Hi Tito
You can certainly use ASME IX to qualify your corrosion resistand overly welding procedure. It will however not give you any guidance on how to perform the actual weld. It will merely give you information on what the test piece must look like, the tests to perform and the qualified ranges for your test.
What info are you looking for? The welding info, or the test piece info?
Follow the following link to see a paper dealing with calculations for weld overlays:
http://www.proknownet.com/paperviewframe.asp?docid=*pap-WQMXM&next=search
In addition, a spreadsheet can be downloaded to perform these calculations by following the link:
www.proknownet.com/software/sw-AKSUE.exe
I hope this is the information you had in mind.
Regards
Niekie Jooste