Papers by Keyword: Friction Stir Jointing

Abstract: The friction and wear properties of the friction stir jointing 7022 aluminum alloy joining region were tested in this paper. The friction coefficients and wearing capacities of the joining regions under different joining process parameters were obtained. The experiment results showed that the friction coefficients and wearing capacities of the joining regions had a certain relationship with the hardness, but not became direct ratio relation. The friction coefficient of the joining region was smaller than that of the base metal. This main reason was base metal was lath-shaped grain, and the joining region was isometric crystal. The wear volume under 400/30 parameters was minimum. The wear volume was greatly influenced by the hardness of the joining region, but was not direct proportion relationship. Due to the random factors influence in friction process, the law of the friction coefficient reflecting friction and wear was not the same with the law of wear volume reflecting friction and wear. The friction form was abrasive wear and adhesive wear.

Abstract: Milling process of jointing blank of 7022 aluminum alloy was simulated by ANSYS. The results show that the maximum residual tensile stress and pressure stress are mainly concentrated in the jointing seam zone when the jointing blank is milled. The milling deformation of jointing blank is shown as “wave” shape. The milling deformation of key eye side is shown upwarp. The jointing initiating terminal is shown downward displacement. The maximum downward displacement is present to the middle of jointing seam central line. In additional, the milling deformation along sheet length direction is shown outward extension.