Copper and Aluminum Brazing
Client Needs:
1. Welding of copper tube and aluminum joint;
2. The diameter of the joint is 22.5mm;
3. The welding time is less than 20s
What is Copper-Aluminum Welding?
Copper-aluminum welding is the welding of copper and aluminum materials into one body through a welding process. Because both copper and aluminum are easily oxidized metals, the welding of copper and aluminum has always been an international welding problem.
Analysis of Common Copper-Aluminum Welding Process
1)Traditionally, the methods of hanging tin and melting tin are commonly used to weld copper and aluminum, but this method is not good in shape and does not have very good strength. Due to the low melting point of tin and can not weld the workpiece under high temperature, this process is only Suitable for use on small workpieces under low temperature conditions and difficult to apply to the production of other products.
2)Use fusion welding, friction welding, cold pressure welding, explosive welding, electron beam welding, ultrasonic welding and other welding methods to weld copper and aluminum. The welded joints are brittle, prone to cracks and the welds are prone to porosity. The welded workpiece Fractures are easy to cause the conductor to break and the pipeline to leak, so the effect required in actual production is often not achieved.
3)Use flame brazing, furnace brazing and high-frequency brazing to weld copper and aluminum together, and use brazing filler metal as an intermediate medium to weld copper and aluminum together. After brazing, the joints are better formed, tensile and shear resistance, conductivity and corrosion resistance are better. It is currently the commonly used copper-aluminum welding method on the market. Comparison of high frequency brazing, flame brazing, and furnace brazing Process type Equipment investment Difficulty of use The cost Maintenance cost product quality High frequency brazing Low Low lowest Low excellent Flame brazing Low high middle Low good Brazing in the furnace high middle Highest high excellent.
Comparison of high frequency brazing, flame brazing, and furnace brazing | |||||
Process type | Equipment investment | Difficulty of use | The cost | Maintenance cost | product quality |
High frequency brazing | Low | Low | lowest | Low | excellent |
Flame brazing | Low | high | middle | low | good |
Brazing in the furnace | high | good | Highest | high | excellent |
Advantages of Induction Brazing:
1)There is no open flame in the induction brazing process, which is efficient and safe.
2)Induction brazing has high heating efficiency, and the welding can be completed within a few seconds.
3)Induction brazing is easy to operate and can be operated by ordinary operators, without the need for professional skilled personnel; 4. Induction brazing has high consistency and is not limited by the level of welding personnel, and can be produced in batches with high quality.
4)Induction brazing saves electric energy, and the average welding work consumes 7-12 degrees per hour.
5)Induction brazing can be automated, with automatic loading and unloading, automatic wire feeding or automatic collar, it can fully realize welding automation.