As the name suggests, copper-aluminum welding is to connect aluminum and copper together through the welding process, but copper and aluminum are easily oxidized metals, so it is an international problem to solve the oxidation problem after welding.
Traditional methods of welding copper and aluminum:
1.Traditional adoptionHanging tin and molten tinWelding copper aluminum, but this method is not good forming, the welding strength is not high, and the melting point of tin is low, so it can no longer be welded to work in a high-temperature environment, so the tin hanging and molten soldering are only suitable for low temperature and small workpiece welding.
Fusion welding, friction welding, cold pressure welding, ** welding, electron beam welding, ultrasonic weldingWelding copper and aluminum by other welding methods is brittle, easy to produce cracks, and the weld is prone to porosity, and the workpiece will break after welding, which will break the conductor and leak the pipeline.
Flame brazing, furnace-in-furnace brazing, high-frequency brazingThe copper pipe and aluminum pipe are welded, and the joint is well formed, strong tensile resistance, conductivity and corrosion resistance, which is a relatively common copper and aluminum welding method on the market.
For flame brazing, furnace brazing, and high-frequency brazing, which one should be chosen, a comparison of economic benefits was made:
Summary:
Through comparison, it can be seen that the induction brazing process is equipped to reduce the dependence on manual technology, and the licensed flame welder can be replaced by ordinary operators, reducing the burden of safety and annual examination of the certificate on the enterprise. Although in small workpieces and few pipes, the advantages of induction brazing are not obvious. However, the induction brazing welding process is automatic welding of the equipment, and there is no need for manual operation, and another equipment can be operated by using the welding time, which can further increase the output.
Attached are the copper-aluminum brazing cases we have done: