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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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