Clamping device for glass and metal laser welding and welding method

Abstract

The invention relates to the technical field of laser welding, in particular to a clamping device for glass and metal laser welding, a scanning strategy and a welding method. The clamping device adopts a modularized parallel clamping structure and is integrated with a tension and pressure sensor, high-precision adjustment and real-time monitoring of clamping force are achieved, and it is ensured that a welding interface stably reaches an optical contact state; the invention further provides a double-layer cross scanning strategy, through two laser scanning paths forming an included angle, the welding thermal stress is effectively relieved, and the welding quality is improved; the method adopts a nanosecond pulse laser, is low in cost and high in efficiency, is suitable for welding of various glass and metal materials, and has a good industrial application prospect.

Description

Technical Field

[0001] This invention relates to the field of laser welding technology, and in particular to the optimization of methods and apparatus for laser welding of glass and metal. Background Technology

[0002] Achieving a high-strength, high-sealing connection between glass and metal, two materials with vastly different physical properties, has always been a challenge in manufacturing. Traditional methods such as adhesive bonding, mechanical fastening, or high-temperature welding often introduce foreign objects at the joint, create stress concentrations, or damage the inherent properties of the materials. Laser welding technology, particularly utilizing the nonlinear absorption characteristics of glass to specific lasers, offers the possibility of direct connection between the two. Among these methods, using relatively inexpensive nanosecond pulsed lasers has emerged as a promising economic solution. Its core mechanism involves the laser first melting the metal, which then causes the glass to absorb heat and melt through thermal conduction, ultimately forming a common molten pool. However, this process has an extremely stringent prerequisite: the contact interface between the glass and the metal must achieve "optical contact," otherwise energy cannot be effectively transferred, and the weld will fail.

[0003] Chinese patent document CN120715456A discloses a clamping device and welding method for metal-glass laser welding. In this technical solution, the contact problem between metal and glass is solved mechanically. The device lifts the workpiece with a lifting platform, so that it fits against a glass pressure plate fixed above. The operator judges whether "optical contact" has been achieved by visually observing the appearance and disappearance of Newton's rings at the workpiece interface.

[0004] However, the aforementioned device has the following drawbacks. First, its control of clamping force is indirect, qualitative, and passive, relying entirely on the operator's experience and observation. It cannot provide precise and reproducible quantitative pressure values, nor can it monitor pressure changes caused by thermal cycling in real time during the welding process, making it difficult to guarantee the consistency and reliability of the process. Furthermore, the device requires the laser to pass through a "glass pressure plate," which is part of the device, for welding. This not only introduces an additional optical interface and potential energy loss but also complicates the process flow. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, a clamping device and welding method for laser welding of glass and metal are provided.

[0006] This invention is achieved through the following technical solution: Firstly, a laser welding method for glass and metal, comprising the following steps: S1. Polish the surface of the metal to be welded and clean the interface between the metal and the glass to be welded. S2. The processed metal and glass are clamped in a clamping device that can provide adjustable longitudinal pressure and monitor the pressure. Pressure is applied to make the contact interface between the metal and glass reach an optical contact state, and the pressure is monitored and adjusted in real time during the welding process. S3. A nanosecond pulsed laser is used to weld the interface area that has reached the optical contact state. A dual-layer scanning strategy is adopted during welding. In the same welding area, the first layer of scanning and filling is performed first, and then the second layer of scanning and filling is performed. The filling path of the second layer of scanning is rotated by an angle θ relative to the filling path of the first layer of scanning. The value of the angle θ is 0°≤θ≤180°.

[0007] In a preferred embodiment of the present invention, in step S3, the path shapes of the first layer scan filling and the second layer scan filling are the same in the dual-layer scanning strategy.

[0008] In a preferred embodiment of the present invention, in the dual-layer scanning strategy, both the first layer scanning fill and the second layer scanning fill adopt a bidirectional folding scanning method.

[0009] In a preferred embodiment of the present invention, when a bidirectional folding scanning method is used, the included angle θ between the first layer scanning fill path and the second layer scanning fill path is 90°.

[0010] In a preferred embodiment of the present invention, in the dual-layer scanning strategy, both the first layer scanning fill and the second layer scanning fill adopt a unidirectional repeating scanning method.

[0011] In a preferred embodiment of the present invention, when a unidirectional repeating scanning method is used, the included angle θ between the first layer scanning fill path and the second layer scanning fill path is 180°.

