Aluminum alloy cavity component unequal thickness plate friction stir welding device and welding method

Abstract

The application discloses an aluminum alloy cavity component unequal-thickness plate friction stir welding device and a welding method. The friction stir welding device comprises a stirring head, a lower shaft shoulder, an upper shaft shoulder, a support cover and a tool shank. The upper shaft shoulder and the lower shaft shoulder are sequentially sleeved on the upper and lower parts of the stirring head. The lower end of the support cover is connected with the top of the upper shaft shoulder. The welding method comprises the following steps: step one, selecting the upper shaft shoulder; step two, selecting a gasket plate with a corresponding thickness; step three, performing butt joint assembly; step four, fixing the upper shaft shoulder at the front end of the support cover; step five, enabling the lower shaft shoulder to rotate with the stirring head; step six, enabling the end face of the lower shaft shoulder to be attached to the bottom surface of the thick plate side and the thin plate side; step seven, starting the friction stir welding equipment to perform welding; step eight, forming a continuous, dense and smooth transition welding joint; and step nine, detecting the welding seam surface. The device has the advantages that the adaptability and stability of the device to unequal-thickness component welding and the weldability of the cavity structure plate butt joint welding seam are improved.

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