scholarly journals Microstructure and pitting corrosion of armor grade AA7075 aluminum alloy friction stir weld nugget zone – Effect of post weld heat treatment and addition of boron carbide

2015 ◽  
Vol 11 (2) ◽  
pp. 166-173 ◽  
Author(s):  
P. Vijaya Kumar ◽  
G. Madhusudhan Reddy ◽  
K. Srinivasa Rao
Keyword(s):  
Heat Treatment ◽  
Aluminum Alloy ◽  
Boron Carbide ◽  
Pitting Corrosion ◽  
Post Weld Heat Treatment ◽  
Weld Nugget ◽  
Friction Stir Weld ◽  
Nugget Zone ◽  
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.

Effect of post weld heat treatment and welding parameters on mechanical and corrosion characteristics of friction stir welded aluminium alloy AA2014-T6

2019 ◽  
Vol 43 (2) ◽  
pp. 230-236
Author(s):  
Ashok S. Kannusamy ◽  
Ravindran Ramasamy
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Welding Process ◽  
Post Weld Heat Treatment ◽  
Welding Parameters ◽  
Friction Stir ◽  
Heat Treated ◽  
Ageing Period ◽  
Weld Heat

This paper addresses the effect of post weld heat treatment methods on the mechanical and corrosion characteristics of friction stir welded aluminum alloy AA2014-T6. Aluminum alloy AA2014 is mainly used in applications that demand high strength to weight ratios, such as aerospace, marine, and industrial applications. In this work, AA2014-T6 plates of 6 mm thick were butt welded using a tool with a square profile. Tensile strength, hardness, and corrosion characteristics were compared between the samples as welded and post weld heat treated. Welded samples that were heat treated for a shorter ageing period (8 h) showed improved tensile strength irrespective of welding process parameters, compared to as-welded samples. The samples heat treated for a longer ageing period (9 h) showed a decline in tensile strength for low tool rotation speed. Hardness increased in welded samples heat treated for 8 h. Welded samples heat treated for 9 h show high passivity in corrosion media.

Influences of post weld heat treatment on tensile strength and microstructure characteristics of friction stir welded butt joints of AA2014-T6 aluminum alloy

2016 ◽  
Vol 25 (3-4) ◽  
pp. 89-98 ◽  
Author(s):  
C. Rajendran ◽  
K. Srinivasan ◽  
V. Balasubramanian ◽  
H. Balaji ◽  
P. Selvaraj
Keyword(s):  
Heat Treatment ◽  
Aluminum Alloy ◽  
Artificial Aging ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Post Weld Heat Treatment ◽  
Butt Joints ◽  
Friction Stir ◽  
Microstructure Characteristics ◽  
Weld Heat

AbstractFriction stir welded (FSWed) joints of aluminum alloys exhibited a hardness drop in both the advancing side (AS) and retreating side (RS) of the thermo-mechanically affected zone (TMAZ) due to the thermal cycle involved in the FSW process. In this investigation, an attempt has been made to overcome this problem by post weld heat treatment (PWHT) methods. FSW butt (FSWB) joints of Al-Cu (AA2014-T6) alloy were PWHT by two methods such as simple artificial aging (AA) and solution treatment followed by artificial aging (STA). Of these two treatments, STA was found to be more beneficial than the simple aging treatment to improve the tensile properties of the FSW joints of AA2014 aluminum alloy.

Effect of Post Weld Heat Treatment on Strength and Microstructure of Friction Stir Welded Lap Joints of AA2014-T6 Aluminum Alloy

2019 ◽  
Vol 61 (5-6) ◽  
pp. 305-310 ◽  
Author(s):  
C. Rajendran ◽  
K. Srinivasan ◽  
V. Balasubramanian ◽  
H. Balaji ◽  
P. Selvaraj
Keyword(s):  
Heat Treatment ◽  
Aluminum Alloy ◽  
Lap Joints ◽  
Post Weld Heat Treatment ◽  
Friction Stir ◽  
Weld Heat

Influence of Post Weld Heat Treatment on Microstructure and Pitting Corrosion Behavior of Dissimilar Aluminium Alloy Friction Stir Welds

2019 ◽  
Vol 15 ◽  
pp. 109-118
Author(s):  
K. Sri Ram Vikas ◽  
V.S.N. Venkata Ramana ◽  
Raffi Mohammed ◽  
G. Madhusudhan Reddy ◽  
KSrinivasa Rao
Keyword(s):  
Heat Treatment ◽  
Aluminium Alloy ◽  
Corrosion Behavior ◽  
Pitting Corrosion ◽  
Post Weld Heat Treatment ◽  
Friction Stir ◽  
Weld Heat

scholarly journals Post-Weld Heat Treatment Effects on Hardness and Impact Strength of Aluminum Alloy 6061 Friction Stir Butt Weld

2015 ◽  
Vol 56 (7) ◽  
pp. 1072-1076 ◽  
Author(s):  
Jitlada Boonma ◽  
Sookkaew Khammuangsa ◽  
Kanokwan Uttarasak ◽  
Jirapan Dutchaneephet ◽  
Chatdanai Boonruang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Aluminum Alloy ◽  
Impact Strength ◽  
Treatment Effects ◽  
Post Weld Heat Treatment ◽  
Butt Weld ◽  
Friction Stir ◽  
Aluminum Alloy 6061 ◽  
Alloy 6061 ◽  
Weld Heat
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