Elbow finned tube for custom heat exchanger

After the two edges of the finned tube and the steel tube to be welded are heated to the welding temperature under compressive force, welding is performed; therefore, the welding pressure on the finned tube significantly affects weld quality. If the welding pressure is too high, the molten metal from the finned tube will be entirely squeezed out of the weld zone, resulting in poor welds and, in severe cases, causing fin buckling and compromising the finned tube’s shape and dimensions. Conversely, if the welding pressure is too low, oxides and inclusions in the weld zone cannot be adequately expelled, leading to slag inclusions and defective welds.

After the two edges of the finned tube and the steel tube to be welded are heated to the welding temperature under compressive force, welding is performed; therefore, the welding pressure on the finned tube significantly affects weld quality. If the welding pressure is too high, the molten metal from the finned tube will be entirely squeezed out of the weld zone, resulting in poor welds and, in severe cases, causing fin buckling, which degrades the finned tube’s shape and dimensions. Conversely, if the welding pressure is too low, oxides and inclusions in the weld zone cannot be adequately expelled, leading to slag inclusions and compromised weld integrity. 
Due to the unique characteristics of high-frequency resistance welding for finned tubes, the heating, welding, and cooling rates are all very rapid, resulting in a narrow heat-affected zone and eliminating common defects associated with fusion welding, such as porosity and segregation. You’re likely already familiar with finned‑tube products. However, if you’d like to deepen your knowledge, we’ll continue exploring this topic below—providing you with valuable insights to enhance your understanding of these products. 
1. After fins are added to a finned tube, is it still considered a finned tube? 
Once the fluorescent tube passes through the fins, it becomes a finned tube; therefore, the answer to this question is yes—there is no doubt about that. However, adding fins on the air side does enhance heat transfer. That said, under certain conditions, some issues may arise. 
2. When designing finned tubes, are there any specific parameters that need to be known? 
When designing finned tubes, it is necessary to know several detailed parameters, such as fin height, fin thickness, and fin pitch. In addition, there may be other factors to consider. However, the first three are certainly well‑known and clearly defined, as they are critical parameters that cannot be omitted. 
3. What are the main factors that determine the price of copper–aluminum composite finned tubes? 
The price of copper–aluminum composite finned tubes is primarily determined by the tube model and brand, among other factors. Therefore, when making a purchase, it’s essential to take these two aspects into account; otherwise, you may end up choosing the wrong product, resulting in unnecessary expenses.

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