Manufacturing method and welding device for super-thick large-diameter explosive welding composite ring

Abstract

The invention discloses a manufacturing method and a welding device of a super-thick large-diameter explosive welding composite ring, and belongs to the technical field of metal explosive machining. In order to solve the problems of high cost, low efficiency, potential quality hazards and the like caused by disposable cement filling in the prior art, the invention provides the following technical scheme: the method comprises the following steps of: pre-processing a dovetail groove in a base layer ring; a set of reusable modular framework with matched dovetail convex eaves is provided; the framework and the base layer ring are mechanically meshed in a welding-free manner through a dovetail tenon-and-mortise structure so as to provide rigid support; after explosive cladding, the framework can be recycled only by cutting the roots of the dovetail grooves in a small range. The reusable modular framework and the innovative dovetail mortise and tenon positioning structure are used for replacing a traditional one-time filling and welding process, the manufacturing cost is remarkably reduced, the production efficiency and the product quality are greatly improved, and the method is more environmentally friendly.

Description

Technical Field

[0001] This invention belongs to the field of explosive processing technology for layered metal composite materials, specifically relating to an explosive welding method for manufacturing ultra-thick, large-diameter composite rings, and a dedicated explosive welding device used in this method. Background Technology

[0002] Metallic layered composite materials, due to their ability to combine the superior properties of different metals, play an indispensable role in key fields such as petrochemicals, nuclear power, aerospace, and pressure vessel manufacturing. Explosive welding, as a cutting-edge technology for achieving large-area solid-state bonding of dissimilar metals, is particularly suitable for preparing material combinations that are difficult to join using traditional fusion welding methods, such as titanium / steel, nickel / steel, and copper / steel. Among numerous composite material products, ultra-thick (typically > 100 mm) and large-diameter (typically > 2.5 m) ring-shaped composite components are a typical product with high demand and extremely high manufacturing difficulty, such as the safety ends of nozzles on nuclear power pressure vessels and tower flanges of large chemical reactors. These components must withstand the harsh tests of high temperature, high pressure, and highly corrosive media during service, therefore, their manufacturing quality, especially interfacial bonding strength and dimensional accuracy, has almost stringent requirements.

[0003] However, applying explosive welding technology directly to the manufacture of such ultra-thick, large-diameter composite rings faces a core and challenging technical bottleneck: how to effectively suppress significant radial shrinkage deformation of the thick base ring under the intense impact load of tens of gigapascals generated during the explosion. If the dimensions of the base ring become unstable, not only will the final product fail to meet precision tolerance requirements, but it will also severely affect the bonding quality and uniformity of the composite interface, and may even lead to fatal defects such as weak bonding or cracking.

[0004] To address this challenge, existing technologies commonly employ an "internal rigid support" approach. For example, a method disclosed in Chinese patent application CN119703644A typically reflects the current mainstream practice in the industry. The core of this method lies in: first, welding two circular thin steel plate end caps to seal the openings at both ends of the base ring to be laminated, thus constructing a closed cylindrical container inside the ring. Then, pre-mixed cement mortar, concrete, or aggregate is poured into the inner cavity of this container. After a long period of static curing, once the filling material has completely solidified and hardened, a solid, one-time rigid support core is formed inside the ring. During the subsequent explosive lamination process, this support core can withstand the enormous explosive pressure, thereby suppressing radial deformation of the base ring to a certain extent.

[0005] Although the aforementioned technical solutions, represented by CN119703644A, have been applied to some extent in practice, their inherent defects are also very prominent, and have become a key bottleneck restricting the production cost, efficiency and quality of such products.

[0006] First, the process is extremely complicated and has a long production cycle. It includes a series of steps such as welding the end cap, preparing and injecting slurry, letting it stand for a long time to solidify, breaking the end cap by hot processing methods such as air gouging or cutting after the explosion, and then using heavy crushing tools to painstakingly remove and clean the solidified hard blocks inside. This results in extremely low production efficiency.

[0007] Secondly, the manufacturing cost is high. Each production requires a large amount of steel plate end caps and fillers such as cement and sand. These materials are for single use only and become industrial waste after an explosion. Not only are the material costs high, but the subsequent waste disposal also brings additional economic burdens and environmental pressures.

