Fatigue Loading on TI -6AL-4V Cruciform Shape Welded Joints with Different Weld Bead Shapes

Estimation of fatigue life was carried out on TIG welded joints of TI6AL4V cruciform shape using S-N curve applying fracture mechanics approach for predicting propagation of cracks. Fatigue tests are carried out with stress ratio R =0.1, considering the constant amplitude and frequency 10HZ using 100 KN servo hydraulic universal testing machine. Fatigue tests, tensile tests and hardness tests revealed that a convex shape, weld joint is having better performance when compared to others Joints. The studies are based on the theoretical fatigue life and experimental fatigue life values are compared for the validation of results and both studies are correlated with AWS D1.9 2007. The behaviour of welds under fatigue crack growth of are related to mechanical properties of the different weld bead shapes, joints, and the convex shape, weld with less stress exhibited higher fatigue resistance and records maximum fatigue life The main objective of this study is the theoretical and experimental analysis of the change in fatigue life, crack growth, SIF and SEM analysis of with different weld bead shapes and constant welded plate thickness with different L/Tp ratio.