Copper Aluminum Connecting Pipe - High-Quality China Suppliers & Factory for HVAC Systems
Product Overview
A copper-aluminum connecting pipe, also known as a "copper-aluminum composite pipe" or "copper-aluminum transition pipe," is a specialized component used to connect copper and aluminum pipes in refrigeration, air conditioning, and heating systems. It's made of copper and aluminum at each end, respectively, and permanently joined in the middle using reliable processes such as friction welding or explosion welding.
Core Value: It solves the electrochemical corrosion problem that easily occurs when copper tubes and aluminum tubes are directly connected due to different potential differences, while providing an economical and efficient system connection solution.
Product Structure & Manufacturing Process
Structure Overview:
Used to connect the original copper pipe part of the system (such as compressor, valve and other interfaces).
Used to connect aluminum pipe sections in the system (such as evaporator and condenser coils).
The technical core requiring firm connection, good sealing, low resistivity, and high corrosion resistance.
Main Manufacturing Processes:
The most mainstream process. High-speed rotation generates frictional heat to achieve molecular metallurgical bonding under pressure. Features high strength, no flux, and zero pores.
Utilizes immense pressure at room temperature to force metal atoms to combine and form a reliable connection.
Uses explosive energy to drive metal plates to collide at high speed. Mostly used for plates, less common for pipes.
Product Features
Isolates the copper and aluminum from electrolytes (moisture/residual water) using specialized welding, preventing anode corrosion and joint leaks.
Friction welded joints approach parent material strength, easily withstanding system vibrations and pressure changes to prevent leaks.
Utilizing lightweight, cost-effective aluminum heat exchangers with transition pipes significantly lowers material costs and overall weight.
Both ends retain their original metal ductility and weldability, allowing for easy on-site flaring, bending, and welding.
Extend System Life: By eliminating corrosion and leakage at joint interfaces, the system achieves long-term stable operation with reduced maintenance frequency and lower overall costs.
Main Application Areas
Copper-aluminum connecting pipes serve as critical components in the following industries and systems:
- Household Air Conditioners: Standard configuration for connecting outdoor unit copper pipes to indoor unit aluminum heat exchangers.
- Refrigerators & Freezers: Connection between the compressor's copper tubing and the evaporator's aluminum tubing.
- Automobile Air Conditioning: Connects aluminum condensers and evaporators to the copper pipes of the system.
- Central Air Conditioning: Used in modules where aluminum heat exchangers are partially integrated.
- Solar Water Heaters and other specialized heat exchange equipment.
Technical Parameters
| Copper Tube Specs | Air Conditioning P-Number | Air Conditioning Model | Copper Pipe Diameter (mm) | English Specs |
|---|---|---|---|---|
| 6-10 | Small 1HP / 1HP / Large 1HP; Variable frequency small 1.5HP / 1.5HP / large 1.5HP | KF23/KF25/KF26/KF27/KFR23/KFR25/KFR26 | 6(6.35)*10(9.52) | 2-3 points |
| 6-12 | Small 1.5HP / 1.5HP / Large 1.5HP; Small 2HP / 2HP / Large 2HP | KF32/KF33/KF35/KF36/KF46/KF48/KF50/KF51/KFR32/KFR33/KFR35KFR46/KFR48/KFR50 | 6(6.35)*12(12.7) | 2-4 points |
| 6-16 | 3 small horses / 3 large horses; Variable frequency 3HP | KF60/KF70/KF71/KF72/KFR61/KFR70/KFR71 | 6(6.35)*16(15.87) | 2-5 points |
| 10-16 | 3 small horses / 3 large horses; Variable frequency 3HP | KF60/KF70/KF71/KF72/KFR61/KFR70/KFR71 | 10(9.52)*16(15.87) | 3-5 points |
Frequently Asked Questions (FAQ)
It is used to safely join copper and aluminum pipes in refrigeration, HVAC, and heating systems. It prevents electrochemical corrosion that occurs when these two metals are directly connected.
Direct contact of copper and aluminum in the presence of moisture creates a galvanic cell, causing the aluminum to corrode. The composite transition pipe uses a specialized welding process that seals the joint and isolates the metals from electrolytes, eliminating the corrosion path.
Friction welding uses high-speed rotation and pressure to create frictional heat, forming a molecular-level metallurgical bond. It is the most reliable method because it requires no flux, prevents pores or slag inclusions, and provides joint strength close to the parent metals.
Yes. Both the copper and aluminum ends retain the natural ductility and weldability of their respective metals, making it easy to perform flaring, bending, and welding on-site.
Aluminum is lighter and less expensive than copper. By using aluminum heat exchangers and connecting them via transition pipes, manufacturers can significantly reduce material costs and product weight without sacrificing connection integrity.