Though about a ferretic metengr, and actually it's perfect for the app.(Boiler Casing)
The problem is I am uncertain about a 387 to , say 409 weld.
We would need to "field" weld around 700 linear ft of 409 to 387.
This is a 1/8" seal weld.
Would probably need to use a 309 or 309L rod, and I...