Effect of Welding Polarity on Mechanical Properties of Submerged Arc Welded Railway Vehicle Wheels

When a railway vehicle moves on curved rail, sliding contact between the rail head side and wheel flange causes wear flange. Traditionally, with thinned is machined to get minimum thickness specified for structural safety. This operation reduces rim shortens life of wheel. In present study, flanges were hard-faced by submerged arc welding. A welding wire, which has good weldability base material does not generate thermal cracking, was developed. The effects polarity microstructure, hardness, friction coefficient, characteristics welded studied. hardness reverse similar that straight polarity. rates disc its counterpart 11% 27% lower than those Delamination due subsurface crack propagation oxidation mixed. before test in range 250–300 HV. After test, it soared 500