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Graphitized Microstructural State
A state of iron-carbon casting alloys in which carbon is wholly or partially present in elemental form as graphite. This reduces brittleness compared to purely cementitic microstructures.
Carbon is present in cast iron as graphite, depending on the alloy and cooling. The structure determines whether you're dealing with gray or white cast iron. When welding, you heat locally and intensely, which can change the structure and create hard, brittle zones. If you cool the part too quickly afterwards, it will crack. You need to control the heat input and let it cool slowly, otherwise you'll have trouble with machinability.
MetallurgieSchweißtechnik