WO2023088334A1

WO2023088334A1 - Welded structural part and forming method therefor, and electronic device

Info

Publication number: WO2023088334A1
Application number: PCT/CN2022/132408
Authority: WO
Inventors: 纪大伟; 蔡明�; 黄学龙
Original assignee: 华为技术有限公司
Priority date: 2021-11-19
Filing date: 2022-11-17
Publication date: 2023-05-25
Also published as: CN116140757A

Abstract

A welded structural part (100) and a forming method therefor, and an electronic device. The welded structural part (100) comprises a first structural part (10) and a second structural part (20); a through hole (13) is formed in the first structural part (10); the through hole (13) comprises a first opening (131) and a second opening (132); and the second structural part (20) at least partially penetrates through the through hole (13). The welded structural part (100) further comprises: a first welding portion (30) welded to the first structural part (10) and the second structural part (20), the material of the first welding portion (30) being approximately the same as that of the second structural part (20), and the first welding portion (30) being at least partially located in a first recessed area (11); and/or a second welding portion (40) welded to the first structural part (10) and the second structural part (20), the material of the second welding portion (40) being approximately the same as that of the first structural part (10), and the second welding portion (40) being at least partially located in a second recessed area (23).

Description

A welded structural part, its forming method, and electronic device

This application claims the priority of the Chinese patent application with the application number 202111376071.8 and the application title "A Welded Structural Part and Its Forming Method, and Electronic Equipment" filed with the China Patent Office on November 19, 2021, the entire contents of which are incorporated by reference incorporated in this application.

【Technical field】

The present application relates to the technical field of electronic equipment, in particular to a welded structural part, its forming method, and electronic equipment.

【Background technique】

Due to their high mechanical strength and light weight, titanium and titanium alloys are widely used in aviation, aerospace, deep diving, chemical and other fields, and are also increasingly used in wearable devices, mobile phones and other fields. However, titanium alloys are not as wear resistant as steel. At present, some structural parts of electronic products need to have both weight reduction, high mechanical strength and wear resistance. Generally, titanium or titanium alloys and steel are used to prepare the structural parts together to make them both weight reduction and wear resistance performance.

Due to the large difference in thermal expansion coefficient and thermal conductivity between titanium and steel, welding heating and cooling lead to large internal stress at the joint. Secondly, steel is easy to precipitate in the weld to form a large number of intermetallic compounds. These intermetallic compounds are brittle TiFe and TiFe ₂ phases, which endanger the quality of the welded joint and cause the weldment to be easily broken by external forces, making the connection strength of the structural part decline.

【Application content】

The purpose of this application is to provide a welded structural part, its forming method, and electronic equipment, which can effectively improve the welding stability of dissimilar metals and improve the connection strength of the structural part.

In a first aspect, the present application provides a welded structural part, the welded structural part includes a first structural part and a second structural part, and the materials of the first structural part and the second structural part are different;

The first structural member is provided with a through hole, and the through hole includes a first opening and a second opening; at least part of the second structural member passes through the through hole;

The welded structure also includes:

A first welding portion welded to the first structural member and the second structural member; wherein, the first structural member is provided with a first recessed area, and the first recessed area includes a third opening and a first Four openings, the fourth opening communicates with the first opening; the first welding part is made of the same material as the second structural member, and at least part of the first welding part is located in the first recessed area within; and/or,

The second welding part welded to the first structural member and the second structural member; wherein, the second structural member is also provided with an inclined structure, and the inclined structure is formed in cooperation with the first structural member The second recessed area; the second welding portion is made of the same material as the first structural member; at least part of the second welding portion is located in the second recessed area.

It should be noted that the same material main body of the first structural member and the second structural member means that the elements that account for more than 50% of the mass in the two materials are the same. Preferably, the same material main body means that the mass of the two materials is the same. The elements accounting for more than 80% are the same. More preferably, the materials of the first structural member and the second structural member are completely the same, that is, the mass content of each element in the two materials is the same. For example, the mass proportion of titanium metal in titanium metal is more than 90%, and the mass proportion of titanium metal in titanium alloy is more than 50%, that is to say, titanium metal and titanium alloy are two materials with the same main body.

In the above scheme, the weld seam between the second structural member and the second welding part is a welding interface formed by welding of the same material, the metal fusion welding strength is high, and it is not easy to form intermetallic compounds; and the first structural member is provided with The recessed area can effectively prevent the second structural part from protruding from the through hole, and can improve the mechanical strength of the welded structural part. The welded structural parts of the solution can effectively improve the welding stability of dissimilar metals and improve the connection strength of the structural parts.

In some embodiments, at least part of the second structural member protrudes to form a protruding portion in the first recessed area relative to the first structural member before welding with the first structural member, and the first welding The portion is formed by fusion welding of the protruding portion.

In the above solution, during the welding process, the second structural member is fused and welded to form the first welded part. Since the first welded part is formed by melting and cooling the protruding part of the second structural member, it is the same material. It is not easy to form intermetallic compounds during the welding process, and the overall structural stability is stronger. The first welding portion is accommodated in the first recessed area, so that the engaging process and the welding process can be integrated, and the welding stability of dissimilar metals can be further improved, and the connection strength of the structural parts can be further improved.

In some embodiments, a transition layer is provided on the side wall surface of the first structural member close to the first recessed area, and the first welding part is welded to the first structural member through the transition layer.

In the above solution, welding two metals of different materials through the transition layer can reduce the generation of intermetallic compounds during the welding process and improve the mechanical strength of the welded structural parts.

In some embodiments, the first welding portion cooperates with the first recessed area.

In the above solution, the first welding part cooperates with the first recessed area, which can make the overall structure more compact and tidy, and the first welding part will not protrude relative to the first structural component, and will not affect the arrangement of other components.

In some embodiments, a transition layer is provided on the surface of the inclined structure, and the second welding part is connected to the inclined structure through the transition layer.

In the above solution, the transition layer welding between the second welding portion and the inclined structure can also reduce the generation of intermetallic compounds during the welding process and improve the mechanical strength of the welded structural member.

In some embodiments, the second welding portion cooperates with the second recessed area.

In the above solution, the second welding part cooperates with the second recessed area, which can make the overall structure more compact and tidy, and the second welding part will not protrude relative to the first structural part, and will not affect the arrangement of other components.

In some embodiments, the through hole is a stepped hole, and the through hole includes a first channel and a second channel connected to each other, the diameter of the first channel is smaller than the diameter of the second channel; the second channel The structural component includes a main body and locking parts extending from two sides of the main body, the main body passes through the first hole, and the locking part is locked in the second hole.

