Shell capable of preventing weld joint from cracking

Abstract

The utility model relates to a weld joint cracking prevention shell, which relates to the technical field of laser packaging and comprises a shell body made of an aluminum alloy material, a transition layer made of an oxygen-free copper material, a sealing ring made of a 304 stainless steel material and a cover plate. By additionally arranging the transition layer, the internal stress caused by the difference of thermal expansion coefficients of materials is reduced, so that the welding seam is effectively prevented from cracking, and the stability and the reliability of the product are improved.

Description

Technical Field

[0001] The present application relates to the technical field of laser packaging, and in particular to a shell that prevents weld cracking. Background Art

[0002] In the field of aerospace, lasers are widely used due to their high precision and high directivity. However, due to the particularity of the aerospace environment, extremely high requirements are placed on the packaging of lasers. Traditional laser packaging shells are mostly made of oxygen-free copper materials, but in order to meet the demand for lightweight, modern aerospace vehicles have begun to use aluminum alloys as the material for the packaging shell. When the temperature changes, aluminum alloys and commonly used 304 stainless steel sealing rings and cover plates will produce large internal stresses due to the difference in thermal expansion coefficients, causing weld cracking, which seriously affects the performance and life of the laser.

[0003] At present, although there are some technologies trying to solve this problem, such as adopting higher-level welding processes or improving material formulations, these methods are often costly and have limited effects. Therefore, how to effectively prevent weld cracking while ensuring lightweight has become a problem that needs to be solved urgently. Utility Model Content

[0004] The purpose of this application is to reduce the internal stress caused by the difference in thermal expansion coefficient of the materials, thereby effectively preventing weld cracking and improving the stability and reliability of the product.

[0005] The above technical purpose of the present application is achieved through the following technical scheme: a weld crack prevention shell, including a shell and a cover plate, the shell is surrounded to form an installation groove, a transition layer is provided at the notch of the installation groove, a sealing ring is provided on the side of the transition layer away from the shell, and the cover plate is provided on the side of the sealing ring away from the transition layer.

[0006] By adopting the above technical solution, the added transition layer can effectively reduce the internal stress caused by the sudden temperature change between the cover plate, the sealing ring and the shell substrate, effectively solve the problem of weld cracking caused by material differences, ensure that the shell maintains good structural integrity during long-term use, and greatly reduce the risk of failure caused by weld failure. The tightly connected components make it difficult for gaps to appear at the weld, which can effectively block the invasion of external impurities such as dust and water vapor, and provide more reliable protection for internal components. It can adapt to a wider range of working environments and temperature conditions, and can maintain good performance regardless of extreme cold or high temperature environments. It reduces the scrap and rework caused by weld cracking, while reducing the cost of later maintenance and replacement, and improving production efficiency and economic benefits.

[0007] Optionally, the transition layer is an oxygen-free copper frame, which is arranged on the shell along the notch of the installation groove.

[0008] By adopting the above technical solution, the oxygen-free copper frame serves as a transition layer. Its good ductility and toughness can effectively absorb and disperse the stress generated due to the difference in the thermal expansion coefficients of materials, reducing the stress concentration at the weld seam, thereby significantly reducing the possibility of weld seam cracking. Oxygen-free copper has excellent thermal conductivity, which helps to distribute heat more evenly during operation, avoiding material deformation and weld damage caused by local overheating, and improving the thermal stability of the housing. The oxygen-free copper frame can provide electromagnetic shielding function to a certain extent, reducing the influence of external electromagnetic interference on internal components and ensuring the normal operation of the equipment. The oxygen-free copper frame arranged along the notch of the installation groove can serve as an accurate positioning and assembly reference, helping to ensure the accurate installation positions of the sealing ring and the cover plate, and improving the overall assembly accuracy and consistency. Oxygen-free copper is relatively not easily corroded, and can protect the weld seam and the surrounding area in a harsh environment, extending the service life of the housing. Compared with using more complex or expensive solutions to prevent weld seam cracking, using the oxygen-free copper frame as a transition layer has a cost-effective advantage while achieving good results.

[0009] Optionally, the thickness of the transition layer is 1.8 mm to 3 mm.

