Abstract: Mone1400 alloy was surfaced on 16MnR steel with ERNiCu-7 nickel-base alloy welding wire.Chemical composition of different thickness for surfacing layer by gas tungsten arc welding(GTAW), gas metal arc welding(GMAW)and welding combined GTAW with GMAW was analyzed.The diffusion and dilution of basic elements in different metal materials were researched, and bending performance, macrostructure and microstructure of interface were studied.The results show that erosion resistant performance of surfacing layer is excellent when the thickness of surfacing layer welded by combined GTAW with pulse level GMAW is over 2.5 mm.The composition of key elements(Fe, Ni, Cu etc) that affect erosion-resistant performance in surfacing layer accords with the rated alloy composition of ERNiCu-7 alloy welding wire.The side-bending performance is well, surfacing techniques and quality are stable, and surfacing process is efficient.