In the above solution, the engaging portion of the second structural member can be engaged in the second channel of the first structural member, which can improve the mechanical strength of the welded structural member and improve the connection strength of the structural member.

In some embodiments, the second welding portion is connected to the engaging portion of the second structural member on a side away from the second opening.

In some embodiments, a part of the second welding portion is fusion-welded with the first structural component, and a transition layer is used to weld a portion of the second welding portion to the engaging portion of the second structural component.

In the above scheme, the material of the second welding part is the same as the main material of the first structural part, such as titanium or titanium alloy, and then through the spot welding process, the second welding part is partially melted, so that the inclined structure can be closed with the The second recessed area formed by the cooperation of the first structural member, and welded through the second welding part of the same material as the first structural member, can also avoid the formation of intermetallic compounds, and can also prevent the second structural member from passing through the through hole. Internal protruding improves overall stability.

In some embodiments, the material of the first structural member and the second welding part is selected from at least one of titanium metal, titanium alloy, aluminum alloy, magnesium alloy and carbon fiber; the second structural member and the The material of the first welding portion is selected from at least one of carbon steel, stainless steel, cobalt alloy, and nickel alloy.

In some embodiments, the material of the transition layer is selected from at least one of copper, nickel, zinc, silver, and chromium.

In some embodiments, the transition layer has a thickness of 10 μm˜100 μm.

In a second aspect, the present application provides a method for forming a welded structure, comprising the following steps:

A first structural member and a second structural member are provided, the materials of the first structural member and the second structural member are different; wherein, the first structural member is provided with a through hole, and the through hole includes a first opening and second opening

passing at least part of the second structural member through the through hole;

Welding the first structural member and the second structural member by the following method A and/or method B;

Said method A comprises:

A first welding portion is formed in the first recessed area on the first structural member to realize the welding of the first structural member and the second structural member, wherein the first recessed area includes a third opening and A fourth opening, the fourth opening communicates with the first opening; the first welding part is made of the same material as the second structural member;

Said method B comprises:

A second welding portion is formed in the second recessed area to realize the welding of the first structural member and the second structural member, wherein the second structural member is provided with an inclined structure, and the inclined structure is connected to the second structural member. The first structural component cooperates to form the second recessed area; the second welding portion is made of the same material as the first structural component.

In the above solution, the first structural part and the second structural part of different materials are welded and connected through the welding part, and the welding between dissimilar metals is converted into welding between the same metals, which can effectively improve the welding stability of dissimilar metals and improve The connection strength of structural members.

In some embodiments, at least part of the second structural member in the welded structural member protrudes to form a protrusion relative to the first recessed area of the first structural member before welding with the first structural member Part, the forming a first welding portion in the first recessed area on the first structural member includes:

The protruding portion is melted to form the first weld.

In some embodiments, the formation of the first welding portion in the first recessed area on the first structural member to realize the welding of the first structural member and the second structural member includes:

forming a transition layer on the sidewall of the first structural member located in the first recessed region;

Fusion welding the end of the second structural member close to the first recessed area to form the first welded portion, and welding the first welded portion to the first structural member through the transition layer. In some embodiments, the first welding portion cooperates with the first recessed area.

In some embodiments, the through hole is a stepped hole, and the through hole includes a first channel and a second channel connected to each other, and the aperture of the first channel is smaller than the aperture of the second channel; Before the first welding part is welded to the first structural member and the second structural member, the method further includes:

Processing the second structural member, so that the second structural member includes a main body and engaging portions extending from both sides of the main body;

The main body of the second structure is passed through the first hole of the first structure, and the engaging portion is locked in the second hole.

In some embodiments, the formation of the second welding portion in the second recessed area to realize the welding of the first structural member and the second structural member includes:

An inclined structure is formed on a side of the engaging portion of the second structural member close to the second opening, and a transition layer is formed on the inclined structure;

Fusion welding the second welding portion to the first structural component, and welding the second welding portion to the second structural component through the transition layer.

In a third aspect, the present application provides a welded structural part, which is formed by the method described in the second aspect above.

In a fourth aspect, the present application provides an electronic device, including the welding structure according to the above first aspect or the welding structure according to the above third aspect. Wherein, the electronic device is a foldable electronic device, and the foldable electronic device includes a rotating shaft assembly, and the welding structure is located in the rotating shaft assembly.

Compared with the prior art, the present application has at least the following beneficial effects:

The welded structural parts and electronic equipment provided by this application convert the welding between dissimilar metals into the same metal welding between the structural parts of different materials, and the fusion welding strength of the same metals is high, and it is not easy to form intermetallic compounds. Effectively improve the welding stability of dissimilar metals and improve the connection strength of structural parts.

【Description of drawings】

Fig. 1a is a schematic structural diagram of welding between dissimilar metals in the prior art.

Fig. 1b is another structural schematic diagram of welding between dissimilar metals in the prior art.

Fig. 2 is a perspective view before welding of a welded structural part provided by the embodiment of the present application.

Fig. 3a is a schematic cross-sectional view of a first structural member provided by an embodiment of the present application.

Fig. 3b is a schematic cross-sectional view of the second structural member provided by the embodiment of the present application.

Fig. 4a is a schematic structural diagram of a first structural member provided in an embodiment of the present application.

Figure 4b is another structural schematic diagram of the first structural member provided by the embodiment of the present application

Fig. 4c is another structural schematic diagram of the first structural member provided by the embodiment of the present application.

Fig. 4d is another structural schematic diagram of the first structural member provided by the embodiment of the present application.

Fig. 5a is a schematic structural diagram of a first structural member provided in an embodiment of the present application.

Fig. 5b is another structural schematic diagram of the first structural member provided by the embodiment of the present application.

Fig. 5c is another structural schematic diagram of the first structural member provided by the embodiment of the present application.

Fig. 6a is a schematic cross-sectional view of the welded structural member provided by the embodiment of the present application before welding.

Fig. 6b is a schematic cross-sectional view of the welded structural member provided in the embodiment of the present application after welding.

Fig. 6c is a partially enlarged view of area A shown in Fig. 6b.

Fig. 7 is a perspective view of another welded structural member provided by the embodiment of the present application.

Fig. 8a is another schematic cross-sectional view of the first structural member provided by the embodiment of the present application.

Fig. 8b is a schematic cross-sectional view of the second structural member provided by the embodiment of the present application.

Fig. 8c is a schematic cross-sectional view of the welded structural member provided by the embodiment of the present application before welding.

