Laser welding method for dissimilar thin material pieces and application
By using an IPG laser to form a spiral welding trajectory on the surface of thin materials, the problems of welding strength of dissimilar thin materials and deformation of plastic parts are solved, achieving high-strength and reliable connection and high-quality welding.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HONGAN LISHEN POWER BATTERY SYST CO LTD
- Filing Date
- 2024-10-12
- Publication Date
- 2026-04-21
AI Technical Summary
Traditional welding methods result in the formation of metallic compounds between dissimilar thin materials, reducing weld strength and causing heat to deform surrounding plastic parts, thus failing to guarantee weld quality and strength.
An IPG laser is used to control the laser beam to form a spiral welding trajectory on the surface of thin materials, forming weld points and achieving reliable connection of dissimilar thin materials. Fixtures are used to ensure surface flatness, and impurities are removed by cleaning. The temperature is controlled to be below 140 degrees Celsius.
It achieves reliable connection between dissimilar thin materials, ensures welding strength and quality, avoids deformation of plastic parts, and achieves a peel strength of over 200N.
Smart Images
Figure CN121892831A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of welding technology, and in particular to a laser welding method and application for dissimilar thin materials. Background Technology
[0002] Currently, with the development of artificial intelligence towards larger screens and thinner and lighter designs, ordinary aluminum alloys are too weak to meet performance requirements. As a result, metal materials are being upgraded to stronger aluminum alloys, stainless steel, and even titanium alloys. Precise connections between dissimilar (i.e., different types) thin materials are becoming increasingly important.
[0003] If traditional welding methods are used, metal compounds will form between dissimilar thin materials after welding, reducing the welding strength and making it impossible to guarantee the welding strength and quality between dissimilar thin materials.
[0004] In addition, the heat generated during traditional welding can cause the plastic parts around the component to deform due to heat, which further affects the welding effect.
[0005] Therefore, there is an urgent need to develop a method that can solve the above-mentioned technical problems. Summary of the Invention
[0006] The purpose of this invention is to address the technical deficiencies of existing technologies by providing a laser welding method and application for dissimilar thin materials.
[0007] Therefore, the present invention provides a laser welding method for dissimilar thin materials, characterized by comprising the following steps:
[0008] Step S1: Place the first thin material to be welded on the second thin material to be welded, and make the two fit tightly together;
[0009] The first and second thin-film parts to be welded are made of different types of materials;
[0010] Step S2: Control the laser beam emitted by the IPG laser so that the laser beam forms a welding spot on the surface of the first thin material to be welded, and let the welding spot move on the surface of the first thin material to be welded according to the welding trajectory of a spiral shape to form a weld point, thereby welding the first thin material to be welded and the second thin material to be welded together.
[0011] In addition, the present invention also provides an application of the laser welding method between dissimilar thin materials as described above, which is applied in the field of battery manufacturing.
[0012] As can be seen from the technical solution provided by the present invention above, compared with the prior art, the present invention provides a laser welding method and application between dissimilar thin materials. Its design is scientific, which can realize a reliable connection between dissimilar thin materials, and ensure the welding strength and welding quality between dissimilar thin materials, which has great practical significance.
[0013] Furthermore, by applying the technical solution of the present invention, during the welding process, the temperature of the side of the second thin material to be welded away from the weld point is lower than 140 degrees Celsius, which makes it less likely for the plastic parts around the second thin material to be welded to deform due to heat, thus further ensuring the welding effect. Attached Figure Description
[0014] Figure 1 A flowchart illustrating the laser welding method between dissimilar thin materials provided by this invention;
[0015] Figure 2 A schematic diagram of a spiral-shaped welding trajectory in Embodiment 1, which is a laser welding method for dissimilar thin materials provided by the present invention.
[0016] Figure 3 This invention provides a laser welding method for dissimilar thin materials, and in Example 1, a photograph shows four weld points arranged in a square pattern formed by welding. Detailed Implementation
[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0019] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.
[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.
[0021] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.
[0022] See Figures 1 to 3 This invention provides a laser welding method for dissimilar thin materials, comprising the following steps:
[0023] Step S1: Place the first thin material to be welded on the second thin material to be welded, and ensure that the two are in close contact.
[0024] The first and second thin-film parts to be welded are made of different types of materials;
[0025] Step S2: Control the laser beam emitted by the IPG laser (i.e., fiber laser) to form a welding spot on the surface of the first thin material to be welded, and let the welding spot move (i.e. scan) on the surface of the first thin material to be welded according to the welding trajectory (i.e. welding path) in the shape of a spiral to form a weld point, thereby welding the first and second thin materials to be welded together.
[0026] The welding power of the IPG laser is 100-200W, and the laser beam movement speed during welding is 300-400mm / s.
[0027] Following step S2, the following steps are also included:
[0028] Step S3: By repeating step S2 multiple times, multiple non-overlapping solder joints (e.g., four) are formed.
