Efficient metal explosive welding device and composite plate thereof

Abstract

The utility model provides an efficient metal explosive welding device and a composite board thereof, and solves the technical problems that in the explosion process of an existing device, sand and dust are formed by flying over the sky and easily enter the space between a base layer board and a composite layer board, particularly the composite board with the large explosive board width is produced, and the bonding rate of the composite board is reduced. A base layer plate is horizontally placed on an explosion foundation, a plurality of columnar supporting bodies with the same height are evenly distributed on the top of the base layer plate, the tops of the columnar supporting bodies are connected with the bottom of a composite layer plate, and the base layer plate perpendicularly corresponds to the composite layer plate; the periphery of the top of the composite layer plate is bonded to form an explosive box, powdery explosives are evenly distributed in the explosive box, and the surface of the powdery explosives is horizontally arranged. The detonator is vertically inserted into the powdery explosive; the hexogen explosive is arranged on the surface of the powdery explosive, and the surface of the hexogen explosive is horizontally arranged; a detonator is arranged in the middle of the explosive box, vertically and downwards penetrates through the hexogen explosive and then is inserted into the powdery explosive; the method can be widely applied to the technical field of explosive welding.

Description

Technical Field

[0001] The present application relates to the technical field of explosion welding, and in particular to a high-efficiency metal explosion welding device and a composite plate thereof. Background Art

[0002] Explosive welding utilizes the energy generated by explosive detonation to force the clad plate to collide with the base plate at high speed, generating a jet at the interface and ultimately forming a metallurgical bond between the two metals. Explosive welding offers significant advantages, including high weld strength and a minimal heat-affected zone. Theoretically, it can be used to weld a variety of dissimilar metals. Due to its core technological advantages, explosive welding has become an essential production process in the petroleum, chemical, aerospace, and military sectors.

[0003] The utility model, with publication number CN114871562A, discloses an energy-saving method for producing explosively welded composite panels. First, the surfaces to be joined of the base plate and the composite plate are treated to remove the oxide layer. Second, the base plate is placed horizontally on a foundation, and a columnar support of uniform height is evenly placed on top of the base plate, along the surface to be joined. The composite plate is then placed face-down on top of the columnar support. Next, wooden boards or fiberboards are bonded around the top of the composite plate, forming an explosive box. Powdered emulsion explosives are evenly distributed within the explosive box. Next, an isolation plate is placed on top of the powdered emulsion explosive to completely cover it. A layer of yellow sand is then evenly placed on top of the isolation plate. A detonator is placed against the middle of the short side of the explosive box, passing through the yellow sand layer and isolation plate, and then vertically inserted into the powdered emulsion explosive. Finally, the detonator is detonated, completing the explosive welding process and producing a metal composite panel. This utility model improves explosive energy utilization and achieves energy conservation and consumption reduction.

[0004] However, the explosive welding device produced by the above method has a technical drawback: during the explosion, yellow sand is thrown into the air, forming dust. The airflow generated by the explosion easily carries this dust and sand into the gap between the base plate and the cladding plate. This reduces the bonding efficiency of the cladding plate, especially when producing cladding plates with large explosion widths. This technical problem needs to be urgently addressed. Summary of the Invention

[0005] The purpose of the utility model is to solve the deficiencies of the above-mentioned technology and provide a high-efficiency metal explosion welding device and a composite plate thereof, which is suitable for manufacturing composite plates with larger explosion plate widths and improving the bonding rate of the composite plates.

[0006] To this end, the utility model provides a high-efficiency metal explosion welding device, which is provided with an explosion foundation, on which a base plate is horizontally placed, a top surface to be joined of the base plate is evenly connected to a plurality of columnar support bodies with the same height, the tops of the plurality of columnar support bodies are connected to the bottom surface to be joined of the composite plate, and the positions of the base plate and the composite plate correspond vertically; the top of the composite plate is bonded around to form an explosive box, powdered explosive is evenly placed in the explosive box, and the surface of the powdered explosive is arranged horizontally; a detonator is vertically inserted into the powdered explosive; RDX explosive is placed on the surface of the powdered explosive, and the surface of the RDX explosive is arranged horizontally; a detonator is arranged in the middle of the explosive box, and the detonator passes vertically downward through the RDX explosive and is then inserted into the powdered explosive.

