To improve the efficiency of heat transfer, usually in the tubes of the surface by adding fins, increasing heat transfer tube outer surface area (or internal surface area), so as to improve heat transfer efficiency purposes, such tubes called finned tube . Finned tube according to the shape and structure is divided into: square fin tubes, finned tubes, longitudinally finned tube, spiral serrated finned tube, finned tube; finned tube material into: single metal finned tubes, bimetal finned tube; finned tubes into different process: roll forming finned tubes, welded finned tubes, roll forming finned tubes, finned tubes forming suit. Shandong High German conduction produced by high-frequency welding finned tube has the following advantages: high frequency welding spiral finned tube is a new, wear-resistant, highly efficient heat transfer material, is an energy efficient heat transfer components, it uses the country class patented technology using high-frequency welding production process, high frequency power supply for the heat, the steel, steel pipe while heating to welded together into one, with a high heat transfer efficiency, heat dissipation area, long life, adapt to the temperature a wide range of characteristics to withstand higher pressures. Widely used in waste heat recovery, petrochemical, power station boilers, buses, civil building heating, cooling, pharmaceutical drying, wood drying, grain drying systems and other industries. Advantage of the high-frequency welding spiral finned tube 1. Installation is simple economics, the maximum length of the high-frequency welding spiral finned tube can reach six meters, reducing the connection point, making installation more economical, efficient, and reduce the probability of leakage at the connection. 2. Easy maintenance, high-frequency welding spiral finned tube after installation, basic maintenance is no longer required. 3. High-efficiency, high-frequency welding spiral finned tube and pipe wrapping Keys fins welded, heat dissipation area is more than eight times the light pipe, internal more smooth, the internal flow resistance. 4. Long life, fins and tubing combination of high mechanical strength, tensile strength of 200Mpa or more, all the inner and outer tubes hot galvanized. Weldable fin material: carbon steel, corrosion-resistant steel, stainless steel, alloy steel can be welded finned forms: real teeth, tooth open high-frequency welding spiral finned tube uses high-frequency welding spiral finned tube is a highly efficient heat transfer components . Its heat transfer area of ??the light pipe several times or more, heat transfer enhancement can reduce flow resistance, to reduce metal consumption, thereby improving the economy and operational reliability of heat transfer equipment. Currently, high-frequency welding spiral finned tube has been widely used in chemical, electric power, metallurgy, petrochemical, boiler, building materials, textile, environmental protection, drying, and medicine.