ISSN:
1662-9752
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
Finite element modelling has proved to be an effective tool for the investigation of trendseffected by changing welding conditions. This is especially important in mechanical tensioning offriction stir welds because of the large number of parameters involved. In this paper, an FE model isused to examine the effectiveness of the mechanical tensioning technique for controlling residualstresses in FSWs by the investigation of trends caused by changes to the welding parameters.Comparisons between different geometries, traverse speeds, and welding off-axis angle all producedconsistent results, and showed that the peak stresses are most strongly influenced by both the localtensioning and heat input, and not by the more global welding conditions. The results also showed aprogressive decrease in the residual stresses for increasing tensioning levels and, although affected by theheat input, a relatively low sensitivity to the welding variables. At tensioning levels greater than ~50% ofthe room temperature yield stress, tensile stresses were replaced by compressive residual stresses withinthe weld
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.71.pdf
