智能化移动热轧钢轨气压焊接及其焊后热处理工艺研究  

Research on Gas Pressure Welding and Post-weld Heat Treatment Process of Intelligent Moving Hot-rolled Rail

作　　者：张静[1] ZHANG Jing(Baoji Vocational and Technical College,Baoji Shaanxi 721013,China)

机构地区：[1]宝鸡职业技术学院,陕西宝鸡721013

出　　处：《粘接》2020年第10期18-21,共4页Adhesion

摘　　要：通过台达HMI、可编程序控制器、焊后热处理控制系统,基于工艺参数全面智能化钢轨气压焊接及其焊后热处理。其中详细分析了焊接工作系统、焊接工艺与焊后热处理,进行了焊缝组织特性分析、硬度与淬火温度临界点测定。结果表明,U75V与U71Mn热轧钢轨焊缝区域冷却到500℃状态下,重新正火加热,温度上升到800℃后及时熄灭,开始淬火热处理,温度保持在575℃状态之下最佳,时间则应超出185s最佳,这样一来,便可转变组织,实现轨头轨面硬度与母材之间高度匹配,以此为焊后热处理选取最优加热温度与时间奠定坚实的理论基础,进而保障钢轨接头质量与热处理效果稳定性、可靠性。Through the Delta HMI,programmable controller,post-weld heat treatment control system,based on the process parameters fully intelligent steel rail gas pressure welding and its post-weld heat treatment.Among them,the welding working system,welding process and post-welding heat treatment are analyzed in detail,and the weld structure characteristics analysis,hardness and quenching temperature critical point are determined.The results show that the weld zone of U75V and U71Mn hot rolled rail is cooled to 500℃,then heated by normalizing,the temperature rises to 800℃and then extinguished in time,the heat treatment is started,the temperature is kept optimum at 575℃and the time should be better than 185s,in this way,the structure can be changed and the hardness of rail surface and the height of base metal can be matched,which can lay a solid theoretical foundation for selecting the optimal heating temperature and time after welding,and then ensure the stability and reliability of rail joint quality and heat treatment effect.

关 键 词：智能化 热轧钢轨 气压焊接 热处理工艺 

分 类 号：U213.92[交通运输工程—道路与铁道工程] TG457.11[金属学及工艺—焊接]