Connecting structure based on friction stir welding

Abstract

The utility model belongs to the technical field of conductive flexible connection, and particularly relates to a connecting structure based on friction stir welding, which comprises a metal connecting piece and a connecting belt. The connecting belt comprises a supporting section and a welding section which are connected with each other; one side end of the welding section is connected with one side end of the metal connecting piece in a friction stir welding mode. The supporting section is arranged at the other side end, away from the metal connecting piece, of the welding section. The connection strength can be improved, and the flatness of the surface of a welding seam of a flexible connection product can be guaranteed; and the overall mechanical performance and electrical performance can also be improved.

Description

Technical Field

[0001] This utility model belongs to the field of conductive flexible connection technology, and in particular relates to a connection structure based on friction stir welding. Background Technology

[0002] Flexible connectors are suitable for various high-voltage electrical appliances, vacuum electrical appliances, explosion-proof switches in mining, and related products such as automobiles and locomotives. They have advantages such as high product quality, strong conductivity, large current carrying capacity, low resistance, and durability, and are widely used in metallurgy, chemical industry, power substation engineering, and power equipment. Currently, these industries mostly use copper strip flexible connectors or aluminum strip flexible connectors, which have long service life and good current carrying capacity.

[0003] However, most existing soft connection structures have low structural strength and poor conductivity, which cannot meet the requirements of certain application scenarios. Utility Model Content

[0004] The purpose of this invention is to provide a connection structure based on friction stir welding, which addresses the shortcomings of existing technologies and solves the technical problem of low structural strength in existing technologies.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A connection structure based on friction stir welding includes a metal connector and a connecting strip; the connecting strip includes a support section and a welding section connected to each other; one end of the welding section is connected to one end of the metal connector by friction stir welding; the support section is disposed on the other end of the welding section away from the metal connector.

[0007] Preferably, the welding section has a straight abutting side face on one end face that is different from the metal connector and the support section; the straight abutting side face is used to abut against the clamping guide block.

[0008] Preferably, the support section has at least one assembly gap.

[0009] Preferably, the support segment includes a straight block and at least one arc-shaped block; all the arc-shaped blocks are stacked on the upper / lower side of the straight block; and the straight block is connected to the other end of the welding segment away from the metal connector; all the arc-shaped blocks are connected to the other end of the welding segment away from the metal connector; the assembly gap is formed between two adjacent arc-shaped blocks and between the straight block and the arc-shaped block.

[0010] Preferably, in the length direction of the support segment, the thickness d1 of the assembly gap near the welding segment and the thickness d2 of the assembly gap away from the welding segment satisfy the following condition: d1 < d2.

[0011] Preferably, in the thickness direction of the support segment, the thickness d3 of the assembly gap near the straight block and the thickness d4 of the assembly gap away from the straight block satisfy the following condition: d3≤d4.

[0012] Preferably, the welding section is provided with at least one first positioning hole; the first positioning hole extends through the thickness of the welding section.

[0013] Preferably, the distance between the first positioning hole and the metal connector along the length direction is L, where L satisfies: 4cm≤L≤8cm.

[0014] Preferably, the metal connector has at least one second positioning hole; the second positioning hole extends through the thickness of the metal connector.

[0015] The beneficial effects of this utility model are as follows: This technical solution uses friction stir welding to achieve molecular diffusion welding fusion between the welded section and the metal connector, thereby improving the connection strength between the metal connector and the connecting strip, and helping to ensure the surface smoothness of the weld of the flexible connection product; it can also improve the overall mechanical and electrical properties, meeting the requirements of certain high-requirement application scenarios in the industry; in addition, the welding process has low energy consumption, high reliability, no need for welding wire and shielding gas, low cost, and the welding process is safe, pollution-free, smoke-free, and radiation-free. Attached Figure Description

[0016] The following will refer to the appendix. Figures 1-4 This section describes the features, advantages, and technical effects of exemplary embodiments of the present invention.

[0017] Figure 1 This is a schematic diagram of a connection structure based on friction stir welding according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of a connection structure based on friction stir welding according to an embodiment of the present invention;

[0019] Figure 3 This is a cross-sectional view of a connection structure based on friction stir welding according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of a connection structure based on friction stir welding according to an embodiment of the present invention.

[0021] In the figure: 1-Metal connector; 11-Second positioning hole; 2-Connecting strip; 21-Support section; 211-Straight block; 212-Arc block; 201-Assembly gap; 22-Welding section; 221-First positioning hole; 222-Abutting side straight surface. Detailed Implementation

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0023] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0024] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0025] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or multiple situations existing alone. In addition, the character " / " in this document generally indicates that the related objects before and after are in an "or" relationship.

[0026] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0027] The following is in conjunction with the appendix Figures 1-4 The present invention will be described in further detail, but this is not intended to limit the scope of the present invention.