[0012] Secondly, a clamping device for laser welding of glass and metal includes: a base; a first plate and a second plate, which are arranged parallel to each other above the base, and the opposing surfaces of the first plate and the second plate are respectively provided with receiving portions for positioning the glass to be welded and the metal to be welded; a plurality of guide posts, the two ends of each guide post being fixedly connected to the base and the first plate, and the second plate being slidably sleeved on the guide post; a driving member, installed on the base, whose output end acts on the second plate to drive the second plate to move along the axial direction of the guide post; and a tension / compression sensor, disposed between the output end of the driving member and the second plate to detect the interaction force between the first plate and the second plate in real time.

[0013] In a preferred embodiment of the present invention, the receiving portion on the first plate is a first recessed groove adapted to the shape of the glass to be welded; the second plate is a flat plate, and the receiving portion on it is a second recessed groove adapted to the shape of the metal to be welded; a laser through hole is formed at the center of the first recessed groove.

[0014] In a preferred embodiment of the present invention, a display instrument is also included, which is electrically connected to the tension and compression sensors and is used to display the value of the interaction force in real time.

[0015] In a preferred embodiment of the present invention, a sensor slot plate is further included; the sensor slot plate is arranged parallel between the base and the second plate and is slidably sleeved on the guide post; a tension / compression sensor is assembled in a sensor mounting slot opened on the sensor slot plate; the output end of the driving member acts on the sensor slot plate, thereby driving the second plate to move through the tension / compression sensor.

[0016] Compared with the prior art, the present invention has the following beneficial effects: A laser welding method for glass and metal systematically solves the core challenges of nanosecond laser welding of glass-metal interfaces by integrating precision surface treatment, quantitative pressure control, and an innovative dual-layer cross-scanning strategy. The method first lays the foundation for high-quality metallurgical bonding by mirror polishing and interface cleaning of the metal surface. Then, a pressure-monitoring clamping device precisely establishes and maintains an "optical contact" state between the glass and metal, effectively suppressing welding plasma escape and ensuring efficient energy coupling and stable molten pool formation. Finally, dual-layer cross-scanning, using two laser scanning paths at an angle, effectively alleviates welding thermal stress and improves welding quality. This method significantly improves the strength, sealing performance, and reliability of the welded joint. Furthermore, by employing a nanosecond laser and possessing good process versatility, it achieves lower processing costs while maintaining high performance.

[0017] Furthermore, this method requires that the path shapes of the two scans be identical. This requirement ensures the regularity and predictability of the spatial distribution of welding heat input, allowing the laser energy to be regularly superimposed between the two layers, avoiding local thermal disturbances caused by abrupt path changes. The result is a more stable and controllable temperature field, effectively alleviating welding thermal stress, thereby obtaining welds with more uniform width, penetration depth, and microstructure, significantly improving the stability and repeatability of the process.

[0018] Furthermore, this method can specifically employ a bidirectional folding scanning approach. This approach achieves efficient and continuous heat input by reducing the idle travel of the laser head, and the folding connection between adjacent scan lines makes the heat input nearly continuous along the weld length. This helps reduce the temperature gradient and longitudinal stress along the weld direction, making the morphology and mechanical properties of the entire weld more consistent. At the same time, the periodic reversal of the local heat flow direction also has a positive effect on alleviating residual stress in specific directions.

[0019] Furthermore, the cross angle of the bidirectional scanning method is optimized to 90°. Orthogonal cross-scanning maximizes the dispersion and offset of residual welding stress, which is key to achieving optimal joint strength. The second vertical scanning heat input most effectively breaks the unidirectional stress field formed by the first scan, achieving mutual restraint and balance between thermal expansion and contraction in two vertical directions. This results in the most balanced "thermal relaxation" of the welding area, yielding a welded joint with the lowest internal stress and the most uniform microstructure.

[0020] Furthermore, this method can also employ a unidirectional, repetitive scanning approach. This approach allows each scan line to be independently heated on a relatively "cool" substrate, resulting in greater independence of heat input and facilitating precise control of interlayer temperature, making it particularly suitable for heat-sensitive materials. This "heating-cooling-adjacent reheating" cycle can generate specific overlaps in the heat-affected zones. When performing a second layer cross-scan, the new unidirectional heat input can interact with the directional microstructure formed in the first layer, refining the grains through cross-remelting, thereby optimizing the stress field while improving the microstructure.

