Behaviour of AlMg3 Base Material and its Friction Stir Welded Joints under Cyclic Loading Conditions

Abstract:

The friction stir welding (FSW) is a dynamically developing version of the pressure welding processes. Nowadays, the knowing of the properties and the behaviour of the welded joints is an important direction of the investigations, especially under cyclic loading. The research work aimed (i) to demonstrate the behaviour of the FSW welded joints under cyclic loading conditions; (ii) to confirm the applicability of the used friction welding technology. Experiments were performed on 5754-H22 aluminium alloy and its welded joints; both high cycle fatigue (HCF) and fatigue crack propagation (FCG) tests were executed. HCF limit curves were determined based on staircase method. Statistical behaviour of the base material and the welded joints under FCG was represented by the cutting of the specimens, in other words by the using of different crack paths. FCG limit curves can be determined by own developed six step method. The investigations and their results were compared with each other and with the results can be found in the literature.

• Periodical: Materials Science Forum (Volume 812)
• Pages: 155-160
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.812.155
• Online since: February 2015
• Authors: János Lukács*, Ákos Meilinger
• Keywords: Aluminium Alloy, Fatigue Crack Propagation (FCG), Friction Stir Welding (FSW), High Cycle Fatigue (HCF), Limit Curve

References

[1] W. S. Miller, et al., Recent development in aluminium alloys for the automotive industry, Materials Science and Engineering. A280 (2000) 37–49.

[2] P. Tindall, Aluminium in bridges, ICE Manual of Bridge Engineering, Institution of Civil Engineers. (2008) 345-355, doi: 10. 1680/mobe. 34525. 0345.

[3] C. B. Fuller, et al., Microstructure and mechanical properties of a 5754 aluminum alloy modified by Sc and Zr additions. Materials Science and Engineering A338 (2002) 8-16.

DOI: 10.1016/s0921-5093(02)00056-4

[4] R. S. Mishraa and Z. Y. Ma, Friction stir welding and processing, Materials Science and Engineering. R 50 (2005) 1–78.

[5] Friction Stir Welding. http: /www. twi. co. uk/technologies/welding-coating-and-material-processing/friction-stir-welding.

DOI: 10.1002/9781118062302.ch14

[6] A. Kostrivas and J. C. Lippold, Weldability of Li-bearing aluminium alloys, International Materials Reviews. 44 (1999) No. 6 217-237.

DOI: 10.1179/095066099101528289

[7] P. F. Mendez and T. W. Eagar, Welding processes for aeronautics, Advanced Materials and Processes. (2001) May 39-43.

[8] S. K. Chionopoulos, et al., Effect of tool pin and welding parameters on friction stir welded (FSW) marine aluminium alloys, in: K. -D. Bouzakis (Ed. ) Proc. of the 3rd ICMEN, EEDM and PCCM, Thessaloniki, 2008. pp.307-316.

[9] Á. Meilinger and I. Török, Formation and microstructure of friction stir welded joint, Hegesztéstechnika. 24 (2013) No. 4 35-38. (In Hungarian. ).

[10] Z. Barlas and U. Ozsarac, Effects of FSW Parameters on Joint Properties of AlMg3 Alloy. Welding Journal, 91 (2012) January 16-s-22-s.

[11] J. Li, The effect of microstructure and texture on high cycle fatigue properties of Al alloys, University of Kentucky, Doctoral Dissertations, Paper 522 (2007).

[12] M. Vural, et al., On the friction stir welding of aluminium alloys EN AW 2024-0 and EN AW 5754-H22, Archives of Materials Science and Engineering. 28 (2007) Issue 1, January 49-54.

DOI: 10.1002/mawe.201700096

[13] H. Nakazawa and S. Kodama, Statistical S-N testing method with 14 specimens: JSME standard method for determination of S-N curves, in: T. Tanaka, S. Nishijima, M. Ichukawa (Eds. ), Statistical Research on Fatigue and Fracture. Current Japanese Materials Research, Vol. 2. Elsevier Applied Science, London-New York, 1987. pp.59-69.

[14] P. Paris and F. Erdogan, A critical analysis of crack propagation laws, Journal of Basic Engineering, Transactions of the ASME. (1963) 528-534.

DOI: 10.1115/1.3656902