INFLUENCES OF TOOL TRAVEL SPEED ON TENSILE PROPERTIES OF UNDERWATER FRICTION STIR WELDED HIGH STRENGTH ARMOUR GRADE ALUMINIUM ALLOY JOINTS

Authors

  • Sree Sabari S Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar – 608 002, Tamil Nadu, India.
  • Malarvizhi S Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar – 608 002, Tamil Nadu, India.
  • Balasubramanian V Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar – 608 002, Tamil Nadu, India.

Keywords:

Underwater friction stir welding, tool travel speed, microstructure, tensile properties, microhardness

Abstract

AA2519-T87 armour grade aluminium alloy is relatively a new class of Al-Cu alloy which has high toughness, high strength to weight ratio and ballistic properties. Because of these properties, this alloy is recently used for fabricating light combat armour vehicles. However, fusion welding of this alloy will end up with solidification defects like porosity, hot cracking, etc. To overcome these problems, friction stir welding (FSW) process can be used. Though in FSW, the joining of materials takes place below the melting temperature, the heat generated is enough to coarsen or dissolve the strengthening precipitates in the age hardenable Al alloys. To avoid the detrimental precipitation behaviour, under water friction stir welding (UWFSW) process can be employed. The effect of tool travel speed (TTS) on heat input and resultant mechanical properties will be entirely different in conventional FSW and UWFSW process. Hence this investigation is carried out to study the effect of TTS on the stir zone characteristics and the resultant tensile properties of the UWFSW joints. From this investigation, it is found that the joint made using TTS of 30 mm/min exhibited superior tensile properties and this may be attributed to the lower heat generation, higher grain boundary strengthening and narrowing of the lower hardness distribution region (LHDR).

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Published

2016-06-01

How to Cite

[1]
Sree Sabari S, Malarvizhi S, and Balasubramanian V, “INFLUENCES OF TOOL TRAVEL SPEED ON TENSILE PROPERTIES OF UNDERWATER FRICTION STIR WELDED HIGH STRENGTH ARMOUR GRADE ALUMINIUM ALLOY JOINTS”, JME, vol. 11, no. 2, pp. 094–100, Jun. 2016.

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