The Effect of FSVP on Microstructure and Mechanical Properties of Aluminum Alloy Weldment Produced by Tungsten Inert Gas

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

Keywords:

Fusion welding , Defects , FSP , FSVP , Microstructure , Mechanical properties