钢轨闪光焊接工艺与接头落锤试验分析
Study on flash butt welding process of rail and joint hammer impact test
-
摘要: 试验采用YHG-1200TH型移动式钢轨闪光焊机，焊接武钢60 kg/m U71Mn G热轧态钢轨.通过观察分析焊接曲线中闪平、脉动闪光、加速闪光与顶锻保压各阶段电流、电压、钢轨位移、压力等因素，结合接头落锤试验情况，调整并优选出合理工艺参数；分析焊接热输入与顶锻量间的搭配关系及接头抗落锤次数，观察断口与接头显微组织.结果表明，试验用钢轨闪光焊接热输入在11.5~12.5 MJ之间且顶锻量在15~16 mm之间时，接头抗落锤情况较集中，质量稳定性好；合理工艺参数焊接且经落锤检验合格的接头断口无明显缺陷，焊缝及热影响区组织为珠光体和少量铁素体，未见马氏体、贝氏体组织或其它缺陷.Abstract: The U71Mn G hot rolled rail from Wuhan Iron and Steel(Group) Company was welded by flash butt welding using weld machine of model# YHG-1200TH. By analyzing the variation of welding current, voltages, displacement, pressure etc., in the welding process with respect to those factors including pre-flash, pulse flash, accelerating flash and upset forging, and combined with the hammer impact test, the study aimed to optimize the welding process parameters. Then analysis on the relations between welding heat input, upset forging and impact numbers was performed. The joint fractured surface and the microstructure were also observed. The study specifically approved that when welding heat input located between 11.5 to 12.5 MJ and upset forging length was inside 15~16 mm, the welded joint can perform well in the hammer impact tests,with good quality and consistency. The fractured surface of the joint welded in optimized parameters had no obvious defects. The microstructure of the weld the heat affected zone are pearlite with a small proportion of ferrite, No martensite, bainite or other defects was found in the weld structure.
-
Keywords:
- flash butt welding /
- heat input /
- upset forging length /
- hammer impact test /
- microstructure
-
-
[1] 丁 韦, 白国庆, 李 力, 等. 移动式钢轨闪光焊设备及工艺[J]. 铁道建筑, 2010(2): 106-108. Ding Wei, Bai Guoqing, Li Li, et al. Mobile rail flash welding equipment and technology[J]. Railway Engineering, 2010(2): 106-108. [2] 丁 韦, 李 力, 宋宏图, 等. 移动式槽型钢轨闪光焊接设备研发及焊接工艺研究[J]. 焊接技术, 2015, 44(6): 22-25. Ding Wei, Li Li, Song Hongtu, et al. Research on the development and welding technology of flash welding equipment of mobile groove type rail[J]. Welding Technology, 2015, 44(6): 22-25. [3] 高文会, 高东海, 周清跃, 等. TB1632/T-2014钢轨焊接第1部分:通用技术条件[S]. 北京: 中国铁道出版社, 2015. [4] 张银花, 周清跃, 陈朝阳, 等. 钢轨闪光焊焊接接头轨面横向裂纹成因分析[J]. 中国铁道科学, 2006, 27(1): 61-65. Zhang Yinhua, Zhou Qingyue, Cheng Zhaoyang, et al. Research on transversal cracks in the trend of flash welding joints of rails[J]. China Railway Science, 2006, 27(1): 61-65. -
期刊类型引用(8)
1. 唐佑绵，丁向阳，文勇亮，葛秋波. 闪光焊焊接过程热效率与接头落锤试验性能研究. 铁道建筑. 2022(02): 53-56 . 
百度学术
2. 张英利. 一种采用现场焊接人工铺设500 m长钢轨的施工新技术. 建筑技术. 2021(10): 1262-1265 . 百度学术
3. 黎伟. 钢轨闪光焊接灰斑分析与控制. 大型铸锻件. 2020(02): 49-51 . 百度学术
4. 于红昱，孙昭藩. YHG-1200移动闪光焊现场施工工艺探讨. 科技创新导报. 2019(05): 58-59 . 百度学术
5. 陆鑫，李大东，王若愚，邓建. 焊接工艺对钢轨闪光焊接头性能的影响. 焊接. 2019(12): 50-55+68 . 百度学术
6. 王东，高文会，代韬，倪峥嵘，程亚萍. 钢轨固定式闪光焊接头静弯试验及与落锤试验相关性分析. 铁道建筑. 2018(02): 129-133 . 百度学术
7. 张铭达. GAAS80/580焊机工艺参数设置对U71Mn钢轨焊接质量的影响. 铁道建筑. 2018(12): 139-142 . 百度学术
8. 贺颂. U78CrV钢轨移动式闪光焊接工艺优化. 焊接. 2018(12): 51-54+68 . 百度学术
其他类型引用(4)
计量
- 文章访问数: 427
- HTML全文浏览量: 45
- PDF下载量: 138
- 被引次数: 12
下载:
