Characterization Hard Surfacing of Cr-Nb-Ni-Fe based and Cr-Mo-W-Fe based Cored Wires Fabricated by Gas Metal Arc Welding
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In this research, the weldments of Cr-Nb-Ni-Fe based and Cr-Mo-W-Fe based electrode cored wires were fabricated onto low carbon steel by gas metal arc welding. The Cr-Nb-Ni-based electrodes cored wire consisting of iron, chromium and nickel alloy shell and iron, niobium, boron and aluminum alloy as the core material. Meanwhile, the Cr-Mo-W-Fe based electrode cored wire containing the iron and chromium alloy shell and a molybdenum, tungsten and carbon alloy as the core component. The measurement of average microhardness on the weldment Cr-Mo-W-Fe based was 1007 HV300g which was higher than that of the Cr-Nb-Ni-Fe based. This was due to a well distribution of the molybdenum and tungsten carbide in the Cr-Mo-W-Fe weldment. Whereas the Cr-Nb-Ni-Fe based weldment showed a distribution of niobium providing the average hardness of 656 HV300g which was about 3 times that of a mild steel substrate. Moreover, it was also found that very low dilutions between the cored wire and substrate resulting in high hardness and consistently in weldment.