Laser ultrasonic torsion synchronous composite welding equipment and connecting method

Abstract

The invention relates to the technical field of connection, in particular to laser ultrasonic torsion synchronous hybrid welding equipment and a connection method.The laser ultrasonic torsion synchronous hybrid welding equipment comprises a laser welding device, the laser welding device emits laser to the to-be-welded position of a workpiece, and the workpiece is welded through the laser; the ultrasonic torsion welding device makes contact with the surface of the workpiece, ultrasonic waves are converted into reciprocating torsion motion, and reciprocating torsion friction is generated between the welding faces of the workpiece to weld the workpiece. A workpiece is clamped and fixed between the ultrasonic torsion welding device and the pressing device; the control device is connected with the laser welding device and the ultrasonic torsion welding device and used for controlling operation of the laser welding device and the ultrasonic torsion welding device. A workpiece is fixed through the pressing device and the ultrasonic torsion welding device, a traditional base is replaced, laser light path planning and clamp design are more convenient, and the equipment practicability is improved.

Description

Technical Field

[0001] This invention relates to the field of joining technology, and in particular to a laser-ultrasonic torsional synchronous composite welding device and joining method. Background Technology

[0002] Electric vehicles involve numerous connections of conductive materials such as copper and aluminum in the loading, control, and application of electrical energy. Currently, the welding of copper and aluminum conductive materials mainly employs ultrasonic welding and laser welding. Ultrasonic welded joints have excellent conductivity, but their mechanical properties are poor. Laser welding has a small contact area, high contact resistance, and is prone to defects such as weld porosity and cracks, affecting the reliability of electric vehicles. A single welding method cannot meet the future development requirements for the conductivity and mechanical reliability of joints in electric vehicle conductive component connections. Therefore, the coupled welding of ultrasonic welding and laser welding has been proposed to solve these problems.

[0003] However, the open hole of the existing longitudinal vibration ultrasonic welding head affects the transmission of ultrasonic energy, so the size of the open hole must be limited to a sufficiently small size. The laser spot welding beam and molten pool are prone to interference with the welding head. At the same time, traditional longitudinal vibration ultrasonic metal welding itself causes too much damage to the workpiece surface. Laser welding solidifies quickly, and the superposition of high stress and high brittleness of the weld point makes the workpiece more prone to cracking and damage. Furthermore, the penetration depth of traditional longitudinal vibration ultrasonic metal welding is too small, making it unsuitable for welding in confined spaces.

[0004] Therefore, this invention proposes a laser-ultrasonic torsional synchronous composite welding device and connection method to address the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a laser-ultrasonic torsional synchronous composite welding device and connection method to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention provides a laser-ultrasonic torsional synchronous composite welding device, comprising:

[0007] A laser welding device that emits a laser beam to the welding position of a workpiece and welds the workpiece using the laser.

[0008] An ultrasonic torsion welding device is provided, wherein the ultrasonic torsion welding device contacts the surface of the workpiece and converts ultrasonic waves into reciprocating torsion motion, thereby generating reciprocating torsion friction between the welding surfaces of the workpiece to weld the workpiece.

[0009] A clamping device is used to clamp and fix the workpiece between the ultrasonic torsion welding device and the clamping device.

[0010] A control device is connected to the laser welding device and the ultrasonic torsion welding device, and is used to control the operation of the laser welding device and the ultrasonic torsion welding device.

[0011] Preferably, the laser welding apparatus includes a laser electrically connected to a control device, the laser being connected to a laser welding head, the laser welding head facing the workpiece, and the laser beam emitted by the laser welding head being focused onto the position of the workpiece to be welded.

[0012] Preferably, the ultrasonic torsion welding device includes a drive module electrically connected to the control device, the drive module being driven by a torsion welding head, the torsion welding head making driving contact with the surface of the workpiece, and clamping and fixing the workpiece between the torsion welding head and the clamping device.

[0013] Preferably, the drive module includes an ultrasonic generator and a transducer that are electrically connected, and the transducer is driven by the torsion welding head to drive the torsion welding head to reciprocate.

[0014] Preferably, the output end of the transducer is driven by a transmission rod, and the end of the transmission rod away from the transducer is driven by an amplitude modulator, and the torsion welding head is mounted on the amplitude modulator.

