Influence of Complete Tool-Offset Position on Intrinsic Microstructure and Its Effect on Fatigue Life of AA2024 Alloy-Copper Joint Made by Friction Stir Welding

2021 ◽  
Vol 11 (2) ◽  
pp. 20200170
Author(s):  
Anbukkarasi Rajendran ◽  
Rajneesh Hariharan ◽  
Satish Vasu Kailas
Keyword(s):  
Fatigue Life ◽  
Friction Stir Welding ◽  
Friction Stir ◽  
Tool Offset

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.

scholarly journals Experimental notched fracture resistance study for the interface of Al–Cu bimetal joints welded by friction stir welding

2017 ◽  
Vol 232 (12) ◽  
pp. 2192-2200 ◽  
Author(s):  
Mohammad Reza Mohammad Aliha ◽  
Yassin Fotouhi ◽  
Filippo Berto
Keyword(s):  
Friction Stir Welding ◽  
Fracture Strength ◽  
Pure Copper ◽  
Interface Fracture ◽  
Welding Parameters ◽  
Load Bearing Capacity ◽  
Dissimilar Joints ◽  
Friction Stir ◽  
Tool Offset ◽  
Point Bend

Strength and load-bearing capacity of dissimilar joints welded by friction stir welding is one of the most interesting subjects for optimizing this recently developed joining technique. Hence, in this article, dissimilar butt weldments of pure copper with Al5083 are manufactured with different welding parameters (including pin rotational and tool offset). Then rectangular beam specimens containing right angle notches in the interface of joints were prepared from the welded plates and tested under three-point bend loading to investigate the interface fracture strength of Al–Cu joints. The results showed the significant influence of welding parameters on the strength and load–displacement curves of the tested bimetals. It was shown that considering a suitable value for the offset of pin can increase the interface fracture strength. The highest fracture loads were achieved at moderately lower pin rotational speeds.

Fatigue life of A6061/SUS304 dissimilar materials made by friction stir welding

2019 ◽  
Vol 2019.72 (0) ◽  
pp. F35
Author(s):  
Eishin SUZUKI ◽  
Yasuhiro UEDA ◽  
Atsuhiro KOYAMA ◽  
Toru TAKASE ◽  
Masayuki AKITA ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Friction Stir Welding ◽  
Dissimilar Materials ◽  
Friction Stir

Residual Stresses in Dissimilar Friction Stir Welding of AA2024 and AZ31: Experimental and Numerical Study

2018 ◽  
Vol 140 (5) ◽  
Author(s):  
Z. Hou ◽  
J. Sheikh-Ahmad ◽  
F. Jarrar ◽  
F. Ozturk
Keyword(s):  
Friction Stir Welding ◽  
Residual Stresses ◽  
Numerical Study ◽  
Stress Component ◽  
Weld Zone ◽  
Element Model ◽  
Maximum Temperature ◽  
Friction Stir ◽  
Tool Offset ◽  
Dissimilar Friction Stir Welding

Thermal history and residual stresses in dissimilar friction stir welding (FSW) of AA2024 and AZ31 were studied under different tool offsets using a coupled Eulerian–Lagrangian (CEL) finite element model and a mechanical model. Welding experiments and residual stresses' measurements were conducted to validate the models. Comparisons between the experimental and numerical results indicated good agreement. The maximum temperature in the welded zone was predicted to be slightly lower than 400 °C, regardless of offset, and that its location shifted with tool offset from the advancing side (AS) to the retreating side (RS). Longitudinal residual stresses changed from tensile under the tool shoulder to compressive beyond this region and it appeared to be the dominant stress component. The transverse stresses were tensile and of lower magnitude. Both the longitudinal and transverse residual stresses have their maximum values within the weld zone near the end of the weld length. For both peak temperatures and residual stresses, higher values were obtained at the AS with no tool offset and 1 mm offset to the AS, and at the RS with 1 mm offset to the RS. Lower residual stresses and better weld quality were obtained with tool offset to the aluminum side.

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