Fig. 8d is a schematic cross-sectional view of the welded structural member provided by the embodiment of the present application after welding.

Fig. 8e is a partially enlarged view of area B shown in Fig. 8d.

Fig. 9 is a schematic cross-sectional view of another welded structural member provided in the embodiment of the present application before welding.

FIG. 10 is a schematic cross-sectional view of a welded structural member provided in an embodiment of the present application after welding.

FIG. 11 is a schematic cross-sectional view of another welded structure provided in an embodiment of the present application in an exploded state after welding.

Fig. 12a is a schematic cross-sectional view of the welded structural member provided by the embodiment of the present application before welding.

Fig. 12b is a schematic cross-sectional view of the welded structural member provided by the embodiment of the present application after welding.

Fig. 13a is a schematic cross-sectional view of another welded structural member provided in an embodiment of the present application before welding.

Fig. 13b is a schematic cross-sectional view of another welded structural member provided in the embodiment of the present application after welding.

Fig. 13c is a partially enlarged view of the area C shown in Fig. 13b.

FIG. 14 is a schematic structural diagram of a rotating shaft assembly in an electronic device according to an embodiment of the present application.

【Detailed ways】

It should be clear that the described embodiments are only some of the embodiments of the present application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

In describing the embodiments of the present application, it should be understood that the terms "length", "thickness", "upper", "lower", "front", "rear", "left", "right", "top ", "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the implementation of the application and simplifying the description, rather than indicating or It should not be construed to limit the embodiments of the application by implying that a referenced device or element must have a particular orientation, be constructed, and operate in a particular orientation. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the embodiments of the present application, "plurality" means two or more, unless otherwise specifically defined.

In the description of the embodiments of the present application, it should be noted that unless otherwise specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral Connection; it can be mechanical connection, electrical connection or mutual communication; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present application according to specific situations.

Due to their high mechanical strength and light weight, the existing titanium and titanium alloys are widely used in aviation, aerospace, deep diving, chemical industry and other fields, and are also more and more used in wearable devices, mobile phones and other fields. However, titanium alloys are not as wear resistant as steel. At present, some structural parts of electronic products need to combine weight reduction, high mechanical strength and wear resistance. The structural part is jointly prepared by using titanium or titanium alloy and steel, so that it has both weight reduction and wear resistance.

Fig. 1a is a schematic diagram of the structure of welding between dissimilar metals in the prior art. As shown in Fig. 1a, pre-drilling can be carried out at the overlap between the aluminum plate 4 and the steel plate 2 to be connected to obtain a pre-drilled hole 31, and then the rivet 3 can be penetrated. into the pre-drilled hole 31, so that the end face of the cap of the rivet 3 is flush with the surface of the aluminum plate 4, and the other end of the rivet is higher than the surface of the steel plate 2; finally, use a rotating needleless stirring head 1 to carry out the first rivets higher than the surface of the steel plate 2 Press down so that the end face of the needleless stirring head 1 is in contact with the surface of the steel plate 2; then continue the second press down and then perform friction welding. However, this welding structure requires a rotating stirring head for friction welding, which is only suitable for plate welding of large flat structures, not for blind hole structures.

At present, when titanium or titanium alloy and steel are preparing the same structure, as shown in Figure 1b, generally copper, niobium, tantalum are arranged between a part of the structure 10' made of titanium (titanium alloy) and another part of the structure 20' made of steel. Weld the transition layer 11' to improve the quality of the titanium steel welded joint. However, this method of welding the transition layer has low weld strength and unstable welding.

In order to improve the welding stability of dissimilar metals, Fig. 2 is a perspective view before welding of a welded structural part provided by the embodiment of the present application. As shown in Fig. 2, the welded structural part 100 includes a first structural part 10 and a second For the structural member 20 , the materials of the first structural member 10 and the second structural member 20 are different.

In some embodiments, the material of the first structural member 10 is selected from at least one of titanium metal, titanium alloy, aluminum alloy, magnesium alloy and carbon fiber, and the material of the second structural member 20 is selected from carbon steel, stainless steel, cobalt Alloy, nickel alloy at least one. The specific preparation process may be die-casting, machining, powder metallurgy, etc., which is not limited here. The first structural member 10 may be in the shape of a cuboid or other irregular three-dimensional structures, which is not limited here. The second structural member 20 may be columnar, rod-shaped, shaft-shaped or other irregular three-dimensional structures. Exemplarily, by welding the first structural member 10 made of titanium and the second structural member 20 made of steel, the welded structural member can have both the wear resistance of steel and the low density of titanium or titanium alloy , High mechanical strength.

Due to the large difference in thermal expansion coefficient and thermal conductivity between titanium and steel, heating and cooling during welding will lead to large internal stress. Moreover, during the welding process, the content of iron in the steel in the weld greatly exceeds the solubility, and a large amount of intermetallic compounds, such as TiFe and TiFe ₂ , are easily precipitated, which leads to the fracture of the welded structural parts under the action of external force and poor welding stability.

Figure 3a is a schematic cross-sectional view of the first structural member provided by the embodiment of the present application. As shown in Figure 3a, the first structural member 10 is provided with a through hole 13, and the through hole 13 includes a first opening 131 and a second opening 132, at least partially The second structural member 20 passes through the through hole 13 .

The first structural member 10 is further provided with a first recessed area 11 , the first recessed area 11 includes a third opening 111 and a fourth opening 112 , and the fourth opening 112 communicates with the first opening 131 .

Specifically, the first structural member 10 includes a first surface 101 and a second surface 102 oppositely disposed; in some embodiments, the first surface 101 and the second surface 102 may be flat surfaces. In other embodiments, the first surface 101 and the second surface 102 may also be surfaces with a certain radian or slope, which is not limited here. In this application, the scheme is introduced with the first surface 101 and the second surface 102 as planes, but this scheme is not limited. The material of the first structural member 10 is titanium or titanium alloy, and the titanium alloy can be a dual-phase alloy, which has good structural stability, good toughness, plasticity and high temperature deformation performance, and can be processed by hot pressure well. Specifically, the titanium alloy may be a titanium aluminum vanadium alloy (Ti-6Al-4V, TC4) or a TA2 titanium alloy. The first surface 101 of the first structure member 10 is recessed to form a first recessed area 11 .

