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Copper alloy: copper and copper alloy welding some skills and types


Release time:

2021-09-02

Welding Technology of Copper and Copper Alloys 1. The thermal conductivity of copper is very high. The thermal conductivity of copper at room temperature is about 8 times higher than that of carbon steel. It is difficult for copper welding components to be locally heated to melting temperature, so energy-concentrated heat source is used during welding. 2. The welding of copper and copper alloy often cracks, the location of the cracks in the welding, welding line and heat affected zone, the crack is grain boundary damage, the section can be seen obvious oxidation color.

Copper alloy: copper and copper alloy welding some skills and types

Copper alloy: Here to popularize some copper and copper alloy welding skills and welding knowledge

Welding Technology of Copper and Copper Alloys

1. The thermal conductivity of copper is very high. The thermal conductivity of copper at room temperature is about 8 times higher than that of carbon steel. It is difficult for copper welding components to be locally heated to melting temperature, so energy-concentrated heat source is used during welding.

2. The welding of copper and copper alloy often cracks, the location of the cracks in the welding, welding line and heat affected zone, the crack is grain boundary damage, the section can be seen obvious oxidation color.

In welding, trace oxygen forms Cu2O with copper and low melting point eutectic (Cu2O) with copper. Its melting point is 1064. Lead is insoluble in solid copper. Lead and copper form low melting point eutectic with a melting point of about 326. Due to the stress in welding, cracks are formed in the fragile part of the welded joint. In addition, hydrogen in welding may also lead to cracks.

3. The welding part of copper and copper alloy often produces pores. The pores in pure copper welding metal are mainly caused by hydrogen. If CO gas is dissolved in pure copper, CO2 gas generated by the reaction of water vapor and oxygen may also cause pores. The formation trend of pores during copper alloy welding is much larger than that of pure copper. Generally, the pores are distributed in the welding center and near the welding line.

4. When welding pure copper or copper alloy, the mechanical properties of the joint have a downward trend. During the welding process of copper alloy, the oxidation of copper and the evaporation and burning of alloying elements will occur. The low melting point eutectic and various welding defects will lead to The strength, plasticity, corrosion resistance and conductivity of the welded joint are reduced.

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Welding knowledge of copper and copper alloys

Copper has excellent electrical conductivity, thermal conductivity, corrosion resistance, ductility and a certain strength and other characteristics, widely used in motor windings, in pure copper (copper) to add alloying elements, the formation of a solid solution of various copper alloys, such as zinc really? nickel-doped white copper, silicon-doped bronze, aluminum-doped bronze and so on.

There are four main elements that affect the weldability of copper and copper alloys.

One is the influence of high thermal conductivity, the thermal conductivity of copper is 7 to 11 times larger than that of carbon steel, and when the same process parameters are used to weld the same thickness of carbon steel, the copper material is not easy to melt, and the filler metal and the base material cannot be smoothly fused.

Second, the tendency of hot cracking of welded joints is large. When welding, the copper in the molten pool and the impurities in it form a low melting point eutectic, which makes the copper and copper alloy have obvious hot brittleness and produces hot cracks.

Third, the defects produced by pores are more serious than those of carbon steel, as well as hydrogen pores.

Four is the change of welding joint performance, grain coarsening, plastic reduction, corrosion resistance and so on.

What kind of cutting fluid should be used for copper alloy processing?

When selecting copper and copper alloy cutting fluid, attention must be paid to the corrosion of the cutting fluid to copper, and the grease and esters in the oily cutting fluid may cause discoloration of the components. When using water-based cutting fluid, please choose a cutting fluid resistant to hard water, and do not make the PH value too high. Cutting fluid containing active sulfur additive cannot be used. In addition, copper alloy corrosion inhibitor needs to be added to the cutting fluid to remove fines generated during cutting immediately, it is better to use the filter, otherwise, the copper chips are easy to react with some components in the cutting fluid, which will deteriorate the cutting fluid. Dongguan Keze Lubricating Oil has professional corresponding products, and we look forward to your understanding.

nantong moore new material science and technology limited company's main products are, watchband contact finger, spring contact finger, shaped plum contacts, composite watchband contact finger, copper alloy, copper alloy spring etc. Nantong Moore New Material Technology Co., Ltd. is developed from its predecessor Nantong Moore Electric Co., Ltd., which is an enterprise specializing in the design, development and research of high-strength and high-conductivity alloy materials and electrical connection products. Companies in the industry has achieved a high degree of recognition and reputation of the majority of customers. The company in line with professional advanced, pioneering spirit, set up rigorous and pragmatic, the basic concept. To do a product, cast a boutique for the purpose of the enterprise, and give full play to the characteristics of flexible and diverse enterprises, intentions to serve every customer.

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