الفهرس 
chapter 1Only 14 pages are availabe for public view
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Abstract
The tool geometry and the welding parameters are the main factors ,which affect the quality of friction stir welding. The present work represents a contribution in this field. Emphasis was focused on the investigation of the effect of pin tool geometry, rotational speed, and welding speed on the mechanical properties of the material. Four tool pin geometries were used i.e cylindrical , conical , triangle and square shape with different rotation speed and variable welding speed with each tool pin geometry. The present work shows that friction stir welding of commercially pure aluminum and copper plates is possible using straight cylinder, triangle, or square tool pins. The major parameter affected on the mechanical properties of the welding joints used in the present work was the welding speed. The mechanical properties of the joints welded with low welding speed were better than the joints welded with high welding speed.