The study examined laser welding of the aluminium alloy EN AC-46000 in terms of achieving joint tightness. Welded samples were analyzed using leak tests, burst tests, and metallography. All samples were leak-tight at 1.7 bar and withstood pressures above 6 bar, confirming the functionality of the joints. However, porosity was observed, which may affect long-term reliability. It was found that weld quality is influenced by welding parameters, surface preparation, and joint geometry. Laser welding proved to be a fast and automated alternative to friction stir welding, which, with further improvements, could be suitable for mass production.
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