Ultrasonic assisted welding apparatus and welding method

Abstract

The application relates to the technical field of welding, and discloses an ultrasonic auxiliary welding device and a welding method. The ultrasonic auxiliary welding device can maximize the ultrasonic vibration and act on the molten pool in the shortest distance, avoids ultrasonic vibration attenuation caused by the distance change between the molten pool and the vibration head, and continuously improves the mechanical properties of the weld. The ultrasonic auxiliary welding device comprises a first platform, a welding mechanism, an ultrasonic vibration mechanism and a follow-up mechanism. The first platform is used for placing a sample to be welded. The welding mechanism is arranged above the first platform and comprises a welding gun. The ultrasonic vibration mechanism is arranged below the first platform and comprises at least two vibration heads. The orthographic projections of the at least two vibration heads on the sample are distributed on both sides of the butt joint position of the sample. The follow-up mechanism is arranged below the first platform and drives the vibration heads to move synchronously with the welding gun.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and specifically to an ultrasonic-assisted welding device and welding method. Background Technology

[0002] Laser welding is a highly efficient and precise welding method that uses a laser beam with extremely high energy density as the welding heat source. It has many advantages such as high energy density, fast welding speed, large depth-to-width ratio, small heat-affected zone, and small welding deformation. It is widely used in automobile manufacturing, aerospace, electronics, nuclear power and other fields.

[0003] During laser welding, a weld seam is formed in the material bonding area. If the welding process is not properly controlled, various defects or abnormal structures can form at the weld seam, affecting the performance of the material bonding area. For example, in laser filler wire welding technology containing Al-Si coatings, the Al-Si coating on the surface of hot-formed steel can enter the molten pool during laser welding, causing large-sized blocky ferrite to easily form in the weld seam, which seriously affects the mechanical properties of the welded joint, such as room temperature tensile strength and weld hardness.

[0004] To address this, an ultrasonic-assisted welding process has emerged, utilizing ultrasonic vibration devices to improve the mechanical properties of the weld. However, in existing ultrasonic-assisted welding processes, the ultrasonic vibration devices cannot continuously improve the mechanical properties of the weld and can also cause changes in the weld gap, resulting in poor welding stability. Summary of the Invention

[0005] In view of this, the present invention provides an ultrasonic-assisted welding device and welding method to solve the problems that existing ultrasonic-assisted welding methods cannot continuously improve the mechanical properties of welds and have poor welding stability.

[0006] In a first aspect, the present invention provides an ultrasonic-assisted welding apparatus, comprising:

[0007] The first platform is used to place the templates to be welded;

[0008] A welding mechanism is disposed above the first platform, and the welding mechanism includes a welding torch;

[0009] An ultrasonic vibration mechanism is disposed below the first platform. The ultrasonic vibration mechanism includes at least two vibration heads, and the orthographic projections of the at least two vibration heads on the template are distributed on both sides of the template docking position.

[0010] A follower mechanism is located below the first platform. The follower mechanism is connected to the vibrating head and drives the vibrating head to move synchronously with the welding torch.

[0011] Beneficial effects: The ultrasonic-assisted welding device of the present invention includes a first platform, a welding mechanism, an ultrasonic vibration mechanism, and a follow-up mechanism. The follow-up mechanism drives the vibrating head to move synchronously with the welding torch, maximizing the ultrasonic vibration's effect on the molten pool with the shortest distance. This avoids ultrasonic vibration attenuation caused by changes in the distance between the molten pool and the vibrating head, ensuring the ultrasonic vibration mechanism continuously improves the mechanical properties of the weld and guarantees welding stability. Furthermore, a molten pool forms at the template butt joint during welding. The at least two vibrating heads of the ultrasonic vibration mechanism are positioned on either side of the template butt joint, preventing direct contact between the vibrating heads and the molten pool. This avoids the heat from the welding torch affecting the vibrating heads, preventing damage due to overheating and ensuring the service life of the ultrasonic vibration mechanism.

[0012] In one optional embodiment, the ultrasonic vibration mechanism includes a first vibration head and a second vibration head, wherein the line connecting the first vibration head and the second vibration head projected onto the template is L, and the line L is set at an angle to the template docking position.

[0013] Beneficial effects: In the ultrasonic assisted welding device of the present invention, the first and second vibrating heads of the ultrasonic vibration mechanism form orthographic projections on the template. The line L connecting the orthographic projections of the first and second vibrating heads on the template is set at an angle to the mating position of the template (i.e., the welding direction and weld). This angle can be an acute angle, a right angle, or an obtuse angle, which makes the arrangement of the vibrating heads of the ultrasonic vibration mechanism more flexible, thereby meeting different welding requirements.

[0014] In one optional embodiment, the distance from the orthographic projection of the welding torch onto the template to the connecting line L is D1, and the distance D1 ranges from 0 to 5 mm.

[0015] Beneficial effects: In the ultrasonic assisted welding device of the present invention, the orthographic projection of the welding torch on the template is at a certain distance, D1, from the connecting line L. During the welding process of the welding torch on the two templates, the molten pool has a certain length in the welding direction, which keeps the vibrating head at a certain distance from the welding torch. Moreover, in the welding direction, the vibrating head is located behind the welding torch, which allows the vibrating head to transmit vibration to the molten pool more fully. Then, the cavitation effect generated by the ultrasonic vibration in the melt affects the flow behavior of the fluid, increases the fluidity, and plays a role in breaking up the banded structure, so as to achieve the effect of refining the weld structure.

[0016] In one alternative implementation, the distance between the first vibrating head and the second vibrating head is adjustable.

[0017] Beneficial effects: In the ultrasonic assisted welding device of the present invention, the distance between the first vibrating head and the second vibrating head is not fixed but adjustable, so that the distance between the first vibrating head and the second vibrating head can be changed according to different welding requirements, that is, the distance between the orthographic projection of the first vibrating head and the second vibrating head on the template and the joint position of the template can be changed, thereby adjusting the vibration effect of the two vibrating heads on the molten pool to meet different welding requirements.

[0018] In one optional embodiment, the distance D2 between the first vibrating head and the second vibrating head ranges from 5 to 20 mm.

[0019] Beneficial effects: In the ultrasonic assisted welding device of the present invention, the distance D2 between the first vibrating head and the second vibrating head is within the above-mentioned range. The first vibrating head and the second vibrating head can significantly improve the weld structure and enhance the comprehensive mechanical properties of the weld.

