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In the present study, mechanical properties of friction-stir-welded pure Al with varying welding parameters, including rotating and welding speeds, were examined. Five-mm-thick pure Al plates were FSW with varying tool rotating speeds of 600, 800, and 1200 rpm, and welding speeds of 40, 60, 80 mm/min. Different tool pin profiles (three shapes) were developed to weld the Specimens and the effect of tool pin profile on the mechanical properties of the weld joints was studied. Tensile test specimens were prepared with the tensile direction perpendicular to the welding direction, so that the weld zone was located in the middle of the specimen. The yield and ultimate tensile strengths were affected, by welding and rotational speeds but to a significantly less degree, with varying welding parameters. Low welding speed or high rotating speed tended to encourage the plastic flow per unit time and consequently the clustering of coarse precipitates. The hardness of the specimens was affected also by the different welding parameters. The effect of pin cross section on mechanical properties was analyzed and it was found that joints welded with straight cylinder pin cross section had better mechanical properties compared to the other pin cross sections . ه يه تنا وبهمهنا ةٕههسا واذختهسبخ وٕهيُيٕنما وبهمن ل هلإن ّهيكيَبكيًنا صئبصخنا لٔبُتت ةساسذنا ِزْ . إهنا ٗههى ةهساسذنا هًت كًسخ وٕيُيٕنلأا 5 يإعن اشييغت عي ىي م بهمهنا ٗهى ّيذختهسًنا ةادلأا مكش مًشت ٗتنا ٔ وبمهنا ةيهًى ٗهى ةشحؤًنا ٌاسٔد ةىشهس و وبهمهن ّهي خنا ةىشهسنا كنزهذ ٔ وبهمهنا ِادا . 066 ٔ 066 ٔ 0066 ّهفن \ لبىشهس ٍهي هذ عهي يذختهسا وبهمهنا ِدا ٌاسٔذهن ّه يقذنا ّيتلأا وبمهنا 06 ٔ 06 ٔ 06 ىي \ عهي عهخشي ٔ جههخي ٔ ةشهئاد مكش ٗهى ع ي بٓن وبمهنا ِادا ٍي عإَا ث ح واذختسا ىت كنزذ ّ يقذنا نا ميإعنا مذ ّ خبس . دبهٓجا سبه تتا مهًى ىتٔ وبمهنا ِبجتا ٗهى ّيدًٕى ٌٕكت جيمخ وبمهنا ٍي ةجتبُنا ءازجلأن ذشنا لبُيى زيٓجت ىت ٌاسٔذهنا ةىشهس ٍي ةفهتخًنا ميإعنا عي وبمهنا ِادا لبكشا ٍي مكش مكن لبُيعنا ِزٓن طسٕتًنا زتا ىتٔ لبُيعنا ِزْ مكن عٕضخنا وبمهنا ةىشس كنزذٔ ةادلأن . ظحٕن ٌذهعًنا قىذت ٍيسمت ٗنا كنر ٖدؤي ّعفتشًنا ٌاسٔذنا ّىشس عي ٔأ ةئي نا وبمهنا ّىشس عي َّا ٌذهعًنا لبه ي ح ٕهًَ ٗهنا ٖدؤهي مخب ًنا ٗهى ٍكن ٔ وبمهنا ءبُحا . ةهفهتخًنا لبهُيعهن ةد هصنا سبه تتا مهًى ىهت كنزهذ . ئبهتَ مهيهمت ىهت هسبخ هجتَا هتنا ل لإنا ٌا ٍي تٔ ّ خبسنا لاسب تتما ٍهي مهضىا ّهيكيَبكيي صئبهصخخ عهتًتت ةشهئاد مكهش ٗههى ٗهتنا ةادلأا واذخت عخشي مكش ٗهى ٗتنا كنزذٔ جهخي مكش ٗهى ٗتنا ةادلأا واذختسبخ جتَا تنا بٓت يخي

EFFECT OF TOOL GEOMETRY AND WELDING PARAMETERS ON THE MECHANICAL PROPERTIES OF COMMERCIAL ALUMINUM WELD JOINTS BY FRICTION STIR WELDING