Laser welded finned tubes are mainly used for civil wall hanging and industrial boilers in the process of use. Foreign technologies are mainly used for operation. Its main advantages are that the contact thermal resistance is zero, the whole equipment is welded at high frequency, the winging rate is large, the weight is light, the assembled heat exchanger is compact, the energy efficiency is high, and the emission requirements are met.
When laser welded finned tubes are manufactured, there are many kinds of finned tubes in China. If high-frequency welding finned tubes are mainly used during operation, it has more advantages in product quality and production automation than inlaying, brazing and other methods. However, because the root of high-frequency welded finned tubes is difficult to penetrate and there are wrinkles at the root, there are many shortcomings in the heat exchange efficiency and preventing gray accumulation of high-frequency welded finned tubes. In view of the above reasons, there are policies for energy conservation and emission reduction.
Benefits of using laser to weld finned tubes
1. The thickness of the base tube can be 0.8-1.5mm, and the thickness of the pin in operation can be 0.3-1mm. Compared with other process costs during operation, the material cost can be greatly reduced.
2. The laser welded finned tube has a high welding joint ratio, which can prevent the corrosion in the working time gap, effectively extend the service life and reduce the heat conduction resistance.
3. When laser welding fin tube breaks through the material limit, other materials shall be used for processing.
4. The laser welded finned tube is easy to be processed for the second time, and the coil and elbow can be directly processed.
5. The welding heat affected zone is small and the metallographic change is small, so it is allowed to process small diameter finned tubes.
Rematerials of heat exchange tubes and condensation tubes shall have heat transfer performance, corrosion resistance, corrosion resistance, wear resistance, strong strength, strong plasticity and easy processing.
