High frequency resistance welding spiral finned tubes are manufactured by importing high frequency current into the welded parts. The resistance heat generated by the current through the contact surface of the welded joints and adjacent areas brings the contact surface to a plastic state of melting or semi-melting. Appropriate pressure is then applied to complete the welding process.

• Increased heat transfer area within limited space for improved heat transfer efficiency
• Reduced space requirements for heat transfer surfaces, particularly beneficial for fast-loading boilers
• Lower equipment costs while enhancing operational safety
• Reduced water side pressure drop leading to lower operating costs
• Enhanced tube stiffness and improved seismic resistance