YUHONG GROUP - Manufacture of High Frequency Welded spiral Fin Tube

High-frequency resistance welding finned tube is a product formed by welding a steel strip onto a steel tube by using the resistance heat generated by the high-frequency current flowing through the surface of the workpiece and applying the top forging force.

The main advantages of high frequency welded finned tubes:

①High production efficiency, can be continuous winding production;
② low cost, it relies on the characteristics of high-frequency welding itself - skin effect heating the surface of the workpiece to achieve the purpose of welding, welding process without adding any filler metal materials;
③ As the high-frequency current only in the shallow surface of the steel pipe through the welding heat-affected zone is small, so the design calculations, do not need to take into account the wall thickness caused by the additional amount; the workpiece does not need to be welded after heat treatment;
④ Welding is reliable, in the case of reasonable equipment configuration, perfect process parameters, can be achieved between the fins and steel welded firmly, can withstand frequent start and stop the thermal shock caused by fluctuations. Because of the above advantages of high-frequency welded finned tube, it is increasingly used in petroleum, chemical, electric power and other industries in the new heat transfer element, to strengthen the heat transfer outside the tube, improve the efficiency of heat recovery, energy saving and consumption reduction purposes.

Principle of high-frequency welded finned tube:

The basis of high-frequency welding is the use of high-frequency current of the two main effects: skin effect and neighbourhood effect, with the help of high-frequency current skin effect can make high-frequency electric energy concentrated in the surface layer of the workpiece, and the use of the neighbourhood effect can be controlled by high-frequency current flow of the location and scope. When the requirements of high-frequency current concentrated in a certain part of the workpiece, in the skin effect and the role of the neighbourhood effect, adjacent to the two sides of the end of the metal will be rapidly heated to the melting or welding temperature, and then in the role of the applied pressure, the two parts can be firmly welded into a whole.