KR20200129443A - A Copper Clad Aluminum Cable For Arc-Welding - Google Patents

Abstract

The present invention relates to a lightweight arc welding cable made of copper (Cu)-clad aluminum, having: wires each having a Cu layer integrally formed on the outside of an aluminum core conductor; and an outer coating layer formed on the outside of the wires. The wire includes: an aluminum core of a 99% or more purity as a central conductor; and a Cu layer of an at least 99.9% purity formed on the outside of the core. The aluminum core and the copper layer are composed of an 84-86% aluminum and a 14-16% Cu layer with respect to the volume of the wire. The lightweight arc welding cable represents a weight reduction of at least 35% compared to the existing Cu conductor, and can be lightened with a weight reduction of up to 43%, capable of obtaining cost savings of 10% or more compared to the existing Cu conductor product. Nevertheless, compared to the existing Cu cable, the lightweight arc welding cable exhibits a current capacity of 85.2-90.5% so that arc welding can be sufficiently performed, thereby replacing the conventional welding cable.

Description

A Copper Clad Aluminum Cable For Arc-Welding}

The present invention relates to a copper-clad aluminum lightweight arc welding cable, and in particular, an improved copper-clad aluminum lightweight for electric cables or welding cables by covering an aluminum core with copper to provide necessary electrical properties while reducing weight and cost. It relates to a cable for arc welding.

In general, copper has been the most widely used as a conductor for electric wires and cables because of its excellent conductivity, but it is heavy with a high specific gravity of 8.92, so it takes a lot of transportation cost. In particular, the cost of raw materials is greatly increased. There was a demand for the development of an alternative material that could replace.

As a cable conductor to replace such copper, in the domestic utility model registration No. 20-0433624 (registration date 2006.12.05), in a power transmission cable, a core portion made of aluminum metal and at least one or more layers surrounding the core portion An aluminum core cable comprising a cladding layer has been proposed.

However, although it is possible to achieve weight reduction by replacing copper with aluminum, which is a lightweight material, there is a problem that the electrical conductivity is only 60% compared to copper, which makes it unsuitable for wire and cable materials.

On the other hand, in Korean Patent Publication No. 10-1938007 (registration date January 7, 2019), at least one first wire made of an aluminum alloy, an inner wire made of aluminum or an aluminum alloy, and copper surrounding the inner wire. It includes at least one second wire comprising an outer wire consisting of, but having a cross-sectional area ratio of the outer wire of 20% to 25%, and the second wire rod is in the outermost layer of the assembly in which the first wire rod and the second wire rod are stranded. A conductor is disclosed, characterized in that it is arranged.

However, since the conductor of the prior patent technology described above uses an aluminum alloy as a core material, the electric conduction property is deteriorated, so that the ratio of the cross-sectional area of copper provided on the outside must be increased to solve such a problem, so the weight is increased, and the weight is increased compared to that of the pure aluminum core. Due to its low flexibility, it was not particularly suitable for arc welding cables that require high flexibility.

Domestic Registration Utility Model No. 20-0433624 (Registration Date 2006.12.05) Domestic Patent Publication No. 10-1938007 (Registration Date January 7, 2019)

In order to solve the problems of the prior art, it is an object of the present invention to twist and twist a plurality of fine wires clad with copper of 99.9% purity on the outside of an aluminum core with a purity of 99% or more, and twist them into strands to achieve required electrical conductivity and welding. It is to provide an improved copper clad aluminum lightweight arc welding cable to have the flexibility required in the cable.

In order to achieve the above object, the copper clad aluminum lightweight arc welding cable according to the present invention includes wire rods in which a copper layer was integrally clad on the outside of an aluminum center conductor, and a copper clad aluminum lightweight outer cladding layer formed on the outside of the wire rods. In the arc welding cable,

The wire rod includes an aluminum core having a purity of 99% or higher as a central conductor, and a plurality of fine wires clad with copper having a purity of at least 99.9% outside the core member, and the aluminum core member and the copper layer are aluminum with respect to the volume of the wire rod. It is characterized by consisting of a volume ratio of 84 to 86%, copper layer 14% to 16%.

The copper-clad aluminum wire is assembled with a plurality of fine wires drawn with a small wire diameter of 0.20±0.02 mm, and twisted 7 strands (7 strands) to 19 strands (19 strands) of these strands at an appropriate pitch and twisted at a preset pitch. Is formed.

In addition, a separator is provided on the outside of the wire rod, and a single coating that serves as an insulator and sheath of the extruded rubber mixture is formed on the outside.

The extruded rubber mixture as a single coating that serves as both an insulator and a sheath may be one selected from extruded rubber (SE3) and chloroprene rubber (SE4) having a tensile strength of 7.0 N/mm 2 or more.

