Preparation method of mudguard support, mudguard support and vehicle

Abstract

The invention relates to the technical field of vehicles, in particular to a preparation method of a fender support, the fender support and a vehicle, and aims to solve the problem that in the prior art, when a vehicle runs, the fender support is prone to breakage at a welding joint position. In order to achieve the purpose, raw materials for preparing the fender support comprise an aluminum pipe beam, a steel base and a steel pipe fixedly arranged on the steel base, a zinc coating is arranged on the outer surface of the steel pipe, the steel pipe can be sleeved with the aluminum pipe beam, the zinc coating faces the aluminum pipe beam, and the preparation method of the fender support comprises the steps that the steel pipe is sleeved with the aluminum pipe beam, and the steel pipe and the aluminum pipe beam are welded; the welding temperature is controlled within a preset temperature range, so that Fe (ZnAl) 10 is generated between the steel pipe and the aluminum pipe beam; and the welded steel pipe and aluminum pipe beam are cooled. The steel pipe is galvanized, and Fe (ZnAl) 10 can be generated in the welding process of the steel pipe and the aluminum pipe beam, so that the toughness, the tensile strength and the ductility of a welding joint are enhanced, and the possibility of cracking of the steel-aluminum welding joint is further reduced.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and specifically provides a method for preparing a fender bracket, a fender bracket and a vehicle. Background Art

[0002] The vehicles in the prior art generally include fenders, which are mainly used to prevent the damage and destruction of the vehicle chassis structure caused by the splash of stones and the like during the operation of the vehicle. The fenders are generally supported by fender brackets. The fender brackets are cantilever parts on the vehicle, which are mostly welded by a steel base and a pipe beam. However, the welding area often cracks due to severe vibration of the vehicle or impact of the fender bracket, thereby affecting the normal operation of the vehicle. Summary of the invention

[0003] The present application aims to solve the above technical problem, that is, to solve the problem in the prior art that the fender bracket is prone to breakage at the welding joint during vehicle operation.

[0004] The present application provides a method for preparing a fender bracket, wherein the fender bracket is prepared by an aluminum tube beam, a steel base, and a steel tube fixed to the steel base, wherein the outer surface of the steel tube is provided with a galvanized layer, the aluminum tube beam can be sleeved on the steel tube, and the galvanized layer faces the aluminum tube beam, and the preparation method comprises:

[0005] The aluminum tube beam is sleeved outside the steel tube, and the steel tube and the aluminum tube beam are welded;

[0006] The welding temperature is controlled within a preset temperature range so that an intermetallic compound Fe(ZnAl) is generated between the steel tube and the aluminum tube beam. 10 ;

[0007] The welded steel pipe and the aluminum tube beam are cooled.

[0008] In an optional technical solution of the above-mentioned method for preparing the fender bracket, the preset temperature range is not less than 460 degrees Celsius and not more than 530 degrees Celsius.

[0009] In the optional technical solution of the method for preparing the fender bracket, "sleeving the aluminum tube beam outside the steel tube, and welding the steel tube and the aluminum tube beam" specifically includes the following steps:

[0010] Fix the steel base and the steel pipe disposed on the steel base, and control the axis of the aluminum tube beam and the axis of the steel pipe to be located on the same straight line;

[0011] The aluminum tube beam is controlled to rotate around the axis and move along the straight line where the axis is located toward the direction approaching the steel tube, so that the aluminum tube beam is rotatably sleeved on the steel tube and is welded with the steel tube through rotational friction.

[0012] In an optional technical solution of the method for preparing the above-mentioned fender bracket, the thickness of the galvanized layer is not less than 15um and not more than 25um.

[0013] The present application also provides a fender bracket, which is prepared by the fender bracket preparation method described in any one of the above technical solutions, and the fender bracket includes a steel base, a steel pipe fixed to the steel base, and an aluminum tube beam sleeved and welded to the steel pipe.

[0014] In the optional technical solution of the above-mentioned fender bracket, the outer wall of the steel tube is provided with a plurality of annular grooves, the plurality of annular grooves are arranged along the axial direction of the steel tube, the annular grooves are arranged facing the aluminum tube beam, and the annular grooves are used to receive the molten or softened flowing aluminum alloy formed during the welding process of the steel tube and the aluminum tube beam.

