Effect of Boron Trioxide Enriched Fluxes on the Microstructure and Mechanical Properties in Submerged Arc Welded Mild Steel Plates

Submerged arc welding is the industry’s favoured method for welding thick parts because of its numerous advantages, including high output rates, decent weld efficiency, ease of automation, and low operator ability requirements. The effect of B2O3 additions in fluxes on the microstructure and mechanical properties of the weld metal produced during Submerged Arc Welding of Mild Steel Plates is investigated in this paper. A low carbon electrode was used with five fluxes containing around 2.5, 5, 7.5, 10, and 12.5 percent B2O3. For all of the conditions, the welding process parameters were kept constant. Weld metal for each flux had a microstructure that included acicular ferrite, polygonal ferrite, grain boundary ferrites, and equiaxed pearlite. Vicker’s hardness value was found to be a function of boron content, with a mixed pattern. The increase in boron content in welds increased impact energy and tensile strength, which can be due to the higher acicular ferrite percentage. With 7.5 percent and 5% of B2O3, respectively, an optimal degree of toughness and tensile strength was achieved. Fresh flux was also compared qualitatively using full metallography and mechanical testing.

Author (s) Details

Pushpendra Gupta
Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, India.

Joydeep Roy
Department of Mechanical Engineering, National Institute of Technology Agartala, India.

S. C. Saha
Department of Mechanical Engineering, National Institute of Technology Agartala, India (Retd.).

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