[0015] Preferably, the ultrasonic torsion welding device further includes a pressure regulating module, which is connected to the torsion welding head to adjust the clamping pressure of the torsion welding head on the workpiece.

[0016] Preferably, the contact surface between the clamping device and the workpiece is provided with an anti-slip surface to prevent slippage between the workpiece and the clamping device.

[0017] Preferably, the torsion welding head and the laser welding head are located on the same side of the workpiece, the workpiece to be welded is clamped between the clamping device and the torsion welding head, and the laser beam passes through the center hole of the torsion welding head and irradiates the workpiece.

[0018] Preferably, the torsion welding head and the laser welding head are located on both sides of the workpiece, the workpiece to be welded is clamped between the clamping device and the torsion welding head, and the laser beam passes through the center hole of the clamping block on the clamping device and irradiates the workpiece.

[0019] This invention also discloses a connection method based on a laser-ultrasonic torsional synchronous composite welding device, comprising the following steps:

[0020] At least two workpieces are partially overlapped and then clamped at the overlapped portion of the workpieces using an ultrasonic torsion welding device and a clamping device.

[0021] Adjust the welding parameters of the laser welding device and the ultrasonic torsion welding device according to the welding requirements of the workpiece;

[0022] Start the laser welding device and the ultrasonic torsion welding device, and weld the workpieces together by means of laser welding and ultrasonic torsion welding coupling according to the set welding procedure, so that the overlapping workpieces are connected together.

[0023] After welding is completed, remove the welded workpiece.

[0024] Compared with existing technologies, this invention has the following advantages and technical effects: This invention discloses a laser-ultrasonic torsional synchronous composite welding device and connection method, which achieves high-quality welding of conductive materials by integrating a laser welding device and an ultrasonic torsional welding device. The laser welding device is responsible for emitting a laser to the workpiece to be welded to complete laser welding; the ultrasonic torsional welding device contacts the workpiece surface, converting ultrasonic waves into reciprocating torsional motion, and achieving welding through torsional friction between the welding surfaces; the clamping device is used to clamp and fix the workpiece, placing it between the ultrasonic torsional welding device and itself; through the combination and coordination of the laser welding device, the ultrasonic torsional welding device, the clamping device, and the control device, laser and torsional ultrasonic synchronous composite welding is achieved. Laser welding ensures high joint strength, while torsional ultrasonic welding increases the welding contact area and reduces resistance. The combination of the two gives the joint excellent conductivity and mechanical reliability, meeting the connection requirements of conductive materials in electric vehicles. Torsional ultrasonic welding causes minimal damage to the workpiece surface, and the coupling effect of laser and ultrasound avoids the cracking problems caused by high stress and high brittleness in traditional composite welding, reducing the risk of workpiece welding damage. The linear velocity in the central region of the torsional ultrasonic welding head is close to zero, which has little impact on welding quality. It allows for the creation of large-area through-holes, much larger than those used in laser welding, avoiding high-temperature ablation by the laser molten pool, reducing spatter erosion of the welding head, and improving welding quality. This makes it suitable for thicker workpieces and welding in confined spaces. The workpiece is fixed using a clamping device and an ultrasonic torsional welding device, replacing the traditional base, which facilitates laser path planning and fixture design, enhancing the equipment's practicality.

[0025] This invention couples torsional ultrasonic welding with laser technology, which can make fuller use of the advantages of the two heat sources and achieve high-quality welded connections. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0027] Figure 1This is a schematic diagram of the laser-ultrasonic torsion synchronous composite welding equipment according to Embodiment 1 of the present invention;

[0028] Figure 2 This is a schematic cross-sectional view of the workpiece according to Embodiment 1 of the present invention;

[0029] Figure 3 This is a schematic diagram of the laser-ultrasonic torsional synchronous composite welding equipment according to Embodiment 2 of the present invention;

[0030] Figure 4 This is a schematic cross-sectional view of the workpiece according to Embodiment 2 of the present invention;

[0031] Figure 5 This is a schematic diagram of longitudinal ultrasonic welding and laser welding coupled in the prior art;

[0032] Figure 6 This is a schematic diagram of the torsional ultrasonic welding method of the present invention;

[0033] In the diagram: 1. Laser welding device; 2. Ultrasonic torsion welding device; 3. Control device; 4. Clamping device; 5. Workpiece; 11. Laser; 12. Laser welding head; 15. Laser beam; 21. Ultrasonic generator; 22. Transducer; 23. Transmission rod; 24. Amplitude modulator; 25. Torsion welding head; 26. Voltage regulating module; 27. Center hole of torsion welding head; 41. Center hole of clamping block; 51. First welding surface; 52. Second welding surface. Detailed Implementation

[0034] 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.