[0015] In the optional technical solution of the above-mentioned fender bracket, the steel base includes a steel base body and a connecting part fixedly arranged on the steel base body, the connecting part is annular, and the end of the connecting part away from the steel base body is fixedly connected to the steel pipe, the connecting part has the same inner diameter as the steel pipe, and the outer diameter of the connecting part gradually increases from the end close to the steel pipe to the end away from the steel pipe.

[0016] In the optional technical solution of the above-mentioned fender bracket, on the cross-sectional surface of the fender bracket, there is an angle between the straight line formed by connecting the outer diameters of the connecting parts and the axis of the steel pipe, and the angle is not less than 30 degrees and not more than 60 degrees, wherein the axis of the steel pipe is located on the cross-sectional surface; and / or,

[0017] One end of the aluminum tube beam close to the connecting portion abuts against the connecting portion; and / or,

[0018] The steel base body is provided with four mounting points, and the four mounting points are symmetrically arranged on the steel base body.

[0019] In the optional technical solution of the above-mentioned fender bracket, the steel base body is provided with reinforcing ribs, and the reinforcing ribs connect two non-adjacent mounting points; and / or,

[0020] There is at least one reinforcing rib, and the extending direction of the reinforcing rib is parallel to the symmetry axis of the four mounting points.

[0021] The present application also provides a vehicle, the vehicle comprising a fender bracket according to any one of the above technical solutions, the vehicle further comprising a fender, and the fender bracket is used to support the fender.

[0022] Galvanizing the steel pipe before welding it to the aluminum tube beam can generate Fe(Zn Al) during the welding process. 10 , thereby enhancing the toughness, tensile strength and elongation of the welded joint, and thus reducing the possibility of stress cracking in the welded area. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] BRIEF DESCRIPTION OF THE DRAWINGS The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0024] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings, in which:

[0025] Figure 1 is a flow chart of the main steps of the method for preparing the fender bracket of the present application;

[0026] Figure 2 It is a flowchart of a specific implementation method of the method for preparing the fender bracket of the present application;

[0027] Figure 3 It is a schematic diagram of the connection between the steel base and the steel pipe of the fender bracket of the present application;

[0028] Figure 4 is a cross-sectional view of the fender bracket of the present application;

[0029] Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0030] List of reference numerals:

[0031] 1. Fender bracket; 11. Steel base; 111. Steel base body; 1110. Reinforcement rib; 1111. First reinforcement rib; 1112. Second reinforcement rib; 1113. Mounting point; 112. Connecting part; 1121. Straight line formed by the outer diameter of the connecting part at the cross section; 12. Steel pipe; 121. Axis of the steel pipe; 122. Annular groove; 13. Aluminum tube beam; α. Angle; 111a. Axis of symmetry of the four mounting points. DETAILED DESCRIPTION

[0032] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. "Multiple" or "several" means two or more.

[0033] Unless otherwise specified, the orientations or positional relationships indicated by “inside” and “outside” are based on the orientations or positional relationships shown in the drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] It should be noted that when an element is referred to as being "disposed on" or "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The term "connection" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0035] It should also be noted that the chemical symbols of iron, zinc and aluminum in the present application are Fe, Zn and Al, respectively. In order to facilitate the description of the intermetallic compounds formed between the three or two of them, the chemical symbols are used to represent the intermetallic compounds formed.

[0036] The present application provides a method for preparing a fender bracket 1. Figure 4 The fender bracket 1 is prepared by the preparation method of the present application. The raw materials for preparing the fender bracket 1 include an aluminum tube beam 13, a steel base 11 and a steel tube 12 fixedly arranged on the steel base 11. The outer surface of the steel tube 12 is provided with a galvanized layer. The aluminum tube beam 13 can be sleeved on the steel tube 12, and when the aluminum tube beam 13 is sleeved on the steel tube 12, the galvanized layer faces the aluminum tube beam 13, that is, the galvanized layer is located between the steel tube 12 and the aluminum tube beam 13.

[0037] like Figure 1 As shown, the following is a main step flow chart of the fender bracket 1, which specifically includes the following steps:

[0038] Step S100: sleeve the aluminum tube beam 13 outside the steel tube 12, and weld the steel tube 12 and the aluminum tube beam 13;

[0039] Step S200: Control the welding temperature within a preset temperature range so that an intermetallic compound Fe(ZnAl) is generated between the steel tube 12 and the aluminum tube beam 13. 10 ;

[0040] Step S300: Cooling the welded steel tube 12 and the aluminum tube beam 13.

