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Metals 2016, 6(11), 283; doi:10.3390/met6110283

An Analysis of the Weldability of Ductile Cast Iron Using Inconel 625 for the Root Weld and Electrodes Coated in 97.6% Nickel for the Filler Welds

ITM, Universitat Politècnica de València, Valencia 46022, Spain
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Academic Editor: Giuseppe Casalino
Received: 26 July 2016 / Revised: 5 November 2016 / Accepted: 14 November 2016 / Published: 18 November 2016
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Abstract

This article examines the weldability of ductile cast iron when the root weld is applied with a tungsten inert gas (TIG) welding process employing an Inconel 625 source rod, and when the filler welds are applied with electrodes coated with 97.6% Ni. The welds were performed on ductile cast iron specimen test plates sized 300 mm × 90 mm × 10 mm with edges tapered at angles of 60°. The plates were subjected to two heat treatments. This article analyzes the influence on weldability of the various types of electrodes and the effect of preheat treatments. Finally, a microstructure analysis is made of the material next to the weld in the metal-weld interface and in the weld itself. The microstructure produced is correlated with the strength of the welds. We treat an alloy with 97.6% Ni, which prevents the formation of carbides. With a heat treatment at 900 °C and 97.6% Ni, there is a dissolution of all carbides, forming nodules in ferritic matrix graphite. View Full-Text
Keywords: weldability; pre-heating; ductile cast iron; microstructure; root pass weldability; pre-heating; ductile cast iron; microstructure; root pass
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Cárcel-Carrasco, F.-J.; Pérez-Puig, M.-A.; Pascual-Guillamón, M.; Pascual-Martínez, R. An Analysis of the Weldability of Ductile Cast Iron Using Inconel 625 for the Root Weld and Electrodes Coated in 97.6% Nickel for the Filler Welds. Metals 2016, 6, 283.

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