[0029] In step S1, specifically, the thickness of the first thin material to be welded is 0.5mm-1mm;
[0030] The thickness of the second thin material to be welded, located below the first thin material to be welded, is 0.5mm-4mm;
[0031] In step S1, specifically, the material of the first thin material to be welded can be copper or stainless steel, and the material of the second thin material to be welded can be stainless steel or aluminum.
[0032] For example, in a specific implementation, the material of the first thin material to be welded is copper, and the material of the second thin material to be welded is stainless steel;
[0033] For example, in a specific implementation, the material of the first thin material to be welded is copper, and the material of the second thin material to be welded is aluminum;
[0034] For example, in specific implementation, the material of the first thin material to be welded is stainless steel, and the material of the second thin material to be welded is aluminum;
[0035] In step S1, specifically, the side opposite to the first and second thin materials to be welded is a flat and smooth plane.
[0036] It should be noted that in step S1, a fixture or other tool with clamping function is used to clamp the first and second thin material parts to be welded, ensuring that the surface of the thin material parts to be welded is flat and reducing the gap between the contact surfaces, thus preventing the gap between the two layers of material parts from being too large and causing incomplete welding.
[0037] In step S2, specifically, an IPG laser is used. By adjusting the relative position between the scanning galvanometer in the IPG laser and the thin material to be welded, the laser beam emitted by the IPG laser is controlled to pass through the scanning galvanometer. The scanning galvanometer deflects the laser beam to the field lens, and the field lens then focuses the laser beam onto the surface of the first thin material to be welded, forming a welding spot on the surface of the first thin material to be welded.
[0038] In step S2, specifically, for the spiral-shaped welding trajectory (i.e., welding path), the spiral pitch is 0.2 mm and the endpoint radius (i.e., outer radius) is 1.4 mm.
[0039] In step S2, specifically, the welding spot moves (scans) from the inside to the outside along a spiral shape on the surface of the first thin material to be welded.
[0040] Before step S1, that is, before welding, an alcohol solution or the like can be used to remove surface impurities from the first and second thin materials to be welded by means of immersion, spraying and ultrasonic cleaning, so that the surfaces of the first and second thin materials to be welded are free of impurities.
[0041] In step S2, specifically, the IPG laser has an operating power of 2000W and a single-mode core diameter of 14µm.
[0042] The laser beam emitted by the IPG laser passes through the Han's D30 galvanometer and forms a welding spot on the first thin material to be welded.
[0043] In step S2, specifically, when four non-overlapping solder joints are formed, the shape formed by connecting the center points of any two adjacent solder joints is a square. That is, four solder joints arranged in a square.
[0044] In step S2, specifically, the distance between the center points of any two adjacent solder joints is greater than the diameter of the solder joint.
[0045] Based on the above-mentioned solution of the present invention, under the action of the laser beam of the IPG laser, the first thin material to be welded is embedded downward into the second thin material to be welded, and similarly, the second thin material to be welded is embedded upward into the first thin material to be welded, so that the upper and lower material components form a "riveting" structure, realizing a reliable connection between dissimilar thin material components.
[0046] After testing, the peel strength of the weld joint can reach more than 200N, which fully demonstrates that the present invention can achieve a reliable connection between dissimilar thin materials and ensure the welding strength and welding quality between dissimilar thin materials.
[0047] To better understand the technical solution of the present invention, the following specific embodiments will be used to illustrate the technical solution of the present invention.
[0048] Example 1
[0049] Step S1: Place the first thin material to be welded on the second thin material to be welded, and ensure that the two are in close contact.
[0050] In Example 1, in step S2, the first thin material to be welded is made of copper with a thickness of 0.5 mm, and the second thin material to be welded is made of stainless steel with a thickness of 0.5 mm.
[0051] Step S2: The laser beam emitted by the IPG laser forms a welding spot on the surface of the first thin material to be welded, and scans along the spiral-shaped welding path to form a weld point.
[0052] Step S3 involves repeating step S2 multiple times to form four non-overlapping solder joints.
[0053] During welding, the power can be 100-150W, and the laser beam movement speed is 400mm / s. Under the action of the laser beam, the first thin material to be welded is inserted downward into the second thin material to be welded, and similarly, the second thin material to be welded is inserted upward into the first thin material to be welded, so that the upper and lower materials form a "riveting" structure, realizing a reliable connection between dissimilar thin materials.
[0054] In Example 1, before step S1, i.e. before welding, surface impurities of the first and second thin-film parts to be welded can be removed by means of immersion, spraying, and ultrasonic cleaning using an alcohol solution or the like. The cleaned first and second thin-film parts to be welded are then dried. On the welding table, a 0.5mm thick copper piece is placed on a 0.5mm thick stainless steel piece.
