[en] Full text: The importance of steel in the automotive industry is undeniable and it lasts as the most widely used material in vehicle platform. Worldwide product developers do efforts toward a new generation of vehicle platforms responding to legislative and environmental requirements keeping competitive advantages for the automotive industry. Weight reduction is mandatory for reducing fuel consumption and greenhouse gases from the transportation sector. Regarding this, recently a novel class of lightweight and high-strength steel was developed, mentioning Advanced High Strength Steels (AHSS), such as Dual Phase (DP) steel. Also, giving focus on new design, fabrication time, reproducibility and assembly techniques for automotive production, Laser Beam Welding – LBW is successfully applied because its high process speed, the possibility to weld dissimilar joints, and conformation of tailored blanks after welding. The current work purposes the optimal conditions for the weldability of Dual Phase DP600 steel by the laser welding process without filler metal (autogenous). The welding process was performed by a laser beam from Yb:Fiber equipment, (IPG, YLR-2000). The best condition was achieved setting power at 1500 W and welding speed at 50 mm/s. The fusion zone (FZ), and in the heat affected zone (HAZ) were characterized. Results show that the hardness on the welding were around 400HV, which means the hardness is higher than the metal base. The microstructural analyses were studied by X-ray diffraction, optical and electron microscopy. Chemical homogeneity was verified by micro X-ray fluorescence. The results show continuous, chemically and structurally homogeneous weld, according to the base material, with suitable mechanical properties for the application. (author)