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Investigation on Low Cycle Fatigue of Micro Plasma Arc Welded Titanium (Ti-6Al-4V) Alloy

A. Sunny Kumar, T.V. Hanumantha Rao, V. V. S. Kesava Rao


In the present study, Titanium (Ti-6Al-4V) alloy sheets of 0.5mm thick are square butt welded using pulsed current micro plasma arc welding. Low cycle fatigue test is done under tension-tension mode using controlled servo hydraulic fatigue testing system (INSTRON, Model No: 8801). Sinusoidal loading is applied varying from 0.6KN to 6KN and keeping stress ratio at 0.1. Fatigue life of the welded joint at different frequencies (5Hz, 10Hz, 15Hz & 20 Hz) are studied. Scanning electron microscope images are analyzed at the failure regions and observed that plastic deformation is narrow for 5Hz and 10Hz, where as it is broad for 15Hz and 20Hz frequency. It is understood that fatigue life of welded joint increase with increase in frequency from 5Hz to 20 Hz.


fatigue life;micro plasma,;arc welding; titanium

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Maddox SJ. Fatigue Strength of Welded Structures. Nashville: Abington Publishing; 1991.

Nurdin Ali, Mustapa MS, Ghazali MI, Sujitno T, Ridha M. Fatigue life prediction of commercially pure titanium after nitrogen ion implantation. International Journal of Automotive and Mechanical Engineering. 2013; 7: 1005−1013p.

Balasubramanian TS, Balasubramanian V, Muthumanikkam MA. Effect of welding processes on fatigue properties of Ti-6Al-4V alloy joints. World Academy of Science, Engineering and Technology International Journal of Mechanical and Mechatronics Engineering. 2011; 5 (2): 427−436p.

Anil Kumar Nag, Praveen KVU, Vakil Singh. Low cycle fatigue behavior of Ti–6Al–5Zr–05Mo–025Si alloy at room temperature. Indian Academy of Sciences, Bull Mater Sci. 2006; 29 (3): 271–275p.

Nikolas Hrabea. Fatigue properties of a titanium alloy Ti-6Al-4V fabricated via electron beam melting EBM: effects of internal defects and residual stress. National Institute of Standards and Technology, International Journal of Fatigue. 2017; 94: 202−210p.

Shizhu Xing, Pingsha Dong. Fatigue of titanium weldments: S-N testing and analysis for data transferability among different joint types, a welded structures laboratory. Marine Structures. 2017; 53: 1−19p.

Yang Moucuna, Nie Hong. Analysis approach to durability based on material initial fatigue quality and S-N curve. Chinese Journal of Aeronautics. 2007; 20: 518−523p.

Sunny Kumar A, Hanumantha Rao TV, Kesava Rao VVS. Optimizing Fatigue Life of Micro Plasma Arc Welded Titanium (Ti-6Al-4V) Alloy using Grey Relational Analysis. Journal of Mechanical and Mechanics Engineering. 2018; 4 (3): 1−11p.



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