Hexavalent Chromium (aka; chrome 6 or hex chrome) is the bad chrome and it's fumes are what you should worry about. That being said, "Hex Chrome" is not the major type of chrome found in Stainless Steel or in the fumes created in the welding process. If you really want to know about the potential dangers you need to read up on Chromium and the many different forms it is found in. Beware that you may also might learn the difference between a vapor and a fume.
"I couldn't wait for success, so I went ahead without it."