Nssw solid induction hf welding unit (hf welder) suitable for continuous production of longitudinal welded tube and pipe production lines. Components of the equipment : nssw-solid state induction hf welder composing ofscr dc powersupply, hf inverter and water cooling unit(air-water-or water heat exchanger) major parameters : power supply ac three-phase 380v420v, 50hz60z,75kva-1500kva (different input voltage and frequency can also be arranged)