A method for welding copper-aluminum and a laser welding method for metal thin film

Abstract

The application discloses a welding method for copper and aluminum, and relates to the technical field of laser penetration welding of ultra-thin copper foil. The laser light source used in the application is a continuous laser green light with a wavelength of 532nm and an average power of not less than 260W, so that the solder splashing during the welding process is reduced, and the reliability and safety of the welding process are improved.

Description

[0001] This application is a divisional application of Chinese invention patent application No. 202310928710.X, filed on July 27, 2023, entitled "A laser welding method for laser copper-copper metal thin films". Technical Field

[0002] This invention belongs to the field of ultrathin copper foil laser penetration welding, specifically, it relates to a welding method for copper and aluminum. Background Technology

[0003] Copper is a metallic element and a transition element, with the chemical symbol Cu and atomic number 29. Pure copper is a soft metal; its surface is reddish-orange with a metallic luster when freshly cut, and its elemental form is purplish-red. It has good ductility and high thermal and electrical conductivity, making it a commonly used material in cables and electrical / electronic components. It is also used as a building material and can be alloyed into numerous other materials.

[0004] Because of the significant differences in the physical and chemical properties of copper and aluminum, fusion welding of copper and aluminum will produce brittle phases, leading to embrittlement of the copper-aluminum weld joint and making it extremely prone to cracking. In other words, the strength of the copper-aluminum joint structure obtained by fusion welding is extremely low.

[0005] Therefore, finding an efficient and reliable method for copper-aluminum welding is an urgent problem to be solved. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a laser welding method for copper-copper metal thin films.

[0007] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: A laser welding method for copper-copper metal thin films includes the following steps: Step 1: Place the first copper body and the second copper body on the upper side of the feeding mechanism and position them so that a solder joint is formed between the first copper body and the second copper body; Step 2: Weld the joints using a high-power green laser, so that the laser beam generated by the high-power green laser penetrates the upper material of the first copper body and the second copper body, and forms a molten pool on the lower material of the first copper body and the second copper body, so as to achieve metallurgical welding of the first copper body and the second copper body.

[0008] Optionally, the feeding mechanism includes: an operating table, on the upper side of which two support plates are mounted, facilitating the mounting of the support plates on the upper side of the operating table; a first slide rail is formed on one side of each support plate, and a first motor is mounted inside the first slide rail, facilitating the mounting of the first motor inside the first slide rail; a first threaded rod is mounted at the output end of the first motor, facilitating the mounting of one end of the first threaded rod to the output end of the first motor; a sliding plate is threadedly engaged between the two first threaded rods; each end of the sliding plate has a first threaded hole, and the first threaded rod is threadedly engaged inside the first threaded hole, facilitating the threaded engagement of the sliding plate onto the first threaded rod through the first threaded hole; the sliding plate... A second slide rail is provided on one side, and a second motor is installed inside the second slide rail, facilitating the installation of the second motor inside the second slide rail. A second threaded rod is installed at the output end of the second motor, facilitating the installation of the second threaded rod at the output end of the second motor. A sliding block is threadedly engaged with the second threaded rod, and a connecting rod is installed at the bottom of the sliding block, facilitating the installation of the connecting rod at the bottom of the sliding block. A welding head is installed at the lower end of the connecting rod, facilitating the installation of the welding head at the lower end of the connecting rod. A second threaded hole is provided on one side of the sliding block, and the second threaded rod is threadedly engaged inside the second threaded hole, facilitating the sliding block to be threaded onto the second threaded rod through the second threaded hole.

