Abstract
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 3 times that of a mild steel substrate. Additionally, it was also found that the between cored wire and substrate was very low dilutions resulting in high hardness and homogeneous weldment.
Keywords: Hard surfacing, Cored wire, Sliding wear, Gas metal arc welding
