High frequency induction welding machine can be used for straight seam welding of steel pipe. Its main characteristics are high switching frequency and high equipment power. The power devices are silicon MOSFET and silicon fast recovery diode.
Due to the characteristics of silicon-based power devices, the efficiency, capacity and cost of high frequency induction welding machine are restricted With the continuous maturity of silicon carbide power device technology, its performance characteristics are especially suitable for high-power high-frequency induction welding equipment Through the comparative analysis of the parameters of silicon and silicon carbide power devices, the main circuit of the existing series high-frequency induction welding machine is optimized by using silicon carbide power devices, and the SiC MOSFET driving circuit and power unit suitable for multi device parallel connection are designed Finally, a SiC MOSFET series high frequency induction welding machine prototype is built and tested The experimental results show that the performance and welding efficiency of the designed high-frequency induction welding machine are higher than those of the existing equipment.
