Different welding methods and performance characteristics of copper-copper alloy
Release time:
2022-11-05
【Summary Description】 Copper-copper alloys can be joined by processes such as brazing, resistance welding, etc. With the development of industry, the welding application of copper is more and more frequent, and the welding method has occupied a dominant position. Copper and copper alloys are easily welded by electrode arc welding, TIG welding and MIG welding. Copper has excellent electrical conductivity, thermal conductivity, corrosion resistance, ductility and certain strength. Widely used in electrical, electronics, chemical, food, electricity, transportation and aerospace industries. More than 10 kinds of alloying elements are added to pure copper (copper) to form various copper alloys with solid solutions, such as adding zinc to brass; Nickel is added in the form of white copper; Silicon is added to silicon bronze; Aluminum is aluminum bronze and so on. There are four main technical difficulties affecting the weldability of copper and copper alloys: first, the effect of high thermal conductivity. The thermal conductivity of copper is 7-11 times higher than that of carbon steel. When the process parameters used are similar to those of welding carbon steel with the same thickness, the copper material is difficult to melt, and the filler metal and the base metal cannot be fused well. Two is the welding joint hot cracking tendency. During welding, copper and impurities in the molten pool form a low melting point eutectic, which makes copper and copper alloys have obvious thermal brittleness, resulting in thermal cracking. Third, the defects that produce pores are much more serious than carbon steel, mainly hydrogen pores. Fourth, the change of welded joint performance. Grain coarsening, plasticity reduction, corrosion resistance reduction, etc.
Copper-copper alloys can be joined by processes such as brazing, resistance welding, etc. With the development of industry, the welding application of copper is more and more frequent, and the welding method has occupied a dominant position. Copper and copper alloys are easily welded by electrode arc welding, TIG welding and MIG welding.
Copper has excellent electrical conductivity, thermal conductivity, corrosion resistance, ductility and certain strength. Widely used in electrical, electronics, chemical, food, electricity, transportation and aerospace industries. More than 10 kinds of alloying elements are added to pure copper (copper) to form various copper alloys with solid solutions, such as adding zinc to brass; Nickel is added in the form of white copper; Silicon is added to silicon bronze; Aluminum is aluminum bronze and so on.
There are four main technical difficulties affecting the weldability of copper and copper alloys: first, the effect of high thermal conductivity. The thermal conductivity of copper is 7-11 times higher than that of carbon steel. When the process parameters used are similar to those of welding carbon steel with the same thickness, the copper material is difficult to melt, and the filler metal and the base metal cannot be fused well. Two is the welding joint hot cracking tendency. During welding, copper and impurities in the molten pool form a low melting point eutectic, which makes copper and copper alloys have obvious thermal brittleness, resulting in thermal cracking. Third, the defects that produce pores are much more serious than carbon steel, mainly hydrogen pores. Fourth, the change of welded joint performance. Grain coarsening, plasticity reduction, corrosion resistance reduction, etc.
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