EFFECT OF SURFACE ENGINEERING ON ROLL BONDING OF THE AA 2024 ALCLAD PLATE

摘要

Hot roll bonding of aluminum plate and sheet currently is theprimary manufacturing method of fuselage skin sheet for aircraftand brazing sheet for automotive applications. Tremendouschallenges and opportunities exist to improve quality andproductivity of these products. This work explored the effects ofmacro- and micro-surface engineering on hot roll bondingprocess. It was found that micro-surface engineering yieldedbetter bonding quality than macro-surface engineering did. Thecritical surface roughness of the core was about 0.58 μm belowwhich bonding quality in terms of area contact and bondingenergy can be significantly improved. However, no markedimprovement was observed when the surface roughness wasreduced further to 0.03 μm. Also, the oxide layer on the surface ofthe core and local deformation on the surface of liner played avery important role. Ultrasonic test and roller peel test wereemployed to assess the bonding strength and quality. Thequantitative ultrasonic test results are in good agreement with theroller peel test results.