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• W298358467 abstract "A short theoretical foundation is presented that covers; heat treatment of aluminium to T6 condition, a brief overview of conditions that affect extrusion welding in aluminium and a few well-known methods for mechanical testing of weld quality. Provided experiment data on a simplified case of hollow profile extrusion will be investigated by the use of FEA on a constructed model. The model is used to create several simulation variants with different friction parameters. The construction and setup of simulation aims at exploiting the software tool’s capabilities to create an effective analysis. Simulations are run in an attempt to reproduce a known effect in a specific case of unlubricated hot extrusion of aluminium, namely the formation of a gas pocket at the bridge back end. Presented and discussed results includes: Load-stroke Material flow Strain rate distribution in the weld seam Pressure distribution in the weld seam The gas pocket effect is best reproduced by using a set shear friction, which deviates from earlier practice where manual sticking have been applied. As manually set sticking friction has been known to accurately represent material flow, a shear friction of m = 20 was set to emulate this as best as possible. Advantages of running with consistent shear friction includes; no need for manual intervention, the course of temperature distribution is gradual and simuation is able to predict pockets or lack of filling. Two previously extruded aluminium profiles were provided for study and mechanical weld testing. Existing test methods were considered before it was decided to go forth with ideas conceived in discussions with the teaching supervisor. The first concept named, the tensile tube test, was discontinued due to cost and time issues. The second concept named, the mandrel expansion test, lived to be manufactured and tested. In addition a reference experiment was also run to further validate the results. The mandrel expansion test proved itself able to distinguish between degrees of ductility, and is reckoned as successful. In the investigated profile it proved that the weld seam had lower ductility than the unwelded material. The work on both test methods is presented as an iterative account of the process from concept to discontinuity and practical execution." @default.
• W298358467 created "2016-06-24" @default.
• W298358467 creator A5002958061 @default.
• W298358467 date "2010-01-01" @default.
• W298358467 modified "2023-09-23" @default.
• W298358467 title "Welding mechanism and welding quality in extrusion welding" @default.
• W298358467 hasPublicationYear "2010" @default.
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