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The influence of tool geometry on the thermo-mechanical and microstructural behaviour in friction stir welding of AA5086

Jamshidi Aval, H ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1243/09544062JMES2267
  3. Publisher: 2011
  4. Abstract:
  5. In this work, the effect of tool geometric parameters on thermo-mechanical behaviour in friction stir welding of AA5086 has been investigated. For doing so, the thermo-mechanical responses of material during welding with different tools have been predicted by a three-dimensional finite-element model using the finite-element code ABAQUS. In addition, welding experiments have been carried out to study the developed microstructures and the mechanical properties of welded alloy. The results show that tool geometry significantly affects the energy input, deformation pattern, plunge force, microstructures, and mechanical properties of the joint. The conical tool with the shoulder angle of 2° has been found to produce a larger deformation region as well as higher mechanical properties comparing with the cylindrical tools employed in this research. Additionally, tensile residual stresses are developed within the region around the weld centre-line, which gradually changes to compressive ones beyond the heat-affected zone. It is found that the ratio of heat generation from plastic to friction dissipation in the conical threaded pin is 44 per cent more than the cylindrical pin with similar shoulder diameter
  6. Keywords:
  7. 5086 aluminium alloy ; Thermo-mechanical model ; Deformation pattern ; Deformation region ; Energy inputs ; Finite-element codes ; Finite-element models ; Friction stir ; Geometric parameter ; Micro-structural ; Shoulder angle ; Tensile residual stress ; Thermo-mechanical ; Thermomechanical model ; Tool geometry ; Aluminum ; Aluminum alloys ; Computational geometry ; Deformation ; Equipment ; Finite element method ; Friction ; Gas welding ; Heat affected zone ; Mechanical properties ; Three dimensional ; Tribology ; Friction stir welding
  8. Source: Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science ; Volume 225, Issue 1 , 2011 , Pages 1-16 ; 09544062 (ISSN)
  9. URL: http://pic.sagepub.com/content/225/1/1.abstract