Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Friction Stir Welding of 7075-T651 Aluminum Plates and Its Fatigue Crack Growth Property

7075-T651 알루미늄 판재의 마찰교반용접과 피로균열전파 특성

  • Kim, Chi-Ok (Dept. of Mechanical Design Engineering, Graduate School, Pukyong National Univ.) ;
  • Sohn, Hye-Jeong (Dept. of Mechanical Design Engineering, Graduate School, Pukyong National Univ.) ;
  • Kim, Seon-Jin (Dept. of Mechanical and Automotive Engineering, Pukyong National Univ.)
  • Received : 2011.06.10
  • Accepted : 2011.08.18
  • Published : 2011.10.01
Download PDF
⟨ Previous Next ⟩

Abstract

Friction stir welding (FSW) method has extensively been used in manufacturing methods because of the several advantages over conventional welding methods, such as better mechanical properties, reduced occurrence of joining defects, high material saving, and low production time, etc. The aim of this paper is to review the optimal FSW conditions using the previous experimental results and is to investigate the fatigue crack growth rate in three different zones, WM, HAZ and BM for FSWed Al7075-T651 aluminum plates. As far as our experiments are concerned, the optimal conditions are obtained as rotation speed, 800rpm and travelling speed, 0.5mm/sec. The fatigue crack growth rate showed strong dependency on three different zones WM, HAZ and BM, and crack driving force.

마찰교반용접은 일반적인 용접법에 비하여 기계적 성질, 용접결함의 감소, 재료 절감 그리고 짧은 생산시간과 같은 장점 때문에 제작공정에 광범위하게 사용되고 있다. 본 연구의 목적은 이전의 실험 결과를 이용하여 마찰교반용접의 최적 조건을 검토하고 최적의 마찰용접조건에서 접합된 7075-T651 알루미늄 판재의 3가지 다른 영역, 즉 용접재, 열영향부재 그리고 모재에 대한 피로균열전파의 거동을 고찰하는 것이다. 최적의 마찰교반용접조건은 회전속도 800rpm, 이송속도 0.5mm/sec로 결정되었으며, 최적의 마찰교반용접에서 용접된 시험편에 대한 피로균열전파율은 3가지 영역의 재질, 즉 용접재, 열영향부재, 모재와 균열의 구동력에 크게 의존함을 보였다.

Keywords

References

  1. ASM, 1993, ASM Handbook, Welding, Brazing and Soldering, Vol. 6, ASM International, pp. 150-172.
  2. Thomas, W. M., Nicholas, E. D., Needham, J. C., Murcg, M. G., Templesmith, P. and Dawes, C. J., 1991, "Friction Stir Butt Welding," International Patent Application No. PCT/GB92/02203 and GB Patent Application No. 9125978.8, Dec. 1991, US Patent No. 5,460,317, Oct. 1995.
  3. Kim, M. S., 2009, Current State and Prospect of Domestic Friction Stir Welding Industry, Welding Technology, Vol. 8, pp. 51-62.
  4. Shtrikman, M. M., 2008, "Current State and Development of Friction Stir Welding," Welding Journal, Vol. 22, No. 11, pp. 806-815. https://doi.org/10.1080/09507110802593620
  5. Jang, S. K., Han, M. S. and Jeon, J. I., 2007, "Effects of Tool Rotation and Transition Speed during Friction Stir Welding of Al 7075-T651 Alloy," Trans. of the KSME (A), Vol. 31, No. 14, pp. 532-539. https://doi.org/10.3795/KSME-A.2007.31.4.532
  6. Shinoda, T. and Kondo, Y., 1997, "Friction Stir Welding of Aluminum Plate," Welding International, Vol. 11, No. 3, pp. 179-184. https://doi.org/10.1080/09507119709451948
  7. Sato, Y. S., Kokawa, H., Ikeda, K., Enomoto, M., Jogan, S. and Hashimoto, T., 2001, "Microtexture in Friction Stir Weld of an Aluminum Alloy," Metallurgical and Materials Transactions, Vol. 32A, pp. 941-948.
  8. Fuller, C. B., Manohney, M. W., Calabrese, M. and Micona, L., 2010, "Evolution of Microstructure and Mechanical Properties in Naturally Aged 7075 and 7075 Al Friction Stir Welds," Materials Science and Engineering A, Vol. 527, pp. 2233-2240. https://doi.org/10.1016/j.msea.2009.11.057
  9. Hatamleh, O., Forth, S. and Reynolds, A. P., 2010, "Fatigue Crack Growth of Peened Friction Stir-Welded 7075 Aluminum Alloy Different load Ratios," Journal of Materials Engineering Performance, Vol. 19, pp. 99-106. https://doi.org/10.1007/s11665-009-9439-1
  10. Jang, S. K. and Jeon, J. I., 2006, "Experimental Behaviors of Weld Zone Property of the Butt and Lap Jointed Specimen Friction-Stir-Welded with 2mm 1050 Aluminum Alloy Sheet," Trans. of the KSME (A), Vol. 30, No. 2, pp. 187-193. https://doi.org/10.3795/KSME-A.2006.30.2.187
  11. Friction Welding Working Group, 2006, Friction Welding Technology, Ilgankongupshimunsa, pp.176-264.
  12. Bussu, G. and Irving, P. E., 2003, "The Role of Residual Stress and heat Affected Zone Properties on Fatigue Crack Propagation in Friction Stir Welded 2024-T351 Aluminum Joints," International Journal of Fatigue, Vol. 25, pp. 77-88. https://doi.org/10.1016/S0142-1123(02)00038-5
  13. John, R., Jata, K. V. and Sadananda, K., 2003, "Residual Stress Effects on Near-Threshod Fatigue Crack Growth in Friction Stir Welds in Aerospace Alloys," International Journal of Fatigue, Vol. 25, pp. 939-948. https://doi.org/10.1016/j.ijfatigue.2003.08.002
  14. Kim, S. S., Lee, C. G. and Kim, S. J., 2008, "Fatigue Crack Propagation Behavior of Friction Stir Welded 5083-H31 and 6061-T651 Aluminum Alloys," Materials Science and Engineering A, Vol. 478, pp. 56-64. https://doi.org/10.1016/j.msea.2007.06.008
  15. Kim, C. O. and Kim, S. J., 2011, "Effect of Welding Condition on Tensile Properties of Friction Stir Welded Joints of Al 7075-T651 Plate," Trans. of KSPSE, Vol. 15, No. 2, pp. 61-68.
  16. Kim, C. O., Sohn, H. J. and Kim, S. J., 2011, "Effect of Welding Condition on Hardness and Microstructure of Friction Stir Welded Joints of Al 7075-T651 Plate," Trans. of KSPSE, Vol. 15, No. 3, pp. 58-64. https://doi.org/10.9726/kspse.2011.15.3.058
  17. Kim, S. J. and Oh. S. K., 1996, "Effect of Specimen Thickness on Probabilistic Fatigue Crack Growth," Proceedings of International Offshore and Polar Engineering Conference, Vol. 4, pp. 219-226.

Cited by

  1. Experimental Investigation of Fatigue Crack Growth Behavior in Friction Stir Welded 7075-T651 Aluminum Alloy Joints under Constant Stress Intensity Factor Range Control Testing (For LT Orientation Specimen) vol.37, pp.6, 2013, https://doi.org/10.3795/KSME-A.2013.37.6.775