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Influence of Tool Shoulder Concave Angle and Pin Profile on Mechanical Properties and Microstructural Behaviour of Friction Stir Welded AA7075-T651 and AA6061 Dissimilar Joint

  • Yuvaraj Kunnathur PeriyasamyEmail author
  • Ashoka Varthanan Perumal
  • Boopathiraja Kunnathur Periyasamy
Technical Paper

Abstract

In this present study, an attempt has been made to investigate the influence of tool shoulder concave angle and pin profile on mechanical properties and microstructural behaviour of friction stir welded AA7075-T651 and AA6061 dissimilar joint. The concave profile tool shoulder with three different angles of 1.5°, 3° and 4.5° was employed. Besides, three different pin profiles like straight cylindrical, square and triangular were used to fabricate the FSW joints. The concave shoulder angle regulates the frictional heat, and the tool pin profile enhances the material flow to improve the mechanical properties of the joint. From this work, it was found that 3° concave shoulder profile with square pin exhibits the maximum tensile strength, hardness and bending angle of 298 N/mm2, 143 Hv and 49°, respectively. The pulsating stirring action of the square tool pin exhibits ductile fracture, and it is evident from the presence of fine dimples.

Keywords

Friction stir welding Tool shoulder profile Tool pin profile Tensile strength Microhardness Bending strength 

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Copyright information

© The Indian Institute of Metals - IIM 2019

Authors and Affiliations

  1. 1.Sri Krishna College of Engineering and TechnologyCoimbatoreIndia
  2. 2.Sri Krishna College of TechnologyCoimbatoreIndia

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