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Experimental Study of Tungsten Inert Gas Pulsed Welding Applied to Ni-Ti Shape Memory Alloy Wires

Published online by Cambridge University Press:  01 October 2015

Luiz F.A. Rodrigues ,
Fernando A. Amorim ,
Francisco F.R. Pereira  and
Carlos J. de Araújo
Luiz F.A. Rodrigues
Affiliation:
Federal Institute of Education, Science and Technology of Paraiba (IFPB), Av. Tranquilino Coelho Lemos, 671, Dinamérica, CEP: 58432-300, Campina Grande – PB, Brazil Federal University of Campina Grande (UFCG), Av. Aprígio Veloso, 882, Universitário, CEP: 58429-140, Brazil.
Fernando A. Amorim
Affiliation:
Federal University of Campina Grande (UFCG), Av. Aprígio Veloso, 882, Universitário, CEP: 58429-140, Brazil.
Francisco F.R. Pereira
Affiliation:
Federal University of Campina Grande (UFCG), Av. Aprígio Veloso, 882, Universitário, CEP: 58429-140, Brazil.
Carlos J. de Araújo
Affiliation:
Federal University of Campina Grande (UFCG), Av. Aprígio Veloso, 882, Universitário, CEP: 58429-140, Brazil.
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Abstract

Shape memory alloys are functional materials that can recover plastic strains between 2 and 6%. This property can be used to produce actuators for many areas as medicine, robotic, aeronautic and others. Recently, it has been observed the particular interest for shape memory alloys welding, especially to obtain Ni-Ti similar and dissimilar joints and fabricate simple or complex structures. In this sense, this work present an experimental study of tungsten inert gas pulsed welding applied to Ni-Ti shape memory alloy wires with 0.9 mm in diameter, previously heat treated at 450 °C for 20 minutes and air cooled. For that, it was carried out tensile tests at isothermal temperatures from 40 °C to 90 °C (steps of 10 °C) for welded and unwelded wires. The transformation temperatures obtained from differential scanning calorimetry were compared to verify the effect of welding process. It was also performed a stabilization process by mechanical cycling in some welded and unwelded Ni-Ti wires. The results showed a low strength and strain capacity of the weld joint at higher temperatures. Although, at lowest temperature, close to 40 °C, it was observed higher values of maximum stress and strain for welded Ni-Ti wires.

Keywords

actuatorweldingstress/strain relationship
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1765: Symposium 4A – Advanced Structural Materials—2014 , 2015 , pp. 153 - 158
Copyright
Copyright © Materials Research Society 2015 

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References

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