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Cold pressure welding process for copper and aluminum

A welding process and cold-pressing technology, applied in the field of copper-aluminum cold-pressing welding process, can solve the problems of low efficiency, low production efficiency, unenvironmental protection, etc., and achieve the effect of high efficiency

Active Publication Date: 2012-06-13
SHANDONG YINGBO ELECTRIC POWER EQUIP
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AI Technical Summary

Problems solved by technology

Fast and reliable welding between copper and aluminum is currently a technical problem. To solve this technical problem, the following processes are currently used: using argon arc welding or special flux welding for the transition terminals of copper and aluminum bars, but there are many problems in these two methods. Such as: 1. The reliability of terminals made by flash welding or friction welding is not stable
2. The welding process consumes argon gas, which is not only not environmentally friendly, but also argon gas and welding arc light are harmful to the human body
3. The flux is expensive and the cost is too high
3. Due to the large heat generated during the welding process, cooling is required, and the production efficiency is low
[0007] Another solution that is more widely used is the welding method that uses friction combined with upsetting, which is less efficient and also requires cooling

Method used

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Embodiment Construction

[0020] This scheme is mainly used for cold pressure welding of copper and aluminum, corresponding to aluminum foil or copper foil, aluminum row or copper row, it is necessary to ensure that the surface of the workpiece or welding material is clean, free of oil and oxide film, so if there is a corresponding The surface quality condition needs to be dealt with accordingly. Since pure aluminum and pure copper are relatively easy to oxidize in the air, it is best to remove the oxide film before welding to ensure the quality of welding. Due to the relatively narrow application range, the corresponding welding materials are mainly aluminum and copper, and the application field is mainly transformer reactor-like foil-wound coils. Therefore, the pit depth or connection quality limited by the connection resistance has a better characterization effect. For different welding materials, different pit depths are required. When the connection object is determined, the pit depth can be obtai...

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Abstract

The invention discloses a cold pressure welding process for copper and aluminum. The process comprises the following steps of: matching clean plates which are stacked and clean foils which are needed to be welded on the plates, wherein the foils are arranged on the upper side, and positions to be welded are positioned on a smooth foundation; and pressing pits at the welding positions to form welding points by a pressure head which moves along the normal direction of the foundation, so that connecting resistance of the foils and the plates is less than or equal to that for fusion welding under the same condition. The cold pressure welding process for the copper and the aluminum is high in efficiency and good in cold welding effect.

Description

technical field [0001] The invention relates to a copper-aluminum cold-press welding process, which is mainly used in the field of foil-wound coils of transformer reactors. Background technique [0002] The connection of conductive parts in transformer coil products uses more foil winding technology. Due to abundant aluminum resources and low price, the coils of transformer reactors are usually wound with aluminum foil, and the lead wires are made of copper or aluminum bars. Fast and reliable welding between copper and aluminum is currently a technical problem. To solve this technical problem, the following processes are currently used: using argon arc welding or special flux welding for copper-aluminum row transition terminals, but there are many problems in these two methods. For example: 1. The reliability of terminals made by flash welding or friction welding is not stable. 2. The welding process consumes argon gas, which is not only not environmentally friendly, but a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/02B23K20/24
Inventor 周来田
Owner SHANDONG YINGBO ELECTRIC POWER EQUIP
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