Method for welding rim and spoke made of different materials and wheel

Abstract

According to the welding method for the rim and the spoke made of the different materials and the wheel, heat is generated in a rotary friction mode so that the materials can reach a soft and flowable plastic state, and therefore the two different materials can be mixed with each other conveniently; therefore, stable and reliable connection between the rim and the spoke which are made of different materials is ensured; the influence of heat on the material can be controlled in a friction stir welding mode, so that the heat affected area is not too large, and the situation that the stability of the wheel is affected by the change of the internal structure of the material due to too high temperature during welding is facilitated; and heat generated during welding can be uniformly dispersed from the center to the periphery, so that the influence of the temperature on the material can be relatively average, and the temperature borne by the internal structure of the material can be ensured to be within a control range.

Description

Technical Field

[0001] The invention relates to the technical field of wheels, and in particular to a method for welding a rim and a spoke made of different materials and a wheel. Background Art

[0002] The automobile industry occupies a pivotal position in my country's economic development. Its rapid development has brought about the continuous improvement of the industrial chain. In this process, the design and manufacturing level of automobile parts are also constantly improving to meet the increasingly stringent market demand. Wheels are a key component of automobile driving, and their performance and quality have a vital impact on the performance of the entire vehicle. It can be said that high-quality wheels are the basis for ensuring safe, comfortable and efficient driving of automobiles. The performance of wheels directly affects the driving stability of the car. The quality of wheels has an important impact on the comfort of the car. The performance and quality of wheels are also related to the safety of the car. Therefore, it is necessary to continuously improve the design and manufacturing level of wheels to meet the needs of the market and consumers.

[0003] For example, the patent document with Chinese patent application number 201922249732.5 and announcement date 2020.08.04 discloses a combined wheel and a car, wherein the combined wheel includes a rim and spokes; wherein the rim and the spokes are combined and fixed together, the rim is made of an aluminum alloy with good spinning performance and is made by a spinning process; the spokes are made of an aluminum alloy with good fluidity and are made by a low-pressure casting process; a curling structure is provided at the inner edge of the rim.

[0004] For example, the prior art of the document uses a composite of two different materials, but it simply fixes the two materials together by welding. It does not take into account that due to the different temperatures that the two materials can withstand during welding, one of the materials is affected by the welding temperature and deformed, while the other material is not affected by the temperature, which ultimately leads to the two materials being unable to be completely fused together. In this way, the two materials can only be fixed by relying on the solder used in traditional welding. Summary of the invention

[0005] The present invention provides a welding method and a wheel between a rim and spokes made of different materials, which generates heat by means of rotational friction so that the material can reach a soft and flowable plastic state, thereby facilitating the mixing of the two different materials, thereby ensuring a stable and reliable connection between the rim and spokes made of different materials.

[0006] To achieve the above object, the technical solution of the present invention is: a method for welding a rim and a spoke made of different materials, the specific steps comprising: (1) Fit the rim and the spoke together so that the bottom end of the rim abuts against the first welding platform.

[0007] (2) Extend the supporting mold into the wheel so that the bottom of the first welding platform is placed on the supporting mold to form a rigid support.

[0008] (3) Welding is performed by friction stir welding.

[0009] (4) Drive the welding needle to move to the center position of the first welding platform and move downward to pass through the rim and the first welding platform.

[0010] (5) During the movement of the welding needle, the welding needle rotates, and the rotation causes friction and plastic deformation between the rim and the first welding platform to generate heat.

[0011] (6) Heat is used to make the rim and the first welding platform reach a flowable plastic state.

[0012] (7) The welding needle continues to move downward, forcing the rim and the first welding platform to mix around the welding needle by rotating and moving downward to form a uniform weld.

[0013] (8) The welding needle is reset and a solid weld is formed after the rim and the first welding platform cool naturally.

