A butt welding aluminum with copper by friction stir welding has been investigated in this study. The rotation direction of the tool and the probe offset with respect to center of butt line are the main welding parameters affecting the welding quality founded in this study. A sound welding has been obtained when aluminum arranged on advancing side, with sufficient probe offset to aluminum side. Also, defect free Al-Cu welded joint produced when the copper arranged on advancing side with probe offset to aluminum side. So, probe offset play as important factor rather than direction of rotation in welding Al-Cu by friction stir welding.
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