Welding method and welding apparatus

Abstract

The application discloses a welding method, comprising the following steps: combining a first laser beam and a second laser beam into a third laser beam; and swinging the third laser beam according to a set track to weld a workpiece; wherein the set track comprises a first track and a second track connected to each other, the second track and the first track are arranged along a welding direction, the first track and the second track are both circular, and the diameter of the first track is smaller than that of the second track. The welding method can achieve a better welding effect.

Description

Technical Field

[0001] This invention relates to the field of component welding technology, and in particular to a welding method and welding equipment. Background Technology

[0002] Among related technologies, laser welding has the advantages of minimal deformation of the welded workpiece, aesthetically pleasing and high-quality welds, easy beam control, and easy automation integration. Laser welding can be used to weld automotive shock absorbers or other components. However, during welding, defects such as undercut, burn-through, and large-particle spatter may occur, leading to poor weld quality and ultimately, a lower overall workpiece quality. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a welding method that can achieve better welding results.

[0004] The present invention also proposes a welding device.

[0005] A welding method according to a first aspect of the present invention includes the following steps:

[0006] The first and second laser beams are combined into a third laser beam.

[0007] The third laser beam is oscillated along a set trajectory to weld the workpiece;

[0008] The set trajectory includes a first trajectory and a second trajectory that are connected to each other. The second trajectory and the first trajectory are arranged along the welding direction. Both the first trajectory and the second trajectory are circular, and the diameter of the first trajectory is smaller than the diameter of the second trajectory.

[0009] The welding method according to embodiments of the present invention has at least the following beneficial effects: When welding a workpiece, a first laser beam and a second laser beam are combined into a third laser beam, and then the third laser beam is oscillated along a set trajectory to weld the workpiece. The set trajectory includes a first trajectory and a second trajectory that are interconnected, both of which are circular. The diameter of the first trajectory is smaller than the diameter of the second trajectory. Specifically, when the third laser beam welds along the set trajectory, because the diameter at the first trajectory is smaller than the diameter at the second trajectory, the energy of the third laser beam can be more concentrated at the first trajectory, thereby forming a keyhole. Furthermore, the diameter of the second trajectory is larger, therefore, the third laser beam can widen the molten pool at the second trajectory. Thus, by oscillating the third laser beam along the set trajectory, the molten pool is widened and stirred, which helps to reduce welding defects in the workpiece and refine the weld grains. In particular, the welding method achieves better welding results when welding workpieces.

[0010] According to some embodiments of the present invention, the welding method further includes the following steps: along the welding direction, feeding a first welding wire to one end of the first trajectory away from the second trajectory, and feeding a second welding wire to the side end of the second trajectory.

[0011] According to some embodiments of the welding method of the present invention, the wire feeding speed of the first welding wire and the second welding wire is Vf, the welding speed is Vw, the weld cross-sectional area is Sg, and the total cross-sectional area of ​​the first welding wire and the second welding wire is Sf, satisfying: Vf=(Vw×Sg) / Sf.

[0012] According to some embodiments of the welding method of the present invention, the wire feeding speed of the first welding wire and the second welding wire is Vf, the welding speed is Vw, and 6≤Vw / Vf≤12; the power of the first laser beam is P1, the power of the second laser beam is P2, and 2100w≤P1=P2≤2500w.

[0013] According to some embodiments of the welding method of the present invention, the spot of the first laser beam is concentric with the spot of the second laser beam, and the diameter of the spot of the first laser beam is larger than the diameter of the spot of the second laser beam.

[0014] A welding apparatus according to a second aspect of the present invention includes:

[0015] The first laser is used to emit the first laser beam;

[0016] A second laser is used to emit a second laser beam;

[0017] A beam combining module is used to combine the first laser beam and the second laser beam into a third laser beam.

[0018] A swing module is used to make the third laser beam swing along a set trajectory.

[0019] The set trajectory includes a first trajectory and a second trajectory that are connected to each other. The second trajectory and the first trajectory are arranged along the welding direction. Both the first trajectory and the second trajectory are circular, and the diameter of the first trajectory is smaller than the diameter of the second trajectory.

