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Method of welding copper aluminum composite material conductor and copper leads

A technology of copper-aluminum composite material and welding method, which is applied in connection, line/collector parts, electrical components, etc., can solve the problems of reduced tensile strength and elongation at wire joints, affecting the mechanical properties and conductivity of wires, etc. , to achieve the effect of preventing electrochemical corrosion and solving technical problems

Inactive Publication Date: 2009-06-24
QINGDAO QINGBO TRANSFORMER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the temperature rises or stays at a higher temperature for a long time, the brittle intermetallic compound CuAl is easily formed on the copper and aluminum contact surface of the copper-aluminum composite wire joint. 2 , so that the tensile strength and elongation of the copper-aluminum composite wire joints are reduced, which affects the mechanical properties and electrical conductivity of the wire

Method used

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  • Method of welding copper aluminum composite material conductor and copper leads
  • Method of welding copper aluminum composite material conductor and copper leads

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] According to welding method described in the present invention, carry out following steps:

[0023] First, according to the section of the cable or coil outlet, select the appropriate die and wiring bobbin 1, the punch is installed on the piston head of the cylinder, the die is fixed on the frame of the cylinder, and the punch and die correspond to each other. Then the hydraulic cylinder frame is placed outside the wiring barrel 1 or the wiring terminal 3, and its position is such that the distance between the edge of the formed pit and the proximal end of the wiring barrel 1 is 5-8 mm.

[0024] For cold pressure welding of flat wires, the angle between the plane of the pit formed and the width plane of the flat copper wire is controlled at 45 to 75°, and cold pressure welding perpendicular to the large plane of the wire is not allowed.

[0025] Then, control the distance between the edge of the pressure pit to be formed and the end of the terminal bobbin 1 or terminal ...

Embodiment 2

[0027] The above-mentioned cold rolling welding can also be used for the connection between the low-voltage lead wire and the copper bar. Due to the large cross-section of the low-voltage leads, the same steps as in Example 1 are used to cold-press connect the multiple outlets of the same coil to multiple terminals with double holes, and then drill holes in the appropriate positions of the low-voltage copper bars to connect several low-voltage leads. Terminals and copper bars are connected by bolts.

Embodiment 3

[0029] Carry out cold pressure welding to STL series connection terminal, the cold pressure method is the same as embodiment 1. After the combination of A and B, a total of 3 hexagon socket bolts are connected. Two positive and one reverse are required, that is, two hexagon socket bolt heads are on one side, and the other is on the other side. Tighten and tighten.

[0030] Applying the method described in the present invention to weld the copper-aluminum composite wire and the copper lead wire can make the copper-aluminum composite material wire and the copper lead wire firmly butt, and effectively prevent electrochemical corrosion at the interface, so that the copper-aluminum composite material can be welded Wires are used in winding transformer windings and other application fields to provide technical support and solve technical problems in the connection of wires.

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Abstract

The invention discloses a welding method for jointing contacts of copper-aluminum composite material lead wires and copper down-lead wires in an abutting way; the method comprises the following steps: firstly, proper die mold and a connecting bobbin are selected; a punching mold is arranged above a piston head of a cold press welder, and a cavity mold is fixed above a cylinder body frame of the cold press welder, then the fluid cylinder frame is arranged at the proper position outside the connecting bobbin or a connecting terminal in a supporting way; the distance of the press pit edge and the end part of the connecting bobbin or the connecting terminal is controlled, a hydraulic pump is started for pressurizing, after the pointer of a pressure gauge points at the position meeting the requirements, the pressurizing is stopped; then, the lead wires are plugged in the central position of the connecting bobbin from the other end, and then the cold pressure welding is carried out. By adopting the welding method, the copper-aluminum composite material lead wires and copper down-lead wires are firmly abutting-jointed, and electrochemical corrosion can be effectively prevented at the contact position.

Description

Technical field [0001] The invention relates to a welding method of a copper-aluminum composite wire and a copper lead, in particular to a cold-press welding method of a copper-aluminum composite wire and a copper lead. Background technique [0002] Copper has unique physical and electrical properties, is a traditional conductive material, and is also the main raw material for transformer windings. Due to the lack of copper resources in the world and the high market price, the electrical industry is actively seeking alternative materials. It is generally believed that aluminum wire is a better substitute material. Due to the abundant resources of aluminum, it has the advantages of low price, light weight, and high conductivity. Therefore, in the 1960s, "substituting aluminum for copper" was proposed, and aluminum wires were used as power transmission lines, including the production of transformer windings. With the development of bimetallic composite material technology, p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01R43/02
Inventor 冯斌纪巧葛连彬高扬
Owner QINGDAO QINGBO TRANSFORMER
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