Swing arm, welding system and method

Abstract

The present application relates to the technical field of swing arm manufacturing, and in particular to a swing arm, a welding system and a method. The swing arm comprises an arm assembly and a tube assembly. The arm assembly comprises two side plates. The two side plates are sequentially and spacedly arranged along the axial direction of the tube assembly. The outer circumferential surface of the tube assembly is welded with one end of each of the two side plates to form a weld assembly. The distance between the first end of the side plate along the circumferential direction of the tube assembly and the adjacent end of the tube assembly in the axial direction of the tube assembly is less than the distance between the second end of the side plate along the circumferential direction of the tube assembly and the adjacent end of the tube assembly in the axial direction of the tube assembly. The outer weld is arranged on the side away from each other of the two side plates. The outer weld is spaced from the first end of the side plate. The inner weld is arranged on the side close to each other of the two side plates. The minimum distance between the outer weld and the adjacent end of the tube assembly along the axial direction of the tube assembly is greater than 0. Thus, the problem that it is difficult to balance the strength and yield after welding the swing arm is solved.

Description

Technical Field

[0001] This invention relates to the field of swing arm manufacturing technology, and more specifically, to a swing arm, a welding system, and a method. Background Technology

[0002] The vehicle's suspension control arm connects to the vehicle body at one end and to the steering knuckle at the other, responsible for guiding, supporting, and damping vibrations. The control arm consists of the arm body and the sleeve. Because the arm body and the sleeve are suitable for different manufacturing processes, they are usually manufactured separately and then welded together as one piece.

[0003] The part connecting the arm body and the sleeve includes two side plates, which are spaced apart along the axial direction of the sleeve. When the distance between the side plate and one end of the sleeve along the axial direction is small, the heat during the welding process can easily cause deformation or even local melting and penetration of the end face of the sleeve, resulting in a low welding yield. When the distance between the side plate and one end of the sleeve along the axial direction is large, the spacing between the two side plates will be small. When one end of the sleeve is subjected to a force along the direction from the sleeve to the side plate, the small spacing between the two side plates will result in a shorter resistance arm, and the connection between the arm body and the sleeve will be easily damaged or even broken. Summary of the Invention

[0004] To address the challenge of balancing strength and yield after welding a swing arm, this invention provides a swing arm, a welding system, and a method.

[0005] In a first aspect, the present invention provides a swing arm, the swing arm comprising:

[0006] The arm assembly includes two side plates;

[0007] A pipe assembly, wherein two side plates are sequentially spaced apart along the axial direction of the pipe assembly; the outer circumferential surface of the pipe assembly is welded to one end of each of the two side plates to form a weld bead assembly; the distance A between the first end of the side plate along the circumference of the pipe assembly and its adjacent end on the pipe assembly is in the axial direction of the pipe assembly; the distance B between the second end of the side plate along the circumference of the pipe assembly and its adjacent end on the pipe assembly is in the axial direction of the pipe assembly; A < B;

[0008] The weld assembly includes an outer weld and an inner weld; the outer weld is disposed on the mutually distant side of the two side plates; the outer weld is spaced apart from the first end of the side plate; the inner weld is disposed on the mutually close side of the two side plates; M > 0; where M is the minimum distance between the outer weld and one end of the adjacent pipe assembly along the axial direction of the pipe assembly.

[0009] Optionally, the projection area of ​​the outer weld bead along the thickness direction of the side plate partially overlaps with the projection area of ​​the adjacent inner weld bead along the thickness direction of the side plate.

[0010] Optionally, A > Z × K; where Z is the dimension of the outer weld bead along the axial direction of the pipe assembly; K ≥ 1.

[0011] Optionally, the distance between the side plate and the adjacent end of the tube assembly in the axial direction of the tube assembly gradually increases along the direction from the first end to the second end.

[0012] Optionally, the outer weld bead includes a first weld bead and a second weld bead; the first weld bead and the second weld bead are arranged sequentially along the direction from the second end to the first end;

[0013] The difference between the connection strength of the first weld bead and the pipe assembly and the connection strength of the first weld bead and the side plate is within a set strength range.

[0014] Optionally, the connection strength between the second weld and the pipe assembly is less than the connection strength between the second weld and the side plate.

