11 Fatigue Analysis of Dissimilar Metal Welded …
383
Fig. 11.14 Fracture surface 1 at 5000×
11.8 Conclusions
Dissimilar metal welds using gas tungsten arc welding, and the welded joints were
subjected to fatigue testing. The endurance limit for the butt joint specimens was
found to be 14.3% of ultimate tensile strength at 95% survival probability level.
The maximum fatigue damage value was reported to be 0.33 from quantitative
fatigue damage analysis. The fatigue failure mainly occurred in the weld region
due to increased hardness and geometrical discontinuity. However, the joints have
undergone significant plastic deformation before failure. The fractography revealed
striations as well as dimples.
383
Fig. 11.14 Fracture surface 1 at 5000×
11.8 Conclusions
Dissimilar metal welds using gas tungsten arc welding, and the welded joints were
subjected to fatigue testing. The endurance limit for the butt joint specimens was
found to be 14.3% of ultimate tensile strength at 95% survival probability level.
The maximum fatigue damage value was reported to be 0.33 from quantitative
fatigue damage analysis. The fatigue failure mainly occurred in the weld region
due to increased hardness and geometrical discontinuity. However, the joints have
undergone significant plastic deformation before failure. The fractography revealed
striations as well as dimples.