Material flow behavior during friction stir welding of aluminum

摘要: Friction stir welding (FSW) is a new technique for joining aluminum alloys. Invented in 1991 at The Welding Institute (Ref. 1), this results low distortion and high joint strength compared with other techniques, capable of all To date, the majority research has concentrated on developing tools procedures making reliable welds variety alloys, characterizing properties design allowables (Refs. 2-7). However, very little known about material flow behavior during welding. purpose current study to document movement friction as means conceptual model deformation process. In paper, two techniques visualizing patterns are presented. Based measured 6061 7075 aluminum, within by either simple extrusion or chaotic mixing, depending where weld zone originates. These impact development suggest ways process predicting tool performance.