[0020] The welding equipment according to embodiments of the present invention has at least the following beneficial effects: When welding a workpiece, the beam combining module combines the first laser beam and the second laser beam into a third laser beam, and then the oscillating module oscillates the third laser beam along a set trajectory to weld the workpiece. The set trajectory includes a first trajectory and a second trajectory that are interconnected, both of which are circular. The diameter of the first trajectory is smaller than the diameter of the second trajectory. Specifically, when the third laser beam welds along the set trajectory, because the diameter at the first trajectory is smaller than the diameter at the second trajectory, the energy of the third laser beam can be more concentrated at the first trajectory, thereby forming a keyhole. Furthermore, the diameter of the second trajectory is larger, therefore, the third laser beam can widen the molten pool at the second trajectory. Thus, by oscillating the third laser beam along the set trajectory, the molten pool is widened and stirred, which helps to reduce welding defects in the workpiece and refine the weld grains. In particular, the welding equipment achieves better welding results when welding workpieces.

[0021] According to some embodiments of the welding apparatus of the present invention, the welding apparatus further includes a wire feeding structure for conveying welding wire.

[0022] According to some embodiments of the welding equipment of the present invention, the wire feeding mechanism feeds the welding wire at a speed of Vf, the welding speed is Vw, the weld cross-sectional area is Sg, and the total cross-sectional area of ​​the welding wire is Sf, satisfying: Vf=(Vw×Sg) / Sf.

[0023] According to some embodiments of the welding apparatus of the present invention, three wire feeding mechanisms are provided, namely a first wire feeding mechanism, a second wire feeding mechanism and a third wire feeding mechanism, wherein, along the welding direction, the first wire feeding mechanism feeds a first welding wire to one end of the first trajectory away from the second trajectory, the second wire feeding mechanism feeds a second welding wire to one side of the second trajectory, and the third wire feeding mechanism feeds a third welding wire to the other side of the second trajectory.

[0024] According to some embodiments of the welding apparatus of the present invention, the wire feeding speed of the wire feeding mechanism is Vf, the welding speed is Vw, and 6 ≤ Vw / Vf ≤ 12; the power of the first laser beam is P1, the power of the second laser beam is P2, and 2100w ≤ P1 = P2 ≤ 2500w.

[0025] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0027] Figure 1 A flowchart of a welding method according to some embodiments of the present invention;

[0028] Figure 2 This is a schematic diagram of a welding device according to some embodiments of the present invention;

[0029] Figure 3 This is a schematic diagram of the trajectory setting in the welding method of the first embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the trajectory setting in the welding method of the second embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the wire feeding mechanism feeding welding wire in a welding device according to some embodiments of the present invention.

[0032] Figure label:

[0033] First track 100, second track 200, welding equipment 300, beam combining module 310, beam combining mirror 311, swing module 320, first galvanometer 321, second galvanometer 322, focusing mirror 323, wire feeding mechanism 330, first wire feeding mechanism 331, second wire feeding mechanism 332, third wire feeding mechanism 333, protective gas device 340. Detailed Implementation

[0034] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0035] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0036] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0037] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0038] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] Please refer to Figure 1 In some embodiments, the welding method includes the following steps:

[0040] S100, Combine the first laser beam and the second laser beam into a third laser beam;

[0041] S200, The third laser beam is oscillated according to a set trajectory to weld the workpiece; wherein, the set trajectory includes a first trajectory 100 and a second trajectory 200 that are connected to each other, the second trajectory 200 and the first trajectory 100 are arranged along the welding direction, the first trajectory 100 and the second trajectory 200 are both circular, and the diameter of the first trajectory 100 is smaller than the diameter of the second trajectory 200.

