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Parametric Study of Reinforcement of Keyhole-less Friction Stir Spot Welding using Al2O3 and TiO2 Nanopowders | ||
| Iranian Journal of Materials Forming | ||
| دوره 10، شماره 2، تیر 2023، صفحه 55-67 اصل مقاله (3.88 M) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22099/ijmf.2023.47414.1257 | ||
| نویسندگان | ||
| M. Salehi1؛ S.M.H. Seyedkashi* 1؛ M. Sajed2؛ H. Rastegari3 | ||
| 1Mechanical Engineering Department, University of Birjand, Birjand 97175-376, Iran | ||
| 2Mechanical Engineering Department, Azarbaijan Shahid Madani University, Tabriz, Iran | ||
| 3Department of Mechanical and Materials Engineering, Birjand University of Technology, Birjand, Iran | ||
| چکیده | ||
| In the present paper, two-stage refilled friction stir spot welding is used to join mild steel sheets with a thickness of 2 mm. Meanwhile, alumina and titanium oxide nanopowders are also introduced to the nugget to achieve superior mechanical properties. Two non-consumable tools are used with and without pins to weld and refill the keyhole, respectively. Before refilling, the keyhole is filled with nanopowders which are then distributed by the pinless refilling tool. Three parameters are investigated; the rotational speed of the welding tool and the rotational speed and dwell time of the refilling tool. The tensile test is used to evaluate the strength of the joints. The microhardness is measured in the welding zone to evaluate the powder distribution. The results suggest an increase in the joint strength by 42% and 18% with alumina and TiO2 as reinforcement, respectively. With a 31.94% contribution, the refilling tool rotational speed is the most effective input parameter affecting the joint strength. Considering the microstructure analysis and the microhardness test, the material flow pattern is mainly downward which results in the accumulation of the reinforcing powder in the lower sheet especially when a lower refilling tool rotational speed is used. | ||
| کلیدواژهها | ||
| Two-stage Refilling Friction Stir Spot Welding؛ Mild Steel؛ Nanopowder؛ Joint Strength | ||
| مراجع | ||
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