High-conductivity copper-clad aluminum composite wire

Abstract

The utility model discloses a high-conductivity copper-clad aluminum composite wire which comprises a core body, a coating layer and a welding part, and the surface of the core body is coated with the coating layer; the cladding layer is connected end to end to form a V-shaped welding seam, and the welding part is filled in the V-shaped welding seam, so that the cladding layer and the welding part are connected into a whole. The phenomenon of welding seam collapse caused by direct end-to-end welding connection of the cladding layer is avoided, and the phenomenon of undesirable joint such as peeling in the subsequent drawing production process of the high-conductivity copper-clad aluminum composite wire is prevented.

Description

Technical Field

[0001] This utility model relates to the field of composite wire technology, specifically to a high-conductivity copper-clad aluminum composite wire. Background Technology

[0002] Traditional copper-clad aluminum composite wire is made by directly wrapping copper strips around aluminum or aluminum-magnesium alloy wires that serve as the core wire, welding the copper strip joints with argon arc welding, and then drawing the wires multiple times.

[0003] High copper content is a requirement for the high conductivity of copper-clad aluminum composite wires. In actual production, the copper content of the composite wire is increased by using thicker copper strips. However, due to the excessive thickness of the copper strips, a V-shaped weld seam forms between the ends of the copper strip when it is wrapped around the aluminum wire. This causes a "collapse phenomenon" in the weld seam when the copper strips are directly welded together using traditional welding methods, affecting subsequent processing of the composite wire and leading to a decrease in its conductivity. Therefore, under this limitation, only bimetallic composite wires with a copper content of ≤40% can be produced, and their conductivity, tensile strength, elongation, and other performance indicators cannot meet the requirements of product applications in many fields. Utility Model Content

[0004] To address the shortcomings of existing technologies, a high-conductivity copper-clad aluminum composite wire is provided.

[0005] To achieve the above objectives, this utility model provides a high-conductivity copper-clad aluminum composite wire, comprising a core, a cladding layer, and a welding section. The cladding layer covers the surface of the core. The cladding layers are joined end to end to form a V-shaped weld, and the welding section fills the V-shaped weld.

[0006] According to one embodiment of the present invention, the core is an aluminum alloy wire and the cladding layer is a copper strip.

[0007] According to one embodiment of the present invention, the weight ratio of the cladding layer to the highly conductive copper-clad aluminum composite wire is 40%-70%.

[0008] According to one embodiment of the present invention, the specific gravity of the high conductivity copper-clad aluminum composite wire is 5.35 (g / cm³).

[0009] According to one embodiment of the present invention, the material of the welded part is the same as the material of the cladding layer.

[0010] According to one embodiment of this utility model, the material of the welded part is pure copper.

[0011] The beneficial effect of this invention lies in the fact that the cladding layer covers the surface of the core. Due to the excessive thickness of the cladding layer, a V-shaped weld is formed between the two ends of the cladding layer. The welded portion fills within the V-shaped weld, thus connecting the cladding layer and the welded portion into a single unit. This avoids the weld collapse that would occur if the ends of the cladding layer were directly welded together, and prevents poor bonding phenomena such as peeling during subsequent drawing processes of high-conductivity copper-clad aluminum composite wires. Attached Figure Description

[0012] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0013] Figure 1 This is a cross-sectional schematic diagram of the highly conductive copper-clad aluminum composite wire in the embodiment.

[0014] Explanation of reference numerals in the attached figures

[0015] 1-Core; 2-Clad layer; 3-Welding part. Detailed Implementation

[0016] The following drawings will disclose several embodiments of this utility model. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this utility model. That is, in some embodiments of this utility model, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0017] Furthermore, in this utility model, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the utility model. They are merely used to distinguish components or operations described with the same technical terms and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0018] Please refer to Figure 1 , Figure 1This is a cross-sectional schematic diagram of a high-conductivity copper-clad aluminum composite wire. This embodiment provides a high-conductivity copper-clad aluminum composite wire, comprising a core 1, a cladding layer 2, and a welding portion 3. The core 1 is made of aluminum alloy wire, and the cladding layer 2 is made of copper strip. The cladding layer 2 covers the surface of the core 1. Due to the excessive thickness of the cladding layer 2, a V-shaped weld is formed between its two ends. The welding portion 3 fills the V-shaped weld, connecting the cladding layer 2 and the welding portion 3 into a single unit. This avoids the weld collapse that would occur if the ends of the cladding layer 2 were directly welded together, preventing peeling and other poor bonding issues during subsequent drawing processes of the high-conductivity copper-clad aluminum composite wire.

[0019] It should be noted that the welded part 3 is formed by melting pure copper wire and filling it into the V-shaped weld, then cooling and solidifying it. By using pure copper wire to fill and weld in the V-shaped weld, the beginning and end of the cladding layer 2 are welded together as a whole, so that the cladding layer 2 tightly wraps around the core 1, effectively improving the tightness of the bond between the core 1 and the cladding layer 2.

[0020] Furthermore, the weight ratio of the cladding layer 2 to the high-conductivity copper-clad aluminum composite wire is 40%-70%, which gives the high-conductivity copper-clad aluminum composite wire a high copper content, effectively improving its electrical conductivity performance to meet the product application needs of more fields.

[0021] Furthermore, the specific gravity (i.e., relative density) of the high-conductivity copper-clad aluminum composite wire provided in this embodiment is 5.35 g / cm³. Compared to the specific gravity of pure copper conductors (8.9 g / cm³), the weight of the high-conductivity copper-clad aluminum composite wire is effectively reduced. This makes the high-conductivity copper-clad aluminum composite wire suitable for a wider range of applications.

[0022] In addition, the heat capacity of the high conductivity copper-clad aluminum composite wire in this embodiment is 0.905 KJ / kg•k, while the heat capacity of pure copper is 0.386 KJ / kg•k. Thus, under the same conditions, the high conductivity copper-clad aluminum composite wire of this application heats up more slowly.

[0023] In summary, by using welded portions 3 to fill the V-shaped weld seam of the cladding layer 2, and connecting the beginning and end of the cladding layer 2 with welded portions 3, the cladding layer 2 is tightly wrapped around the core 1. This avoids the weld seam collapse that would occur if the beginning and end of the cladding layer 2 were directly welded, and ensures that even a thick cladding layer 2 can tightly wrap around the core 1. This effectively improves the tensile strength of the high-conductivity copper-clad aluminum composite wire.

[0024] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A high-conductivity copper-clad aluminum composite wire, characterized by, The application relates to a high-conductivity copper-clad aluminum composite wire, which comprises a core (1), a cladding layer (2) and a welding part (3), the cladding layer (2) is cladded on the surface of the core (1); the cladding layer (2) is connected at the tail end and forms a V-shaped welding seam, and the welding part (3) is filled in the V-shaped welding seam. The core (1) is an aluminum alloy wire, and the cladding layer (2) is a copper strip.

2. The high-conductivity copper-clad aluminum composite wire of claim 1, wherein, The weight ratio of the cladding layer (2) to the high-conductivity copper-clad aluminum composite wire is 40%-70%.

3. The high-conductivity copper-clad aluminum composite wire of claim 1, wherein, The specific gravity of the high-conductivity copper-clad aluminum composite wire is 5.35 (g / cm3).

4. The high-conductivity copper-clad aluminum composite wire of claim 1, wherein, The material of the welding part (3) is the same as that of the cladding layer (2).

5. The high-conductivity copper-clad aluminum composite wire of claim 1, wherein, The material of the welding part (3) is pure copper.

6. The high-conductivity copper-clad aluminum composite wire of claim 1, wherein, ​

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