Cold overlaying by MMA and GMA methods of defects in spheroidal-iron castings by means of flux-core wires

Abstract

Depending on the composition of the material, the enamelling process is carried out at temperatures of between 500 and 900 °C. The layer of enamel, in addition to its aesthetic value (the possibility of producing films of a chosen colour), also guarantees the acquisition of working properties such as, for instance, resistance – particularly at elevated temperatures – to corrosive action of acids and alkaline compounds, resistance to thermal shocks, atmospheric corrosion, ultraviolet and infrared radiations, electric resistivity, etc. More and more often, manufacturers of cast fabrications require the surfaces of castings to be protected by enamel coatings.^1,2