Volume 14, Issue 4 (3-2025)
مهندسی خوردگی 2025, 14(4): 66-66 |
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Heidari G R, Aliakbari S. Modification of GMAW Welds of
AA6061-T6 Aluminum Alloy by Friction
Stir Processing. مهندسی خوردگی 2025; 14 (4) :66-66
URL: http://journal.ica.ir/article-1-226-en.html
URL: http://journal.ica.ir/article-1-226-en.html
Assistant Professor, Corresponding author, Esfarayen University of Technology & Assistant Professor, Corresponding author, Esfarayen University of Technology
Abstract: (45 Views)
In this study two plates of AA6061-T6 aluminum alloy welded by gas metal arc welding technique.
Then the FSP process was conducted on as-welded samples without removing the weld caps. Results
showed that FSP modifies the microstructure and remove fusion weld defects. Friction stir processing
resulted in the increase of homogenous corrosion rate and the decrease of polarization resistance.
Corrosion rate and polarization resistance of GF100-900 sample was 0.018 mm/year and 18.7 kΩ,
respectively, whereas corrosion rate and polarization resistance of as weld sample was 0.015 mm/year
and 11.94 kΩ, respectively. Variation in rotational speed from 750 to 1050 rpm and traveling speed
from 50 to 200 mm/min resulted in minor changes (approximately 1μm) in the grain size of nugget
zone. The increase in rotational speed and the reduction in travel speed improved the homogeneity,
increased the size of weld nugget zone, decreased the grain size of nugget zone, reduced the corrosion
potential to more negative potential and increased the homogenous corrosion rate. Results also showed
that pitting corrosion was a major corrosion mechanism of all samples. The FSP process resulted in the
distribution of cathode inclusions and homogenous pitting corrosion. The FSP process resulted in the
reduction of the depth of pits and therefore increasing the pitting corrosion resistance
Then the FSP process was conducted on as-welded samples without removing the weld caps. Results
showed that FSP modifies the microstructure and remove fusion weld defects. Friction stir processing
resulted in the increase of homogenous corrosion rate and the decrease of polarization resistance.
Corrosion rate and polarization resistance of GF100-900 sample was 0.018 mm/year and 18.7 kΩ,
respectively, whereas corrosion rate and polarization resistance of as weld sample was 0.015 mm/year
and 11.94 kΩ, respectively. Variation in rotational speed from 750 to 1050 rpm and traveling speed
from 50 to 200 mm/min resulted in minor changes (approximately 1μm) in the grain size of nugget
zone. The increase in rotational speed and the reduction in travel speed improved the homogeneity,
increased the size of weld nugget zone, decreased the grain size of nugget zone, reduced the corrosion
potential to more negative potential and increased the homogenous corrosion rate. Results also showed
that pitting corrosion was a major corrosion mechanism of all samples. The FSP process resulted in the
distribution of cathode inclusions and homogenous pitting corrosion. The FSP process resulted in the
reduction of the depth of pits and therefore increasing the pitting corrosion resistance
Keywords: Gas metal arc welding (GMAW), Friction stir processing, Microstructure, Pitting
corrosion.
Type of Study: Research |
Subject:
General
Received: 2025/08/11 | Accepted: 2025/03/15 | Published: 2025/03/15
Received: 2025/08/11 | Accepted: 2025/03/15 | Published: 2025/03/15
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