[0007] Preferably, the detonator passes through the RDX explosive and the powdered explosive vertically downward in sequence and is connected to the top of the composite plate.

[0008] Preferably, a layer of RDX explosive is placed on the surface of the powdered explosive in the middle of the width of the explosive box and along the length direction of the explosive box.

[0009] Preferably, the powdered explosive is a powdered expanded explosive.

[0010] Preferably, the unevenness of the composite board is less than 5 mm per meter, and the unevenness of the entire board is less than 20 mm; the surface roughness of the bottom surface to be bonded of the composite board is not greater than 1.6 μm; and the edges of the composite board extend at least 25 mm beyond the edges of the base board.

[0011] Preferably, the support columns are evenly arranged in a square array and welded on the base plate, and the length and width of the square array are parallel to the length and width of the base plate respectively, the spacing between adjacent support columns is at least 200 mm, and the distance between the outermost support column and the edge of the base plate is 10 mm; the diameter of the support column is not greater than 1.5 mm, and the height of the support column is 8-12 mm.

[0012] Preferably, the explosive box is made of a high-viscosity tape with a width of 50 mm, bonded with a cardboard with a thickness of 2-3 mm and a height of 100 mm.

[0013] Preferably, the thickness of the powdered explosive is 28-35 mm; the width of the RDX explosive is 10 mm and the thickness is 3-5 mm.

[0014] Preferably, the base plate has a thickness of 12-30 mm, a width of 950-1950 mm, and a length of 5900-11200 mm; the cladding plate has a thickness of 3-4 mm, a width of 1000-2000 mm, and a length of 6000-12000 mm.

[0015] A composite plate is produced by explosion welding using the high-efficiency metal explosion welding device described in any one of the above items; the composite plate is a nickel plate, and the base plate is a low-alloy steel plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects: It provides a highly efficient metal explosive welding device and its composite plate. RDX is placed on the surface of the powdered explosive, with the surface of the RDX being arranged horizontally. A detonator is positioned in the middle of the explosive box, passing vertically downward through the RDX and then inserted into the powdered explosive. During use, the detonator simultaneously detonates the powdered explosive and the RDX. The RDX drives the powdered explosive within the explosive box to rapidly detonate and propagate, significantly shortening the stable detonation propagation distance of the powdered explosive. This allows the explosive welding of large-width metal composite plates to be performed under a stable detonation state. Furthermore, the present invention avoids the use of yellow sand as in the prior art, thereby fundamentally avoiding the technical problem of sand and dust entering between the base plate and the cladding plate during explosive welding, resulting in a low bonding rate of the composite plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 It is a structural diagram of the utility model;

[0019] Figure 2 for Figure 1 A schematic structural diagram of a top view of the view shown;

[0020] Figure 3 for Figure 2 Schematic diagram of the local structure of the AA section view.

[0021] Labels in the figure: 1. Explosion foundation, 2. Base plate, 3. Support column, 4. Composite plate, 5. RDX explosive, 6. Explosive box, 7. Powdered explosive, 8. Detonator. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining this application and are not intended to limit this application. The methods used in this utility model are conventional methods unless otherwise specified; the raw materials and devices used are conventional commercially available products unless otherwise specified.

[0023] Depend on Figure 1-3 As shown, the utility model provides a high-efficiency metal explosion welding device, which is provided with an explosion foundation 1, a base plate 2 is placed horizontally on the explosion foundation 1, the top surface to be joined of the base plate 2 is evenly connected to a plurality of columnar support bodies with the same height, the tops of the plurality of columnar support bodies are connected to the bottom surface to be joined of the composite plate 4, and the positions of the base plate 2 and the composite plate 4 correspond vertically; the top of the composite plate 4 is bonded around to form an explosive box 6, powdered explosive 7 is evenly distributed in the explosive box 6, and the surface of the powdered explosive 7 is arranged horizontally; a detonator 8 is vertically inserted into the powdered explosive 7; RDX explosive 5 is distributed on the surface of the powdered explosive 7, and the surface of the RDX explosive 5 is arranged horizontally; a detonator 8 is arranged in the middle of the explosive box 6, and the detonator 8 passes vertically downward through the RDX explosive 5 and is inserted into the powdered explosive 7.