[0015] Optionally, the distance between the adjacent sides of the two side plates along the axial direction of the tube assembly decreases from the first end to the second end; the inner weld bead is spaced apart from the second end of the side plate.

[0016] Optionally, the arm assembly further includes a middle plate; the middle plate is fixedly connected to one end of the two side plates along the circumferential direction of the tube assembly; the middle plate is connected to the tube assembly.

[0017] In a second aspect, the present invention provides a swing arm welding system, the swing arm welding system comprising any of the swing arms described in the first aspect, and the swing arm welding system further comprising:

[0018] Fixture components, welding components;

[0019] The welding state of the welding system includes the fixture assembly being detachably connected to the side plate and the pipe assembly respectively, and the welding assembly welding the junction of the side plate and the pipe assembly to form the weld bead assembly.

[0020] Thirdly, the present invention provides a swing arm welding method, wherein the swing arm welding method is applied to the swing arm welding system described in the second aspect, the swing arm welding method comprising:

[0021] The two side plates and the pipe assembly are positioned respectively; wherein, the positioning is completed by the two side plates being spaced apart along the axial direction of the pipe assembly, the pipe assembly being disposed at one end of the two side plates, the distance between the side plates and the pipe assembly being within a first predetermined range, the distance between the first end of the side plate along the circumference of the pipe assembly and its adjacent end on the pipe assembly being A in the axial direction of the pipe assembly; the distance between the second end of the side plate along the circumference of the pipe assembly and its adjacent end on the pipe assembly being B in the axial direction of the pipe assembly; A < B;

[0022] A welding assembly welds an outer weld bead at the junction of one of the side plates away from the other side plate and the pipe assembly; wherein the outer weld bead is located on the mutually distant sides of the two side plates; the outer weld bead is spaced apart from the first end of the side plate; M > 0; wherein M is the minimum distance between the outer weld bead and one end of the adjacent pipe assembly along the axial direction of the pipe assembly;

[0023] The welding assembly welds an inner weld bead at the junction of one of the side plates near the other side plate and the pipe assembly.

[0024] Optionally, the welding assembly forms an outer weld bead at the junction of one of the side plates away from the other side plate and the pipe assembly, comprising:

[0025] The welding wire of the welding assembly welds the first weld bead to the side plate and the pipe assembly from the second end toward the first end along the welding reference line; wherein, the welding reference line is the boundary line between the side plate away from the other side plate and the pipe assembly, and the offset of the welding wire from the welding reference line during the welding process is within a second set range.

[0026] Based on the formation of the first weld bead, the welding wire moves in a first set state to form a second weld bead; wherein, the first weld bead is located on the side of the second weld bead near the second end; the first set state includes the welding wire rotating about a set axis, and the set axis moving in the direction from the second end to the first end.

[0027] Based on the formation of the rear weld bead, the welding wire moves in a second set state to form a second weld bead; wherein, the front weld bead, the rear weld bead, and the second weld bead are arranged in sequence; the second set state includes the welding wire rotating around a set axis, the set axis moving along the direction from the second end to the first end, and at least a portion of the movement trajectory of the set axis being offset on the side of the welding reference line near the side plate.

[0028] To address the challenge of balancing strength and yield after welding the swing arm, this invention offers the following advantages:

[0029] By incorporating a gradually varying spacing structure in the welding structure between the arm assembly and the tube assembly of the swing arm, where the spacing between the first and second ends of the side plates along the circumference of the tube assembly corresponds to the axial spacing of the tube assembly, A < B, the outer weld bead of the weld assembly is positioned on the mutually distant sides of the two side plates and spaced apart from the first end of the side plates. The inner weld bead is positioned on the mutually close sides of the two side plates, and the minimum distance M > 0 between the outer weld bead and one end of the adjacent tube assembly along the axial spacing of the tube assembly is limited. This structure can form a longer resistance arm to resist external forces when the tube assembly is subjected to forces along the direction from the tube assembly to the side plate. Simultaneously, it effectively blocks the influence of welding heat on the end of the tube assembly, preventing deformation and burn-through at the end of the tube assembly. This structure effectively improves the welded connection strength between the side plates and the tube assembly, optimizes the load-bearing performance at the swing arm connection, and solves the technical problems of low yield rate and easy damage and breakage of the welded connection under stress in traditional swing arm welding. It effectively balances the welding accuracy and yield rate of the swing arm with the stability of the overall connection structure, improving the overall reliability of the swing arm. Attached Figure Description

