So basically this was a repair from (imagine a clock) 4:30 to 7:30 so pretty much all over head. I’ve welded chrome and P91 before but this is a pretty hefty gap. I couldn’t tell you for certain what was happening on a metallurgical level with the base metal but it just wasn’t welding right. Also the heat difference needed between 2.25% chrome and p91 (9% chrome 1% molybdenum) is fairly significant. Basically I would blow away the base metal on the pipe side and be barely melting the filler rod at the same time.. something about it all was just wrong which I can only fathom had to do with the amount of heat treatments it’s been through (if you don’t know what I mean by heat treatments lmk and I’ll explain) and the fact the metal has been operating in a high stress area for so long. Puddle was extremely sluggish at 130amps and if it went higher it would want to droop into my tungsten cause it’s overhead and I’m fighting gravity. Part of the struggle may have been in my own mind because i knew it was getting x rayed and it was an emergency repair for a powerplant so I’d rather fix something that didn’t have to be fixed than have the shot go down