In order to better meet the requirements of rails with high wear resistance on heavy haul railways such as Daqin and Shuohuang

Panzhihua Iron and Steel Group has developed 1330 MPa high-wear-resistant U95Cr hypereutectoid rails.Reliable

stable and efficient welding technology is urgently needed in site rail welding construction. In this paper

experimental studies on welding and normalizing process of 75N U95Cr rails were carried out by the GPW-1200 digital control gas pressure welding machine. The results show that the hardness of U95Cr welded joints with this set of process parameters（The first stage: Acetylene/oxygen 111/107 SLM

welding heating for 270 s; the second stage: Acetylene/oxygen 92/87 SLM

welding heating for 90 s） meets the requirements of "Technical Conditions for Gas Pressure Welding of High-Wear-Resistance

High-Strength-Toughness Hypereutectoid Rails for Trial Laying Tests"

and the drop weight

static bending

fatigue

tensile

impact

metallographic and grain size meet the requirements of TB/T1632.4 "Gas Pressure Welding". The performance of the gas pressure welding joints is stable and reliable

which is equivalent to the performance of the flash welding joints.