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Abstract
In this study, the protection mechanism of four typical anti-spatter products based on polymer coating is investigated. These coatings protect the weld nozzle against weld spatter in a similar way as water droplets on a hot plate. During the short contact of the molten metal droplet with the coating, part of the coating evaporates in the form of carbon monoxide, hydrogen, water and other volatile degradation products. During welding, these gases act as a buffer layer between the coating and the weld spatter and can significantly reduce the potential spatter/substrate adherence and spatter agglomeration.