Welding of copper and copper alloys
Release time:
2022-08-02
【Summary Description】 Weldability of copper and copper alloys 1. The high thermal conductivity of copper. At room temperature, the thermal conductivity of copper is about 8 times larger than that of carbon steel. It is difficult to heat the copper weldment locally to the melting temperature, so the energy concentrated heat source should be used during welding. 2. Copper and copper alloy welding often cracks. The location of cracks in the weld, fusion line and heat affected zone. The fracture is intergranular failure, and obvious oxidation color can be seen from the cross section. In the process of welding crystallization, a small amount of oxygen and copper form Cu2O, and form a low melting point eutectic (α Cu2O) with α copper, and its melting point is 1064 ℃. Lead is insoluble in solid copper, and lead and copper form a low melting point eutectic with a melting point of about 326 ℃. Under the action of welding internal stress, cracks are formed in the fragile parts of the welded joints of copper and copper alloy joints at high temperatures. In addition, hydrogen in the weld can also cause cracks. 3. Pores often occur in welds of copper and copper alloys. Porosity in pure copper weld metal is mainly caused by hydrogen. When CO gas is dissolved in pure copper, pores may also be caused by water vapor and CO2 gas generated by the reaction of carbon monoxide and oxygen. The tendency of pore formation during welding of copper alloys is much greater than that of pure copper. Generally, the pores are distributed in the center of the weld and near the fusion line. 4. When welding pure copper and copper alloy, there is a tendency to reduce the mechanical properties of the joint. In the welding process of copper alloy, the oxidation of copper and the evaporation and burning of alloying elements will occur. Low melting point eutectic and various welding defects lead to the decrease of strength, plasticity, corrosion resistance and electrical conductivity of welded joints. Welding method of copper and copper alloy There are many welding methods for copper and copper alloys, such as gas welding, carbon arc welding, welding rod manual welding, tungsten argon arc welding, submerged arc welding, plasma welding, etc. They have different applications, and must be selected according to the type of copper and copper alloy, the thickness of the weldment, the shape of the product structure, the production conditions, the welding productivity, the quality requirements of the joint, etc.
Weldability of copper and copper alloys
1. The high thermal conductivity of copper. At room temperature, the thermal conductivity of copper is about 8 times larger than that of carbon steel. It is difficult to heat the copper weldment locally to the melting temperature, so the energy concentrated heat source should be used during welding.
2. Copper and copper alloy welding often cracks. The location of cracks in the weld, fusion line and heat affected zone. The fracture is intergranular failure, and obvious oxidation color can be seen from the cross section.
In the process of welding crystallization, a small amount of oxygen and copper form Cu2O, and form a low melting point eutectic (α Cu2O) with α copper, and its melting point is 1064 ℃. Lead is insoluble in solid copper, and lead and copper form a low melting point eutectic with a melting point of about 326 ℃. Under the action of welding internal stress, cracks are formed in the fragile parts of the welded joints of copper and copper alloy joints at high temperatures. In addition, hydrogen in the weld can also cause cracks.
3. Pores often occur in welds of copper and copper alloys. Porosity in pure copper weld metal is mainly caused by hydrogen. When CO gas is dissolved in pure copper, pores may also be caused by water vapor and CO2 gas generated by the reaction of carbon monoxide and oxygen.
The tendency of pore formation during welding of copper alloys is much greater than that of pure copper. Generally, the pores are distributed in the center of the weld and near the fusion line.
4. When welding pure copper and copper alloy, there is a tendency to reduce the mechanical properties of the joint. In the welding process of copper alloy, the oxidation of copper and the evaporation and burning of alloying elements will occur. Low melting point eutectic and various welding defects lead to the decrease of strength, plasticity, corrosion resistance and electrical conductivity of welded joints.
Welding method of copper and copper alloy
There are many welding methods for copper and copper alloys, such as gas welding, carbon arc welding, welding rod manual welding, tungsten argon arc welding, submerged arc welding, plasma welding, etc. They have different applications, and must be selected according to the type of copper and copper alloy, the thickness of the weldment, the shape of the product structure, the production conditions, the welding productivity, the quality requirements of the joint, etc.
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