Paper Title:
FE Modelling of Mechanical Tensioning for Controlling Residual Stresses in Friction Stir Welds
  Abstract

Although Friction Stir Welding (FSW) avoids many of the problems encountered when fusion welding high strength Al-alloys, it can still result in substantial residual stresses that have a detrimental impact on service life. An FE model has been developed to investigate the effectives of the mechanical tensioning technique for controlling residual stresses in FSWs. The model purely considered the heat input and the mechanical effects of the tool were ignored. Variables, such as tensioning level, heat input, and plate geometry, have been studied. Good general agreement was found between modelling results and residual stress measurements, justifying the assumption that the stress development is dominated by the thermal field. The results showed a progressive decrease in the residual stresses for increasing tensioning levels and, although affected by the heat input, a relatively low sensitivity to the welding variables. At tensioning levels greater than ~ 50% of the room temperature yield stress, tensile were replaced by compressive residual stresses within the weld.

  Info
Periodical
Materials Science Forum (Volumes 539-543)
Main Theme
Edited by
T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran
Pages
4025-4030
DOI
10.4028/www.scientific.net/MSF.539-543.4025
Citation
D. G. Richards, P. B. Prangnell, P. J. Withers, S. W. Williams, A. Wescott, E.C. Oliver, "FE Modelling of Mechanical Tensioning for Controlling Residual Stresses in Friction Stir Welds", Materials Science Forum, Vols. 539-543, pp. 4025-4030, 2007
Online since
March 2007
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Price
$32.00
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