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The purpose of this article is to investigate the effect of sandblasting surface treatment, before the bonding process,
on the strength of the adhesive joints of the three types of aluminium alloy sheets. Three values of pressure were
used during the sandblasting process, i.e. 0.41 MPa, 0.51 MPa and 0.56 MPa. After mechanical treatment, the
samples of aluminium alloys sheets were degreased three times with acetone by immersion. The elements were
bonded with single-lap joints using two components epoxy adhesive. After the curing process, the shear strength
tests of the aluminium alloy adhesive joints were conducted, according to the DIN EN 1465 standard. The surface
topography of all samples was measured, and the most important surface roughness parameter and its waviness
were determined. Based on the experimental results, it was noticed that, among others, while using the same pres-
sure value during sandblasting of different aluminium alloys, the roughness parameters Ra and Rz of the obtained
surfaces differed depending on the type of alloy. It is also to notice that more than two times strength of the joints
was obtained by those made of the aluminium alloy sheet, which was subjected to heat treatment.
