A good place to start for info on welding 9% Nickel would be to visit the Nickel Development institute - NIdi .(they have a website www.Nidi.org) They have lots of free tecnical literature that you can request and also you can speak with one of their consultants, and its all for free, no charge.
Good luck and let us know how it turns out.
Colin
Try INCO ALLOWS web site. Thats there stock and trade.
Let me correct you, Ron, it's INCO ALLOYS, not ALLOWS.
Giovanni S. Crisi
OOPs. But I am sure they allow you get information.
OK, I get it now! :) Allows! :) I'm sorta slow sometimes. I like the pun there Ron
John Wright
Here is an informative site from Bethlehem/Lukens
http://www.bethsteel.com/customers/pdfs/nickel.pdf
NIDI has a lot of free material (right from the early development of consumables and welding of 9% Ni steels). Early days saw the usage of austenitic ss consumables like E309 and then it moved into usage of Ni alloys like E/ERNiCrMo3 and the recent trend especially for the LNG 6tankages is to use E/ERNiCrMo6. Esab also has a good bit of technical data on the welding of these steels.