Characterization of a dissimilar Al/steel joint with the influence of hot-tears.
Recently, multi-material assemblies for automobiles become attractive to lighten the vehicles and thus reduce the greenhouse gas emission while maintaining their crashworthiness. The combination of Al and steels is of a particular interest due to the lightweight of Al alloys and the high strength of steels. Although dissimilar welding of Al/steel brings some metallurgical challenges, the new Friction Melt Bonding technique developed at UCL enable to achieve good quality joints. Our previous study at ILL (Proposal 1-02-212) helped to understand the residual stresses (RS) near the Al-steel interface. Another recent finding in such weld bring the question of whether the formation of hot-tears is a RS relaxing mechanism in such welds or not. Experimental results indicated that many welds with minor hot-tears are stronger than welds without them. Thus, identifying the correlation between hot-tear and RS in a weld could provide a solution to make stronger and tougher welds. Thus, neutron diffraction measurements are required to understand the role of RS on the samples with and without hot tears, and that can shed a light in the understanding of hot tear formation in welded joints.
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Thaneshan SAPANATHAN; DREZET Jean-Marie; JACQUES Pascal; PIRLING Thilo and Aude Simar. (2018). Characterization of a dissimilar Al/steel joint with the influence of hot-tears.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-02-245
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