The through holes 13 may be circular openings, square openings or other regular or irregular shapes, which are not limited here. In a specific embodiment, as shown in FIG. 3a, the through hole 13 may be a stepped hole, and the through hole 13 includes a first channel 13a and a second channel 13b connected to each other, and the diameter of the first channel 13a is smaller than that of the first channel 13a. The diameter of the second channel 13b. A stepped hole is formed on the first structural member 10, and the snap connection between the first structural member and the second structural member can be realized through the stepped hole, which is beneficial to improve the connection strength of the overall structure.

Figure 3b is a schematic cross-sectional view of the second structural member provided by the embodiment of the present application. As shown in Figure 3b, the second structural member 20 includes a main body 21 and engaging parts 22 extending from both sides of the main body 21, at least Part of the main body portion 21 passes through the through hole 13 . Specifically, the main body portion 21 passes through the first hole 13a, and the engaging portion 22 is locked in the second hole 13b. Wherein, the main body portion 21 may be cylindrical, prismatic or other columnar structures, which are not limited here. In this embodiment, the main body 21 is cylindrical, and the diameter of the main body 21 of the second structural member 20 is 0.6mm˜2.0mm. The material of the second structural member 20 is stainless steel, which has strong wear resistance.

Fig. 4a is a schematic structural view of the first structural member provided by the embodiment of the present application, and the first recessed area 11 may be a C-shaped groove. Fig. 4b is another structural schematic diagram of the first structural member provided by the embodiment of the present application. As shown in Fig. 4b, the cross section of the first recessed area 11 can be rectangular, for example, the first recessed area 11 can be a rectangular groove, a cylinder Groove; FIG. 4c is another structural schematic diagram of the first structural member provided by the embodiment of the present application. As shown in FIG. 4c, the first recessed area 11 may be an arc-shaped groove. Fig. 4d is another structural schematic diagram of the first structural member provided by the embodiment of the present application. As shown in Fig. 4d, the first recessed area 11 may also be a composite structure of the above-mentioned several shapes, which is not limited here.

Figures 5a to 5b are schematic diagrams of another structure of the first structural member provided by the embodiment of the present application. As shown in Figure 5a, the through hole 13 may be a stepped hole, and its specific structure may be as shown in Figures 5a to 5b. The hole wall of the through hole 13 can be an inclined plane, a vertical plane, or an arc, etc. Fig. 5c is another structural schematic diagram of the first structural member provided by the embodiment of the present application. The through hole 13 may also be formed by connecting three or more channels with different diameters, which is not limited here.

Figure 6a is a schematic cross-sectional view of the welded structure provided by the embodiment of the application before welding, and Figure 6b is a schematic cross-sectional view of the welded structure provided by the embodiment of the application after welding; as shown in Figures 6a and 6b, the welded structure Also includes a first welding portion 30, the first welding portion 30 is welded to the first structural member 10 and the second structural member 20, and the first welding portion 30 is connected to the second structural member 20 The main materials are the same, and at least part of the first welding portion 30 is located in the first recessed area 11 . The first welding part 30 can be used to prevent the second structural part 20 from protruding from the through hole 13. The material body of the first welding part 30 is the same as that of the second structural part 20, and can be welded by a fusion welding process. forming.

It should be noted that the same material main body of the first structural member and the second structural member means that the elements that account for more than 50% of the mass in the two materials are the same. Preferably, the same material main body means that the mass of the two materials is the same. Elements accounting for more than 80% are the same. More preferably, the materials of the first structural member and the second structural member are completely the same, that is, the mass content of each element in the two materials is the same. For example, the mass proportion of titanium metal in titanium metal is more than 90%, and the mass proportion of titanium metal in titanium alloy is more than 50%, that is to say, titanium metal and titanium alloy are two materials with the same main body.

In some specific embodiments, at least part of the second structural member 20 protrudes relative to the first recessed area 11 of the first structural member 10 before welding with the first structural member 10 to form a protruding portion 21a . Specifically, the protruding portion 21 a may be formed by extending the main body portion 21 of the second structural member 20 . As shown in FIG. 6b, during the welding process, one end of the second structural member 20 located in the first recessed area 11 (which may be the protruding part 21a) is fused and welded to form a liquid metal or a liquid alloy and fill it into the first recessed area 11, The first welded portion 30 is formed. In this embodiment, the first welding part 30 is connected to the second structural member 20 to form a riveted structure. Since the first welding part 30 is formed by melting and cooling a part of the second structural member 20, it is the same material. During the welding process It is not easy to form intermetallic compounds, and the overall structural stability is stronger. In the actual welding process, the first surface 101 of the first structural member 10 can be flattened by a protective atmosphere (such as nitrogen, argon) to form a smooth riveting structure. In other embodiments, the first welding portion 30 may also protrude from the second surface 102 of the first structural member 10 , which is not limited here.

In other embodiments, it is also possible to directly use the same solder as the material body of the second structural member for welding, so that the solder is melted and welded with the second structural member 20 and filled into the first recessed area 11 to form the first weld. Section 30. Since the first welding portion 30 is made of the same material as the second structural member 20 , the connection structure between the two is stable.

In order to improve welding stability, the first welding portion 30 is welded to the second structural member 20 through a transition layer. Fig. 6c is a partially enlarged view of the area A shown in Fig. 6b. As shown in Fig. 6c, a transition layer 222 is provided on the surface of the side wall 12 of the first structural member 10 close to the first recessed area 11, and the first welding part 30 and the first The sidewalls 12 of the structural member 10 are connected by welding through the transition layer 222 . The material of the transition layer 222 may be at least one of copper, nickel, zinc, silver, and chromium. The provision of the transition layer is beneficial to improve the welding strength between the first structural member 10 and the second structural member 20 made of dissimilar materials.

Specifically, the material of the second structural member 20 is stainless steel, and the second structural member 20 is welded by a fusion welding process, and the weld between the second structural member 20 of stainless steel and the first welding portion 30 is formed by welding of the same material. The welding interface has high metal fusion welding strength and is not easy to form intermetallic compounds; moreover, the transition layer 222 is welded between the first welding part 30 and the side wall 12 of the first structural member 10, which can also reduce the intermetallic compounds during the welding process. It is generated to improve the mechanical strength of welded structural parts. In this embodiment, the whole welded structure has the wear resistance of steel and the low density and high mechanical strength of titanium metal or titanium alloy by combining snap connection, riveting and welding technology.