[0030] Figure 1 A schematic diagram of a swing arm welding system according to one embodiment is shown;

[0031] Figure 2 A schematic diagram of a swing arm and welding torch unit according to one embodiment is shown;

[0032] Figure 3 It shows Figure 2 A magnified view of a portion of the image;

[0033] Figure 4 A schematic diagram of a swing arm according to one embodiment is shown;

[0034] Figure 5 It shows Figure 4 A magnified view of a portion of the image;

[0035] Figure 6 A schematic diagram of a swing arm welding method according to one embodiment is shown;

[0036] Reference numerals: 10 Arm assembly; 11 Arm unit; 111 Arm body; 112 First connecting part; 113 Second connecting part; 12 Middle plate; 13 Side plate; 20 Pipe assembly; 30 Clamp assembly; 31 Support part; 32 Clamping part; 40 Welding assembly; 41 Moving unit; 42 Welding gun unit; 421 Gun head; 422 Welding wire; 50 Weld bead assembly; 51 Outer weld bead; 511 First weld bead; 5111 Front weld bead; 5112 Rear weld bead; 512 Second weld bead; 52 Inner weld bead. Detailed Implementation

[0037] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0038] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0039] The existing swing arm assembly 10 includes two side plates 13, which are spaced apart along the axial direction of the tube assembly 20. The outer circumferential surface of the tube assembly 20 is welded to one end of the two side plates 13 to form a weld assembly 50. In traditional welded structure design, it is difficult to reasonably match the axial distance between the side plates 13 and the adjacent ends of the tube assembly 20, resulting in obvious technical defects. If the distance between the side plates 13 and the adjacent ends of the tube assembly 20 along the axial direction is small, the heat generated during the welding process will directly act on the end of the tube assembly 20, easily causing deformation of the end of the tube assembly 20, or even local melting and penetration, significantly reducing the welding yield of the swing arm. If the axial distance between the side plates 13 and the adjacent ends of the tube assembly 20 is increased, the effective distance between the two side plates 13 will be reduced, shortening the structural resistance arm. When the tube assembly 20 is subjected to a force along the direction from the tube assembly 20 to the side plates 13, the shorter resistance arm cannot effectively bear the external force, causing damage or even breakage at the welded connection between the arm assembly 10 and the tube assembly 20.

[0040] Example 1:

[0041] This embodiment discloses a swing arm, such as Figure 2 , Figure 3 As shown, the swing arm includes: arm assembly 10 and tube assembly 20;

[0042] Arm assembly 10 includes two side plates 13;

[0043] Two side plates 13 are sequentially spaced along the axial direction of the pipe assembly 20; the outer circumferential surface of the pipe assembly 20 is welded to one end of each of the two side plates 13 to form a weld bead assembly 50; the distance between the first end of the side plate 13 along the circumference of the pipe assembly 20 and its adjacent axial end on the pipe assembly 20 is A; the distance between the second end of the side plate 13 along the circumference of the pipe assembly 20 and its adjacent axial end on the pipe assembly 20 is B; A < B; Figure 5 As shown, the first end can be the right end of the side plate 13, and the second end can be the left end of the side plate 13. After the side plate 13 and the pipe assembly 20 are welded together to form a swing arm, if the pipe assembly 20 is subjected to a force along the direction from the pipe assembly 20 to the side plate 13, the large distance between the two first ends along the axial direction of the pipe assembly 20 can form a long resistance arm to resist the force, thereby ensuring that the connection strength between the side plate 13 and the pipe assembly 20 is sufficient.

