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Microstructure and Mechanical Properties of Hybrid Laser-Friction stir welding between AA6061-T6 Al Alloy and AZ31 Mg Alloy

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Journal of Materials Science & Technology 2011年第3期27卷 199-204页

作者： Woong-Seong Chang S.R.Rajesh Chang-Keun Chun Heung-Ju Kim welding Research Center Research Institute of Industrial Science and Technology

For the purpose of improving the strength of this dissimilarjoint, the present study was carried out to investigate the improvement in intermetallic layer by using a third material foil between the laying edges of the friction stir welded and hybrid welded AI6061-T6/AZ31 alloy plates. The difference in microstructural and mechanical characteristics of friction stir welded and hybrid welded AI6061-TO/AZ31 joint was compared. Hybrid butt- welding of aluminum alloy plate to a magnesium alloy plate was successfully achieved with Ni foil as filler material, while defect-free laser-friction stir welding （FSW） hybrid welding was achieved by using a laser power of 2 kW. Transverse tensile strength of the joint reached about 66% of the Mg base metal tensile strength in the case of hybrid welding with Ni foil and showed higher value than that of the friction stir welded joint with and without the third material foil. This may be due to the presence of less brittle Ni-based intermetallic phases instead of Al12Mg17.

关键词： frictions stir welding Laser welding Dissimilar metal joint Hybrid welding Magnesium alloy Aluminum alloy

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Optimization of process parameters to maximize ultimate tensile strength of friction stir welded dissimilar aluminum alloys using response surface methodology

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Journal of Central South University 2013年第11期20卷 2929-2938页

作者： R.Palanivel P.Koshy Mathews N.Murugan Kalaivani College of Technology Coimbatore Institute of Technology

Aluminium alloys generally present low weldability by traditional fusion welding process. Development of the friction stir welding （FSW） has provided an alternative improved way of producing aluminium joints in a faster and reliable manner. The quality of a weld joint is stalwartly influenced by process parameter used during welding. An approach to develop a mathematical model was studied for predicting and optimizing the process parameters of dissimilar aluminum alloy （AA6351 T6-AA5083 Hlll）joints by incorporating the FSW process parameters such as tool pin profile, tool rotational speed welding speed and axial force. The effects of the FSW process parameters on the ultimate tensile strength （UTS） of friction welded dissimilar joints were discussed. Optimization was carried out to maximize the UTS using response surface methodology （RSM） and the identified optimum FSW welding parameters were reported.

关键词： frictions stir welding dissimilar aluminum alloy tool pin profile design of experiments RSM material flow behavior optimization

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