Abstract
In present study, experimental and numerical analysis on CO2 laser welding of AISI 304 stainless steel sheet’s thickness of 1 mm was performed. Prediction of transient thermal history is essential while designing the welded joints. A 3D finite element (FE) model was developed using ANSYS 14.5 finite element package to determine the effect of welding process parameters, i.e., laser power and welding speed on thermal history of laser-welded joints. The influence of weld bead geometry obtained from experiment was considered in this 3D finite element (FE) model to simulate the moving volumetric heat source. The element birth and death technique was used in FE thermal analysis to simulate the progression of the laser weld zone. It was observed that the cooling rate was significantly affected by the varying laser power and welding speed. It was also observed that increasing laser power and decreasing welding speed lead to increase in size of fusion zone and heat-affected zone. The transient thermal analysis results obtained from FE model and experimental results were validated, fairly well, with maximum percentage error of 6.47% for the peak temperature.
Published Version
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