Resumo

ONOZ GUTIERREZ, Pablo; RODRIGUEZ PEREZ, Manuel  e  FADRAGA HERNANDEZ, Emerio. Electrode selection for recovery of the cylinder lids of the tgm8k locomitive engine. cen. az. [online]. 2017, vol.44, n.1, pp. 23-31. ISSN 2223-4861.

The objective of this work was to determine the best-suited electrode to carry out the recovery of cylinder lids (cylinders heads) of the TGM8K locomotives, by applying manual welding for electric arc. The test specimens of nodularcast iron, obtained from a discarded head, which were welded with two types electrodes, ENi-CI (UTP8 ) and ENiFe-CI ( UTP86FN ) following a technology of appropriate welding were prepared. The specimens were subject of thermic fatigue tests in an experimental installation created with this purpose, in which a process of heating and more severe cooling than in the head working conditions was simulated. During the thermic fatigue tests, in the specimens welded with electrodes ENi-CI appeared cracks at the thermic influence zone after 145 cycles, while in the specimens welded with electrodes ENiFe-CI, appeared at the 585 cycles on average. Based on the study results, the authors conclude that ENiFe-CI electrodes are the best-suited for the recovery of the cylinder lids.

Palavras-chave : electrodes; recovery; welding; cylinder lid; cast iron; thermic fatigue.

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