[0021] Furthermore, the cross angle when using a unidirectional repeating scanning method is optimized to 180°. When using a unidirectional repeating scanning method, the 180° angle ensures that the direction of heat input in the second scan is completely opposite to that in the first scan, thereby most effectively counteracting the directional thermal stress and deformation accumulated due to unidirectional sequential heating.

[0022] A clamping device for laser welding of glass and metal provides a key hardware foundation for achieving quantitative pressure control in the aforementioned method. This device, through a stable "frame-slider" structure formed by guide posts and a sliding plate, ensures the precision and stability of the applied pressure direction. Integrating tension and compression sensors and a display instrument, it achieves, for the first time, real-time monitoring, digital display, and dynamic feedback of the clamping force. This enables the quantitative control and precise reproduction of the microscopic pressure required to establish "optical contact," completely changing the previous extensive method of estimation based on experience. It fundamentally guarantees the constant gap at the welding interface, significantly improving process consistency and success rate.

[0023] Furthermore, the first and second plates of the device are each equipped with a recess for fixing the glass and metal to be welded. The recess structure provides precise positioning of the workpiece, and by utilizing a design where the depth is slightly lower than the sample height, the clamping force is first transmitted through the plane of the plates, effectively converting concentrated loads into distributed loads. This protects the fragile glass edges and thin metal sheets from crushing or deformation, while lateral limiting prevents workpiece misalignment, laying a reliable mechanical foundation for stable clamping and precise welding.

[0024] Furthermore, the device is equipped with a display instrument electrically connected to the tension and compression sensors. This instrument visualizes and intuitively presents the clamping force information, enabling precise setting and recording of optimal process parameters. During welding, the dynamic changes in the instrument readings provide the operator with a direct window to monitor process stability, facilitating timely intervention and process analysis, and greatly enhancing the controllability and operability of the entire welding system.

[0025] Furthermore, the device also includes a sensor slot for supporting the tensile and compressive sensors. This intermediate component provides a stable, anti-rotation base for the sensors via a dedicated sensor mounting slot, ensuring the long-term reliability of the measurement reference. It optimizes the force transmission path into a clear serial "drive-sensing-execution" pattern, making the detection module an independent unit that is easy to install, calibrate, and maintain, thus improving the modular design and ease of use and maintenance of the device.

[0026] Other features and advantages of the present invention will be disclosed in detail in the following detailed description and accompanying drawings. Attached Figure Description

[0027] The invention will be further described below with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of the clamping device of the present invention; Figure 2 This is a schematic diagram of the structure of the first plate, the second plate, the sensor slot plate, and the base of the present invention; Figure 3 This is a schematic diagram of the dual-layer scanning strategy proposed in this invention; Figure 4 Optical images and metallographic images of the welded samples under different laser powers in Example 1; Figure 5 This is a schematic diagram of the shear strength of welded samples under different laser powers in Example 1; Figure 6 Optical images and metallographic images of the welded samples under different longitudinal pressures in Example 2; Figure 7 This is a schematic diagram of the shear strength of welded samples under different longitudinal pressures in Example 2; Figure 8 This is a shear strength diagram of the welded samples under different angles of the bidirectional return laser path in Example 3; Figure 9 This is a shear strength diagram of the welded sample under different angles of the unidirectional repeating laser path in Example 4.

[0028] The annotations in the attached figures are explained as follows: Fastener 1, guide post 2, first plate 3, second plate 4, tension / compression sensor 5, sensor slot plate 6, base 7, drive component 8, glass to be welded 10, metal to be welded 11, sensor mounting slot 61, first recessed slot 31, laser through hole 32, second recessed slot 41. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0030] In the following description, terms such as “inner,” “outer,” “upper,” “lower,” “left,” and “right” are used only to indicate orientation or positional relationship for the convenience of describing the embodiments and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0031] like Figures 1 to 2 As shown, a clamping device for laser welding of glass and metal, which can adjust and detect the magnitude of clamping force, includes a base 7; a first plate 3 and a second plate 4, which are arranged parallel to each other above the base 7, and the opposing surfaces of the first plate 3 and the second plate 4 are respectively provided with receiving portions for positioning the glass 10 to be welded and the metal 11 to be welded; a plurality of guide posts 2, the two ends of each guide post 2 being fixedly connected to the base 7 and the first plate 3 respectively, and the second plate 4 being slidably sleeved on the guide post 2; a driving member 8, which is installed on the base 7, and its output end acts on the second plate 4 to drive the second plate 4 to move axially along the guide post 2; and a tension / compression sensor 5, which is disposed between the output end of the driving member 8 and the second plate 4 to detect the interaction force between the first plate 3 and the second plate 4 in real time.