[0020] In one alternative embodiment, the orthographic projections of the first and second vibrating heads on the template are symmetrically arranged relative to the mating position of the template.

[0021] Beneficial effects: In the ultrasonic assisted welding device of the present invention, the first vibrating head and the second vibrating head are symmetrically arranged on the template with their orthogonal projections relative to the template docking position, so that the vibration effect of the first vibrating head and the second vibrating head on the molten pool is the same, which can evenly improve the fluidity of the molten pool, break up the banded structure more uniformly, and make the effect of refining the weld structure better.

[0022] In one optional embodiment, the first platform is provided with a hollowed-out operating hole, the operating hole being arranged along the extension direction of the template docking position, and the vibrating head extending into the operating hole and contacting the template.

[0023] Beneficial effects: The ultrasonic assisted welding device of the present invention allows the vibrating head to directly contact the template through the operating hole, directly applying high-frequency sound waves to the template, further enhancing the refinement effect of the weld structure and significantly improving the comprehensive mechanical properties of the weld.

[0024] In one optional embodiment, the follower mechanism includes a first direction moving component and a second direction moving component. The first direction moving component drives the vibrating head to move synchronously with the welding torch in a first direction, and the second direction moving component drives the vibrating head to move synchronously with the welding torch in a second direction.

[0025] Beneficial effects: The ultrasonic assisted welding device of the present invention includes a follow-up mechanism comprising a first direction moving component and a second direction moving component, which can drive the vibrating head to move synchronously with the welding torch in the first and second directions, realizing the follow-up of the vibrating head in two dimensions. This allows the vibrating head to reliably move synchronously with the welding torch, maximizing the effect of ultrasonic vibration on the molten pool with the shortest distance, avoiding ultrasonic vibration attenuation caused by changes in the distance between the molten pool and the vibrating head, and further ensuring that the ultrasonic vibration mechanism can continuously improve the mechanical properties of the weld and ensure welding stability.

[0026] In one optional embodiment, the first directional movement component includes a first directional movement platform and a first directional movement drive, wherein the first directional movement drive is connected to the first directional movement platform.

[0027] The second directional movement component includes a second directional movement platform and a second directional movement drive, wherein the second directional movement drive is connected to the second directional movement platform;

[0028] One of the first directional moving platform and the second directional moving platform is disposed on the upper surface of the other, and the vibrating head is disposed on the first directional moving platform or the second directional moving platform located above.

[0029] Beneficial effects: The ultrasonic assisted welding device of the present invention has a simple structure for the first direction moving component and the second direction moving component, which is easy to install and set up, and has good structural reliability, is not easily damaged, and has a long service life.

[0030] In one alternative embodiment, a lifting mechanism is further included, the lifting mechanism comprising a second platform and a lifting adjustment component, the ultrasonic vibration mechanism and the follower mechanism being disposed on the second platform, and the lifting adjustment component driving the second platform to rise or fall.

[0031] Beneficial effects: The ultrasonic assisted welding device of the present invention, by setting up a lifting mechanism, can adjust the vertical position of the vibrating head to meet the welding requirements of templates of different thicknesses, making the welding operation more flexible and convenient.

[0032] Secondly, the present invention also provides a welding method performed by the aforementioned ultrasonic-assisted welding device, the welding method comprising:

[0033] Based on the parameters of the two templates, adjust the distance D2 between the first and second vibrating heads, and adjust the distance D1 between the orthographic projection of the welding torch on the template and the line L connecting the orthographic projections of the first and second vibrating heads on the template.

[0034] Set the operating parameters for the welding mechanism, ultrasonic vibration mechanism, and servo mechanism;

[0035] The ultrasonic vibration mechanism and the welding mechanism are started sequentially;

[0036] The first and second vibrating heads move synchronously with the welding torch.

[0037] Since the welding method of the present invention is performed by the ultrasonic-assisted welding device of the present invention, it has the same beneficial effects as the ultrasonic-assisted welding device, which will not be elaborated here.

[0038] In one optional implementation, the step of setting the operating parameters of the welding mechanism, the ultrasonic vibration mechanism, and the follow-up mechanism includes:

[0039] When the two samples have the same thickness and strength, the operating power of the first vibrating head and the second vibrating head is the same;

[0040] When the two samples have different thicknesses or strengths, the operating power of the first vibrating head and the second vibrating head will be different.

[0041] Beneficial effects: The welding method of the present invention allows for independent adjustment of the operating power of the first and second vibrating heads. The operating power of the first and second vibrating heads can be set according to the thickness, strength, etc. of the two samples to be welded, so as to meet the requirements of different plate thicknesses and different strength levels of the coated plates for ultrasonic vibration power. Attached Figure Description

[0042] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0043] Figure 1 This is an overall schematic diagram of the ultrasonic-assisted welding device of the present invention;

[0044] Figure 2 This is a schematic diagram of the spacing adjustment mechanism in the ultrasonic assisted welding device of the present invention;

[0045] Figure 3 This is a side view of a partial structure of the ultrasonic-assisted welding device of the present invention;

[0046] Figure 4 This is a top view of a partial structure of the ultrasonic-assisted welding device of the present invention;

[0047] Figure 5a The weld microstructure diagram is shown for Experimental Data 1 (without using the ultrasonic-assisted welding device of the present invention).

[0048] Figure 5b The weld microstructure diagram for Experiment 1 (spacing D2 is 5mm);

[0049] Figure 5c The weld microstructure diagram for Experimental Data 1 (spacing D2 is 10mm);

[0050] Figure 5d The weld microstructure diagram for Experimental Data 1 (spacing D2 is 15mm);

[0051] Figure 5e The weld microstructure diagram for Experimental Data 1 (spacing D2 is 20mm);

[0052] Figure 5f The weld microstructure diagram for Experimental Data 1 (spacing D2 is 25mm);

[0053] Figure 6a The weld microstructure diagram for Experimental Data 2 (distance D1 is 0);

[0054] Figure 6b The weld microstructure diagram for Experimental Data 2 (distance from D1 is 1mm);

[0055] Figure 6c The weld microstructure diagram for Experimental Data 2 (distance from D1 is 2mm);

[0056] Figure 6d The weld microstructure diagram for Experimental Data 2 (distance from D1 is 5mm);

[0057] Figure 6e The weld microstructure diagram for Experimental Data 2 (distance from D1 is 10mm);

[0058] Figure 6f This is a weld microstructure diagram for Experimental Data 2 (distance from D1 is 20mm).

