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On the basis of the characters of HG - II myriametre rail welder and thetechnological request of rail gas pressure welding in the field, a ra. 根据新技术标准和施工工艺特点,在客运专线铺轨基地建造了全自动的长钢轨焊接流水生产线,总结出了长钢轨闪光接触焊的施工关键技术。