Friction Stir Welding Characteristics of AZ31 Mg Alloy by Orthogonal Array

직교배열법에 의한 AZ31 마그네슘 합금의 마찰교반접합 특성

  • Kang, Dae-Min (School of Mechanical Engineering, Pukyong National University) ;
  • Park, Kyoung-Do (Graduate School, Pukyong National University) ;
  • Kang, Chung-Yun (School of Material Science and Engineering, Pusan National University)
  • Published : 2012.12.31

Abstract

Magnesium alloy has been focussed as lightweight material owing to its high strength even though low density with aluminum alloy, titanium alloy and plastic material. Friction stir welding technique was performed by rotating and plunging a shouldered tool with a small diameter pin into the joint line between two butted plates and useful to join magnesium alloy. In this paper, the experiments of friction stir welding were done to investigate the joint characteristics of AZ31 magnesium alloy. For its evaluation, the orthogonal array method$(L_{27}(3^{13}))$ was applied with four factors of pin diameter, shoulder diameter, travel speed and rotation speed of tool and also three levels of each factor. Nine tools were worked through shoulder diameter of 9, 12, 15mm and pin root diameter of 3, 4, 5mm. In addition tensile tests were excuted for the assessment of mechanical properties for joint conditions. From the results, pin diameter, shoulder diameter, and rotating speed of tool influenced on the tensile strength meaningful, but welding speed did not influence on that by the variance analysis. Beside of that, optimum condition of tensile strength was estimated as following ; shoulder diameter:15mm, welding speed:200mm/min, rotating speed:200rpm.

Keywords

References

  1. H. T. Kim, S. C. Kil, "Recent Research Trend of Friction Stir Welding Process", Spring Conference of The Korean Welding and Joining Society, Vol. 49, pp. 77-77, 2008.
  2. S. W. Song, N. K. Kim, C. Y. Kang, "Liquation Cracking of Mg and Al Alloys during Friction Stir Welding", Journal of The Korean Welding and Joining Society, Vol. 28, No. 5, pp. 28-34, 2010. https://doi.org/10.5781/KWJS.2010.28.5.028
  3. 2030 Automotive Technology and Outlook, The Korea Society of Automotive Engineers, 2010.
  4. K. S. Shin, H. C. Jung, Y. G. Na, "Application Status and Manufacturing Technologies of Magnesium Alloys in the Automotive Industry", Bulletin of the Korean Institute of Metals and Materials. 63-79, 2003.
  5. Thomas, W. M, Nicholas, E. D, Needham, J. C, Murch, M. G, Templesmith, P. and Dawes, C. J, G. B. Patent Application No. 9125978.8, 1991.
  6. Mishra, R. S. and Ma, Z. Y., "Friction Stir Welding and Processing", Materials Science and Engineering, R, No. 50, pp. 1-78, 2005.