[0044] The weld assembly 50 includes an outer weld 51 and an inner weld 52. The outer weld 51 is located on the opposite sides of the two side plates 13. Since the distance between the first end and the axial end of the pipe assembly 20 is small, the outer weld 51 is spaced apart from the first end of the side plate 13. This can prevent the heat from welding from causing deformation or even melting through the pipe assembly 20 near the first end, thereby improving the yield of the swing arm welding. The inner weld 52 is located on the opposite sides of the two side plates 13. M > 0. Wherein, M is the minimum distance between the outer weld 51 and the adjacent end of the pipe assembly 20 along the axial direction of the pipe assembly 20. This can prevent the heat from welding the outer weld 51 from causing large deformation at the axial end of the pipe assembly 20 and avoid melting through the axial end of the pipe assembly 20. The spacing control between the side plate 13 and the pipe assembly 20 allows the weld assembly 50 near the first end to provide higher connection strength, while the weld assembly 50 near the second end can provide a certain connection strength while avoiding damage to the sleeve, thus balancing the connection strength between the side plate 13 and the pipe assembly 20 and ensuring a high yield rate of welding.

[0045] Furthermore, the arm assembly 10 also includes an arm unit 11; the arm unit 11 includes an arm body 111, a first connecting part 112, and a second connecting part 113; one end of the arm body 111 is connected to the end of the middle plate 12 away from the tube assembly 20, the other end is connected to the first connecting part 112, and the other end is connected to the second connecting part 113; the inner peripheral wall of the tube assembly 20, the first connecting part 112, and the second connecting part 113 can be connected to corresponding external components respectively.

[0046] Furthermore, such as Figure 3 As shown, the outer weld bead 51 is along the thickness direction of the edge plate 13 (i.e., as shown in the figure). Figure 3 The projection area (shown in the left-right direction) partially overlaps with the projection area of ​​the adjacent inner weld bead 52 along the thickness direction of the side plate 13; the end of the side plate 13 away from the tube assembly 20 is subjected to any direction along the axial direction of the tube assembly 20 (e.g., Figure 3 Forces applied in either the left-to-right or right-to-left direction (as shown) can result in high connection strength.

[0047] Furthermore, such as Figure 4 , Figure 5 As shown, A > Z × K; where Z is the dimension of the outer weld bead 51 along the axial direction of the pipe assembly 20; K ≥ 1; K can be a safety factor, which can ensure the connection strength between the pipe assembly 20 and the side plate 13 while preventing excessive deformation and melt-through at one end of the axial direction of the pipe assembly 20 during the welding process; preferably K ≥ 1.2, thereby further optimizing the above effect.

[0048] Furthermore, such as Figure 3 , Figure 5As shown, the distance between the adjacent ends of the side plate 13 and the pipe assembly 20 in the axial direction of the pipe assembly 20 gradually increases from the first end to the second end. The gradual increase in distance can rely on the gradually increasing support span to gradually improve the structure's resistance to overturning and bending, effectively disperse the concentrated stress in the connection area between the pipe assembly 20 and the side plate 13, and avoid the problem of local overload tearing.

[0049] Furthermore, such as Figure 5 As shown, the outer weld bead 51 includes a first weld bead 511 and a second weld bead 512; the first weld bead 511 and the second weld bead 512 are arranged sequentially along the direction from the second end to the first end;

[0050] The difference between the connection strength of the first weld 511 and the pipe assembly 20 and the connection strength of the first weld 511 and the side plate 13 is within the set strength range. The connection strength can be controlled by the position of the welding assembly 40 against the pipe assembly 20 and the side plate 13. For example, the welding assembly 40 abuts against the junction of the side plate 13 and the pipe assembly 20. This can make the two connection strengths as consistent as possible, and finally stably connect the side plate 13 and the pipe assembly 20 into one unit to improve the service life of the swing arm.

[0051] Furthermore, the connection strength between the second weld bead 512 and the pipe assembly 20 is less than the connection strength between the second weld bead 512 and the side plate 13; when welding the pipe assembly 20 and the corresponding position of the second weld bead 512 on the side plate 13, the area of ​​the welding component 40 abutting the pipe assembly 20 can be smaller than the area of ​​the welding component 40 abutting the side plate 13; in the axial direction of the pipe assembly 20, the distance between the second weld bead 512 and the adjacent axial end of the pipe assembly 20 is small, which can prevent the axial end of the pipe assembly 20 from being subjected to large heat. This method can take into account both welding strength and prevent excessive deformation and melting of the pipe assembly 20.

