing interface defects according to claim 1 is characterized in that: The fixing block (4) is a rod-shaped or block-shaped structure, and the cross-sectional area of ​​the fixing block (4) ranges from 50 to 1000 mm².

6. The metal composite plate explosion welding device for reducing interface defects according to claim 1 is characterized in that: The two ends of the reinforcing connector (5) are respectively connected to the composite plate (2) and the rigid structure (3), and a plurality of the reinforcing connectors (5) are evenly distributed in the middle of the composite plate (2).

7. The metal composite plate explosion welding device for reducing interface defects according to claim 6 is characterized in that: Six reinforcing connectors (5) are provided, and the six reinforcing connectors (5) are arranged in two rows. The reinforcing connectors (5) are arranged at 1 / 4, 1 / 2, and 3 / 4 along the width direction of the complex plate (2).

8. The metal composite plate explosion welding device for reducing interface defects according to claim 1 is characterized in that: One end of the reinforcing connector (5) is fixedly connected to the doubler plate (2), and one end of the reinforcing connector (5) away from the doubler plate (2) is adjustably connected to the rigid structure (3) to adjust the distance between the middle of the doubler plate (2) and the rigid structure (3) and ensure the horizontality of the doubler plate (2).

9. The metal composite plate explosion welding device for reducing interface defects according to claim 1, characterized in that: The reinforcing connecting piece (5) is a metal wire, and the diameter of the reinforcing connecting piece (5) ranges from 1 to 5 mm.

10. A method for explosive welding of metal composite plates to reduce interface defects, characterized in that: The explosive welding device for metal composite plates with reduced interface defects as claimed in any one of claims 1 to 9 comprises the following specific steps: S1: placing the surface-treated composite plate (2) on the surface-treated substrate (1) and making the two closely contact each other; S2: welding the fixing block (4) to the edge of the doubler plate (2), and welding the rigid structure (3) to an end of the fixing block (4) away from the doubler plate (2); S3: vertically spot-welding one end of the reinforcing connector (5) to the surface of the doubler plate (2), and while ensuring that the doubler plate 3 and the base plate 2 are in close contact, tightening and vertically tying the end of the reinforcing connector (5) away from the doubler plate (2) to the rigid structure (3); S4: lift the composite plate (2), place the support (6) around the base plate (1), and then place the composite plate (2) steadily on the support (6); S5: After placing a surrounding frame (8) around the double plate (2), spreading explosives (9) on the double plate (2), and placing a detonator (10) on one side of the double plate (2) intersecting with the perpendicular bisector of the rigid structure (3); S6: detonating the detonator (10) to obtain an explosive composite slab; S7: After heat treatment, leveling and ultrasonic testing of the explosive composite slab, the peripheral boundary effect area is cut off, and finally a large-area explosive metal composite plate with a middle unsupported influence area is obtained.

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