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Predicting Tensile Properties of Friction-Stir-Welded 6063 Aluminum with Experimentally Measured Welding Heat Input

Acta Metallurgica Sinica(English Letters) 2020年第9期33卷 1235-1242页

作者： Tianbo Zhao yutaka ssato Hiroyuki Kokawa Kazuhiro Ito Department of Materials Processing Graduate School of EngineeringTohoku University6-6-02 Aramaki-aza-AobaSendai 980-8579Japan Joining and Welding Research Institute Osaka UniversityMihogaoka11-1IbarakiOsaka 567-0047Japan Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

This work aims to develop a reliable method to predict mechanical properties of friction-stir-welded 6 xxx-series alloys with experimentally measured welding heat input. A calorimetrical method was utilized to experimentally measure the welding heat input in the friction stir welded of aluminum alloy 6063-T5. Good correlations between the input variables, i.e., welding parameters and physical properties of the materials, and the welding heat inputs obtained with experimental measurements were discovered. The welding heat input can be predicted using the empirical equation derived based on these correlations. Moreover, the results suggested that the thermal conductivities of the welded alloys affected the welding heat input significantly. Mechanical properties, including hardness and tensile properties, of friction-stir-welded aluminum alloy 6063 were in good correlation to the heat input obtained with experimental measurement. These correlations were explained by the evolution of the strengthening precipitates during welding. This work proposed a reliable new route to predict these mechanical responses through the estimation of heat input.

关键词： Heat input Friction stir welding Calorimetrical Mechanical properties Hardness

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