[0059] Explanation of reference numerals in the attached figures:

[0060] 1. First platform; 101. Operating hole; 2. Template; 3. Welding torch; 4. First vibrating head; 5. Second vibrating head; 6. First direction moving platform; 7. First direction moving drive; 8. Second direction moving platform; 9. Second direction moving drive; 10. Second platform; 11. Molten pool; 12. Amplitude bar; 13. Transducer; 14. Ultrasonic generator; 15. Adjusting nut; 16. Adjusting screw; 17. First direction CNC device; 18. Second direction CNC device; 19. Template clamp; 20. Slide groove; 21. Slider; 22. Adjusting rod; 23. Scale. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0062] There are several ways to set the vibrating head in ultrasonic assisted welding devices on the market. One way is that the vibrating head directly contacts the sample docking position. The heat from the welding gun will be applied to the vibrating head in large quantities, which can easily cause the vibrating head to overheat and be damaged, affecting its service life. Another way is that the vibrating head abuts against the side of the sample away from the sample docking position, which makes the vibrating head too far away from the molten pool, resulting in poor ultrasonic vibration effect.

[0063] Based on this, the present invention provides an ultrasonic-assisted welding device and a welding method.

[0064] The following is combined Figures 1-6f This describes embodiments of the ultrasonic-assisted welding apparatus and welding method of the present invention.

[0065] According to an embodiment of the present invention, an ultrasonic-assisted welding device is provided, comprising: a first platform 1, a welding mechanism, an ultrasonic vibration mechanism, and a follower mechanism. The first platform 1 is used to place two templates 2 to be welded. The welding mechanism is disposed above the first platform 1 and includes a welding torch 3. The ultrasonic vibration mechanism is disposed below the first platform 1 and includes at least two vibration heads. The orthographic projections of the at least two vibration heads on the templates 2 are distributed on both sides of the mating position of the two templates 2. The follower mechanism is disposed below the first platform 1 and is connected to the vibration heads. The follower mechanism drives the vibration heads to move synchronously with the welding torch 3.

[0066] This ultrasonic-assisted welding device, through a follow-up mechanism, drives the vibrating head (ultrasonic head) to move synchronously with the welding torch 3. This maximizes the ultrasonic vibration's effect on the molten pool 11 with the shortest distance, avoiding ultrasonic vibration attenuation caused by changes in the distance between the molten pool 11 and the vibrating head. This ensures that the ultrasonic vibration mechanism continuously improves the mechanical properties of the weld and guarantees welding stability. Furthermore, a molten pool forms at the template butt joint during welding. The at least two vibrating heads of the ultrasonic vibration mechanism are positioned on either side of the template butt joint, preventing direct contact between the vibrating heads and the molten pool 11. This avoids the heat from the welding torch 3 affecting the vibrating heads, preventing damage due to overheating and ensuring the service life of the ultrasonic vibration mechanism.

[0067] The ultrasonic-assisted welding device of this embodiment can weld various materials, including samples with coatings, such as hot-formed steel with Al-Si coatings. During the welding process, the ultrasonic-assisted welding device utilizes ultrasound to improve the weld microstructure. Ultrasound has advantages such as high frequency, cavitation effect, and easy propagation. During welding, the ultrasonic excitation force provided by the ultrasonic excitation device introduces ultrasonic stress waves into the weld pool, causing the molten metal in the pool to undergo ultrasonic forced vibration, resulting in cavitation, acoustic flow, mechanical stirring, and thermal effects. This increases fluidity, ensures a uniform transition in the fusion zone, and improves wettability. For high-strength steel with coatings, the coating enters the weld during welding. The increased fluidity of the molten pool due to ultrasonic vibration breaks down the coating within the weld, distributing it evenly.

[0068] The first platform 1 is used to support and place the templates 2 to be welded. Typically, two templates 2 are placed on the first platform 1 and joined together. The welding mechanism welds the two templates 2 at the joint. A template clamp 19 is provided on the upper surface of the first platform 1. Figure 1 As shown, one end of the template clamp 19 is fixed to the first platform 1, and the other end can press down on the template 2, so that the template 2 is stably placed on the first platform 1, ensuring the smooth progress of the welding process. Figure 1 Taking the perspective as an example, two templates 2 to be welded are set on the first platform 1. A template clamp 19 is set on each of the left and right sides of the upper surface of the first platform 1, and the two template clamps 19 press down on one template 2 respectively.

[0069] A welding mechanism is positioned above the first platform 1. This mechanism is used to weld two templates 2, and a weld seam is formed at the joint of the two templates 2 during the welding process. The welding device includes a welding torch 3, which, for example, uses a laser to weld the two templates 2 together. During this process, a molten pool 11 is formed at the joint of the templates, and the metal in the molten pool 11 cools to form the weld seam. Of course, the welding mechanism in this embodiment also includes other structures and devices common to existing welding mechanisms, which will not be elaborated here.

[0070] The ultrasonic vibration mechanism is used to provide ultrasonic waves and guide ultrasonic stress waves into the weld pool. The ultrasonic vibration mechanism is located below the first platform 1 and includes at least two vibration heads. Depending on different welding requirements, the at least two vibration heads can provide ultrasonic waves simultaneously or partially. Furthermore, the operating power of each vibration head can be adjusted individually; the operating power of each vibration head can be the same or different to meet the ultrasonic vibration power requirements of coated plates with different thicknesses and strength levels.

[0071] Furthermore, the orthographic projections of at least two vibrating heads on template 2 are distributed on both sides of the template mating position, such as... Figure 1As shown, the vibrating head is positioned below the template 2, and the vibrating head is not directly facing the template docking position, but rather maintains a certain distance from the template docking position. This avoids excessive heat during the welding process from affecting the service life of the vibrating head, while ensuring the ultrasonic vibration effect.