[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] See appendix Figure 5The diagram shows a coupled longitudinal ultrasonic welding and laser welding. Traditional ultrasonic welding devices control the longitudinal vibration of the welding head to be parallel to the surfaces to be welded, so that the joint interfaces are rubbed together. However, this technology has the following drawbacks: (1) The opening of the longitudinal vibration ultrasonic welding head will affect the transmission of ultrasonic energy, so the size of the opening must be limited to a sufficiently small size. The laser spot welding beam and the molten pool are prone to interference with the welding head. (2) Traditional longitudinal vibration ultrasonic metal welding itself causes too much damage to the workpiece surface. Laser welding solidifies quickly, and the superposition of high stress and high brittleness of the weld point will make the workpiece more prone to cracking and damage. (3) The depth dimension of traditional longitudinal vibration ultrasonic metal welding is too small, which is not suitable for welding in narrow spaces.

[0037] The principle of torsional ultrasonic welding is as follows: Figure 6 The welding head generates welds through a reciprocating rotational motion. Because the amplitude remains within the welding area, energy is focused on the welding zone, enabling the welding of thicker workpieces. Furthermore, since force is applied directly to the weld interface and the amplitude in the transition zone of the weld is relatively small, damage to the workpiece is reduced.

[0038] Example 1

[0039] Reference Figures 1 to 2 As shown, this embodiment provides a laser-ultrasonic torsional synchronous composite welding device, comprising:

[0040] Laser welding device 1 emits a laser to the position to be welded on workpiece 5, and welds workpiece 5 by means of laser.

[0041] The ultrasonic torsion welding device 2 contacts the surface of the workpiece 5 and converts ultrasonic waves into reciprocating torsion motion, which drives the welding surfaces of the workpiece 5 to generate reciprocating torsion friction to weld the workpiece 5.

[0042] The workpiece 5 is clamped and fixed between the ultrasonic torsion welding device 2 and the clamping device 4.

[0043] Control device 3 is connected to laser welding device 1 and ultrasonic torsion welding device 2 and is used to control the operation of laser welding device 1 and ultrasonic torsion welding device 2.

[0044] This invention discloses a laser-ultrasonic torsional synchronous composite welding device and connection method. By integrating a laser welding device 1 and an ultrasonic torsional welding device 2, high-quality welding of conductive materials is achieved. The laser welding device 1 emits a laser to the workpiece 5 to be welded, completing the laser welding. The ultrasonic torsional welding device 2 contacts the surface of the workpiece 5, converting ultrasonic waves into reciprocating torsional motion, and achieving welding through torsional friction between the welding surfaces. A clamping device 4 is used to clamp and fix the workpiece 5, placing it between the ultrasonic torsional welding device 2 and itself. Through the combination and coordination of the laser welding device 1, the ultrasonic torsional welding device 2, the clamping device 4, and the control device 3, synchronous composite welding of laser and torsional ultrasonic welding is achieved. Laser welding ensures high joint strength, while torsional ultrasonic welding increases the welding contact area and reduces resistance. The combination of the two gives the joint excellent conductivity and mechanical reliability, meeting the connection requirements of conductive materials in electric vehicles. Torsional ultrasonic welding causes minimal damage to the surface of the workpiece 5, and the coupling effect of laser and ultrasound avoids the cracking problems caused by high stress and high brittleness in traditional composite welding, reducing the risk of welding damage to the workpiece 5. The linear velocity in the central region of the torsional welding head 25 is close to zero, which has little impact on welding quality. It allows for the creation of large-area through-holes much larger than the laser welding point area, avoiding high-temperature ablation by the laser molten pool, reducing spatter erosion of the welding head, and improving welding quality. This design is suitable for thicker workpieces 5 and welding in confined spaces. The workpiece 5 is fixed by the clamping device 4 and the ultrasonic torsional welding device 2, replacing the traditional base, which facilitates laser path planning and fixture design, enhancing the equipment's practicality. This invention couples torsional ultrasonic welding with laser technology, allowing for more efficient utilization of the advantages of both heat sources and achieving high-quality weld connections.

