Zone wise local characterization of welds using digital image correlation technique

Saranath, K M and Sharma, Abhay and M, Ramji (2014) Zone wise local characterization of welds using digital image correlation technique. Optics and Lasers in Engineering, 63. pp. 30-42. ISSN 0143-8166

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The process of welding is associated with high and varying thermal gradients across the weld, resulting in inhomogeneous material properties surrounding the weldment A proper understanding of the varying mechanical properties of the weld and surrounding materials is important in designing and modelling of components with weld. In the present study the characterization of different zones such as fusion zone, heat affected zones and unaffected base material of a deposited weld is carried out using digital image correlation (DIC) technique. A methodology using the micrographic observation and image processing is proposed for accurate identification of various weld zones. The response of welded samples in the elastic and plastic region is compared with the virgin sample. Full range stress-strain curves are obtained for each zone using the whole field strain measurement involving DIC. The parameters investigated are Young's modulus, Poisson's ratio, yield stress, strain hardening exponent and strength coefficient. A study regarding the variation of properties with respect to varying weld currents of 100 A, 130 A and 150 A is carried out. The Vickers microhardness measurement is also conducted to obtain the variation in hardness across weldment. Fusion zone of all the welded samples have reported lower Young's modulus and higher yield strength compared to virgin samples. The Vickers hardness values obtained for fusion and heat affected zones are in line with the yield stress variation obtained zone wise.

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Item Type: Article
Additional Information: The authors wish to thank Mr. Moulali Syed and Mr. Dhananjay Sahoo, Manufacturing Lab, IIT Hyderabad for helping us in preparing the tensile specimens. Also we would like to thank Mr. Naresh Reddy Kolanu, M Tech student, Engineering Optics Lab, IIT Hyderabad, for assisting in conducting tensile testing.
Uncontrolled Keywords: Constitutive parameters; Digital image correlation; Heat affected zone; Strain hardening; Weld deposition
Subjects: ?? sub4.9 ??
Materials Engineering > Materials engineering
Divisions: Department of Physics
Depositing User: Team Library
Date Deposited: 27 May 2015 09:51
Last Modified: 21 Jun 2018 11:54
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