[0014] The above method ensures that the wheel can be lightweight by using spokes made of lighter materials, while at the same time ensuring the overall rigidity of the wheel by using a relatively heavier rim. By setting materials of different weights, the wheel can be lightweight while ensuring sufficient rigidity. A curling edge is also provided at the other end of the rim, so that the edge of the other end of the rim is curled, so that the thickness of the rim is increased in the length direction, and the curling edge is subjected to upward and inward bending forces, thereby generating a force along the lateral direction of the rim, thereby further increasing the rigidity of the rim from the force, thereby improving the structural strength of the rim, and at the same time, there is no need to increase the structural strength of the rim by increasing the thickness of the rim edge, which leads to complicated processing, thereby making the rigidity of the wheel better. At the same time, a guide platform is provided on the first welding platform, so that when the rim and the spokes are welded, During processing, the guide table and the guide block facilitate the alignment of the rim with the spoke and better ensure that the first welding table and the bottom end of the rim are in contact, thereby facilitating welding; heat is generated by means of rotational friction so that the material can reach a soft and flowable plastic state, thereby facilitating the mixing of two different materials, thereby ensuring that the connection between the rim and the spoke of different materials is stable and reliable; and friction stir welding is used to control the effect of heat on the material so that the heat-affected area is not too large, which facilitates the change of the internal structure of the material due to excessive temperature during welding and affects the stability of the wheel. At the same time, since the weld is located at the center of the contact surface between the first welding table and the rim, the heat generated during welding will also be evenly dispersed from the center to the surrounding areas, which can also ensure that the temperature has a relatively even effect on the material, thereby ensuring that the temperature borne by the internal structure of the material is within a controllable range.

[0015] Furthermore, a first welding platform is provided at one end of the spoke close to the rim, and the bottom end of the rim is in abutment contact with the first welding platform; the first welding platform includes a main body and a support body, a support body is protruding outwardly from one side of the main body, and the support body extends toward the other end of the rim and is in abutment contact with the bottom end of the rim.

[0016] With this arrangement, the welding between the spoke and the rim can be facilitated by the first welding platform.

[0017] Furthermore, a second welding platform is provided on the spoke above the first welding platform, and a bridge is provided on one end of the rim, one end of the bridge is connected to one end of the rim, and the other end of the bridge is connected to the second welding platform, forming a noise reduction cavity between the tower bridge and the first welding platform.

[0018] The above arrangement can achieve wheel noise reduction by providing a noise reduction cavity.

[0019] Furthermore, a welding platform corresponding to the bridge is provided on the second welding platform, and the other end of the bridge is connected to the welding platform by welding; after step (8), the other end of the bridge and the welding platform are welded by friction stir welding.

[0020] The above arrangement facilitates the welding of the bridge through the welding table.

[0021] Furthermore, the welding platform is arranged above the support body, the upper end surface of the support body abuts against the middle part of the bridge, and the support body, the bridge and the welding platform form a noise reduction cavity.

[0022] In the above arrangement, the bridge is supported by the support body and a noise reduction cavity is formed by welding the bridge and the welding table. The formation method is simple and reliable.

[0023] Furthermore, the bridge includes a bridge body, a recessed cavity is formed downwardly in the middle of the bridge body, two side walls of the recessed cavity are inclined outwardly and upwardly, and the bottom of one side wall of the recessed cavity close to the first welding platform is in contact with the support body.

[0024] The above arrangement allows the wrapped tire to enter and be guided better through the inclined side walls of the recessed cavity, and also supports the bottom of the inclined side walls, thereby increasing the supporting contact surface of the bridge and increasing the supporting force.

[0025] Furthermore, the material of the spoke is cast aluminum alloy A356; the tensile strength of the spoke is 260Mpa, the yield strength is 160Mpa, the elongation strength is 7%, and the hardness is 85HB; the material of the rim is 6061 aluminum alloy, the tensile strength of the rim is 310Mpa, the yield strength is 260Mpa, the elongation strength is 12%, and the hardness is 116HB.

[0026] The above arrangement ensures that the rigidity of the rim is greater than the rigidity of the spokes by determining the structural strength of the spoke and rim materials.

[0027] Furthermore, the calculation formula of the rigidity strength of the wheel is:

[0028] Where K is the rigidity of the wheel, is the vibration frequency of the rim, is the vibration frequency of the spoke, and M is the weight of the wheel.

[0029] The above arrangement calculates the rigidity of the wheel, thereby determining that the rigidity of the wheel is less than the rigidity of the rim and greater than the rigidity of the spokes; the weight of the spokes is less than the weight of the rim, thereby making the wheel lightweight while being rigid enough.

[0030] Furthermore, the rotation speed of the welding needle is 900-2500 r / min; the local temperature of the weld is 430-510°; and the forward speed of the welding needle is 200 mm-1000 mm / min.

[0031] The above setting, by controlling the rotation speed and forward speed of the welding needle, facilitates controlling the local temperature of the weld within the tolerable temperature range of the two different materials, thereby preventing excessive temperature from causing changes in the internal structure of the material and reducing performance.