[0045] Further optimizing the design, the laser welding device 1 includes a laser 11 electrically connected to the control device 3. The laser 11 is connected to a laser welding head 12, which faces the workpiece 5. The laser beam 15 emitted by the laser welding head 12 is focused onto the welding position on the workpiece 5. The laser welding device 1 mainly consists of the laser 11 and the laser welding head 12. The laser 11 serves as the energy source, responsible for generating a high-energy-density laser beam 15 to provide a heat source for welding. The laser welding head 12 acts as the actuator, focusing, transmitting, and precisely controlling the laser beam 15 to achieve high-quality welding.

[0046] In one embodiment of the present invention, laser welding can be performed using continuous spot welding or pulsed welding.

[0047] In one embodiment of the present invention, the incident angle of the laser beam 15 is defined as the angle α between the laser beam 15 and the surface normal of the workpiece 5, which is in the range of 60°≤α≤120°.

[0048] In one embodiment of the present invention, the laser scanning method of the laser spot of the laser beam 15 can be O-shaped, C-shaped, S-shaped, or other paths.

[0049] Further optimizing the scheme, the ultrasonic torsion welding device 2 includes a drive module electrically connected to the control device 3. The drive module is driven by a torsion welding head 25, which makes transmission contact with the surface of the workpiece 5, clamping and fixing the workpiece 5 between the torsion welding head 25 and the clamping device 4. The drive module includes an ultrasonic generator 21 and a transducer 22 electrically connected. The transducer 22 is driven by the torsion welding head 25, driving the torsion welding head 25 to reciprocate. The output end of the transducer 22 is driven by a transmission rod 23, and the end of the transmission rod 23 away from the transducer 22 is driven by an amplitude modulator 24. The torsion welding head 25 is mounted on the amplitude modulator 24. The ultrasonic torsion welding device 2 is equipped with an ultrasonic generator, a transducer 22, a transmission rod 23, an amplitude modulator 24, and a torsion welding head 25. The ultrasonic generator converts the power frequency AC power into an ultrasonic frequency electrical signal and inputs it into the transducer 22. The output end of the transducer 22 is connected to the transmission rod 23. The transducer 22 generates high-frequency longitudinal vibration, which is applied to the amplitude modulator 24 through the transmission rod 23, thereby causing the amplitude modulator 24 to undergo high-frequency torsion, which in turn causes the welding head to undergo high-frequency torsion.

[0050] In one embodiment of the present invention, the drive module consisting of the ultrasonic generator and the transducer 22 is connected to the control device 3, which can adjust parameters such as torsional amplitude and frequency according to welding requirements, adapt to welding of workpieces 5 of different thicknesses and materials, and improve the flexibility of the equipment.

[0051] In one embodiment of the present invention, the amplitude modulator 24 can adjust the torsional amplitude to match the optimal amplitude for different workpieces 5, so as to avoid damage to the workpiece 5 due to excessive amplitude or weak welding due to insufficient amplitude.

[0052] In one embodiment of the present invention, the contact surfaces of different workpieces 5 form two welding surfaces, the first welding surface 51 is annular, and the second welding surface 52 is within the inner boundary of the annular first welding surface 51.

[0053] To further optimize the design, the ultrasonic torsion welding device 2 also includes a pressure regulating module 26. The pressure regulating module 26 is connected to the torsion welding head 25 and adjusts the clamping pressure of the torsion welding head 25 on the workpiece 5. The pressure regulating module 26 is connected to the torsion welding head 25 and can provide pressure to the torsion welding head 25 to adjust the clamping pressure of the torsion welding head 25 and the clamping device 4 on the workpiece 5, ensuring that the welding surfaces of the workpiece 5 are in close contact, avoiding uneven friction caused by contact gaps, enhancing the torsion friction effect, and reducing defects such as welding porosity and incomplete welding.

