U75V钢轨闪光焊工艺研究
Study on Flash-butt Welding Process for U75V Rail
丁 韦1， 宋宏图1， 骆德阳2， 刘艳红1
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作者单位：（1.中国铁道科学研究院 金属及化学研究所，北京 100081；2.西南交通大学 工程科学研究院，四川 成都 610031）
中文关键字：U75V钢轨；闪光焊；工艺研究
英文关键字：U75V rail; flash-butt welding; process research
中文摘要：介绍了钢轨连续和脉动闪光焊接工艺。脉动闪光工艺的有效热输入大，有利于降低落锤断口灰斑，适合焊接U75V钢轨。为获得有效加热，脉动闪光工艺参数必须根据加热钢轨接触电阻变化，对焊接参数分多段进行独立调节，确保不发生长时间短路或快速烧化。
英文摘要：Continuous and pulse flash-butt rail welding process was introduced. The effective thermal input of pulse flash process is large, it can help reduce the drop weight test fracture of flat spot, which is suitable for welding U75V rail. In order to obtain an effective heating, pulse flashing process parameters must change based on rail contact resistance. To adjust heated in stages independently, can ensure the nonoccurrence of no long time short circuit or rapid flashing.