关键词: 高速铁路, 钢轨, 焊接, 中频逆变, 直流

Abstract: The development of high-speed rail welding equipment at home and abroad was analyzed herein. The characteristics and advantages of MF inverter DC welding technology were summarized, and the mechanical structures, inverter transformers and control systems of the self-developed MF inverter DC welding machine and the product tests were introduced. The results show that the MF inverter DC welding machine developed by the project has the characteristics of dense welding currents, no obvious skin effects and high drop rates. The relevant performances are the same as that of abroad advanced levels, which have important reference significances for the welding of high-speed rail seamless rails.

Key words: high-speed rail, rail, welding, medium frequency（MF） inverter, direct current(DC)