I did lay down a TIG bead of mild steel filler rod on the side of a junk
rotor. I was trying to determine if I could fill in some volume in the combustion
chambers.

I then beat the daylights out of the weld area, and used a chisel on the bead
trying to make it fail. It held fine.

Welding them up might work. Not a very hard material, and easy to damage the
fine detail areas around the corner seal holes. They are cast of (not quite
steel) a free machining something or other. You could have the metallurgy done,
and then tell us what it is.

Lynn E. Hanover