Electromagnetic pulse tube fitting welded structure
Patent Information
- Application Number
- CN202522372262.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-08
- Publication Date
- 2026-09-29
- Estimated Expiration
- 2035-11-08
AI Technical Summary
使用电磁脉冲焊接进行管与管的连接，内管需要有足够的刚度，否则易受冲击发生溃缩现象，导致无法实现薄壁管件焊接或影响焊接质量
[0012]本实用新型的有益效果是，夯实的硬质颗粒物在受到冲击时能够表现出类似固体的行为，均匀分散应力，避免局部应力集中，有效防止电磁脉冲焊接过程中内管因高速冲击而发生溃缩或变形，从而提高焊接质量的一致性，确保焊接接头的完整性和强度，确保薄壁管件的焊接接头质量，并保障焊接后内管的内径能够满足流动性需求。基于硬质颗粒物填充的灵活性，能够更好地适配不同内径的内管，封堵件一和封堵件二可拆卸并位于内管待焊区域之外的区域，焊接后能够正常取出，便于焊接后快速取出硬质颗粒物，取出的硬质颗粒物后续仍可再重复使用，解决了传统固体嵌件难以取出、重复利用性及尺寸适配性差的问题。
Smart Images
Figure CN224808652U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of electromagnetic pulse welding technology, and specifically relates to an electromagnetic pulse pipe welding structure. Background Technology
[0002] Electromagnetic pulse welding (EMB) is a solid-state joining technology that uses electromagnetic force to induce high-speed deformation and violent impact of the plates to be welded, thereby achieving a metallurgical bond. It features high joining efficiency, high joint strength, and is easily mass-produced due to its electric drive. When using EMB for pipe-to-pipe welding, the inner tube needs sufficient rigidity; otherwise, it is susceptible to collapse under impact, making it impossible to weld thin-walled pipes or affecting weld quality. Current conventional methods address this by placing solid inserts within the inner tube to provide radial support during welding. However, this approach suffers from problems such as difficulty in removing and reusing the solid inserts, assembly difficulties, and limitations on the size of the inner tube to be welded. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide an electromagnetic pulse pipe welding structure that effectively prevents the inner tube from collapsing or deforming due to high-speed impact during electromagnetic pulse welding, and has better radial support structure after welding, reusability, and size adaptability.
[0004] The present invention includes an outer tube and an inner tube. The welding area of the inner tube can be inserted inside the welding area of the outer tube. The welding area of the inner tube is filled and compacted with hard particles. The inner tube is provided with a detachable sealing component one and a sealing component two. The hard particles are confined between the sealing component one and the sealing component two. The sealing component one and the sealing component two are located inside the inner tube outside its welding area.
[0005] Furthermore, the hard particles are sand.
[0006] Furthermore, the sand is wet sand.
[0007] Furthermore, the wet sand is made by mixing dry sand and water in a volume ratio of 8:1.
[0008] Furthermore, the particle size of the dry sand is 70-120 mesh.
[0009] Furthermore, the first sealing component is a plug, and the second sealing component is a cotton towel or paper towel.
[0010] Furthermore, the stopper is a wooden stopper or a rubber stopper.
[0011] Furthermore, it also includes a sealing ring, which is fitted over the outside of the inner tube to be welded area and located between the outside of the inner tube to be welded area and the inside of the outer tube to be welded area.
[0012] The beneficial effects of this invention are that the compacted hard particles exhibit solid-like behavior when impacted, uniformly dispersing stress and avoiding localized stress concentration. This effectively prevents the inner tube from collapsing or deforming due to high-speed impact during electromagnetic pulse welding, thereby improving the consistency of welding quality, ensuring the integrity and strength of the welded joint, ensuring the quality of welded joints for thin-walled pipes, and ensuring that the inner diameter of the inner tube after welding meets flow requirements. Based on the flexibility of the hard particle filling, it can better adapt to inner tubes of different inner diameters. The first and second sealing components are detachable and located outside the welding area of the inner tube, allowing for normal removal after welding. This facilitates rapid removal of the hard particles after welding, and the removed hard particles can be reused subsequently, solving the problems of traditional solid inserts being difficult to remove, having poor reusability, and poor size adaptability. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the welding process of the pipe body welding structure of this utility model.
[0014] Figure 2 This is an exploded view of the pipe body welding structure of this utility model.
[0015] Figure 3 This is a simulation diagram of the stress distribution on the axial section during welding of this utility model.
[0016] Figure 4 This is a simulation diagram of the stress distribution on the axial section during welding using existing techniques.
