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Mechanical Performance of Friction Stir Linear Welds of Al to Mg Alloys
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 28, 2017 by SAE International in United States
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Lightweight metals such as Al and Mg alloys have been increasingly used for reducing mass in both structural and non-structural applications in transportation industries. Joining these lightweight materials using traditional fusion welding techniques is a critical challenge for achieving optimum mechanical performance, due to degradation of the constituent materials properties during the process. Friction stir welding (FSW), a solid-state joining technique, has emerged as a promising method for joining these lightweight materials. In particular, high joining efficiency has been achieved for FSW of various Al alloys and Mg alloys separately. Recent work on FSW of dissimilar lightweight materials also show encouraging results based on quasi-static shear performance. However, coach-peel performance of such joints has not been sufficiently examined. In this study, a rolled Al alloy AA6022 and a high pressure die cast Mg alloy AM60 were friction stir linear welded (FSLW) in a lap configuration under various welding speeds. Both lap-shear and coach-peel performances of the dissimilar welds under quasi-static conditions were evaluated, indicating high lap-shear strength, but much lower coach-peel strength. The ratio of coach-peel to lap-shear failure load is between 0.19 and 0.34. The dramatic differences in weld performance under different loading configurations are explored through metallurgical and fractography analysis. Moreover, the lap-shear performance of weld-bonded FSLW joints is explored, displaying a noteworthy increase in the load-bearing capacity upon addition of structural adhesives.
CitationYuan, W., Jordon, B., Ghaffari, B., Rao, H. et al., "Mechanical Performance of Friction Stir Linear Welds of Al to Mg Alloys," SAE Technical Paper 2017-01-0467, 2017, https://doi.org/10.4271/2017-01-0467.
- Mordike B.L. , Ebert T. Magnesium: Properties – applications – potential Mater. Sci. Eng. A 302 2001 37 45
- Mishra R.S. , Ma Z.Y. Friction stir welding and processing Mater. Sci. Eng. R 50 2005 1 78
- Sato Y.S. , Park S.H.C. , Michiuchi M. , Kokawa H. Constitutional liquation during dissimilar friction stir welding of Al and Mg alloys Scripta Mater. 50 2004 1233 1236
- Sato Y.S. , Shiota A. , Kokawa H. , Okamoto K. , Yang Q. , Kim C. Effect of interfacial microstructure on lap shear strength of friction stir spot weld of aluminum alloy to magnesium alloy Sci. Technol. Weld. Joining 15 2010 319 324
- Choi D.-H. , Ahn B.-W. , Lee C.-Y. , Yeon Y.-M. , Song K. , Jung S.-B. Formation of intermetallic compounds in Al and Mg alloy interface during friction stir spot welding Intermetallics 19 2011 125 130
- Chowdhury S.H. , Chen D.L. , Bhole S.D. , Cao X. , Wanjara P. Lap shear strength and fatigue life of friction stir spot welded AZ31 magnesium and 5754 aluminum alloys Mater. Sci. Eng. A 556 2012 500 509
- Rao H.M. , Yuan W. , Badarinarayan H. Effect of process parameters on mechanical properties of friction stir spot welded magnesium to aluminum alloys Mater. Design 66 2015 235 245
- Rao H.M. , Ghaffari B. , Yuan W. , Jordon J.B. , Badarinarayan H. Effect of process parameters on microstructure and mechanical behaviors of friction stir linear welded aluminum to magnesium Mater. Sci. Eng. A 651 2016 27 36
- Rao H.M. , Jordon J.B. , Ghaffari B. , Su X. , Khosrovaneh A.K. , Barkey M.E. , Yuan W. , Guo M. Fatigue and fracture of friction stir linear welded dissimilar aluminum-to-magnesium alloys Int J Fatigue 82 2016 737 747
- Lee C.-Y. , Choi D.-H. , Y.-Yeon M. , Jung S.-B. Dissimilar friction stir spot welding of low carbon steel and Al-Mg alloy by formation of IMCs Sci. Technol. Weld. Joining 14 2009 216 220
- Bozzi S. , Helbert-Etter A.L. , Baudin T. , Criqui B. , Kerbiguet J.G. Intermetallic compounds in Al 6016/IF-steel friction stir spot welds Mater. Sci. Eng. A 527 2010 4505 4509
- Chen Y.C. , Nakata K. Effect of tool geometry on microstructure and mechanical properties of friction stir lap welded magnesium alloy and steel Mater. Design 30 2009 3913 3919
- Liyanage T. , Kilbourne J. , Gerlich A.P. , North T.H. Joint formation in dissimilar Al alloy/steel and Mg alloy/steel friction stir spot welds Sci. Technol. Weld. Joining 14 2009 500 508
- Kumar N. , Yuan W. and Mishra R. S. Friction Stir Welding of Dissimilar Alloys and Materials, 1st Edition A Volume in Friction Stir Welding and Processing Butterworth-Heinemann 978-0-12-802418-8 2015
- Liu L. and Ren D. A novel weld-bonding hybrid process for joining Mg alloy and Al alloy Mater. Design. 32 2011 3730 3735
- Yuan W. , Shah K. , Ghaffari B. and Badarinarayan H. Friction stir welding of dissimilar lightweight metals with addition of adhesive Friction Stir Welding and Processing VIII 125 135