Fatigue Improvement of Welded Components by Shot Peening

Author:  Henri-Paul Lieurade, Cetim, Senlis, France
Source:  Conf Proc: ICSP-9 (pg 16-27)
Doc ID:  2005046
Year of Publication:  2005
Abstract:  
ABSTRACTS Among the variables which affect the fatigue behaviour of welded components, the microgeometry and the residual stress conditions play a major role, in particular as regards the fatigue life spent in the crack initiation stage. The objective of post weld treatments applied for increasing the fatigue strength of such components is to create, as far as the two above-mentioned parameters are involved, situations more favourable than in as welded conditions. Shot peening is considered among the most-efficient techniques. The goal of this paper is, first to describe the mechanical characteristics due to shot peening, then to list the main parameters, in order to optimize the shot peening process, and to emphasize the effect of the initial weld quality, finally to summarize the effects of the loading parameters on the improvement level.