[0052] Furthermore, the connection strength between the second weld 512 and the pipe assembly 20 is less than the connection strength between the second weld 512 and the side plate 13, and the absolute value of the difference between the two connection strengths can be greater than the set strength range, thereby further optimizing the above-mentioned effect.

[0053] Furthermore, such as Figure 2 , Figure 3 As shown, the distance between the adjacent sides of the two side plates 13 along the axial direction of the pipe assembly 20 can be reduced from the first end to the second end. This allows the inner weld 52 to be as close as possible to one axial end of the adjacent pipe assembly 20, thus improving the connection strength, given a certain thickness of the side plate 13. Welding is performed on the adjacent sides of the two side plates 13. Since the welding position is constrained by the materials of the side plates 13 and the pipe assembly 20, it is not easy for the weld to burn through. The distance between the second ends of the two side plates 13 is small. The welding assembly 40 has a certain volume and cannot be welded to the second end. Therefore, the inner weld 52 is spaced apart from the second end of the side plate 13.

[0054] Furthermore, the distance between the two adjacent sides of the two side plates 13 along the axial direction of the pipe assembly 20 can be gradually reduced from the first end to the second end, which can prevent the sudden change in the distance between the two adjacent sides of the two side plates 13 along the axial direction of the pipe assembly 20 from causing stress concentration when the swing arm is subjected to force after welding.

[0055] Furthermore, such as Figure 3 As shown, the arm assembly 10 also includes a middle plate 12; the middle plate 12 is fixedly connected to one end of the two side plates 13 along the circumference of the tube assembly 20, which can improve the strength of the swing arm after welding; the middle plate 12 is connected to the tube assembly 20, and the connection method can be snap-fit ​​connection, glue connection, or welding; the preferred connection method is welding, which can reduce the equipment used in swing arm production and reduce costs; when welding the middle plate 12 to the tube assembly 20, the welding wire rotates around a set axis, and the junction of the side of the middle plate 12 away from the side plate 13 and the tube assembly 20 coincides with the set axis, that is, the welding method is spiral oscillating welding. When the welding wire 422 touches the tube assembly 20, the welding current is 220A and the welding voltage is 23V. When the welding wire 422 touches the side plate 13, the welding current is 230A and the welding voltage is 23V. The welding speed is 9mm / s, the oscillation amplitude of the welding wire is 2mm, and the frequency is 4Hz.

[0056] Example 2:

[0057] This embodiment provides a swing arm welding system, which includes any of the swing arms described in the above embodiments, such as... Figure 1 As shown, the swing arm welding system may also include:

[0058] Fixture assembly 30, welding assembly 40;

[0059] The welding state of the welding system includes the fixture assembly 30 being detachably connected to the side plate 13 and the pipe assembly 20 respectively, and the welding assembly 40 welding the junction of the side plate 13 and the pipe assembly 20 to form a weld bead assembly 50; the fixture assembly 30 can fix the relative position of the side plate 13 and the pipe assembly 20 to prevent the relative displacement of the side plate 13 and the pipe assembly 20 during the welding process from causing welding failure.

[0060] Furthermore, such as Figure 1 As shown, the clamping assembly 30 may include a support part 31, a clamping part 32, and a flipping part; the support part 31 is used to support the side plate 13 and the pipe assembly 20; the clamping part 32 can cooperate with the support part 31 to clamp the side plate 13 and the two sides of the pipe assembly 20 respectively; the flipping part can be connected to the support part 31 and the clamping part 32 respectively, so as to change the posture of the swing arm when the support part 31 and the clamping part 32 clamp the swing arm according to actual needs.

[0061] Example 3:

[0062] This embodiment provides a swing arm welding method, which is applied to a swing arm welding system in Embodiment 2 above, such as... Figure 6 As shown, the swing arm welding method may include steps S11, S12, and S13, which will be described in detail below:

[0063] like Figure 1 , Figure 3 As shown, the welding assembly 40 may include a moving unit 41 and a welding torch unit 42; the welding torch unit 42 includes a torch head 421 and a welding wire 422; one end of the torch head 421 is connected to the moving unit 41 and the other end is connected to the welding wire 422; the moving unit 41 may be a robotic arm, thereby automatically driving the welding wire 422 to move along a set trajectory through the torch head 421.