The welding process for welded structural parts may also include the following steps:

A first structural member 10 and a second structural member 20 are provided, and the materials of the first structural member 10 and the second structural member 20 are different; wherein, the first structural member 10 is provided with a through hole 13, and the through hole 13 is provided. The hole 13 includes a first opening 131 and a second opening 132;

passing at least part of the second structural member 20 through the through hole 13;

A first welding portion 30 is formed in the first recessed area 11 on the first structural member 10 to realize the welding of the first structural member 10 and the second structural member 20, wherein the first recessed area 11 includes The third opening 111 communicates with the fourth opening 112 , and the fourth opening 112 communicates with the first opening 131 ; the first welding portion 30 is made of the same material as the second structural member 20 .

In the specific processing process, the following steps are mainly included: First, the pretreatment of the structural parts: firstly, the first structural part 10 is milled to form the first recessed area 11 and the through hole 13. The first recessed area 11 can be A C-shaped recessed area or a rectangular recessed area; the second structural member 20 is processed so that the second structural member 20 includes a main body portion 21 and engaging portions 22 extending from both sides of the main body portion 21; The main body 21 of the second structural member 20 passes through the first hole 13 a of the first structural member 10 , and makes the engaging portion 22 locked in the second hole 13 b. A transition layer 222 (such as a nickel layer) is formed on the sidewall 12 of the first structure member 10 .

Second, welding process: the main body portion 21 (which may be the protruding portion 21a) of the second structural member 20 is spot-welded and melted, and the melted molten metal fills the first concave region 11 to form the first welded portion 30, and the first welding Part 30 is connected with the second structural member 20 to form a riveted structure; wherein, a welding interface (steel-steel) of the same metal is formed between the first welded part 30 and the second structural member 20; the first welded part 30 and the first structure The side walls 12 of the component 10 are welded through the transition layer 222 to form a welding interface (titanium-nickel-steel).

Third, improve the quality of the weld seam through heat treatment, and remove the internal stress at the joint by annealing treatment; then perform grinding and polishing to form a smooth welding surface.

It should be noted that the welding process used in this application may be laser spot welding, argon arc welding or other welding processes, which are not limited here. During the welding process, the molten metal liquid can be blown flat with protective gas to fill up the groove and form a smooth riveting structure surface. In other embodiments, the first welding portion 30 may also protrude from the first surface 101 of the first structural member 10 , which is not limited here.

By converting the welding of dissimilar metals (such as stainless steel and titanium) to the welding of the same metal (stainless steel and stainless steel, titanium and titanium), the generation of intermetallic compounds during the welding process can be reduced, and the internal stress at the welded joint can be reduced; at the same time , The riveted structure formed by welding can enhance the stability and mechanical strength of the welded structure. The welding interface between dissimilar metals is welded through the transition layer, which can form a welding interface with transition metals, and can also reduce the generation of intermetallic compounds, forming a composite welded structure with a firm structure.

The welded structural part prepared in this embodiment has a riveted structure and a snap-fit structure, and the structural stability can be improved by combining the two structures.

FIG. 7 is a perspective view of another welded structure provided by the embodiment of the present application. As shown in FIG. 7 , the welded structure 100 includes a first structure 10 and a second structure 20 .

Figure 8a is a schematic cross-sectional view of the first structural member provided by the embodiment of the present application. As shown in Figure 8a, the first structural member 10 is provided with a through hole 13, and the through hole 13 includes a first opening 131 and a second opening 132, at least partially The second structural member 20 passes through the through hole 13 .

Specifically, the first structural member 10 includes a first surface 101 and a second surface 102 oppositely disposed; in some embodiments, the first surface 101 and the second surface 102 may be flat surfaces. In other embodiments, the first surface 101 and the second surface 102 may also be surfaces with a certain radian or slope, which is not limited here. In this application, the scheme is introduced with the first surface 101 and the second surface 102 as planes, but this scheme is not limited. The material of the first structural member 10 is titanium or titanium alloy, and the titanium alloy can be a dual-phase alloy, which has good structural stability, good toughness, plasticity and high temperature deformation performance, and can be processed by hot pressure well. Specifically, the titanium alloy may be a titanium aluminum vanadium alloy (Ti-6Al-4V, TC4) or a TA2 titanium alloy.

The through holes 13 may be circular openings, square openings or other regular or irregular shapes, which are not limited here. In a specific embodiment, the through hole 13 may be a stepped hole, and the through hole 13 includes a connected first channel 13a and a second channel 13b, and the aperture of the first channel 13a is smaller than the aperture of the second channel 13b . A stepped hole is formed on the first structural member 10, and the snap connection between the first structural member 10 and the second structural member 20 can be realized through the stepped hole, which is beneficial to improve the connection strength of the overall structure.

Fig. 8b is a schematic cross-sectional view of the second structural member provided by the embodiment of the present application. As shown in Fig. 8b, the second structural member 20 includes a main body 21 and engaging parts 22 extending from both sides of the main body 21, at least Part of the main body portion 21 passes through the through hole 13 . Specifically, the main body portion 21 passes through the first hole 13a, and the engaging portion 22 is locked in the second hole 13b.

Figure 8c is a schematic cross-sectional view of the welded structural member provided by the embodiment of the present application before welding, as shown in Figure 8b and Figure 8c, the second structural member 20 is provided with an inclined structure 221, and the inclined structure 221 is connected to the first The structural member 10 cooperates to form a second recessed area 23 for receiving at least part of the second welding portion 40 . Specifically, the inclined structure 221 and the inner wall of the first structural member 10 together form a second recessed area 23, and the opening direction of the second recessed area 23 is the same as the opening direction of the second opening 132 (that is, the downward direction in FIG. 8c ). .

Figure 8d is a schematic cross-sectional view of the welded structure provided by the embodiment of the present application after welding, and Figure 8e is a partial enlarged view of the area B shown in Figure 8d, as shown in Figures 8d and 8e, the welded structure also includes a first Two welded parts 40, the second welded part 40 is welded to the first structural part 10 and the second structural part 20, the second welded part 40 is made of the same material as the first structural part 10, at least Part of the second welding portion 40 is located in the second recessed area 23 . The second welding portion 40 can be used to prevent the second structural member 20 from protruding from the through hole 13. The material body of the second welding portion 40 is the same as that of the first structural member 10, and can be welded by a fusion welding process. forming.

Preferably, the second welding portion 40 is matched with the second recessed area 23 , that is, the second welding portion 40 is filled in the second recessed area 23 , and the second welding portion 40 is in contact with the second surface 102 of the first structural member 10 Form a flat surface to facilitate subsequent assembly with other components.

At least part of the second welding portion 40 is welded to the sidewall of the first structural member 10 near the second recessed area 23 , and at least part of the second welding portion 40 is welded to the inclined structure 221 of the second structural member 20 .

