高海拔环境下钢轨铝热焊预热工艺研究  

Study on Preheating Technology of Rail Thermit Welding in High Altitude Environment

作　　者：高松福 任金雷 石孟雷 李政 宋宏图 GAO Songfu;REN Jinlei;SHI Menglei;LI Zheng;SONG Hongtu(Metals and Chemistry Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司金属及化学研究所,北京100081

出　　处：《高速铁路新材料》2024年第2期61-64,共4页Advanced Materials of High Speed Railway

基　　金：中国铁道科学研究院集团有限公司研发中心基金项目(J2021G010)。

摘　　要：通过制作钢轨铝热焊预热测温试验模型,研究了海拔高度对预热气体质量流量和预热温度的影响。试验结果表明:采用相同的预热气体压力时,高海拔环境下预热气体质量流量减少,导致钢轨的预热温度增加缓慢,影响预热效果。为保证与平原地区相近的预热效果,高海拔环境下应采用较高的预热气体压力。高海拔环境下进行钢轨铝热焊接时,采用调整气体压力后的预热工艺,焊接接头性能满足TB/T 1632.3—2019《钢轨焊接第3部分:铝热焊接》技术要求及现场验收要求。The effect of altitude on preheating gas flow rate and preheating temperature was studied by making preheating experimental model.The results of preheating test show that the output flow of preheating gas decreases at high altitude.The preheating temperature of rail increases slowly due to less gas output at high altitude,which affects the preheating effect.In order to ensure the preheating effect similar to that in the plain area,high preheating gas pressure should be adopted at high altitude.The preheating process after adjusting gas pressure should be adopted to meet the requirements of TB/T 1632.3—2019 standards and on site joints inspection.

关 键 词：钢轨焊接 铝热焊 预热工艺 预热温度 

分 类 号：TG457.1[金属学及工艺—焊接]