51. Influence of Heat Input on Corrosion Resistance of Duplex Stainless Steel Cladding on Low-Alloy Steel by FCAW

Cladding is a popular surfacing process in which deposition of corrosion-resistant material on corrosion-prone structural steel is done to enhance the service life of different devices even under severe corroding atmosphere. Flux-cored arc welding is a successful process adopted for cladding. Duplex stainless steel is becoming an efficient cladding material in chloride atmosphere. Heat input is an important parameter for cladding process. In the present experiment, three sets of heat input are chosen by changing welding current and welding voltage, keeping voltage constant. Each set of heat input is constructed by three levels of current and voltage. Duplex stainless steel cladding is performed in a single layer with 50% overlap on low-alloy steel by flux-cored arc welding using 100% CO₂ as shielding gas. Metallography tests, corrosion test along with evaluation of chemical composition of clad samples have been performed. Theoretical values of chromium equivalent, nickel equivalent, ferrite number, and pitting corrosion equivalent number (PREN) obtained from chemical composition of clad samples suggest that Cr_eq, Ni_eq, ferrite number, and PREN (Pitting Corrosion Equivalent Number) do not change significantly with an increase in heat input. Corrosion rate increases with an increase in heat input within the experimental domain.