Microstructure and Properties of Welding Joints of 7A52 Aluminium Alloy by the Friction Stir Welding

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Abstract:

The7A52 aluminum alloy of the 30mm thickness was welded by the friction stir welding. The structure and the mechanical property of the welded joint was researched by the optical microscope and SEM, etc. The results showed: the hardness distribution along the cross section weld zone is W shape, TMAZ/HAZ transition zone of the weld joint is the softening zone , The min micro-hardness occurs on the TMAZ/HAZ transition zone of the advancing side. The tensile strength of the weld is 85.8% of the base mental, and it fractured in the TMAZ/HAZ transition zone, and the fracture morphology is dimple morphology.

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292-296

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January 2014

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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