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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2006

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Numerical thermodynamic field modeling of a metallic substance during laser welding

Achab L., Amara E. H., Mebani N., Allalou N., Hamadi F.

Journal of Achievements in Materials and Manufacturing Engineering

2006

Vol. 15, nr 1-2

94--99

Purpose: A simplified numerical model which predicts the molten zone thermodynamics, resulting from laser irradiation is developed. Design/methodology/approach: The treatment of this problem is founded on the resolution of the dynamic and thermal flows differential equations, by taking into account the effects of material fusion. Numerical simulations of this steady two-dimensional flow have been carried out using the commercially available software FLUENT. Findings: The proposed numerical study allows us to deduce the thermal and dynamic characteristics of the molten zone, as well as to relate the operating parameters such as the welding speed and the laser power to the form and the dimension of the molten zone. Research limitations/implications: The experimental studies performed on the influence of the operating parameters on the quality of the weld joints produced on work-pieces would be very costly and time-consuming and in more cases, it is difficult to access to some physical unknowns. However, by including as much as possible of terms describing physical mechanisms in the general form of the equations, one can model more on less accurately the welding process. Practical implications: This initial study has produced some encouraging evidence for the capacity of FLUENT in simulating the key features of laser welding treatment. Originality/value: In our contribution, the introduction of the enthalpy-porosity formulation has been used to obtain the geometry of a fused zone, as a function of the operating parameters. The numerical results have shown, that by a proper choice of the laser power and the welding speed, the desired morphology and fineness may be incorporated into the alloyed zone.