[0008] More importantly, this method has significant quality risks. Welding and air gouging of the end caps at the edge of the expensive base ring inevitably introduces a heat-affected zone and uncontrollable residual stress, which may lead to deformation of the ring edge or the formation of microcracks. Furthermore, when using force to break the internal hard blocks later, it is also very easy to cause impact damage to the inner wall of the base ring.

[0009] In summary, existing technologies for manufacturing ultra-thick, large-diameter composite rings, whether employing the internal filling method disclosed in CN119703644A or the plate cutting method, have consistently failed to escape the predicament of high cost, low efficiency, complex processes, and quality risks. Therefore, there is an urgent need in this field for a more economical, reliable, and sustainable innovative technological solution. Summary of the Invention

[0010] I. Technical Issues

[0011] The purpose of this invention is to overcome a series of problems existing in the prior art, such as high material cost, complicated process, low efficiency, non-reusability, and easy introduction of quality defects in welding positioning, and to provide a novel manufacturing method for ultra-thick large-diameter explosively welded composite rings and the explosive welding device used therein.

[0012] II. Technical Solution

[0013] To achieve the above objectives, the present invention provides a method for manufacturing an ultra-thick, large-diameter explosively welded composite ring, comprising the following steps:

[0014] S1. Pre-treat a base ring by machining a ring-shaped dovetail groove on the surface of the base ring to be laminated;

[0015] S2. A reusable frame is provided, wherein the frame is provided with a dovetail eave that matches the dovetail groove;

[0016] S3. The skeleton is assembled into the inner cavity of the base ring, so that the dovetail protrusion and the dovetail groove are mechanically engaged;

[0017] S4. Place the composite plate on the surface to be composited of the base layer ring and arrange explosives;

[0018] S5. Perform explosive welding to form a composite ring.

[0019] Preferably, between step S3 and step S4, step S31 is further included: filling the internal cavity of the skeleton with loose granular filler.

[0020] Preferably, after step S5, step S6 is further included: recycling the skeleton.

[0021] Preferably, step S6 includes:

[0022] S61. Cut along the root of the dovetail groove;

[0023] S62. Lift the entire skeleton out.

[0024] The present invention also provides an explosive welding apparatus for the method described in the first aspect, comprising:

[0025] A base ring, the inner cavity of which has a continuous dovetail groove on the surface to be laminated; and

[0026] A reusable skeleton is disposed in the inner cavity of the base ring, and a continuous ring-shaped dovetail protrusion is provided on the outer peripheral surface of the skeleton, the dovetail protrusion precisely engaging with the dovetail groove.

[0027] Preferably, the skeleton comprises:

[0028] One central support plate;

[0029] Multiple radially reinforcing beams, the bottom ends of which are connected to the central support plate; and

[0030] An outer ring beam is connected to one end of the plurality of radially reinforcing beams, and the dovetail eaves are provided on the outer ring beam.

[0031] Preferably, the central support plate, multiple radial reinforcing beams, and the outer ring beam together form an internal cavity.

[0032] Preferably, it also includes a loose granular filler that fills the internal cavity.

[0033] Preferably, it also includes a composite board placed on the surface to be laminated of the base layer ring.

[0034] Preferably, it further includes an explosive layer disposed above the cladding plate.

[0035] III. Beneficial Effects

[0036] Compared with existing technologies, this invention replaces the completely disposable welded end caps and cement mortar fillers in traditional processes with a robust, durable, and reusable steel frame. This not only directly saves a significant amount of material procurement and waste disposal costs, but more importantly, it fundamentally shortens the manufacturing process. By eliminating a series of tedious and time-consuming processes such as welding, waiting for solidification, air gouging, and violent crushing, and instead adopting a simple and quick purely mechanical operation of "lifting and engaging" and "small-scale cutting and separation," the production cycle is significantly shortened.

[0037] While significantly improving efficiency, ensuring product quality is equally crucial. By completely eliminating any welding work on the base ring body, potential quality hazards such as heat-affected zones and residual stress introduced by welding are eradicated. Furthermore, the unique dovetail tenon-and-mortise mechanical interlocking structure provides stronger, more active, and more uniform radial constraint forces compared to the passive support of traditional fillers. This more effectively suppresses the shrinkage and deformation of the base ring during the explosion process, providing a solid guarantee for obtaining a high-quality, highly uniform composite interface.

[0038] At the same time, this technological innovation has made the entire operation process simpler and safer, replacing high-risk, high-intensity thermal and crushing operations with conventional hoisting and cutting operations.

