Numerical investigation on the stress evolution of welding process in aluminium alloy 2219
Keywords:Stress evolution, welding process, finite element analysis, aluminum alloys.
In this paper, a dynamic welding model of tungsten inert gas welding is established to study the evolution of stress during welding and the distribution of residual stress. The residual stress of post-weld is measured by the hole-drilling method and compared with the simulation results to verify the validity of the calculation model.. The results show that there has a large instantaneous compressive stress existing in the front end and both sides of heat source during the welding process. After the heat source passes, the dynamic compressive stress at the back-end of heat source gradually transforms into tensile stress and the tensile stress region continuously expands to both sides of the weld. The residual stress of post-weld in the weld is mainly dominated by longitudinal tensile stress. The maximum tensile stress of post-weld is 165 MPa, which is about 47% of the yield strength of the base metal, and is located in the heat-affected zone.