What are the characteristics of G-type finned tubes?

　　What are the characteristics of G‑type finned tubes, and how should you select them?

G-type finned tubes are being increasingly widely adopted due to their advantages. However, limitations… G-type finned tube Another factor influencing openness is their production cost. Several factors affect production costs, but, on the one hand, as long as production technologies are advanced, the associated costs will naturally decrease.

　　G‑type finned tubes are a type of electron tube and serve as high‑output‑impedance voltage‑boosting components. Thin‑walled tubes and contact‑welded joints employ current‑heating welding processes, which require low‑impedance input power supplies. Consequently, when the impedances of the two devices are mismatched, it becomes difficult to deliver higher output power. Only by adjusting the proportion of the oscillation circuit and appropriately repositioning the contacts can satisfactory output be achieved.

　　G‑type finned tubes provide the baseline power consumption; therefore, reducing standby time will save energy and, in turn, lower production costs. G-type finned tube The actual standby time during production exceeds 50%. Employing high-performance equipment can significantly reduce standby time, thereby increasing output and lowering costs. For the same type of strip steel, the likelihood of fracture zones is influenced by the weld structure. When a G‑type finned tube experiences jumping, it is also cushioned by a spring; the elastic potential energy is proportional to the square of the displacement. A 5 mm change in displacement results in a 25‑fold variation in casting energy, making the strip prone to breakage and increasing the risk of damage to the pressure rollers. In contrast, pneumatic systems lack springs and rely primarily on gas pressure to generate the casting force; thus, when a G‑type finned tube jumps, it is buffered by air pressure.

　　The four welding methods for G-type finned tubes are as follows:

　　1. Resistance welding method: After cleaning and polishing the tube wall, apply a layer of flux, then slip the fins onto the tube. Next, energize both ends of the G‑type finned tube; the high current will melt the metal in the flux, thereby welding the tube to the fins.

　　II. Dip‑coating method. The metallic coatings are primarily zinc and tin, with cadmium used less frequently. Prior to dipping, the tubes and fins undergo chemical treatment to remove surface oxides and oils. Nickel‑molybdenum alloy steels are cleaned with hydrochloric acid, sulfuric acid, and oxidizing agents; carbon steels are cleaned with cold hydrochloric acid and hot dilute sulfuric acid; copper fins may be cleaned only with dilute sulfuric acid. G‑type finned tubes, after being contaminated with oil, are treated with an ammonium chloride solution containing stannous chloride and can then be immersed in a molten zinc bath.

　　3. Spot welding. During fin‑tube assembly, select the appropriate arc welder and seam welder to join the fins to the tubes. To prevent tube deformation during welding, a mandrel is typically used. With this process, the perforated portion of the fin is folded over to facilitate welding.

4. Tube-expanding method. Connect the G-type finned tube to the corresponding pressurization equipment, and use hydraulic pressure to expand the tube passage, thereby… G-type finned tube Tightly clamped onto the pipe.