The purpose of the copper bar and the reason why it is not suitable for fusion welding
Copper bar and copper braided wire is also a high current conductive product, it can be applied to high and low voltage electrical appliances, switch contacts, distribution equipment, busbar trough and other electrical engineering in addition, is also widely used in metal smelting, electrochemical plating, chemical caustic soda and other large current electrolytic smelting projects.
Copper bar is made of copper material, rectangular or chamfered rectangular section of long conductor, with low resistivity, large bending degree and other advantages, in the circuit to transport current and connect electrical equipment role. Under normal circumstances, copper bar manufacturers do not recommend using copper as welding, but also because many characteristics of copper itself determine that it is not suitable for melt welding.
The reason why the copper bar is not recommended to use melting welding is mainly because the presence of impurities is easy to add low-melting eutectic in the weld, making the joint easy to crack; Moreover, copper itself has a high melting point and excellent thermal conductivity, which makes the base metal difficult to melt when fused, and the filler metal and the base metal are difficult to integrate well, resulting in non-penetration phenomenon.
Even if the copper bar can be melted and welded, it can also be found that the grain size is very large after welding, resulting in a great reduction in the strength and plasticity of the joint; Especially when the impurity element is added, it will also reduce the conductivity of the copper bar joint and affect its normal use effect.
In addition, copper has excellent thermal conductivity and the cooling speed of the weld is faster, so the porosity is also one of the main difficulties in the melting welding of copper. In addition, the coefficient of linear expansion and shrinkage of copper is large, the copper bar will be deformed badly after welding, the appearance is difficult to form, and the residual force is large.
Copper bar is made of copper material, rectangular or chamfered rectangular section of long conductor, with low resistivity, large bending degree and other advantages, in the circuit to transport current and connect electrical equipment role. Under normal circumstances, copper bar manufacturers do not recommend using copper as welding, but also because many characteristics of copper itself determine that it is not suitable for melt welding.
The reason why the copper bar is not recommended to use melting welding is mainly because the presence of impurities is easy to add low-melting eutectic in the weld, making the joint easy to crack; Moreover, copper itself has a high melting point and excellent thermal conductivity, which makes the base metal difficult to melt when fused, and the filler metal and the base metal are difficult to integrate well, resulting in non-penetration phenomenon.
Even if the copper bar can be melted and welded, it can also be found that the grain size is very large after welding, resulting in a great reduction in the strength and plasticity of the joint; Especially when the impurity element is added, it will also reduce the conductivity of the copper bar joint and affect its normal use effect.
In addition, copper has excellent thermal conductivity and the cooling speed of the weld is faster, so the porosity is also one of the main difficulties in the melting welding of copper. In addition, the coefficient of linear expansion and shrinkage of copper is large, the copper bar will be deformed badly after welding, the appearance is difficult to form, and the residual force is large.
