AMS Grade Cobalt Alloy Filler Metal – Corrosion and Heat Resistant Cobalt welding alloy in welding wire, welding rod, and stick form. Certified to Aerospace Material Specification. Product NameAMS WT 4140VM6452 WT 4340 6456 WT 41306457 WT 17-226458 WT 12126459 WT 61306461 6462 WT 5026466 WT 9-4-20 6468