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Corrosion behavior of aluminum 6061 alloy joined by friction stir welding and gas tungsten arc welding methods

Fahimpour, V ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.matdes.2012.02.043
  3. Abstract:
  4. Wrought aluminum sheets with thickness of 13. mm were square butt-welded by friction stir welding (FSW) and gas tungsten arc welding (GTAW) methods. Corrosion behavior of the welding zone was probed by Tafel polarization curve. Optical metallography (OM) and scanning electron microscopy together with energy dispersive spectroscopy (SEM-EDS) were used to determine morphology and semi-quantitative analysis of the welded zone. FSW resulted in equiaxed grains of about 1-2 μm, while GTAW caused dendritic structure of the welded region. Resistance to corrosion was greater for the FSW grains than the GTAW structure. In both cases, susceptibility to corrosion attack was greater in the welded region than the base metal section. T6 heat treatment resulted in shifting of the corrosion potential towards bigger positive values. This effect was stronger in the welded regions than the base metal section
  5. Keywords:
  6. Base metals ; Corrosion attack ; Corrosion behavior ; Corrosion potentials ; Dendritic structures ; Equi-axed grains ; Gas tungsten arc welding ; Optical metallography ; Positive value ; SEM-EDS ; Semi-quantitative analysis ; T6 heat treatment ; Tafel polarization ; Welding zones ; Wrought aluminum ; Corrosive effects ; Electric welding ; Energy dispersive spectroscopy ; Gas metal arc welding ; Gas welding ; Scanning electron microscopy ; Friction stir welding
  7. Source: Materials and Design ; Volume 39 , 2012 , Pages 329-333 ; 02641275 (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S0261306912001008