[0032] On the other hand, the present invention provides a wheel, including a rim and spokes, one end of the rim is connected to the spokes, and is characterized in that: the other end of the rim is bent downward to form a curled edge, and a noise reduction cavity is provided between the rim and the spokes; the rigidity strength of the rim is greater than the rigidity strength of the spokes, and the rigidity strength of the rim is greater than the rigidity strength of the spokes; the weight of the spokes is less than the weight of the rim; a first welding platform is provided at one end of the spoke close to the rim, and the bottom end of the rim is in contact with the first welding platform; the first welding platform includes a main body and a support body, one side of the main body is provided with a support body protruding outward, the support body extends toward the other end of the rim and is in contact with the bottom end of the rim, and a weld is provided on the rim above the center of the first welding platform, which runs from the top end of the rim to the bottom end.

[0033] The above structure forms a wheel by arranging a weld seam, and ensures that the wheel can be lightweight by using spokes made of lighter materials, while at the same time ensuring the overall rigidity of the wheel by using a relatively heavier rim. By arranging materials of different weights, the wheel can be lightweight while ensuring sufficient rigidity. A curling edge is also provided at the other end of the rim, so that the edge of the other end of the rim is curled, so that the thickness of the rim is increased in the length direction, and the curling edge is subjected to upward and inward bending forces, thereby generating a force along the lateral direction of the rim, thereby further increasing the rigidity of the rim from the force, thereby improving the structural strength of the rim, and at the same time, there is no need to increase the structural strength of the rim by increasing the thickness of the rim edge, which leads to complicated processing, thereby making the rigidity of the wheel better; at the same time, a guide platform is provided on the first welding platform, so that When processing the rim and the spoke, the guide table and the guide block facilitate the alignment of the rim with the spoke and better ensure that the first welding table and the bottom end of the rim are in contact, thereby facilitating welding; heat is generated by means of rotational friction so that the material can reach a soft and flowable plastic state, thereby facilitating the mixing of two different materials, thereby ensuring that the connection between the rim and the spoke of different materials is stable and reliable; and friction stir welding is used to control the effect of heat on the material so that the heat-affected area is not too large, which facilitates the change of the internal structure of the material due to excessive temperature during welding and affects the stability of the wheel. At the same time, since the weld is located at the center of the contact surface between the first welding table and the rim, the heat generated during welding will also be evenly dispersed from the center to the surrounding area, which can also ensure that the effect of temperature on the material is relatively even, thereby ensuring that the temperature of the internal structure of the material can be within a controllable range. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the connection structure between the rim and the spokes in Example 1 of the present invention.

[0035] Figure 2 This is a schematic diagram of the connection structure between the rim and the spokes in Example 2 of the present invention.

[0036] Figure 3 It is a schematic structural diagram of the wheel hub of the wheel of the present invention.

[0037] Figure 4 It is a working principle diagram of the present invention. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Example 1.

[0040] like Figure 1As shown, a wheel comprises a rim 1 and spokes 2, wherein the rim 1 and the spokes 2 are connected to each other by welding to form a wheel, one end of the rim 1 is connected to the spokes 2, and the other end of the rim 1 is bent outward, upward, inward and downward to form a curling edge 11, and a noise reduction cavity 3 is provided between the rim 1 and the spokes 2. A first welding platform 21 is provided at one end of the spoke 2 close to the rim 1, and the bottom end of the rim 1 is in contact with the first welding platform 21; the first welding platform 21 includes a main body 211 and a support body 212, and a support body 212 is protruded outwardly on one side of the main body 211, and the support body 212 extends toward the other end of the rim 1 and is in contact with the bottom end of the rim 1, and a guide platform 213 extending downward and outward is provided at one end of the support body 212 away from the main body 211, and a guide block 10 corresponding to the guide platform 213 is provided at the bottom end of the rim 1.

[0041] A second welding platform 22 is provided on the spoke 2 above the first welding platform 21, a bridge 12 is provided on one end of the rim 1, one end of the bridge 12 is connected to one end of the rim 1, and the other end of the bridge 12 is connected to the second welding platform 22, and a noise reduction cavity 3 is formed between the tower bridge 12 and the first welding platform 22. By providing the noise reduction cavity 3, the noise reduction of the wheel can be achieved.

[0042] A welding platform corresponding to the bridge 12 is provided on the second welding platform 22, and the other end of the bridge 12 is connected to the welding platform 23 by welding. The welding platform 23 facilitates the welding of the bridge.

