Multilayer surfacing of a freight car wheel Rim

For a radical solution to the issue of extending the service life of wheelsets of the freight cars, it is proposed to weld not only serviceable wheels but also wheels to be pressed against an unacceptable rim thickness. It is shown that in multilayer surfacing, the possibility of obtaining high quality metal becomes more difficult, and heating of a thin rim can harm the gap between the inner surfaces of the wheels. Experimental surfacing was carried out on the optimal parameters of the multi-electrode process, and a method for measuring the value of wheel warping in conditions of multilayer surfacing was proposed. The results of studies on the influence of the multi-electrode surfacing process on the metal structure and wheel warping are presented. It is shown that under the optimal surfacing mode, favorable conditions are created for obtaining fine-grained structures in the near-seamed zone. It was found that wheel warping does not cause any dangers that threaten traffic safety. The weld metal has the necessary resistance to cracking under the action of operational loads.