[0032] The drive component 8 is an M20*30 stainless steel hex bolt, with its threaded end screwed into the threaded hole in the center of the base 7. A tension / compression sensor 5 is mounted in a sensor mounting slot 61 on the sensor slot plate 6, located between the output end of the drive component 8 and the second plate 4. A handheld display instrument is electrically connected to the tension / compression sensor 5 to display the force value in real time. The first plate 3 has a first recess 31 for positioning the glass 10 to be welded and a square laser through-hole 32; the second plate 4 is a flat plate with a second recess 41 for positioning the metal 11 to be welded. This device provides precisely adjustable longitudinal pressure by rotating the drive component 8 at the bottom, and monitors this pressure in real time through the tension / compression sensor 5 and the display instrument.

[0033] Preferably, there are four guide posts 2, which pass through the four corners of the first plate 3, the second plate 4, the sensor slot plate 6 and the base 7 respectively. Fasteners 1 are assembled at both ends of each guide post 2, and the entire device is locked and connected by the fasteners 1.

[0034] In this embodiment, fastener 1 is an M5*80 304 stainless steel hex bolt; guide post 2 is a 304 stainless steel double-ended internal thread cylindrical pin with a Φ7*25*M5 through hole. The metal to be welded 11 can be copper, titanium alloy or stainless steel, and the glass to be welded 10 can be quartz glass, soda-lime glass or sapphire glass. This solution is suitable for welding a combination of multiple materials.

[0035] A laser welding method for glass and metal includes the following steps: S1. Polish the surface of the metal to be welded and clean the interface between the metal and the glass. Specifically, polish the upper surface of the metal to be welded with wet sandpaper of different grits, then polish it to a mirror finish with a polishing cloth and diamond polishing agent. Finally, spray alcohol on the contact surfaces of the metal and glass and dry them with a hair dryer. S2. The processed metal and glass are clamped in a clamping device that can provide adjustable longitudinal pressure and monitor the pressure. Pressure is applied to make the contact interface between the metal and the glass reach an optical contact state, and the pressure is monitored and adjusted in real time during the welding process. Specifically, after assembling the clamping device, the tension / compression sensor 5 and the display instrument are assembled and zeroed. The device is then inverted, and the glass 10 to be welded and the metal 11 to be welded are placed into the first recess 31 of the first plate 3 and the second recess 41 of the second plate 4, respectively. Then, the device is uprighted, and the drive component 8 is rotated to push the sensor slot plate 6 and the tension / compression sensor 5 upwards until the second plate 4 presses the copper sheet firmly onto the glass. The pressure value is monitored through the display instrument, and the drive component 8 is finely adjusted. Simultaneously, the formation of Newton's rings at the glass-metal interface is observed until the interface reaches optical contact. In this embodiment, a longitudinal pressure of approximately 200 MPa is applied and maintained.

[0036] S3. A nanosecond pulsed laser is used to weld the interface area that has reached the optical contact state. A dual-layer scanning strategy is adopted during welding. In the same welding area, the first layer of scanning and filling is performed first, and then the second layer of scanning and filling is performed. The filling path of the second layer of scanning is rotated by an angle θ relative to the filling path of the first layer of scanning. The value of the angle θ is 0°≤θ≤180°.

[0037] Specifically, a nanosecond pulsed laser is used. The nanosecond pulsed laser system is activated, the clamped component is placed on the processing platform, and the laser focal length is adjusted. A square welding pattern is drawn, and a dual-layer scanning strategy is used for path filling: both the first layer (fill 1) and the second layer (fill 2) use unidirectional repeating or bidirectional folding scanning paths, and the shapes of the two paths are identical; the second layer of filling path is rotated relative to the first layer of filling path by an angle θ (0°≤θ≤180°). For example... Figure 3 As shown, the scanning strategy can be divided into two modes: Scanning strategy 1, where each layer filling path is a bidirectional folding laser path and the angle between the first layer and the second layer is θ; Scanning strategy 2, where each layer filling path is a unidirectional repeating laser path and the angle between the first layer and the second layer is θ.

[0038] S4. After welding is completed, wait for the display instrument value to stabilize, then rotate to loosen the drive component 8 and remove the welded part.