[0064] Step S11: The two side plates 13 and the pipe assembly 20 are positioned. Positioning includes the two side plates 13 being spaced apart along the axial direction of the pipe assembly 20, with the pipe assembly 20 positioned at the same end of the two side plates 13. The distance between the side plates 13 and the pipe assembly 20 is within a first set range, which can be 0-3mm, to facilitate welding of the side plates 13 and the pipe assembly 20 by the welding assembly 40. Figure 5 As shown, the distance A between the first end of the side plate 13 along the circumference of the pipe assembly 20 and the adjacent end of the pipe assembly 20 in the axial direction of the pipe assembly 20; Figure 5 As shown, the distance between the second end of the side plate 13 along the circumference of the pipe assembly 20 and the adjacent end of the pipe assembly 20 in the axial direction of the pipe assembly 20 is B; A < B; after the side plate 13 and the pipe assembly 20 are welded together to form a swing arm, if the pipe assembly 20 is subjected to a force along the direction from the pipe assembly 20 to the side plate 13, the larger distance between the two first ends along the axial direction of the pipe assembly 20 can form a longer resistance arm to resist the force, thereby ensuring sufficient connection strength between the side plate 13 and the pipe assembly 20.

[0065] In step S12, the welding assembly 40 welds an outer weld bead 51 at the junction of one side plate 13 away from the other side plate 13 and the pipe assembly 20; wherein, the outer weld bead 51 is located on the mutually distant side of the two side plates 13; the outer weld bead 51 is spaced apart from the first end of the side plate 13; M > 0; wherein, M is the minimum distance between the outer weld bead 51 and one end of the adjacent pipe assembly 20 along the axial direction of the pipe assembly 20.

[0066] In step S13, the welding assembly 40 welds the junction of one side plate 13 with the pipe assembly 20 near the other side plate 13 to form an inner weld bead 52. In this way, the heat of welding can be prevented as much as possible from causing deformation or even melting through the local position of the pipe assembly 20 near the first end, thereby improving the yield of the swing arm welding; it can also prevent the heat of welding during the welding of the outer weld bead 51 from causing large deformation of one axial end of the pipe assembly 20 and avoid melting through the axial end of the pipe assembly 20. The spacing control between the side plate 13 and the pipe assembly 20 allows the weld assembly 50 near the first end to provide higher connection strength, while the weld assembly 50 near the second end can provide a certain connection strength while avoiding damage to the sleeve, thus balancing the connection strength between the side plate 13 and the pipe assembly 20 and ensuring a high yield rate of welding. The welding method of the inner weld 52 is pulse welding, with a welding current of 200A, a welding voltage of 21V, and a welding speed of 10mm / s. The welding center can be the junction of one side plate 13 near the other side plate 13 and the pipe assembly 20.

[0067] Furthermore, one side plate can be welded first, and then the other side plate can be welded, or both side plates can be welded simultaneously.

[0068] Furthermore, step S12 includes steps S121 to S123, with steps S11, S121 to S123, and S13 executed sequentially. The steps will be described in detail below:

[0069] Step S12 includes:

[0070] In step S121, the welding wire 422 of the welding assembly 40 moves along the welding reference line from the second end of one side plate 13 towards the first end, thereby welding the side plate 13 and the pipe assembly 20 to form the first weld bead 5111. The welding reference line is the boundary line between the side of one side plate 13 away from the other side plate 13 and the pipe assembly 20. During the welding process, the offset of the welding wire 422 from the welding reference line is within a second set range, which can be 0~2mm. Making the welding wire 422 coincide with the welding reference line as much as possible can improve the consistency of the connection strength, and this direct welding method can improve the welding efficiency. The welding reference line can be theoretically the boundary line between the side of one side plate 13 away from the other side plate 13 and the pipe assembly 20, or it can be obtained from the actual product. The welding method of the first weld bead 5111 can be pulse welding, with a welding current of 200A, a welding voltage of 21V, and a welding speed of 10mm / s.

