1. G R O U P M E M B E R S :
U M E R S H A H A B ( 2 0 1 4 4 4 3 )
T A L H A N A S I R K H A N L O D H I ( 2 0 1 4 3 8 3 )
M I A N M U H A M M A D H U S S A I N ( 2 0 1 4 1 6 9 )
A D V I S O R : D R . F A H D N A W A Z
C O - A D V I S O R : D R . I M R A N K H A N
Welding of Ti-5Al-2.5Sn
alloy and its characterization
1
Faculty of Materials and Chemical Engineering
2. Introduction
2
Our work is focused primarily on Grade 6 Titanium
(Ti-5Al-2.5Sn)
Good news: Only in-house testing remains, all
external processes have been carried out
7. Tensile Testing
7
ASTM standard E8M-04 was followed to prepare
the specimens for tensile testing
Gage length: 25mm
Conducted using the 30kN Instron machine
Strain rate: 2.5mm/min
9. Results of tensile testing
9
Max Load
(kN)
Energy at
break
(J)
Extension at
break
(mm)
Teanacity
(kg/den)
1 7.2 8.7 1.75 733
2 7.8 23.6 3.62 792
10. Impact Testing
10
Charpy Impact tests were performed on the samples
As per ASTM standard E-23, a V-notch with an angle
of 60 degrees and a depth of 2mm was used in the
test
12. Notch Tensile testing
12
A specimen with notches of 45 degrees on both sides
as per ASTM standard E-8M-04 was used for this
test
The test was conducted on the Instron tensile testing
machine
14. Results
14
S no. Max Load
(kN)
Energy at
break
(J)
Extension at
break
(mm)
Tenacity
(kg/den)
1 8 4.86 1.00 817.8
2 9.4 6.34 1.12 955.2
15. Microstructural Analysis
15
Grinding was performed on the samples to remove
any scratches
Polishing was then performed on the sample for a
shiny appearance
Kroll solution (6% Nitric acid, 2% Hydrofluoric acid
by volume) was used as an etchant
Further etching was performed using 2% HF in order
to add colors to the microstructure
17. Results summary
17
The microstructure of the heat affected zone changed
from equiaxed grains near the base metal to acicular
structure near the HAZ/FZ interface
The cooling process was unidirectional which
resulted in columnar grains in the HAZ
18. Hole-drill method
18
Performed as per ASTM standard E837
Strain gages are placed at predetermined coordinates
A hole is drilled at specified locations and the
resulting strain produces an electrical signal in the
strain gage
The electrical signal is recorded by a strain recorder
Since strain gages are placed at different coordinates
across the sample, this method gives us the residual
stress distribution
22. References
22
1. Akman, Demir, T. C., and T.S 2009. “Laser Welding of Ti6Al4V Titanium Alloys.” Journal of
Materials Processing Technology 209(8):3705–13.
2. Bhargava P, et al. 2013 “Study on weld bead surface profile and angular distortion in 6 mm thick
butt weld joints of SS304 using fiber laser.” Optics and Lasers in Engineering 47(14):1231–41.
3. Xiao R, Zhang X. 2014. Problems and issues in laser beam welding of aluminum–lithium alloys. J
Manuf Process ;16:166–75.
4. Mats N., Ulf A., Håkan E., and Jukka L. 2015. “Surface Oxidation Behavior of Ti–6Al–4V
Manufactured by Electron Beam Melting (EBM®).” Journal of Manufacturing Processes 17:120–
26.
5. Luo, S.D. and Qian, 2016 “Microwave processing of titanium and titanium alloys for structural,
biomedical and shape memory applications: current status and challenges, Mater.”
Manufacturing Processes 1–15.
6. Khorev, A.I., 2016. “Development of titanium sheet alloys for welded structures working at high
temperatures”, Weld. International. 30:389–394
7. Junaid, M. et al. 2017. “Study of microstructure, mechanical properties and residual stresses in
full penetration electron beam welded Ti-5Al-2.5Sn alloy sheet.” Materials & Design. 139.
.10.1016/j.matdes.2017.11.009.
8. https://www.twmperformance.com/index.php?route=common/home
9. http://www.dsweldingfabrication.com/ds-welding-welding_types.html
