Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 29    No. 11    November 2019

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Effect of knurling shoulder design with polygonal pins on material flow and mechanical properties during friction stir welding of Al-Mg-Si alloy
Krishna Kishore MUGADA1,2, Kumar ADEPU3

1. Department of Mechanical Engineering, Gayatri Vidya Parishad College of Engineering,
Madhuwarada-530041, Vishakhapatnam, India;
2. Energy System Materials Lab, Department of Advanced Materials Engineering,
Dong-Eui University, Busan 614-714, Korea;
3. Department of Mechanical Engineering, National Institute of Technology, Warangal-506004, Telangana, India

Abstract:Understanding the material flow facilitated by tool geometry in friction stir welds is challenging for quality weld production in industrial applications. The optimal tool shoulder and pin design combination, which plays a vital role in material flow was addressed. The flow of plasticized material was analyzed using a marker insert technique. The results show that the knurling shoulder design with square and hexagonal pin design facilitated constant stability force with reference to weld length/time. The uniform mixing and distribution of plasticized material were facilitated by the knurling shoulder design with square tool pin shape (TK)S (sticking length minimum) below which fragmented copper was observed. (TK)S tool facilitated higher mechanical properties for the welds, i.e. strength (182 MPa) and hardness (HV 78) in stir zone.

 

Key words: shoulder end feature; polygonal pins; material flow; axial force; mechanical properties

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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