Effect of Diamond Burnishing on the Properties of FSW Joints of EN AW-2024 Aluminum Alloys

The article presents the results of an analysis surface roughness parameters, microhardness, and stresses layer ofFSW butt joints subjected to burnishing process with a diamond tip. This can be useful in selecting optimal parameters process, ensuring best properties FSW joint. Burnishing force feed rate influence were analyzed according two-factor three-level full factorial statistical completed plan PS/DC 32. tested material was 2024-T3 aluminum alloy sheets thickness 2 mm. show that significantly reduced from Sa = 6.46 ?m range 0.33 ?m–1.7 ?m. treatment provides high compressive residual ?x ?86 ?130 MPa ?y ?158 ?242 MPa. Microhardness increased 84.19% 174.53% compared joints. Based on obtained results, multi-criteria optimization carried out. allows us obtain compromise solution (?x=?123 ?y=?202 MPa) microhardness HV=362.56 mm/mm2 weld 0.28 µm, Sku 3.93 Spc 35.88 1/mm.