Evaluation of the Corrosion Resistant Weld Cladding Deposited by the TIG Cold Wire Feed Process

Abstract:

The aim of this study is to evaluate the microstructure and properties, resulting from the dissimilar welding of Ni-based alloys like Hastelloy C276 and Inconel 625 with ASTM A516 Gr 60 steel, through the deposition of overlays by the TIG welding process with cold wire feed. The results showed that it is feasible to produce coatings with low dilution levels in a single layer. Regarding the microstructure, there was a strong segregation of alloying elements during solidification. The phenomenon of microsegregation is directly or indirectly associated with the mechanism of corrosion attack. The shear resistance tests showed that coalescence between coating and substrate, provided a high shear strength, even with the possible presence of defects and high hardness martensitic zones. The immersion test in FeCl3 showed that the alloy 625 had lower CPT when compared to alloy C276. However, in the CPT temperature for the alloy C276, the intensity of the attack for the alloy 625 was lower than the alloy C276.

• Periodical: Materials Science Forum (Volumes 783-786)
• Pages: 2822-2827
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.783-786.2822
• Online since: May 2014
• Authors: Cleiton Carvalho Silva*, Conrado Ramos Moreira Afonso, Antonio Jose Ramirez, Marcelo Ferreira Motta, Hélio Cordeiro de Miranda, Jesualdo Pereira Farias
• Keywords: Corrosion, Hardness, Hastelloy C246, Inconel 625, Microstructure, Overlay, Welding

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