Resumo

JAMES, M.N.  e  BIGHAM, K.. Fatigue strength of shafts reclaimed by welding. R&D j. (Matieland, Online) [online]. 1994, vol.10, pp.7-11. ISSN 2309-8988.

Reclamation of components by welding is well established, and considerable work has been done previously on the fatigue strength of built-up shafts. The general conclusion of this work was that the fatigue strength was generally lower for a built-up shaft, although some work has claimed that mild steel shafts could give the same strength as the base metal if care is taken in welding. However, control of welding processes has improved over the last 20 years and welding consumables have been subject to ongoing development. Equally, for the case of cracked shafts, thick layers of weld metal may now be deposited. These factors have prompted a reassessment of the current situation, and the present study indicates that normalised medium carbon steels may show a higher fatigue strength than the base metal after weld build up, whilst quenched and tempered higher alloy steels may show only a small reduction in fatigue strength if post-weld heat treatment is performed.

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