Shahrokh Azari - Mechanical Engineering Faculty, Iran University of Science and Technology, Tehran, Iran
Parisa Hosseini tehrani - Automotive Engineering Faculty, Iran University of Science and Technology, Tehran, Iran
Mohammad Hagh Panahi - Mechanical Engineering Faculty, Iran University of Science and Technology, Tehran, Iran

An axisymmetric finite element model is developed to predict residual stresses- both in depth and on the surface- induced by laser spot welding of 304 stainless steel. A decoupled thermo-mechanical procedure is implemented with all material properties temperature-dependant. Distribution of residual stresses fairly agrees with empirical observations. Effect of preheating on the resultant residual stresses is investigated. One of the challenges in welding simulation is determination of absorption coefficient. In this work effect of absorptivity on the residual stresses induced by laser spot welding is also inspected.

Finite Element – Laser Spot Welding – Residual Stress – Preheating – Absorptivity