Milton,
Welding Cadmium is not at all like welding galvanized from a safety standpoint.
Cad has a much higher toxicity potential than zinc/galvanized products...
Special precautions must be made for welding, grinding etc.
Cadmium contamination can kill!
Here is an AWS fact sheet that has good data plus a long list of references at the end.
http://files.aws.org/technical/facts/FACT-22.PDF