[0024] During use, the detonator 8 simultaneously detonates the powdered explosive 7 and the RDX explosive 5. The RDX explosive 5 causes the powdered explosive 7 in the explosive box 6 to rapidly detonate and propagate. This significantly shortens the stable detonation propagation distance of the powdered explosive 7, allowing the explosive welding process of large-width metal composite panels to be carried out under a stable detonation state. Furthermore, the present invention does not use yellow sand as in the prior art, thereby fundamentally avoiding the technical problem of sand and dust entering between the base plate 2 and the cladding plate 4 during explosive welding, resulting in a low composite plate bonding rate.

[0025] Preferably, the detonator 8 passes through the RDX explosive 5 and the powdered explosive 7 vertically downward in sequence and is connected to the top of the composite plate 4, so that the detonation of the powdered explosive 7 is faster and more orderly, and the stable detonation propagation distance of the powdered explosive 7 is further shortened.

[0026] Preferably, a layer of RDX explosive 5 is placed on the surface of the powdered explosive 7 in the middle of the width of the explosive box 6 along the length direction of the explosive box. When in use, the detonator 8 simultaneously detonates the powdered explosive 7 and the RDX explosive 5. The RDX explosive 5 will drive the powdered explosive 7 in the explosive box 6 in the length direction to quickly detonate and spread along the powdered explosive 7 in the width direction, further shortening the stable detonation propagation distance of the powdered explosive 7, so that the explosive welding process of the large-width nickel-steel composite plate can be carried out under a stable detonation state.

[0027] The powdered explosive 7 is preferably powdered expanded explosive to enhance the explosive performance and power.

[0028] Preferably, the unevenness of the composite board 4 is less than 5 mm per meter, and the unevenness of the entire board is less than 20 mm; the surface roughness of the bottom surface to be bonded of the composite board 4 is not greater than 1.6 μm; the four edges of the composite board 4 extend at least 25 mm beyond the four edges of the base board 2.

[0029] The support columns 3 are preferably evenly arranged and welded on the base plate 2 in a square array, and the length and width of the square array are parallel to the length and width of the base plate 2, respectively. The spacing between adjacent support columns 3 is at least 200 mm, and the distance between the outermost support column 3 and the edge of the base plate 2 is 10 mm; the diameter of the support column 3 is not greater than 1.5 mm, and the height of the support column 3 is 8-12 mm.

[0030] The explosive box 6 is preferably made of a high-viscosity adhesive tape with a width of 50 mm, bonded with a cardboard with a thickness of 2-3 mm and a height of 100 mm.

[0031] The thickness of the powdered explosive 7 is preferably 28-35 mm; the width of the RDX explosive 5 is preferably 10 mm, and the thickness is preferably 3-5 mm.

[0032] The thickness of the base plate 2 is preferably 12-30 mm, the width is preferably 950-1950 mm, and the length is preferably 5900-11200 mm; the thickness of the composite plate 4 is preferably 3-4 mm, the width is preferably 1000-2000 mm, and the length is preferably 6000-12000 mm.

[0033] A composite plate is produced by explosion welding using a high-efficiency metal explosion welding device as described in any of the above items; the composite plate 4 is a nickel plate, such as nickel plate N6, nickel plate N5, nickel plate N7, etc.; the base plate 2 is a low-alloy steel plate, such as low-alloy steel Q245R, Q345R, etc.

[0034] Example 1

[0035] Plate selection:

[0036] The base plate 2 is made of Q345R low alloy plate with the specifications of 12mm thickness, 950mm width and 6000mm length; the composite plate 4 is made of nickel N6 plate with the specifications of 3mm thickness, 1000mm width and 6050mm length; the support column 3 has a diameter of 1.2mm and a height of 8mm.

