Double-ultrasonic self-adaptive auxiliary laser welding device and welding method

Abstract

The invention discloses a double-ultrasonic self-adaptive auxiliary laser welding device and a welding method. The double-ultrasonic self-adaptive auxiliary laser welding device comprises a mounting bracket and a laser welding gun mounted in the middle of the mounting bracket, a front-end ultrasonic vibration head and a rear-end ultrasonic vibration head which move synchronously with the laser welding gun are mounted on the mounting bracket and are respectively arranged at the front end and the rear end of the laser welding gun in the welding direction; an adjusting assembly used for adjusting the positions of the front-end ultrasonic vibration head and the rear-end ultrasonic vibration head is installed on the installation support. The adjusting assembly comprises a height adjuster and an angle adjuster connected to the end of the height adjuster. Compared with the prior art, the height and angle of the front-end ultrasonic vibration head and the rear-end ultrasonic vibration head can be adjusted through the adjusting assembly, self-adaptive adjustment of vibration pressure can be achieved according to different welded materials, the stirring effect on a molten pool is improved, and meanwhile the ultrasonic vibration heads can be prevented from scratching the surface of a weld joint.

Description

Technical Field

[0001] The present invention relates to the technical field of laser welding, and in particular to a dual-ultrasonic adaptive assisted laser welding device and a welding method. Background Art

[0002] Laser welding is a welding method that uses a focused laser beam as energy to bombard the workpiece and generate heat. Due to the optical properties of laser, such as refraction and focusing, laser welding is very suitable for welding micro parts and parts with poor accessibility. Laser welding also has the characteristics of low heat input, small welding deformation, and is not affected by electromagnetic fields.

[0003] As the cost of lasers decreases year by year, laser welding has been widely used in industrial production, especially in recent years, high-power laser welding has been more and more widely used. With the continuous improvement of laser power, especially the rapid development of high-efficiency laser welding above 10,000 watts, high-energy beam laser forms a narrow and deep weld during deep penetration welding. This type of weld has outstanding advantages such as high efficiency, low damage, and low deformation. However, there are also outstanding problems in the control of welding defects.

[0004] During the high-energy beam laser welding process, there are problems such as welding pores, inclusions, unfused, and cracks. Especially the problems of pores and cracks have seriously restricted the promotion and application of high-energy beam laser welding methods.

[0005] Chinese patent number CN119035771A discloses an ultrasonic-based laser welding device and a method of use, wherein the laser welding device includes a welding table, a laser welding unit, and an ultrasonic vibration unit. The top of the welding table is provided with a welding station. The laser welding unit can emit a laser beam to weld the workpiece to be welded. The laser welding unit is arranged on the welding table and is located above the welding station. The laser welding unit can move relative to the welding table to weld the workpiece to be welded along the joint seam; the ultrasonic vibration unit includes an ultrasonic transducer located on the side of the welding table, a horn connected to the ultrasonic transducer, and a vibration head connected to the horn.

[0006] The laser welding unit and ultrasonic vibration unit of the laser welding equipment disclosed above are independently arranged, and since there is a certain distance between the laser welding unit and the ultrasonic vibration unit, there is a risk of scratching the weld surface during welding due to excessive vibration pressure. At the same time, since different metals to be welded have different high-temperature liquid physical properties, the required vibration pressure is also different. It is difficult for the above-mentioned laser welding equipment to adjust the ultrasonic vibration unit according to different metals to be welded, and it is also difficult to achieve timely and sufficient uniform vibration and stirring of the molten pool by the ultrasonic vibration unit. The effect of suppressing welding defects is not obvious enough and is not stable enough. Summary of the Invention

[0007] The present invention aims to overcome the above-mentioned defects in the prior art and provide a dual ultrasonic adaptive assisted laser welding device and a welding method which have good welding effect and are applicable to welding different metals.