[0043] A cavity 110 is formed between the other end of the rim 1 and the bead 11. Since the cavity is formed between the other end of the rim 1 and the bead 11, when the tire is placed in the wheel hub, the bead 11 provides a buffer space when subjected to the squeezing force of the wheel, thereby preventing the tire from damaging the other end of the rim 1 and thus affecting the rigidity of the rim 1.

[0044] The other end of the rim 1 is tilted upward and outward, so that the other end of the rim 1 is tilted upward and outward, thereby increasing the accommodation area of ​​the other end of the rim 1 and further improving the rigidity of the rim 1.

[0045] The height of the step of the welding platform 23 is matched with the thickness of one end of the bridge 12. After the bridge 12 is welded on the welding platform 23, a plane can be formed, ensuring that the welding platform 23 and the bridge 12 form a plane.

[0046] The first welding platform 21 also includes a main body 211 and a support body 212. The support body 212 is protruding outward from one side of the main body 211. The welding platform 23 is arranged above the support body 212. The upper end surface of the support body 212 abuts against the middle of the bridge 12. The support body 212, the bridge 12 and the welding platform 23 form a noise reduction cavity 3. The bridge 12 is supported by the support body 212, and the bridge 12 and the welding platform 23 are welded to form a noise reduction cavity 3. The formation method is simple and reliable.

[0047] The bridge 12 includes a bridge body 121, a concave cavity 122 is formed downward in the middle of the bridge body 121, and the two side walls of the concave cavity 122 are inclined outward and upward, and the bottom of one side wall of the concave cavity 122 close to the first welding platform 21 is in contact with the support body 212. The inclined concave cavity side wall can better allow the wrapped tire to enter and guide, and the bottom of the inclined side wall is supported, so that the supporting contact surface of the bridge can be increased without the need for increasing the supporting force.

[0048] In this embodiment, the material of the spoke 2 is cast aluminum alloy A356, the tensile strength of the spoke 2 is 260 MPa, the yield strength is 160 MPa, the elongation strength is 7%, and the hardness is 85 HB.

[0049] In this embodiment, the material of the rim 1 is 6061 aluminum alloy, the tensile strength of the rim 1 is 310 MPa, the yield strength is 260 MPa, the elongation strength is 12%, and the hardness is 116 HB.

[0050] By determining the structural strength of the materials of the wheel spoke 2 and the wheel rim 1 , it is ensured that the rigidity of the wheel rim 1 is greater than the rigidity of the wheel spoke 2 .

[0051] The calculation formula of the rigidity strength of the wheel is:

[0052] Where K is the rigidity of the wheel, is the vibration frequency of the rim, is the vibration frequency of the spoke, and M is the weight of the wheel. By calculating the rigidity of the wheel, it is determined that the rigidity of the wheel is less than the rigidity of the rim and greater than the rigidity of the spoke; the weight of the spoke is less than the weight of the rim, so that the wheel is lightweight and rigid enough.

[0053] The rotation speed of the welding needle is 900-2500r / min; the local temperature of the weld is 430-510°; and the forward speed of the welding needle is 200mm-1000mm / min. By controlling the rotation speed and forward speed of the welding needle, the local temperature of the weld can be controlled within the temperature range of the two different materials, thereby preventing the internal structure of the material from changing due to excessive temperature and reducing performance.

[0054] like Figure 4 As shown, a method for welding a rim and a spoke made of different materials is characterized in that the specific steps include: (1) Fit the rim and the spoke together so that the guide block 10 at the bottom end of the rim abuts against the guide platform 213 of the first welding platform.

[0055] (2) Extend the supporting mold into the wheel so that the bottom of the first welding platform is placed on the supporting mold to form a rigid support.

[0056] (3) Welding is performed by friction stir welding.

[0057] (4) Drive the welding needle to move to the center position of the first welding platform and move downward to pass through the rim and the first welding platform.

[0058] (5) During the movement of the welding needle, the welding needle rotates, and the rotation causes friction and plastic deformation between the rim and the first welding platform to generate heat.

[0059] (6) The rim and the first welding platform are made to reach a soft and flowable plastic state by heat. In this embodiment, the state where the liquid index is within the following range, 0.75<liquidity index≤1 is a soft plastic state.

[0060] (7) The welding needle continues to move downward, forcing the rim and the first welding platform to mix around the welding needle by rotating and moving downward to form a uniform weld.

