Effect of hook characteristics on the fracture behaviour of dissimilar friction stir welded aluminium alloy and mild steel sheets |
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| Authors: | Tianhao Wang Harpreet Sidhar Yuri Hovanski Piyush Upadhyay Blair Carlson |
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| Affiliation: | 1. Center for Friction Stir Processing, Department of Materials Science and Engineering, University of North Texas, Denton, TX, USA;2. Manufacturing Engineering Technology, Brigham Young University, Provo, UT, USA;3. Pacific Northwest National Laboratory, Energy Materials and Manufacturing, Richland, WA, USA;4. General Motors Technical Center, Warren, MI, USA |
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| Abstract: | ABSTRACTUnder tensile shear loading, fracture modes of dissimilar lap welds produced by friction stir scribe technology were studied. Three fracture modes were observed. For zone A fracture, the initial crack was restrained, and the joint ultimately fractured in the base mild steel. For zone B fracture, the initial crack progressed through the aluminium sheet just above the Al/steel interface. For zone C fracture, the initial crack proceeded along the steel hook to the aluminium sheet surface. Fracture mode and joint strength were greatly influenced by steel hook size, and the steel hook size was affected by welding parameters and tool scribe height. In this study, the experimental joint strength achieved the calculated joint load limit. |
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| Keywords: | Friction stir scribe dissimilar fracture hook characteristic paint bake cycle digital image correlation |
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