The welding knowledge of copper and copper alloy is clearly understood in this article.
Release time:
2022-11-10
【Summary Description】 How to weld copper and copper alloy? There are many difficulties in welding copper and copper alloy, because its thermal conductivity is particularly good, so it is easy to cause defects such as incomplete penetration and poor fusion. After welding, the deformation of the workpiece will be very large, and the weld and fusion zone are prone to cracks and a large number of pores. The mechanical properties of the joint, especially the plasticity and toughness, are lower than those of the base metal. Copper can be welded by gas welding, but the efficiency is too low, the deformation is large, and it must be preheated to above 400°C, and the working conditions are not good. Manual arc welding can use copper 107 or copper 227 electrode, with DC reverse connection as the power supply, the arc is as small as possible, and the straight-line round-trip transportation is adopted to improve the weld formation. Hammer the weld after welding to improve the quality of the weld. If TIG welding is used, a high-quality welded joint can be obtained and the deformation of the weldment can be reduced. The welding wire 201 for the welding wire, such as the copper wire T2, must be matched with the flux 301. The power supply adopts DC positive connection. Welding workpieces and welding wires should be carefully cleaned to reduce porosity and slag inclusions. High current and high speed should be used for welding. Gas welding is usually used for welding brass. The welding wire 221, the welding wire 222, or the welding wire 224 may be used as the welding wire. These wires contain silicon, tin, iron and other elements, which can reduce the burning loss of zinc in the molten pool. Due to the low temperature of gas welding, the burning loss of zinc in brass can be reduced; a layer of zinc oxide film is covered on the surface of the molten pool with a mild oxidation flame, which can reduce the evaporation of zinc. In addition, brass can also be welded by manual arc welding and tungsten argon arc welding.
How to weld copper and copper alloy?
There are many difficulties in welding copper and copper alloy, because its thermal conductivity is particularly good, so it is easy to cause defects such as incomplete penetration and poor fusion. After welding, the deformation of the workpiece will be very large, and the weld and fusion zone are prone to cracks and a large number of pores. The mechanical properties of the joint, especially the plasticity and toughness, are lower than those of the base metal. Copper can be welded by gas welding, but the efficiency is too low, the deformation is large, and it must be preheated to above 400°C, and the working conditions are not good. Manual arc welding can use copper 107 or copper 227 electrode, with DC reverse connection as the power supply, the arc is as small as possible, and the straight-line round-trip transportation is adopted to improve the weld formation. Hammer the weld after welding to improve the quality of the weld. If TIG welding is used, a high-quality welded joint can be obtained and the deformation of the weldment can be reduced. The welding wire 201 for the welding wire, such as the copper wire T2, must be matched with the flux 301. The power supply adopts DC positive connection. Welding workpieces and welding wires should be carefully cleaned to reduce porosity and slag inclusions. High current and high speed should be used for welding.
Gas welding is usually used for welding brass. The welding wire 221, the welding wire 222, or the welding wire 224 may be used as the welding wire. These wires contain silicon, tin, iron and other elements, which can reduce the burning loss of zinc in the molten pool. Due to the low temperature of gas welding, the burning loss of zinc in brass can be reduced; a layer of zinc oxide film is covered on the surface of the molten pool with a mild oxidation flame, which can reduce the evaporation of zinc. In addition, brass can also be welded by manual arc welding and tungsten argon arc welding.
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