[0008] In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical scheme: a dual ultrasonic adaptive assisted laser welding device, comprising a mounting bracket and a laser welding gun installed in the middle of the mounting bracket; the mounting bracket is equipped with a front ultrasonic vibration head and a rear ultrasonic vibration head that move synchronously with the laser welding gun, and the front ultrasonic vibration head and the rear ultrasonic vibration head are respectively arranged at the front and rear ends of the welding direction of the laser welding gun; the mounting bracket is equipped with an adjustment component for adjusting the position of the front ultrasonic vibration head and the rear ultrasonic vibration head, and the adjustment component includes a height adjuster and an angle adjuster connected to the end of the height adjuster.

[0009] As a preferred solution of the present invention, the mounting bracket includes a bracket body and mounting support plates formed at opposite ends of the bracket body, the laser welding gun is installed in the middle of the bracket body, the adjustment assembly is installed at the connection between the mounting support plate and the bracket body, and a driving plate is provided on the back of the bracket body for driving the overall movement of the mounting bracket.

[0010] As a preferred solution of the present invention, the height adjuster includes a first support seat and a second support seat connected to the mounting support plate, a slider abutting the mounting support plate is provided between the first support seat and the second support seat, and a driving screw for driving the slider to rise and fall is installed on the bracket body.

[0011] As a preferred solution of the present invention, the slider is connected to a support rod that rises and falls synchronously with the slider, a guide seat for guiding the lifting and lowering of the support rod is installed at the bottom of the bracket body, and a pressure sensor for identifying the vibration amplitude of the ultrasonic vibration head is installed at the bottom of the support rod, and an angle adjuster is installed at the bottom of the pressure sensor.

[0012] As a preferred solution of the present invention, a driving motor for controlling the driving screw is installed on the bracket body, and a speed reducer for connecting to the driving screw is provided at the output end of the driving motor.

[0013] As a preferred solution of the present invention, the angle adjuster includes a connecting rod and an adjustment seat located at the bottom of the connecting rod. The connecting rod is connected to the pressure sensor, and a rotating clamp for adjusting the angle of the front ultrasonic vibration head or the rear ultrasonic vibration head is installed in the adjustment seat.

[0014] As a preferred solution of the present invention, the end of the front-end ultrasonic vibration head or the rear-end ultrasonic vibration head is sleeved with a clamp, and an adjustment shaft for controlling the rotation angle of the front-end ultrasonic vibration head or the rear-end ultrasonic vibration head is formed on the clamp. The rotating clamp is a hollow frame structure, and a first clamping seat and a second clamping seat for clamping the adjusting shaft are formed in the rotating clamp, and a locking bolt for tightening the first clamping seat and the second clamping seat to the adjusting shaft is installed on the rotating clamp. A smooth through hole is formed in the first clamping seat, and a threaded hole threadedly connected to the locking bolt is formed in the second clamping seat.

[0015] As a preferred solution of the present invention, a protective gas assembly corresponding to the rear end ultrasonic vibration head is installed on the mounting support plate, and the protective gas assembly includes a protective gas pipe connected to a fixed rod at the bottom of the fixed rod. A clamping seat for installing the fixed rod is provided on the mounting support plate, and an angle adjustment seat for adjusting the angle of the protective gas pipe is provided at the bottom of the fixed rod.

[0016] As a preferred solution of the present invention, the angle adjustment seat includes a clamping piece sleeved on the end of the protective air pipe and an adjusting sleeve rotatably connected to the bottom of the fixed rod, the clamping piece is formed with an angle adjustment head that can rotate along the radial direction of the adjusting sleeve, the angle adjustment head is inserted into the adjusting sleeve, and a roughening head is formed at the end of the angle adjustment head, an abutment piece for locking the rotation angle of the angle adjustment head is installed on the adjusting sleeve, the abutment piece abuts at the connection between the angle adjustment head and the roughening head, and a locking piece for locking the axial angle of the adjusting sleeve is provided at the end of the adjusting sleeve.

