Thermatool CFI series solid state HF induction welders are the most advanced, reliable, field-proven induction welders available in the world today. With more than two decades of success in solid state welding technology,......Thermatool CFI series solid state HF induction welders are the most advanced, reliable, field-proven induction welders available in the world today. With more than two decades of success in solid state welding technology, Thermatool is the only true global induction welder manufacturer able to offer specialist process application knowledge gained from over 50 years of experience within the tube and pipe welding industry.