Synchrotron X-ray Analysis of the Influence of the Magnesium Content on the Absorptance during Full-Penetration Laser Welding of Aluminum

Full-penetration laser beam welding is characterized by a weld seam whose depth equals the material thickness. It associated with stable capillary and therefore widely used for of sheet metal components. The realization lightweight concepts in car body production requires application high-strength aluminum alloys that contain magnesium as an alloying element, which significantly influences evaporation temperature pressure. This change processes geometry its absorptance. In order to quantify influence on capillary, their geometries were captured means high-speed synchrotron X-ray imaging during process AA1050A (Al99.5), AA5754 (AlMg3) AA6016 (AlSi1.2Mg0.4). 3D-geometries capillaries reconstructed from intensity distribution recorded images absorptance incident was determined analysis 3D-geometry raytracing algorithm. results presented this paper capture first time content aspect ratio explains reduced case full-penetration high volatile elements. improve welding, these findings provide information required deduction new optimization approaches.