[0017] A welding method of a dual ultrasonic adaptive assisted laser welding device, based on the dual ultrasonic adaptive assisted laser welding device, is characterized by comprising the following steps: Step A: Install the mounting bracket on the welding robot, and sequentially install the front ultrasonic vibration head, laser welding gun, rear ultrasonic vibration head and shielding gas assembly arranged along the welding direction of the welding robot on the mounting bracket; Step B: Adjust the angular positions of the front ultrasonic vibration head and the rear ultrasonic vibration head to ensure that the front ultrasonic vibration head and the rear ultrasonic vibration head correspond to the front edge and the rear edge of the molten pool respectively; Step C: Under the action of the control system, the welding robot is controlled to perform welding along the set welding direction. During the welding process, the control system implements the vibration pressure collected by the receiving pressure sensor. The control system adjusts the height of the front ultrasonic vibration head and the rear ultrasonic vibration head by comparing the collected vibration pressure with the set pressure.

[0018] Compared with the prior art, the present invention has the following beneficial effects: by providing a front ultrasonic vibration head and a rear ultrasonic vibration head that move synchronously with the laser welding gun, stirring of the welding molten pool is achieved, which is beneficial to the overflow of gas in the molten pool, the floating of inclusions, the closure of unfused materials, and the fusion of cracks, and the molten pool can be stirred by ultrasonic vibration, thereby increasing the number of nuclei in the crystallization process of the molten pool, refining the grains, and improving the joint structure performance. At the same time, the height and angle of the front ultrasonic vibration head and the rear ultrasonic vibration head can be adjusted by an adjustment component, and the vibration pressure can be adaptively adjusted according to the different materials to be welded, thereby improving the stirring effect of the molten pool and preventing the ultrasonic vibration head from scratching the weld surface. The front ultrasonic vibrator head and the rear ultrasonic vibrator head correspond to the front edge and the rear edge of the molten pool respectively, so that the stirring effect on the liquid metal in the molten pool is more uniform and more sufficient, which is more conducive to avoiding the occurrence of welding defects; The front-end ultrasonic vibration head, laser welding gun, shielding gas assembly and rear-end ultrasonic vibration head are installed on the same mounting bracket to ensure the relative stability of each component during the movement; Different vibration pressures can be provided for different metals to be welded, and the vibration pressure of the ultrasonic vibration head can be adaptively adjusted during the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a front view of the present invention; Figure 3 It is a structural diagram of the angle adjuster; Figure 4 It is a structural diagram of the rear end ultrasonic vibration head; Figure 5 It is a schematic diagram of the structure of the shielding gas assembly; Figure 6 yes Figure 5 A partial enlarged view of point A in the middle; Figure 7 It is a schematic diagram of the present invention; Figure markings: mounting bracket 1, bracket body 11, mounting support plate 12, drive plate 13, guide seat 14, mounting seat 15, laser welding gun 2, front end ultrasonic vibration head 3, rear end ultrasonic vibration head 4, clamp 41, adjusting shaft 42, shielding gas assembly 5, angle adjustment seat 51, fixing rod 52, shielding gas pipe 53, adjusting sleeve 54, locking piece 55, clamping piece 56, angle adjustment head 57, upsetting head 58, abutment 59, height adjuster 6, drive motor 61, reducer 62, drive screw 63, first support seat 64, guide rod 65, slider 66, second support seat 67, support rod 68, angle adjuster 7, connecting rod 71, adjustment seat 72, rotating clamp 73, first clamping seat 74, second clamping seat 75, locking bolt 76, pressure sensor 8. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0021] like Figure 1-Figure 7 As shown, a dual ultrasonic adaptive assisted laser welding device includes a mounting bracket 1 and a laser welding gun 2 installed in the middle of the mounting bracket 1; the mounting bracket 1 is equipped with a front ultrasonic vibration head 3 and a rear ultrasonic vibration head 4 that move synchronously with the laser welding gun 2, and the front ultrasonic vibration head 3 and the rear ultrasonic vibration head 4 are respectively arranged at the front and rear ends of the welding direction of the laser welding gun 2; the mounting bracket 1 is equipped with an adjustment component for adjusting the position of the front ultrasonic vibration head 3 and the rear ultrasonic vibration head 4, and the adjustment component includes a height adjuster 6 and an angle adjuster 7 connected to the end of the height adjuster 6.

