1397 - Tungsten inert gas (TIG), as an arc welding that uses a non-consumable tungsten electrode to produce the weld, is widely used to weld aluminum alloys. However, development of some defects such as porosity and undercutting which form during TIG welding may decrease the quality of the weld. Processing of the weld by Friction stir processing (FSP) is a method to enhance the weld quality. In the current work, in a new try, the weld area produced by TIG is processed by FSVP (friction stir vibration processing). In this process, the workpiece is vibrated normal to processing line while FSP is carrying out. The results show that FSVP is more beneficial than FSP. The grain size of FSV processed specimens is lower than FS processed specimens and the strength and ductility of the former specimens are higher than the latter ones. These can be related to the effect of workpiece vibration during FSVP which enhances the straining of material in processing zone. It results in more dynamic recrystallization and correspondingly lower size grains are developed. FSVP is a good alternative for FSP and it is recommended for application in industry. iMAT