[0072] The follower mechanism is located below the first platform 1 and is connected to the vibrating head. The follower mechanism drives the vibrating head to move synchronously with the welding torch 3. Under the action of the follower mechanism, the vibrating head moves synchronously with the welding torch 3, that is, it moves together with the molten pool 11, maximizing the ultrasonic vibration's effect on the molten pool 11 with the shortest distance. This avoids ultrasonic vibration attenuation caused by changes in the distance between the molten pool 11 and the vibrating head, resulting in good welding stability. Ultrasonic vibration generates mechanical vibration through high-frequency sound waves. Utilizing the effect of ultrasonic vibration and the cavitation effect generated in the melt, it can significantly affect the fluid flow behavior, increase fluid fluidity, break up banded structures, and refine the weld structure.

[0073] Furthermore, the ultrasonic vibration mechanism includes a first vibration head 4 and a second vibration head 5. The line connecting the first vibration head 4 and the second vibration head 5 on the template 2 is L, and the line L is set at an angle to the docking position of the template.

[0074] In this embodiment, the ultrasonic vibration mechanism includes two vibration heads, namely a first vibration head 4 and a second vibration head 5. The orthographic projections of the first vibration head 4 and the second vibration head 5 on the template 2 are distributed on both sides of the template mating position. Figure 4 As shown, the orthographic projection of the first vibrating head 4 onto the template 2 is point a, and the orthographic projection of the second vibrating head 5 onto the template 2 is point b. The line connecting the orthographic projections of the first vibrating head 4 and the second vibrating head 5 onto the template 2 is L, that is, the line connecting point a and point b is L. The line L is set at an angle to the mating position of the template. This angle can be acute, right, or obtuse, making the arrangement of the vibrating heads of the ultrasonic vibration mechanism more flexible, thereby meeting different welding requirements.

[0075] In this embodiment, the connection line L is set at a 90° angle to the template.

[0076] The ultrasonic vibration mechanism also includes an ultrasonic generating assembly, and each vibration head is equipped with a set of ultrasonic generating assemblies. The ultrasonic generating assembly includes an amplitude transformer 12, a transducer 13, and an ultrasonic generator 14. Taking the first vibration head 4 as an example, the ultrasonic generator 14 is electrically connected to the transducer 13. The output end of the transducer 13 is connected to one end of the amplitude transformer 12, and the other end of the amplitude transformer 12 is connected to the first vibration head 4. In this embodiment, the transducer 13 and the amplitude transformer 12 are coaxially arranged, and the vibration direction of the amplitude transformer 12 is axial.

[0077] In this embodiment, the transducer is a magnetostrictive transducer or a piezoelectric ceramic transducer, and the amplitude rod 12 is a cylindrical amplitude rod.

[0078] In this embodiment, the output power range of the ultrasonic generator 14 is 0-2000W, and the amplitude range is 5-30μm.

[0079] Furthermore, the distance from the orthographic projection of the welding torch 3 onto the template 2 to the connecting line L is D1, and the range of distance D1 is 0-5mm.

[0080] like Figure 3 and Figure 4 As shown, the orthographic projection of the welding torch 3 on the template 2 is point c, and the distance from point c to the connecting line L is D1. The range of distance D1 is 0-5mm. For example, distance D1 can be 0, 1mm, 1.5mm, 2mm, 3mm, 4mm, 5mm, etc.

[0081] Because the molten pool 11 has a certain length during the welding process of the two templates 2 by the welding torch 3, the vibrating head and the welding torch 3 are kept at a certain distance, and in the welding direction (within the direction of welding). Figure 4 Taking the perspective as an example, the welding direction is from bottom to top. The vibrating head is located behind the welding torch 3, so that the vibrating head can act more fully on the molten pool 11. Then, the cavitation effect generated by the ultrasonic vibration in the melt affects the flow behavior of the fluid, increases the fluidity, and plays a role in breaking up the banded structure, so as to achieve the effect of refining the weld structure.

[0082] Furthermore, the distance between the first vibrating head 4 and the second vibrating head 5 is adjustable.

[0083] In this embodiment, the distance between the first vibrating head 4 and the second vibrating head 5 is not fixed but adjustable. The distance between the first vibrating head 4 and the second vibrating head 5 can be changed according to different welding requirements. That is, the distance between the orthographic projection of the first vibrating head 4 and the second vibrating head 5 on the template 2 and the template docking position can be changed, thereby adjusting the vibration effect of the two vibrating heads on the molten pool 11 to meet different welding requirements.

[0084] When adjusting the distance between the first vibrating head 4 and the second vibrating head 5, it can be set to adjust only the position of the first vibrating head 4, or only the position of the second vibrating head 5, or both the positions of the first vibrating head 4 and the second vibrating head 5 simultaneously, to change the distance between the first vibrating head 4 and the second vibrating head 5. Before and after adjustment, the distance from the orthographic projection point a of the first vibrating head 4 to the template docking position and the distance from the orthographic projection point b of the second vibrating head 5 to the template docking position can be the same or different.

[0085] Furthermore, the distance D2 between the first vibrating head 4 and the second vibrating head 5 ranges from 5 to 20 mm. Within this range, the ultrasonic waves provided by the first vibrating head 4 and the second vibrating head 5 can significantly improve the weld microstructure and enhance the overall mechanical properties of the weld. The distance between the first vibrating head 4 and the second vibrating head 5 can be adjusted according to different welding requirements; for example, the distance D2 between the first vibrating head 4 and the second vibrating head 5 can be 5 mm, 7 mm, 10 mm, 12 mm, 15 mm, 18 mm, 20 mm, etc.

[0086] Furthermore, the orthographic projections of the first vibrating head 4 and the second vibrating head 5 on the template 2 are symmetrically arranged relative to the template docking position.

[0087] In this embodiment, the orthographic projections of the first vibrating head 4 and the second vibrating head 5 on the template 2 are symmetrically arranged relative to the welding template docking position. That is, the distance from the orthographic projection point a of the first vibrating head 4 on the template 2 to the template docking position and the distance from the orthographic projection point b of the second vibrating head 5 on the template 2 to the template docking position are the same. This makes the vibration effect of the first vibrating head 4 and the second vibrating head 5 on the molten pool 11 the same, which can evenly improve the fluidity of the molten pool 11, more uniformly break up the banded structure, and make the effect of refining the weld structure better.

[0088] Furthermore, the first platform 1 is provided with a hollowed-out operating hole 101, which is set along the extension direction of the template docking position. The vibrating head extends into the operating hole 101 and contacts the template 2.

