Affiliation:
1. GKSS Research Centre
2. GKSS-Forschungszentrum Geesthacht GmbH
3. HASYLAB at DESY
4. AIRBUS Germany
Abstract
Residual stresses in CO2 laser beam welded AA6056 Al-sheets of 3.2 and 6.0 mm
thicknesses were studied using neutron and high-energy X-ray diffraction. The influence of the
temper T4 and T6 before welding, the effect of sheet thickness in T6 temper, and the effectiveness
of post-weld heat treatments T6 and T78 for the reduction of residual stresses in the sheets welded
initially in the T4 temper were examined. It was found that tensile longitudinal stresses were
significantly higher when welded in T6 than in T4. With the increase in the sheet thickness from 3.2
to 6.0 mm, the residual stress profile was affected more than the stress level when welded in T6. For
3.2 mm sheet, the post-weld heat treatments T6 and T78 did not lead to a significant reduction in
residual stresses when welded in T4.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
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