Abstract
The local surface displacement during the laser beam welding process of MgSi alloyed aluminum sheets (AA6014) in overlap configuration was optically determined near the weld seam by means of digital correlation of images recorded with a high-speed video camera. The analysis allowed the time- and space-resolved determination of the plane strain in the immediate vicinity of the solidification zone behind the weld pool. The observations revealed characteristic signatures in the temporal evolution of the strain that are related to the formation of centerline cracks in laser beam welding.
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