[0071] In step S122, based on the formation of the first weld bead 5111, the welding wire 422 continues to move along the direction from the second end to the first end of a side plate 13 in a first set state, thereby forming a rear weld bead 5112 of the first weld bead 511; wherein, the first weld bead 5111 is located on the side of the rear weld bead 5112 near the second end; the first set state includes the welding wire 422 rotating about a set axis, and the set axis moving along the direction from the second end to the first end; the rear weld bead 5112 is closer to one axial end of the adjacent pipe assembly 20 than the front weld bead 5111, and this spiral welding method allows the heat generated by welding to be distributed. More uniform heat distribution avoids concentrated heat that could cause severe deformation or even melt-through in certain areas of the material. Furthermore, the moving unit 41 that drives the welding wire 422 is a robotic arm, making it more convenient to set a rotation axis and control its movement in the robotic arm's programming. The welding method for the rear weld 5112 is spiral oscillating welding. When the welding wire 422 touches the pipe assembly 20, the welding current is 210A and the welding voltage is 19V. When the welding wire 422 touches the side plate 13, the welding current is 220A and the welding voltage is 20V. The welding speed is 11mm / s, the oscillation amplitude of the welding wire is 1.2mm, and the frequency is 2.5Hz.

[0072] Step S123: Based on the formation of the subsequent weld bead 5112, the welding wire 422 continues to move along the direction from the second end to the first end of a side plate 13 in a second set state, thereby forming the second weld bead 512, such that the connection strength between the subsequent weld bead 5112 and the side plate 13 is greater than the connection strength between the subsequent weld bead 5112 and the pipe assembly 20; wherein, the preceding weld bead 5111, the subsequent weld bead 5112, and the second weld bead 512 are arranged sequentially; the second set state includes the welding wire 422 rotating around a set axis, the set axis moving along the direction from the second end to the first end, and the set axis moving to the first end. A small portion of the movement trajectory is offset to the side of the welding reference line near the side plate 13, with an offset distance of 1~5mm. The second weld 512 is closer to one end of the adjacent pipe assembly 20 axially than the subsequent weld 5112, and the probability of weld penetration is highest at this position. This spiral welding method allows for more uniform heat distribution during welding. Setting at least a portion of the movement trajectory offset to the side of the welding reference line near the side plate 13 can prevent excessive heating on the pipe assembly 20, thus balancing weld strength and preventing welding failure of the swing arm. The welding method of the second weld 512 is spiral swing welding. When the welding wire 422 touches the pipe assembly 20, the welding current is 200A and the welding voltage is 18V. When the welding wire 422 touches the side plate 13, the welding current is 210A and the welding voltage is 19V. The welding speed is 12mm / s, the swing amplitude of the welding wire is 1mm, and the frequency is 2Hz.

[0073] Furthermore, when welding wire 422 welds a local position of the rear weld 5112 near the front weld 5111, while the welding wire rotates around a set axis, at least a portion of the movement trajectory of the set axis shifts towards the pipe assembly 20, and the shift distance can be 1~5mm. When the welding wire 422 touches the pipe assembly 20, the welding current is 220A and the welding voltage is 20V; when the welding wire 422 touches the side plate 13, the welding current is 230A and the welding voltage is 21V. The welding speed is 10mm / s, the welding wire swing amplitude is 1.5mm, and the frequency is 3Hz. When welding wire 422 welds a local position of the rear weld 5112 away from the front weld 5111, it is still performed according to step S123. Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A swing arm, characterized in that, The swing arm includes: The arm assembly includes two side plates; A pipe assembly, wherein two side plates are sequentially spaced apart along the axial direction of the pipe assembly; the outer circumferential surface of the pipe assembly is welded to one end of each of the two side plates to form a weld bead assembly; the distance A between the first end of the side plate along the circumference of the pipe assembly and its adjacent end on the pipe assembly is in the axial direction of the pipe assembly; the distance B between the second end of the side plate along the circumference of the pipe assembly and its adjacent end on the pipe assembly is in the axial direction of the pipe assembly; A < B; The weld assembly includes an outer weld and an inner weld; the outer weld is disposed on the mutually distant side of the two side plates; the outer weld is spaced apart from the first end of the side plate; the inner weld is disposed on the mutually close side of the two side plates; M > 0; where M is the minimum distance between the outer weld and one end of the adjacent pipe assembly along the axial direction of the pipe assembly.

