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The wider use of aluminum and its alloys also involves specific technologies for reconditioning and repairing the various components. Specialist studies have shown that a more advantageous technique, from an economical point of view, than welding with less polluting and good mechanical properties is brazing. The only disadvantage of this process is the stage of preparing the surfaces to be assembled. Specialty literature and many published papers provide detailed information with direct reference to the mechanical and physical properties of aluminum alloy assemblies refurbished by brazing depending on the surface preparation mode. The present paper aims to make a study, based on experimental data, on how the surface preparation influences the hardness of aluminum alloy assemblies refurbished by brazing. The areas of the base materials, the filler material as well as the thermal diffusion zones resulting from the brazing operation will be studied. The main problem is the difference in hardness between the materials to be assembled and the material with which they are assembled. This can be a major cause, which can generate defects in operating cycles by lowering the strength of the assembly. By choosing an optimal surface preparation technology, we can reduce these differences by obtaining an assembly with uniform properties in all its structure, so with a longer service life.

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