[0041] When the steel tube 12 is not provided with a galvanized layer, the intermetallic compound formed by welding the steel tube 12 and the aluminum tube beam 13 is Fe2Al5. When the steel tube 12 is coated with a galvanized layer, the aluminum tube beam 13 is sleeved on the steel tube 12 on the steel base 11 and welded. The aluminum tube beam 13 and the steel tube 12 react to form an intermetallic compound Fe2Al5. When the temperature reaches the preset temperature range, the intermetallic compound formed between the aluminum tube beam 13 and the steel tube 12 is Fe(Zn Al). 10 phase, due to Fe(Zn Al) 10 The hardness is not weaker than Fe2Al5, and Fe(Zn Al) 10 The brittleness of Fe2Al5 is lower than that of Fe2Al5, so the mechanical properties of the welded joint between the galvanized steel tube 12 and the aluminum tube beam 13 are improved. When the fender bracket 1 is subjected to a tensile test, the tensile fracture position is in the heat-affected zone on the aluminum tube beam 13 side rather than in the steel-aluminum welded joint position. Therefore, when the fender bracket 1 manufactured by the above method is used to support the fender, the fender bracket 1 is less likely to fracture in the steel-aluminum welded area.

[0042] It should be noted that the material of the aluminum tube beam 13 in the present application is aluminum alloy. It should also be noted that since the aluminum tube beam 13 has a low melting point, it is easy to deform under the influence of high temperature during welding. Therefore, the aluminum tube beam 131 is placed outside the steel tube 12 instead of being located inside the steel tube 12. This can prevent the aluminum tube beam 13 from being deformed by high temperature and affecting the connection between the aluminum tube beam 13 and the steel tube 12.

[0043] In addition, the steel pipe 12 of the present application can be a round pipe, and of course can be a tapered pipe. Therefore, the round pipe or tapered steel pipe 12 is within the protection scope of the present application.

[0044] In one embodiment, the preset temperature range is not less than 460 degrees Celsius and not more than 530 degrees Celsius. When the preset temperature is lower than 460 degrees Celsius, it is difficult for iron and aluminum atoms to diffuse fully in the zinc layer and form an aluminum, iron, zinc intermetallic compound Fe(ZnAl). 10 phase, and it is difficult to ensure that the mechanical properties of the steel-aluminum welded joint can be improved. When the temperature is higher than 530℃, the thickness of the intermetallic compound will be too thick and microcracks will be easily generated. In addition, the temperature higher than 530℃ will cause the grains in the heat affected zone of the weld to grow abnormally, thus affecting the mechanical properties of the welded joint.

[0045] In one embodiment, if Figure 2 FIG. 1 is a flowchart of a specific implementation method of a method for preparing a fender bracket 1, which specifically includes the following steps:

[0046] Step S110: fix the steel base 11 and the steel tube 12, and control the axis of the aluminum tube beam 13 and the axis 121 of the steel tube 12 to be on the same straight line;

[0047] Step S120: Control the aluminum tube beam 13 to rotate around the axis and move along the straight line where the axis is located toward the steel tube 12, so that the aluminum tube beam 13 is rotatably sleeved on the steel tube 12 and is rotated and friction welded with the steel tube 12;

[0048] Step S200: Control the welding temperature within a preset temperature range so that the steel tube 12 and the aluminum tube beam 13 form an intermetallic compound Fe(ZnAl) 10 ;

[0049] Step S300: Cooling the welded steel tube 12 and the aluminum tube beam 13.

[0050] At this time, the steel tube 12 and the aluminum tube beam 13 are welded by rotational friction, the steel base 11 and the steel tube 12 are controlled to be fixed, and the axis of the aluminum tube beam 13 and the axis 121 of the steel tube 12 are set on the same straight line. The aluminum tube beam 13 continuously rotates around its own axis and moves along the axis toward the steel tube 12 until the aluminum tube beam 13 and the steel tube 12 are welded by rotational friction. At this time, since the temperature rises during the rotational friction process, the faster the rotation speed of the aluminum tube beam 13, the higher the temperature generated during the friction process. By controlling the rotation speed of the aluminum tube beam 13, the welding temperature can be controlled to reach a preset temperature range.