[0089] To facilitate contact between the vibrating head and the template 2 and improve the ultrasonic vibration effect, a hollow operating hole 101 is provided on the first platform 1. The operating hole 101 can be a U-shaped hole. The operating hole 101 is set along the extension direction of the template docking position. The length of the operating hole 101 should be greater than the length of the template docking position of the two templates 2, and the width of the operating hole 101 should also be greater than the width of the template docking position of the two templates 2, so as to facilitate welding operations.

[0090] like Figure 1 As shown, the first vibrating head 4 and the second vibrating head 5 are located below the first platform 1. The first vibrating head 4 and the second vibrating head 5 extend upward into the operating hole 101 and then contact the template 2, thereby applying ultrasonic vibration to the molten pool 11. It can be understood that after the first vibrating head 4 extends into the operating hole 101, it contacts one of the templates 2, and after the second vibrating head 5 extends into the operating hole 101, it contacts the other template 2.

[0091] Furthermore, the follow-up mechanism includes a first direction moving component and a second direction moving component. The first direction moving component drives the vibrating head to move synchronously with the welding torch 3 in the first direction, and the second direction moving component drives the vibrating head to move synchronously with the welding torch 3 in the second direction.

[0092] The follower mechanism can drive the first vibrating head 4 and the second vibrating head 5 to move synchronously with the welding torch 3 in the first and second directions, realizing the follower of the first vibrating head 4 and the second vibrating head 5 in two dimensions, so that the first vibrating head 4 and the second vibrating head 5 can reliably move synchronously with the welding torch 3.

[0093] like Figures 1-3 As shown, in this embodiment, the first direction is the direction indicated by arrow x, which is the x-axis direction, and the second direction is the direction indicated by arrow y, which is the y-axis direction. The first direction and the second direction are perpendicular.

[0094] Furthermore, the first directional moving component includes a first directional moving platform 6 and a first directional moving drive 7, the first directional moving drive 7 being connected to the first directional moving platform 6; the second directional moving component includes a second directional moving platform 8 and a second directional moving drive 9, the second directional moving drive 9 being connected to the second directional moving platform 8; one of the first directional moving platform 6 and the second directional moving platform 8 is disposed on the upper surface of the other, and the vibrating head is disposed on the first directional moving platform 6 or the second directional moving platform 8 located above.

[0095] like Figure 1 As shown, the first direction moving component includes a first direction moving platform 6 and a first direction moving drive 7. The first direction moving platform 6 is arranged parallel to the first platform 1, and the first direction moving drive 7 is connected to the first direction moving platform 6. Under the drive of the first direction moving drive 7, the first direction moving platform 6 can move in the first direction.

[0096] Specifically, the first direction moving component also includes a first direction CNC device 17, which is electrically connected to the first direction moving drive 7. The first direction moving drive 7 is connected to the first direction moving platform 6 through a first lead screw assembly.

[0097] The first lead screw assembly includes a first lead screw and a first nut, with the length direction of the first lead screw aligned with the first direction. A first-direction movement drive 7 is connected to the first lead screw, and a first-direction movement platform 6 is connected to the first nut, which is fitted onto the first lead screw. A first-direction CNC device 17 controls the operation of the first-direction movement drive 7, which drives the first lead screw to rotate. The first lead screw then moves the first nut along the first lead screw in the first direction, thereby moving the first-direction movement platform 6 in the first direction.

[0098] The parameters of the first-direction CNC device 17 are set according to the welding path, etc., which can control the operation of the first-direction moving drive 7, so that the first-direction moving platform 6 can achieve the displacement amount and displacement speed that match the welding torch 3 during the welding process, ensuring that the action position of the vibrating head always follows the movement of the molten pool 11, and ensuring that the action position of the vibrating head always maintains a fixed distance from the molten pool 11.

[0099] The second-direction moving component includes a second-direction moving platform 8 and a second-direction moving drive 9. The second-direction moving platform 8 is arranged parallel to the first platform 1 and the first-direction moving platform 6. The second-direction moving drive 9 is connected to the second-direction moving platform 8. Under the drive of the second-direction moving drive 9, the second-direction moving platform 8 can move in the second direction.

[0100] Specifically, the second direction movement component also includes a second direction CNC device 18, which is electrically connected to the second direction movement drive 9. The second direction movement drive 9 is connected to the second direction movement platform 8 through the second lead screw assembly.

[0101] The second lead screw assembly includes a second lead screw and a second nut, with the length direction of the second lead screw aligned with the second direction. A second-direction movement drive 9 is connected to the second lead screw, and a second-direction movement platform 8 is connected to the second nut, which is fitted onto the second lead screw. A second-direction CNC device 18 controls the operation of the second-direction movement drive 9, which rotates the second lead screw. The second lead screw then moves the second nut along the second lead screw in the second direction, thereby moving the second-direction movement platform 8 in the second direction.

[0102] The parameters of the second-direction CNC device 18 are set according to the welding path, etc., which can control the operation of the second-direction moving drive 9, so that the second-direction moving platform 8 can achieve the displacement amount and displacement speed that match the welding torch 3 during the welding process, ensuring that the action position of the vibrating head always follows the movement of the molten pool 11, and ensuring that the action position of the vibrating head always maintains a fixed distance from the molten pool 11.

[0103] Specifically, both the first-direction moving drive 7 and the second-direction moving drive 9 are motors.

[0104] One of the first directional moving platform 6 and the second directional moving platform 8 is disposed on the upper surface of the other, and the vibrating head is disposed on the first directional moving platform 6 or the second directional moving platform 8 located above. That is, the first directional moving platform 6 can be disposed on the upper surface of the second directional moving platform 8, in which case the vibrating head is disposed on the first directional moving platform 6; or, the second directional moving platform 8 can be disposed on the upper surface of the first directional moving platform 6, in which case the vibrating head is disposed on the second directional moving platform 8.

[0105] In this embodiment, the second-direction moving platform 8 is disposed on the upper surface of the first-direction moving platform 6, and the first vibrating head 4 and the second vibrating head 5 are both disposed on the second-direction moving platform 8. When the first-direction moving platform 6 moves along the first direction, it simultaneously drives the second-direction moving platform 8, the first vibrating head 4, and the second vibrating head 5 to move together along the first direction. When the second-direction moving platform 8 moves along the second direction, it drives the first vibrating head 4 and the second vibrating head 5 to move along the second direction.