[0042] Specifically, when welding a workpiece, the first and second laser beams are combined into a third laser beam. This third laser beam is then oscillated along a predetermined trajectory to weld the workpiece. The predetermined trajectory includes interconnected first and second trajectories 100 and 200, both of which are circular. The diameter of the first trajectory 100 is smaller than the diameter of the second trajectory 200. Specifically, when the third laser beam welds along the predetermined trajectory, because the diameter at the first trajectory 100 is smaller than that at the second trajectory 200, the energy of the third laser beam can be more concentrated at the first trajectory 100, thus forming a keyhole. Furthermore, the diameter of the second trajectory 200 is larger, therefore, the third laser beam can widen the molten pool at the second trajectory 200. Thus, by oscillating the third laser beam along the predetermined trajectory, the molten pool is widened and stirred, which helps reduce welding defects and refine the weld grains. In summary, this welding method achieves good welding results.

[0043] The following section provides further explanation of how to set the trajectory. Please refer to... Figure 3 and Figure 4 In this application, the trajectory is set to resemble an "∞" trajectory. However, since the diameter of the second trajectory 200 is larger than the diameter of the first trajectory 100, the trajectory set in this application is not entirely identical to the "∞" trajectory. Furthermore, both the aforementioned first trajectory 100 and second trajectory 200 are circular, but this circle is not strictly a circle; it could also be an ellipse. For details, please refer to... Figure 4 In the case where the first trajectory 100 and the second trajectory 200 are elliptical, the major axis of the second trajectory 200 is larger than the major axis of the first trajectory 100. Furthermore, the welding direction is unidirectional.

[0044] Furthermore, the primary function of the third laser beam during welding is to transfer heat to the workpiece, melting it and forming a molten pool. During welding, the welding wire can be fed along a pre-defined trajectory. The welding wire plays multiple roles in welding, including filling gaps, conducting current, protecting the weld, and improving the welding effect. For details, please refer to... Figure 5In some embodiments, the welding method further includes the following steps: along the welding direction, a first welding wire is fed to one end of the first track 100 opposite to the second track 200, and a second welding wire is fed to the side end of the second track 200. Specifically, after the first welding wire is fed to the first track 100, a third laser beam melts the first welding wire, and the molten first welding wire is continuously injected into the molten pool along the edge of the molten pool. This method minimizes the impact on the molten pool and the keyhole, thereby effectively avoiding spatter. Similarly, feeding the second welding wire to the side end of the second track 200 can also achieve continuous injection of the second welding wire into the molten pool along the edge of the molten pool after melting. Since spatter is effectively avoided when the first and second welding wires are injected into the molten pool, this can improve the stability of the welding process, thereby further improving the weld quality and increasing the weld width. It should be added that there can be two second welding wires, and the two second welding wires can be fed to the two sides of the second track 200 respectively.

[0045] Furthermore, the welding method of this application can weld a wider weld on the workpiece to meet the welding requirements of the workpiece. It is conceivable that a stronger weld joint can give the workpiece better airtightness and tensile fracture resistance. To ensure a good welding effect when the weld is large, the wire feeding speed can be controlled. The wire feeding speeds of the first and second welding wires are described below. If the wire feeding speed is too slow, it will cause discontinuous welding and poor welding effect. If the wire feeding speed is too fast, uneven melting of the first or second welding wire will occur, which will also lead to poor welding effect. To effectively avoid this problem, in this embodiment, the wire feeding speeds of the first and second welding wires can be obtained according to the following formula, which can effectively improve the welding effect. Specifically, in some embodiments, the wire feeding speeds of the first and second welding wires are both Vf, the welding speed is Vw, the weld cross-sectional area is Sg, and the total cross-sectional area of ​​the first and second welding wires is Sf, satisfying: Vf=(Vw×Sg) / Sf. The cross-sectional area of ​​the weld is generally a fixed value, but workers can specify the exact value based on processing requirements. For example, in the welding of shock absorbers, the required weld cross-sectional area is 6mm². 2 The total cross-sectional area of ​​the first and second welding wires is 2.8 mm. 2 If the welding speed is 30 mm / s, then the wire feeding speed is 64 mm / s.

