Transactions of the Indian Institute of Metals

, Volume 71, Issue 10, pp 2575–2591 | Cite as

Effect of Material Position and Ultrasonic Vibration on Mechanical Behaviour and Microstructure of Friction Stir-Welded AA7075-T651 and AA6061 Dissimilar Joint

  • Yuvaraj Kunnathur PeriyasamyEmail author
  • Ashoka Varthanan Perumal
  • Darshan Rajasekaran
Technical Paper


In this research work, friction stir welding of dissimilar AA7075-T651 and AA6061 aluminium alloys has been carried out by varying the material position and power of ultrasonic vibration (UV). Material flow, microstructure, hardness and tensile properties of the weld joint were mainly discussed . Results showed that the position of an AA7075-T651 material in the advancing side and ultrasonic power of 1.5 kW exhibited maximum tensile strength, hardness and bending strength. Elongation decreased with an increase in UV power. When using 1.5 kW UV power, the formation of multiple vortexes and distinct layers in the weld nugget zone improved the dissimilar joint property. A micro-void formation resulted from the lack of material filling and excessive turbulence when the UV power increased to 2 kW. The maximum compressive load of 50 kN was attained for the bending angle of 44° at 1.5 kW UV power. On increasing the ultrasonic power, dimples elongated and glided along the weld zone to cause void and tunnel formation .


Friction stir welding Ultrasonic vibration Tensile strength Hardness Bending strength 


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Copyright information

© The Indian Institute of Metals - IIM 2018

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringSri Krishna College of Engineering and TechnologyCoimbatoreIndia

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