[0106] Understandably, the movement of the first vibration head 4 and the second vibration head 5 in the first direction driven by the first direction moving component is a displacement component, and the movement of the first vibration head 4 and the second vibration head 5 in the second direction driven by the second direction moving component is another displacement component. The displacement of the first vibration head 4 and the second vibration head 5 is the resultant displacement of these two displacement components.

[0107] Furthermore, it also includes a lifting mechanism, which includes a second platform 10 and a lifting adjustment component. An ultrasonic vibration mechanism and a follow-up mechanism are disposed on the second platform 10, and the lifting adjustment component drives the second platform 10 to rise or fall.

[0108] like Figure 1 As shown, the lifting structure includes a second platform 10 and a lifting and adjusting assembly. The second platform 10 is located below the first platform 1 and is parallel to the first platform 1. The first direction moving platform 6 and the second direction moving platform 8 are located on the second platform 10.

[0109] The lifting and adjusting assembly is located on the side of the first platform 1 and the second platform 10. The assembly includes an adjusting screw 16 and an adjusting nut 15. The adjusting screw 16 passes through the side of the first platform 1 and the second platform 10, and the adjusting nut 15 is threadedly connected to the adjusting screw 16. Taking one side of the first platform 1 as an example, the first platform 1 is sandwiched between the two adjusting nuts 15. As the two adjusting nuts 15 move along the adjusting screw 16, the lifting and lowering of the first platform 1 is achieved. Similarly, the second platform 10 can also be lifted and lowered under the action of the adjusting nut 15, making the distance between the first platform 1 and the second platform 10 adjustable.

[0110] The ultrasonic-assisted welding device in this embodiment also includes a spacing adjustment mechanism, through which the spacing between the first vibrating head 4 and the second vibrating head 5 is adjusted.

[0111] like Figure 2As shown, the spacing adjustment mechanism includes a slide groove 20, a slider 21, an adjusting rod 22, and a scale 23. The slide groove 20 is disposed on the second-direction moving platform 8, and the extension direction of the slide groove 20 is set at an angle to the template docking position. In this embodiment, the extension direction of the slide groove 20 is perpendicular to the template docking position. The slider 21 can slide along the slide groove 20. There are two sliders 21. The transducer 13 of the first vibration head 4 is disposed on one slider 21, and the transducer 13 of the second vibration head 5 is disposed on the other slider 21. To make the structure stable, the bottom of the transducer 13 can be fixed to the slider 21. One end of the adjusting rod 22 is placed outside the second-direction moving platform 8 for easy operation. Inside the second-direction moving platform 8, the adjusting rod 22 is fitted with a sliding nut. The sliding nut connects one end of two universal joints, and the other end of the universal joints are respectively connected to the two sliders 21. The two universal joints and the adjusting rod 22 are arranged in a Y-shape. When the adjusting rod 22 is rotated, the sliding nut moves along the adjusting rod 22, causing the universal joint to swing. The universal joint simultaneously causes the two sliders 21 to slide along the slide groove 20. The two sliders 21 can move closer to each other or further away, thereby adjusting the distance between the first vibrating head 4 and the second vibrating head 5.

[0112] A scale 23 is set on one side of the slide groove 20 to facilitate observation of the change in the distance between the first vibrating head 4 and the second vibrating head 5 during the adjustment of the distance. In this embodiment, the two sliders 21 can move a distance of 0-25mm, corresponding to a distance of 5-30mm between the two vibrating heads.

[0113] In this embodiment, during the welding process of the ultrasonic-assisted welding device, the ultrasonic vibration mechanism introduces ultrasonic frequency stress waves into the weld pool 11. Under the action of the follower mechanism, the ultrasonic vibration mechanism moves along with the weld pool 11, maximizing the ultrasonic vibration effect on the weld pool 11 and avoiding ultrasonic vibration attenuation caused by changes in the distance between the weld pool 11 and the vibrating head. The ultrasonic vibration, through the mechanical vibration generated by high-frequency sound waves, can significantly affect the flow behavior of the fluid, increase its fluidity, break up banded structures, and refine the weld structure.

[0114] This embodiment also provides a welding method performed by the aforementioned ultrasonic-assisted welding device, the welding method comprising:

[0115] Step S01: According to the parameters of the two templates 2, adjust the distance D2 between the first vibration head 4 and the second vibration head 5, and adjust the distance D1 between the orthographic projection of the welding gun 3 on the template 2 and the line L connecting the orthographic projections of the first vibration head 4 and the second vibration head 5 on the template 2.

[0116] Step S02: Set the operating parameters of the welding mechanism, ultrasonic vibration mechanism, and follow-up mechanism;

[0117] Step S03: Start the ultrasonic vibration mechanism and the welding mechanism in sequence;

[0118] In step S04, the first vibrating head 4 and the second vibrating head 5 move synchronously with the welding torch 3.

[0119] In step S01, based on the materials and properties of the two templates 2 to be welded, the templates 2 have different parameters (including thickness, strength, etc.). The distance D2 between the first vibration head 4 and the second vibration head 5 is adjusted according to the parameters of the two templates 2, and the distance D1 between the orthographic projection of the welding gun 3 on the template 2 and the line L connecting the orthographic projections of the first vibration head 4 and the second vibration head 5 on the template 2 is adjusted.

[0120] In step S01, based on the parameters of the two templates 2, the operating parameters of the welding mechanism are set, including laser power, welding rate, wire feed speed, etc.; and the operating parameters of the ultrasonic vibration mechanism are set, including the output power and amplitude of the ultrasonic generator 14. Based on the welding path, the operating parameters of the first-direction CNC device 17 and the second-direction CNC device 18 in the follow-up mechanism are set. This ensures that the vibrating head in the ultrasonic vibration mechanism moves synchronously with the weld pool 11, and that the center line of the laser beam emitted by the welding torch 3 maintains a certain distance from the plane of the ultrasonic vibrating head near the weld pool 11.

[0121] During the welding process, the ultrasonic vibration mechanism provides the driving force for ultrasonic vibration, applying high-frequency ultrasonic vibration to the template 2 to be welded. The high-frequency electrical oscillation generated by the ultrasonic generator 14 is converted into mechanical vibration with a certain amplitude through the transducer 13 and the amplitude transformer 12. Then, the ultrasonic frequency stress wave is introduced into the weld pool 11 through the first vibration head 4 and the second vibration head 5. Under the action of the follower mechanism, the ultrasonic vibration mechanism moves with the weld pool 11, maximizing the ultrasonic vibration to act on the weld pool 11 with the shortest distance, avoiding ultrasonic vibration attenuation caused by changes in the distance between the weld pool 11 and the vibration head. The mechanical vibration generated by the high-frequency sound waves can significantly affect the flow behavior of the fluid, increase the fluidity, break up the banded structure, and refine the weld structure.

