Bead-on-plate with oscillation GTAW was carried out with an electric power supply using an auto-mechanized system in which the welding torch was moved back and forth at a constant speed above the alloy filler. A gas tungsten arc was used to melt the substrate and alloy filler. Fig. 1 shows the schematic illustration of the GTAW process and the analysis positions of the microstructure observation and wear test. The welding parameters are listed in Table 2.