[0017] In the diagram: 1. Outer tube; 2. Inner tube; 3. Hard particles; 4. Sealing component one; 5. Sealing component two; 6. Sealing ring; 7. Magnet collector; 8. Coil; 9. Actual welding area. Detailed Implementation
[0018] like Figure 1 and Figure 2 As shown, this utility model provides an electromagnetic pulse tube welding structure, including an outer tube 1 and an inner tube 2. The welding area of the inner tube 2 can be inserted into the welding area of the outer tube 1. The welding area of the inner tube 2 is filled and compacted with hard particles 3. The inner tube 2 is provided with a detachable sealing component 1 4 and a sealing component 2 5. The hard particles 3 are limited between the sealing component 1 4 and the sealing component 2 5 to limit the hard particles 3 during welding. The hard particles 3 form a radial support structure of the inner tube 2. The sealing component 1 4 and the sealing component 2 5 are located inside the inner tube 2 outside their welding area and are not easily affected by welding deformation force. After the outer tube 1 and the inner tube 2 are welded, the sealing component 1 4 and the sealing component 2 5 can still be removed normally.
[0019] When performing welding, such as Figure 1As shown, coil 8 is located outside magnet collector 7. Outer tube 1 and inner tube 2 are placed in the welding area of magnet collector 7. The welding area of inner tube 2 passes through the welding area of outer tube 1. Outer tube 1 and inner tube 2 are supported and limited by external supports or fixings to maintain their relative positions. The actual welding area 9 of outer tube 1 and inner tube 2 is... Figure 1 The area within the dashed box in the diagram. Before welding, the portion of the inner tube 2 corresponding to the actual welding area 9 must be filled and compacted with hard particles 3. That is, the portion filled and compacted by the hard particles 3 must completely cover the portion of the inner tube 2 corresponding to the actual welding area 9.
[0020] This invention utilizes hard particles 3 within the inner tube 2 to form radial support. The compacted hard particles 3 exhibit solid-like behavior upon impact, uniformly dispersing stress and preventing localized stress concentration. This effectively prevents the inner tube 2 from collapsing or deforming due to high-speed impact during electromagnetic pulse welding, thereby improving the consistency of welding quality, ensuring the integrity and strength of the welded joint, guaranteeing the quality of welded joints in thin-walled pipes, and ensuring that the inner diameter of the inner tube 2 meets flow requirements after welding. Based on the flexibility of the hard particles 3 filling, it can better adapt to inner tubes 2 with different inner diameters. The first and second sealing components 4 and 5 are detachable and located outside the welding area of the inner tube 2, allowing for normal removal after welding. This facilitates rapid removal of the hard particles 3 after welding, and the removed hard particles 3 can be reused subsequently, solving the problems of difficult removal, poor reusability, and poor dimensional adaptability of traditional solid inserts.
[0021] The hard particles 3 are sand. As a common natural material, sand is inexpensive and readily available, which greatly reduces the material cost of the welded support structure. It can also form a dense support through compaction, providing stable resistance to deformation under electromagnetic pulse impact. Furthermore, sand is easy to remove after welding, leaving no chemical substances or metal debris.
[0022] The sand is wet sand. The presence of moisture enhances the bonding force between sand grains, reduces particle displacement, and improves the stability and reliability of the support. Therefore, wet sand has higher cohesion and structural strength than dry sand, is less prone to loosening under impact, and can more effectively maintain the shape of the support and prevent the inner tube 2 from collapsing.
[0023] The wet sand is made by mixing dry sand and water in a volume ratio of 8:1 to ensure optimal cohesion and compactability of the wet sand.
[0024] The dry sand has a particle size of 70-120 mesh. Dry sand in this particle size range has a moderate particle size and a high specific surface area. When mixed with water, it can form strong cohesion and enhance the overall structural strength of the wet sand.
[0025] The first sealing component 4 is a plug, and the second sealing component 5 is a cotton towel or tissue. The plug provides a reliable one-way seal, preventing hard particles 3 from leaking out from one end of the inner tube 2. The cotton towel or tissue has good deformability; when clumped together and inserted into the inner tube 2, it can effectively form a seal and can better adapt to the sealing needs of inner tubes 2 of different sizes.
[0026] The stopper can be a wooden stopper or a rubber stopper. Wooden stoppers are low in cost and easy to process, while rubber stoppers have good elasticity, strong sealing performance, and can adapt to different pipe diameters and surface roughness. Both have good durability and reusability, which can reduce long-term production costs. To facilitate the removal of the stopper, a protrusion can be provided on the side of the stopper facing away from the hard particles 3 to facilitate clamping with tongs.
