Fatigue assessment of Ti-6Al-4V titanium alloy laser welded joints in absence of filler material by means of full-field techniques
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http://orcid.org/0000-0003-0319-048X
Vincenzo Crupi
University of Messina, Italy
http://orcid.org/0000-0001-7498-4733
Eugenio Guglielmino
University of Messina, Italy
http://orcid.org/0000-0001-7793-7406
Carmine Maletta
University of Calabria, Italy
http://orcid.org/0000-0002-9204-5358
Emanuele Sgambitterra
University of Calabria, Italy
http://orcid.org/0000-0001-5593-399X
Giuseppe Barbieri
Centro Ricerche ENEA Casaccia – Rome, Italy
http://orcid.org/0000-0001-5583-8634
Fabrizia Caiazzo
University of Salerno, Italy
Abstract
The aim of this research activity was to study the fatigue behavior of laser welded joints of titanium alloy, in which the welding was performed using a laser source and in the absence of filler material, by means of unconventional full field techniques: Digital Image Correlation (DIC), and Infrared Thermography (IRT). The DIC technique allowed evaluating the strain gradients around the welded zone. The IRT technique allowed analyzing the thermal evolution of the welded surface during all the fatigue tests. The fatigue limit estimated using the Thermographic Method corresponds with good approximation to the value obtained from the experimental fatigue tests. The obtained results provided useful information for the development of methods and models to predict the fatigue behavior of welded T-joints in titanium alloy.
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