In addition, the separator is preferably any one selected from nonwoven fabric and paper having a thickness of 0.075 to 0.10 mm.

According to the present invention, a copper-clad aluminum cable with copper cladding on an aluminum core as a central conductor. The copper-clad aluminum cable represents a weight reduction of at least 35% compared to the existing copper conductor, and weight reduction of up to 43% can be realized. Compared to copper (Cu) conductor products, cost savings of more than 10% can be obtained. Nevertheless, since the current capacity is 85.2~90.5% compared to the existing copper cables, arc welding can be sufficiently performed. There is an effect that can replace.

Figure 1 is a schematic perspective view of a copper copper aluminum lightweight arc welding cable according to the present invention.
Figure 2 is a schematic perspective view of a 19-stranded cable manufactured using a copper-clad aluminum wire according to the present invention.
Figure 3 is a schematic perspective view showing a cross-section of the copper-covered aluminum fine wire of Figure 2;

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings showing an embodiment of a copper-clad aluminum lightweight arc welding cable according to the present invention.

In Figure 1, the copper-clad aluminum lightweight arc welding cable 1 according to the present invention is a copper-clad aluminum conductor 2 formed by twisting and twisting a plurality of copper clad aluminum (CCA) wires, and the outer peripheral surface thereof. A separator 3 provided by winding and a sheath 4 provided on an outer peripheral surface of the separator 3 are included.

In general, welding cables have a primary wire that connects from the power source to a welding machine and a secondary wire that connects to the base material and holder. The primary wire uses an ordinary electric wire, and the secondary wire uses a flexible wire to facilitate welding, and weight reduction is required for operator convenience.

As shown in Fig. 2, the conductor 2 is a copper-clad aluminum wire, which includes a plurality of fine wires 21' drawn with a small wire diameter of 0.20±0.02 mm, and in the illustrated embodiment, seven fine wires 21' For example, 7 strands (7 strands) to 19 strands (19 strands) are twisted and twisted at an appropriate pitch to form an aggregated line 21, and in the illustrated embodiment, 19 strands are twisted at a preset pitch. do.

As shown in FIG. 3, the fine wire 21 ′ is an aluminum core 211 having a purity of 99% or higher as a central conductor, and a copper layer 212 of at least 99.9% purity cladding outside the core 211 It is formed of a copper-covered aluminum thin wire containing.

The aluminum core 211 and the copper layer 212 are preferably formed in a volume ratio of 84 to 86% of aluminum and 14% to 16% of the copper layer with respect to the volume of the wire. Accordingly, the copper-clad aluminum of the present invention has an allowable current performance of 80 to 90% compared to the existing copper wire of the same standard to have a good current capacity for welding.

Accordingly, Examples 1 to 6 prepared according to the conductor cross-sectional area of the copper-clad aluminum wire rod according to the present invention and Comparative Examples 1 to 6 in which the wire rod was a copper conductor were shown in Table 1 below in terms of weight.

Weight comparison reduction ratio between copper-clad aluminum lightweight arc welding cable and copper welding cable of the present invention Form neck Conductor cross section
(mm ₂ ) Full diameter
(mm) Weight (g/m) Weight reduction rate (%) Example 1 (copper cable)
Comparative Example 1 (Copper Cable) 16
16 10.2
10.0 140.0
220.0 -36 Example 2 (copper cable)
Comparative Example 2 (Copper Cable) 25
25 11.6
11.5 195.0
300.0 -35 Example 3 (copper cable)
Comparative Example 3 (Copper Cable) 35
35 13.5
13.0 278.0
430.0 -35 Example 4 (copper cable)
Comparative Example 4 (Copper Cable) 50
50 14.9
15.8 359.0
630.0 -43 Example 5 (copper cable)
Comparative Example 5 (Copper Cable) 70
70 17.3
17.2 477.0
856.0 -44 Example 6 (copper cable)
Comparative Example 6 (Copper Cable) 95
95 19.5
20.0 638.0
1119.0 -43

From the top, the copper (Cu) conductor has a specific gravity of 8.92 g/cm3, whereas the copper-clad aluminum (CCA) conductor according to the present invention has a weight specificity of 3.65 g/cm3, and the copper-clad aluminum conductor of the present invention is compared to the conventional copper conductor. It can be seen that the weight reduction of at least 35% was shown, and weight reduction of up to 43% can be realized. In addition, with such weight reduction, economic feasibility of 10% or more compared to copper (Cu) conductor products can be realized.