2. A swing arm according to claim 1, characterized in that, The projection area of ​​the outer weld bead along the thickness direction of the side plate partially overlaps with the projection area of ​​the adjacent inner weld bead along the thickness direction of the side plate.

3. A swing arm according to claim 1, characterized in that, A>Z×K; where Z is the dimension of the outer weld bead along the axial direction of the pipe assembly; K≥1.

4. A swing arm according to claim 1, characterized in that, The distance between the side plate and the adjacent end of the tube assembly in the axial direction of the tube assembly gradually increases from the first end to the second end.

5. A swing arm according to claim 4, characterized in that, The outer weld bead includes a first weld bead and a second weld bead; the first weld bead and the second weld bead are arranged sequentially along the direction from the second end to the first end; The difference between the connection strength of the first weld bead and the pipe assembly and the connection strength of the first weld bead and the side plate is within a set strength range.

6. A swing arm according to claim 5, characterized in that, The connection strength between the second weld bead and the pipe assembly is less than the connection strength between the second weld bead and the side plate.

7. A swing arm according to claim 6, characterized in that, The distance between the adjacent sides of the two side plates along the axial direction of the tube assembly decreases from the first end to the second end; the inner weld bead is spaced apart from the second end of the side plate.

8. A swing arm according to claim 1, characterized in that, The arm assembly also includes a middle plate; the middle plate is fixedly connected to one end of the two side plates along the circumferential direction of the tube assembly; the middle plate is connected to the tube assembly.

9. A welding system, characterized in that, The welding system is applied to a swing arm according to any one of claims 1 to 8, and the welding system comprises: Fixture components, welding components; The welding state of the welding system includes the fixture assembly being detachably connected to the side plate and the pipe assembly respectively, and the welding assembly welding the junction of the side plate and the pipe assembly to form the weld bead assembly.

10. A welding method, characterized in that, The welding method is applied to the welding system according to claim 9, and the welding method includes: The two side plates and the pipe assembly are positioned respectively; wherein, the positioning is completed by the two side plates being spaced apart along the axial direction of the pipe assembly, the pipe assembly being disposed at one end of the two side plates, the distance between the side plates and the pipe assembly being within a first predetermined range, the distance between the first end of the side plate along the circumference of the pipe assembly and its adjacent end on the pipe assembly being A in the axial direction of the pipe assembly; the distance between the second end of the side plate along the circumference of the pipe assembly and its adjacent end on the pipe assembly being B in the axial direction of the pipe assembly; A < B; A welding assembly welds an outer weld bead at the junction of one of the side plates away from the other side plate and the pipe assembly; wherein the outer weld bead is located on the mutually distant sides of the two side plates; the outer weld bead is spaced apart from the first end of the side plate; M > 0; wherein M is the minimum distance between the outer weld bead and one end of the adjacent pipe assembly along the axial direction of the pipe assembly; The welding assembly welds an inner weld bead at the junction of one of the side plates near the other side plate and the pipe assembly.

11. A welding method according to claim 10, characterized in that, The welding assembly forms an outer weld bead at the junction of one of the side plates away from the other side plate and the pipe assembly, including: The welding wire of the welding assembly welds the first weld bead to the side plate and the pipe assembly from the second end toward the first end along the welding reference line; wherein, the welding reference line is the boundary line between the side plate away from the other side plate and the pipe assembly, and the offset of the welding wire from the welding reference line during the welding process is within a second set range. Based on the formation of the first weld bead, the welding wire moves in a first set state to form a second weld bead; wherein, the first weld bead is located on the side of the second weld bead near the second end; the first set state includes the welding wire rotating about a set axis, and the set axis moving in the direction from the second end to the first end. Based on the formation of the rear weld bead, the welding wire moves in a second set state to form a second weld bead; wherein, the front weld bead, the rear weld bead, and the second weld bead are arranged in sequence; the second set state includes the welding wire rotating around a set axis, the set axis moving along the direction from the second end to the first end, and at least a portion of the movement trajectory of the set axis being offset on the side of the welding reference line near the side plate.

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