Aerospace Material Specification is nickel alloy in welding wire, welding rod, powder, and paste. Typically used for joining nonferrous alloys and corrosion resistant alloys for low flow point and good corrosion and oxidation resistance.
Ni: 82% | Si: 4.5% | Cr: 7% | B: 3.1% | Fe: 3%
Further reading: AMS 4775 Nickel Alloy.
Further reading: BNi-1a nickel alloy brazing filler.