Yes. Stainless and carbon steels can be welded together. It is important to use a filler metal that is appropriate for the stainless steel. It is important to note that galvanic corrosion may be a problem if there is an electrolyte (moisture) present on a regular basis that will connect the two metals at this welded joint. Appropriate steps, such as applying a protective coating, should be taken to prevent moisture from bridging the metals and causing selective corrosion at the welded joint. It is important to note that, if the carbon steel has been galvanized, the coating must be completely removed from the surface prior to welding or zinc embrittlement could occur.