The Effect of Post-weld Heat Treatment on the Corrosion Behavior of Different Weld Zones of Titanium Ti-6Al-4V Alloy by Friction Stir Welding

2020 ◽  
Vol 29 (10) ◽  
pp. 6784-6789
Author(s):  
Alireza Nasresfahani ◽  
Abdol Reza Soltanipur ◽  
Khosro Farmanesh ◽  
Ali Ghasemi
Keyword(s):  
Heat Treatment ◽  
Friction Stir Welding ◽  
Corrosion Behavior ◽  
Post Weld Heat Treatment ◽  
Friction Stir ◽  
Weld Heat

scholarly journals Sequential Effects of Deep Rolling and Post-Weld Heat Treatment on Surface Integrity of AA7075-T651 Aluminum Alloy Friction Stir Welding

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3510 ◽  
Author(s):  
Adirek Baisukhan ◽  
Wasawat Nakkiew
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Aluminum Alloy ◽  
Fatigue Life ◽  
Friction Stir Welding ◽  
Surface Integrity ◽  
Post Weld Heat Treatment ◽  
Deep Rolling ◽  
Friction Stir ◽  
Weld Heat

The aim of this research is to investigate the sequence of processes for improving the welded surface integrity of AA7075-T651 aluminum alloy joined by friction stir welding (FSW). The improvement processes that will be investigated herein include mechanical surface improvement with deep rolling (DR) and post-weld heat treatment (PWHT). Therefore, this study investigated welded surface integrity, which comprises residual stress, microhardness, surface roughness, microstructure, and fatigue life (screening). The experiment consists of three sets of combinations. In the first set, only FSW was applied; in the second set, FSW was applied, followed by DR, and then PWHT processes (FSW-DR-PWHT); and in the last set, FSW was applied, followed by PWHT, and then DR processes (FSW-PWHT-DR). Fatigue testing was carried out by undertaking a four-point bending test using a bending stress of approximately 300 MPa with a test frequency of 2.5 Hz at room temperature and stress ratio R = 0. The study found that residual stress plays an important role in the fatigue life. Finally, the fatigue test showed that FSW workpieces subject to the PWHT process followed by the DR process (FSW-PWHT-DR) had the highest fatigue life, with an increase of 239% when compared with unprocessed FSW workpieces.

Friction Stir Welding of Al-Li AA2199: Parameters, Precipitates and Post Weld Heat Treatment

2011 ◽  
Vol 409 ◽  
pp. 853-858
Author(s):  
Rosen Ivanov ◽  
Julien Boselli ◽  
Diana Denzer ◽  
Daniel Larouche ◽  
Raynald Gauvin ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Friction Stir Welding ◽  
Weld Zone ◽  
Base Material ◽  
Post Weld Heat Treatment ◽  
Second Phase ◽  
Friction Stir ◽  
Tool Rotation ◽  
Weld Heat

The aerospace industry strives to develop materials allowing an increase in payload and reducing fuel consumption. Al-Li alloys, with their low density and high strength are currently in use for such applications and have potential for additional applications. When compared to composites, utilizing Al-Li alloy products is cost effective for aerospace companies as they do not need to redesign pre-existing fabrication facilities. The joining of these alloys by conventional methods is limited by segregation of alloying elements and the formation of oxides during high temperature exposure. This study focuses on solid state joining method that has the potential to generate low heat and be defect free - Friction Stir Welding (FSW). AA2199 sheets were joined by FSW. Process variables included table force, tool rotation speed and weld travel speed. A post weld heat treatment (PWHT) was applied to improve the mechanical properties by precipitation of strengthening phases. An increase in hardness of the weld zone from 95HV to 125HV upon PWHT was recorded for selected welding conditions. The type and morphology of second phase precipitates is deemed responsible for this effect. It is suggested that the high temperature and high strain levels characteristic of welds with fast tool rotation allow for the dissolution of precipitates during welding. The re-precipitation of these second phases during PWHT allowed the welds to recover strength to the level of the base material.

scholarly journals Effect of friction stir welding and post-weld heat treatment on a nanostructured ferritic alloy

2016 ◽  
Vol 469 ◽  
pp. 200-208 ◽  
Author(s):  
B. Mazumder ◽  
X. Yu ◽  
P.D. Edmondson ◽  
C.M. Parish ◽  
M.K. Miller ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Friction Stir Welding ◽  
Post Weld Heat Treatment ◽  
Ferritic Alloy ◽  
Friction Stir ◽  
Weld Heat

Influences of Friction Stir Welding and Post-Weld Heat Treatment on Al-Cu-Li Alloy

2017 ◽  
Vol 20 (2) ◽  
pp. 1700652 ◽  
Author(s):  
Yi Lin ◽  
Change Lu ◽  
Chengyang Wei ◽  
Ziqiao Zheng
Keyword(s):  
Heat Treatment ◽  
Friction Stir Welding ◽  
Post Weld Heat Treatment ◽  
Friction Stir ◽  
Weld Heat

Microstructural Evolution in AA7449 Plate Subject to Friction Stir Welding and Post Weld Heat Treatment

2006 ◽  
Vol 519-521 ◽  
pp. 1181-1186 ◽  
Author(s):  
A. Sullivan ◽  
Nicolas Kamp ◽  
Joseph D. Robson
Keyword(s):  
Heat Treatment ◽  
Friction Stir Welding ◽  
Phase Particle ◽  
Parent Material ◽  
Post Weld Heat Treatment ◽  
Second Phase ◽  
Hardness Profile ◽  
Friction Stir ◽  
The Difference ◽  
Weld Heat

The effect of friction stir welding (FSW) and post weld heat treatment (PWHT) on the second phase particle distribution and cross weld hardness profile in AA7449 plate has been investigated. The alloy was received in an underaged condition, welded, then PWHT to give an overaged condition (in the parent material) . The effect of this complex treatment on the precipitate distribution in the weld and parent plate has been investigated over a range of length scales using small angle X-ray scattering (SAXS), TEM and FEGSEM. It is shown that the PWHT does not improve the hardness in the heat affected zone (HAZ), which is the location of the strength minimum after welding, but it does reduce the difference between the hardness in the HAZ and the nugget and parent hardness. The reduction in nugget strength after PWHT is particularly marked and is due to replacement of fine GP zones formed on post weld natural ageing by coarse overaged precipitates.

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