[0051] The galvanized steel pipe 12 and the aluminum tube beam 13 are welded as follows. First, a 20um zinc layer is plated on the steel pipe 12 by electroplating. The welding process includes: fixing the steel base 11 on the 100-ton inertia welding equipment through the tooling, installing the aluminum tube beam 13 on the other side of the equipment, ensuring that the axis of the aluminum tube beam 13 is in the same straight line with the axis 121 of the steel pipe 12, starting the equipment, so that the aluminum tube beam 13 rotates rapidly and approaches the steel pipe 12, and the equipment applies a force toward the steel pipe 12 to the aluminum tube beam 13, and adjusts the rotation speed of the aluminum tube beam 13 according to the force applied to the aluminum tube beam 13 until the steel-aluminum welding surface reaches the maximum temperature of 510°C due to friction. At this time, the thickness of the intermetallic compounds at the zinc-aluminum interface and the zinc-iron interface are both 10μm. After that, the welding is completed, and the welded steel pipe 12 and the aluminum tube beam 13 are cooled to room temperature. After testing, it was found that before the steel pipe 12 was galvanized, the aluminum tube beam 13 was welded to the steel pipe 12, and the tensile strength of the welded joint between the steel pipe 12 and the aluminum tube beam 13 was 160MPa, and the elongation was 0.5%. After the steel pipe 12 was galvanized, the aluminum tube beam 13 was welded to the steel pipe 12, and the tensile strength of the welded joint was 210MPa, and the elongation was 7%. After the steel pipe 12 was galvanized, the tensile strength and elongation of the welded joint between the steel pipe 12 and the aluminum tube beam 13 were significantly improved, and the mechanical properties of the welded joint were significantly improved. Therefore, the manufactured fender bracket 1 is less likely to break at the steel-aluminum welding position.

[0052] It should be noted that when controlling the movement of the aluminum tube beam 13 toward the steel tube 12, it is necessary to apply a force along the axial direction and pointing to the direction of the steel tube 12 to the aluminum tube beam 13. When the rotation speed of the aluminum tube beam 13 is constant, the welding temperature during the rotational friction process can also be increased by increasing the force applied to the aluminum tube beam 13. When the force applied to the aluminum tube beam 13 is constant, the welding temperature during the rotational friction process can also be increased by increasing the rotation speed of the aluminum tube beam 13. Of course, the welding temperature can also be increased by other means, such as increasing the welding temperature by electric heating during the rotational friction welding process. Therefore, the above-mentioned method of increasing the welding temperature to the preset temperature range is not restrictive, and the corresponding method can be selected to control the welding temperature according to the needs of technical personnel in this field.

[0053] It should also be noted that the welding method of the steel tube 12 and the aluminum tube beam 13 is not restrictive, and can be rotary friction welding or fusion welding. For example, Zn welding wire is used for steel-aluminum fusion brazing. As long as the Fe(ZnAl) 10 The welding method can be set according to the needs of technical personnel in this field, and all of the above are within the protection scope of this application.

[0054] In one embodiment, the thickness of the galvanized layer is not less than 15um and not more than 25um. When the steel tube 12 and the aluminum tube beam 13 are friction welded, a portion of the galvanized layer will be worn away during the friction process. Therefore, the thickness of the galvanized layer needs to be not less than 15um to ensure that the galvanized layer is not completely worn away, thereby ensuring that the iron atoms and aluminum atoms can be dissolved in the zinc layer at a preset temperature to generate Fe(ZnAl). 10 Phase, thereby ensuring the mechanical properties of the welded joint of the steel pipe 12 and the aluminum tube beam 13. When the thickness of the galvanized layer exceeds 25um, it will increase the cost and increase the difficulty of plating the zinc layer on the steel pipe 12. Therefore, the thickness of the galvanized layer is not less than 15um and not more than 25um, which can save costs and reduce the difficulty of plating the zinc layer on the steel pipe 12. At the same time, it can also ensure that during the welding process, when the preset temperature range is reached, Fe(ZnAl) can be formed between the steel pipe 12 and the aluminum tube beam 13. 10 Moreover, it can ensure that the thickness of the intermetallic compounds at the zinc-aluminum interface and the zinc-iron interface is 5-12μm.

[0055] The present application also provides a fender bracket 1, which is prepared by the preparation method of the fender bracket 1 in any of the above-mentioned embodiments. The fender bracket 1 includes a steel base 11, a steel pipe 12 arranged on the steel base 11, and an aluminum tube beam 13 sleeved and welded on the steel pipe 12.

