Investigation on the Surface Properties of 5A12 Aluminum Alloy after Nd: YAG Laser Cleaning

摘要： The surface of the aluminum alloy is prone to oxidation, which in turn a?ects the quality of the weld. The 5A12 aluminum alloy was cleaned by acousto-optic Q-switched diode-pumped Nd:YAG laser and the e?ects of di?erent laser powers and di?erent cleaning speeds on the surface roughness, microstructure, element content, microhardness, residual stress and corrosion resistance of aluminum alloy were investigated. The results show that when the power is 98W and the cleaning speed is 4.1 mm/s, the e?ect of Nd: YAG laser on the removal of oxide ?lm on 5A12 aluminum alloy surface is the most e?ective. After laser cleaning, the smoothness and strength of aluminum alloy surface can be e?ectively improved. However, as a major element in 5A12 aluminum alloy, the content of magnesium decreased. At the same time, the residual tensile stress was generated on the surface of the aluminum alloy after cleaning, and the corrosion resistance slightly decreased.