[0022] The front end ultrasonic vibration head 3 is located at the moving front end of the laser welding gun 2, the rear end ultrasonic vibration head 4 is located at the moving rear end of the laser welding gun 2, and the laser welding gun 2 is located between the front end ultrasonic vibration head 3 and the rear end ultrasonic vibration head 4. The front end ultrasonic vibration head 3, the laser welding gun 2 and the rear end ultrasonic vibration head 4 are arranged along the welding direction of the laser welding gun 2, and the front end ultrasonic vibration head 3, the laser welding gun 2 and the rear end ultrasonic vibration head 4 are located on the same straight line during the movement process.

[0023] The front end ultrasonic vibration head 3 and the rear end ultrasonic vibration head 4 located on the opposite sides of the laser welding gun 2 are both tilted toward the direction of the laser welding gun 2. The height adjuster 6 is used to adjust the height of the front end ultrasonic vibration head 3 and the rear end ultrasonic vibration head 4. The laser welding gun 2 is set vertically, and the angle adjuster 7 is used to adjust the inclination angle of the front end ultrasonic vibration head 3 and the rear end ultrasonic vibration head 4.

[0024] The front-end ultrasonic vibration head 3, the laser welding gun 2 and the rear-end ultrasonic vibration head 4 are installed on the same mounting bracket 1, so that the front-end ultrasonic vibration head 3, the laser welding gun 2 and the rear-end ultrasonic vibration head 4 can be synchronously driven to move synchronously under the action of driving the movement of the mounting bracket 1, thereby always ensuring that the front-end ultrasonic vibration head 3, the laser welding gun 2 and the rear-end ultrasonic vibration head 4 are in relative positions.

[0025] The mounting bracket 1 includes a bracket body 11 and mounting support plates 12 formed at opposite ends of the bracket body 11. The laser welding gun 2 is installed in the middle of the bracket body 11. The adjustment assembly is installed at the connection between the mounting support plate 12 and the bracket body 11, and a driving plate 13 is provided on the back of the bracket body 11 for driving the overall movement of the mounting bracket 1.

[0026] The mounting support plates 12 are vertically arranged at opposite ends of the mounting bracket 1 , and the driving plate 13 is connected to the welding robot. When the welding robot drives the driving plate 13 to move, the mounting bracket 1 is driven to move as a whole.

[0027] The height adjuster 6 includes a first support seat 64 and a second support seat 67 connected to the mounting support plate 12. A slider 66 is provided between the first support seat 64 and the second support seat 67 and abuts against the mounting support plate 12. A driving screw 63 for driving the slider 66 to rise and fall is installed on the bracket body 11.

[0028] The first support seat 64 and the second support seat 67 are both arranged horizontally, and the slider 66 is always in contact with the side of the mounting support plate 12, and the first support seat 64 and the second support seat 67 are provided with support bearings rotatably connected to the drive screw 63. Under the rotation action of the drive screw 63, the drive screw 63 and the slider 66 form a screw slider structure, so that under the rotation action of the drive screw 63, the slider 66 is lifted and lowered along the height direction of the mounting support plate 12, thereby realizing the control of the height of the slider 66.

[0029] A guide rod 65 passing through the slider 66 is provided between the first support seat 64 and the second support seat 67 . The guide rod 65 prevents the slider 66 from rotating, ensuring that the slider 66 is lifted and lowered along the height direction of the guide rod 65 .

[0030] The slider 66 is connected to a support rod 68 that rises and falls synchronously with the slider 66. A guide seat 14 is installed at the bottom of the bracket body 11 for guiding the support rod 68 to rise and fall, and a pressure sensor 8 for identifying the vibration amplitude of the ultrasonic vibration head is installed at the bottom of the support rod 68. An angle adjuster 7 is installed at the bottom of the pressure sensor 8.

[0031] The top of the support rod 68 is connected to the slider 66, and the support rod 68 is set through the guide seat 14 and the second support seat 67. Under the action of the guide seat 14 and the second support seat 67, the position of the support rod 68 during the lifting process is guided and limited. The support rod 68 is used to load the pressure sensor 8 while adjusting the height of the pressure sensor 8 under the action of the slider 66. At the same time, during the lifting process of the pressure sensor 8, the angle adjuster 7 is also driven to rise and fall synchronously.