[0056] In one embodiment, if Figure 5As shown, the outer wall of the steel tube 12 is provided with a plurality of annular grooves 122, which are arranged along the axis 121 of the steel tube 12, and the annular grooves 122 are arranged facing the aluminum tube beam 13, and the annular grooves 122 are used to receive the molten aluminum alloy formed during the welding process of the steel tube 12 and the aluminum tube beam 13. During the welding process of the steel tube 12 and the aluminum tube beam 13, the aluminum alloy is easily softened and becomes a flowing state due to the high temperature, and the flowing aluminum alloy flows between the steel tube 12 and the aluminum tube beam 13, which easily affects the welding process, and the setting of the annular grooves 122 can accommodate the flowing aluminum alloy. When the welding is completed and cooled, the aluminum alloy in the annular grooves 122 can also better mechanically connect the aluminum tube beam 13 and the steel tube 12, thereby further improving the mechanical properties and mechanical strength of the welded joint.

[0057] In one embodiment, if Figure 3 , Figure 5 As shown, the steel base 11 includes a steel base body 111 and a connecting portion 112 fixedly arranged on the steel base body 111. The connecting portion 112 is annular, and one end of the connecting portion 112 away from the steel base body 111 is connected to the steel pipe 12. The connecting portion 112 has the same inner diameter as the steel pipe 12, and the outer diameter of the connecting portion 112 gradually increases from the end close to the steel pipe 12 to the end away from the steel pipe 12. Since the inner diameter of the connecting portion 112 is the same as the inner diameter of the steel pipe 12, the thickness of the connecting portion 112 increases continuously from the end connected to the steel pipe 12 to the end connected to the steel base body 111. The above arrangement can reduce the possibility of fracture due to stress concentration at the connection position between the connecting portion 112 and the steel pipe 12.

[0058] In one embodiment, if Figure 4 , Figure 5 As shown, one end of the aluminum tube beam 13 close to the connecting portion 112 abuts against the connecting portion 112. Therefore, during the welding process, the aluminum tube beam 13 can be limited by the connecting portion 112 after abutting against the connecting portion 112, thereby ensuring that the aluminum tube beam 13 will no longer continue to move along the movement direction of the steel tube 12 after moving into position, thereby ensuring the accuracy of the connection position between the aluminum tube beam 13 and the steel tube 12.

[0059] In one embodiment, the fender bracket 1 is cut through a plane where the axis 121 of the steel pipe 12 is located, and an angle α is formed between a straight line formed by the outer diameter of the connecting portion 112 on the cut surface and the axis 121 of the steel pipe 12, and the angle α is not less than 30 degrees and not more than 60 degrees. When the angle α is within the range of not less than 30 degrees and not more than 60 degrees, it is easier to avoid the connection position of the connecting portion 112 and the steel pipe 12 from being broken due to stress concentration after being stressed.

[0060] In one embodiment, if Figure 3As shown, the steel base body 111 is provided with four mounting points 1113, and the four mounting points 1113 are symmetrically arranged on the steel base body 111. The fender bracket 1 is mainly installed on the vehicle to support the fender of the vehicle. The steel base 11 is provided with four mounting points 1113, and the four mounting points 1113 can improve the supporting effect on the fender. In addition, the symmetrical arrangement of the four mounting points 1113 can make the forces of each mounting point 1113 as even as possible, or make the forces of the mounting points 1113 at symmetrical positions as equal as possible, so as to avoid the problem that the fender bracket 1 is detached from the vehicle due to abnormal force on a certain mounting point 1113 of the fender bracket 1.

[0061] In one embodiment, if Figure 3 As shown, a reinforcing rib 1110 is provided on the steel base body 111, and the reinforcing rib 1110 connects two non-adjacent mounting points 1113. The reinforcing rib 1110 connecting two non-adjacent mounting points 1113 is called a first reinforcing rib 1111. Since the two mounting points 1113 connected by the first reinforcing rib 1111 are located on both sides of the symmetry axis 111a of the four mounting points 1113, when the mounting point 1113 on one side of the first reinforcing rib 1111 is subjected to abnormal force, the force can be guided to the mounting point 1113 at the other end of the first reinforcing rib 1111 through the reinforcing rib 1110, thereby avoiding the problem that a certain mounting point 1113 on the fender bracket 1 or even the entire fender bracket 1 is detached from the vehicle due to uneven force or improper installation of the steel base body 111.