[0046] Furthermore, as mentioned above, to ensure a better welding effect when the weld seam is large, the wire feed speed can be controlled. Specifically, the wire feed speed can be determined in addition to the above embodiments, or by other embodiments. For example, it can be determined by the ratio of the wire feed speed to the welding speed. In some embodiments, the wire feed speed of the first and second welding wires is Vf, the welding speed is Vw, 6≤Vw / Vf≤12; the power of the first laser beam is P1, the power of the second laser beam is P2, 2100w≤P1=P2≤2500w. The specific wire feed speed, welding speed, power of the first laser beam, and power of the second laser beam can be referred to in the table below.

[0047]

[0048]

[0049] In the table above, the required weld width is 6.09 mm, meaning the weld width must be greater than or equal to 6.09 mm. "Not measured" specifically indicates poor welding quality, making it impossible to measure the weld width. Specifically, the table shows that when Vw / Vf < 6 and P1 = P2 < 2100w, although the weld quality is good, the weld width does not meet the requirement; when Vw / Vf > 12 and P1 = P2 > 2500w, although the weld width meets the requirement, poor welding results, poor workpiece appearance, and poor workpiece performance may occur.

[0050] Furthermore, the first and second laser beams are described below. Specifically, in some embodiments, the spot size of the first laser beam is concentric with that of the second laser beam, and the diameter of the first laser beam's spot size is larger than that of the second laser beam's spot size. Combining the first and second laser beams allows for a more concentrated energy density in the resulting third laser beam, thus generating higher heat. By making the spot size of the first and second laser beams concentric and ensuring that the diameter of the first laser beam's spot size is larger than that of the second laser beam's spot size, the smaller spot size of the second laser beam increases the melting depth, while the larger spot size of the first laser beam increases the melting width, thereby widening the molten pool.

[0051] Please refer to Figure 2In some embodiments, the welding equipment 300 includes: a first laser (not shown), a second laser (not shown), a beam combining module 310, and a swing module 320. The first laser is used to emit a first laser beam. The second laser is used to emit a second laser beam. The structure of the first laser emitting the first laser beam is prior art and will not be described in detail here. The beam combining module 310 is used to combine the first laser beam and the second laser beam into a third laser beam. The beam combining module 310 can combine the first laser beam and the second laser beam into a third laser beam using a beam combining mirror 311. The swing module 320 is used to swing the third laser beam along a set trajectory. The swing module 320 includes a first galvanometer mirror 321, a second galvanometer mirror 322, and a focusing mirror 323. The set trajectory includes a first trajectory 100 and a second trajectory 200 connected to each other. The second trajectory 200 and the first trajectory 100 are arranged along the welding direction. Both the first trajectory 100 and the second trajectory 200 are circular, and the diameter of the first trajectory 100 is smaller than the diameter of the second trajectory 200.

[0052] Specifically, during welding of the workpiece, the beam combining module 310 combines the first and second laser beams into a third laser beam. Then, the oscillating module 320 oscillates the third laser beam along a set trajectory for welding the workpiece. The set trajectory includes a first trajectory 100 and a second trajectory 200 that are interconnected. Both the first trajectory 100 and the second trajectory 200 are circular, with the diameter of the first trajectory 100 being smaller than the diameter of the second trajectory 200. Specifically, when the third laser beam welds along the set trajectory, because the diameter at the first trajectory 100 is smaller than the diameter at the second trajectory 200, the energy of the third laser beam can be more concentrated at the first trajectory 100, thus forming a keyhole. Furthermore, the second trajectory 200 has a larger diameter, therefore, the third laser beam can widen the molten pool at the second trajectory 200. Thus, by oscillating the third laser beam along the set trajectory, the molten pool is widened and stirred, which helps reduce welding defects in the workpiece and refine the weld grains. In summary, the welding equipment 300 achieves good welding results when welding the workpiece.

