Some studies on mechanical properties of friction stir butt welded Al-6082-T6 plates
The conventional fusion welding of cast aluminium alloys is generally difficult due to some common defects such as porosity, oxide inclusion, and hot cracking, which in turn reduce the weld strength. In recent years, friction stir welding (FSW) was found to be very effective for the welding of various wrought aluminum alloys. This paper investigates a metal joining process called Friction Stir Welding (FSW), an innovative welding technique invented by TWI Ltd. in Great Britain in 1991. The purpose of the paper is to study the effects of process parameters in the butt welding of Al-6082-T6 plates with a thickness of 3 mm. Joints were made using different combinations of tool rotation speed, welding speed, and axial force, each at different levels. The quality of weld zone was analyzed using macrostructure. The study aims in identifying the process parameters of welding the Al6082 alloy and the effect of welding speed on the weld performance of the joint was investigated by conducting tensile and hardness tests.
Process modelling applied to 6082-T6 aluminium weldments—II. Applications of model
Abstract The second part of this investigation is concerned with the application of the model developed in Part I for prediction of strength losses in the heat affected zone (HAZ) of 6082-T6 aluminium weldments. In particular, attempts have been made to construct a series of diagrams which summarize information about the effect of important welding variables in a systematic and illustrative manner. These diagrams are subsequently used for an evaluation of recommended safety factors for the reduced strength zone of AlMgSi weldments.
SR topography of plastically deformed Fe-Si bicrystals - observation in situ and post mortem
SR reflection topography was applied to study the interaction of slip dislocations with the grain boundaries in Fe-4at%Si bicrystals deformed by compression. Three experimental settings with either a white or monochromatic beam were used and the corresponding orientation contrast analysed. Dislocation transmission through the grain boundary was observed in bicrystals with favourable geometry of the slip systems.