Journal
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
Volume 20, Issue 3, Pages 259-265Publisher
SPRINGER
DOI: 10.1007/s12613-013-0721-8
Keywords
aluminum alloys; tungsten inert gas welding; heat input; aging; mechanical properties; microstructure
Categories
Funding
- Natural Science Foundation Project of Chongqing City [cstc2012jjA50002]
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Aging treatment and various heat input conditions were adopted to investigate the microstructural evolution and mechanical properties of TIG welded 6061-T6 alloy joints by microstructural observations, microhardness tests, and tensile tests. With an increase in heat input, the width of the heat-affected zone (HAZ) increases and grains in the fusion zone (FZ) coarsen. Moreover, the hardness of the HAZ decreases, whereas that of the FZ decreases initially and then increases with an increase in heat input. Low heat input results in the low ultimate tensile strength of the welded joints due to the presence of partial penetrations and pores in the welded joints. After a simple artificial aging treatment at 175 degrees C for 8 h, the microstructure of the welded joints changes slightly. The mechanical properties of the welded joints enhance significantly after the aging process as few precipitates distribute in the welded seam.
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