[0122] Furthermore, the steps for setting the operating parameters of the welding mechanism, the ultrasonic vibration mechanism, and the follow-up mechanism include: when the thicknesses of the two templates 2 are the same, the operating power of the first vibration head 4 and the second vibration head 5 is the same; when the thicknesses of the two templates 2 are different, the operating power of the first vibration head 4 and the second vibration head 5 is different.

[0123] In step S01, the operating power of the first vibrating head 4 and the second vibrating head 5 can be adjusted independently. That is, the ultrasonic generator 14 connected to the first vibrating head 4 and the second vibrating head 5 can be adjusted independently. The operating power of the first vibrating head 4 and the second vibrating head 5 can be adjusted according to the thickness and strength of different samples 2 to achieve the best ultrasonic vibration effect and meet the ultrasonic vibration power requirements of samples 2 (such as coated plates) with different thicknesses and strength levels.

[0124] The following describes a welding experiment using the ultrasonic-assisted welding device of this embodiment.

[0125] Experimental Data 1

[0126]

[0127] like Figures 5b-5f As shown, the coated plate was welded using an ultrasonic-assisted welding device. Sample 2 (high-strength steel) is hot-formed steel B1500HS with Al-Si coating and has a thickness of 1.5mm.

[0128] Adjust the distance D2 between the first vibrating head 4 and the second vibrating head 5 to 5mm. Figure 5b ), 10mm Figure 5c ), 15mm Figure 5d ), 20mm Figure 5e ) and 25mm ( Figure 5f (Comparative example).

[0129] Adjust the distance D1 from the orthographic projection point c of the welding torch 3 on the template 2 to the connecting line L to be 2mm.

[0130] The basic parameters of the ultrasonic generator are: AC power supply (voltage 220V, frequency 50Hz), ultrasonic generator output power 500W, frequency 20KHz, amplitude 15μm.

[0131] The laser welding parameters are: laser power 4500W, welding rate 80mm / s, and wire feed speed 3.5m / s.

[0132] Based on the set welding path, the parameters of the first direction CNC device 17 and the second direction CNC device 18 are set so that the vibrating head in the ultrasonic vibration mechanism moves synchronously with the weld pool 11.

[0133] Start the ultrasonic vibration mechanism and welding power source sequentially to perform welding. After welding is completed, turn off the welding power source and ultrasonic vibration mechanism sequentially to complete the welding process.

[0134] Depend on Figures 5b-5fThe observation results of the weld microstructure show that when the ultrasonic head spacing D2 is 5-20 mm, the ultrasonic vibration can break up the strip structure in the weld. When the spacing D2 exceeds 20 mm, there is no obvious breaking effect on the strip structure in the weld. Figure 5a The image shows the weld microstructure without the use of an ultrasonic-assisted welding device, revealing a distinct banded structure within the weld.

[0135] Experimental Data 2

[0136]

[0137] like Figures 6a-6f As shown, the coated plate was welded using an ultrasonic-assisted welding device. Sample 2 (high-strength steel) is hot-formed steel B1500HS with Al-Si coating and has a thickness of 1.5mm.

[0138] Adjust the distance D2 between the first vibrating head 4 and the second vibrating head 5 to 10mm.

[0139] Adjust the distance D1 from the orthographic projection point c of the welding torch 3 on the template 2 to the connecting line L to be 0mm. Figure 6a ), 1mm Figure 6b ), 2mm Figure 6c ), 5mm Figure 6d ), 10mm Figure 6e (Comparative) and 20mm ( Figure 6f (Comparative example).

[0140] The basic parameters of the ultrasonic generator are: AC power supply (voltage 220V, frequency 50Hz), ultrasonic generator output power 500W, frequency 20KHz, amplitude 15μm.

[0141] The laser welding parameters are: laser power 4500W, welding rate 80mm / s, and wire feed speed 3.5m / s.

[0142] Based on the set welding path, the parameters of the first direction CNC device 17 and the second direction CNC device 18 are set so that the vibrating head in the ultrasonic vibration mechanism moves synchronously with the weld pool 11.

[0143] Start the ultrasonic vibration mechanism and welding power source sequentially to perform welding. After welding is completed, turn off the welding power source and ultrasonic vibration mechanism sequentially to complete the welding process.

[0144] Depend on Figures 6a-6f The observation results of the weld structure show that when the distance D1 from the orthographic projection point c of the welding torch 3 on the template 2 to the connecting line L is controlled within 0-5mm, the ultrasonic vibration acting on the weld can break the strip structure. When the distance D1 exceeds 5mm, there is obvious strip structure in the weld.

[0145] Experimental Data 3

[0146]

[0147] The coated plates were welded using an ultrasonic-assisted welding device. Sample 2 (high-strength steel) was hot-formed steel B1500HS with Al-Si coating. The thicknesses of the two samples 2 were 1.2 mm and 1.8 mm, respectively.

[0148] Adjust the distance D2 between the first vibrating head 4 and the second vibrating head 5 to 10mm.

[0149] Adjust the distance D1 from the orthographic projection point c of the welding torch 3 on the template 2 to the connecting line L to be 2mm.

[0150] The basic parameters of the ultrasonic generator are as follows: AC power supply (voltage 220V, frequency 50Hz). The ultrasonic generator with 1.2mm thick sample contact has an output power of 300W, a frequency of 20KHz, and an amplitude of 15μm; the ultrasonic generator with 1.8mm thick sample contact has an output power of 800W, a frequency of 20KHz, and an amplitude of 15μm.

[0151] The laser welding parameters are: laser power 4000W, welding rate 80mm / s, and wire feed speed 3.0m / s.

[0152] Based on the set welding path, the parameters of the first direction CNC device 17 and the second direction CNC device 18 are set so that the vibrating head in the ultrasonic vibration mechanism moves synchronously with the weld pool 11.

[0153] Start the ultrasonic vibration mechanism and welding power source sequentially to perform welding. After welding is completed, turn off the welding power source and ultrasonic vibration mechanism sequentially to complete the welding process.

