Abstract
Three experimental flux cored wires(basic type) designed to produce systematic variations in the concentrations of boron of 32 ppm, 60 ppm and 103 ppm in the weld metal were prepared. A previous study of crack properties, morphology and microstructure in accordance with welding conditions was published in Welding Journal(Lee, 2006). Microstructure, strength and absorbed energy were studied for EH32 TMCP (Thermo-Mechanical Controlled Process) 40 mm thick plate welded with a gas-shielded flux cored arc welding.
The volume fraction of acicular ferrite decreased with increasing boron contents 32 to 103 ppm. The upper bainite instead of acicular ferrite was formed in the 103 ppm boron weld metal. The hardness values welded with 32 ppm and 60 ppm boron wire welds were in the range of Hv 190–210, while those welded with 103 ppm boron wire weld were in the range of Hv 230–235.
The absorbed energy slightly decreased with increasing boron contents from 32 ppm to 60 ppm, but significantly decreased with increasing boron contents from 60 ppm to 103 ppm. In the weld joint welded with 32 ppm and 60 ppm boron content electrode, no cracks were detected. However, cracks were detected the specimen welded with 103 ppm boron content electrode.
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Lee, H.W., Kim, Y.H., Lee, S.H. et al. Effect of boron contents on weldability in high strength steel. J Mech Sci Technol 21, 771–777 (2007). https://doi.org/10.1007/BF02916355
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DOI: https://doi.org/10.1007/BF02916355