[0039] Ultimately, the recycling of the skeleton and the effective filling of industrial waste together embody the concepts of green manufacturing and circular economy, making this invention not only possess significant technical and economic advantages, but also excellent environmental and sustainability value. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall structure of the pre-explosive recombination device in an embodiment of the present invention.

[0041] Figure 2 This is an exploded perspective view of the skeleton in an embodiment of the present invention.

[0042] Figure 3 This is an enlarged view of a portion of the dovetail groove on the upper surface of the base ring in an embodiment of the present invention.

[0043] The diagram shows: 1. Base ring; 21. Dovetail groove; 22. Dovetail eaves; 3. Frame; 31. Central support plate; 32. Radial reinforcing beam; 33. Outer ring beam. Detailed implementation method.

[0044] To make the objectives, technical solutions, and beneficial effects of this invention clearer and more explicit, the specific embodiments of this invention will be described in detail below with reference to the accompanying drawings. It should be understood that the embodiments described herein are only a part of the many embodiments of this invention, intended to help understand the core ideas of this invention, and are not intended to constitute any form of limitation on this invention. Any equivalent substitutions, modifications, or improvements made to the technical solutions of this invention based on the technical ideas of this invention should fall within the protection scope of this invention.

[0045] Example 1

[0046] This embodiment details a method for manufacturing an ultra-thick, large-diameter explosively welded composite ring, which is implemented using a reusable internal support and positioning system. Please refer to... Figure 1 , Figure 2 and Figure 3 The specific execution steps of this method are as follows.

[0047] The initial step S1 of this method is to pre-treat a base ring 1. In this embodiment, the base ring 1 is the basic load-bearing structure of the composite ring, and the selection of its material and size is related to the performance of the final product. Optionally, a high-strength low-alloy steel is selected as the material of the base ring 1.

[0048] To illustrate the application of this method, a specific manufacturing task is used as an example. The base ring 1 is a high-strength alloy steel ring with an outer diameter of Φ3600mm, an inner diameter of Φ3000mm, and a thickness (axial height) of 220mm. The core pretreatment process involves using a CNC vertical lathe to machine the upper surface of the base ring 1, which is the surface to be laminated with the cladding plate.

[0049] Specifically, a continuous dovetail groove 21 with an inverted trapezoidal cross-section is machined in an annular region approximately 120mm from the inner edge. To ensure subsequent meshing accuracy and strength, the dimensions of this dovetail groove 21 are controlled. For example, the top surface width at its opening can be designed to be 30mm, the bottom surface width to be 20mm, the groove depth to be 10mm, and the inclination angle of the groove wall to be controlled at 60°. The machining accuracy of this dovetail groove 21 affects the reliability of subsequent positioning and the support effect.

[0050] After the dovetail groove 21 is processed, the entire surface of the base ring 1 to be composite is also ground and polished to remove oxide scale and impurities, so that its surface meets the roughness standard required by the explosive welding process, thus creating conditions for forming a good metallurgical bond.

[0051] Next, step S2 is performed, which involves providing a reusable frame 3 that matches the aforementioned base ring 1. This frame 3 is a key component used in the method of this invention, employing a robust, reusable modular design. In the specific manufacturing of this embodiment, the frame 3 is made of Q345B steel plate. For example... Figure 2 As shown, the structure of the skeleton 3 is composed of multiple core components connected together, and the dimensions of each component are designed to match the base ring 1.

[0052] Specifically, it includes a circular central support plate 31 serving as the central foundation, with a diameter of Φ2975mm and a thickness of 30mm. Next are twelve radially evenly distributed radially reinforcing beams 32 fixedly connected to the central support plate 31, each beam having a height of 120mm and a width of 20mm. Finally, there is an annular peripheral ring beam 33 connecting the outer ends of all the radial reinforcing beams 32, forming the overall outer contour of the skeleton 3. This ring beam has a square cross-section of 100mm × 20mm and an overall outer diameter of Φ2995mm.

[0053] Importantly, a continuous ring-shaped dovetail protrusion 22 is machined or welded to the lower part of the outer peripheral surface of the outer ring beam 33. The cross-sectional shape and size of the dovetail protrusion 22 are compatible with the dovetail groove 21 pre-machined on the base ring 1.

