耐蚀钢轨U68CuCr闪光焊工艺研究

耐蚀钢轨U68CuCr是新研发的钢轨品种,通过对预热闪光焊接工艺研究,制定出100m耐蚀钢轨闪光焊接工艺。根据试验结果可以得出,当焊接热输入量在6 600~6 700kJ,预热达到10次,预热峰值短路电流71.3kA,短路时间3~4s,快闪时间1.2~1.5s,顶锻力达到420kN,顶锻量为11~12mm,焊接总耗时130s,焊接后的钢轨焊头各项性能满足TB/T 1632-2005《钢轨焊接》的要求。按照该闪光焊工艺焊接的钢轨,已在京广铁路上使用。

Study on flash butt welding process of corrosion resistance rail U68CuCr

Corrosion resistance rail U68CuCr is a new product of rail.The flash butt welding process of 100 m corrosion resistance rail was confirmed via study on the process of preheat flash butt welding.It could be drawn a conclusion that when the heat input of welding was 6 600-6 700 kJ,the number of preheat was 10,the peak of preheat short-circuit current 7 1 .3 kA,the time of short circuit 3-4 s,the rapid flash time 1 .2-1.5 s,the force of forge up to 420 kN,the distance of forge 11-12 mm,and total time of welding 130 s.The performance index of welding joint was satisfied with TB/T 1632-2005＂welding of rail＂.The rail welded by this flash butt welding process has been used in j ing-guang railway.