[0027] An example is an outer tube 1 made of aluminum with a diameter of 9.5 mm and a wall thickness of 0.7 mm, and an inner tube 2 made of copper with a diameter of 7 mm and a wall thickness of 0.5 mm. Fill the inner tube 2 with wet sand, compact it with a tool, plug one end of the wet sand, and plug the other end with a paper towel. Place the outer tube 1 and inner tube 2 in the welding area of the magnet collector 7, and use external supports or fasteners to support and limit the outer tube 1 and inner tube 2. Perform electromagnetic pulse welding, selecting a discharge energy of 30~36KJ, and a welding time of 10~20μs. The simulation diagram of stress distribution on the axial section of this embodiment is shown below. Figure 3 As shown.
[0028] The welding parameters, dimensions, and materials of the outer tube 1 and inner tube 2 are the same as in the embodiment, except that the hard particles 3, sealing component 1 4, and sealing component 2 5 are not placed in the inner tube 2. The stress distribution simulation diagram on the axial section of this comparative embodiment is shown below. Figure 4 As shown.
[0029] Based on the above embodiments and the stress distribution simulation diagrams on the axial cross-sections of the comparative examples, it can be seen that the stress concentration phenomenon is not obvious when using the welding structure of this utility model, and the hard particles 3 can provide sufficient support for the inner tube 2, which can minimize the deformation of the pipe fitting. In contrast, the stress concentration phenomenon is obvious in the pipe fittings without the welding structure of this utility model, and the welded joint will experience severe shrinkage.
[0030] in, Figure 1 and Figure 2 The outer tube 1 and inner tube 2 are shown only as examples; their actual lengths depend on the actual tube body to be welded. After welding, the plug and paper towel can be removed using tools such as clamps, and then the sand inside the inner tube 2 can be removed using rod tools such as a thin twist drill.
[0031] In a further preferred embodiment of this invention, a sealing ring 6 is also included. The sealing ring 6 is sleeved on the outside of the area to be welded of the inner tube 2 and located between the outside of the area to be welded of the inner tube 2 and the inside of the area to be welded of the outer tube 1. The sealing ring 6 is specifically a rubber sealing ring 6. During the welding process, when the outer tube 1 impacts the inner tube 2, the outer tube 1 is compressed by the sealing ring 6 and is hindered by it, which can increase the impact angle of the welding. When the impact angle is increased, electromagnetic pulse welding can be performed with lower energy. At the same time, after the outer tube 1 undergoes plastic deformation, it can tightly compress the sealing ring 6 to improve the sealing performance of the weld joint and meet the requirements of weld joints with high airtightness requirements.
[0032] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.
[0033] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.
Claims
1. A welding structure for an electromagnetic pulse tube fitting, characterized in that, The inner tube (2) includes an outer tube (1) and an inner tube (2). The area to be welded of the inner tube (2) can be inserted into the area to be welded of the outer tube (1). The area to be welded of the inner tube (2) is filled and compacted with hard particles (3). The inner tube (2) is provided with a removable sealing component 1 (4) and a sealing component 2 (5). The hard particles (3) are confined between the sealing component 1 (4) and the sealing component 2 (5). The sealing component 1 (4) and the sealing component 2 (5) are located in the inner tube (2) outside its area to be welded.
2. The electromagnetic pulse tube welding structure as described in claim 1, characterized in that, The hard particles (3) are sand.
3. The electromagnetic pulse tube welding structure as described in claim 2, characterized in that, The sand is wet sand.
4. The electromagnetic pulse tube welding structure as described in claim 3, characterized in that, The wet sand is made by mixing dry sand and water in a volume ratio of 8:
1.
5. The electromagnetic pulse tube welding structure as described in claim 4, characterized in that, The particle size of the dry sand is 70-120 mesh.
6. The electromagnetic pulse pipe fitting welding structure as described in any one of claims 1-5, characterized in that, The first sealing component (4) is a plug, and the second sealing component (5) is a cotton towel or a paper towel.
7. The electromagnetic pulse tube welding structure as described in claim 6, characterized in that, The stopper is a wooden stopper or a rubber stopper.
8. The electromagnetic pulse pipe fitting welding structure as described in any one of claims 1-5 and 7, characterized in that, It also includes a sealing ring (6), which is fitted on the outside of the area to be welded of the inner tube (2) and located between the outside of the area to be welded of the inner tube (2) and the inside of the area to be welded of the outer tube (1).