The Effects of Residual Stress and HAZ on Fatigue Crack Growth in MIG Welded2024 and 7150 Aluminium

摘要

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