Parametric Study of Reinforcement of Keyhole-less Friction Stir Spot Welding using Al۲O۳ and TiO۲ Nanopowders
Publish place: The Iranian Journal of Materials Forming، Vol: 10، Issue: 2
Publish Year: 1402
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_IJMF-10-2_007
تاریخ نمایه سازی: 14 شهریور 1402
Abstract:
In the present paper, two-stage refilled friction stir spot welding is used to join mild steel sheets with a thickness of ۲ 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 ۴۲% and ۱۸% with alumina and TiO۲ as reinforcement, respectively. With a ۳۱.۹۴% 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.
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Authors
M. Salehi
Mechanical Engineering Department, University of Birjand, Birjand ۹۷۱۷۵-۳۷۶, Iran
S.M.H. Seyedkashi
Mechanical Engineering Department, University of Birjand, Birjand ۹۷۱۷۵-۳۷۶, Iran
M. Sajed
Mechanical Engineering Department, Azarbaijan Shahid Madani University, Tabriz, Iran
H. Rastegari
Department of Mechanical and Materials Engineering, Birjand University of Technology, Birjand, Iran
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