[0010] By adopting the above technical solution, the thickness range of 1.8 mm - 3 mm can effectively buffer stress while not making the whole structure too bulky, maintaining the compactness of the housing and saving space. Such a thickness can provide sufficient support and protection for the weld seam, enhancing the overall strength of the housing so that it can withstand greater external forces and internal pressures. It avoids poor stress buffering effect due to too thin thickness and prevents material waste and cost increase caused by too large thickness, achieving a good balance between cost and performance. Under different working conditions such as temperature, pressure and vibration, the transition layer of this thickness can play a good role in ensuring the stability and reliability of the weld seam. The thickness of 1.8 mm - 3 mm is easy to process and control the accuracy during manufacturing, which is beneficial to improving production efficiency and the consistency of product quality. The appropriate thickness will not overly impede heat transfer, helping the heat inside the housing to dissipate and avoiding adverse effects on the weld seam and other components caused by local overheating.

[0011] Optionally, the sealing ring is made of 304 stainless steel.

[0012] By adopting the above technical solutions, the 304 stainless steel has good corrosion resistance, can remain stable in various environments, and effectively prevents the sealing ring from being corroded, which affects its sealing performance and structural integrity. The 304 stainless steel has high strength and rigidity, can provide reliable support and fastening for the outer shell, and ensure the stability and reliability of the seal. It is easy to process and form, can meet the requirements of the complex shape and high precision of the sealing ring, and ensure tight fit with other components. The surface is smooth, not easy to breed bacteria and pollutants, and is suitable for occasions with high hygiene requirements. It can still maintain its stable performance under a certain high-temperature environment, and ensure the normal use of the outer shell under high-temperature conditions. The appearance is bright, has good decorative properties, and is not easy to wear and fade after long-term use. While providing good performance, the cost of 304 stainless steel is relatively reasonable, and it has a high cost performance.

[0013] Optionally, the thickness of the sealing ring is 0.3 mm to 1.0 mm.

[0014] By adopting the above technical solutions, within the thickness range of 0.3 mm - 1.0 mm, the sealing ring can generate appropriate sealing pressure, effectively prevent the leakage of gases, liquids, etc., and ensure the sealing performance of the outer shell. It has sufficient strength to withstand external pressure and impact, and will not increase excessive weight due to excessive thickness, meeting the requirements of the product in terms of strength and lightweight. It avoids the need for frequent replacement or repair due to too thin a thickness, and also prevents excessive material costs caused by too large a thickness, achieving reasonable cost control. It can adapt to a variety of working conditions and environments, and maintain stable sealing performance under different temperature and pressure changes. Such a thickness is more convenient during installation and disassembly, will not be easily deformed and damaged due to being too thin, nor will it increase the operation difficulty due to being too thick. To a certain extent, it helps the uniform distribution and conduction of heat, reducing the deformation and sealing failure of the sealing ring caused by temperature changes. The appropriate thickness is easy to process and quality control during the production process, improving production efficiency and product consistency.

[0015] Optionally, the cover plate is made of 304 stainless steel.

[0016] By adopting the above technical solution, 304 stainless steel contains approximately 18% chromium and 8% nickel. Chromium can form a passivation film on the surface of the steel, preventing the metal from coming into contact with the outside world, protecting it from oxidation, and enhancing corrosion resistance. It can maintain good corrosion resistance in oxidizing acids, the atmosphere, and water media, effectively resisting the erosion of various acid, alkali, and salt solutions as well as the atmospheric environment, and extending the service life of the cover plate. It has relatively high strength and rigidity, can withstand a certain amount of external force and pressure, is not easily deformed or damaged, and ensures the structural stability of the cover plate. It is easy to carry out various processing operations, such as cutting, stamping, welding, etc., can meet the requirements of complex shapes and sizes of the cover plate, and at the same time maintain the accuracy and quality after processing. The surface is smooth, pore-free, and easy to clean, not easily prone to breeding bacteria and pollutants, and is suitable for environments with high hygiene requirements. It has a bright surface and good decorative properties, which can enhance the overall appearance of the product. It can still maintain stable performance in a certain high-temperature environment and adapt to some working conditions with higher temperatures. There is no need for surface treatment, and daily maintenance is simple, reducing the maintenance cost. It belongs to recyclable materials, meets environmental protection requirements, and is conducive to the recycling of resources. For example, in industries such as food processing, medical equipment, and chemical engineering, using cover plates made of 304 stainless steel can ensure that products are not contaminated, and at the same time facilitate the cleaning and maintenance of equipment; in some outdoor or harsh environments, its corrosion resistance and strength can ensure the long-term stable use of the cover plate.