[0009] Optionally, two connecting posts are installed on both sides of the sliding plate to facilitate the installation of the connecting posts on the sliding plate. An L-shaped plate is installed at one end of each connecting post to facilitate the installation of the L-shaped plate at one end of the connecting post. A first fixing cylinder is installed on one side of the L-shaped plate to facilitate the installation of the first fixing cylinder on one side of the L-shaped plate. A first sliding rod is slidably fitted at one end of the first fixing cylinder to facilitate the sliding of the first sliding rod inside the first fixing cylinder, improving the stability of the first sliding rod during sliding. A positioning plate is installed at one end of the first sliding rod to facilitate the installation of the positioning plate at one end of the first sliding rod. A first spring is installed between the positioning plate and the L-shaped plate to facilitate the reset of the positioning plate under the elastic action of the first spring. The upper side of the operating table is equipped with... Four first fixing blocks are provided to facilitate the mounting of the first fixing blocks on the upper side of the operating table. A third motor is mounted on one side of two of the first fixing blocks, facilitating the mounting of the third motor on one side of the first fixing block. A rotating roller is mounted on the output end of the third motor, facilitating the mounting of one end of the rotating roller on the output end of the third motor. A positioning post is mounted on one side of the first fixing block, facilitating the mounting of the positioning post on one side of the first fixing block. A second fixing block is mounted on one side of the positioning post, facilitating the mounting of the second fixing block on one side of the second fixing block. A push rod is mounted on one side of the second fixing block, facilitating the mounting of the push rod on one side of the second fixing block. A blade is mounted between two adjacent push rods, facilitating the mounting of the blade between the two push rods.

[0010] Optionally, the upper side of the operating table is elastically and slidably fitted with a positioning plate. A third slide rail is provided on one side of the positioning plate, and the blade slides inside the third slide rail, facilitating the sliding of the blade within the third slide rail. Both sides of the positioning plate are equipped with drive plates, facilitating the mounting of the drive plates on the positioning plate. The drive plates cooperate with the positioning disc. The bottom of the positioning plate is equipped with four guide rods and four second springs, facilitating the mounting of the guide rods and second springs on the bottom of the positioning plate. The second springs are sleeved around the periphery of the guide rods. The upper side of the operating table has two fourth slide rails and eight guide grooves. The guide rods slide inside the guide grooves. One end of the second spring is installed on the upper side of the operating table, facilitating the reset of the positioning plate under the elastic action of the second spring. The blade slides inside the fourth slide rail. The bottom of the operating table is equipped with multiple support feet, facilitating the support of the operating table through the support feet.

[0011] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all of the following advantages at the same time: The welding head is designed so that the connecting rod drives the welding head under the action of the sliding block, so that the sliding welding head can perform laser welding on the metal film placed on the upper side of the operating table. This reduces the problem of unstable welding quality caused by weld points that are too deep or too shallow, and makes the metal film welding process more convenient.

[0012] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0013] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings: Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of the structure at point A in the middle; Figure 3 for Figure 1 Schematic diagram of the structure at point B; Figure 4 for Figure 1 Schematic diagram of the structure at point C; Figure 5 for Figure 1 Schematic diagram of the structure at point D; Figure 6 This is a bottom view structural diagram of an embodiment of the present invention.

[0014] The attached diagram lists the components represented by each number as follows: Operating platform 1, support leg 101, first fixing block 102, third motor 103, rotating roller 104, support plate 105, first slide rail 106, first threaded rod 107, guide groove 108, fourth slide rail 109; Sliding plate 2, first threaded hole 201, second slide rail 202, second threaded rod 203, sliding block 204, second threaded hole 205, connecting rod 206, welding head 207; Connecting column 3, L-shaped plate 301, first fixed cylinder 302, first sliding rod 303, positioning plate 304, first spring 305; Positioning plate 4, third slide rail 401, drive plate 402, guide rod 403, second spring 404; Positioning pin 5, second fixing block 501, push rod 502, blade 503.

[0015] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0016] The invention will now be described in further detail with reference to the accompanying drawings.

