Resumo

RAMIREZ-CRUZ, José Luis et al. Fatigue crack growth of mig welded carbon steel. Ingeniería Mecánica [online]. 2018, vol.21, n.3, pp. 167-172. ISSN 1815-5944.

In this paper are presented the results of a research work on the propagation of fatigue cracks in structural steel plate, subjected to a MIG welding process. The study was conducted on structural steel (ASTM std.) used in the manufacture of structures of rectangular tubular profile (PTR) for 2 x 1inch 2-mm thick, MIG welded and not welded. Samples were tested for fatigue crack propagation at the base material and welded metal. The results show a crack arrest in the heat affected zone (HAZ) , requiring greater amplitude of the stress intensity factor (KI) for the propagation of the crack in a stable manner. Results indicate that the combination of adequate microstructure and residual stresses in the HAZ are the main factors which can stop the advance of the crack in welded material.

Palavras-chave : crack growth; fatigue; fracture mechanics; MIG welding.

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