[0061] (8) The welding needle is reset and a solid weld is formed after the rim and the first welding platform cool naturally.

[0062] After step (8), the method further includes welding the other end of the bridge to the welding platform by friction stir welding.

[0063] The beneficial effects of the present invention are as follows: the wheel is lightweight by means of the spokes made of lighter materials, while the rigidity of the entire wheel is ensured by means of the relatively heavier rim; by arranging materials of different weights, the wheel is lightweight while ensuring sufficient rigidity; a curling edge is further arranged at the other end of the rim, so that the edge of the other end of the rim is curled, so that the thickness of the rim is increased in the length direction, and the curling edge is subjected to upward and inward bending forces, thereby generating a force along the lateral direction of the rim, thereby further increasing the rigidity of the rim from the perspective of force, thereby improving the structural strength of the rim; and at the same time, there is no need to increase the structural strength of the rim by increasing the thickness of the rim edge, which results in complicated processing, thereby making the rigidity of the wheel better; at the same time, by arranging a guide platform on the first welding platform, the rim and the wheel are welded together. When the spoke is processed, the guide table and the guide block facilitate the alignment of the rim with the spoke and better ensure that the first welding table and the bottom end of the rim are in contact, thereby facilitating welding; heat is generated by means of rotational friction so that the material can reach a soft and flowable plastic state, thereby facilitating the mixing of two different materials, thereby ensuring that the connection between the rim and the spoke of different materials is stable and reliable; and friction stir welding is used to control the effect of heat on the material so that the heat-affected area is not too large, which facilitates the change of the internal structure of the material due to excessive temperature during welding and affects the stability of the wheel. At the same time, since the weld is located at the center of the contact surface between the first welding table and the rim, the heat generated during welding will also be evenly dispersed from the center to the surrounding area, which can also ensure that the effect of temperature on the material is relatively even, thereby ensuring that the temperature borne by the internal structure of the material is within a controllable range.

[0064] During welding, the stirring head extends from the weld into the first welding platform 21 and performs welding. Since the weld is located at the center of the first welding platform 21, when the temperature generated by welding diffuses outward from the weld, the temperature borne by the first welding platform 21 will be relatively even, thereby ensuring that the contact area temperature between the first welding platform 21 and the rim 1 will not be relatively too high. Since the weld is located at the center of the first welding platform 21, the welding stability can be ensured while ensuring that the temperature can be maintained within a range that is not easy to damage the internal structure of the rim and the spokes, thereby ensuring that the stability of the two materials can be ensured when two different materials are used to form a wheel, thereby achieving lightweight wheels while ensuring that the rigidity of the wheels is not too low.

[0065] Example 2.

[0066] The other features of this embodiment are the same as those of embodiment 1, except that: Figure 2As shown, a first welding platform 21 is provided at one end of the spoke 2 close to the rim 1, and the bottom end of the rim 1 is in contact with the first welding platform 21; the first welding platform 21 includes a main body 211 and a support body 212, and a support body 212 is provided on one side of the main body 211 to protrude outward, and the support body 212 extends toward the other end of the rim and is in contact with the bottom end of the rim 1; a weld (not shown in the figure) is provided on the rim 1 above the first welding platform 21, which runs from the top end of the rim 1 to the bottom end; the first welding platform 21 facilitates the welding between the spoke 2 and the rim 1. In this embodiment, the weld is located at the center of the first welding platform 21, and the rim 1 and the spoke 2 are welded by friction stir welding.

[0067] The welding method corresponding to this embodiment is a welding method between a rim and a spoke made of different materials, and the specific steps include: (1) Fit the rim and the spoke together so that the bottom end of the rim abuts against the first welding platform.

[0068] (2) Extend the supporting mold into the wheel so that the bottom of the first welding platform is placed on the supporting mold to form a rigid support.

[0069] (3) Welding is performed by friction stir welding.

[0070] (4) Drive the welding needle to move to the center position of the first welding platform and move downward to pass through the rim and the first welding platform.

[0071] (5) During the movement of the welding needle, the welding needle rotates, and the rotation causes friction and plastic deformation between the rim and the first welding platform to generate heat.

[0072] (6) The rim and the first welding platform are made to reach a soft and flowable plastic state by heat. In this embodiment, the state where the liquid index is within the following range, 0.75<liquidity index≤1 is a soft plastic state.

[0073] (7) The welding needle continues to move downward, forcing the rim and the first welding platform to mix around the welding needle by rotating and moving downward to form a uniform weld.