[0039] Example 1: Verifying the effect of laser power on welding quality.

[0040] First, step S1 is performed: pretreatment of the materials to be welded. In this embodiment, quartz glass and T2 copper are selected as the welding objects. The surfaces of the copper sheet to be welded are successively polished with 80-grit, 240-grit, 600-grit, 1000-grit, and 2000-grit wet sandpaper. Then, a woolen polishing cloth is used with a 2.5-micron diamond polishing agent for rough polishing, followed by a velvet polishing cloth with a 0.5-micron diamond polishing agent for fine polishing until the surface achieves a mirror finish. Finally, alcohol is sprayed onto the polished surface of the copper sheet and the interface of the quartz glass to be welded, and then dried with a hair dryer to ensure that the bonding interface is clean and free of foreign matter.

[0041] Next, step S2 is performed: clamping and pressure control are achieved using a clamping device. The processed quartz glass and copper sheet are placed into the first recess 31 of the first plate 3 and the second recess 41 of the second plate 4 of the clamping device, respectively. The drive component 8 is rotated, and the pressure is monitored and adjusted via a display instrument until uniform Newton's rings are observed at the glass-metal interface, indicating that optical contact has been achieved. The stability is monitored in real time during the welding process.

[0042] Then, perform step S3: use a pulsed laser with a pulse width of 10-100 nanoseconds for welding. Place the clamped components on the laser processing platform and adjust the laser focal length. In the control software, set the welding strategy: adopt a dual-layer scanning strategy, with the first and second layer scanning fills using unidirectional or reciprocating scanning paths (in this example, scanning strategy 1 (bidirectional reciprocation) is used, and the included angle θ is set to 90°), and the path shapes are the same; to explore the optimal laser power, fix the scanning speed at 575mm / s, frequency at 50kHz, line spacing at 0.05mm, and other parameters; use the laser power as a variable, setting it to 50W, 60W, 70W, 80W, and 90W respectively for welding experiments.

[0043] like Figures 4 to 5 As shown, after welding is completed, once the pressure displayed on the device stabilizes, the drive mechanism is released and the weldment is removed. Macroscopic observation, metallographic analysis, and shear strength testing are then performed on the sample. Experimental results show that when the laser power is 70W, and with the same clamping pressure and the same dual-layer scanning strategy, the Newton's rings state at the weld interface is most complete and ideal, the weld formation is uniform and dense, and the weld joint achieves the highest shear strength.

[0044] Example 2: This example aims to verify the effect of different clamping pressures on welding quality. The basic steps are the same as in Example 1, except that the longitudinal pressure applied and maintained in step S2 is different. After the quartz glass and T2 copper are clamped and optically contacted, the longitudinal pressure on the interface is precisely controlled and maintained at 100MPa, 200MPa, and 300MPa by adjusting the drive component 8 and observing the display instrument. During laser welding, the same dual-layer scanning strategy as in Example 1 is adopted, with the laser power fixed at 70W, scanning speed at 575mm / s, frequency at 50kHz, and line spacing at 0.05mm.

[0045] After welding was completed and the sample was removed, it was tested and analyzed. The results are as follows: Figures 6 to 7 As shown, under a longitudinal pressure of 200 MPa, the weld interface exhibits the most ideal bonding state, with complete and uniform Newton's rings, minimal internal defects in the weld, and the corresponding weld joint shear strength reaches its peak value.

[0046] Example 3: This example verifies the effect of the included angle θ on the welding quality in the dual-layer scanning strategy 1.

[0047] The pre-operation preparation, clamping, and pressure control steps are the same as in Example 1, with a fixed laser power of 70W and a longitudinal pressure of 200MPa. In step S3, scanning strategy 1 is implemented: both the first layer filling (filling 1) and the second layer filling (filling 2) adopt a bidirectional folding scanning method, and the path shapes are the same. The key difference is that this embodiment compares the effects of rotating the second layer path relative to the first layer path by different angles θ.

[0048] The specific operation involves setting three scanning programs in the laser software, with θ angles of 0° (i.e., the two paths are completely in the same direction), 90° (i.e., the two paths are orthogonal), and 180° (i.e., the two paths are in opposite directions). Multiple samples are then welded under the same laser parameters.

[0049] like Figure 8 As shown, the post-weld shear strength test results clearly demonstrate that the welded joint achieved the highest shear strength when an orthogonal scanning strategy with an included angle θ of 90° was adopted.