[0017] Optionally, the thickness of the cover plate is in the range of 0.25 mm to 1.5 mm.

[0018] By adopting the above technical solution, a thickness of 0.25 mm - 1.5 mm can provide sufficient strength for the cover plate, enabling it to withstand a certain amount of external force impact and pressure, and protecting the internal components from damage. While ensuring strength, it will not make the cover plate overly heavy, which helps to reduce the weight of the entire housing, facilitating installation and transportation. It avoids waste of materials caused by an overly thick cover plate and reduces production costs. This thickness range is conducive to heat dissipation, avoiding overheating inside and ensuring the normal operation of the equipment. The thickness is appropriate, which helps the cover plate maintain good flatness and stability during processing and use, and is not easily prone to warping or deformation. It will not be fragile and easily damaged due to being too thin, nor will it increase the operation difficulty due to being too thick, improving the efficiency of installation and maintenance. It can adapt to different working environments and conditions and maintain good performance under circumstances such as vibration and temperature changes.

[0019] Optionally, the housing is made of aluminum alloy material.

[0020] By adopting the above technical solutions, the density of the aluminum alloy is relatively small, making the shell light in weight, convenient for carrying, installation and transportation, and reducing the weight and energy consumption of the overall equipment. Although light in weight, after appropriate treatment and alloying, it can still have high strength and hardness, and can provide sufficient protection and support for internal components. It helps to quickly transfer the heat generated inside to the outside, improve the heat dissipation efficiency, and ensure that the equipment operates within the normal temperature range. The aluminum alloy with surface treatment has good corrosion resistance and can maintain the integrity and stability of the shell in different environments. It is easy to carry out various machining operations, such as stamping, stretching, casting, etc., and can meet the manufacturing requirements of complex shapes and high precision. Aluminum alloy resources are abundant, the price is relatively low, and the production process is relatively mature, which can reduce the manufacturing cost of the shell. The surface can be treated in various ways, such as oxidation, painting, etc., and has good appearance effects. Aluminum alloy is a recyclable material, meeting the requirements of environmental protection and sustainable development.

[0021] In summary, the present application has at least the following beneficial effects:

[0022] 1. By adding an oxygen-free copper frame as a transition layer between the aluminum alloy shell and the 304 stainless steel sealing ring and cover plate, the internal stress caused by the difference in the thermal expansion coefficients of the materials is effectively reduced, thus preventing the problem of weld cracking.

[0023] 2. By reasonably setting the thicknesses of the oxygen-free copper frame, sealing ring and cover plate, not only the effect of reducing internal stress is ensured, but also the excessive increase in the weight of the encapsulated shell is avoided, meeting the lightweight requirements in the aerospace field. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of an anti-weld-cracking shell;

[0025] Figure 2 is an exploded view of an anti-weld-cracking shell.

[0026] REFERENCE SIGNS

[0027] 1. Shell; 2. Cover plate; 3. Installation groove; 4. Transition layer; 5. Sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following further describes the present application in detail with reference to the drawings.

[0029] In this embodiment, refer to Figure 1-2, A shell that prevents weld cracking, including a housing 1 made of aluminum alloy. The housing 1 encloses to form an installation groove 3. An oxygen-free copper frame is provided as a transition layer 4 at the notch of the installation groove 3. The thickness of the transition layer 4 is 2 mm to 3 mm, and preferably the thickness of the transition layer 4 is 2.5 mm. On the side of the transition layer 4 away from the housing 1, a sealing ring 5 made of 304 stainless steel is provided. The thickness of the sealing ring 5 is 0.3 mm to 1.0 mm, and preferably the thickness of the sealing ring 5 is 0.4 mm. On the side of the sealing ring 5 away from the transition layer 4, a cover plate 2 made of 304 stainless steel is provided. The thickness of the cover plate 2 is 0.25 mm to 1.5 mm, and preferably the thickness of the cover plate 2 is 0.4 mm. The transition layer 4 and the sealing ring 5 are connected by brazing, and the sealing ring 5 and the cover plate 2 are connected by parallel seam welding.