[0032] A driving motor 61 for controlling a driving screw 63 is installed on the bracket body 11. A reducer 62 for connecting to the driving screw 63 is provided at the output end of the driving motor 61. The driving motor 61 is fixedly connected to the bracket body 11 by bolts. Under the action of the reducer 62, the output shaft of the driving motor 61 is decelerated, and the decelerated speed is transmitted to the driving screw 63, so as to realize accurate control of the driving screw 63.

[0033] The angle adjuster 7 includes a connecting rod 71 and an adjustment seat 72 located at the bottom of the connecting rod 71. The connecting rod 71 is connected to the pressure sensor 8. A rotating clamp 73 for adjusting the angle of the front ultrasonic vibration head 3 or the rear ultrasonic vibration head 4 is installed in the adjustment seat 72.

[0034] The end of the rotating clamp 73 is fixedly installed in the middle of the adjustment seat 72 by bolts, and the front end ultrasonic vibration head 3 or the rear end ultrasonic vibration head 4 is rotatably connected to the middle of the rotating clamp 73. The rotating clamp 73 is a hollow frame structure, and the front end ultrasonic vibration head 3 or the rear end ultrasonic vibration head 4 is set through the rotating clamp 73.

[0035] The end of the front end ultrasonic vibration head 3 or the rear end ultrasonic vibration head 4 is sleeved with a clamp 41, and an adjustment shaft 42 is formed on the clamp 41 for controlling the rotation angle of the front end ultrasonic vibration head 3 or the rear end ultrasonic vibration head 4. The rotating clamp 73 is a hollow frame structure, and a first clamping seat 74 and a second clamping seat 75 for clamping the adjusting shaft 42 are formed in the rotating clamp 73, and a locking bolt 76 for tightening the first clamping seat 74 and the second clamping seat 75 to the adjusting shaft 42 is installed on the rotating clamp 73. A smooth through hole is formed in the first clamping seat 74, and a threaded hole threadedly connected to the locking bolt 76 is formed in the second clamping seat 75.

[0036] The clamp 41 is sleeved on the end of the front end ultrasonic vibration head 3 or the rear end ultrasonic vibration head 4, and a bolt for locking the clamp 41 is provided on the clamp 41 to ensure that the clamp 41 is fixed at the end of the front end ultrasonic vibration head 3 or the rear end ultrasonic vibration head 4. The adjusting shaft 42 is arranged along the radial direction of the front end ultrasonic vibration head 3 or the rear end ultrasonic vibration head 4, so that the front end ultrasonic vibration head 3 or the rear end ultrasonic vibration head 4 can be adjusted along the radial direction of the adjusting shaft 42, thereby adjusting the inclination angle between the front end ultrasonic vibration head 3 or the rear end ultrasonic vibration head 4 and the laser welding gun 2.

[0037] The first clamping seat 74 and the second clamping seat 75 are respectively arranged on the upper and lower sides of the adjusting shaft 42, and the locking bolt 76 is installed from top to bottom. Under the action of the locking bolt 76, when the front ultrasonic vibration head 3 or the rear ultrasonic vibration head 4 is rotated to the required angle, the locking bolt 76 is tightened so that the top of the locking bolt 76 is against the first clamping seat 74, thereby pressing down on the first clamping seat 74. At the same time, the threaded section of the locking bolt 76 is threadedly connected to the second clamping seat 75, thereby pulling up on the second clamping seat 75, thereby realizing locking clamping of the adjusting shaft 42, ensuring the inclination angle of the front ultrasonic vibration head 3 or the rear ultrasonic vibration head 4.

[0038] A shielding gas assembly 5 corresponding to the rear end ultrasonic vibration head 4 is installed on the mounting support plate 12. The shielding gas assembly 5 includes a fixing rod 52 connected to a shielding gas pipe 53 at the bottom of the fixing rod 52. A clamping seat for installing the fixing rod 52 is provided on the mounting support plate 12. An angle adjustment seat 51 for adjusting the angle of the shielding gas pipe 53 is provided at the bottom of the fixing rod 52.