[0055] In Embodiment 1, in step S1, the first thin material to be welded is placed on the second thin material to be welded and tightly fitted. A jig or similar device can be used to clamp the first and second thin materials to be welded to ensure that the surface of the thin material to be welded is flat and to reduce the gap between the contact surfaces, thereby preventing the gap between the two layers of materials from being too large and causing incomplete welding.
[0056] In this first embodiment, a 2000W IPG single-mode 14µm core diameter laser is used. The relative position between the scanning galvanometer and the thin material to be welded is adjusted to control the laser beam emitted by the laser to pass through the scanning galvanometer. The galvanometer deflects the laser beam to the field lens, which then focuses the laser beam onto the surface of the first thin material to be welded, forming a welding spot on the surface of the first thin material to be welded. The welding spot formed on the surface of the first thin material to be welded by the laser beam scans along a spiral-shaped welding path to form a weld joint.
[0057] In Example 1, the welding spot scans from the outside in along a spiral-shaped welding path (i.e., welding trajectory) to form a spiral-shaped weld point, such as... Figure 2 As shown, the pitch of the helix is 0.2 mm and the outer radius is 1.4 mm.
[0058] See Figure 3 As shown, after welding, four weld points are formed in a square arrangement. The distance between the center points of any two weld points is greater than the diameter of the weld point, that is, the weld points do not overlap.
[0059] In Example 1, during welding, the welding power of the laser can be 100W-150W, and the laser beam moving speed during welding can be 400mm / s-440mm / s;
[0060] After welding, a tensile testing machine was used to verify the peel force. The verification showed that the peel force between the first and second thin material parts to be welded was 200N-300N. This indicates that the present invention can achieve a reliable connection between dissimilar thin material parts, ensuring the welding strength and welding quality between dissimilar thin material parts.
[0061] Based on the laser welding method between dissimilar thin materials provided by the present invention, the present invention also provides an application of the laser welding method between dissimilar thin materials, applied to the field of battery manufacturing technology, specifically for laser welding operations between different types of thin materials in the field of battery manufacturing.
[0062] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
Claims
1. A laser welding method for dissimilar thin materials, characterized in that, Includes the following steps: Step S1: Place the first thin material to be welded on the second thin material to be welded, and make the two fit tightly together; The first and second thin-film parts to be welded are made of different types of materials; Step S2: Control the laser beam emitted by the IPG laser so that the laser beam forms a welding spot on the surface of the first thin material to be welded, and let the welding spot move on the surface of the first thin material to be welded according to the welding trajectory of a spiral shape to form a weld point, thereby welding the first thin material to be welded and the second thin material to be welded together.
2. The laser welding method between dissimilar thin materials as described in claim 1, characterized in that, Following step S2, the following steps are also included: Step S3: By repeating step S2 multiple times, multiple non-overlapping solder joints are formed.
3. The laser welding method between dissimilar thin materials as described in claim 1, characterized in that, In step S2, the welding power of the IPG laser is 100-200W, and the laser beam moving speed during welding is 300-400mm / s; In step S1, the thickness of the first thin material to be welded is 0.5mm-1mm; the thickness of the second thin material to be welded located below the first thin material to be welded is 0.5mm-4mm.
4. The laser welding method between dissimilar thin materials as described in claim 1, characterized in that, The first thin material to be welded is made of copper or stainless steel, and the second thin material to be welded is made of stainless steel or aluminum.
5. The laser welding method between dissimilar thin materials as described in claim 4, characterized in that, The first thin material to be welded is copper, and the second thin material to be welded is stainless steel. or, The material of the first thin material to be welded is copper, and the material of the second thin material to be welded is aluminum; or, The first thin material to be welded is stainless steel, and the second thin material to be welded is aluminum.
6. The laser welding method between dissimilar thin materials as described in claim 1, characterized in that, The opposite side of the first and second thin material parts to be welded is a flat and smooth plane. In step S1, a fixture with clamping function is used to clamp the first and second thin material parts to be welded.
7. The laser welding method between dissimilar thin materials as described in claim 1, characterized in that, In step S2, for the spiral-shaped welding trajectory, the spiral pitch is 0.2 mm and the outer radius is 1.4 mm; In step S2, the welding spot moves from the inside to the outside along a spiral shape on the surface of the first thin material to be welded; In step S2, the distance between the center points of any two adjacent solder joints is greater than the diameter of the solder joint.
8. The laser welding method between dissimilar thin materials as described in claim 1, characterized in that, Before step S1, that is, before welding, surface impurities of the first and second thin materials to be welded are removed.
9. The laser welding method between dissimilar thin materials as described in claim 2, characterized in that, In step S2, when four non-overlapping solder joints are formed, the shape formed by connecting the center points of any two adjacent solder joints is a square, that is, four solder joints arranged in a square.
10. An application of the laser welding method between dissimilar thin materials as described in any one of claims 1 to 9, characterized in that, It is used in the field of battery manufacturing.