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Steel fusion welding is characterized by phase transformations influencing the final mechanicalproperties. Such properties and modifications are strongly related to welding parameters such as speed, current,voltage and heat input. In the present paper hardness, residual stresses, phase transformations, tensile, fatigueand impact properties of different steel welds have been related to the material composition, geometry and thewelding conditions by employing a multi objective optimization software (modeFRONTIER(R)). As a matter offact the weight of the different parameters influence have been evaluated through such kind of study. Anoptimization analysis have been performed in order to identify the best welding condition for each kind of steeltaking as final goal the fatigue and impact strength of the joints.