[0017] Please see Figure 1-6 As shown, this embodiment provides a laser welding method for copper-copper metal thin films, including the following steps: Step 1: Place the first copper body and the second copper body on the upper side of the feeding mechanism and position them so that a solder joint is formed between the first copper body and the second copper body. The first copper body and the second copper body do not need any treatment and no transition layer is required. This effectively solves the welding problem of the first copper body and the second copper body and reduces the spatter that occurs during the welding of the first copper body and the second copper body. Step 2: Weld the joints using a high-power green laser. The laser beam generated by the high-power green laser penetrates the upper material of the first copper body and the second copper body, and forms a molten pool on the lower material of the first copper body and the second copper body, so as to achieve metallurgical welding of the first copper body and the second copper body.

[0018] When welding of the metal film is required, the metal film is first pulled out from the roller 104 and moved between the positioning plate 4 and the operating table 1. The connecting column 3 drives the L-shaped plate 301 to slide downward. The L-shaped plate 301 drives the first sliding rod 303 to slide downward through the first fixed cylinder 302. The first sliding rod 303 drives the drive plate 402 to slide downward through the positioning plate 304 and compresses the first spring 305. The drive plate 402 drives the positioning plate 4 to slide downward and position the metal film on the upper side of the operating table 1. The positioning plate 4 drives the guide rod 403 to slide inside the guide groove 108 and compress the second spring 404. Then the first motor is started. The output end of the first motor drives the sliding plate 2 to slide downward through the first threaded rod 107. Then the second motor is started. The output end of the second motor drives the sliding block 204 to slide through the second threaded rod 203. The sliding block 204 drives the welding head 207 to perform laser welding treatment on the contact point of the metal film through the connecting rod 206.

[0019] The welding head 207 is set so that the connecting rod 206 drives the welding head 207 under the action of the sliding block 204, so that the sliding welding head 207 can perform laser welding on the metal film placed on the upper side of the operating table 1, reducing the problem of unstable welding quality caused by excessively deep or shallow weld points, and making the metal film welding process more convenient.

[0020] The feeding mechanism of this embodiment includes: an operating table 1, with two support plates 105 mounted on the upper side of the operating table 1, facilitating the mounting of the support plates 105 on the upper side of the operating table 1. A first slide rail 106 is provided on one side of the support plate 105, and a first motor is installed inside the first slide rail 106, facilitating the mounting of the first motor inside the first slide rail 106. A first threaded rod 107 is installed at the output end of the first motor, facilitating the mounting of one end of the first threaded rod 107 on the output end of the first motor. A sliding plate 2 is threadedly engaged between the two first threaded rods 107. Both ends of the sliding plate 2 are provided with first threaded holes 201, and the first threaded rods 107 are threadedly engaged inside the first threaded holes 201, facilitating the sliding plate 2 to be threadedly engaged with the first threaded rods 107 through the first threaded holes 201. A second threaded rod 107 is provided on one side of the sliding plate 2. The slide rail 202 houses a second motor, facilitating its installation within the slide rail 202. A second threaded rod 203 is mounted on the output end of the second motor, allowing it to be mounted on the output end of the motor. A sliding block 204 is threaded onto the second threaded rod 203. A connecting rod 206 is mounted on the bottom of the sliding block 204, facilitating its installation on the bottom of the sliding block 204. A welding head 207 is mounted on the lower end of the connecting rod 206, facilitating its installation on the lower end of the connecting rod 206. A second threaded hole 205 is opened on one side of the sliding block 204, and the second threaded rod 203 is threaded into the second threaded hole 205, facilitating the sliding block 204's threaded engagement with the second threaded rod 203 through the second threaded hole 205.