Specifically, the engaging portion 22 of the second structural member 20 is provided with an inclined structure 221 on the side close to the second recessed area 23, and the surface of the inclined structure 221 is provided with a transition layer 222, and the transition layer 222 can be electroless plated. Or an electroplating process is formed on the surface of the inclined structure 221 . Specifically, the transition layer 222 has a thickness of 10 μm˜100 μm.

Please continue to refer to FIG. 8e, the side of the second welding portion 40 away from the first structural member 10 is provided with an inclined surface, and the side wall of the second welding portion 40 is in contact with the side of the first structural member 10 close to the second recessed area 23. For wall welding, the slope of the second welding portion 40 is connected to the slope structure 221 through a transition layer 222 by welding. In other embodiments, the second welding portion 40 may also be directly welded to the inclined structure 221 . Specifically, the second welding part 40 is titanium or a titanium alloy, and the first structural member 10 and the second welding part 40 are connected and fixed together by a fusion welding process. The first structural member 10 made of titanium or titanium alloy and the second welding part The welds between 40 and 40 are welds formed by melting and subsequent cooling of the same material. The metal fusion welding has high strength, does not form intermetallic compounds, and the connection is firm.

The inclined structure 221 of the second structural member 20 is welded to the second welding portion 40 through the transition layer 222 , which can also reduce the generation of intermetallic compounds during the welding process and improve the mechanical strength of the welded structural member. Moreover, since the engaging portion 22 of the second structural member 20 can be engaged in the second channel 13b of the through hole 13 of the first structural member 10, the overall structural stability of the welded structural member is improved, and the welded structural member is also made of steel. Wear resistance and low density and high mechanical strength of titanium metal or titanium alloy.

The welding process of welded structural parts mainly includes the following steps:

A second welding portion 40 is formed in the second recessed area 23 to realize the welding of the first structural member 10 and the second structural member 20; wherein, the second structural member 20 is provided with an inclined structure 221, so that The inclined structure 221 cooperates with the first structural member 10 to form the second recessed area 23 ; the second welding portion 40 is made of the same material as the first structural member 10 .

In the specific welding process,

First, the pretreatment of the structural parts: firstly, the first structural part 10 is milled to form the through hole 13; then the second structural part 20 is processed to form the engaging part 22, and the second One side of the opening 132 is milled to form an inclined structure 221 ; a transition layer 222 (for example, a copper layer) is formed on the surface of the inclined structure 221 . It should be noted that the transition layer 222 may be formed by processes such as electroplating, coating, spraying, etc., which is not limited here.

Second, welding process: the second welding part 40 is welded with the sidewall of the first structural member 10 close to the second recessed area 23 by laser spot welding, and the molten metal is filled in the second recessed area 23, so that the formed The second welding part 40 is welded to the inclined structure 221 of the second structural member 20 through the transition layer 222, wherein a part of the surface of the second welding part 40 is welded to the side wall of the first structural member 10 close to the second recessed area 23 Welding interface between the same metal (titanium-titanium); another part of the surface of the second welding part 40 is welded with the inclined surface of the inclined structure 221 of the second structural member 20 to form a welding interface with a transition metal (titanium-copper-steel) .

Figure 9 is a schematic cross-sectional view of another welded structural part provided in the embodiment of the present application before welding, and Figure 10 is a schematic cross-sectional view of another welded structural part provided in the embodiment of the present application after welding, and Figure 11 is a schematic view of the welded structural part provided in the embodiment of the present application. As shown in FIGS. 9 to 11 , the welded structure 100 includes a first structure 10 and a second structure 20 .

The first structure 10 is provided with a through hole 13, the through hole 13 includes a first opening 131 and a second opening 132; at least part of the second structure 20 passes through the through hole 13; the first structure The component 10 is further provided with a first recessed area 11 , the first recessed area 11 includes a third opening 111 and a fourth opening 112 , and the fourth opening 112 communicates with the first opening 131 .

The second structural member 20 includes a main body 21 and engaging portions 22 extending from two sides of the main body 21 , at least part of the main body 21 passes through the through hole 13 . An inclined structure 221 is disposed on the second structural member 20 , and the inclined structure 221 cooperates with the first structural member 10 to form a second recessed area 23 .

The welded structural part also includes a first welded part 30, the first welded part 30 is welded to the first structural part 10 and the second structural part 20, and the first welded part 30 is connected to the first welded part 30. The two structural components 20 are mainly made of the same material, and at least part of the first welding portion 30 is located in the first recessed area 11 . The first welding part 30 can be used to prevent the second structural part 20 from protruding from the through hole 13. The first welding part 30 is made of the same material as the first structural part 10, and can be welded by a fusion welding process. forming.

The welded structure also includes a second welded portion 40, the second welded portion 40 is welded to the first structure 10 and the second structure 20, the second welded portion 40 is connected to the first structure The material body of the component 10 is the same, and at least part of the second welding portion 40 is located in the second recessed area 23 . The second welding portion 40 can be used to prevent the second structural member 20 from protruding from the through hole 13. The material body of the second welding portion 40 is the same as that of the first structural member 10, and can be welded by a fusion welding process. forming.

In a specific embodiment, one end of the main body portion 21 of the second structural member 20 is passed through the through hole 13, and one end of the main body portion 21 protrudes relative to the first recessed area 11 of the first structural member 10 to form a protruding portion 21a, The engaging portion 22 of the second structural member 20 is engaged in the through hole 13 . In this embodiment, the first welding part 30 formed by melting the protruding part 21a of the main body part 21 matches the first recessed area 11; the side of the engaging part 22 close to the second opening 132 is processed to form an inclined structure 221, which is inclined The surface of the structure 221 may be provided with a transition layer 222, and the material of the transition layer 222 may be at least one of copper, nickel, zinc, silver, and chromium.

As shown in Figures 10 and 11, the protruding part 21a of the main body 21 is melted to form a liquid metal or liquid alloy and filled into the first recessed area 11 to form a first welding part 30, which is connected to the second welding part 30. A riveting structure is formed between the structural members 20 .

Specifically, the material of the first welding part 30 and the second structural part 20 can be steel, the second structural part 20 and the first welding part 30 are welded by a fusion welding process, and the second structural part 20 made of steel and the first welding part The welds between 30 are formed by welding the same material. The metal fusion welding strength is high, and it is not easy to form intermetallic compounds, such as TiFe and TiFe ₂ , which improves the mechanical strength of the welded structural parts. A transition layer 222 is provided on the surface of the side wall 12 of the first structural member 10 close to the first recessed area 11 , and the first welding portion 30 is connected to the side wall 12 of the first structural member 10 through the transition layer 222 .

