Welding process of copper stranded cable

Abstract

The invention provides a welding process of a copper stranded cable. The welding process comprises the following procedures: cutting off the cable; fixing and binding end parts; carrying out hot-pressing molding; welding; and cleaning. In the hot-pressing molding procedure, a pressure shaping process is adopted at a high temperature, namely, the fixedly bound end parts are heated to about 800 DEGC by an oxygen torch, and then the end parts are pressed by hammering with an iron hammer or other tools to form an oblate or semicircular shape or other shapes for facilitating the end parts to be welded with a welding connection piece. By means of the process, an ideal shape of the end parts of the cable can be obtained for the welded section of the cable, thus ideal welding quality can be obtained; and welding addition materials can be saved.

Description

【Technical field】 [0001] The invention relates to a manufacturing process of a transformer, in particular to a welding process of copper multi-strand cables. 【Background technique】 [0002] There are a lot of copper multi-strand cable welding problems in the manufacturing process of transformers, such as the welding of cables and copper plate lugs, the welding of cables and cables, and the welding of cables and winding heads. According to the general transformer production process, phosphor copper gas welding is mostly used. The method is to cut off the cable, fix and bind the ends and then weld them. This welding process has the following disadvantages: [0003] 1. Due to the influence of the circular section of the cable, the contact surface with other welding connectors is small (especially large-size cables), which easily leads to an increase in the current density of the contact surface; [0004] 2. Since the cross-section of the cable is circular, the end of the cabl...

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Problems solved by technology

[0003] 1. Due to the influence of the circular section of the cable, the contact surface with other welding connectors is small (especially large-size cables), which easily leads to an increase in the current density of the contact surface;

[0004] 2. Since the cross-section of the cable is circular, the end of the cable is easy to loose after being cut off, and there is a certain stress. It is not easy to set the shape during welding, and it is easy to produce local protrusions, burrs, etc.;

[0005] 3. The loose single cable core is infiltrated by welding phosphor copper, which is easily brittle and broken, resulting in potential suspension;

[0006] 4. Due to the influence of loose ends, more welding materials need to be consumed

This method is mainly to solve the problem of butt welding of cable stranded conductors formed by twisting multiple copper or aluminum single wires, and is not suitable for welding cables and other welding connectors such as copper plate lugs. In addition, the compression of this method Requires a complete set of compression dies corresponding to the diameter of the cable's stranded conductors, resulting in increased welding costs

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