[0053] The following section provides further explanation of how to set the trajectory. Please refer to... Figure 3 and Figure 4 In this application, the trajectory is set to resemble an "∞" trajectory. However, since the diameter of the second trajectory 200 is larger than the diameter of the first trajectory 100, the trajectory set in this application is not entirely identical to the "∞" trajectory. Furthermore, both the aforementioned first trajectory 100 and second trajectory 200 are circular, but this circle is not strictly a circle; it could also be an ellipse. For details, please refer to... Figure 4In the case where the first trajectory 100 and the second trajectory 200 are elliptical, the major axis of the second trajectory 200 is larger than the major axis of the first trajectory 100. The diameters of the first trajectory 100 and the second trajectory 200 can range from 0.8 mm to 3 mm. During welding, real-time data of the weld seam can be detected by sensors, thereby adjusting the spot sizes of the first and second laser beams. For example, when the detected weld seam width is small, the spot size can be increased, thus increasing the weld seam width.

[0054] Furthermore, the laser equipment also includes a shielding gas device 340, which is used to spray shielding gas onto the weld. The shielding gas can be argon, and its spray rate is 5–20 L / min. When the shielding gas device 340 sprays the shielding gas, the blowing angle can be 55°–60°.

[0055] Furthermore, the primary function of the third laser beam during welding is to conduct heat to the workpiece, melting it and forming a molten pool. During welding, the welding wire can be fed to a predetermined trajectory for welding. The welding wire plays multiple roles in welding, including filling, conducting current, protecting the weld, and improving the welding effect. Specifically, in some embodiments, the welding equipment 300 also includes a wire feeding structure, with a wire feeding mechanism 330 used to feed the welding wire. It should be added that when the wire feeding mechanism 330 feeds the welding wire, the third laser beam can be tilted, allowing it to easily melt the welding wire.

[0056] Furthermore, the welding method of this application can weld a wider weld on the workpiece to meet the welding requirements of the workpiece. It is conceivable that a stronger weld joint can give the workpiece better airtightness and tensile fracture resistance. To ensure a better welding effect when the weld is large, the wire feeding speed can be controlled. The wire feeding speeds of the first and second welding wires are described below. If the wire feeding speed is too slow, it will cause discontinuous welding and poor welding effect. If the wire feeding speed is too fast, the first or second welding wire will not melt evenly, which will also lead to poor welding effect. To effectively avoid this problem, in this embodiment, the wire feeding speeds of the first and second welding wires can be obtained according to the following formula, which can effectively improve the welding effect. In some embodiments, the wire feeding mechanism 330 feeds the welding wire at a speed of Vf, the welding speed is Vw, the weld cross-sectional area is Sg, and the total cross-sectional area of ​​the welding wire is Sf, satisfying: Vf=(Vw×Sg) / Sf. The cross-sectional area of ​​the weld is generally a fixed value, but workers can specify the exact value based on processing requirements. For example, in the welding of shock absorbers, the required weld cross-sectional area is 6mm². 2 The total cross-sectional area of ​​the first and second welding wires is 2.8 mm.2 If the welding speed is 30 mm / s, then the wire feed speed is 64 mm / s.

[0057] Further, please refer to Figure 5 In some embodiments, three wire feeding mechanisms 330 are provided: a first wire feeding mechanism 331, a second wire feeding mechanism 332, and a third wire feeding mechanism 333. Along the welding direction, the first wire feeding mechanism 331 feeds the first welding wire to one end of the first track 100 opposite to the second track 200; the second wire feeding mechanism 332 feeds the second welding wire to one side of the second track 200; and the third wire feeding mechanism 333 feeds the third welding wire to the other side of the second track 200. Specifically, after the first wire feeding mechanism 331 delivers the first welding wire to the first track 100, the third laser beam melts the first welding wire, and the molten first welding wire is continuously injected into the molten pool along the edge of the molten pool. This method minimizes the impact on the molten pool and the keyhole, effectively preventing spatter. Similarly, the second wire feeding mechanism 332 can also deliver the second welding wire to the side end of the second track 200, thereby achieving continuous injection of the melted second welding wire into the molten pool along the edge of the molten pool. The third wire feeding mechanism 333 feeds the second welding wire to the side end of the second trajectory 200, which also enables the second welding wire to be continuously injected into the molten pool along the edge of the molten pool after melting. Since the first, second, and third welding wires are injected into the molten pool, spatter is effectively avoided, which can improve the stability of the welding process, thereby further improving the weld quality and increasing the weld width.