The material of the first structural part 10 and the second welding part 40 is titanium or titanium alloy, and the second welding part 40 is fusion welded with the side wall of the first structural part 10 close to the second recessed area 23, and the second welding part 40 and the second The inclined structures 221 of the structural parts 20 are welded through the transition layer 222, which can also reduce the generation of intermetallic compounds during the welding process and improve the mechanical strength of the welded structural parts. Moreover, since the second structural member 20 can be clamped in the through hole 13 of the first structural member 10, the overall structural stability of the welded structural member is improved, and the welded structural member has both the wear resistance of steel and the durability of titanium metal or titanium alloy. Low density, high mechanical strength.

As shown in FIG. 12 a and FIG. 12 b , the second welding portion 40 can be integrally formed with the first structural member 10 , or can be welded to the second surface 102 along the edge of the second opening 132 of the through hole 13 . After the protruding portion 21a of the second structural member 20 is fused and welded to form the first welded portion 30, after the first welded portion 30 is filled in the first concave region 11, the second welded portion 40 is melted so that at least part of the second welded portion 30 is filled. The welding portion 40 covers the surface of the second structural member on a side close to the second opening 132 .

In other embodiments, the welding rod made of stainless steel may also be used to weld the first structural member 10 , and then the welding rod may be melted and filled in the second concave region 23 to form the second welding portion 40 .

In the specific processing process, it mainly includes the following steps:

First, the pretreatment of structural parts:

First, the first structural member 10 is milled to form a through hole 13 and the first recessed area 11. The first recessed area 11 can be a C-shaped recessed area or a rectangular recessed area; then the first structural member 10 is milled. , forming an inclined structure 221, the inclined structure 221 cooperates to form the second recessed area 12, the first recessed area 11 and the second recessed area 12 can be C-shaped grooves or rectangular grooves;

Process the second structural member 20 so that the second structural member 20 includes a main body portion 21 and engaging portions 22 extending from both sides of the main body portion 21; and pass the main body portion 21 of the second structure 20 The through hole 13 of the first structural member 10 is such that the engaging portion 22 is locked in the through hole 13 .

A transition layer 222 (such as a nickel layer) is formed on the sidewall surface of the first structural member 10 close to the first recessed region 11 .

An inclined structure 221 is formed on a side of the engaging portion 22 of the second structure member 20 close to the second opening 132 , and a transition layer 222 is formed on the inclined structure 221 .

The second, welding process: the protruding part 21a of the second structural member 20 (such as the second structural member of stainless steel material) is spot-welded and melted, and the melted metal melt fills in the first recessed area 11 to form a C-shaped first Welding portion 30; wherein, a welding interface (steel-steel) of the same metal is formed between the first welding portion 30 and the second structural member 20; the transition between the first welding portion 30 and the side wall of the first structural member 10 Layer 222 is welded to form a weld interface (titanium-copper-steel).

Third, welding process: the welding metal is melt-welded with the sidewall of the first structural member 10 close to the second opening 132 by laser spot welding, and the molten metal is filled in the second concave region 23 to form the second welding portion 40, and The second welding portion 40 is welded to the inclined structure 221 of the second structural member 20 through the transition layer, wherein a part of the surface of the second welding portion 40 is welded to the first structural member 10 to form a welding interface between the same metal (titanium-titanium ); another part of the surface of the second welding portion 40 is welded with the second structural member 20 to form a welding interface with a transition metal (titanium-nickel-steel).

Fourth, improve the quality of the weld seam through heat treatment, and remove the internal stress at the joint by annealing treatment; then it is enough to grind and polish to form a smooth weld seam surface, so as to obtain a welded structural part that is riveted on both sides.

In this embodiment, the main body portion 21 of the second structural member is cylindrical with a diameter of 0.9mm; a riveting structure is formed between the second structural member 20 and the first welding portion 30, and the second welding portion 40 is filled in the first welding portion 30. In the second recessed area 23, double-sided riveting welding can be realized, which can ensure that the welded structural parts remain stable and durable under long-term use, and can also avoid large internal stress caused by welding between different metals, reducing the occurrence of welded structural parts The probability of fracture increases the mechanical strength of the entire welded structure. After the pull-out test, the pull-out force of the double-sided riveted welded structural parts is ≥100N.

FIG. 13 a is a schematic cross-sectional view of another welded structure provided by the embodiment of the present application before welding. As shown in FIG. 13 a , the welded structure 100 includes a first structure 10 and a second structure 20 . Pass the main body 21 of the second structural member 20 through the through hole 13, wherein the engaging portion 22 of the second structural member 20 is locked in the through hole 13, at least part of the second structural member 20 is in contact with the first structural member 10 A protruding portion 21a is formed protruding relative to the first recessed area 11 of the first structural member 10 before welding.

Figure 13b is a schematic cross-sectional view of another welded structural member provided in the embodiment of the present application after welding. As shown in Figure 13b, the difference from the embodiment shown in Figure 10 is that in this embodiment, the second structural member The inclined structure 221 formed on the side close to the second opening 132 of 20 is a plane, and the inclined structure 221 cooperates with the first structural member 10 to form the second recessed area 23 . That is, the thickness of the engaging portion 22 is smaller than the depth of the second channel 13b; the transition layer 222 is formed on the inclined structure 221 of the second structural member 20, thereby improving the strength of the welding between dissimilar metals.

Fig. 13c is a partially enlarged view of area C shown in Fig. 13b. As shown in Fig. 13c, the side wall of the second welding part 40 is welded to the side wall of the first structural member 10 close to the second recessed area 23, and the second welding The welding connection between the part 40 and the engaging part 22 through the transition layer 222 can also reduce the formation of intermetallic compounds during the welding process and improve the mechanical strength of the welded structural part. Specifically, the material of the second welding part 40 is titanium or titanium alloy, the first structural part 10 and the second welding part 40 are welded by a fusion welding process, and the first structural part 10 and the second welding part 40 made of titanium or titanium alloy The welds between them are formed by welding of the same material. The metal fusion welding strength is high, and it is not easy to form intermetallic compounds, such as TiFe and TiFe ₂ , which improves the mechanical strength of the welded structural parts. Moreover, since the second structural member 20 can be clamped in the through hole 13, the overall structural stability of the welded structural member is improved, and the welded structural member has both the wear resistance of steel material and the low density and high mechanical strength of titanium metal or titanium alloy. .

