电焊机2018，Vol.48Issue(3)：9-17,9.DOI:10.7512/j.issn.1001-2303.2018.03.02
高速列车转向架用耐寒焊丝研制及接头组织性能
Development of cold-resistant solid wire and microstructure of high speed train bogies
朱藤辉 1刘丽 1王高见 1康丹丹1
作者信息
- 1. 四川西冶新材料股份有限公司,四川成都611730
- 折叠
摘要
Abstract
To ensure the safe and reliable operation of high-speed trains,the welded joints of bogies must have the ability to serve in wide area,such as the extremely cold regions of Northeast China and Russia.Therefore,it is increasingly important to develop the welding material for bogie with cold resistant and high toughness.In this paper,a new type of 55G Ⅱ solid wire with high cold resistant and toughness was developed by using microalloying design.The transition behavior of droplets was observed by using high speed phase system.The mechanical properties of weld metal were tested and the fracture morphology of the specimens were observed by scanning electron microscope (SEM).Besides,the corrosion resistance and fatigue limit of the weld metal were studied.The results showed that,the newly developed solid wire has excellent arc stability under 250 A and 150 A current conditions,such as short circuiting or breaking times and small spatter particles.The microstructure of the weld metal is mainly composed of bainite,pearlite and ferrite.The maximum impact energy at-40 ℃ is 129 J while the average one is 96 J at-60 ℃.The weight loss of 1 000 h alternate immersion corrosion is 3.56％ and the fatigue limit of the welded joint is 374 MPa through 1×107 cycles under the 4 stress level.关键词
转向架焊丝/疲劳性能/力学性能/断口形貌/腐蚀失重比Key words
bogie welding wire/fatigue performance/mechanical property/fracture morphology/corrosion weight loss ratio分类
交通工程引用本文复制引用
朱藤辉,刘丽,王高见,康丹丹..高速列车转向架用耐寒焊丝研制及接头组织性能[J].电焊机,2018,48(3):9-17,9.