[0028] like Figure 1As shown in one embodiment of this utility model, the connection structure based on friction stir welding includes a metal connector 1 and a connecting strip 2. The connecting strip 2 includes a support section 21 and a welding section 22 connected to each other. One end of the welding section 22 is connected to one end of the metal connector 1 by friction stir welding. The support section 21 is located on the other end of the welding section 22 away from the metal connector 1. The metal connector 1 is an aluminum plate. The connecting strip 2 is a flexible aluminum connecting strip.

[0029] The technical solution of this utility model adopts friction stir welding to achieve molecular diffusion welding fusion between the welded section and the metal connector, thereby improving the connection strength between the metal connector and the connecting strip and helping to ensure the surface smoothness of the weld of the flexible connection product; it can also improve the overall mechanical and electrical properties, meeting the requirements of certain high-requirement application scenarios in the industry; in addition, the welding process has low energy consumption, high reliability, no need for welding wire and shielding gas, low cost, and the welding process is safe, pollution-free, smoke-free and radiation-free.

[0030] Friction stir welding (FSW) utilizes frictional heat and plastic deformation heat as the welding heat source. The welding process involves inserting a cylindrical or other shaped (e.g., threaded cylinder) stirring pin into the joint of the workpiece. The high-speed rotation of the welding head causes friction between the pin and the workpiece material, raising the temperature and softening the material at the joint. Simultaneously, the material is stirred and frictionally stirred to complete the weld. During welding, the workpiece is rigidly fixed to a backing pad, while the welding head rotates at high speed and moves relative to the workpiece along the joint. The protruding section of the welding head extends into the material for friction and stirring, while the shoulder of the welding head generates heat through friction with the workpiece surface, preventing the overflow of plastic material and removing surface oxide films. Friction stir welding can easily join similar or dissimilar materials, including metals, some metal-based composites, ceramics, and plastics. Compared with traditional fusion welding, friction stir welding (FSW) does not require the addition of welding wire or shielding gas; the welding process is pollution-free, smoke-free, and radiation-free, and the residual stress of the weld joint is low. Therefore, it has a series of advantages such as high welding efficiency, small welding deformation, low energy consumption, simple equipment, and safe welding process.

[0031] Specifically, in some implementations, such as Figure 1 and 2As shown, the welding section 22 differs from the metal connector 1 and the support section 21 in that one end face has an abutment side straight surface 222; the abutment side straight surface 222 is used to abut against the clamping guide block. There are two abutment side straight surfaces 222, symmetrically arranged on both ends of the welding section 22. That is, through the abutment and clamping action of the clamping guide block against the abutment side straight surface 222, the keyhole generated by the stirring head entering and exiting the weld can be eliminated at both ends during welding; thereby improving the connection strength and ensuring the surface smoothness of the weld in the flexible connection product; it can also improve the overall mechanical and electrical properties, meeting the requirements of certain high-performance applications in the industry.

[0032] Specifically, such as Figure 1 and 2 As shown, the welding section 22 is provided with at least one first positioning hole 221; the first positioning hole 221 is provided through the thickness of the welding section 22. Wherein, as... Figure 2 As shown, there are three first positioning holes 221, which are arranged side by side at equal intervals. That is, the first positioning holes 221 can be used for pin fixing during welding; after welding, these first positioning holes 221 are riveted with rivets of the same material and the surface is ground smooth; thereby improving the ease of assembly between the connecting structure and the special tooling. Furthermore, as... Figure 2 and 3 As shown, the distance between the first positioning hole 221 and the metal connector 1 along the length direction is L, where L satisfies: 4cm ≤ L ≤ 8cm; it can be 4cm, 4.5cm, 5cm, and 8cm, etc.; preferably 5cm. This structure ensures the orderly operation of the welding and stirring area through the first positioning hole 221 at a suitable distance; and it can also be adapted to tooling of more different sizes (if the distance is too short, the welding and stirring area will cover the first positioning hole 221; if the distance is too long, it will affect the assembly positioning effect).

[0033] Specifically, in some implementations, such as Figure 1 As shown, the support section 21 is provided with at least one assembly gap 201. This structure buffers the stress generated during the welding process through the assembly gap 201, thereby avoiding excessive welding deformation of the connecting strip 2, thus improving the connection strength and ensuring the surface smoothness of the weld seam of the flexible connection product; it can also improve the overall mechanical and electrical properties.

[0034] Specifically, in some implementations, such as Figure 1 , 2As shown in Figure 3, the support segment 21 includes a straight block 211 and at least one arc-shaped block 212; all the arc-shaped blocks 212 are stacked on the upper / lower side of the straight block 211; and the straight block 211 is connected to the other end of the welding segment 22 away from the metal connector 1; all the arc-shaped blocks 212 are connected to the other end of the welding segment 22 away from the metal connector 1; the assembly gap 201 is formed between two adjacent arc-shaped blocks 212 and between the straight block 211 and the arc-shaped block 212; the arc-shaped block 212 is arranged with an arc-shaped protrusion on the side away from the straight block 211. In some embodiments, such as... Figure 3 and 4 As shown, there are six arc-shaped blocks 212, three of which are located on the lower side of the straight block 211, and the other three are located on the upper side of the straight block 211. This structure, with its multiple symmetrically arranged arc-shaped blocks 212, ensures the flexibility and strength of the connection structure, thereby helping to guarantee the surface smoothness of the weld seam in the flexible connection product; it can also improve the overall mechanical and electrical properties.