[0054] Subsequently, step S3 is performed to assemble the skeleton 3 into the inner cavity of the base ring 1.

[0055] First, the various modular components of the frame 3, namely the central support plate 31, multiple radial reinforcing beams 32 and the outer ring beams 33, need to be pre-assembled on the ground into a complete, highly rigid overall structure through welding and other methods.

[0056] In an optional sub-step, to facilitate the recycling of the skeleton 3 after the explosive welding is completed, a layer of high-temperature resistant grease can be evenly applied to the surface of its dovetail protrusion 22 or to the inner wall of the dovetail groove 21 of the base ring 1, for example, applying high-temperature grease to the groove surface.

[0057] After completing the preparations, the assembled frame 3 is smoothly and coaxially lifted into the inner cavity of the base ring 1 using cranes or other lifting equipment. During the lifting process, guidance and fine-tuning are used to ensure that the dovetail protrusions 22 on the frame 3 can be embedded into the dovetail grooves 21 of the base ring 1, and the assembly gaps around the frame are checked to ensure their uniformity. Once the two are engaged, a mechanical interlocking structure is formed. This mechanical engagement method achieves coaxial positioning between the frame 3 and the base ring 1 and provides a rigid connection, without requiring welding operations throughout the process.

[0058] After the skeleton 3 and the base ring 1 have engaged, and before placing the cladding plate in step S4, step S31 can be optionally performed, which involves filling the internal cavity of the skeleton 3 with loose granular filler. As mentioned earlier, the modular design of the skeleton 3 creates an internal cavity with multiple fan-shaped regions, enclosed by a central support plate 31, radial reinforcing beams 32, and outer ring beams 33. The purpose of filling this cavity with material is to enhance the stability of the entire support system.

[0059] The filler can be made of low-cost materials; for example, in this embodiment, a mixture of sand, gravel, iron filings, and perlite particles is used. These fillers increase the overall inertial mass of the internal support system, while also providing auxiliary support and vibration absorption. During filling, simply pour these loose particles into the cavity, ensuring the upper surface is flat.

[0060] Next, proceed to step S4, where the cladding plate is placed and the explosives are arranged. The cladding plate, after surface cleaning treatment, such as a 6mm thick TA2 industrial pure titanium plate, is placed flat on the pre-treated surface of the base ring 1. According to the process parameters for explosive welding, a 12mm explosive gap is established by placing a shim between the two. After the gap is set, an explosive layer with a specific detonation velocity and saturation, such as a 55mm thick emulsion explosive, is evenly spread on the upper surface of the cladding plate. To obtain the desired bonding interface, the detonation velocity of the explosive is controlled; for example, in this embodiment, the detonation velocity is controlled within the range of 1900m / s to 2200m / s. Subsequently, a central single-point detonation system is installed.

[0061] Following this, step S5, namely explosive welding, can be performed. After ensuring that all personnel and equipment have been evacuated to a safe area, the detonation device is detonated via a remote control system. The explosive layer detonates, generating a high-pressure shock wave. This shock wave propagates downwards, driving the cladding plate to impact the stationary base ring 1 surface at high speed. The metal jet formed near the impact point cleans the metal surface, and the subsequent high pressure causes both to undergo plastic deformation in the solid state, forming a metallurgical bond. During the explosion, the skeleton 3 and its internal filling material, located inside the base ring 1, together constitute a high-rigidity, high-inertia support system to resist the radial contraction force acting on the inner wall of the base ring 1 caused by the explosion pressure; the mechanical interlock between the dovetail protrusion 22 and the dovetail groove 21 provides support to prevent significant radial displacement of the base ring 1, helping to ensure the dimensional accuracy and interface bonding quality of the final composite ring.

[0062] After the explosion and site cleanup, step S6 is executed to recover the reusable skeleton 3. This recovery step S6 can be further divided into two sub-steps, S61 and S62.

[0063] First, sub-step S61 is performed, which involves cutting along the root of the dovetail groove 21. The operator uses a plasma cutting torch to make a circular cut along the root where the dovetail groove 21 connects to the base ring 1. Because the cutting cross-section is small, the workload is relatively small. Once this circular cut is completed, the physical connection between the skeleton 3 and the already composited base ring 1 is broken.

