Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 257, Issue -, Pages 257-269Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2018.03.002
Keywords
Hybrid tool pin; Friction stir welding; Thick; AA2219 Al alloy
Funding
- Defence Research and Development Organization
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The friction stir welds o thick precipitation-hardenable aluminum alloys suffer from reduced joint strength due to dissolution/coarsening of the strengthening precipitates. The article portray hybrid pin profiled tool that enables sound welds at speeds 7-times faster than a conventional tool (a conical threaded tool), without pin breakage. The conical threaded and triangular cross-section in the upper and lower pin half-lengths of the hybrid tool facilitate material flow in a downward direction and shear deformation at a faster rate, respectively. The paper brings out the process mechanism responsible for the enhanced welding speed and mechanical properties obtainable with the hybrid tool through a case of 13-mm thick aluminum alloy AA2219-T6. The hybrid tool facilitates a 26% improvement in weld strength by reducing TMAZ softening, as evidenced by the microhardness and mechanical properties and supported by microstructural investigation and fractography.
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