[0054] In one embodiment of the present invention, excessive clamping pressure can easily damage the surface of the workpiece 5, while insufficient pressure will result in insufficient friction. The pressure regulating module 26 balances the relationship between the two by precisely controlling the pressure, and is suitable for welding workpieces 5 of different materials or quantities.

[0055] To further optimize the design, an anti-slip surface is provided on the contact surface between the clamping device 4 and the workpiece 5 to prevent slippage between the workpiece 5 and the clamping device 4. The anti-slip surface increases the friction between the clamping device 4 and the workpiece 5, counteracting the displacement tendency of the workpiece 5 during torsional friction welding, preventing the workpiece 5 from slipping relative to the clamping device 4, ensuring the workpiece 5 remains in a fixed position during welding, avoiding welding deviations caused by displacement, and guaranteeing welding accuracy.

[0056] The scheme is further optimized so that the torsion welding head 25 and the laser welding head 12 are located on the same side of the workpiece 5. The workpiece 5 to be welded is clamped between the clamping device 4 and the torsion welding head 25. The laser beam 15 passes through the torsion welding head center hole 27 on the torsion welding head 25 and irradiates the workpiece 5. The torsion welding head 25 and the laser welding head 12 are set on the same side so that the torsion friction effect and the laser heating effect can act simultaneously on the welding area on the same side of the workpiece 5. The two effects are coupled more directly, improving the efficiency of composite welding. The linear velocity of the central area of ​​the torsion welding head 25 is close to zero. The torsion welding head center hole 27 does not affect the ultrasonic energy transmission. Moreover, the area of ​​the torsion welding head center hole 27 is much larger than that of the laser welding point, which can avoid the high temperature of the laser molten pool, prevent the welding head from being ablated, extend the service life of the torsion welding head 25, and solve the problem that the opening hole of the traditional longitudinal torsion welding head 25 is easily ablated by the laser.

[0057] In one embodiment of the present invention, the torsion welding head 25 and the laser welding head 12 are arranged on the same side so that the laser does not need to bypass the workpiece 5 or other components, the optical path is simpler, the energy loss and deviation during laser transmission are reduced, and the quality of laser welding is guaranteed.

[0058] In one embodiment of the present invention, the torsion welding head 25 is arranged on the same side as the laser welding head 12 to reduce the space occupied by the equipment on both sides of the workpiece 5, which is more suitable for welding conductive parts in the narrow space inside electric vehicles, and solves the problem that traditional longitudinal ultrasonic welding has a small depth and is not suitable for narrow spaces.

[0059] This invention also discloses a connection method based on a laser-ultrasonic torsional synchronous composite welding device, comprising the following steps:

[0060] At least two workpieces 5 are overlapped and then clamped at the overlapped part of the workpieces 5 by the ultrasonic torsion welding device 2 and the clamping device 4; at least two workpieces 5 are overlapped together, and the overlap area is larger than the area of ​​the torsion welding and clamping device 4; the overlap position of the workpieces 5 is placed between the clamping device 4 and the torsion welding head 25 for clamping and fixing; the laser welding device 1 and the ultrasonic torsion welding device 2 are turned on, so that the laser beam 15 passes through the center hole 27 of the torsion welding head and is focused on the welding area, and the angle of the laser beam 15 is perpendicular to the surface of the workpieces 5.

[0061] The welding parameters of the laser welding device 1 and the ultrasonic torsion welding device 2 are adjusted according to the welding requirements of workpiece 5. The ultrasonic welding parameters and laser welding parameters are set by the control device 3 respectively. The process parameters, such as laser power, laser spot diameter, spot welding time, ultrasonic energy, amplitude, pressure, etc., are set according to the material and thickness.

[0062] Start the laser welding device 1 and the ultrasonic torsion welding device 2. According to the set welding procedure, the workpiece 5 is welded by coupling laser welding and ultrasonic torsion welding to connect the overlapping workpieces 5 together. Welding begins. The ultrasonic torsion welding head 25 performs ultrasonic torsion welding on the fixed workpiece 5. At the same time, the laser beam 15 performs laser welding on the overlapping area of ​​the workpiece 5 located inside the annular welding head. The mechanical and thermal coupling effect of ultrasound and laser suppresses joint defects and improves the joint resistance and mechanical properties.

