钢轨焊接接头冲击吸收功统计与分析  

Statistics and analysis of impact energy of rail welded joints

作　　者：程亚萍[1] 高文会[2] 代韬[2] 倪峥嵘[2] 王东[1] 

机构地区：[1]中国铁道科学研究院,北京100081 [2]中国铁道科学研究院金属及化学研究所,北京100081

出　　处：《焊接技术》2017年第2期15-19,共5页Welding Technology

摘　　要：统计与分析了U71Mn和U75V系列钢轨接头的室温冲击吸收功性能及规律,系统全面地了解了钢轨焊接接头冲击性能特点,可为焊接工艺制订规范和质量控制提供参考依据。统计与分析结果表明:铝热焊、移动焊、固定焊和气压焊接头冲击吸收功的平均值分别为4,14.1,13.8,14.1 J,铝热焊接头的韧性最差,闪光焊和气压焊相当;不同焊接方法不同系列钢轨(除气压焊外)的冲击吸收功平均值轨头>轨底>轨腰;气压焊接头冲击吸收功平均值轨底>轨头>轨腰;轨腰由于脆性夹杂物、疏松、偏析等缺陷原因冲击吸收功最低。U71Mn和U75V系列钢轨焊接接头全断面各部位的冲击吸收功变化规律相似,距离钢轨断面对称中心线越近,冲击吸收功越低。The room temperature impact properties of U71 Mn and U75 V welded joints were analyzed and introduced comprehensively in this paper, It could be provided reference basis for the formulation and quality control of welding process. The results showed that the average values of the impact energy of thermit welding, mobile flash-butt welding, stationary flash-butt welding and gas pressure welding joints were 4, 14.1, 13.8, 14.1 J. The toughness of thermit welding joint was the worst, the toughness of flash butt welding was the same as that of gas pressure welding.The average value of rail head of impact energy of different welding methods( except gas pressure welding) was better than rail base, rail waist was worst. While for gas pressure welding, rail base was better than rail head, rail waist was also worst. Because of the defects such as brittle inclusion, porosity and segregation, the impact energy of rail waist was lowest. The impact properties of U71 Mn and U75 V welded joints of all parts of the whole section was similar, the closer distance from the center line of rail profile was, the lower the impact energy was.

关 键 词：焊接接头 冲击吸收功 铝热焊 闪光焊 气压焊 

分 类 号：TG142.1[一般工业技术—材料科学与工程]