Develop a flux cored wire for submerged arc welding of Ni-Mo low alloy steel

• Published in: Sadhana (Bangalore) Vol. 45; no. 1
• Main Authors: Patel, Dixit, Soman, S N
• Format: Journal Article
• Language: English
• Published: New Delhi Springer India 01.12.2020; Springer Nature B.V
• Subjects: Alloying elements; Basicity; Chemical composition; Engineering; Flux cored wires; High strength; Low alloy steels; Mechanical properties; Molybdenum; Nickel; Submarines; Submerged arc welding; Subzero temperature; Weld metal; Welding fluxes; Wire; Wire drawing; Submerged arc welding; Ni-Mo low alloy steel; flux basicity; element transfer
• ISSN: 0256-2499; 0973-7677
• DOI: 10.1007/s12046-020-01362-w

Ni-Mo low alloy steel exhibits an admirable amalgamation of high strength and toughness at subzero temperature and show resistance to brittle fracture with good weldability. This steel has been established to fulfill the needs of specific applications, such as the construction of ships and submarines. To develop a companionable wire for welding of Ni-Mo low alloy steel, the amount of the alloying elements in a wire is increased to toughen of weld metal, the wire itself has high strength so that the wire is hardened at the wire drawing, making the wire production difficult. In order to avoid the problems related to the solid wires, various flux cored wires have been developed. In this work, the effect of flux basicity index and heat input on chemical composition, oxygen-nitrogen analysis, mechanical properties and microstructure of Ni-Mo low alloy steel welded by SAW welding using flux cored wires are presented along with the effect of flux cored wire and basicity index on deposition rate.