This work presents the comparative results of twin-spot laser welding of complex phase and transformation induced plasticity steels. Both steels include Nb and Ti microalloyed elements. Tests of dual beam laser welding were carried out using keyhole welding. The sheets were welded with two different power beam distributions in order to determine the effect of simulated thermal cycles on microstructure and hardness profiles. The power distributions between the beams were 50:50 and 70:30 %. The microstructural constituents in the fusion zone, heat affected zone and base metal were identified using light microscopy and scanning electron microscopy. It was found that the change of beam distribution affects morphological details of the martensite and hardness.Keywords: AHSS, twin-spot laser welding, dual beam, microalloying
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