Spiral finned tubes can be manufactured in several ways. Finned tubes used in boilers, pressure vessels and other heat exchange equipment mainly include the following manufacturing methods: high-frequency resistance welding spiral finned tubes, brazed spiral finned tubes and integral tube with helical fins.
High Frequency Welded Spiral Finned Tube
Spiral finned tubeHigh-frequency welding is to introduce high-power high-frequency current into the welded workpiece and use the resistance heat generated by the current to pass through the contact surface of the welded workpiece and the adjacent area to make the surface of welding contact reaches fusion or semi-fusion plasticity. and then apply appropriate pressure to the welding contact surface to complete the welding of the finned tube.
Welded Spiral Fin Tubes
The brazing spiral finned tube is filled with a kind of brazing material with a lower melting point than that of the brazed part, and then heated to the brazing temperature. When the welded part does not melt, the brazing material melts and wets the braze. However, the brazing joint is formed by diffusion at the contact of the welded part, thus completing the welding of the spiral finned tube.
Integral tube with spiral fins
Helical finned integral helical tube is an integral helical finned tube that is formed by simultaneously extruding and rolling a thick-walled tube (tube blank) under the condition of continuous heating at intermediate frequency. It is the latest method of manufacturing finned tube. A domestic company has already applied for a patent for self-made integral finned drum and integral finned tube manufacturing equipment.
