The whole set of 800kW Solid State HF Welder is composed of switchgear rectifying cabinet(Fig.1), inverter output cabinet(Fig.2), circulation soft water cooling system(Fig.3), central operation console(Fig.4), 2-D(for induction welding) & 3-D(for contact welding) positioning table(Fig.5) and connecting optical fiber. 1. Application Range (for reference)Steel pipe size: Round pipe: φ165 φ355mm