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)

摘要： 分析了国内外高铁焊轨设备的发展历程，总结了中频逆变直流焊接技术的特点和优势，介绍了自主研发的中频逆变直流焊机的机械结构、逆变变压器以及控制系统。应用结果表明，自主研发的中频逆变直流焊机具有焊接电流密集、无明显的集肤效应、落锤合格率高等特点，相关性能持平国外先进水平，对高铁无缝钢轨的焊接具有重要的参考意义。

关键词: 高速铁路, 钢轨, 焊接, 中频逆变, 直流