Identification of optimal numerical simulation of LBW process parameters on Ti-6Al-4V alloy

Abstract

Because of high density, low heat input LBW is an efficient welding Technique in industries and it offers low distortion. Numerical simulation provides the temperature field and weld pool size, which minimize the cost and trial experiments. A CFD model is developed to perform numerical simulation of pulsed laser beam on Ti-6Al-4V alloy of thickness 2mm.Taguchi adopted L9 OA to minimize number of numerical simulations. The ANOVA gives the effect and contribution of each process parameters such as pulse frequency(A), pulse width(B), absorber power(C) and welding speed(D) on performance indicators bead width(α), depth of penetration(β), Heat affected zone(γ)and maximum temperature(δ) are studied. Numerical simulations are validated through comparison of existing test by pulsed mode. A simple reliable modified Taguchi approach is followed to get a set of optimal LBW parameters for maximum DP and minimum BW.