ISSN:
1662-9752
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
Although Friction Stir Welding (FSW) avoids many of the problems encountered whenfusion welding high strength Al-alloys, it can still result in substantial residual stresses that have adetrimental impact on service life. An FE model has been developed to investigate the effectives ofthe mechanical tensioning technique for controlling residual stresses in FSWs. The model purelyconsidered the heat input and the mechanical effects of the tool were ignored. Variables, such astensioning level, heat input, and plate geometry, have been studied. Good general agreement wasfound between modelling results and residual stress measurements, justifying the assumption that thestress development is dominated by the thermal field. The results showed a progressive decrease inthe residual stresses for increasing tensioning levels and, although affected by the heat input, arelatively low sensitivity to the welding variables. At tensioning levels greater than ~ 50% of the roomtemperature yield stress, tensile were replaced by compressive residual stresses within the weld
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.4025.pdf
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