[0074] (8) The welding needle is reset and a solid weld is formed after the rim and the first welding platform cool naturally.

[0075] After step (8), the method further includes welding the other end of the bridge to the welding platform by friction stir welding.

Claims

1. A method for welding a rim and a spoke made of different materials, characterized in that: The specific steps include: (1) Fitting the rim and the spoke together so that the bottom end of the rim abuts against the first welding platform; (2) extending the support mold into the wheel so that the bottom of the first welding platform is placed on the support mold to form a rigid support; (3) Welding by friction stir welding; (4) driving the welding needle to move to the center position of the first welding platform and move downward to pass through the rim and the first welding platform; (5) During the movement of the welding needle, the welding needle rotates, and the rotation causes friction and plastic deformation between the rim and the first welding platform to generate heat; (6) The rim and the first welding platform are made to reach a flowable plastic state by heat; (7) The welding needle continues to move downward, forcing the rim and the first welding platform to mix around the welding needle by rotating and moving downward to form a uniform weld; (8) The welding needle is reset and a solid weld is formed after the rim and the first welding platform cool naturally.

2. The method for welding a rim and a spoke made of different materials according to claim 1, characterized in that: A first welding platform is provided at one end of the spoke close to the rim, and the bottom end of the rim is in contact with the first welding platform; the first welding platform includes a main body and a support body, one side of the main body is provided with a support body protruding outward, and the support body extends toward the other end of the rim and is in contact with the bottom end of the rim.

3. The method for welding a rim and a spoke made of different materials according to claim 2, characterized in that: A second welding platform is provided on the spoke above the first welding platform, a bridge is provided on one end of the rim, one end of the bridge is connected to one end of the rim, and the other end of the bridge is connected to the second welding platform, forming a noise reduction cavity between the tower bridge and the first welding platform.

4. The method for welding a rim and a spoke made of different materials according to claim 3, characterized in that: A welding platform corresponding to the bridge is provided on the second welding platform, and the other end of the bridge is connected to the welding platform by welding; After step (8), the other end of the bridge is welded to the welding table by friction stir welding.

5. The method for welding a rim and a spoke made of different materials according to claim 4, characterized in that: The welding platform is arranged above the supporting body, the upper end surface of the supporting body abuts against the middle part of the bridge, and the supporting body, the bridge and the welding platform form a noise reduction cavity.

6. The method for welding a rim and a spoke made of different materials according to claim 5, characterized in that: The bridge comprises a bridge body, the middle of which forms a concave cavity downwards, and the two side walls of the concave cavity are inclined outwards and upwards, and the bottom of one side wall of the concave cavity close to the first welding platform abuts against the support body.

7. The method for welding a rim and a spoke made of different materials according to claim 1, characterized in that: The material of the spoke is cast aluminum alloy A356; the tensile strength of the spoke is 260Mpa, the yield strength is 160Mpa, the elongation strength is 7%, and the hardness is 85HB; The material of the rim is 6061 aluminum alloy, the tensile strength of the rim is 310 MPa, the yield strength is 260 MPa, the elongation strength is 12%, and the hardness is 116 HB.

8. The method for welding a rim and a spoke made of different materials according to claim 7, characterized in that: The calculation formula of the rigidity strength of the wheel is: Where K is the rigidity of the wheel, is the vibration frequency of the rim, is the vibration frequency of the spoke, and M is the weight of the wheel.

9. The method for welding a rim and a spoke made of different materials according to claim 1, characterized in that: The rotation speed of the welding needle is 900-2500r / min; the local temperature of the weld is 430-510°; and the forward speed of the welding needle is 200mm-1000mm / min.

10. A wheel made by the welding method between a rim and a spoke of different materials according to claim 1, comprising a rim and a spoke, one end of the rim being connected to the spoke, characterized in that: The other end of the rim is bent downward to form a curled edge, and a noise reduction cavity is provided between the rim and the spokes; the rigidity strength of the rim is greater than that of the spokes, and the rigidity strength of the rim is greater than that of the spokes; the weight of the spokes is less than the weight of the rim; a first welding platform is provided at one end of the spokes close to the rim, and the bottom end of the rim is in contact with the first welding platform; the first welding platform includes a main body and a support body, a support body is provided on one side of the main body protruding outward, the support body extends toward the other end of the rim and is in contact with the bottom end of the rim, and a weld is provided on the rim above the center of the first welding platform, which runs from the top end of the rim to the bottom end.

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