[0063] After welding is completed, remove the welded workpiece 5.

[0064] In one embodiment of the present invention, the torsion welding head 25 performs welding processing on the bottom surface of the workpiece 5 and the first welding surface 51 by torsion. At the same time as ultrasonic welding, the laser spot acts on the top surface of the workpiece 5 and performs laser welding on the second welding surface 52.

[0065] Example 2

[0066] See attached document Figure 2-4 As shown, the difference between this embodiment and Embodiment 1 is that the torsion welding head 25 and the laser welding head 12 are located on both sides of the workpiece 5. The workpiece 5 to be welded is clamped between the clamping device 4 and the torsion welding head 25. The laser beam 15 passes through the center hole 41 of the clamping block on the clamping device 4 and irradiates the workpiece 5. The torsion welding head 25 and the laser welding head 12 are arranged on both sides of the workpiece 5. The torsion welding head 25 provides torsional friction on one side of the workpiece 5, and the laser welding head 12 provides laser heating on the other side. The two actions act simultaneously on the welding area from both sides, which can achieve a more uniform energy distribution for workpieces with larger thicknesses.

[0067] In one embodiment of the present invention, the clamping device 4 has a central hole 41 for the clamping block to provide a transmission channel for the laser beam 15, thereby avoiding the clamping device 4 from blocking the laser. The area of ​​the central hole 41 can be much larger than the area of ​​the laser welding point, without affecting the clamping device 4's fixing effect on the workpiece 5.

[0068] In one embodiment of the present invention, the opposite-side layout allows torsional friction and laser heating to act on the workpiece 5 from both sides, so that the energy can penetrate deeper into the workpiece 5, solving the problems of insufficient penetration depth in laser welding, poor thickness adaptability in longitudinal ultrasonic welding, and poor welding effect on thick workpieces 5 in traditional welding.

[0069] In one embodiment of the present invention, the technical solution of Embodiment 2 is complementary to the one-sided layout of Embodiment 1, while the opposite-sided layout can provide an adaptation solution for workpieces 5 with different thicknesses and different installation spaces, further expanding the application range of the equipment.

[0070] In one embodiment of the present invention, the clamping device 4 is in a fixed state and does not move, and the center hole 41 of the clamping block does not affect the clamping device 4's fixation of the workpiece 5.

[0071] This invention also discloses a connection method based on a laser-ultrasonic torsional synchronous composite welding device, comprising the following steps:

[0072] At least two workpieces 5 are overlapped and then clamped at the overlapped part of the workpieces 5 by the ultrasonic torsion welding device 2 and the clamping device 4; at least two workpieces 5 are overlapped together, and the overlap area is larger than the area of ​​the torsion welding and clamping device 4; the overlap position of the workpieces 5 is placed between the clamping device 4 and the torsion welding head 25 for clamping and fixing; the laser welding device 1 and the ultrasonic torsion welding device 2 are turned on, so that the laser beam 15 passes through the center hole 27 of the torsion welding head and is focused on the welding area, and the angle of the laser beam 15 is perpendicular to the surface of the workpieces 5.

[0073] The welding parameters of the laser welding device 1 and the ultrasonic torsion welding device 2 are adjusted according to the welding requirements of workpiece 5. The ultrasonic welding parameters and laser welding parameters are set by the control device 3 respectively. The process parameters, such as laser power, laser spot diameter, spot welding time, ultrasonic energy, amplitude, pressure, etc., are set according to the material and thickness.

[0074] Start the laser welding device 1 and the ultrasonic torsion welding device 2. According to the set welding procedure, the workpiece 5 is welded by coupling laser welding and ultrasonic torsion welding to connect the overlapping workpieces 5 together. Welding begins. The ultrasonic torsion welding head 25 performs ultrasonic torsion welding on the fixed workpiece 5. At the same time, the laser beam 15 performs laser welding on the overlapping area of ​​the workpiece 5 located inside the annular welding head. The mechanical and thermal coupling effect of ultrasound and laser suppresses joint defects and improves the joint resistance and mechanical properties.

[0075] After welding is completed, remove the welded workpiece 5.

[0076] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, 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 this invention.