[0037] Production method:

[0038] 1) The nickel clad layer is leveled, and the surfaces to be bonded between the clad plate 4 and the base plate 2 are polished using a grinding machine equipped with an 80# grinding wheel to remove surface oxides and oil stains, and to ensure that there are no pits or scars on the plate surface;

[0039] 2) Place the base plate 2 horizontally on the explosive foundation 1, and evenly arrange several support columns 3 with a height of 8 mm in a square structure at intervals of 200 mm on the upper surface to be bonded of the base plate 2. Then place the cladding plate 4 with the surface to be bonded facing downward on top of the support columns 3, and ensure that the base plate 2 and cladding plate 4 are positioned vertically and correspondingly, and the four sides of the cladding plate 4 are at least 25 mm larger than the four sides of the base plate 2;

[0040] 3) 2mm thick, 100mm high cardboard is placed around the top of the composite panel 4. The cardboard and composite panel 4 are bonded together using 50mm wide tape to form an explosive box 6. Powdered explosive 7 is evenly distributed within the explosive box 6 to a height of 30mm, maintaining a horizontal surface. The powdered explosive 7 is a powdered expanded explosive.

[0041] 4) Lay a layer of RDX explosive 5 on the surface of the powdered explosive 7 along the center line of the width, with a width of 10 mm and a thickness of 3 mm;

[0042] 5) Place the detonator 8 at the center of the RDX explosive 5, through the RDX explosive 5 and into the powdered emulsion explosive to a depth reaching the surface of the nickel coating;

[0043] 6) Finally, the detonator 8 is detonated to complete the explosive welding, and a nickel N6+Q345R metal composite plate with a size of (3+12)×950×6000 mm is obtained. This composite plate has been used in large quantities to manufacture pressure vessel equipment.

[0044] Example 2

[0045] Plate selection:

[0046] The base plate 2 is made of Q345R low alloy plate with the following dimensions: thickness 28mm, width 1800mm, and length 8500mm; the cladding plate 4 is made of nickel N6 plate with the following dimensions: thickness 3mm, width 1850mm, and length 8560mm; the support column 3 has a diameter of 1.2mm and a height of 8mm;

[0047] Production method:

[0048] 1) The nickel clad layer is leveled, and the surfaces to be bonded between the clad plate 4 and the base plate 2 are polished using a grinding machine equipped with an 80# grinding wheel to remove surface oxides and oil stains, and to ensure that there are no pits or scars on the plate surface;

[0049] 2) Place the base plate 2 horizontally on the explosive foundation 1, and evenly arrange several support columns 3 with a height of 8 mm in a square structure at intervals of 200 mm on the upper surface to be bonded of the base plate 2. Then place the cladding plate 4 with the surface to be bonded facing downward on top of the support columns 3, and ensure that the base plate 2 and cladding plate 4 are positioned vertically and correspondingly, and the four sides of the cladding plate 4 are at least 25 mm larger than the four sides of the base plate 2;

[0050] 3) 2mm thick, 100mm high cardboard is placed around the top of the composite panel 4. The cardboard and composite panel 4 are bonded together using 50mm wide tape to form an explosive box 6. Powdered explosive 7 is evenly distributed within the explosive box 6 to a height of 30mm, maintaining a horizontal surface. The powdered explosive 7 is a powdered expanded explosive.

[0051] 4) Lay a layer of RDX explosive 5 on the surface of the powdered explosive 7 along the center line of the width, with a width of 10 mm and a thickness of 3 mm;

[0052] 5) Place the detonator 8 at the center of the RDX explosive 5, through the RDX explosive 5 and into the powdered emulsion explosive to a depth reaching the surface of the nickel coating;

[0053] 6) Finally, the detonator 8 is detonated to complete the explosive welding, and a nickel N6+Q345R metal composite plate with a size of (3+28)×1800×8500 mm is obtained. This composite plate has been used in large quantities to manufacture pressure vessel equipment.

