Terminology in friction stir welding

In an attempt to avoid confusion and duplication, TWI proposed an initial basic terminology at an early stage of the development of friction stir welding ( FSW). This terminology has since been revised and extended in consultation with licensees and other interested parties, to the form summarised in this paper. A definitive standard on FSW is being prepared by Working Group B1 of Commission III of the International Institute of Welding, and it is expected that this will be adopted as an ISO standard.