Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Gazi University, Fen Bilimleri Enstitüsü, Turkey
Approval Date: 2023
Thesis Language: Turkish
Student: Tolga ARIBAL
Supervisor: Gökhan Küçüktürk
Open Archive Collection: AVESIS Open Access Collection
Abstract:
Understanding the parameters which affect the welding is significant in improving the process. In the scope of this thesis work, 5 mm thick aluminum 6061-T6 alloy plates were joined in butt welding conditions. For the welding process, tools manufactured from AISI 4140 steel were used. Tools differentiate from each other with the design of shoulder end surface designs. In the first part of the experiment, four different tool rotational speeds 800, 1200, 1400 and 1600 rpm and two different traverse speeds 60 and 90 mm/min were used with a flat shoulder end surface tool. In the second part of the experiment, flat, raised circular and recessed circular shoulder end surface tool designs were used in 800 RPM rotational speed and 40 mm/min traverse speed condition. Samples from the welded plates were extracted to conduct tensile testing and microstructural analysis to investigate the effects of the welding parameters on tensile strength in the friction stir welding process. The experiment conducted with a flat shoulder end surface tool concluded that increasing rotation speed and decreasing traverse speed decrease tensile strength. Maximum tensile strength with flat shoulder end tool was obtained as 183 MPa with 90 mm/min traverse speed using 800 and 1200 RPM. In the experiment to evaluate the effect of tool shoulder designs, the highest strength was obtained with raised circular shoulder end surface tool as 190 MPa using a constant 40 mm/min traverse speed and 800 rpm rotation speed.
Key Words : Friction stir welding, Al6061-T6, welded joints, tensile stress