Comparative studies of the geometric structure of the surface of aluminium alloys in the context of adhesive joints with Araldite 2014–2 adhesive

The paper presents an analysis of the influence of the surface modification method of aluminum alloys EN AW-1050A, EN AW-2024, EN AW-5083 on the surface SGP characteristics. The main objective of the research was to observe the change of specific SGP parameters as a result of surface modification of sheets using sandblasting and a laser beam. Laser texturing was performed using a 20 W fiber laser source for previously determined technological process parameters. To compare the effect of sandblasting and laser texturing on the change in SGP parameters, measurements were also taken of the sheet surface after rolling. The structure of the scanned surface was observed and recorded using a 3D laser profilometer. The readings obtained during the development of results for different states of the modified and unmodified surface were compiled in tables and presented using isometric images of the surface. Additionally, surface load-bearing capacity curves were plotted. For the laser-textured surface, the material morphology was analyzed in the vicinity of the laser beam interaction. The wettability of the surface was tested with two measuring liquids: demineralized water and diiodomethane. The strength and destruction energy of adhesive joints were compared for a 12.5 mm overlap.