Had this idea a couple of days ago and had to give it a try. To put stainless steel weld on a high carbon blade for decorative purposes. Think it actually turned out pretty well.
It all started as an old file annealed to start with, cut a piece off the end.
Built up a bit of stainless steel weld with the mig welder, not pretty, think another time i would grind the file flat first but thought it would make a better pattern with the ribs left on, just made a dirty weld as it was not clean.
Next, grind weld flat and rough out a shape. All done with angle grinder.