Caracterização macro e microestrutural e levantamendo do perfil de dureza da região da solda e afetada pela solda de trilhos com diferentes perfis de desgaste soldados por aluminotermia

Abstract

The national railway industry has constantly searched for the raise of transported loads, demanding that the rails bear an increasing amount of stresses. That demand has required in-depth studies of the wheel-rail contact, specially on the points where most of the failure happens: welded joints. Knowing the importance of knowing better the parameters and the processes related to aluminothermic welding, this research is conducted partnered with VALE S.A, to understand the conditions that allow a better final quality of the aluminothermic welding in railway rails with different wear profiles or with different heights used for Heavy Haul, since the greater occurrence of welding carried out in existing railroads happens in this way. The main goal of this research of the characteristics of aluminothermic welding and all the factors that can influence its performance, in addition to metallographic and hardness profiles of weld sample carried out on the Carajás Railroad, to ensure a weld of rails with different wear profiles with better quality and reliability.