[0050] Example 4: This example verifies the effect of the included angle θ on the welding quality in the dual-layer scanning strategy 2.

[0051] The preliminary steps are the same as in Example 1. In step S3, scanning strategy 2 is implemented: both the first layer filling (filling 1) and the second layer filling (filling 2) use a unidirectional repeating scanning method, and the path shapes are the same. Similarly, the effect of rotating the second layer scanning path relative to the first layer scanning path by different angles θ is studied. The laser parameters are fixed as follows: power 70W, scanning speed 575mm / s, frequency 50kHz, line spacing 0.05mm, and longitudinal pressure 200MPa.

[0052] like Figure 9 As shown in the figure, the post-weld test results indicate that, under the premise of using a unidirectional repeated scanning method, the welding strength is optimal when the included angle θ is 180°.

[0053] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. A laser welding method for glass and metal, characterized in that, Includes the following steps: S1. Polish the surface of the metal to be welded and clean the interface between the metal and the glass to be welded. S2. The processed metal and glass are clamped in a clamping device that can provide adjustable longitudinal pressure and monitor the pressure. Pressure is applied to make the contact interface between the metal and the glass reach an optical contact state, and the pressure is monitored and adjusted in real time during the welding process. S3. A nanosecond pulsed laser is used to weld the interface area that has reached the optical contact state. A dual-layer scanning strategy is adopted during welding. In the same welding area, the first layer of scanning and filling is performed first, and then the second layer of scanning and filling is performed. The filling path of the second layer of scanning is rotated by an angle θ relative to the filling path of the first layer of scanning. The value of the angle θ is 0°≤θ≤180°.

2. The laser welding method for glass and metal according to claim 1, characterized in that, In step S3, the path shapes of the first layer scan fill and the second layer scan fill are the same in the dual-layer scan strategy.

3. The laser welding method for glass and metal according to claim 2, characterized in that, In the dual-layer scanning strategy, both the first-layer scanning fill and the second-layer scanning fill adopt a bidirectional folding scanning method.

4. The laser welding method for glass and metal according to claim 3, characterized in that, When using a bidirectional folding scanning method, the angle θ between the first layer scan filling path and the second layer scan filling path is 90°.

5. A laser welding method for glass and metal according to claim 2, characterized in that, In the dual-layer scanning strategy, both the first-layer scanning fill and the second-layer scanning fill adopt a unidirectional repeating scanning method.

6. A laser welding method for glass and metal according to claim 5, characterized in that, When using a unidirectional repeating scanning method, the angle θ between the first layer scan fill path and the second layer scan fill path is 180°.

7. A clamping device for laser welding of glass and metal, characterized in that, include: Base (7); a first plate (3) and a second plate (4) are arranged parallel to each other above the base (7), and the opposite surfaces of the first plate (3) and the second plate (4) are respectively provided with receiving parts for positioning the glass (10) to be welded and the metal (11) to be welded; multiple guide posts (2), the two ends of each guide post (2) are respectively fixedly connected to the base (7) and the first plate (3), and the second plate (4) is slidably sleeved on the guide post (2); a driving member (8) is installed on the base (7), and its output end acts on the second plate (4) to drive the second plate (4) to move axially along the guide post (2); a tension and compression sensor (5) is arranged between the output end of the driving member (8) and the second plate (4) to detect the interaction force between the first plate (3) and the second plate (4) in real time.

8. A clamping device for laser welding of glass and metal according to claim 6, characterized in that, The receiving portion opened on the first plate (3) is a first sink (31) adapted to the shape of the glass (10) to be welded; the second plate (4) is a flat plate, and the receiving portion opened on it is a second sink (41) adapted to the shape of the metal (11) to be welded; a laser through hole (32) is started at the center of the first sink (31).

9. A clamping device for laser welding of glass and metal according to claim 6, characterized in that, It also includes a display instrument, which is electrically connected to the tension and compression sensor (5) and is used to display the value of the interaction force in real time.

10. A clamping device for laser welding of glass and metal according to claim 6, characterized in that, It also includes a sensor slot plate (6); the sensor slot plate (6) is arranged parallel between the base (7) and the second plate (4) and is slidably sleeved on the guide post (2); the tension and compression sensor (5) is assembled in the sensor mounting slot (61) opened on the sensor slot plate (6); the output end of the driving member (8) acts on the sensor slot plate (6), thereby driving the second plate (4) to move through the tension and compression sensor (5).

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