[0021] In this embodiment, two connecting posts 3 are installed on both sides of the sliding plate 2, facilitating the installation of the connecting posts 3 on the sliding plate 2. An L-shaped plate 301 is installed at one end of the connecting post 3, facilitating the installation of the L-shaped plate 301 at one end of the connecting post 3. A first fixing cylinder 302 is installed on one side of the L-shaped plate 301, facilitating the installation of the first fixing cylinder 302 on one side of the L-shaped plate 301. A first sliding rod 303 is slidably fitted at one end of the first fixing cylinder 302, facilitating the sliding of the first sliding rod 303 inside the first fixing cylinder 302 and improving the stability of the first sliding rod 303 during sliding. A positioning plate 304 is installed at one end of the first sliding rod 303, facilitating the installation of the positioning plate 304 at one end of the first sliding rod 303. A first spring 305 is installed between the positioning plate 304 and the L-shaped plate 301, facilitating the reset of the positioning plate 304 under the elastic action of the first spring 305. The upper side of the operating table 1 is equipped with Four first fixing blocks 102 are provided to facilitate the mounting of the first fixing blocks 102 on the upper side of the operating table 1. A third motor 103 is mounted on one side of two of the first fixing blocks 102, facilitating the mounting of the third motor 103 on one side of the first fixing blocks 102. A rotating roller 104 is mounted on the output end of the third motor 103, facilitating the mounting of one end of the rotating roller 104 on the output end of the third motor 103. A positioning post 5 is mounted on one side of the first fixing block 102, facilitating the mounting of the positioning post 5 on one side of the first fixing block 102. A second fixing block 501 is mounted on one side of the positioning post 5, facilitating the mounting of the second fixing block 501 on one side of the positioning post 5. A push rod 502 is mounted on one side of the second fixing block 501, facilitating the mounting of the push rod 502 on one side of the second fixing block 501. A blade 503 is mounted between two adjacent push rods 502, facilitating the mounting of the blade 503 between the two push rods 502.

[0022] In this embodiment, the upper side of the operating table 1 is elastically and slidably fitted with a positioning plate 4. A third slide rail 401 is provided on one side of the positioning plate 4, and the blade 503 is slidably fitted inside the third slide rail 401, facilitating the sliding of the blade 503 inside the third slide rail 401. Both sides of the positioning plate 4 are equipped with drive plates 402, facilitating the installation of the drive plates 402 on the positioning plate 4. The drive plates 402 cooperate with the positioning disk 304. The bottom of the positioning plate 4 is equipped with four guide rods 403 and four second springs 404, facilitating the installation of the guide rods 403 and second springs 404. Located at the bottom of the positioning plate 4, the second spring 404 is sleeved around the guide rod 403. The upper side of the operating table 1 has two fourth slide rails 109 and eight guide grooves 108. The guide rod 403 is slidably engaged inside the guide grooves 108. One end of the second spring 404 is installed on the upper side of the operating table 1, which facilitates the positioning plate 4 to reset under the elastic action of the second spring 404. The blade 503 is slidably engaged inside the fourth slide rails 109. The bottom of the operating table 1 is equipped with multiple support feet 101, which facilitates the support of the operating table 1 by the support feet 101.

[0023] It should be noted that the laser source is a continuous green laser with a wavelength of 532nm and an average power of not less than 260 watts, used for copper-copper and copper-aluminum welding, with no spatter during welding.

[0024] This invention is not limited to the embodiments described above. Anyone should understand that structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention. Technical aspects, shapes, and structures not described in detail in this invention are all publicly known technologies.

Claims

1. A welding method for copper and aluminum, characterized in that, The laser source used is a continuous green laser with a wavelength of 532nm and an average power of not less than 260 watts.

2. The welding method for copper and aluminum according to claim 1, characterized in that, The method includes: pulling the metal film off the roller and moving it between the positioning plate and the operating table, and positioning the metal film on the upper side of the operating table.

3. The welding method for copper and aluminum according to claim 1, characterized in that, The method includes: starting a first motor, the output end of the first motor driving a sliding plate to slide downward through a first threaded rod, then starting a second motor, the output end of the second motor driving a sliding block to slide through a second threaded rod, and the sliding block driving a welding head to perform laser welding treatment on the contact area of ​​the metal film through a connecting rod.

