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Lecture No.145

Title: Three-dimensional visualization of material flow during friction stir welding by two pairs of X-ray transmission systems

 

Speaker: Professor Hidetoshi FUJIIJoining and Welding Research Institute of Osaka University

 

Date/Time: 2014-07-03,14:3015:30

 

Venue: Room.308, Material Building A

 

Inviter: Prof Liming PENG

 

 

Biography:

 Professor Hidetoshi FUJII.CV.pdf

 

 

Abstract:

 

Three-dimensional visualization of material flow during friction stir welding by two pairs of X-ray transmission systems

Hidetoshi FUJII

Joining and Welding Research Institute of Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka, Japan

Material flow is a key phenomenon to obtain sound joints by FSW, and it is affected by the welded material. However, the material flow during FSW has not been totally clarified. It seems to be difficult to understand the material flow by traditional methods such as the tracer method, observation of the microstructure in the stir zone and simulations. Therefore, in this study, the material flows of steel and aluminum were three-dimensionally visualized by X-ray radiography using a tiny spherical tungsten tracer. The movement of the tracer during the friction stir welding was observed by two pairs of x-ray transmission real-time imaging systems. The three-dimensional material flow is also obtained by observing locus of the tracer. The result revealed the defect formation mechanism, the velocity distribution of the flow, the effect of the welded material on the material flow.field.

Time:2014-07-03,14:30—15:30
Location:Room.308, Material Building A