[0064] Subsequently, sub-step S62 is performed to lift the entire frame 3 out. The overhead crane is used again to lift the entire frame 3 from the inner cavity of the base ring 1. After lifting, simply tilting or flipping the frame 3 allows the loose granular filler inside to be dumped out by gravity. The recovered frame 3, especially the dovetail eaves 22, is cleaned and inspected to ensure it is undamaged before being stored for reuse in the next production task.

[0065] The composite ring after the explosion then enters the subsequent post-processing steps, such as stress-relief annealing at 540℃±10℃ for 4 hours, followed by leveling and polishing of the titanium surface, and 100% ultrasonic flaw detection. The test results show that its composite quality meets the requirements of Class I qualification in NB / T47013.3-2015 standard.

[0066] Through the aforementioned series of methods and steps, this embodiment manufactured an ultra-thick, large-diameter explosively welded composite ring. This method provides an improved solution to some problems existing in the prior art, such as cost, efficiency, and process complexity.

[0067] Example 2

[0068] This embodiment aims to elaborate in detail on a dedicated explosive welding apparatus for manufacturing ultra-thick, large-diameter explosively welded composite rings. This apparatus is the core physical carrier used in the manufacturing method described in Embodiment 1. The apparatus design integrates functions such as positioning, support, easy assembly and disassembly, and reusability. Its specific structural composition and the connection relationships between its components will be discussed in conjunction with the appendix. Figure 1 , Figure 2 and Figure 3 Please provide an explanation.

[0069] The explosive welding apparatus is in the following combined state before the explosive operation: Figure 1As shown, it mainly consists of a base ring 1 as the processing body and a skeleton 3 as a support and positioning tool. The base ring 1 is the main component of the final product, determining the matrix properties of the composite ring. In this embodiment, the base ring 1 is an annular part with a large diameter and large wall thickness, for example, its outer diameter is Φ3600mm, its inner diameter is Φ3000mm, and its thickness is 220mm. Its structural feature is that on the surface to be composited on one side of its inner cavity, there is a ring of dovetail grooves 21 continuously distributed along the circumference. Figure 3 As shown in the enlarged view, the dovetail groove 21 is machined by mechanical cutting and has a specific geometric profile, including a depth of 10 mm, an opening width of 30 mm, a groove bottom width of 20 mm, and a side wall inclination angle of 60°. These parameters together constitute a female structure for mechanical locking.

[0070] Corresponding to the base ring 1 is the core component of this invention, the reusable frame 3. The frame 3 is an overall high-rigidity cage-like structure made of Q345B steel, with an outer diameter smaller than the inner diameter of the base ring 1 to allow it to be inserted into its cavity. The frame 3 is designed to be modular, such as... Figure 2 As shown in the exploded view, it mainly includes the following connected sub-components.

[0071] First, there is a central support plate 31 located at the geometric center of the entire skeleton. It is a solid circular plate with a diameter of Φ2975mm and a thickness of 30mm, which serves as the central base of the entire skeleton structure.

[0072] Secondly, there are twelve radial reinforcing beams 32, which are vertically welded to the surface of the central support plate 31 and extend outward in a radial pattern, evenly distributed around the entire circumference. Each beam is 120 mm high and 20 mm wide. These radial reinforcing beams 32 constitute the main load-bearing structure of the skeleton 3.

[0073] Finally, there is an annular outer ring beam 33 with an overall outer diameter of Φ2995mm, which connects to the other end of all radial reinforcing beams 32 away from the central support plate 31, thereby connecting all radial reinforcing beams 32 into a closed ring.

[0074] Importantly, a continuous, annular dovetail protrusion 22 is provided on the outer circumferential surface of the outer ring beam 33. The cross-sectional shape and size of the dovetail protrusion 22 are designed and processed to match the dovetail groove 21 on the base ring 1, forming a male structure that can achieve engagement.

[0075] In practical use, i.e., in the assembled state of the device, the frame 3 is placed inside the cavity of the base ring 1. Its installation position and connection relationship are one of the characteristics of this device:

[0076] The dovetail protrusion 22 on the frame 3 mechanically engages with the dovetail groove 21 on the base ring 1. This engagement creates a rigid, weld-free connection between the frame 3 and the base ring 1. When an explosion occurs, the base ring 1 is compressed and tends to contract inward. The inclined sidewall of the dovetail groove 21 fits against the matching sidewall of the dovetail protrusion 22, generating shear resistance. This helps to prevent radial displacement of the base ring 1, providing support and positioning.

