1. Mechanical tube expansion method
Mechanical tube expanding method is to use refrigerator appliances or special tube expander to forcibly push the metal head whose inner diameter is smaller than the diameter of copper tube into the tube, so that the diameter of copper tube gradually increases. The advantage of mechanical tube expanding method is simple and easy to operate, but it requires special tools and equipment.
2. Welding flaring method
Welding flaring method is to put the copper tube into the mold, weld the two ends and enlarge the diameter of the copper tube, so as to increase the diameter of the copper tube. This method is more suitable for welding both ends of copper tube, and the operation is relatively simple.
3. Thermal expansion method
The hot tube expanding method is to heat the copper tube at high temperature, and then expand the diameter of the copper tube through a special tube expanding tool to increase the diameter of the copper tube. This method requires professional knowledge and skills, because inexperienced people are easy to burn their fingers or palms during handling.
4. Hydraulic tube expanding method
Hydraulic tube expanding method is to put the copper tube into the inner tube expanding die with a hydraulic press, and then control the diameter increase of the copper tube through the pressure provided by the hydraulic press. This method is suitable for large copper pipes, but it needs special equipment and environment.
No matter what expansion method is adopted, it is necessary to carefully check whether the copper tube can play a better role and confirm its safety. Therefore, it is necessary to pay attention to safety when using the tube expanding method, such as using heat-resistant protective gloves and breathing apparatus.