Journal
MATERIALS & DESIGN
Volume 50, Issue -, Pages 872-878Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2013.03.105
Keywords
Self-reacting friction stir welding; Welding tool; Microstructures; Welding speed; Mechanical properties
Categories
Funding
- National Natural Science Foundation of China [51175117]
- National Basic Research Program of China [2010CB731704]
- National Science and Technology Major Project of China [2010ZX04007-011]
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The 4 mm thick 6061-T6 aluminum alloy was self-reacting friction stir welded at a constant tool rotation speed of 600 r/min. The specially designed self-reacting tool was characterized by the two different shoulder diameters. The effect of welding speed on microstructure and mechanical properties of the joints was investigated. As the welding speed increased from 50 to 200 mm/min, the grain size of the stir nugget zone increased, but the grain size of the heat affected zone was almost not changed. So-called band patterns from the advancing side to the weld center were detected in the stir nugget zone. The strengthening meta-stable precipitates were all diminished in the stir nugget zone and the thermal mechanically affected zone of the joints. However, considerable amount of beta' phases, tending to reduce with increasing welding speed, were retained in the heat affected zone. The results of transverse tensile test indicated that the elongation and tensile strength of joints increased with increasing welding speed. The defect-free joints were obtained at lower welding speeds and the tensile fracture was located at the heat affected zone adjacent to the thermal mechanically affected zone on the advancing side. (C) 2013 Elsevier Ltd. All rights reserved.
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