[0030] The implementation principle of Example 1 is as follows: By setting the oxygen-free copper frame as the transition layer 4, and utilizing the similar thermal expansion coefficients between oxygen-free copper, aluminum alloy, and 304 stainless steel, the internal stress caused by the difference in thermal expansion coefficients of materials is effectively reduced. At the same time, by reasonably setting the thicknesses of the oxygen-free copper frame, the sealing ring 5, and the cover plate 2, both the strength of the structure and the requirement of light weight are satisfied. The brazing connection method ensures the strength and sealing performance of the connection.

[0031] Example 2

[0032] The difference in this example is that the thickness of the transition layer 4 is 1.9 mm. By reducing the thickness of the oxygen-free copper frame, the weight of the encapsulation housing 1 can be further reduced, while still being able to effectively reduce the internal stress. The rest is the same as in Example 1.

[0033] Example 3

[0034] The difference in this example is that the thicknesses of the sealing ring 5 and the cover plate 2 are adjusted to 0.3 mm and 0.3 mm respectively. By adjusting the thicknesses of the sealing ring 5 and the cover plate 2, the weight of the encapsulation housing 1 can be further optimized while ensuring the structural strength. In addition, the thinner sealing ring 5 and cover plate 2 are also beneficial to heat conduction and dissipation, improving the heat dissipation performance of the laser. The rest is the same as in Example 1 or Example 2.

[0035] Example 4

[0036] The difference in this example is that a different welding method is adopted, that is, laser welding is used instead of brazing. Laser welding has the advantages of fast welding speed, high weld quality, and small heat-affected zone, which can further improve the connection strength and sealing performance of the encapsulation housing 1. At the same time, laser welding can also reduce the heat input during the welding process, thereby reducing the thermal impact on the materials. The rest is the same as in Example 1, Example 2, or Example 3.

[0037] Example 5

[0038] This embodiment discloses an improved anti-weld-cracking housing. The transition layer 4 adopts a double-layer structure design, that is, oxygen-free copper material is used for the inner layer, and the same aluminum alloy material as the housing 1 is used for the outer layer. Such a design can further reduce internal stress and improve the structural stability. At the same time, the double-layer structure design can also increase the structural strength of the encapsulation housing 1 and improve its ability to resist external impacts. Parameters such as the material, thickness, and welding method of the sealing ring 5 and the cover plate 2 can be adjusted according to actual requirements.

[0039] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited accordingly. In actual applications, various parts can be flexibly adjusted and optimized according to specific requirements and conditions. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application. For example, other suitable materials can be used to replace the oxygen-free copper frame, 304 stainless steel, etc.; the thickness of the transition layer 4, the sealing ring 5, and the cover plate 2 can be adjusted to meet different performance requirements; different welding methods can be used to improve the connection strength and sealing performance, etc. These equivalent changes should all be regarded as being included within the protection scope of this application.

[0040] The embodiments of this specific implementation manner are all the preferred embodiments of this application, and the protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. An anti-weld-cracking shell, characterized in that, It includes a housing (1) and a cover plate (2). The housing (1) encloses to form an installation groove (3). An over-layer (4) is provided at the notch of the installation groove (3). A sealing ring (5) is provided on the side of the over-layer (4) away from the housing (1). The cover plate (2) is provided on the side of the sealing ring (5) away from the over-layer (4).

2. The anti-weld-cracking housing according to claim 1, characterized in that, The over-layer (4) is an oxygen-free copper frame and is arranged on the housing (1) along the notch of the installation groove (3).

3. The anti-weld-cracking housing according to claim 1, wherein The thickness of the over-layer (4) is 1.8 mm to 3 mm.

4. A weld-crack prevention housing according to claim 1, wherein, The sealing ring (5) is made of 304 stainless steel.

5. The anti-weld-cracking housing according to claim 4, wherein The thickness of the sealing ring (5) is 0.3 mm to 1.0 mm.

6. The anti-weld-cracking housing according to claim 1, characterized in that, The cover plate (2) is made of 304 stainless steel.

7. The anti-weld-cracking housing according to claim 6, wherein The thickness of the cover plate (2) is 0.25 mm to 1.5 mm.

8. The anti-weld-cracking housing according to claim 1, characterized in that The housing (1) is made of aluminum alloy material.

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