[0039] A mounting seat 15 for clamping the fixing rod 52 is mounted on the mounting support plate 12 , and a clamping hoop for clamping the fixing rod 52 is provided on the mounting seat 15 , so that the position of the mounting seat 15 clamping the fixing rod 52 can be adjusted by adjusting the tightness of the clamping hoop.

[0040] The angle adjustment seat 51 includes a clamping piece 56 that is sleeved on the end of the protective air pipe 53 and an adjusting sleeve 54 that is rotatably connected to the bottom of the fixed rod 52. The clamping piece 56 is provided with an angle adjustment head 57 that can rotate along the radial direction of the adjusting sleeve 54. The angle adjustment head 57 is inserted into the adjusting sleeve 54, and a roughening head 58 is formed at the end of the angle adjustment head 57. An abutment piece 59 for locking the rotation angle of the angle adjustment head 57 is installed on the adjusting sleeve 54. The abutment piece 59 abuts at the connection between the angle adjustment head 57 and the roughening head 58. The end of the adjusting sleeve 54 is provided with a locking piece 55 for locking the axial angle of the adjusting sleeve 54.

[0041] The adjusting sleeve 54 is arranged along the radial direction of the protective air pipe 53. Under the rotation action of the adjusting sleeve 54 on the fixing rod 52, the angle of the protective air pipe 53 along the axial direction can be adjusted. When the axial angle of the protective air pipe 53 is adjusted to the right position, the axial angle of the protective air pipe 53 can be locked by tightening the locking piece 55.

[0042] At the same time, the rotation of the angle adjustment head 57 can drive the rotation of the clamping member 56 , thereby adjusting the radial angle of the protective air pipe 53 . The upsetting head 58 is used to support the height of the angle adjustment head 57 .

[0043] A welding method of a dual ultrasonic adaptive assisted laser welding device, based on the dual ultrasonic adaptive assisted laser welding device, comprises the following steps: Step A: Install the mounting bracket 1 on the welding robot, and install the front ultrasonic vibration head 3, laser welding gun 2, rear ultrasonic vibration head 4 and shielding gas assembly 5 arranged along the welding direction of the welding robot on the mounting bracket 1 in sequence.

[0044] The laser welding gun 2 is connected to the laser. Under the action of the laser welding gun 2, the laser generated by the laser is transmitted to the surface of the metal to be welded. The metal to be welded is melted under the action of the laser energy to form a molten pool.

[0045] Step B: Adjust the angular positions of the front ultrasonic vibration head 3 and the rear ultrasonic vibration head 4 to ensure that the front ultrasonic vibration head 3 and the rear ultrasonic vibration head 4 correspond to the front edge and the rear edge of the molten pool respectively.

[0046] The shielding gas component 5 is located at the rear end of the rear ultrasonic vibration head 4. The shielding gas component 5 is used to conduct the inert shielding gas to the upper surface of the molten pool, isolating the molten pool and the high-temperature weld from the surrounding air to avoid oxidation.

[0047] Step C: Under the action of the control system, the welding robot is controlled to perform welding along the set welding direction. During the welding process, the control system implements the vibration pressure collected by the receiving pressure sensor 8. The control system adjusts the height of the front ultrasonic vibration head 3 and the rear ultrasonic vibration head 4 by comparing the collected vibration pressure with the set pressure.

[0048] During the welding process, the front end ultrasonic vibration head 3, the laser welding gun 2, the rear end ultrasonic vibration head 4 and the shielding gas assembly 5 are installed on the same mounting bracket 1, ensuring that the front end ultrasonic vibration head 3, the laser welding gun 2, the rear end ultrasonic vibration head 4 and the shielding gas assembly 5 are always in a synchronized state during the movement along the welding direction during the welding process. At the same time, the front end ultrasonic vibration head 3 and the rear end ultrasonic vibration head 4 can be adjusted in height under the action of the height adjuster 6.

[0049] The front-end ultrasonic vibration head 3 and the rear-end ultrasonic vibration head 4 convert the ultrasonic electrical signal into the mechanical motion signal of the vibration head through the transducer, so that the ultrasonic vibration head performs ultrasonic vibration. The ultrasonic vibration acts on the edge of the surface molten pool of the metal to be welded, stirring the molten pool, which can be beneficial to the overflow of gas in the molten pool, the floating of inclusions, the closure of unfused parts, and the fusion of cracks. It can also stir the molten pool through ultrasonic vibration, increase the number of nucleations in the crystallization process of the molten pool, refine the grains, and improve the joint structure performance.

