Abstract
As a direct bonding method, hot pressing connection offers versatility for manufacturing high quality multi-material structures. This experimental study focuses on the hot-press bonding of short-glass-fiber reinforced PA66 and Al5754 alloy. Laser surface structuring with grid pattern is performed on the metallic adherend to enhance the bonding strength and the scarfing ratio of 1:4 is analyzed for the dissimilar joint. Contact angle measurements and X-ray photoelectron spectroscopy (XPS) are used to evaluate the surface modification. Mechanical performance of the joints is studied in terms of the tensile-shear and flexural properties. Morphology of the fracture surfaces is scrutinized through a scanning electron microscopy (SEM). According to the results, it is found that the laser ablation treatment significantly affects the surface of the metallic adherend and subsequent joint strength. The scarf adhesiveless joint shows a mixed fracture with a negligible elastic deformation under tensile-shear loading. Furthermore, the joint performs better under the bending load from the metallic adherend.
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