Student:	Emre Deniz YALÇIN
Supervisor:	Assist. Prof. Dr. Tevfik KÜÇÜKÖMEROĞLU
Department:	Makine Mühendisliği
Institution:	Graduate School of Natural and Applied Sciences
University:	Karadeniz Technical University, Turkey

Title of the Thesis:	Investigation Of Joinability AA 7075 And AA5754 Aluminum Alloys By Friction Stir Welding Method
Level:	M.Sc.
Acceptance Date:	17/6/2010
Number of Pages:	115
Registration Number:	i2191

Summary:

In this study, AA 5754H22 and AA7075T651 aluminum alloys are joined in the butt

manner by using friction stir welding process. Welding process is realized by fixing the

stirring pin design, the speed of rotating tool and the angle of tool, however the different

travel speeds and tool impress forces are applied. The joined samples were investigated by

the methods of micro hardness, metallographic and tensile test. Results of this study

indicate that AA5754H22 and AA7075T651 aluminum alloys were successfully joined by

friction stir welding. In this assessment, although not much change has occurred on the

values of tensile stress and hardness depending on the amount of impress force, some

diversity was observed in the fraction mechanism.

Key Words: Friction Stir Welding, AA 5754H22, AA7075T651.