4. The welding method for copper and aluminum according to claim 2, characterized in that, The method includes: After the metal film is pulled off the roller and moved to the positioning plate and the operating table, the connecting column drives the L-shaped plate to slide downward. The L-shaped plate drives the first sliding rod to slide downward through the first fixed cylinder. The first sliding rod drives the drive plate to slide downward through the positioning plate and compresses the first spring. The drive plate drives the positioning plate to slide downward and positions the metal film on the upper side of the operating table.

5. A laser welding method for metal thin films, characterized in that, Includes the following steps: Step 1: Place the first copper body and the second copper body on the upper side of the feeding mechanism and position them; Step 2: Welding is performed using a high-power green laser, which allows the laser beam generated by the high-power green laser to penetrate the upper material of the first copper body and the second copper body, forming a molten pool on the lower material of the first copper body and the second copper body, thereby achieving metallurgical welding of the first copper body and the second copper body.

6. The laser welding method for a metal thin film according to claim 5, characterized in that, The feeding mechanism includes: an operating table, two support plates mounted on the upper side of the operating table, a first slide rail opened on one side of the support plate, a first motor installed inside the first slide rail, a first threaded rod installed at the output end of the first motor, and a sliding plate threaded between the two first threaded rods. The output end of the first motor drives the sliding plate to slide downward through the first threaded rod. Both ends of the sliding plate are provided with first threaded holes, and the first threaded rod is threadedly fitted inside the first threaded hole. A second slide rail is provided on one side of the sliding plate, and a second motor is installed inside the second slide rail. A second threaded rod is installed at the output end of the second motor. A sliding block is threadedly fitted on the second threaded rod. A connecting rod is installed at the bottom of the sliding block, and a welding head is installed at the lower end of the connecting rod. The output end of the second motor drives the sliding block to slide through the second threaded rod, and the sliding block drives the welding head to perform laser welding treatment on the contact area of ​​the metal film through the connecting rod.

7. The laser welding method for a metal thin film according to claim 6, characterized in that, The sliding block has a second threaded hole on one side, and the second threaded rod is threaded into the inside of the second threaded hole. Two connecting posts are installed on both sides of the sliding plate. An L-shaped plate is installed at one end of the connecting post. A first fixing cylinder is installed on one side of the L-shaped plate. A first sliding rod is slidably fitted at one end of the first fixing cylinder. A positioning plate is installed at one end of the first sliding rod. A first spring is installed between the positioning plate and the L-shaped plate.

8. The laser welding method for a metal thin film according to claim 7, characterized in that, The upper side of the operating table is equipped with four first fixing blocks, and two of the first fixing blocks are equipped with a third motor on one side, and the output end of the third motor is equipped with a rotating roller. A positioning post is installed on one side of the first fixing block, a second fixing block is installed on one side of the positioning post, a push rod is installed on one side of the second fixing block, and a blade is installed between two adjacent push rods. The upper side of the operating table is elastically and slidably fitted with a positioning plate, and a third slide is provided on one side of the positioning plate, and the blade is slidably fitted inside the third slide.

9. The laser welding method for a metal thin film according to claim 8, characterized in that, Both sides of the positioning plate are equipped with drive plates. The drive plates cooperate with the positioning disk. The connecting column drives the L-shaped plate to slide downward. The L-shaped plate drives the first sliding rod to slide downward through the first fixed cylinder. The first sliding rod drives the drive plate to slide downward through the positioning disk and compresses the first spring. The drive plate drives the positioning plate to slide downward and positions the metal film on the upper side of the operating table. The bottom of the positioning plate is equipped with four guide rods and four second springs. The second springs are sleeved around the guide rods. The upper side of the operating table has two fourth slides and eight guide grooves. The guide rods are slidably fitted inside the guide grooves. One end of the second spring is installed on the upper side of the operating table.

10. The laser welding method for a metal thin film according to claim 9, characterized in that, The blade slides inside the fourth slide rail, and the bottom of the operating table is equipped with multiple support feet.

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