Experimental Study of Microstructure and Mechanical Properties of Gray Cast Iron Welded Joint Using Est and Nickel Electrode

Author(s)	Dr. Md Salim Ansari
Country	India
Abstract	Gray cast iron is the most prominently used material in industry. Many times, repair of the cast products is required to save production cost. Welding is very frequently used to repair gray cast iron components. The weldability of gray cast iron is always considered to be poor. The formation of martensite after cooling resulting in cracks is the main concern. In this work weldability of gray cast iron was investigated by using ESt electrode and ENiFe-CI electrode. Measurement of hardness and impact tests was conducted to study the quality of welded joints. Microstructural observations were also done in as-welded and PWHT conditions. In the case of welding with a nickel electrode, the microstructure of various zones i.e. fusion zone, HAZ and base metal in as-welded condition, shows austenite matrix, martensite, and flakes of graphite, respectively. In the case of a steel electrode in as-welded condition, the fusion zone, HAZ and base metal exhibit two phases of ferrite, martensite, and flakes of graphite, respectively. After applying PWHT martensite and carbide present in the phase were dissolved, and they were converted into ferrite and graphite, consequently reducing the hardness of the weldment.
Keywords	Gray cast iron, Microstructure, Post weld heat treatment, Hardness, Toughness.
Field	Engineering
Published In	Volume 8, Issue 2, March-April 2026
Published On	2026-03-16

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