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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.

This paper deals with pulsed mode laser beam welding (LBW) on 2 mm thick Ti-6Al-4V alloy sheets. ANSYS Fluent 16.0 version is utilized to develop a generic model with Vc++ code. The model is validated with test results. The optimal LBW parameters are obtained by maximizing the depth of penetration (DP) and minimizing the weld bead width (BW). To minimise the number of numerical simulations, Taguchi approach is adopted. The LBW parameters considered are pulse frequency, pulse width and welding speed, the absorbed power is kept as constant. The performance indicators are width of fusion zone, depth of penetration, heat affected zone and maximum temperature. The optimal LBW parameters are found to be dependent on the process indicators. A simple reliable modified Taguchi approach is followed to get a set of optimal LBW parameters for maximum DP and minimum BW.