Nickel electrodeNickel and nickel alloy electrode can be divided into five categories, namely commercially pure Ni, Ni-Cu, Ni-Cr-Fe, Ni-Mo and Ni-Cr-Mo. Each class can be divided into one or more types of electrodes. These Nickel Alloy Welding Electrodes electrodes are mainly used for welding nickel or high nickel alloys, and sometimes also be used for dissimilar metal welding or surfacing.