Analisis Penggunaan Nickel-Based Elektrode dan Heat Input pada Pengelasan Material Hastelloy-30 Terhadap Nilai Kekerasan dan Struktur Mikro

Abstract

Storage tanks in the petrochemical industry are commonly made of steel; however, their susceptibility to corrosion in corrosive environments poses significant challenges. One solution is to use nickel-based alloys such as Hastelloy G-30, which is known for its excellent corrosion resistance to aggressive chemicals like sulfuric acid and hydrochloric acid. This study evaluates the effects of using nickel-based electrodes, ENiCrMo-11 and ENiCrMo-13, as well as variations in heat input during welding, on the hardness, and microstructure of Hastelloy G-30 material. Hardness tests revealed that specimen A1, welded with the ENiCrMo-13 electrode at low heat input, achieved the highest hardness in the weld metal, measuring 236.11 kgf/mm², whereas specimen B2, welded with the ENiCrMo-11 electrode at high heat input, had the lowest hardness in the heat-affected zone (HAZ) at 187.63 kgf/mm². The microstructure analysis showed variations, with columnar dendrites forming in all specimens and equiaxed dendrites observed in those with high heat input.