Flash butt welding corrosion of mooring chains

Flash butt welding is a resistance process that offers great advantages due to its high thermal efficiency, simplicity and speed, makes it ideal for mooring chains. Despite advantages, numerous corrosion problems are still being found in practice, both the heat-affected zone weld line. Literature scarce about it, limiting mostly state problem. The majority of studies attribute this preferential local changes microstructure induce galvanic coupling effect.Mooring chain R3 grade steel with along line has been studied from metallographic examinations electrochemical methods. Small differences were base material (mainly composed tempered martensite) but nevertheless, significant respect behaviour. mechanisms discussed particular attention around