On the Prediction of Hot Tearing in Al-to-Steel Welding by Friction Melt Bonding
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Aluminum alloy AA6061 was welded to dual-phase steel 980 (DP980) by the friction melt bonding (FMB) process. Hot tears have been suppressed by controlling the thermomechanical cycle. In particular, the welding speed and the thermal conductivity of the backing plate have been optimized. A finite-element thermomechanical model coupled with the Rappaz–Drezet–Gremaud (RDG) criterion has been used to explain these experimental observations. The hot tear susceptibility has been reduced with large thermal gradients and with the formation of a cellular microstructure. Both effects are favored by a backing plate made of a material with high thermal conductivity, such as copper.
The authors acknowledge the financial support of the Interuniversity Attraction Poles Program from the Belgian State through the Belgian Policy agency, contract IAP7/21 INTEMATE. N. Jimenez-Mena acknowledges the financial support of FRIA, Belgium. A. Simar acknowledges the financial support (from January 2017) of the European Research Council (ERC) under European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 716678).
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