VALEDICTION OF RESIDUAL STRESS MEASURED USING HOLE-DRILLING METHOD WITH 3D SIMULATION THAT DEVELOPED DURING TIG WELDING OF AISI 304 SS PLATES

Welding is aneffective permanent metal joining processes among all other processes in manufacturing. In welding, a thermal cycle is applied to the weldment. Where welding temperature differs across the material which results in irreversible elastic-plastic deformation and itinduces the residual stresses in and around the welded and heat affected zone (HAZ). Presence of residual stresses may be beneficial or harmful based on the magnitude available along the thickness of the weldment. Here hole-drilling method is adapted to measure residual stresses on the fusion zone of weldment as it suits well with the study of uniform residual stress in a localized area. From the experimental results of hole-drilling method obtained from sophisticated laboratory setup under high precision is set for further investigation. Using finite element based commercially available software coupled thermo-mechanical 3D finite element model was developed by with adefined geometry of the butt welded joint with prerequisite welding parametric conditions adopted during fabrication process. FEM analysis was performed to investigate themagnitude of residual stresses along its thickness in manual GTAW welded joint of AISI 304 stainless steel plate. Variation of residual stress in the vicinityof top surface of welded zone also studied.