Fig. 14 is a schematic structural diagram of a rotating shaft assembly in an electronic device provided by an embodiment of the present application. As shown in Fig. 14, the present application also provides an electronic device including a rotating shaft assembly 200, and the rotating shaft assembly 200 of the electronic device includes the above-mentioned The welded structural part 100 adopts the above-mentioned welding method to improve the stability of the overall structure. The welded structural part has both the wear resistance of steel and the low density and high mechanical strength of titanium or titanium alloy, which can improve the service life of electronic equipment. Specifically, the electronic device may be a foldable electronic device, and the foldable electronic device includes a hinge assembly 200 , and the welding structure 100 is located on the hinge assembly 200 .

The electronic device of the present application may be a foldable mobile phone, a notebook, a foldable wearable device, etc., which is not limited here.

The above are only preferred embodiments of the application, and are not intended to limit the application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the application shall be included in the protection of the application. within range.

Claims

A welded structural part, characterized in that the welded structural part comprises a first structural part and a second structural part, and the materials of the first structural part and the second structural part are different;

The first structural member is provided with a through hole, and the through hole includes a first opening and a second opening; at least part of the second structural member passes through the through hole;

The welded structure also includes:

A first welding portion welded to the first structural member and the second structural member; wherein, the first structural member is provided with a first recessed area, and the first recessed area includes a third opening and a first Four openings, the fourth opening communicates with the first opening; the first welding part is made of the same material as the second structural member, and at least part of the first welding part is located in the first recessed area within; and/or,

The second welding part welded to the first structural member and the second structural member; wherein, the second structural member is also provided with an inclined structure, and the inclined structure is formed in cooperation with the first structural member The second recessed area; the second welding portion is made of the same material as the first structural member; at least part of the second welding portion is located in the second recessed area.
The welded structural member according to claim 1, wherein at least part of the second structural member protrudes from a first recessed area relative to the first structural member before being welded to the first structural member The protruding part, the first welding part is formed by melting and welding the protruding part.
The welded structural part according to claim 1, wherein a transition layer is provided on the side wall surface of the first structural part close to the first recessed area, and the first welding part and the first structural part welded through transition layers.
The welded structural member according to claim 1 or 2, characterized in that, the first welded portion cooperates with the first recessed area.
The welded structural member according to claim 1, wherein a transition layer is provided on the surface of the inclined structure, and the second welding part is connected to the inclined structure through the transition layer.
The welded structural member according to claim 1 or 5, characterized in that, the second welding portion cooperates with the second recessed area.
The welded structural member according to any one of claims 1-6, characterized in that, the through hole is a stepped hole, the through hole includes a first channel and a second channel connected to each other, and the first channel The aperture is smaller than the aperture of the second channel; the second structural member includes a main body and engaging parts extending from both sides of the main body, the main body passes through the first channel, and the engaging The part is clamped in the second hole.
The welded structural part according to claim 7, wherein the second welding part is connected to the engaging part of the second structural part on a side away from the second opening.
The welded structure according to claim 7, characterized in that, a part of the second welding part is fusion-welded with the first structure part, and a part of the second weld part is stuck with the second structure part Joints are welded through a transition layer.
The welded structural part according to any one of claims 1-9, wherein the materials of the first structural part and the second welding part are selected from titanium metal, titanium alloy, aluminum alloy, magnesium alloy and carbon fiber at least one of; the material of the second structural member and the first welding part is selected from at least one of carbon steel, stainless steel, cobalt alloy, and nickel alloy.
The welded structural member according to claim 3 or 5, characterized in that the material of the transition layer is selected from at least one of copper, nickel, zinc, silver and chromium.
The welded structural part according to claim 11, characterized in that the transition layer has a thickness of 10 μm˜100 μm.
A method of forming a welded structure, comprising the steps of:

A first structural member and a second structural member are provided, the materials of the first structural member and the second structural member are different; wherein, the first structural member is provided with a through hole, and the through hole includes a first opening and second opening;

passing at least part of the second structural member through the through hole;

Welding the first structural member and the second structural member by the following method A and/or method B;

Said method A comprises:

A first welding portion is formed in the first recessed area on the first structural member to realize the welding of the first structural member and the second structural member, wherein the first recessed area includes a third opening and A fourth opening, the fourth opening communicates with the first opening; the first welding part is made of the same material as the second structural member;

Said method B comprises:

A second welding portion is formed in the second recessed area to realize the welding of the first structural member and the second structural member, wherein the second structural member is provided with an inclined structure, and the inclined structure is connected to the second structural member. The first structural component cooperates to form the second recessed area; the second welding portion is made of the same material as the first structural component.
The method according to claim 13, wherein at least part of the second structural member in the welded structural member is welded with the first structural member at the first structural member relative to the first structural member. A recessed area protrudes to form a protruding part, and forming a first welding portion in the first recessed area on the first structural member includes:

The protruding portion is melted to form the first weld.
The method according to claim 13, characterized in that, forming a first welding portion in the first recessed area on the first structural member to realize the connection between the first structural member and the second structural member Welding includes:

forming a transition layer on the sidewall of the first structural member located in the first recessed region;

Fusion welding the end of the second structural member close to the first recessed area to form the first welded portion, and welding the first welded portion to the first structural member through the transition layer.
The method of claim 15, wherein the first welding portion cooperates with the first recessed area.
The method according to any one of claims 13 to 16, wherein the through hole is a stepped hole, the through hole includes a first channel and a second channel connected to each other, and the diameter of the first channel is smaller than Aperture of the second channel; before the first welded portion is welded to the first structural member and the second structural member, the method further includes:

Processing the second structural member, so that the second structural member includes a main body and engaging portions extending from both sides of the main body;

The main body of the second structure is passed through the first hole of the first structure, and the engaging portion is locked in the second hole.
The method according to claim 17, wherein the forming a second welding portion in the second recessed area to realize the welding of the first structural member and the second structural member comprises:

An inclined structure is formed on a side of the engaging portion of the second structural member close to the second opening, and a transition layer is formed on the inclined structure;

Fusion welding the second welding portion to the first structural component, and welding the second welding portion to the second structural component through the transition layer.
The method according to claim 17 or 18, characterized in that the second welding portion cooperates with the second recessed area.
A welded structural part, characterized in that the welded structural part is formed by the method described in any one of claims 13-19.
An electronic device, characterized by comprising the welded structural part according to any one of claims 1 to 12 or the welded structural part according to claim 20.
The electronic device according to claim 21, wherein the electronic device is a foldable electronic device, the foldable electronic device includes a hinge assembly, and the welding structure is located in the hinge assembly.