A review of inducing compressive residual stress - shot peening; on structural metal and welded connection

Shot peening treatment (SPT) is a significant mechanical method to enhance the surface of the material by inducing compressive residual stress on the layer. This study provides a review of prominent improvement in fatigue life on high strength aluminium alloy, steel and welded connection by SPT. Compressive residual stress measurement and its factors data are extracted from assorted literature, optimized peening process commented in this paper, also different types of mechanical peening methods and its effectiveness are mentioned. Fatigue life improvement is focused commented to welded structural connections. The extracted results shows significant changes in the surface layer of metals, aluminium alloy 15 - 250% of fatigue life improvement, steel plain members 6-200% of fatigue life improvement, welded connections 50-75% of fatigue life improvement and significant improvement in mechanical properties like roughness reduction, wear, hardness, tensile strength, corrosion and scuffing.