This study proposes an alternative for the recovery of the crawler tractor bulldozer worn by the abrasive effect of the soil. To this end, deals with a comparative analysis between the wear resistance of an original track like two caterpillars, recovered by different processes. The first recovery process uses the application of a hairpiece in the region of wear and the second is the recovery of the region affected by welding deposition of a hard coating. The specimens were subjected to wear tests type rubber wheel (ASTM G 65-04), the microstructural analysis was performed through the use of techniques for analysis of optical microscopy (OM) and scanning electron microscopy (SEM). The microcut was the wear micromechanism predominant in welding deposition. While for other materials (with lower hardness and less wear resistance) shows the presence of plastic deformation. Was observed that the recovery process tracked using the electrode coating E-83.58 showed to be an alternative for this type of recovery.

Este estudio propone una alternativa para la recuperación de las orugas de tractores Bulldozer desgastadas por el efecto abrasivo del suelo. Para este fin, se aborda un análisis comparativo entre la resistencia al desgaste de una oruga original con dos orugas semejantes, recuperadas por procesos distintos. El primer proceso de recuperación utiliza la aplicación de un postizo en la región de desgaste y el segundo consiste de la recuperación de la región afectada mediante deposición por soldadura de un revestimiento duro. Las probetas fueron sometidas a ensayos de desgaste tipo rueda de caucho y chorro de arena seca (ASTM G 65-04); el análisis microestructural fue realizado por medio de la utilización de las técnicas de análisis de microscopia óptica (MO) y microscopia electrónica de barrido (SEM). Se obtiene como micromecanismo de desgaste predominante en la soldadura el microcorte, en tanto que para los demás materiales (ambos aceros) se observa deformación plástica y presencia de microsurcos. Fue posible observar que el proceso de recuperación de orugas utilizando el revestimiento con electrodo E-83.58 mostro ser una alternativa para este tipo de recuperación.

Neste trabalho estudou-se a perda de massa de revestimento duro aplicado pelo processo de soldagem com arame tubular com a variação de energia de soldagem, gás de proteção e número de camadas do revestimento. Com arame tubular autoprotegido de liga Fe-Cr-C-Ti foram depositados cordões sobrepostos na formação de camadas de revestimento sobre chapas de aço ao Carbono AISI 1020 para a análise da perda de massa, dureza, microestrutura. Foram realizadas medições de dureza na superfície dos corpos de prova de desgaste. Abrasômetro tipo roda de borracha foi usado para determinar a perda de massa dos revestimentos. Os revestimentos apresentaram microestrutura martensítica e austenita retida com carbonetos finamente dispersos na matriz. Os principais fatores que contribuíram para o aumento na perda de massa foram as trincas devido a maior taxa de resfriamento das amostras depositadas com baixa energia de soldagem, a diluição na primeira camada de todas as amostras também contribuiu para o aumento na perda de massa. As menores perdas de massa foram dos revestimentos de duas e quatro camadas depositados com alta energia de soldagem. A fração volumétrica de carbonetos de Titânio contribuiu para a diminuição do caminho livre médio entre as partículas de carbonetos aumentando a resistência ao desgaste dos revestimentos.

In this papper, have been studied the mass loss of hardfacing applied by flux cored arc welding. Heat input, shielding gás and number of layers coating were changed to application of Fe-Cr-Ti-C self-shielded tubular wire. Beads overlapped were deposited on plates of carbon steel AISI 1020 to analyze the mass loss, hardness and microstructure. For the analysis of mass loss were deposited beads forming overlapped layers coatings. Hardness measurements were performed on the surface of the specimens of wear. Rubber wheel abrasion tester was used to access the mass loss of coatings. The coatings had retained austenite and martensite microstructure with carbides finely dispersed in the matrix. The main factors that contributed to the increase in mass loss were the cracks due to higher cooling rate of the samples deposited with low heat input, the dilution in the first layer of all samples also contributed to the increase in mass loss. The smallest mass losses were those deposited coatings with high heat input the second and fourth layer, the samples AC2, AC4 and AS2. The volume fraction of titanium carbides contributed to the decrease in the mean free path between the particles of carbides increase the wear resistance of the coatings.