[0050] Due to the different high-temperature liquid physical properties of different metals to be welded, the required vibration pressure is also different. For example, liquid metal with higher viscosity requires greater vibration pressure, while liquid metal with lower viscosity requires less vibration pressure. In addition, it is also necessary to avoid the ultrasonic vibration head scratching the weld surface during the welding movement due to excessive vibration intensity.

[0051] Appropriate vibration pressure is set for different metals to be welded. During the welding process, the pressure sensor 8 installed between the support rod 68 and the connecting rod 71 collects the vibration pressure in real time and transmits it to the control system. The control system compares it with the set pressure and determines whether the vibration head should be raised to reduce the vibration pressure or lowered to increase the vibration pressure based on the comparison result. The control system controls the motor to realize the raising and lowering of the vibration head.

[0052] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is to be embodied in the widest possible manner consistent with the principles and novel features disclosed herein.

[0053] Although this article uses the following figures more frequently: mounting bracket 1, bracket body 11, mounting support plate 12, drive plate 13, guide seat 14, mounting seat 15, laser welding gun 2, front ultrasonic vibration head 3, rear ultrasonic vibration head 4, clamp 41, adjusting shaft 42, shielding gas assembly 5, angle adjustment seat 51, fixing rod 52, shielding gas pipe 53, adjusting sleeve 54, locking member 55, clamping member 56, angle adjustment head 57, upsetting head 58, abutment 59, height adjuster 6, drive motor 61, reducer 62, drive screw 63, first support seat 64, guide rod 65, slider 66, second support seat 67, support rod 68, angle adjuster 7, connecting rod 71, adjustment seat 72, rotating clamp 73, first clamping seat 74, second clamping seat 75, locking bolt 76, pressure sensor 8 and other terms, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; any additional limitation construed in them would be contrary to the spirit of the present invention.

Claims

1. A dual ultrasonic adaptive assisted laser welding device, comprising a mounting bracket (1) and a laser welding gun (2) mounted in the middle of the mounting bracket (1); characterized in that: The mounting bracket (1) is provided with a front ultrasonic vibration head (3) and a rear ultrasonic vibration head (4) which move synchronously with the laser welding gun (2), and the front ultrasonic vibration head (3) and the rear ultrasonic vibration head (4) are respectively arranged at the front and rear ends of the welding direction of the laser welding gun (2); the mounting bracket (1) is provided with an adjustment component for adjusting the position of the front ultrasonic vibration head (3) and the rear ultrasonic vibration head (4), and the adjustment component includes a height adjuster (6) and an angle adjuster (7) connected to the end of the height adjuster (6).

2. A dual ultrasonic adaptive assisted laser welding device according to claim 1, characterized in that: The mounting bracket (1) comprises a bracket body (11) and mounting support plates (12) formed at opposite ends of the bracket body (11); the laser welding gun (2) is mounted in the middle of the bracket body (11); the adjustment assembly is mounted at the connection between the mounting support plate (12) and the bracket body (11); and a driving plate (13) for driving the mounting bracket (1) to move as a whole is provided on the back of the bracket body (11).

3. The dual ultrasonic adaptive assisted laser welding device according to claim 2, characterized in that: The height adjuster (6) comprises a first support seat (64) and a second support seat (67) connected to the mounting support plate (12); a slider (66) abutting against the mounting support plate (12) is provided between the first support seat (64) and the second support seat (67); and a driving screw (63) for driving the slider (66) to move up and down is installed on the bracket body (11).

4. The dual ultrasonic adaptive assisted laser welding device according to claim 3, characterized in that: The slider (66) is connected to a support rod (68) that rises and falls synchronously with the slider (66), a guide seat (14) for guiding the support rod (68) to rise and fall is installed at the bottom of the bracket body (11), and a pressure sensor (8) for identifying the vibration amplitude of the ultrasonic vibration head is installed at the bottom of the support rod (68), and an angle adjuster (7) is installed at the bottom of the pressure sensor (8).

