Abstract
Objectives: The investigation was done with the aim of studying the influence of basicity index on mechanical properties of the structural steel. Methods/Statistical Analysis: In this experiment, influence of Basicity index on the welding characteristics was analyzed in the submerged arc welding by keeping all other variables like current, voltage and welding speed constant. The effects of wire/flux (Basicity index) on ultimate tensile strength, Microstructure and impact strength of the weld metal was investigated. Weld deposits on structural steel plates were made at different flux composition. In these experiment plates of dimension 14x125x250 mm was used for welding. The specimens were cut out from the welded plate to carry out various tests after performing the saw operation. Five different types of fluxes were used to weld the plates. Findings: The impact toughness values at room temperature increases with increase in basicity index of flux and highest micro hardness values are formed at the Heat Affected Zone (HAZ) regions for welded specimens. Keywords: Dissimilar Metals, Steel, Welding
Highlights
Structural steel is the preferred materials for the structural engineering as well as manufacturing of pipeline tanks, railroad cars, and ship construction etc
To take vantage of the developments in Structural steel metals, welding flux which reduces the effects of hydrogen induced cracking and develop rugged microstructures must be developed
Increase in deposition rates achieved by increasing the welding current which tends to make worse joint toughness
Summary
Structural steel is the preferred materials for the structural engineering as well as manufacturing of pipeline tanks, railroad cars, and ship construction etc. The welding fluxes for these steels are commercially available but the flux compositions are patented and are not widely reported in literature. In the present work flux was developed with the help of the available literature for joining of structural steel. To take vantage of the developments in Structural steel metals, welding flux which reduces the effects of hydrogen induced cracking and develop rugged microstructures must be developed. Increase in deposition rates achieved by increasing the welding current which tends to make worse joint toughness. In3 while discussing the influence of welding parameters on mechanical behaviour of ferrous metals, said that a number of determined parameters in SAW influence microstructure, bead geometry and weld chemistry. Some researchers realized that the mechanical properties of weld are influenced by the composition of the base metal and to a large extent by the weld bead geometry and shape relationship as well.
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