The industrial nickel alloy N6 was experimentally studied by Plasma arc welding with filler wire and without filler wire process. The effects of welding on microstructure, hardness, electricity, corrosion resistance and electrical conductivity of nickel alloy N6 were investigated by microstructure observation、XRD analysis、hardness、corrosion weight loss and resistivity testing.The results showed that the effects of welding procedure on corrosion resistance and electrical conductivity.The corrosion resistance of the weld with filler wire and without filler wire deceased compared with the base metal. The corrosion rate and resistivity of welded joints without filler wire is larger than that welded joints with filler wire. The corrosion resistance of the base metal and welded metal is mainly dependent on microstructure, hardness and inclusions；The resistivity is associated with such factors as grain size and inclusions.