5. The dual ultrasonic adaptive assisted laser welding device according to claim 3, characterized in that: A driving motor (61) for controlling a driving screw (63) is mounted on the bracket body (11), and a speed reducer (62) for connecting to the driving screw (63) is provided at the output end of the driving motor (61).

6. The dual ultrasonic adaptive assisted laser welding device according to claim 4, characterized in that: The angle adjuster (7) comprises a connecting rod (71) and an adjustment seat (72) located at the bottom of the connecting rod (71), the connecting rod (71) being connected to the pressure sensor (8), and a rotating clamp (73) for adjusting the angle of the front ultrasonic vibration head (3) or the rear ultrasonic vibration head (4) being installed in the adjustment seat (72).

7. The dual ultrasonic adaptive assisted laser welding device according to claim 6, characterized in that: The end of the front ultrasonic vibration head (3) or the rear ultrasonic vibration head (4) is sleeved with a clamp (41), and an adjustment shaft (42) for controlling the rotation angle of the front ultrasonic vibration head (3) or the rear ultrasonic vibration head (4) is formed on the clamp (41). The rotating clamp (73) is a hollow frame structure, and a first clamping seat (74) and a second clamping seat (75) for clamping the adjustment shaft (42) are formed in the rotating clamp (73). A locking bolt (76) for pressing the first clamping seat (74) and the second clamping seat (75) against the adjustment shaft (42) is installed on the rotating clamp (73). A smooth through hole is formed in the first clamping seat (74), and a threaded hole threadedly connected to the locking bolt (76) is formed in the second clamping seat (75).

8. The dual ultrasonic adaptive assisted laser welding device according to claim 2, characterized in that: A protective gas assembly (5) corresponding to the rear end ultrasonic vibration head (4) is mounted on the mounting support plate (12). The protective gas assembly (5) includes a fixed rod (52) connected to a protective gas pipe (53) at the bottom of the fixed rod (52). A clamping seat for mounting the fixed rod (52) is provided on the mounting support plate (12). An angle adjustment seat (51) for adjusting the angle of the protective gas pipe (53) is provided at the bottom of the fixed rod (52).

9. The dual ultrasonic adaptive assisted laser welding device according to claim 8, characterized in that: The angle adjustment seat (51) includes a clamping member (56) sleeved on the end of the protective air pipe (53) and an adjusting sleeve (54) rotatably connected to the bottom of the fixed rod (52). The clamping member (56) is formed with an angle adjustment head (57) that can rotate along the radial direction of the adjusting sleeve (54). The angle adjustment head (57) is inserted into the adjusting sleeve (54), and an upsetting head (58) is formed at the end of the angle adjustment head (57). An abutting member (59) for locking the rotation angle of the angle adjustment head (57) is installed on the adjusting sleeve (54). The abutting member (59) abuts at the connection between the angle adjustment head (57) and the upsetting head (58). The end of the adjusting sleeve (54) is provided with a locking member (55) for locking the axial angle of the adjusting sleeve (54).

10. A welding method using a dual ultrasonic adaptive assisted laser welding device, based on the dual ultrasonic adaptive assisted laser welding device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step A: Install the mounting bracket (1) on the welding robot, and sequentially install a front ultrasonic vibration head (3), a laser welding gun (2), a rear ultrasonic vibration head (4), and a shielding gas assembly (5) arranged along the welding direction of the welding robot on the mounting bracket (1); Step B: adjusting the angular positions of the front ultrasonic vibration head (3) and the rear ultrasonic vibration head (4) to ensure that the front ultrasonic vibration head (3) and the rear ultrasonic vibration head (4) correspond to the front edge and the rear edge of the molten pool respectively; Step C: Under the control of the control system, the welding robot is controlled to weld along the set welding direction. During the welding process, the control system receives the vibration pressure collected by the pressure sensor (8). The control system adjusts the height of the front ultrasonic vibration head (3) and the rear ultrasonic vibration head (4) by comparing the collected vibration pressure with the set pressure.

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