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Advances in Materials Science and Engineering
Volume 2014 (2014), Article ID 980636, 8 pages
Research Article

Unstable Temperature Distribution in Friction Stir Welding

1Universiti Teknikal Malaysia Melaka (UTeM), Melaka, Malaysia
2Foundation of Technical Education, Baghdad, Iraq

Received 5 June 2014; Revised 4 August 2014; Accepted 4 August 2014; Published 9 September 2014

Academic Editor: George Z. Kyzas

Copyright © 2014 Sadiq Aziz Hussein et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In the friction stir welding process, a nonuniform and high generated temperature is undesirable. Unstable temperature and distribution affect thermal and residual stresses along the welding line, thus necessitating mitigation. This paper presents a simple method to prevent significant temperature difference along the welding line and also to help nullifying some defect types associated with this welding, such as end-hole, initial unwelded line, and deformed areas. In the experimental investigation, a heat and force thermocouple and dynamometer were utilized while couple-field thermomechanical models were used to evaluate temperature and its distribution, plastic strain, and material displacement. The suggested method generated uniform temperature distributions. Measurement results are discussed, showing a good correlation with predictions.