Thanks guys, I was referring to HSS, high speed steel, used in cutting tools and tool bits. Twist drills, milling machines, lathes etc. I know it can withstand high temps which makes it superior to high carbon steel for cutting metals but I don't know how this affects it's weld-ability. I want to shape a tool bit similar to the bottom of the seal groove then attach it to a boring bar in a bar head and turn it to re-machine my seal groove. If it can be welded it will save me the effort to design another attachment method.