The results of comparing and lowering the current capacity for Examples 1 to 6 and Comparative Examples 1 to 6 were shown in Table 2 below.

item Conductor cross section
(mm ₂ ) Full diameter
(mm) Indoor temperature
(℃) Cable temperature
(℃) Current quantity
(A) Copper contrast
Current capacity ratio (%) Example 1
(Copper cable)
Comparative Example 1
(Copper cable) 16
16 10.2
10.0 25.2
25.0 85.2
85.2 125.0
144.0 86.3 Example 2
(Copper cable)
Comparative Example 2
(Copper cable) 25
25 11.6
11.5 25.2
25.5 85.4
85.0 171.0
189.0 90.5 Example 3
(Copper cable)
Comparative Example 3
(Copper cable) 35
35 13.5
13.0 24.5
24.8 85.5
85.0 223.0
248.0 89.9 Example 4
(Copper cable)
Comparative Example 4
(Copper cable) 50
50 14.9
15.8 24.6
25.0 84.7
85.5 235.0
271.0 86.7 Example 5
(Copper cable)
Comparative Example 5
(Copper cable) 70
70 17.3
17.2 24.9
24.8 85.7
84.8 340.0
399.0 85.2 Example 6
(Copper cable)
Comparative Example 6
(Copper cable) 95
95 19.5
20.0 24.7
24.7 85.4
85.0 405.0
462.0 87.7

From the top, it can be seen that the copper-clad aluminum cables of Examples 1 to 6 according to the present invention exhibit 85.2 to 90.5% of current capacity compared to the copper cables of Comparative Examples 1 to 6, and thus arc welding can be sufficiently performed.

The copper clad aluminum lightweight arc welding cable 1 according to the present invention comprises a plurality of fine wires 21' drawn with a small wire diameter of 0.20±0.02mm, a wire clad with 85% aluminum and 15% copper in a conductor volume ratio, In the embodiment shown in FIG. 2, 7 strands (7 strands) of thin wires are aggregated, and the assembly lines 21 are, for example, 7 strands (7 strands) to 19 strands (19 strands) as shown in FIG. ) Is twisted at an appropriate pitch, and a paper or nonwoven fabric having a thickness of 0.075 to 0.10 mm is wound as a separator on the outside, and then a sheath 4 is formed.

The sheath may be formed as a single layer that also serves as an insulator, or the insulator and the sheath may be formed separately.

As the insulator, extruded rubber (SE3) or chloroprene rubber (SE4) having a tensile strength of 7.0 N/mm2 or more is formed by extrusion with a single sheath to serve as a sheath, or an insulator of an extruded rubber mixture and a sheath of chloroprene rubber (SE4). It can also be coated with the composed composite coating.

A copper-clad aluminum cable with copper cladding on an aluminum core as a central conductor according to the present invention is lightweight and has good flexibility, so welding work and transportation are very simple, and the current capacity reaches 85.2~90.5% of the copper cable, so arc welding is sufficiently performed. can do.

The present invention can be used to reduce weight and reduce manufacturing cost by applying to cables for electric welding such as arc welding.

1: cable 2; Copper aluminum conductor
3: separator 4: sheath
21: assembly line 21': fine line
211: heartwood 212; Copper layer

Claims (5)

In the copper-clad aluminum lightweight arc welding cable in which a copper layer is integrally clad on the outside of an aluminum core conductor, and an exterior cladding layer is formed on the outside of the wires,
The wire rod includes an aluminum core having a purity of 99% or higher as a central conductor, and a plurality of fine wires 21' clad with copper having a purity of at least 99.9% outside the core member, and the aluminum core member and the copper layer are formed of the wire rod. Copper clad aluminum lightweight arc welding cable, characterized in that consisting of a volume ratio of 84 to 86% aluminum and 14% to 16% of the copper layer relative to the volume.
The method of claim 1,
The copper-clad aluminum wire is characterized in that it is formed of stranded wires 21 by assembling a plurality of fine wires 21' drawn with a small wire diameter of 0.20 ± 0.02 mm and twisting them at a preset pitch of 7 to 19 strands. Copper alloy aluminum lightweight arc welding cable.
The method of claim 2,
A copper-clad aluminum lightweight arc welding cable, characterized in that a separator is provided on the outside of the wire rod, and a single coating that serves as an insulator and sheath of an extruded rubber mixture is formed on the outside.
The method of claim 3,
The copper-clad aluminum lightweight arc welding cable, characterized in that the extruded rubber mixture as a single coating that serves as the insulator and the sheath is made of any one selected from extruded rubber (SE3) and chloroprene rubber (SE4) having a tensile strength of 7.0 N/mm 2 or more.
The method of claim 3,
The separator is a copper clad aluminum lightweight arc welding cable, characterized in that any one selected from a non-woven fabric and paper having a thickness of 0.075 ~ 0.10㎜.

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