A Welding Process of Aluminum Flat Wire and Copper Stranded Wire for Oil-immersed Distribution Transformer Products

Abstract

The invention discloses a welding process of aluminum flat wires and copper stranded wires for oil-immersed distribution transformer products, which belongs to the technical field of transformers and includes: 1. preparing transitional copper bars; 2. removing insulating paper at the welding ends of copper stranded wires; 3. According to the cross-sectional area of ​​the aluminum flat wire and the transitional copper bar, calculate the lap length during welding; 4. Remove the paint film in the area to be welded of the aluminum flat wire; 5. Make the ends of the copper stranded wire welded together; 6. One end of the transitional copper bar is placed on the platform to heat, and the phosphor copper electrode is melted on the overlapping surface of the transitional copper bar and the copper stranded wire; 7. Place the copper stranded wire on the surface to be welded with the transitional copper bar and heat until the solder flows into the weld Filling; 8. Place the other end of the transitional copper bar on the platform, and melt the copper-aluminum welding wire on the overlapping surface of the transitional copper bar and the aluminum flat wire; 9. Place the aluminum flat wire on the surface welded with the transitional copper bar to heat Until the solder flows into the weld and fills it up; 10. Remove the welding slag and welding powder with the iron brush and plate file on the welding head, and finally wrap it with insulation.

Description

technical field [0001] The invention belongs to the technical field of transformers, and in particular relates to a welding process of aluminum flat wires and copper stranded wires for oil-immersed distribution transformer products. Background technique [0002] At present, the high and low voltage coils of traditional oil-immersed distribution transformer products are made of copper foil and wire, and because the voltage level of oil-immersed distribution transformer products is below 35kV, the cross-sectional area of ​​the wire rod is large, and the high-voltage coil lead wire and tap The switch needs to be connected by transition welding of copper stranded wires to ensure the flow cross section and product operation performance. First, use a welding torch to remove the paint film at the ends of the coil leads, and pre-weld the ends of the copper strands to be welded together with solder; secondly, start welding to preheat the coil leads, and when the leads are heated to a...

AI Technical Summary

Problems solved by technology

This process is only suitable for oil-immersed distribution transformers whose high and low voltage products are made of copper. At present, the market finds that some customers purchase oil-immersed distribution transformers whose high and low voltage coils are all aluminum. After the stranded wire is welded, it is connected to the tap changer. Since the welding melting points of copper and aluminum are different, and the welding process of copper stranded wire is prone to cracking or false welding, the welding problem of aluminum flat wire and copper stranded wire has become a market issue. The bottleneck of receiving orders for oil-immersed all-aluminum distribution transformer products, and it has brought certain difficulties to the development of the market in this field