[0035] Specifically, in some implementations, such as Figure 3 As shown, along the length of the support segment 21, the thickness d1 of the assembly gap 201 near the welding segment 22 and the thickness d2 of the assembly gap 201 away from the welding segment 22 satisfy the condition: d1 < d2. This structure, by gradually increasing the assembly gap 201 along the length of the support segment 21 from the welding segment 22, ensures the flexibility of the connection structure and its structural strength, thereby helping to ensure the surface smoothness of the weld seam in the flexible connection product; it can also improve the overall mechanical and electrical properties.

[0036] Specifically, in some implementations, such as Figure 3 As shown, in the thickness direction of the support segment 21, the thickness d3 of the assembly gap 201 near the straight block 211 and the thickness d4 of the assembly gap 201 away from the straight block 211 satisfy the condition: d3 ≤ d4. This structure, by gradually increasing the assembly gap 201 along the length direction from the straight block 211 towards the arc-shaped block 22, ensures the flexibility of the connection structure and its structural strength, thereby helping to guarantee the surface flatness of the weld seam in the flexible connection product; it can also improve the overall mechanical and electrical properties.

[0037] Specifically, in some implementations, such as Figure 1 and 2 As shown, the metal connector 1 has at least one second positioning hole 11; the second positioning hole 11 extends through the thickness of the metal connector 1. Wherein, as... Figure 4As shown, there are twelve second positioning holes 11, arranged in an equidistant array to improve the assembly stability between the metal connector 1 and the tooling.

[0038] The production operation steps are as follows:

[0039] (1) Activate the welding areas at both ends of the welding section in the connecting strip, and then perform molecular diffusion welding fusion hardening;

[0040] (2) A first positioning hole is machined at an appropriate position in the hardened area of ​​the welded section in the connecting strip for welding fixation;

[0041] (3) Use special tooling to fix the welding section in the connecting strip to the metal connector according to the welding dimensions, and place clamping blocks at both ends of the weld of the welding section in the connecting strip.

[0042] (4) Friction stir welding: control the position of the stirring head in and out on the clamping block;

[0043] (5) Remove the clamping blocks and grind the area around the weld in the welding section of the connecting strip.

[0044] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0045] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above, and any obvious improvements, substitutions, or modifications made by those skilled in the art based on this utility model are within the protection scope of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A friction stir welding-based joining structure, characterized by: The connecting band comprises mutually connected support segments and welding segments; one side end of the welding segment is connected with one side end of the metal connecting piece by friction stir welding; the support segment is arranged at the other side end of the welding segment away from the metal connecting piece.

2. The friction stir welding-based joining structure according to claim 1, characterized by: The welding segment is different from the metal connecting piece and the side end face of the support segment, and is provided with an abutting side straight face; the abutting side straight face is used for abutting with a clamping guide block.

3. The friction stir welding-based joining structure according to claim 1, characterized by: At least one assembly gap is arranged in the support segment.

4. The friction stir welding based joining structure according to claim 3, characterized by: The support segment comprises a flat block and at least one arc-shaped block; all the arc-shaped blocks are arranged on the upper side and / or the lower side of the flat block in a stacked manner; the flat block is connected to the other side end of the welding segment away from the metal connecting piece; all the arc-shaped blocks are connected to the other side end of the welding segment away from the metal connecting piece; two adjacent arc-shaped blocks and the flat block and the arc-shaped blocks form the assembly gap.

5. The friction stir welding based joining structure according to claim 3 or 4, characterized by: In the length direction of the support segment, the thickness d1 of the assembly gap close to the welding segment and the thickness d2 of the assembly gap away from the welding segment satisfy: d1 6. The friction stir welding based joining structure according to claim 4, characterized by: In the thickness direction of the support segment, the thickness d3 of the assembly gap close to the flat block and the thickness d4 of the assembly gap away from the flat block satisfy: d3≤d4.

7. The friction stir welding based joining structure according to Claim 1, characterized by: At least one first positioning hole is arranged in the welding segment; the first positioning hole is arranged through the thickness of the welding segment.

8. The friction stir welding based joining structure according to claim 7, characterized by: The distance between the first positioning hole along the length direction and the metal connecting piece is L, and L satisfies: 4cm≤L≤8cm.

9. The friction stir welding based joining structure according to claim 1 or 7, characterized by: At least one second positioning hole is arranged in the metal connecting piece; the second positioning hole is arranged through the thickness of the metal connecting piece.

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