[0154] The results showed that the strip structure in the weld of coated plates of different thicknesses was successfully broken.

[0155] Experimental Data 4

[0156]

[0157]

[0158] The coated plates were welded using an ultrasonic-assisted welding device. Sample 2 (high-strength steel) was hot-formed steel B1500HS with Al-Si coating. The strengths of the two samples 2 were 600MPa and 1500MPa, respectively. The thickness of the two samples 2 was 1.5mm.

[0159] Adjust the distance D2 between the first vibrating head 4 and the second vibrating head 5 to 10mm.

[0160] Adjust the distance D1 from the orthographic projection point c of the welding torch 3 on the template 2 to the connecting line L to be 2mm.

[0161] The basic parameters of the ultrasonic generator are as follows: AC power supply (voltage 220V, frequency 50Hz). The ultrasonic generator used on the 600MPa sample has an output power of 350W, a frequency of 20KHz, and an amplitude of 15μm; the ultrasonic generator used on the 1500MPa sample has an output power of 500W, a frequency of 20KHz, and an amplitude of 15μm.

[0162] The laser welding parameters are: laser power 4500W, welding rate 80mm / s, and wire feed speed 3.5m / s.

[0163] Based on the set welding path, the parameters of the first direction CNC device 17 and the second direction CNC device 18 are set so that the vibrating head in the ultrasonic vibration mechanism moves synchronously with the weld pool 11.

[0164] Start the ultrasonic vibration mechanism and welding power source sequentially to perform welding. After welding is completed, turn off the welding power source and ultrasonic vibration mechanism sequentially to complete the welding process.

[0165] The results showed that the strip structure in the weld of coated plates of different strengths and the same thickness was successfully broken.

[0166] In other embodiments, the ultrasonic vibration mechanism may also include three, four, five, six, or other vibration heads, as long as the orthographic projections of the multiple vibration heads on the template 2 are distributed on both sides of the template docking position. The number of vibration heads on both sides of the template docking position can be the same or different. Furthermore, the orthographic projections of the multiple vibration heads on the template 2 on both sides of the template docking position can be arranged in rows, columns, or a matrix.

[0167] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An ultrasonic-assisted welding device, characterized in that, include: The first platform (1) is used to place the template (2) to be welded; A welding mechanism is disposed above the first platform (1), and the welding mechanism includes a welding torch (3); An ultrasonic vibration mechanism is provided below the first platform (1). The ultrasonic vibration mechanism includes at least two vibration heads, and the orthographic projections of the at least two vibration heads on the template (2) are distributed on both sides of the template docking position. A follower mechanism is located below the first platform (1). The follower mechanism is connected to the vibration head, and the follower mechanism drives the vibration head to move synchronously with the welding torch (3).

2. The ultrasonic-assisted welding device according to claim 1, characterized in that, The ultrasonic vibration mechanism includes a first vibration head (4) and a second vibration head (5). The line connecting the first vibration head (4) and the second vibration head (5) projected onto the template (2) is L, and the line L is set at an angle to the docking position of the template.

3. The ultrasonic-assisted welding device according to claim 2, characterized in that, The distance from the orthographic projection of the welding torch (3) onto the template (2) to the connecting line L is D1, and the range of distance D1 is 0-5mm.

4. The ultrasonic-assisted welding device according to claim 2, characterized in that, The distance between the first vibrating head (4) and the second vibrating head (5) is adjustable.

5. The ultrasonic-assisted welding device according to claim 4, characterized in that, The distance D2 between the first vibrating head (4) and the second vibrating head (5) is in the range of 5-20mm.

6. The ultrasonic-assisted welding device according to claim 2, characterized in that, The first vibrating head (4) and the second vibrating head (5) are symmetrically positioned relative to the docking position of the template (2) on the orthographic projection of the template (4).

7. The ultrasonic-assisted welding apparatus according to claim 1, characterized in that, The first platform (1) is provided with a hollowed-out operation hole (101). The operation hole (101) is provided along the extension direction of the template docking position. The vibrating head extends into the operation hole (101) and contacts the template (2).

8. The ultrasonic-assisted welding device according to claim 1, characterized in that, The follow-up mechanism includes a first direction moving component and a second direction moving component. The first direction moving component drives the vibrating head to move synchronously with the welding torch (3) in a first direction, and the second direction moving component drives the vibrating head to move synchronously with the welding torch (3) in a second direction.

9. The ultrasonic-assisted welding apparatus according to claim 8, characterized in that, The first directional movement component includes a first directional movement platform (6) and a first directional movement drive (7), wherein the first directional movement drive (7) is connected to the first directional movement platform (6); The second directional movement component includes a second directional movement platform (8) and a second directional movement drive (9), and the second directional movement drive (9) is connected to the second directional movement platform (8); One of the first directional moving platform (6) and the second directional moving platform (8) is disposed on the upper surface of the other, and the vibrating head is disposed on the first directional moving platform (6) or the second directional moving platform (8) located above.

10. The ultrasonic-assisted welding apparatus according to any one of claims 1-9, characterized in that, It also includes a lifting mechanism, which includes a second platform (10) and a lifting adjustment component. The ultrasonic vibration mechanism and the follow-up mechanism are disposed on the second platform (10). The lifting adjustment component drives the second platform (10) to rise or fall.

11. A welding method, characterized in that, Performed by the ultrasonic-assisted welding apparatus according to any one of claims 2-10, the welding method comprises: According to the parameters of the two templates (2), adjust the distance D2 between the first vibration head (4) and the second vibration head (5), and adjust the distance D1 between the orthographic projection of the welding gun (3) on the template (2) and the line L connecting the orthographic projections of the first vibration head (4) and the second vibration head (5) on the template (2). Set the operating parameters for the welding mechanism, ultrasonic vibration mechanism, and servo mechanism; The ultrasonic vibration mechanism and the welding mechanism are started sequentially; The first vibrating head (4) and the second vibrating head (5) move synchronously with the welding torch (3).

12. The welding method according to claim 11, characterized in that, The steps for setting the operating parameters of the welding mechanism, ultrasonic vibration mechanism, and follow-up mechanism include: When the thickness and strength of the two templates (2) are the same, the operating power of the first vibrating head (4) and the second vibrating head (5) are the same; When the two samples (2) have different thicknesses or different strengths, the operating power of the first vibrating head (4) and the second vibrating head (5) is different.

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