[0077] To further enhance the overall performance of the device, in a preferred embodiment, the three main components—the central support plate 31, the multiple radial reinforcing beams 32, and the outer ring beams 33—are spatially arranged to form an internal cavity with a large volume. This internal cavity can be used to accommodate filler material. Therefore, the device may further include loose granular filler material, such as a mixture of sand, gravel, iron filings, and perlite particles, filling the internal cavity. The presence of this filler material increases the inertia of the entire support system, helps to absorb and dissipate explosive energy, and improves the stability of the system.

[0078] When forming a complete, explosive-ready system, the device further includes a cladding plate, such as a 6mm thick TA2 titanium plate, placed on the composite surface of the base ring 1, and an explosive layer, such as a 55mm thick emulsion explosive with a detonation velocity in the range of 1900–2200 m / s, arranged above the cladding plate. All these components, including the base ring 1, the skeleton 3, optional fillers, the cladding plate, and the explosive layer, together constitute a fully functional manufacturing system ready for explosive welding.

[0079] In summary, the explosive welding apparatus disclosed in this embodiment, through its structural design, particularly the reusable modular frame 3 and the weld-free mechanical engagement between its unique dovetail eaves 22 and the dovetail grooves 21 on the base ring 1, constructs an internal support and positioning system. This apparatus provides a feasible technical solution for the manufacture of ultra-thick, large-diameter composite rings.

Claims

1. A method for manufacturing an ultra-thick, large-diameter explosively welded composite ring, characterized in that, Includes the following steps: S1. Pre-process a base ring (1) and process a ring-shaped dovetail groove (21) on the composite surface of the base ring (1). S2. A reusable frame (3) is provided, wherein the frame (3) is provided with a dovetail eave (22) that matches the dovetail groove (21). S3. The skeleton (3) is assembled into the inner cavity of the base ring (1) so that the dovetail eaves (22) and the dovetail groove (21) are mechanically engaged; S4. Place the composite plate on the surface to be composited of the base layer ring (1) and arrange explosives; S5. Perform explosive welding to form a composite ring.

2. The manufacturing method of the ultra-thick, large-diameter explosively welded composite ring according to claim 1, characterized in that, Between step S3 and step S4, there is also step S31: filling the internal cavity of the skeleton (3) with loose granular filler.

3. The manufacturing method of the ultra-thick, large-diameter explosively welded composite ring according to claim 1, characterized in that: After step S5, step S6 is also included: recovering the skeleton (3).

4. The manufacturing method of the ultra-thick, large-diameter explosively welded composite ring according to claim 3, characterized in that, Step S6 includes: S61. Cut along the root of the dovetail groove (21); S62. Lift out the entire skeleton (3).

5. A welding apparatus for the method according to any one of claims 1 to 4, characterized in that, include: A base ring (1), the inner cavity of which has a continuous dovetail groove (21) on the surface to be laminated; and A reusable skeleton (3) is disposed in the inner cavity of the base ring (1), and a continuous ring-shaped dovetail protrusion (22) is provided on the outer peripheral surface of the skeleton (3), the dovetail protrusion (22) precisely engaging with the dovetail groove (21).

6. The welding apparatus for ultra-thick, large-diameter explosively welded composite rings according to claim 5, characterized in that, The skeleton (3) includes: A central support plate (31); Multiple radially reinforcing beams (32), the bottom ends of which are connected to the central support plate (31); and An outer ring beam (33) is connected to one end of the plurality of radially reinforcing beams (32), and the dovetail eaves (22) are provided on the outer ring beam (33).

7. The welding apparatus for ultra-thick, large-diameter explosively welded composite rings according to claim 6, characterized in that: The central support plate (31), multiple radial reinforcing beams (32) and the outer ring beam (33) together form an internal cavity.

8. The welding apparatus for ultra-thick, large-diameter explosively welded composite rings according to claim 7, characterized in that: It also includes a loose granular filler that fills the internal cavity.

9. The welding apparatus for ultra-thick, large-diameter explosively welded composite rings according to claim 5, characterized in that: It also includes a composite board placed on the surface to be laminated of the base layer ring (1).

10. The welding apparatus for ultra-thick, large-diameter explosively welded composite rings according to claim 9, characterized in that: It also includes an explosive layer arranged above the cladding plate.

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