Counter rotating twin-tool system in friction stir welding process: A simulation study

摘要

In the current paper a comparative study between twin-tool and conventional friction stir welding tool by using a numerical method is carried out based on temperature distribution, strain, material flow and material velocity. The model is validated with experimentally measured temperature for both the cases and a good correlation is observed. Twin-tool generates higher maximum and minimum temperatures over the conventional FSW having a single-tool. Lower thermal gradients along transverse and thickness directions are achieved for twin-tool as compared to the conventional FSW. In twin-tool, strain distribution is symmetric contrary to the asymmetry in conventional FSW. Material deposition is closer to its original location in case of twin-tool as compared to conventional FSW leading to lower chances of defects in the former.