JPS6041151B2 - How to prevent corrosion at the joint between aluminum wire and copper stranded wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing corrosion at a joint between an aluminum wire and a stranded steel wire.

The joints between aluminum wires and stranded copper wires, which are joined together by welding, are susceptible to corrosion when moisture or the like enters, and the aluminum wires in particular are severely corroded, posing a problem in durability.

As a way to solve this problem, we installed PVC (PVC) on the external surface of the joint.
Some are coated with a vinyl chloride (vinyl chloride) type material.

That is, in this method, aluminum wire and copper stranded wire that are joined together are first heated to about 180 pm, and then immersed in a PVC-based material that is liquid at room temperature and solidifies when heated and dried. The heat of each of the wires gels the PVC material on the surface to form a gel-like coating, which is then heated and dried in a drying oven of approximately 23,000 units to form a solidified insulating coating on the surface of each wire. is formed. By the way, in this method, since one of the wires to be joined is a stranded wire, there is an internal gap in the stranded copper wire.
Since this gap remains as a void, moisture, etc. penetrates through the internal gap of the knotted wire and reaches the joint with the aluminum wire.
As expected, corrosion at the joints could not be avoided.

This invention attempts to completely prevent corrosion at the joint by infiltrating a shielding material (such as a PVC material) from the atmosphere into the internal voids of the joint in addition to covering the surface of each wire to be joined. It is.

The present invention will be explained below with reference to the drawings.

First, Figures a, b, and c show an aluminum wire and a copper stranded wire that are joined together by welding. with a line,
It is welded to the aluminum wire 1 at the joint A.
The steel stranded wire 2 has an internal gap B between each of the steel wires 2a. Aluminum wires 1 joined together in this way
and copper stranded wires 2 (at room temperature) are then immersed in the above-mentioned liquid PVC-based material, whereby the PVC-based material is poured into the internal void B along each copper wire 2a by capillary action as shown in FIG. The shield material 3 is penetrated and filled. At this time, if pressure is applied to the PVC material, the penetration into the internal void B will be further promoted by the press-fitting action. After the shield material (vinyl chloride material) 3 has penetrated into the internal gap B in this manner, it is heated to about 180° C. as in the conventional method.

By this heating, the vinyl chloride material in the internal cavity B is solidified. The heated aluminum wire 1 and stranded copper wire 2 are immersed again in a liquid vinyl chloride material, and the vinyl chloride material on the surface thereof is gelled to form a gel-like coating. The aluminum wire 1 and the copper stranded wire 2 on which this gel-like coating was formed are then heated and dried in a drying oven of approximately 23,000 liters, so that their surfaces are coated with solidified PVC as shown in Figure 3a and b. An outer coating material 3' of the system material is formed. Since the internal void B near the joint A is filled with the shielding material 3, it is possible to prevent moisture, etc. from penetrating through the internal void B.
Therefore, corrosion of the joint A can be prevented, so that the durability of the joint A increases.

Note that the inner shield material 3 and the outer coating material 3' are not limited to PVC-based materials, and various other materials can be used, and the inner shield material 3 only needs to be liquid when infiltrated, and does not necessarily need to be solidified. .

Furthermore, the joint location A between the aluminum wire 1 and the copper stranded wire 2 includes a joining method other than the welding described above. As described above, according to the present invention, prior to forming an insulating film on the surface of the joint between the aluminum wire and the copper stranded wire, a step of infiltrating the internal void of the joint of each wire with a substance that shields the atmosphere from the atmosphere at room temperature is carried out. By adding this, moisture and the like do not penetrate into the joint, which has the effect of improving the durability of the joint.

[Brief explanation of the drawing]

Figures 1 to 3 are diagrams used to explain the present invention.
Figures a, b, and c are front views, top views, and cross-sectional views of aluminum wires and copper stranded wires joined together; Figure 2 is a cross-sectional view of Figures a, b, and c filled with an internal shielding material; Figure 3a,
b is a front view and a sectional view of the structure shown in FIG. 2 with an outer coating material applied thereto; In the figure, 1 is an aluminum wire, 2 is a copper stranded wire, 3' is an outer coating material, 3 is an internal shield material, A is a joint, and B is an internal void. In each figure, the same reference numerals indicate the same parts.
Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. The step of immersing the aluminum wire and copper stranded wire that are joined together at room temperature in an insulating material that is liquid at room temperature and solidifies when heated, and allowing the above insulating material to penetrate into the internal voids of each wire at the joint location, and A step of heating the aluminum wire and copper stranded wire, which are joined and in which an insulating material has penetrated into the internal voids of each wire at the joint location, to a predetermined temperature to solidify the insulating material; A step of immersing each wire in an insulating material and gelling the insulating material on the surface of each wire using the heat of the wire to form a gel-like film, and heating and drying the aluminum wire and copper stranded wire on which the gel-like film has been formed. and forming a solidified insulating film on the surface of each of the wires.