Accordingly, the present invention provides a weld filler composition for
joining different alloy steel pieces with substantially different
chromium content, such as joining low alloy ferritic steel to high alloy
ferritic steel, low alloy ferritic steel to austenitic stainless steel,
or high alloy ferritic steel to austenitic stainless steel, and a method
using the same. In one embodiment, the present invention provides a
composition for a weld filler comprising nickel, iron, and chromium,
which collectively comprise at least 50% by weight of the weld filler;
niobium, carbon, manganese, molybdenum, and silicon, which collectively
comprise no more than 50% by weight of the weld filler, and a niobium to
carbon ratio of approximately 20 or less.