The level of activity in research on the friction stir welding of steels is dwarfed when compared with that on aluminium alloys. There are good reasons for this. The relative weakness of aluminium makes it ideally suited for a process which requires at high strain rates, the permanent flow and mixing of material without melting. In contrast, there are in general no cost-effective tools available for steel. The purpose of this article and the associated papers in this special issue of STWJ is to assess the state-of-the-art, focusing on the knowledge base in the open literature.
Science and Technology of Welding and Joining 14 (2009) 193-196.
Related paper: Recent Advances in Friction Stir Welding
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