A comparative study of the heat input during laser welding of aeronautical aluminum alloy AA6013-T4.
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2018
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The heat input is the amount of energy supplied per unit length of the welded workpiece. In this study, the effect of
two different heat inputs in laser beam welding of a high strength aluminum alloy AA6013-T4 was evaluated from macrostructural
and microstructural points of view. The experiments were performed using a continuous wave 2 kW Yb-fiber laser with 100 μm
spot size on the upper surface of the workpiece. Keeping the heat input at a given level, 13 or 30 J/mm, the laser power was
changed from 650 W to 2 kW and the welding speed from 33 to 150 mm/s. In the condition of higher heat input 30 J/mm
it was possible to obtain both cutting and welding processes. For 13 J/mm, welding processes were obtained in conduction
and keyhole modes. The equiaxed grain fraction changed with changing speed for the same heat input. The laser processing
induced a decrease in the hardness of the weld bead of about 25% due to the solubilization of the precipitates. The estimated
absorptivities of the laser beam in the liquid aluminum changed largely with experimental conditions, from 4.6% to 10.5%, being
the most significant source of error in measuring the real amount of energy absorbed in the process. For the same heat input the
macrostructure of the welded surfaces, i.e., humps and dropouts, changed as well. All these facts indicate that the heat input
is not a convenient method to parameterize the laser beam welding parameters aiming the same weld features.
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Laser processing, Laser beam welding, Aluminum alloy 6013-T4
Citação
COELHO, B. N. et al. A comparative study of the heat input during laser welding of aeronautical aluminum alloy AA6013-T4. Journal of Aerospace Technology and Management, São José dos Campos, v. 10, p. 925, 2018. Disponível em: <http://www.scielo.br/scielo.php?pid=S2175-91462018000100324&script=sci_abstract&tlng=en>. Acesso em: 13 fev. 2019.