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The effect of weld residual stress, and hardness profile on fatigue crack
propagation in MIG welded 2024 and 7150 aluminium joints was studied. Residual
stress fields in the weld were measured using neutron diffraction. Tests were
performed using a range of mean stresses and on different starting defect
shapes. It was found that fatigue crack propagation in weld metal and HAZ is
influenced by crack morphology and also the distribution of residual stress and
hardness. Control of these parameters will optimise damage tolerance capability
in welded safety critical structures
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