I see that this post has been unanswered for some time. I certainly have such info in hard copy, but do not know of a specific website that has such a list. If you give me your e-mail address, I will try to scan in what I have and e-mail it.
This type of info is certainly available from the suppliers of "specialist" welding consumables. They are usually quite happy to give this to you if you ask them.
If you want more generalized guidelines on the welding of dissimilar metals, you can download a paper and associated spreadsheet from the proknownet website that deals with these issues. Proceed as follows:
1)Go to www.proknownet.com
2)Click on the "Papers" link in the LHS frame
3)Click on "search for papers"
4)Place "pap-WQMXM" in the keyword 1 box and submit.
To get the spreadsheet, proceed as follows:
1)Go to www.proknownet.com
2)Click on the "Software" link in the LHS frame.
3)Click on "Search for Software"
4)Place "Weld" in the keyword 1 box and submit.
While the paper is rather aimed at corrosion resistant weld overlays, the principles are the same when joining dissimilar metals.
Hope this helps
Regards
Niekie Jooste