Journal
MATERIALS & DESIGN
Volume 160, Issue -, Pages 1178-1185Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2018.11.009
Keywords
Laser beam welding; Aluminum alloy; Beam oscillation; Solidification; Grain structure
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Aluminum (AA6016) sheets were welded in overlap configuration to investigate the influence of different beam oscillation patterns on the resulting temperature gradient, the local solidification rate and the resulting grain structure and to compare the results with those obtained with the conventional rectilinear welding. Two pyrometers were used to experimentally determine the temperature gradient. The weld pool boundaries on the surface plane of the work piece were determined by image processing of high speed videos, in order to evaluate the local solidification rates. Metallographic analysis of the weld seams proved that laser beam oscillation during welding can be used to reliably form an equiaxed dendritic grain structure, which reduces the susceptibility to the formation of hot cracks. (C) 2018 Elsevier Ltd. All rights reserved.
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