Weld pitch effects on friction stir welding of aluminum alloys

A.R.S Essa , Mohamed M.Z. Ahmed c,d , Abdelkarim Y. A. Mohamed a Mechanical Department, Faculty of Technology and Education, Suez University, Suez, Egypt. b Mechanical Engineering Department, Egyptian Academy for Engineering & Advanced Technology, Affiliated to Ministry of Military Production, Cairo, Egypt. c Department of Mechanical Engineering, College of Engineering at Al Kharj, Prince Sattam Bin Abdulaziz University, Al Kharj 11942, Saudi Arabia. d Department of Metallurgical and Materials Engineering, Faculty of Petroleum and Mining Engineering, Suez University, Suez 43512, Egypt.