[0054] Example 3

[0055] Plate selection:

[0056] The base plate 2 is made of Q345R low alloy plate with the following specifications: thickness 30mm, width 1950mm, and length 11200mm; the cladding plate 4 is made of nickel N6 plate with the following specifications: thickness 4mm, width 2000mm, and length 11260mm; the support column 3 has a diameter of 1.5mm and a height of 12mm;

[0057] Production method:

[0058] 1) The nickel clad layer is leveled, and the surfaces to be bonded between the clad plate 4 and the base plate 2 are polished using a grinding machine equipped with an 80# grinding wheel to remove surface oxides and oil stains, and to ensure that there are no pits or scars on the plate surface;

[0059] 2) Place the base plate 2 horizontally on the explosive foundation 1, and evenly arrange several support columns 3 with a height of 8 mm in a square structure at intervals of 200 mm on the upper surface to be bonded of the base plate 2. Then place the cladding plate 4 with the surface to be bonded facing downward on top of the support columns 3, and ensure that the base plate 2 and cladding plate 4 are positioned vertically and correspondingly, and the four sides of the cladding plate 4 are at least 25 mm larger than the four sides of the base plate 2;

[0060] 3) 2mm thick, 100mm high cardboard is placed around the top of the composite panel 4. The cardboard and composite panel 4 are bonded together using 50mm wide tape to form an explosive box 6. Powdered explosive 7 is evenly distributed within the explosive box 6 to a height of 35mm, maintaining a horizontal surface. The powdered explosive 7 is a powdered expanded explosive.

[0061] 4) Lay a layer of RDX explosive 5 on the surface of the powdered explosive 7 along the center line of the width, with a width of 15 mm and a thickness of 5 mm;

[0062] 5) Place the detonator 8 at the center of the RDX explosive 5, through the RDX explosive 5 and into the powdered emulsion explosive to a depth reaching the surface of the nickel coating;

[0063] 6) Finally, the detonator 8 is detonated to complete the explosive welding, and a nickel N6+Q345R metal composite plate with a size of (4+30)×1950×11200 mm is obtained. This composite plate has been used in large quantities to manufacture pressure vessel equipment.

[0064] The nickel N6 metal composite plates obtained in Examples 1-3 above were subjected to shear strength tests according to the method in the GB / T6396-2008 standard. Example 1, Example 2, and Example 3 reached 420 MPa, 360 MPa, and 310 MPa, respectively (far higher than the required value of 210 MPa in the standard), with a bonding rate of 100%. All mechanical properties were within the technical requirements of the national standard GB / T 8165-2008 and the industry standard NB / T47002.2-2019. At the same time, while achieving the same indicators mentioned above, the construction efficiency was increased by 1-2 times, and the explosion plate area was more than doubled compared with the traditional process.

[0065] Example 4

[0066] This embodiment is basically the same as the embodiment 1, except that the composite plate 4 is made of nickel plate N5, producing a nickel N5 metal composite plate with a bonding rate of 100% and a shear strength of 385 MPa.

[0067] Example 5

[0068] This embodiment is basically the same as embodiment 2, except that the composite plate 4 is made of nickel plate N7, producing a nickel N7 metal composite plate with a bonding rate of 100% and a shear strength of 382 MPa.

[0069] It can be seen that the nickel-steel metal composite plates prepared in the above embodiments 1-5 have the following technical effects:

[0070] (1) The nickel-steel metal composite plate produced by the present invention has been shown by non-destructive testing and mechanical tests to have indicators such as bonding strength, unbonding rate, mechanical properties, and bending properties that meet or exceed the technical requirements of the national standard GB / T 8165-2008 and the industry standard NB / T 47002.2-2019. After being widely used in the field of large-scale chemical equipment manufacturing, the technical parameters of the metal composite plate fully meet the requirements under harsh conditions such as working environment, temperature and pressure, and have achieved import substitution.

[0071] (2) In the process of producing nickel-steel metal composite plates using the present invention, since support columns 3 of uniform shape and size are used and a stud welder is used for mechanized welding operation, the support columns 3 are welded together with the base material. During the construction process, the support columns 3 will not move, tilt or bend due to environmental interference. The use of the present invention process improves the operating efficiency by 2-3 times compared with the traditional explosive welding process. At the same time, the explosion quality is also significantly improved.

