Increasing the endurance of railways

6th ModTech International Conference - Modern Technologies in Industrial Engineering

Garleanu, G.^1 ; Gsrleanu, D.^1 ; Borda, C.^1 ; Popovici, V.^1 ; Gheorghian, A.T.^2

University Politehnica of Bucharest, Department of Materials Technology and Welding, CE 205, Splaiul Independenei nr.313, Bucharest, Romania^1

University Politehnica of Bucharest, Department of Thermodynamics, Motors, Heating and Refrigeration Equipment, CG 008, Splaiul Independenei nr.313, Bucharest, Romania^2

关键词: Additive materials;    Contact pressures;    Innovative technology;    Mechanized welding;    Metal structures;    Rolling friction;    Specific defects;    Welding structure;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/400/6/062010/pdf
DOI  :  10.1088/1757-899X/400/6/062010

来源: IOP

【 摘 要 】

The paper presents an innovative technology for increasing the endurance in the operation of the railway by mechanized loading with welding and an optimization for the choice of addition material using finite element method - FEM. In the first part of the paper there are presented specific defects of the railway paths and the loading technology by welding with different materials. Load technology is based on a mechanized welding installation that successively deposits welds on the horizontal running surface. The welding process chosen is of MAG type with tubular wire with/without protection gas. The welding length is 24 m. They are presented metallography, welding structures and hardness values depending on the additive material used. In the second part of the paper there is presented a FEM modelling of the welded layer for each used material. The values of the obtained mechanical properties, hardness, tensile strength, resilience, were compared with the real properties. In this way, one can predict the values that can be obtained both in the deposited layer and in the base metal. Depending on the type of stress, contact pressure, travel speed, rolling friction, etc. it is possible to make an optimal choice of the addition material meaning mechanical properties - price - endurance. there is no possibility of access for the operator; thermodynamics - heat exchangers, indifferent of the type of construction, with pipes, plates or spirals; Industrial plants - pipeline; metal structures of any kind - bridges, boats, halls, buildings; automotive industry - construction or repair.