The effect of tensioning and sectioning on residual stresses in aluminium AA7749 friction stir welds

J Altenkirch, A Steuwer, MJ Peel, DG Richards, PJ Withers

Research output: Contribution to journalArticle (Academic Journal)peer-review

62 Citations (Scopus)

Abstract

Using synchrotron X-ray diffraction the residual stress distribution has been measured in a series of AA7449-W51 aluminium friction stir welds that had been tensioned to different loads during welding. By modifying the stress accumulation path, the application of a tensioning stress has reduced the tensile magnitude of the final residual weld stresses. In the present case the residual stresses were minimised when the applied load is 35% of the room temperature yield stress of the parent material. Subsequent sectioning of the weld into shorter test lengths, as might be necessary for weld testing, resulted in a progressive and significant relaxation of the residual stress field. The effect of tensioning on the weld component distortion also has been investigated.
Translated title of the contributionThe effect of tensioning and sectioning on residual stresses in aluminium AA7749 friction stir welds
Original languageEnglish
Pages (from-to)16 - 24
Number of pages9
JournalMaterials Science and Engineering: A
Volume488
Issue number1-2
DOIs
Publication statusPublished - Aug 2008

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