[0072] (3) In the process of producing nickel-steel metal composite plates using the present invention, the powdered explosive 7 is powdered expanded explosive. After the powdered explosive 7 is laid, a layer of high-detonation-velocity RDX explosive 5 is laid along the center line of the width direction of the powdered explosive 7. The detonator 8 simultaneously detonates the powdered explosive 7 and the RDX explosive 5. The RDX explosive 5 drives the powdered explosive 7 along the entire length of the steel plate to detonate rapidly and propagate along the width direction of the steel plate, significantly shortening the stable detonation propagation distance of the powdered explosive 7. This allows the explosive welding process of large-width nickel-steel composite plates to be carried out under a stable detonation state. Using the present invention process, compared with the traditional explosive welding process, the explosive plate width of the nickel-steel composite plate is increased by more than twice the original.

[0073] In the description of the present invention, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inside", "outside", "back", "middle", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0074] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A high-efficiency metal explosion welding device, which is provided with an explosion base (1), a base plate (2) is horizontally placed on the explosion base (1), the top surface to be joined of the base plate (2) is evenly connected to a plurality of columnar supports with the same height, the tops of the plurality of columnar supports are connected to the bottom surface to be joined of the composite plate (4), and the base plate (2) and the composite plate (4) are vertically corresponding in position; the top of the composite plate (4) is bonded around to form an explosive box (6), powdered explosive (7) is evenly distributed in the explosive box (6), and the surface of the powdered explosive (7) is arranged horizontally; a detonator (8) is vertically inserted into the powdered explosive (7); it is characterized in that The surface of the powdered explosive (7) is provided with RDX explosive (5), and the surface of the RDX explosive (5) is arranged horizontally; the detonator (8) is arranged in the middle of the explosive box (6), and the detonator (8) vertically downward passes through the RDX explosive (5) and is then inserted into the powdered explosive (7).

2. The high-efficiency metal explosion welding device according to claim 1, characterized in that: The detonator (8) passes vertically downward through the RDX explosive (5) and the powdered explosive (7) in sequence, and is then connected to the top of the composite plate (4).

3. The high-efficiency metal explosion welding device according to claim 1, characterized in that: A layer of the RDX explosive (5) is placed on the surface of the powdered explosive (7) in the middle of the width of the explosive box (6) along the length direction of the explosive box.

4. The high-efficiency metal explosion welding device according to claim 1, characterized in that: The powdered explosive (7) is a powdered expanded explosive.

5. The high-efficiency metal explosion welding device according to claim 1, characterized in that: The unevenness of the composite plate (4) is less than 5 mm per meter, and the unevenness of the entire plate is less than 20 mm; the surface roughness of the bottom surface to be bonded of the composite plate (4) is not greater than 1.6 μm; and the four edges of the composite plate (4) extend beyond the four edges of the base plate (2) by at least 25 mm.

6. The high-efficiency metal explosion welding device according to claim 5, characterized in that: The support columns (3) are evenly arranged and welded on the base plate (2) in a square array, and the length and width of the square array are respectively parallel to the length and width of the base plate (2), the spacing between adjacent support columns (3) is at least 200 mm, and the distance between the outermost support column (3) and the edge of the base plate (2) is 10 mm; the diameter of the support column (3) is not greater than 1.5 mm, and the height of the support column (3) is 8-12 mm.

7. The high-efficiency metal explosion welding device according to claim 6, characterized in that: The explosive box (6) is made of a high-viscosity tape with a width of 50 mm, bonded with a cardboard with a thickness of 2-3 mm and a height of 100 mm.

8. The high-efficiency metal explosion welding device according to claim 6, characterized in that: The thickness of the powdered explosive (7) is 28-35 mm; the width of the RDX explosive (5) is 10 mm and the thickness is 3-5 mm.

9. The high-efficiency metal explosion welding device according to claim 6, characterized in that: The base plate (2) has a thickness of 12-30 mm, a width of 950-1950 mm, and a length of 5900-11200 mm; the composite plate (4) has a thickness of 3-4 mm, a width of 1000-2000 mm, and a length of 6000-12000 mm.

10. A composite board, characterized in that: It is manufactured by explosion welding using the high-efficiency metal explosion welding device as described in any one of claims 1 to 9; the composite plate (4) is a nickel plate, and the base plate (2) is a low-alloy steel plate.

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