Friction stir-welding of AA7075 has become widely used in the fabrication of light-weight structures requiring high strength-to-weight ratios and superior corrosion resistance. The friction stir-welding (FSW) process plays a key role in determining the joint's characteristics. Like a microstructure of different positions along the thickness of the aluminium alloy plate has been investigated. Friction stir welding (FSW) is a relatively advanced method which has been systematically developed for joining of all type of aluminium alloys. Consistent with the more conventional methods of friction welding, which have been practiced recently, in friction stir weld is made in the solid phase. The mechanical test l data confirmed an increase mechanical and metallurgical e behavior after changing of its microstructure and also explain about mechanical properties such as tensile strength, micro hardness. © 2015 Elsevier B.V., All rights reserved.