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High Ductility Cold-Rolled Ribbed Steel Bar Induction Heating Generator. Optimal technology to solve Load-Matching of the welder. High efficiency and energy conservation, power supply efficiency of the HF welder increase by more than 10%. Safety and Reliability improved, the withstand voltage of Si-MOS device is 1200V, the rated DC voltage of HF welder is 500V, and the power factor at the grid side is up to 0.95.