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杨博, 邓佳荣, 刘新, 吕其兵. 钢轨交流闪光焊液桥爆破演化行为[J]. 焊接学报, 2024, 45(2): 105-112. DOI: 10.12073/j.hjxb.20230220001
引用本文: 杨博, 邓佳荣, 刘新, 吕其兵. 钢轨交流闪光焊液桥爆破演化行为[J]. 焊接学报, 2024, 45(2): 105-112. DOI: 10.12073/j.hjxb.20230220001
YANG Bo, DENG Jiarong, LIU Xin, LV Qibing. Liquid bridge blasting evolution behavior of rail AC flash welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2024, 45(2): 105-112. DOI: 10.12073/j.hjxb.20230220001
Citation: YANG Bo, DENG Jiarong, LIU Xin, LV Qibing. Liquid bridge blasting evolution behavior of rail AC flash welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2024, 45(2): 105-112. DOI: 10.12073/j.hjxb.20230220001

钢轨交流闪光焊液桥爆破演化行为

Liquid bridge blasting evolution behavior of rail AC flash welding

  • 摘要: 钢轨闪光焊接过程中焊件的加热、端面的保护、氧化物及污物的清除等都是由液桥的形成和爆破过程完成的. 该文分析液桥在焊接过程中的演化行为,对于理解钢轨闪光焊接过程,深入研究焊接加热与保护机理有重要作用. 通过特殊设计的钢轨接头和常规钢轨接头的闪光焊接试验,利用高速摄影采集钢轨交流闪光焊的液桥形成与爆破过程图像,并对图形进行计算与分析. 结果表明,液桥的形成和爆破时间处于毫秒级范围,产生大量有利于端面保护和液桥爆破的高压金属蒸气,爆破后的高温金属射流速度超过90 m/s;液桥在形成长大过程中在钢轨端面上动态移动,影响钢轨端面均匀加热;液桥爆破并不是在液桥初始形成的位置;焊接过程中熔体会出现“二次爆破”现象;不仅动端钢轨的送进能够形成液桥,端面熔融金属层的震荡也有利于形成液桥.

     

    Abstract: The heating of the weldment, the protection of the end face, the removal of oxides and dirt during the rail flash welding process are all caused by the formation and blasting process of the liquid bridge. This paper analyzing the evolution behavior of the liquid bridge during the welding process plays an important role in understanding the rail flash welding process and further studying the welding heating and protection mechanism. Through the flash welding test of specially designed rail joints and conventional rail joints, the liquid bridge formation and blasting process images of rail AC flash welding process were collected by high-speed photography, and the obtained graphics were calculated and analyzed. The research results show that the formation and blasting time of the liquid bridge is millisecond, which will generate a large amount of high-pressure metal vapor beneficial to the end face protection and liquid bridge blasting, and the high temperature metal jet velocity after blasting can reach more than 90 m/s; During the formation and growth of the liquid bridge, there will be dynamic movement on the rail end face that will affect the uniform heating of the rail end face. The liquid bridge blasting is not at the initial formation position of the liquid bridge; During the welding process, the melt can appear the phenomenon of "secondary explosion"; Not only can the rail at the moving end form a liquid bridge, but also the vibration of the molten metal layer at the end is conducive to the formation of a liquid bridge.

     

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