Welding Galvanized Coated Steel. Zinc turns to vapors at a relatively lower temperature and when you are welding on galvanized steel it can cause toxic fumes which can be very harmful to your health. Positive ventilation involves the use of a suction hose at the weld area.
The best way to weld galvanized steel regardless of welding process is to remove the zinc coating from the joint. As a result the unprotected bare weld could suffer from expedient weld failure. The resultant fumes which can cause metal fume fever.
This adds two operations.
Another one of the challenges of welding galvanized steel is that zinc coatings can make it impossible to do a clean weld interfere with fusion and lead to porosity and inclusions. Proper precaution is needed when handling these coated metals as their fumes can lead to serious conditions like the Metal Fume Fever. If corrosion resistance is still required after welding a post-weld process must be used such as painting the material or re-galvanizing. Welding of galvanized steel is done almost exactly the same way as welding of the bare steel of the same composition.