Material flow and void defect formation in friction stir welding of aluminium alloys |
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| Authors: | X. H. Zeng D. Wang D. R. Ni B. L. Xiao K. S. Wang |
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| Affiliation: | 1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, People’s Republic of China;2. School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an, People’s Republic of China |
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| Abstract: | An ingenious experimental programme by combining artificially thickened oxide layer as marker material and ‘stop-action’ welding were used to study the material flow and defect formation in friction stir welding of aluminium alloys. The results showed that material flow around the pin on the advancing side (AS) was severer than that on the retreating side (RS) and the fastest velocity of material flow in the middle stir zone (SZ) was 43.9?mm?s?1. Moreover, the material under the RS shoulder included extruded metal only and the material under the AS shoulder included extruded and rotated metal. Lastly, instantaneous void occurrence and insufficient inflow material were reasons for the preferential formation of void defects in the top SZ on the AS. |
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| Keywords: | Aluminium alloys friction stir welding deformation material flow void defect |
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