[0077] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A laser-ultrasonic torsional synchronous hybrid welding apparatus, characterized by, The utility model relates to a laser welding device (1) emits laser to the position of workpiece (5) to be welded, and the workpiece (5) is welded by laser, the ultrasonic torsional welding device (2) is contacted with the surface of workpiece (5), and the ultrasonic wave is converted into reciprocating torsional motion, and the reciprocating torsional friction between the welding surface of workpiece (5) is driven to weld workpiece (5), the pressing device (4) is fixed between the ultrasonic torsional welding device (2) and the pressing device (4) of workpiece (5), the control device (3) is connected with the laser welding device (1) and the ultrasonic torsional welding device (2), and the laser welding device (1) and the ultrasonic torsional welding device (2) are controlled to operate. The laser welding device (1) includes a laser (11) electrically connected to the control device (3), the laser (11) is connected with a laser welding head (12), the laser welding head (12) is directed to the workpiece (5), and the laser beam (15) emitted by the laser welding head (12) is focused and irradiated to the position of the workpiece (5) to be welded. The ultrasonic torsional welding device (2) includes a drive module electrically connected to the control device (3), the drive module is drivingly connected with a torsional welding head (25), the torsional welding head (25) is drivingly contacted with the surface of the workpiece (5), and the workpiece (5) is clamped and fixed between the torsional welding head (25) and the pressing device (4). The drive module includes an ultrasonic generator (21) and a transducer (22) electrically connected, the transducer (22) is drivingly connected with the torsional welding head (25), and drives the reciprocating motion of the torsional welding head (25). The output end of the transducer (22) is drivingly connected with a transmission rod (23), one end of the transmission rod (23) away from the transducer (22) is drivingly connected with an amplitude modulator (24), and the torsional welding head (25) is installed on the amplitude modulator (24).

2. The laser-ultrasonic torsional synchronous hybrid welding apparatus of claim 1, wherein: The ultrasonic torsional welding device (2) further includes a pressure regulating module (26) drivingly connected with the torsional welding head (25), and adjusts the clamping pressure of the torsional welding head (25) on the workpiece (5).

3. The laser-ultrasonic torsional synchronous hybrid welding apparatus of claim 2, wherein: The pressing device (4) is provided with a non-slip surface on the contact surface of the workpiece (5), to prevent slipping between the workpiece (5) and the pressing device (4).

4. The laser-ultrasonic torsional synchronous hybrid welding apparatus of claim 3, wherein: The torsional welding head (25) and the laser welding head (12) are located on the same side of the workpiece (5), the workpiece (5) to be welded is clamped between the pressing device (4) and the torsional welding head (25), and the laser beam (15) passes through the torsional welding head center hole (27) on the torsional welding head (25) and irradiates on the workpiece (5).

5. The laser-ultrasonic torsional synchronous hybrid welding apparatus of claim 4, wherein: ​ 6. The laser-ultrasonic torsional synchronous hybrid welding apparatus of claim 3, wherein: ​ 7. The laser-ultrasound torsional synchronous hybrid welding apparatus of claim 1, wherein: ​ 8. The laser-ultrasonic torsional synchronous hybrid welding apparatus of claim 3, wherein: ​ 9. The laser-ultrasonic torsional synchronous hybrid welding apparatus of claim 3, wherein: The torsional welding joint (25) and the laser welding joint (12) are located on both sides of the workpiece (5), the workpiece (5) to be welded is clamped between the pressing device (4) and the torsional welding joint (25), and the laser beam (15) passes through the center hole (41) of the pressing block on the pressing device (4) and irradiates on the workpiece (5).

10. A method of joining based on the laser-ultrasonic torsional synchronous hybrid welding apparatus according to any one of claims 1 to 9, characterized in that, It comprises the following steps: At least two workpieces (5) are partially overlapped and overlapped, and then clamped by the ultrasonic torsional welding device (2) and the pressing device (4) on the overlapping part of the workpiece (5); Adjust the welding parameters of the laser welding device (1) and the ultrasonic torsional welding device (2) according to the welding needs of the workpiece (5); Start the laser welding device (1) and the ultrasonic torsional welding device (2), and weld the workpiece (5) by laser welding and ultrasonic torsional welding coupling according to the set welding procedure, so that the overlapped workpiece (5) is connected together; After welding, the welded workpiece (5) is taken off.

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