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Welding Zinc Plated Steel. Zinc will not produce sparks when grinding and it is hard to tell the zinc from the metal sometimes after grinding. The zinc around the weld and the Chromate coating for a greater distance from the weld will be destroyed.
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If it is just small tack welding you shouldnt have any problems. The zinc around the weld and the Chromate coating for a greater distance from the weld will be destroyed. In addition the residuals left after welding on the surface of the plate can affect the corrosion resistance by interfering with the coating.
An electric resistance welding method for welding zinc plated steel plates 7 is disclosed.
The sure fire way to know you have removed the the zinc is when you see sparks. Other than that it is just plain better to clean the coating than to have to breathe the fumes from welding the coatings. In addition the residuals left after welding on the surface of the plate can affect the corrosion resistance by interfering with the coating. Three major problems with welding zinc coated steels are high spatter amount poor bead appearance and high internal porosities.