[0062] In one embodiment, there is at least one reinforcing rib 1110, such as Figure 3 As shown, the extension direction of the reinforcing rib 1110 is parallel to the symmetry axis 111a of the four mounting points 1113. The reinforcing rib 1110 is the second reinforcing rib 1112. The second reinforcing rib 1112 is provided to further enhance the supporting function of the steel base 11. When the fender bracket 1 is provided on the vehicle, the fender bracket 1 mainly bears the z-direction vibration load applied by the vehicle and the fender. When the vehicle is placed on the ground, the z-direction is perpendicular to the ground, and the symmetry axis 111a of the four mounting points 1113 extends along the z-direction. The second reinforcing rib 1112 is parallel to the symmetry axis 111a of the four mounting points 1113, which means that the second reinforcing rib 1112 extends along the z-direction. At this time, the second reinforcing rib 1112 provided in the z-direction can improve the ability of the fender bracket 1 to bear the z-direction vibration load. Thus, the supporting function of the fender bracket 1 on the fender is further enhanced.

[0063] In addition, the present application also provides a vehicle, which has the fender bracket 1 described in any of the above embodiments, and the vehicle also includes a fender, and the fender bracket 1 is used to support the fender.

[0064] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A method for preparing a fender bracket, characterized in that: The fender bracket is formed by an aluminum tube beam, a steel base and a steel tube fixed to the steel base, the outer surface of the steel tube is provided with a galvanized layer, the aluminum tube beam can be sleeved on the steel tube, and the galvanized layer faces the aluminum tube beam, and the preparation method includes: The aluminum tube beam is sleeved outside the steel tube, and the steel tube and the aluminum tube beam are welded; The welding temperature is controlled within a preset temperature range so that an intermetallic compound Fe(ZnAl) is generated between the steel tube and the aluminum tube beam. 10 ; The welded steel pipe and the aluminum tube beam are cooled.

2. The method for preparing a fender bracket according to claim 1, characterized in that: The preset temperature range is not less than 460 degrees Celsius and not more than 530 degrees Celsius.

3. The method for preparing a fender bracket according to claim 2, characterized in that: "Sleeving the aluminum tube beam outside the steel tube, and welding the steel tube and the aluminum tube beam" specifically includes the following steps: Fix the steel base and the steel pipe disposed on the steel base, and control the axis of the aluminum tube beam and the axis of the steel pipe to be located on the same straight line; The aluminum tube beam is controlled to rotate around the axis and move along the straight line where the axis is located toward the steel tube, so that the aluminum tube beam is rotatably sleeved on the steel tube and is rotated and friction welded with the steel tube.

4. The method for preparing a fender bracket according to any one of claims 1 to 3, characterized in that: The thickness of the zinc coating is not less than 15um and not more than 25um.

5. A fender bracket, characterized in that: The fender bracket is prepared by the method for preparing the fender bracket described in any one of claims 1 to 4, and the fender bracket includes a steel base, a steel pipe fixed to the steel base, and an aluminum tube beam sleeved and welded to the steel pipe.

6. The fender bracket according to claim 5, characterized in that: The outer wall of the steel pipe is provided with a plurality of annular grooves, which are arranged along the axial direction of the steel pipe and facing the aluminum tube beam. The annular grooves are used to receive the molten or softened flowing aluminum alloy formed during the welding process between the steel pipe and the aluminum tube beam.

7. The fender bracket according to claim 5, characterized in that: The steel base includes a steel base body and a connecting part fixedly arranged on the steel base body, the connecting part is annular, and the end of the connecting part away from the steel base body is fixedly connected to the steel pipe. The connecting part has the same inner diameter as the steel pipe, and the outer diameter of the connecting part gradually increases from the end close to the steel pipe to the end away from the steel pipe.

8. The fender bracket according to claim 7, characterized in that: On the cross-sectional surface of the fender bracket, there is an angle between a straight line formed by connecting the outer diameters of the connecting portion and the axis of the steel pipe, and the angle is not less than 30 degrees and not more than 60 degrees, wherein the axis of the steel pipe is located on the cross-sectional surface; and / or, One end of the aluminum tube beam close to the connecting portion abuts against the connecting portion; and / or, The steel base body is provided with four mounting points, and the four mounting points are symmetrically arranged on the steel base body.

9. The fender bracket according to claim 8, characterized in that: The steel base body is provided with reinforcing ribs, and the reinforcing ribs connect two non-adjacent mounting points; and / or, There is at least one reinforcing rib, and the extending direction of the reinforcing rib is parallel to the symmetry axis of the four mounting points.

10. A vehicle, characterized in that: The vehicle comprises the fender bracket according to any one of claims 5 to 9, and the vehicle further comprises a fender, wherein the fender bracket is used to support the fender.

Images