I once worked for a company called RC Technical Welding & Fabrication, and a guy there called Raul Cardona (he's the President) but can weld anything to anything. Have a chat with him at 281-933-6004
needs PWHT . You havnt said if its pipe or if its new or old ...the new grades have different welding requirements they have vanadium in them and can be trickier
See the website for NIDI. It has a lot of information on 9% Ni steel welding. Also get in touch with Esab/Lincoln. They have specialized consumables of the type NiCrMo6 for weldoing these alloys.
Also see thread
thread725-50235
Thanks and regards
Sayee Prasad R
Ph: 0097143968906
Mob: 00971507682668
End of all knowledge is the attainment of immortality!