Investigation of laser bending parameters on the residual stress and bending angle of St-Ti bimetal using FEM and neural network

•Investigation of laser parameters on bending angle of steel-titanium bimetal.•Investigation of laser parameters on residual stress of steel-titanium bimetal.•The bending angle increases with increasing power and number of scan passes.•Increasing of tensile residual stress by increasing power and passes number. In this paper effects of laser bending process parameters on bending angle and maximum tensile residual stresses was investigated on bimetallic steel-titanium sheet using finite element modeling and neural networks method. For this purpose, after validation of finite element modeling, 43 simulations were performed and the results of bending angle and maximum tensile residual stress were evaluated. The effect of process parameters including laser power, scanning velocity, number of passes, beam diameter and sheet thickness were designed based on response surface methodology. Design-Expert software was used to design experiments and analyze the results. The results showed that bending angle increases with increasing power and number of scan passes. The angle of bending is also inversely proportional to the scanning velocity, beam diameter and sample thickness, and decreases with increasing them. The maximum tensile residual stress increased with increasing laser power and the number of scan passes. By increasing the velocity of scanning, the beam diameter and the thickness of the maximum tensile residual stress sample was decreased.