[0058] Furthermore, to ensure a better welding effect when the weld seam is large, this can be achieved by controlling the wire feeding speed. Besides the above-described embodiments, the wire feeding speed can also be determined through other embodiments, such as the ratio of the wire feeding speed to the welding speed. In some embodiments, the wire feeding speed of the wire feeding mechanism 330 is Vf, the welding speed is Vw, and 6 ≤ Vw / Vf ≤ 12; the power of the first laser beam is P1, and the power of the second laser beam is P2, where 2100w ≤ P1 = P2 ≤ 2500w. The specific values ​​of the wire feeding speed, welding speed, power of the first laser beam, and power of the second laser beam can be found in the table below.

[0059]

[0060]

[0061] In the table above, the required weld width is 6.09 mm, meaning the weld width must be greater than or equal to 6.09 mm. "Not measured" specifically indicates poor welding quality, making it impossible to measure the weld width. Specifically, the table shows that when Vw / Vf < 6 and P1 = P2 < 2100w, although the weld quality is good, the weld width does not meet the requirement; when Vw / Vf > 12 and P1 = P2 > 2500w, although the weld width meets the requirement, poor welding results, poor workpiece appearance, and poor workpiece performance may occur.

[0062] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A welding method, characterized in that, Includes the following steps: The first and second laser beams are combined into a third laser beam. The third laser beam is oscillated along a set trajectory to weld the workpiece; The set trajectory includes a first trajectory and a second trajectory that are connected to each other. The second trajectory and the first trajectory are arranged along the welding direction. Both the first trajectory and the second trajectory are circular, and the diameter of the first trajectory is smaller than the diameter of the second trajectory. The welding method further includes the following steps: along the welding direction, feeding a first welding wire to one end of the first trajectory away from the second trajectory, and feeding a second welding wire to the side end of the second trajectory.

2. The welding method according to claim 1, characterized in that, The wire feeding speed of the first welding wire and the second welding wire is Vf, the welding speed is Vw, the weld cross-sectional area is Sg, and the total cross-sectional area of ​​the first welding wire and the second welding wire is Sf, satisfying: Vf=(Vw×Sg) / Sf.

3. The welding method according to claim 1, characterized in that, The spot of the first laser beam is concentric with the spot of the second laser beam, and the diameter of the spot of the first laser beam is larger than the diameter of the spot of the second laser beam.

4. Welding equipment, characterized in that, include: The first laser is used to emit the first laser beam; A second laser is used to emit a second laser beam; A beam combining module is used to combine the first laser beam and the second laser beam into a third laser beam. A swing module is used to make the third laser beam swing along a set trajectory. The set trajectory includes a first trajectory and a second trajectory that are connected to each other. The second trajectory and the first trajectory are arranged along the welding direction. Both the first trajectory and the second trajectory are circular, and the diameter of the first trajectory is smaller than the diameter of the second trajectory. The welding equipment also includes a wire feeding mechanism for conveying welding wire. Along the welding direction, the wire feeding mechanism feeds a first welding wire to one end of the first track away from the second track and feeds a second welding wire to the side end of the second track.

5. The welding equipment according to claim 4, characterized in that, The wire feeding mechanism feeds the welding wire at a speed of Vf, the welding speed is Vw, the weld cross-sectional area is Sg, and the total cross-sectional area of ​​the welding wire is Sf, satisfying: Vf=(Vw×Sg) / Sf.

6. The welding equipment according to claim 4, characterized in that, The wire feeding mechanism is provided in three parts, namely a first wire feeding mechanism, a second wire feeding mechanism and a third wire feeding mechanism. Along the welding direction, the first wire feeding mechanism feeds the first welding wire to one end of the first track away from the second track, the second wire feeding mechanism feeds the second welding wire to one side of the second track, and the third wire feeding mechanism feeds the third welding wire to the other side of the second track.

Images